/* Target-dependent code for GDB, the GNU debugger.
- Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "arch-utils.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "objfiles.h"
-#include "tm.h"
-#include "../bfd/bfd.h"
#include "floatformat.h"
#include "regcache.h"
+#include "trad-frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "dwarf2-frame.h"
#include "reggroups.h"
#include "regset.h"
#include "value.h"
#include "gdb_assert.h"
#include "dis-asm.h"
+#include "solib-svr4.h"
+#include "prologue-value.h"
#include "s390-tdep.h"
+#include "features/s390-linux32.c"
+#include "features/s390-linux64.c"
+#include "features/s390x-linux64.c"
+
/* The tdep structure. */
struct gdbarch_tdep
{
+ /* ABI version. */
+ enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
+
+ /* Pseudo register numbers. */
+ int gpr_full_regnum;
+ int pc_regnum;
+ int cc_regnum;
+
/* Core file register sets. */
const struct regset *gregset;
int sizeof_gregset;
};
-/* Register information. */
-
-struct s390_register_info
-{
- char *name;
- struct type **type;
-};
+/* ABI call-saved register information. */
-static struct s390_register_info s390_register_info[S390_NUM_TOTAL_REGS] =
+static int
+s390_register_call_saved (struct gdbarch *gdbarch, int regnum)
{
- /* Program Status Word. */
- { "pswm", &builtin_type_long },
- { "pswa", &builtin_type_long },
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* General Purpose Registers. */
- { "r0", &builtin_type_long },
- { "r1", &builtin_type_long },
- { "r2", &builtin_type_long },
- { "r3", &builtin_type_long },
- { "r4", &builtin_type_long },
- { "r5", &builtin_type_long },
- { "r6", &builtin_type_long },
- { "r7", &builtin_type_long },
- { "r8", &builtin_type_long },
- { "r9", &builtin_type_long },
- { "r10", &builtin_type_long },
- { "r11", &builtin_type_long },
- { "r12", &builtin_type_long },
- { "r13", &builtin_type_long },
- { "r14", &builtin_type_long },
- { "r15", &builtin_type_long },
+ switch (tdep->abi)
+ {
+ case ABI_LINUX_S390:
+ if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+ || regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM
+ || regnum == S390_A0_REGNUM)
+ return 1;
- /* Access Registers. */
- { "acr0", &builtin_type_int },
- { "acr1", &builtin_type_int },
- { "acr2", &builtin_type_int },
- { "acr3", &builtin_type_int },
- { "acr4", &builtin_type_int },
- { "acr5", &builtin_type_int },
- { "acr6", &builtin_type_int },
- { "acr7", &builtin_type_int },
- { "acr8", &builtin_type_int },
- { "acr9", &builtin_type_int },
- { "acr10", &builtin_type_int },
- { "acr11", &builtin_type_int },
- { "acr12", &builtin_type_int },
- { "acr13", &builtin_type_int },
- { "acr14", &builtin_type_int },
- { "acr15", &builtin_type_int },
+ break;
- /* Floating Point Control Word. */
- { "fpc", &builtin_type_int },
+ case ABI_LINUX_ZSERIES:
+ if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+ || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)
+ || (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))
+ return 1;
- /* Floating Point Registers. */
- { "f0", &builtin_type_double },
- { "f1", &builtin_type_double },
- { "f2", &builtin_type_double },
- { "f3", &builtin_type_double },
- { "f4", &builtin_type_double },
- { "f5", &builtin_type_double },
- { "f6", &builtin_type_double },
- { "f7", &builtin_type_double },
- { "f8", &builtin_type_double },
- { "f9", &builtin_type_double },
- { "f10", &builtin_type_double },
- { "f11", &builtin_type_double },
- { "f12", &builtin_type_double },
- { "f13", &builtin_type_double },
- { "f14", &builtin_type_double },
- { "f15", &builtin_type_double },
-
- /* Pseudo registers. */
- { "pc", &builtin_type_void_func_ptr },
- { "cc", &builtin_type_int },
-};
+ break;
+ }
-/* Return the name of register REGNUM. */
-static const char *
-s390_register_name (int regnum)
-{
- gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
- return s390_register_info[regnum].name;
+ return 0;
}
-/* Return the GDB type object for the "standard" data type of data in
- register REGNUM. */
-static struct type *
-s390_register_type (struct gdbarch *gdbarch, int regnum)
-{
- gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
- return *s390_register_info[regnum].type;
-}
/* DWARF Register Mapping. */
/* Program Status Word. */
S390_PSWM_REGNUM,
- S390_PSWA_REGNUM
+ S390_PSWA_REGNUM,
+
+ /* GPR Lower Half Access. */
+ S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+ S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+ S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+ S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
};
/* Convert DWARF register number REG to the appropriate register
number used by GDB. */
static int
-s390_dwarf_reg_to_regnum (int reg)
+s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
{
- int regnum = -1;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (reg >= 0 || reg < ARRAY_SIZE (s390_dwarf_regmap))
- regnum = s390_dwarf_regmap[reg];
+ /* In a 32-on-64 debug scenario, debug info refers to the full 64-bit
+ GPRs. Note that call frame information still refers to the 32-bit
+ lower halves, because s390_adjust_frame_regnum uses register numbers
+ 66 .. 81 to access GPRs. */
+ if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
+ return tdep->gpr_full_regnum + reg;
- if (regnum == -1)
- warning ("Unmapped DWARF Register #%d encountered\n", reg);
+ if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
+ return s390_dwarf_regmap[reg];
+
+ warning (_("Unmapped DWARF Register #%d encountered."), reg);
+ return -1;
+}
- return regnum;
+/* Translate a .eh_frame register to DWARF register, or adjust a
+ .debug_frame register. */
+static int
+s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
+{
+ /* See s390_dwarf_reg_to_regnum for comments. */
+ return (num >= 0 && num < 16)? num + 66 : num;
}
-/* Pseudo registers - PC and condition code. */
-static void
-s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, void *buf)
+/* Pseudo registers. */
+
+static const char *
+s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
{
- ULONGEST val;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- switch (regnum)
- {
- case S390_PC_REGNUM:
- regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
- store_unsigned_integer (buf, 4, val & 0x7fffffff);
- break;
+ if (regnum == tdep->pc_regnum)
+ return "pc";
- case S390_CC_REGNUM:
- regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
- store_unsigned_integer (buf, 4, (val >> 12) & 3);
- break;
+ if (regnum == tdep->cc_regnum)
+ return "cc";
- default:
- internal_error (__FILE__, __LINE__, "invalid regnum");
+ if (tdep->gpr_full_regnum != -1
+ && regnum >= tdep->gpr_full_regnum
+ && regnum < tdep->gpr_full_regnum + 16)
+ {
+ static const char *full_name[] = {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
+ };
+ return full_name[regnum - tdep->gpr_full_regnum];
}
+
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
-static void
-s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, const void *buf)
+static struct type *
+s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
{
- ULONGEST val, psw;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- switch (regnum)
- {
- case S390_PC_REGNUM:
- val = extract_unsigned_integer (buf, 4);
- regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
- psw = (psw & 0x80000000) | (val & 0x7fffffff);
- regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, psw);
- break;
+ if (regnum == tdep->pc_regnum)
+ return builtin_type (gdbarch)->builtin_func_ptr;
- case S390_CC_REGNUM:
- val = extract_unsigned_integer (buf, 4);
- regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
- psw = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
- regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
- break;
+ if (regnum == tdep->cc_regnum)
+ return builtin_type (gdbarch)->builtin_int;
- default:
- internal_error (__FILE__, __LINE__, "invalid regnum");
- }
+ if (tdep->gpr_full_regnum != -1
+ && regnum >= tdep->gpr_full_regnum
+ && regnum < tdep->gpr_full_regnum + 16)
+ return builtin_type (gdbarch)->builtin_uint64;
+
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
static void
-s390x_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, void *buf)
+s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int regsize = register_size (gdbarch, regnum);
ULONGEST val;
- switch (regnum)
+ if (regnum == tdep->pc_regnum)
{
- case S390_PC_REGNUM:
- regcache_raw_read (regcache, S390_PSWA_REGNUM, buf);
- break;
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+ if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+ val &= 0x7fffffff;
+ store_unsigned_integer (buf, regsize, byte_order, val);
+ return;
+ }
- case S390_CC_REGNUM:
+ if (regnum == tdep->cc_regnum)
+ {
regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
- store_unsigned_integer (buf, 4, (val >> 44) & 3);
- break;
+ if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+ val = (val >> 12) & 3;
+ else
+ val = (val >> 44) & 3;
+ store_unsigned_integer (buf, regsize, byte_order, val);
+ return;
+ }
- default:
- internal_error (__FILE__, __LINE__, "invalid regnum");
+ if (tdep->gpr_full_regnum != -1
+ && regnum >= tdep->gpr_full_regnum
+ && regnum < tdep->gpr_full_regnum + 16)
+ {
+ ULONGEST val_upper;
+ regnum -= tdep->gpr_full_regnum;
+
+ regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
+ regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
+ &val_upper);
+ val |= val_upper << 32;
+ store_unsigned_integer (buf, regsize, byte_order, val);
+ return;
}
+
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
static void
-s390x_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, const void *buf)
+s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int regsize = register_size (gdbarch, regnum);
ULONGEST val, psw;
- switch (regnum)
+ if (regnum == tdep->pc_regnum)
{
- case S390_PC_REGNUM:
- regcache_raw_write (regcache, S390_PSWA_REGNUM, buf);
- break;
+ val = extract_unsigned_integer (buf, regsize, byte_order);
+ if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+ {
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
+ val = (psw & 0x80000000) | (val & 0x7fffffff);
+ }
+ regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);
+ return;
+ }
- case S390_CC_REGNUM:
- val = extract_unsigned_integer (buf, 4);
+ if (regnum == tdep->cc_regnum)
+ {
+ val = extract_unsigned_integer (buf, regsize, byte_order);
regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
- psw = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
- regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
- break;
+ if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+ val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
+ else
+ val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);
+ return;
+ }
- default:
- internal_error (__FILE__, __LINE__, "invalid regnum");
+ if (tdep->gpr_full_regnum != -1
+ && regnum >= tdep->gpr_full_regnum
+ && regnum < tdep->gpr_full_regnum + 16)
+ {
+ regnum -= tdep->gpr_full_regnum;
+ val = extract_unsigned_integer (buf, regsize, byte_order);
+ regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,
+ val & 0xffffffff);
+ regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
+ val >> 32);
+ return;
}
+
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
/* 'float' values are stored in the upper half of floating-point
registers, even though we are otherwise a big-endian platform. */
-static int
-s390_convert_register_p (int regno, struct type *type)
-{
- return (regno >= S390_F0_REGNUM && regno <= S390_F15_REGNUM)
- && TYPE_LENGTH (type) < 8;
-}
-
-static void
-s390_register_to_value (struct frame_info *frame, int regnum,
- struct type *valtype, void *out)
+static struct value *
+s390_value_from_register (struct type *type, int regnum,
+ struct frame_info *frame)
{
- char in[8];
- int len = TYPE_LENGTH (valtype);
- gdb_assert (len < 8);
-
- get_frame_register (frame, regnum, in);
- memcpy (out, in, len);
-}
+ struct value *value = default_value_from_register (type, regnum, frame);
+ int len = TYPE_LENGTH (type);
-static void
-s390_value_to_register (struct frame_info *frame, int regnum,
- struct type *valtype, const void *in)
-{
- char out[8];
- int len = TYPE_LENGTH (valtype);
- gdb_assert (len < 8);
+ if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM && len < 8)
+ set_value_offset (value, 0);
- memset (out, 0, 8);
- memcpy (out, in, len);
- put_frame_register (frame, regnum, out);
+ return value;
}
/* Register groups. */
static int
-s390_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
- struct reggroup *group)
+s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Registers displayed via 'info regs'. */
- if (group == general_reggroup)
- return (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
- || regnum == S390_PC_REGNUM
- || regnum == S390_CC_REGNUM;
-
- /* Registers displayed via 'info float'. */
- if (group == float_reggroup)
- return (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
- || regnum == S390_FPC_REGNUM;
-
- /* Registers that need to be saved/restored in order to
+ /* PC and CC pseudo registers need to be saved/restored in order to
push or pop frames. */
if (group == save_reggroup || group == restore_reggroup)
- return regnum != S390_PSWM_REGNUM && regnum != S390_PSWA_REGNUM;
+ return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;
return default_register_reggroup_p (gdbarch, regnum, group);
}
/* Floating Point Registers. */
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
+ /* GPR Uppper Halves. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
};
int s390x_regmap_gregset[S390_NUM_REGS] =
{
+ /* Program Status Word. */
0x00, 0x08,
/* General Purpose Registers. */
0x10, 0x18, 0x20, 0x28,
/* Floating Point Registers. */
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
+ /* GPR Uppper Halves. */
+ 0x10, 0x18, 0x20, 0x28,
+ 0x30, 0x38, 0x40, 0x48,
+ 0x50, 0x58, 0x60, 0x68,
+ 0x70, 0x78, 0x80, 0x88,
};
int s390_regmap_fpregset[S390_NUM_REGS] =
0x28, 0x30, 0x38, 0x40,
0x48, 0x50, 0x58, 0x60,
0x68, 0x70, 0x78, 0x80,
+ /* GPR Uppper Halves. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390_regmap_upper[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ -1, -1,
+ /* General Purpose Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Access Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* GPR Uppper Halves. */
+ 0x00, 0x04, 0x08, 0x0c,
+ 0x10, 0x14, 0x18, 0x1c,
+ 0x20, 0x24, 0x28, 0x2c,
+ 0x30, 0x34, 0x38, 0x3c,
};
/* Supply register REGNUM from the register set REGSET to register cache
}
}
+/* Collect register REGNUM from the register cache REGCACHE and store
+ it in the buffer specified by REGS and LEN as described by the
+ general-purpose register set REGSET. If REGNUM is -1, do this for
+ all registers in REGSET. */
+static void
+s390_collect_regset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *regs, size_t len)
+{
+ const int *offset = regset->descr;
+ int i;
+
+ for (i = 0; i < S390_NUM_REGS; i++)
+ {
+ if ((regnum == i || regnum == -1) && offset[i] != -1)
+ regcache_raw_collect (regcache, i, (char *)regs + offset[i]);
+ }
+}
+
static const struct regset s390_gregset = {
s390_regmap_gregset,
- s390_supply_regset
+ s390_supply_regset,
+ s390_collect_regset
};
static const struct regset s390x_gregset = {
s390x_regmap_gregset,
- s390_supply_regset
+ s390_supply_regset,
+ s390_collect_regset
};
static const struct regset s390_fpregset = {
s390_regmap_fpregset,
- s390_supply_regset
+ s390_supply_regset,
+ s390_collect_regset
+};
+
+static const struct regset s390_upper_regset = {
+ s390_regmap_upper,
+ s390_supply_regset,
+ s390_collect_regset
+};
+
+static struct core_regset_section s390_upper_regset_sections[] =
+{
+ { ".reg", s390_sizeof_gregset, "general-purpose" },
+ { ".reg2", s390_sizeof_fpregset, "floating-point" },
+ { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
+ { NULL, 0}
};
/* Return the appropriate register set for the core section identified
by SECT_NAME and SECT_SIZE. */
-const struct regset *
+static const struct regset *
s390_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name, size_t sect_size)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset)
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)
return tdep->gregset;
- if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
+ if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)
return tdep->fpregset;
+ if (strcmp (sect_name, ".reg-s390-high-gprs") == 0 && sect_size >= 16*4)
+ return &s390_upper_regset;
+
return NULL;
}
+static const struct target_desc *
+s390_core_read_description (struct gdbarch *gdbarch,
+ struct target_ops *target, bfd *abfd)
+{
+ asection *high_gprs = bfd_get_section_by_name (abfd, ".reg-s390-high-gprs");
+ asection *section = bfd_get_section_by_name (abfd, ".reg");
+ if (!section)
+ return NULL;
+
+ switch (bfd_section_size (abfd, section))
+ {
+ case s390_sizeof_gregset:
+ return high_gprs? tdesc_s390_linux64 : tdesc_s390_linux32;
+
+ case s390x_sizeof_gregset:
+ return tdesc_s390x_linux64;
-#define GDB_TARGET_IS_ESAME (TARGET_ARCHITECTURE->mach == bfd_mach_s390_64)
-#define S390_GPR_SIZE (GDB_TARGET_IS_ESAME ? 8 : 4)
-#define S390_FPR_SIZE (8)
-#define S390_MAX_INSTR_SIZE (6)
-#define S390_SYSCALL_OPCODE (0x0a)
-#define S390_SYSCALL_SIZE (2)
-#define S390_SIGCONTEXT_SREGS_OFFSET (8)
-#define S390X_SIGCONTEXT_SREGS_OFFSET (8)
-#define S390_SIGREGS_FP0_OFFSET (144)
-#define S390X_SIGREGS_FP0_OFFSET (216)
-#define S390_UC_MCONTEXT_OFFSET (256)
-#define S390X_UC_MCONTEXT_OFFSET (344)
-#define S390_STACK_FRAME_OVERHEAD 16*S390_GPR_SIZE+32
-#define S390_STACK_PARAMETER_ALIGNMENT S390_GPR_SIZE
-#define S390_NUM_FP_PARAMETER_REGISTERS (GDB_TARGET_IS_ESAME ? 4:2)
-#define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96)
-#define s390_NR_sigreturn 119
-#define s390_NR_rt_sigreturn 173
-
-
-
-struct frame_extra_info
-{
- int initialised;
- int good_prologue;
- CORE_ADDR function_start;
- CORE_ADDR skip_prologue_function_start;
- CORE_ADDR saved_pc_valid;
- CORE_ADDR saved_pc;
- CORE_ADDR sig_fixed_saved_pc_valid;
- CORE_ADDR sig_fixed_saved_pc;
- CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */
- CORE_ADDR stack_bought_valid;
- CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */
- CORE_ADDR sigcontext;
-};
+ default:
+ return NULL;
+ }
+}
+
+
+/* Decoding S/390 instructions. */
+
+/* Named opcode values for the S/390 instructions we recognize. Some
+ instructions have their opcode split across two fields; those are the
+ op1_* and op2_* enums. */
+enum
+ {
+ op1_lhi = 0xa7, op2_lhi = 0x08,
+ op1_lghi = 0xa7, op2_lghi = 0x09,
+ op1_lgfi = 0xc0, op2_lgfi = 0x01,
+ op_lr = 0x18,
+ op_lgr = 0xb904,
+ op_l = 0x58,
+ op1_ly = 0xe3, op2_ly = 0x58,
+ op1_lg = 0xe3, op2_lg = 0x04,
+ op_lm = 0x98,
+ op1_lmy = 0xeb, op2_lmy = 0x98,
+ op1_lmg = 0xeb, op2_lmg = 0x04,
+ op_st = 0x50,
+ op1_sty = 0xe3, op2_sty = 0x50,
+ op1_stg = 0xe3, op2_stg = 0x24,
+ op_std = 0x60,
+ op_stm = 0x90,
+ op1_stmy = 0xeb, op2_stmy = 0x90,
+ op1_stmg = 0xeb, op2_stmg = 0x24,
+ op1_aghi = 0xa7, op2_aghi = 0x0b,
+ op1_ahi = 0xa7, op2_ahi = 0x0a,
+ op1_agfi = 0xc2, op2_agfi = 0x08,
+ op1_afi = 0xc2, op2_afi = 0x09,
+ op1_algfi= 0xc2, op2_algfi= 0x0a,
+ op1_alfi = 0xc2, op2_alfi = 0x0b,
+ op_ar = 0x1a,
+ op_agr = 0xb908,
+ op_a = 0x5a,
+ op1_ay = 0xe3, op2_ay = 0x5a,
+ op1_ag = 0xe3, op2_ag = 0x08,
+ op1_slgfi= 0xc2, op2_slgfi= 0x04,
+ op1_slfi = 0xc2, op2_slfi = 0x05,
+ op_sr = 0x1b,
+ op_sgr = 0xb909,
+ op_s = 0x5b,
+ op1_sy = 0xe3, op2_sy = 0x5b,
+ op1_sg = 0xe3, op2_sg = 0x09,
+ op_nr = 0x14,
+ op_ngr = 0xb980,
+ op_la = 0x41,
+ op1_lay = 0xe3, op2_lay = 0x71,
+ op1_larl = 0xc0, op2_larl = 0x00,
+ op_basr = 0x0d,
+ op_bas = 0x4d,
+ op_bcr = 0x07,
+ op_bc = 0x0d,
+ op_bctr = 0x06,
+ op_bctgr = 0xb946,
+ op_bct = 0x46,
+ op1_bctg = 0xe3, op2_bctg = 0x46,
+ op_bxh = 0x86,
+ op1_bxhg = 0xeb, op2_bxhg = 0x44,
+ op_bxle = 0x87,
+ op1_bxleg= 0xeb, op2_bxleg= 0x45,
+ op1_bras = 0xa7, op2_bras = 0x05,
+ op1_brasl= 0xc0, op2_brasl= 0x05,
+ op1_brc = 0xa7, op2_brc = 0x04,
+ op1_brcl = 0xc0, op2_brcl = 0x04,
+ op1_brct = 0xa7, op2_brct = 0x06,
+ op1_brctg= 0xa7, op2_brctg= 0x07,
+ op_brxh = 0x84,
+ op1_brxhg= 0xec, op2_brxhg= 0x44,
+ op_brxle = 0x85,
+ op1_brxlg= 0xec, op2_brxlg= 0x45,
+ };
-static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi);
+/* Read a single instruction from address AT. */
+#define S390_MAX_INSTR_SIZE 6
static int
s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
{
+ static int s390_instrlen[] = { 2, 4, 4, 6 };
int instrlen;
- static int s390_instrlen[] = {
- 2,
- 4,
- 4,
- 6
- };
if (target_read_memory (at, &instr[0], 2))
return -1;
instrlen = s390_instrlen[instr[0] >> 6];
return instrlen;
}
-static void
-s390_memset_extra_info (struct frame_extra_info *fextra_info)
-{
- memset (fextra_info, 0, sizeof (struct frame_extra_info));
-}
-
-
-/* Prologue analysis. */
-
-/* When we analyze a prologue, we're really doing 'abstract
- interpretation' or 'pseudo-evaluation': running the function's code
- in simulation, but using conservative approximations of the values
- it would have when it actually runs. For example, if our function
- starts with the instruction:
-
- ahi r1, 42 # add halfword immediate 42 to r1
-
- we don't know exactly what value will be in r1 after executing this
- instruction, but we do know it'll be 42 greater than its original
- value.
-
- If we then see an instruction like:
-
- ahi r1, 22 # add halfword immediate 22 to r1
-
- we still don't know what r1's value is, but again, we can say it is
- now 64 greater than its original value.
-
- If the next instruction were:
-
- lr r2, r1 # set r2 to r1's value
-
- then we can say that r2's value is now the original value of r1
- plus 64. And so on.
-
- Of course, this can only go so far before it gets unreasonable. If
- we wanted to be able to say anything about the value of r1 after
- the instruction:
-
- xr r1, r3 # exclusive-or r1 and r3, place result in r1
-
- then things would get pretty complex. But remember, we're just
- doing a conservative approximation; if exclusive-or instructions
- aren't relevant to prologues, we can just say r1's value is now
- 'unknown'. We can ignore things that are too complex, if that loss
- of information is acceptable for our application.
-
- Once you've reached an instruction that you don't know how to
- simulate, you stop. Now you examine the state of the registers and
- stack slots you've kept track of. For example:
-
- - To see how large your stack frame is, just check the value of sp;
- if it's the original value of sp minus a constant, then that
- constant is the stack frame's size. If the sp's value has been
- marked as 'unknown', then that means the prologue has done
- something too complex for us to track, and we don't know the
- frame size.
-
- - To see whether we've saved the SP in the current frame's back
- chain slot, we just check whether the current value of the back
- chain stack slot is the original value of the sp.
-
- Sure, this takes some work. But prologue analyzers aren't
- quick-and-simple pattern patching to recognize a few fixed prologue
- forms any more; they're big, hairy functions. Along with inferior
- function calls, prologue analysis accounts for a substantial
- portion of the time needed to stabilize a GDB port. So I think
- it's worthwhile to look for an approach that will be easier to
- understand and maintain. In the approach used here:
-
- - It's easier to see that the analyzer is correct: you just see
- whether the analyzer properly (albiet conservatively) simulates
- the effect of each instruction.
-
- - It's easier to extend the analyzer: you can add support for new
- instructions, and know that you haven't broken anything that
- wasn't already broken before.
-
- - It's orthogonal: to gather new information, you don't need to
- complicate the code for each instruction. As long as your domain
- of conservative values is already detailed enough to tell you
- what you need, then all the existing instruction simulations are
- already gathering the right data for you.
-
- A 'struct prologue_value' is a conservative approximation of the
- real value the register or stack slot will have. */
-
-struct prologue_value {
-
- /* What sort of value is this? This determines the interpretation
- of subsequent fields. */
- enum {
-
- /* We don't know anything about the value. This is also used for
- values we could have kept track of, when doing so would have
- been too complex and we don't want to bother. The bottom of
- our lattice. */
- pv_unknown,
-
- /* A known constant. K is its value. */
- pv_constant,
-
- /* The value that register REG originally had *UPON ENTRY TO THE
- FUNCTION*, plus K. If K is zero, this means, obviously, just
- the value REG had upon entry to the function. REG is a GDB
- register number. Before we start interpreting, we initialize
- every register R to { pv_register, R, 0 }. */
- pv_register,
-
- } kind;
-
- /* The meanings of the following fields depend on 'kind'; see the
- comments for the specific 'kind' values. */
- int reg;
- CORE_ADDR k;
-};
+/* The functions below are for recognizing and decoding S/390
+ instructions of various formats. Each of them checks whether INSN
+ is an instruction of the given format, with the specified opcodes.
+ If it is, it sets the remaining arguments to the values of the
+ instruction's fields, and returns a non-zero value; otherwise, it
+ returns zero.
-/* Set V to be unknown. */
-static void
-pv_set_to_unknown (struct prologue_value *v)
+ These functions' arguments appear in the order they appear in the
+ instruction, not in the machine-language form. So, opcodes always
+ come first, even though they're sometimes scattered around the
+ instructions. And displacements appear before base and extension
+ registers, as they do in the assembly syntax, not at the end, as
+ they do in the machine language. */
+static int
+is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
{
- v->kind = pv_unknown;
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a 16-bit signed quantity. */
+ *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+ return 1;
+ }
+ else
+ return 0;
}
-/* Set V to the constant K. */
-static void
-pv_set_to_constant (struct prologue_value *v, CORE_ADDR k)
+static int
+is_ril (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, int *i2)
{
- v->kind = pv_constant;
- v->k = k;
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a signed quantity. If the host 'int' is 32 bits long,
+ no sign extension is necessary, but we don't want to assume
+ that. */
+ *i2 = (((insn[2] << 24)
+ | (insn[3] << 16)
+ | (insn[4] << 8)
+ | (insn[5])) ^ 0x80000000) - 0x80000000;
+ return 1;
+ }
+ else
+ return 0;
}
-/* Set V to the original value of register REG, plus K. */
-static void
-pv_set_to_register (struct prologue_value *v, int reg, CORE_ADDR k)
+static int
+is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
{
- v->kind = pv_register;
- v->reg = reg;
- v->k = k;
-}
-
-
-/* If one of *A and *B is a constant, and the other isn't, swap the
- pointers as necessary to ensure that *B points to the constant.
- This can reduce the number of cases we need to analyze in the
- functions below. */
-static void
-pv_constant_last (struct prologue_value **a,
- struct prologue_value **b)
-{
- if ((*a)->kind == pv_constant
- && (*b)->kind != pv_constant)
- {
- struct prologue_value *temp = *a;
- *a = *b;
- *b = temp;
- }
-}
-
-
-/* Set SUM to the sum of A and B. SUM, A, and B may point to the same
- 'struct prologue_value' object. */
-static void
-pv_add (struct prologue_value *sum,
- struct prologue_value *a,
- struct prologue_value *b)
-{
- pv_constant_last (&a, &b);
-
- /* We can handle adding constants to registers, and other constants. */
- if (b->kind == pv_constant
- && (a->kind == pv_register
- || a->kind == pv_constant))
- {
- sum->kind = a->kind;
- sum->reg = a->reg; /* not meaningful if a is pv_constant, but
- harmless */
- sum->k = a->k + b->k;
- }
-
- /* Anything else we don't know how to add. We don't have a
- representation for, say, the sum of two registers, or a multiple
- of a register's value (adding a register to itself). */
- else
- sum->kind = pv_unknown;
-}
-
-
-/* Add the constant K to V. */
-static void
-pv_add_constant (struct prologue_value *v, CORE_ADDR k)
-{
- struct prologue_value pv_k;
-
- /* Rather than thinking of all the cases we can and can't handle,
- we'll just let pv_add take care of that for us. */
- pv_set_to_constant (&pv_k, k);
- pv_add (v, v, &pv_k);
-}
-
-
-/* Subtract B from A, and put the result in DIFF.
-
- This isn't quite the same as negating B and adding it to A, since
- we don't have a representation for the negation of anything but a
- constant. For example, we can't negate { pv_register, R1, 10 },
- but we do know that { pv_register, R1, 10 } minus { pv_register,
- R1, 5 } is { pv_constant, <ignored>, 5 }.
-
- This means, for example, that we can subtract two stack addresses;
- they're both relative to the original SP. Since the frame pointer
- is set based on the SP, its value will be the original SP plus some
- constant (probably zero), so we can use its value just fine. */
-static void
-pv_subtract (struct prologue_value *diff,
- struct prologue_value *a,
- struct prologue_value *b)
-{
- pv_constant_last (&a, &b);
-
- /* We can subtract a constant from another constant, or from a
- register. */
- if (b->kind == pv_constant
- && (a->kind == pv_register
- || a->kind == pv_constant))
- {
- diff->kind = a->kind;
- diff->reg = a->reg; /* not always meaningful, but harmless */
- diff->k = a->k - b->k;
- }
-
- /* We can subtract a register from itself, yielding a constant. */
- else if (a->kind == pv_register
- && b->kind == pv_register
- && a->reg == b->reg)
- {
- diff->kind = pv_constant;
- diff->k = a->k - b->k;
- }
-
- /* We don't know how to subtract anything else. */
- else
- diff->kind = pv_unknown;
-}
-
-
-/* Set AND to the logical and of A and B. */
-static void
-pv_logical_and (struct prologue_value *and,
- struct prologue_value *a,
- struct prologue_value *b)
-{
- pv_constant_last (&a, &b);
-
- /* We can 'and' two constants. */
- if (a->kind == pv_constant
- && b->kind == pv_constant)
- {
- and->kind = pv_constant;
- and->k = a->k & b->k;
- }
-
- /* We can 'and' anything with the constant zero. */
- else if (b->kind == pv_constant
- && b->k == 0)
- {
- and->kind = pv_constant;
- and->k = 0;
- }
-
- /* We can 'and' anything with ~0. */
- else if (b->kind == pv_constant
- && b->k == ~ (CORE_ADDR) 0)
- *and = *a;
-
- /* We can 'and' a register with itself. */
- else if (a->kind == pv_register
- && b->kind == pv_register
- && a->reg == b->reg
- && a->k == b->k)
- *and = *a;
-
- /* Otherwise, we don't know. */
- else
- pv_set_to_unknown (and);
-}
-
-
-/* Return non-zero iff A and B are identical expressions.
-
- This is not the same as asking if the two values are equal; the
- result of such a comparison would have to be a pv_boolean, and
- asking whether two 'unknown' values were equal would give you
- pv_maybe. Same for comparing, say, { pv_register, R1, 0 } and {
- pv_register, R2, 0}. Instead, this is asking whether the two
- representations are the same. */
-static int
-pv_is_identical (struct prologue_value *a,
- struct prologue_value *b)
-{
- if (a->kind != b->kind)
- return 0;
-
- switch (a->kind)
- {
- case pv_unknown:
- return 1;
- case pv_constant:
- return (a->k == b->k);
- case pv_register:
- return (a->reg == b->reg && a->k == b->k);
- default:
- gdb_assert (0);
- }
-}
-
-
-/* Return non-zero if A is the original value of register number R
- plus K, zero otherwise. */
-static int
-pv_is_register (struct prologue_value *a, int r, CORE_ADDR k)
-{
- return (a->kind == pv_register
- && a->reg == r
- && a->k == k);
-}
-
-
-/* A prologue-value-esque boolean type, including "maybe", when we
- can't figure out whether something is true or not. */
-enum pv_boolean {
- pv_maybe,
- pv_definite_yes,
- pv_definite_no,
-};
-
-
-/* Decide whether a reference to SIZE bytes at ADDR refers exactly to
- an element of an array. The array starts at ARRAY_ADDR, and has
- ARRAY_LEN values of ELT_SIZE bytes each. If ADDR definitely does
- refer to an array element, set *I to the index of the referenced
- element in the array, and return pv_definite_yes. If it definitely
- doesn't, return pv_definite_no. If we can't tell, return pv_maybe.
-
- If the reference does touch the array, but doesn't fall exactly on
- an element boundary, or doesn't refer to the whole element, return
- pv_maybe. */
-static enum pv_boolean
-pv_is_array_ref (struct prologue_value *addr,
- CORE_ADDR size,
- struct prologue_value *array_addr,
- CORE_ADDR array_len,
- CORE_ADDR elt_size,
- int *i)
-{
- struct prologue_value offset;
-
- /* Note that, since ->k is a CORE_ADDR, and CORE_ADDR is unsigned,
- if addr is *before* the start of the array, then this isn't going
- to be negative... */
- pv_subtract (&offset, addr, array_addr);
-
- if (offset.kind == pv_constant)
- {
- /* This is a rather odd test. We want to know if the SIZE bytes
- at ADDR don't overlap the array at all, so you'd expect it to
- be an || expression: "if we're completely before || we're
- completely after". But with unsigned arithmetic, things are
- different: since it's a number circle, not a number line, the
- right values for offset.k are actually one contiguous range. */
- if (offset.k <= -size
- && offset.k >= array_len * elt_size)
- return pv_definite_no;
- else if (offset.k % elt_size != 0
- || size != elt_size)
- return pv_maybe;
- else
- {
- *i = offset.k / elt_size;
- return pv_definite_yes;
- }
- }
- else
- return pv_maybe;
-}
-
-
-
-/* Decoding S/390 instructions. */
-
-/* Named opcode values for the S/390 instructions we recognize. Some
- instructions have their opcode split across two fields; those are the
- op1_* and op2_* enums. */
-enum
- {
- op1_aghi = 0xa7, op2_aghi = 0xb,
- op1_ahi = 0xa7, op2_ahi = 0xa,
- op_ar = 0x1a,
- op_basr = 0x0d,
- op1_bras = 0xa7, op2_bras = 0x5,
- op_l = 0x58,
- op_la = 0x41,
- op1_larl = 0xc0, op2_larl = 0x0,
- op_lgr = 0xb904,
- op1_lghi = 0xa7, op2_lghi = 0x9,
- op1_lhi = 0xa7, op2_lhi = 0x8,
- op_lr = 0x18,
- op_nr = 0x14,
- op_ngr = 0xb980,
- op_s = 0x5b,
- op_st = 0x50,
- op_std = 0x60,
- op1_stg = 0xe3, op2_stg = 0x24,
- op_stm = 0x90,
- op1_stmg = 0xeb, op2_stmg = 0x24,
- op_lm = 0x98,
- op1_lmg = 0xeb, op2_lmg = 0x04,
- op_svc = 0x0a,
- };
-
-
-/* The functions below are for recognizing and decoding S/390
- instructions of various formats. Each of them checks whether INSN
- is an instruction of the given format, with the specified opcodes.
- If it is, it sets the remaining arguments to the values of the
- instruction's fields, and returns a non-zero value; otherwise, it
- returns zero.
-
- These functions' arguments appear in the order they appear in the
- instruction, not in the machine-language form. So, opcodes always
- come first, even though they're sometimes scattered around the
- instructions. And displacements appear before base and extension
- registers, as they do in the assembly syntax, not at the end, as
- they do in the machine language. */
-static int
-is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
-{
- if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ if (insn[0] == op)
{
*r1 = (insn[1] >> 4) & 0xf;
- /* i2 is a 16-bit signed quantity. */
- *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+ *r2 = insn[1] & 0xf;
return 1;
}
else
static int
-is_ril (bfd_byte *insn, int op1, int op2,
- unsigned int *r1, int *i2)
+is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
{
- if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ if (((insn[0] << 8) | insn[1]) == op)
{
- *r1 = (insn[1] >> 4) & 0xf;
- /* i2 is a signed quantity. If the host 'int' is 32 bits long,
- no sign extension is necessary, but we don't want to assume
- that. */
- *i2 = (((insn[2] << 24)
- | (insn[3] << 16)
- | (insn[4] << 8)
- | (insn[5])) ^ 0x80000000) - 0x80000000;
+ /* Yes, insn[3]. insn[2] is unused in RRE format. */
+ *r1 = (insn[3] >> 4) & 0xf;
+ *r2 = insn[3] & 0xf;
return 1;
}
else
static int
-is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+is_rs (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
{
if (insn[0] == op)
{
*r1 = (insn[1] >> 4) & 0xf;
- *r2 = insn[1] & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
return 1;
}
else
static int
-is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+is_rsy (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
{
- if (((insn[0] << 8) | insn[1]) == op)
+ if (insn[0] == op1
+ && insn[5] == op2)
{
- /* Yes, insn[3]. insn[2] is unused in RRE format. */
- *r1 = (insn[3] >> 4) & 0xf;
- *r2 = insn[3] & 0xf;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ /* The 'long displacement' is a 20-bit signed integer. */
+ *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
+ ^ 0x80000) - 0x80000;
return 1;
}
else
static int
-is_rs (bfd_byte *insn, int op,
- unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+is_rsi (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *r3, int *i2)
{
if (insn[0] == op)
{
*r1 = (insn[1] >> 4) & 0xf;
*r3 = insn[1] & 0xf;
- *b2 = (insn[2] >> 4) & 0xf;
- *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ /* i2 is a 16-bit signed quantity. */
+ *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
return 1;
}
else
static int
-is_rse (bfd_byte *insn, int op1, int op2,
- unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+is_rie (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *r3, int *i2)
{
if (insn[0] == op1
- /* Yes, insn[5]. insn[4] is unused. */
&& insn[5] == op2)
{
*r1 = (insn[1] >> 4) & 0xf;
*r3 = insn[1] & 0xf;
- *b2 = (insn[2] >> 4) & 0xf;
- *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ /* i2 is a 16-bit signed quantity. */
+ *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
return 1;
}
else
static int
-is_rxe (bfd_byte *insn, int op1, int op2,
+is_rxy (bfd_byte *insn, int op1, int op2,
unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
{
if (insn[0] == op1
- /* Yes, insn[5]. insn[4] is unused. */
&& insn[5] == op2)
{
*r1 = (insn[1] >> 4) & 0xf;
*x2 = insn[1] & 0xf;
*b2 = (insn[2] >> 4) & 0xf;
- *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ /* The 'long displacement' is a 20-bit signed integer. */
+ *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
+ ^ 0x80000) - 0x80000;
return 1;
}
else
}
-/* Set ADDR to the effective address for an X-style instruction, like:
+/* Prologue analysis. */
+
+#define S390_NUM_GPRS 16
+#define S390_NUM_FPRS 16
+
+struct s390_prologue_data {
+
+ /* The stack. */
+ struct pv_area *stack;
+
+ /* The size and byte-order of a GPR or FPR. */
+ int gpr_size;
+ int fpr_size;
+ enum bfd_endian byte_order;
+
+ /* The general-purpose registers. */
+ pv_t gpr[S390_NUM_GPRS];
+
+ /* The floating-point registers. */
+ pv_t fpr[S390_NUM_FPRS];
+
+ /* The offset relative to the CFA where the incoming GPR N was saved
+ by the function prologue. 0 if not saved or unknown. */
+ int gpr_slot[S390_NUM_GPRS];
+
+ /* Likewise for FPRs. */
+ int fpr_slot[S390_NUM_FPRS];
+
+ /* Nonzero if the backchain was saved. This is assumed to be the
+ case when the incoming SP is saved at the current SP location. */
+ int back_chain_saved_p;
+};
+
+/* Return the effective address for an X-style instruction, like:
L R1, D2(X2, B2)
- Here, X2 and B2 are registers, and D2 is an unsigned 12-bit
+ Here, X2 and B2 are registers, and D2 is a signed 20-bit
constant; the effective address is the sum of all three. If either
X2 or B2 are zero, then it doesn't contribute to the sum --- this
- means that r0 can't be used as either X2 or B2.
-
- GPR is an array of general register values, indexed by GPR number,
- not GDB register number. */
-static void
-compute_x_addr (struct prologue_value *addr,
- struct prologue_value *gpr,
- unsigned int d2, unsigned int x2, unsigned int b2)
+ means that r0 can't be used as either X2 or B2. */
+static pv_t
+s390_addr (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2)
{
- /* We can't just add stuff directly in addr; it might alias some of
- the registers we need to read. */
- struct prologue_value result;
+ pv_t result;
- pv_set_to_constant (&result, d2);
+ result = pv_constant (d2);
if (x2)
- pv_add (&result, &result, &gpr[x2]);
+ result = pv_add (result, data->gpr[x2]);
if (b2)
- pv_add (&result, &result, &gpr[b2]);
+ result = pv_add (result, data->gpr[b2]);
- *addr = result;
+ return result;
}
+/* Do a SIZE-byte store of VALUE to D2(X2,B2). */
+static void
+s390_store (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
+ pv_t value)
+{
+ pv_t addr = s390_addr (data, d2, x2, b2);
+ pv_t offset;
-/* The number of GPR and FPR spill slots in an S/390 stack frame. We
- track general-purpose registers r2 -- r15, and floating-point
- registers f0, f2, f4, and f6. */
-#define S390_NUM_SPILL_SLOTS (14 + 4)
-#define S390_NUM_GPRS 16
-#define S390_NUM_FPRS 16
-
+ /* Check whether we are storing the backchain. */
+ offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
-/* If the SIZE bytes at ADDR are a stack slot we're actually tracking,
- return pv_definite_yes and set *STACK to point to the slot. If
- we're sure that they are not any of our stack slots, then return
- pv_definite_no. Otherwise, return pv_maybe.
- - GPR is an array indexed by GPR number giving the current values
- of the general-purpose registers.
- - SPILL is an array tracking the spill area of the caller's frame;
- SPILL[i] is the i'th spill slot. The spill slots are designated
- for r2 -- r15, and then f0, f2, f4, and f6.
- - BACK_CHAIN is the value of the back chain slot; it's only valid
- when the current frame actually has some space for a back chain
- slot --- that is, when the current value of the stack pointer
- (according to GPR) is at least S390_STACK_FRAME_OVERHEAD bytes
- less than its original value. */
-static enum pv_boolean
-s390_on_stack (struct prologue_value *addr,
- CORE_ADDR size,
- struct prologue_value *gpr,
- struct prologue_value *spill,
- struct prologue_value *back_chain,
- struct prologue_value **stack)
-{
- struct prologue_value gpr_spill_addr;
- struct prologue_value fpr_spill_addr;
- struct prologue_value back_chain_addr;
- int i;
- enum pv_boolean b;
+ if (pv_is_constant (offset) && offset.k == 0)
+ if (size == data->gpr_size
+ && pv_is_register_k (value, S390_SP_REGNUM, 0))
+ {
+ data->back_chain_saved_p = 1;
+ return;
+ }
- /* Construct the addresses of the spill arrays and the back chain. */
- pv_set_to_register (&gpr_spill_addr, S390_SP_REGNUM, 2 * S390_GPR_SIZE);
- pv_set_to_register (&fpr_spill_addr, S390_SP_REGNUM, 16 * S390_GPR_SIZE);
- back_chain_addr = gpr[S390_SP_REGNUM - S390_R0_REGNUM];
- /* We have to check for GPR and FPR references using two separate
- calls to pv_is_array_ref, since the GPR and FPR spill slots are
- different sizes. (SPILL is an array, but the thing it tracks
- isn't really an array.) */
+ /* Check whether we are storing a register into the stack. */
+ if (!pv_area_store_would_trash (data->stack, addr))
+ pv_area_store (data->stack, addr, size, value);
- /* Was it a reference to the GPR spill array? */
- b = pv_is_array_ref (addr, size, &gpr_spill_addr, 14, S390_GPR_SIZE, &i);
- if (b == pv_definite_yes)
- {
- *stack = &spill[i];
- return pv_definite_yes;
- }
- if (b == pv_maybe)
- return pv_maybe;
- /* Was it a reference to the FPR spill array? */
- b = pv_is_array_ref (addr, size, &fpr_spill_addr, 4, S390_FPR_SIZE, &i);
- if (b == pv_definite_yes)
- {
- *stack = &spill[14 + i];
- return pv_definite_yes;
- }
- if (b == pv_maybe)
- return pv_maybe;
-
- /* Was it a reference to the back chain?
- This isn't quite right. We ought to check whether we have
- actually allocated any new frame at all. */
- b = pv_is_array_ref (addr, size, &back_chain_addr, 1, S390_GPR_SIZE, &i);
- if (b == pv_definite_yes)
- {
- *stack = back_chain;
- return pv_definite_yes;
- }
- if (b == pv_maybe)
- return pv_maybe;
+ /* Note: If this is some store we cannot identify, you might think we
+ should forget our cached values, as any of those might have been hit.
- /* All the above queries returned definite 'no's. */
- return pv_definite_no;
+ However, we make the assumption that the register save areas are only
+ ever stored to once in any given function, and we do recognize these
+ stores. Thus every store we cannot recognize does not hit our data. */
}
-
-/* Do a SIZE-byte store of VALUE to ADDR. GPR, SPILL, and BACK_CHAIN,
- and the return value are as described for s390_on_stack, above.
- Note that, when this returns pv_maybe, we have to assume that all
- of our memory now contains unknown values. */
-static enum pv_boolean
-s390_store (struct prologue_value *addr,
- CORE_ADDR size,
- struct prologue_value *value,
- struct prologue_value *gpr,
- struct prologue_value *spill,
- struct prologue_value *back_chain)
+/* Do a SIZE-byte load from D2(X2,B2). */
+static pv_t
+s390_load (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
+
{
- struct prologue_value *stack;
- enum pv_boolean on_stack
- = s390_on_stack (addr, size, gpr, spill, back_chain, &stack);
+ pv_t addr = s390_addr (data, d2, x2, b2);
+ pv_t offset;
- if (on_stack == pv_definite_yes)
- *stack = *value;
+ /* If it's a load from an in-line constant pool, then we can
+ simulate that, under the assumption that the code isn't
+ going to change between the time the processor actually
+ executed it creating the current frame, and the time when
+ we're analyzing the code to unwind past that frame. */
+ if (pv_is_constant (addr))
+ {
+ struct target_section *secp;
+ secp = target_section_by_addr (¤t_target, addr.k);
+ if (secp != NULL
+ && (bfd_get_section_flags (secp->bfd, secp->the_bfd_section)
+ & SEC_READONLY))
+ return pv_constant (read_memory_integer (addr.k, size,
+ data->byte_order));
+ }
- return on_stack;
+ /* Check whether we are accessing one of our save slots. */
+ return pv_area_fetch (data->stack, addr, size);
}
-
-/* The current frame looks like a signal delivery frame: the first
- instruction is an 'svc' opcode. If the next frame is a signal
- handler's frame, set FI's saved register map to point into the
- signal context structure. */
+/* Function for finding saved registers in a 'struct pv_area'; we pass
+ this to pv_area_scan.
+
+ If VALUE is a saved register, ADDR says it was saved at a constant
+ offset from the frame base, and SIZE indicates that the whole
+ register was saved, record its offset in the reg_offset table in
+ PROLOGUE_UNTYPED. */
static void
-s390_get_signal_frame_info (struct frame_info *fi)
+s390_check_for_saved (void *data_untyped, pv_t addr, CORE_ADDR size, pv_t value)
{
- struct frame_info *next_frame = get_next_frame (fi);
+ struct s390_prologue_data *data = data_untyped;
+ int i, offset;
- if (next_frame
- && get_frame_extra_info (next_frame)
- && get_frame_extra_info (next_frame)->sigcontext)
- {
- /* We're definitely backtracing from a signal handler. */
- CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi);
- CORE_ADDR save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext
- + DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM));
- int reg;
+ if (!pv_is_register (addr, S390_SP_REGNUM))
+ return;
- for (reg = 0; reg < S390_NUM_GPRS; reg++)
- {
- saved_regs[S390_R0_REGNUM + reg] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
+ offset = 16 * data->gpr_size + 32 - addr.k;
- save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext
- + (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET :
- S390_SIGREGS_FP0_OFFSET));
- for (reg = 0; reg < S390_NUM_FPRS; reg++)
- {
- saved_regs[S390_F0_REGNUM + reg] = save_reg_addr;
- save_reg_addr += S390_FPR_SIZE;
- }
- }
-}
+ /* If we are storing the original value of a register, we want to
+ record the CFA offset. If the same register is stored multiple
+ times, the stack slot with the highest address counts. */
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ if (size == data->gpr_size
+ && pv_is_register_k (value, S390_R0_REGNUM + i, 0))
+ if (data->gpr_slot[i] == 0
+ || data->gpr_slot[i] > offset)
+ {
+ data->gpr_slot[i] = offset;
+ return;
+ }
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ if (size == data->fpr_size
+ && pv_is_register_k (value, S390_F0_REGNUM + i, 0))
+ if (data->fpr_slot[i] == 0
+ || data->fpr_slot[i] > offset)
+ {
+ data->fpr_slot[i] = offset;
+ return;
+ }
+}
-static int
-s390_get_frame_info (CORE_ADDR start_pc,
- struct frame_extra_info *fextra_info,
- struct frame_info *fi,
- int init_extra_info)
+/* Analyze the prologue of the function starting at START_PC,
+ continuing at most until CURRENT_PC. Initialize DATA to
+ hold all information we find out about the state of the registers
+ and stack slots. Return the address of the instruction after
+ the last one that changed the SP, FP, or back chain; or zero
+ on error. */
+static CORE_ADDR
+s390_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc,
+ CORE_ADDR current_pc,
+ struct s390_prologue_data *data)
{
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
/* Our return value:
- zero if we were able to read all the instructions we wanted, or
- -1 if we got an error trying to read memory. */
- int result = 0;
+ The address of the instruction after the last one that changed
+ the SP, FP, or back chain; zero if we got an error trying to
+ read memory. */
+ CORE_ADDR result = start_pc;
/* The current PC for our abstract interpretation. */
CORE_ADDR pc;
/* The address of the next instruction after that. */
CORE_ADDR next_pc;
- /* The general-purpose registers. */
- struct prologue_value gpr[S390_NUM_GPRS];
-
- /* The floating-point registers. */
- struct prologue_value fpr[S390_NUM_FPRS];
-
- /* The register spill stack slots in the caller's frame ---
- general-purpose registers r2 through r15, and floating-point
- registers. spill[i] is where gpr i+2 gets spilled;
- spill[(14, 15, 16, 17)] is where (f0, f2, f4, f6) get spilled. */
- struct prologue_value spill[S390_NUM_SPILL_SLOTS];
-
- /* The value of the back chain slot. This is only valid if the stack
- pointer is known to be less than its original value --- that is,
- if we have indeed allocated space on the stack. */
- struct prologue_value back_chain;
-
- /* The address of the instruction after the last one that changed
- the SP, FP, or back chain. */
- CORE_ADDR after_last_frame_setup_insn = start_pc;
-
/* Set up everything's initial value. */
{
int i;
+ data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
+
+ /* For the purpose of prologue tracking, we consider the GPR size to
+ be equal to the ABI word size, even if it is actually larger
+ (i.e. when running a 32-bit binary under a 64-bit kernel). */
+ data->gpr_size = word_size;
+ data->fpr_size = 8;
+ data->byte_order = gdbarch_byte_order (gdbarch);
+
for (i = 0; i < S390_NUM_GPRS; i++)
- pv_set_to_register (&gpr[i], S390_R0_REGNUM + i, 0);
+ data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
for (i = 0; i < S390_NUM_FPRS; i++)
- pv_set_to_register (&fpr[i], S390_F0_REGNUM + i, 0);
+ data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ data->gpr_slot[i] = 0;
- for (i = 0; i < S390_NUM_SPILL_SLOTS; i++)
- pv_set_to_unknown (&spill[i]);
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ data->fpr_slot[i] = 0;
- pv_set_to_unknown (&back_chain);
+ data->back_chain_saved_p = 0;
}
- /* Start interpreting instructions, until we hit something we don't
- know how to interpret. (Ideally, we should stop at the frame's
- real current PC, but at the moment, our callers don't give us
- that info.) */
- for (pc = start_pc; ; pc = next_pc)
+ /* Start interpreting instructions, until we hit the frame's
+ current PC or the first branch instruction. */
+ for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
{
bfd_byte insn[S390_MAX_INSTR_SIZE];
int insn_len = s390_readinstruction (insn, pc);
+ bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
+ bfd_byte *insn32 = word_size == 4 ? insn : dummy;
+ bfd_byte *insn64 = word_size == 8 ? insn : dummy;
+
/* Fields for various kinds of instructions. */
- unsigned int b2, r1, r2, d2, x2, r3;
- int i2;
+ unsigned int b2, r1, r2, x2, r3;
+ int i2, d2;
- /* The values of SP, FP, and back chain before this instruction,
+ /* The values of SP and FP before this instruction,
for detecting instructions that change them. */
- struct prologue_value pre_insn_sp, pre_insn_fp, pre_insn_back_chain;
+ pv_t pre_insn_sp, pre_insn_fp;
+ /* Likewise for the flag whether the back chain was saved. */
+ int pre_insn_back_chain_saved_p;
/* If we got an error trying to read the instruction, report it. */
if (insn_len < 0)
{
- result = -1;
+ result = 0;
break;
}
next_pc = pc + insn_len;
- pre_insn_sp = gpr[S390_SP_REGNUM - S390_R0_REGNUM];
- pre_insn_fp = gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
- pre_insn_back_chain = back_chain;
-
- /* A special case, first --- only recognized as the very first
- instruction of the function, for signal delivery frames:
- SVC i --- system call */
- if (pc == start_pc
- && is_rr (insn, op_svc, &r1, &r2))
+ pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pre_insn_back_chain_saved_p = data->back_chain_saved_p;
+
+
+ /* LHI r1, i2 --- load halfword immediate. */
+ /* LGHI r1, i2 --- load halfword immediate (64-bit version). */
+ /* LGFI r1, i2 --- load fullword immediate. */
+ if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
+ || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
+ || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
+ data->gpr[r1] = pv_constant (i2);
+
+ /* LR r1, r2 --- load from register. */
+ /* LGR r1, r2 --- load from register (64-bit version). */
+ else if (is_rr (insn32, op_lr, &r1, &r2)
+ || is_rre (insn64, op_lgr, &r1, &r2))
+ data->gpr[r1] = data->gpr[r2];
+
+ /* L r1, d2(x2, b2) --- load. */
+ /* LY r1, d2(x2, b2) --- load (long-displacement version). */
+ /* LG r1, d2(x2, b2) --- load (64-bit version). */
+ else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
+
+ /* ST r1, d2(x2, b2) --- store. */
+ /* STY r1, d2(x2, b2) --- store (long-displacement version). */
+ /* STG r1, d2(x2, b2) --- store (64-bit version). */
+ else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
+ s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
+
+ /* STD r1, d2(x2,b2) --- store floating-point register. */
+ else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
+ s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
+
+ /* STM r1, r3, d2(b2) --- store multiple. */
+ /* STMY r1, r3, d2(b2) --- store multiple (long-displacement version). */
+ /* STMG r1, r3, d2(b2) --- store multiple (64-bit version). */
+ else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
+ || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
+ || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
{
- if (fi)
- s390_get_signal_frame_info (fi);
- break;
+ for (; r1 <= r3; r1++, d2 += data->gpr_size)
+ s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
}
-
- /* AHI r1, i2 --- add halfword immediate */
- else if (is_ri (insn, op1_ahi, op2_ahi, &r1, &i2))
- pv_add_constant (&gpr[r1], i2);
-
- /* AGHI r1, i2 --- add halfword immediate (64-bit version) */
- else if (GDB_TARGET_IS_ESAME
- && is_ri (insn, op1_aghi, op2_aghi, &r1, &i2))
- pv_add_constant (&gpr[r1], i2);
-
- /* AR r1, r2 -- add register */
- else if (is_rr (insn, op_ar, &r1, &r2))
- pv_add (&gpr[r1], &gpr[r1], &gpr[r2]);
-
- /* BASR r1, 0 --- branch and save
+ /* AHI r1, i2 --- add halfword immediate. */
+ /* AGHI r1, i2 --- add halfword immediate (64-bit version). */
+ /* AFI r1, i2 --- add fullword immediate. */
+ /* AGFI r1, i2 --- add fullword immediate (64-bit version). */
+ else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
+ || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
+ || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
+ || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
+
+ /* ALFI r1, i2 --- add logical immediate. */
+ /* ALGFI r1, i2 --- add logical immediate (64-bit version). */
+ else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
+ || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1],
+ (CORE_ADDR)i2 & 0xffffffff);
+
+ /* AR r1, r2 -- add register. */
+ /* AGR r1, r2 -- add register (64-bit version). */
+ else if (is_rr (insn32, op_ar, &r1, &r2)
+ || is_rre (insn64, op_agr, &r1, &r2))
+ data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
+
+ /* A r1, d2(x2, b2) -- add. */
+ /* AY r1, d2(x2, b2) -- add (long-displacement version). */
+ /* AG r1, d2(x2, b2) -- add (64-bit version). */
+ else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = pv_add (data->gpr[r1],
+ s390_load (data, d2, x2, b2, data->gpr_size));
+
+ /* SLFI r1, i2 --- subtract logical immediate. */
+ /* SLGFI r1, i2 --- subtract logical immediate (64-bit version). */
+ else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
+ || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1],
+ -((CORE_ADDR)i2 & 0xffffffff));
+
+ /* SR r1, r2 -- subtract register. */
+ /* SGR r1, r2 -- subtract register (64-bit version). */
+ else if (is_rr (insn32, op_sr, &r1, &r2)
+ || is_rre (insn64, op_sgr, &r1, &r2))
+ data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
+
+ /* S r1, d2(x2, b2) -- subtract. */
+ /* SY r1, d2(x2, b2) -- subtract (long-displacement version). */
+ /* SG r1, d2(x2, b2) -- subtract (64-bit version). */
+ else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = pv_subtract (data->gpr[r1],
+ s390_load (data, d2, x2, b2, data->gpr_size));
+
+ /* LA r1, d2(x2, b2) --- load address. */
+ /* LAY r1, d2(x2, b2) --- load address (long-displacement version). */
+ else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
+ || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = s390_addr (data, d2, x2, b2);
+
+ /* LARL r1, i2 --- load address relative long. */
+ else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+ data->gpr[r1] = pv_constant (pc + i2 * 2);
+
+ /* BASR r1, 0 --- branch and save.
Since r2 is zero, this saves the PC in r1, but doesn't branch. */
else if (is_rr (insn, op_basr, &r1, &r2)
&& r2 == 0)
- pv_set_to_constant (&gpr[r1], next_pc);
+ data->gpr[r1] = pv_constant (next_pc);
- /* BRAS r1, i2 --- branch relative and save */
+ /* BRAS r1, i2 --- branch relative and save. */
else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
{
- pv_set_to_constant (&gpr[r1], next_pc);
+ data->gpr[r1] = pv_constant (next_pc);
next_pc = pc + i2 * 2;
/* We'd better not interpret any backward branches. We'll
break;
}
- /* L r1, d2(x2, b2) --- load */
- else if (is_rx (insn, op_l, &r1, &d2, &x2, &b2))
- {
- struct prologue_value addr;
- struct prologue_value *stack;
-
- compute_x_addr (&addr, gpr, d2, x2, b2);
-
- /* If it's a load from an in-line constant pool, then we can
- simulate that, under the assumption that the code isn't
- going to change between the time the processor actually
- executed it creating the current frame, and the time when
- we're analyzing the code to unwind past that frame. */
- if (addr.kind == pv_constant
- && start_pc <= addr.k
- && addr.k < next_pc)
- pv_set_to_constant (&gpr[r1],
- read_memory_integer (addr.k, 4));
-
- /* If it's definitely a reference to something on the stack,
- we can do that. */
- else if (s390_on_stack (&addr, 4, gpr, spill, &back_chain, &stack)
- == pv_definite_yes)
- gpr[r1] = *stack;
-
- /* Otherwise, we don't know the value. */
- else
- pv_set_to_unknown (&gpr[r1]);
- }
-
- /* LA r1, d2(x2, b2) --- load address */
- else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2))
- compute_x_addr (&gpr[r1], gpr, d2, x2, b2);
-
- /* LARL r1, i2 --- load address relative long */
- else if (GDB_TARGET_IS_ESAME
- && is_ril (insn, op1_larl, op2_larl, &r1, &i2))
- pv_set_to_constant (&gpr[r1], pc + i2 * 2);
-
- /* LGR r1, r2 --- load from register */
- else if (GDB_TARGET_IS_ESAME
- && is_rre (insn, op_lgr, &r1, &r2))
- gpr[r1] = gpr[r2];
-
- /* LHI r1, i2 --- load halfword immediate */
- else if (is_ri (insn, op1_lhi, op2_lhi, &r1, &i2))
- pv_set_to_constant (&gpr[r1], i2);
-
- /* LGHI r1, i2 --- load halfword immediate --- 64-bit version */
- else if (is_ri (insn, op1_lghi, op2_lghi, &r1, &i2))
- pv_set_to_constant (&gpr[r1], i2);
-
- /* LR r1, r2 --- load from register */
- else if (is_rr (insn, op_lr, &r1, &r2))
- gpr[r1] = gpr[r2];
-
- /* NGR r1, r2 --- logical and --- 64-bit version */
- else if (GDB_TARGET_IS_ESAME
- && is_rre (insn, op_ngr, &r1, &r2))
- pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
-
- /* NR r1, r2 --- logical and */
- else if (is_rr (insn, op_nr, &r1, &r2))
- pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
-
- /* NGR r1, r2 --- logical and --- 64-bit version */
- else if (GDB_TARGET_IS_ESAME
- && is_rre (insn, op_ngr, &r1, &r2))
- pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
-
- /* NR r1, r2 --- logical and */
- else if (is_rr (insn, op_nr, &r1, &r2))
- pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
-
- /* S r1, d2(x2, b2) --- subtract from memory */
- else if (is_rx (insn, op_s, &r1, &d2, &x2, &b2))
- {
- struct prologue_value addr;
- struct prologue_value value;
- struct prologue_value *stack;
-
- compute_x_addr (&addr, gpr, d2, x2, b2);
-
- /* If it's a load from an in-line constant pool, then we can
- simulate that, under the assumption that the code isn't
- going to change between the time the processor actually
- executed it and the time when we're analyzing it. */
- if (addr.kind == pv_constant
- && start_pc <= addr.k
- && addr.k < pc)
- pv_set_to_constant (&value, read_memory_integer (addr.k, 4));
-
- /* If it's definitely a reference to something on the stack,
- we could do that. */
- else if (s390_on_stack (&addr, 4, gpr, spill, &back_chain, &stack)
- == pv_definite_yes)
- value = *stack;
-
- /* Otherwise, we don't know the value. */
- else
- pv_set_to_unknown (&value);
-
- pv_subtract (&gpr[r1], &gpr[r1], &value);
- }
-
- /* ST r1, d2(x2, b2) --- store */
- else if (is_rx (insn, op_st, &r1, &d2, &x2, &b2))
- {
- struct prologue_value addr;
-
- compute_x_addr (&addr, gpr, d2, x2, b2);
-
- /* The below really should be '4', not 'S390_GPR_SIZE'; this
- instruction always stores 32 bits, regardless of the full
- size of the GPR. */
- if (s390_store (&addr, 4, &gpr[r1], gpr, spill, &back_chain)
- == pv_maybe)
- /* If we can't be sure that it's *not* a store to
- something we're tracing, then we would have to mark all
- our memory as unknown --- after all, it *could* be a
- store to any of them --- so we might as well just stop
- interpreting. */
- break;
- }
-
- /* STD r1, d2(x2,b2) --- store floating-point register */
- else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
- {
- struct prologue_value addr;
-
- compute_x_addr (&addr, gpr, d2, x2, b2);
-
- if (s390_store (&addr, 8, &fpr[r1], gpr, spill, &back_chain)
- == pv_maybe)
- /* If we can't be sure that it's *not* a store to
- something we're tracing, then we would have to mark all
- our memory as unknown --- after all, it *could* be a
- store to any of them --- so we might as well just stop
- interpreting. */
- break;
- }
-
- /* STG r1, d2(x2, b2) --- 64-bit store */
- else if (GDB_TARGET_IS_ESAME
- && is_rxe (insn, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
- {
- struct prologue_value addr;
-
- compute_x_addr (&addr, gpr, d2, x2, b2);
-
- /* The below really should be '8', not 'S390_GPR_SIZE'; this
- instruction always stores 64 bits, regardless of the full
- size of the GPR. */
- if (s390_store (&addr, 8, &gpr[r1], gpr, spill, &back_chain)
- == pv_maybe)
- /* If we can't be sure that it's *not* a store to
- something we're tracing, then we would have to mark all
- our memory as unknown --- after all, it *could* be a
- store to any of them --- so we might as well just stop
- interpreting. */
- break;
- }
-
- /* STM r1, r3, d2(b2) --- store multiple */
- else if (is_rs (insn, op_stm, &r1, &r3, &d2, &b2))
- {
- int regnum;
- int offset;
- struct prologue_value addr;
-
- for (regnum = r1, offset = 0;
- regnum <= r3;
- regnum++, offset += 4)
- {
- compute_x_addr (&addr, gpr, d2 + offset, 0, b2);
-
- if (s390_store (&addr, 4, &gpr[regnum], gpr, spill, &back_chain)
- == pv_maybe)
- /* If we can't be sure that it's *not* a store to
- something we're tracing, then we would have to mark all
- our memory as unknown --- after all, it *could* be a
- store to any of them --- so we might as well just stop
- interpreting. */
- break;
- }
-
- /* If we left the loop early, we should stop interpreting
- altogether. */
- if (regnum <= r3)
- break;
- }
-
- /* STMG r1, r3, d2(b2) --- store multiple, 64-bit */
- else if (GDB_TARGET_IS_ESAME
- && is_rse (insn, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
- {
- int regnum;
- int offset;
- struct prologue_value addr;
-
- for (regnum = r1, offset = 0;
- regnum <= r3;
- regnum++, offset += 8)
- {
- compute_x_addr (&addr, gpr, d2 + offset, 0, b2);
-
- if (s390_store (&addr, 8, &gpr[regnum], gpr, spill, &back_chain)
- == pv_maybe)
- /* If we can't be sure that it's *not* a store to
- something we're tracing, then we would have to mark all
- our memory as unknown --- after all, it *could* be a
- store to any of them --- so we might as well just stop
- interpreting. */
- break;
- }
-
- /* If we left the loop early, we should stop interpreting
- altogether. */
- if (regnum <= r3)
- break;
- }
+ /* Terminate search when hitting any other branch instruction. */
+ else if (is_rr (insn, op_basr, &r1, &r2)
+ || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
+ || is_rr (insn, op_bcr, &r1, &r2)
+ || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
+ || is_ri (insn, op1_brc, op2_brc, &r1, &i2)
+ || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
+ || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
+ break;
else
/* An instruction we don't know how to simulate. The only
safe thing to do would be to set every value we're tracking
- to 'unknown'. Instead, we'll be optimistic: we just stop
- interpreting, and assume that the machine state we've got
- now is good enough for unwinding the stack. */
- break;
+ to 'unknown'. Instead, we'll be optimistic: we assume that
+ we *can* interpret every instruction that the compiler uses
+ to manipulate any of the data we're interested in here --
+ then we can just ignore anything else. */
+ ;
/* Record the address after the last instruction that changed
the FP, SP, or backlink. Ignore instructions that changed
restore instructions. (The back chain is never restored,
just popped.) */
{
- struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM];
- struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
- if ((! pv_is_identical (&pre_insn_sp, sp)
- && ! pv_is_register (sp, S390_SP_REGNUM, 0))
- || (! pv_is_identical (&pre_insn_fp, fp)
- && ! pv_is_register (fp, S390_FRAME_REGNUM, 0))
- || ! pv_is_identical (&pre_insn_back_chain, &back_chain))
- after_last_frame_setup_insn = next_pc;
- }
- }
-
- /* Okay, now gpr[], fpr[], spill[], and back_chain reflect the state
- of the machine as of the first instruction we couldn't interpret
- (hopefully the first non-prologue instruction). */
- {
- /* The size of the frame, or (CORE_ADDR) -1 if we couldn't figure
- that out. */
- CORE_ADDR frame_size = -1;
-
- /* The value the SP had upon entry to the function, or
- (CORE_ADDR) -1 if we can't figure that out. */
- CORE_ADDR original_sp = -1;
-
- /* Are we using S390_FRAME_REGNUM as a frame pointer register? */
- int using_frame_pointer = 0;
-
- /* If S390_FRAME_REGNUM is some constant offset from the SP, then
- that strongly suggests that we're going to use that as our
- frame pointer register, not the SP. */
- {
- struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
-
- if (fp->kind == pv_register
- && fp->reg == S390_SP_REGNUM)
- using_frame_pointer = 1;
- }
-
- /* If we were given a frame_info structure, we may be able to use
- the frame's base address to figure out the actual value of the
- original SP. */
- if (fi && get_frame_base (fi))
- {
- int frame_base_regno;
- struct prologue_value *frame_base;
-
- /* The meaning of the frame base depends on whether the
- function uses a frame pointer register other than the SP or
- not (see s390_read_fp):
- - If the function does use a frame pointer register other
- than the SP, then the frame base is that register's
- value.
- - If the function doesn't use a frame pointer, then the
- frame base is the SP itself.
- We're duplicating some of the logic of s390_fp_regnum here,
- but we don't want to call that, because it would just do
- exactly the same analysis we've already done above. */
- if (using_frame_pointer)
- frame_base_regno = S390_FRAME_REGNUM;
- else
- frame_base_regno = S390_SP_REGNUM;
-
- frame_base = &gpr[frame_base_regno - S390_R0_REGNUM];
-
- /* We know the frame base address; if the value of whatever
- register it came from is a constant offset from the
- original SP, then we can reconstruct the original SP just
- by subtracting off that constant. */
- if (frame_base->kind == pv_register
- && frame_base->reg == S390_SP_REGNUM)
- original_sp = get_frame_base (fi) - frame_base->k;
+ if ((! pv_is_identical (pre_insn_sp, sp)
+ && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
+ && sp.kind != pvk_unknown)
+ || (! pv_is_identical (pre_insn_fp, fp)
+ && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
+ && fp.kind != pvk_unknown)
+ || pre_insn_back_chain_saved_p != data->back_chain_saved_p)
+ result = next_pc;
}
-
- /* If the analysis said that the current SP value is the original
- value less some constant, then that constant is the frame size. */
- {
- struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM];
-
- if (sp->kind == pv_register
- && sp->reg == S390_SP_REGNUM)
- frame_size = -sp->k;
}
- /* If we knew other registers' current values, we could check if
- the analysis said any of those were related to the original SP
- value, too. But for now, we'll just punt. */
+ /* Record where all the registers were saved. */
+ pv_area_scan (data->stack, s390_check_for_saved, data);
- /* If the caller passed in an 'extra info' structure, fill in the
- parts we can. */
- if (fextra_info)
- {
- if (init_extra_info || ! fextra_info->initialised)
- {
- s390_memset_extra_info (fextra_info);
- fextra_info->function_start = start_pc;
- fextra_info->initialised = 1;
- }
-
- if (frame_size != -1)
- {
- fextra_info->stack_bought_valid = 1;
- fextra_info->stack_bought = frame_size;
- }
-
- /* Assume everything was okay, and indicate otherwise when we
- find something amiss. */
- fextra_info->good_prologue = 1;
-
- if (using_frame_pointer)
- /* Actually, nobody cares about the exact PC, so any
- non-zero value will do here. */
- fextra_info->frame_pointer_saved_pc = 1;
-
- /* If we weren't able to find the size of the frame, or find
- the original sp based on actual current register values,
- then we're not going to be able to unwind this frame.
-
- (If we're just doing prologue analysis to set a breakpoint,
- then frame_size might be known, but original_sp unknown; if
- we're analyzing a real frame which uses alloca, then
- original_sp might be known (from the frame pointer
- register), but the frame size might be unknown.) */
- if (original_sp == -1 && frame_size == -1)
- fextra_info->good_prologue = 0;
-
- if (fextra_info->good_prologue)
- fextra_info->skip_prologue_function_start
- = after_last_frame_setup_insn;
- else
- /* If the prologue was too complex for us to make sense of,
- then perhaps it's better to just not skip anything at
- all. */
- fextra_info->skip_prologue_function_start = start_pc;
- }
-
- /* Indicate where registers were saved on the stack, if:
- - the caller seems to want to know,
- - the caller provided an actual SP, and
- - the analysis gave us enough information to actually figure it
- out. */
- if (fi
- && deprecated_get_frame_saved_regs (fi)
- && original_sp != -1)
- {
- int slot_num;
- CORE_ADDR slot_addr;
- CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi);
-
- /* Scan the spill array; if a spill slot says it holds the
- original value of some register, then record that slot's
- address as the place that register was saved.
-
- Just for kicks, note that, even if registers aren't saved
- in their officially-sanctioned slots, this will still work
- --- we know what really got put where. */
-
- /* First, the slots for r2 -- r15. */
- for (slot_num = 0, slot_addr = original_sp + 2 * S390_GPR_SIZE;
- slot_num < 14;
- slot_num++, slot_addr += S390_GPR_SIZE)
- {
- struct prologue_value *slot = &spill[slot_num];
-
- if (slot->kind == pv_register
- && slot->k == 0)
- saved_regs[slot->reg] = slot_addr;
- }
-
- /* Then, the slots for f0, f2, f4, and f6. They're a
- different size. */
- for (slot_num = 14, slot_addr = original_sp + 16 * S390_GPR_SIZE;
- slot_num < S390_NUM_SPILL_SLOTS;
- slot_num++, slot_addr += S390_FPR_SIZE)
- {
- struct prologue_value *slot = &spill[slot_num];
-
- if (slot->kind == pv_register
- && slot->k == 0)
- saved_regs[slot->reg] = slot_addr;
- }
-
- /* The stack pointer's element of saved_regs[] is special. */
- saved_regs[S390_SP_REGNUM] = original_sp;
- }
- }
+ free_pv_area (data->stack);
+ data->stack = NULL;
return result;
}
+/* Advance PC across any function entry prologue instructions to reach
+ some "real" code. */
+static CORE_ADDR
+s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ struct s390_prologue_data data;
+ CORE_ADDR skip_pc;
+ skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
+ return skip_pc ? skip_pc : pc;
+}
+
/* Return true if we are in the functin's epilogue, i.e. after the
instruction that destroyed the function's stack frame. */
static int
int d2;
if (word_size == 4
- && !read_memory_nobpt (pc - 4, insn, 4)
+ && !target_read_memory (pc - 4, insn, 4)
&& is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
&& r3 == S390_SP_REGNUM - S390_R0_REGNUM)
return 1;
+ if (word_size == 4
+ && !target_read_memory (pc - 6, insn, 6)
+ && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
if (word_size == 8
- && !read_memory_nobpt (pc - 6, insn, 6)
- && is_rse (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
+ && !target_read_memory (pc - 6, insn, 6)
+ && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
&& r3 == S390_SP_REGNUM - S390_R0_REGNUM)
return 1;
return 0;
}
-static int
-s390_check_function_end (CORE_ADDR pc)
-{
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- int regidx, instrlen;
+/* Displaced stepping. */
- instrlen = s390_readinstruction (instr, pc);
- if (instrlen < 0)
- return -1;
- /* check for BR */
- if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf)
- return 0;
- regidx = instr[1] & 0xf;
- /* Check for LMG or LG */
- instrlen =
- s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4));
- if (instrlen < 0)
- return -1;
- if (GDB_TARGET_IS_ESAME)
+/* Fix up the state of registers and memory after having single-stepped
+ a displaced instruction. */
+static void
+s390_displaced_step_fixup (struct gdbarch *gdbarch,
+ struct displaced_step_closure *closure,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs)
+{
+ /* Since we use simple_displaced_step_copy_insn, our closure is a
+ copy of the instruction. */
+ gdb_byte *insn = (gdb_byte *) closure;
+ static int s390_instrlen[] = { 2, 4, 4, 6 };
+ int insnlen = s390_instrlen[insn[0] >> 6];
+
+ /* Fields for various kinds of instructions. */
+ unsigned int b2, r1, r2, x2, r3;
+ int i2, d2;
+
+ /* Get current PC and addressing mode bit. */
+ CORE_ADDR pc = regcache_read_pc (regs);
+ ULONGEST amode = 0;
+
+ if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
{
+ regcache_cooked_read_unsigned (regs, S390_PSWA_REGNUM, &amode);
+ amode &= 0x80000000;
+ }
- if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4)
- return 0;
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: (s390) fixup (%s, %s) pc %s amode 0x%x\n",
+ paddress (gdbarch, from), paddress (gdbarch, to),
+ paddress (gdbarch, pc), (int) amode);
+
+ /* Handle absolute branch and save instructions. */
+ if (is_rr (insn, op_basr, &r1, &r2)
+ || is_rx (insn, op_bas, &r1, &d2, &x2, &b2))
+ {
+ /* Recompute saved return address in R1. */
+ regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
+ amode | (from + insnlen));
}
- else if (instrlen != 4 || instr[0] != 0x98)
+
+ /* Handle absolute branch instructions. */
+ else if (is_rr (insn, op_bcr, &r1, &r2)
+ || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
+ || is_rr (insn, op_bctr, &r1, &r2)
+ || is_rre (insn, op_bctgr, &r1, &r2)
+ || is_rx (insn, op_bct, &r1, &d2, &x2, &b2)
+ || is_rxy (insn, op1_bctg, op2_brctg, &r1, &d2, &x2, &b2)
+ || is_rs (insn, op_bxh, &r1, &r3, &d2, &b2)
+ || is_rsy (insn, op1_bxhg, op2_bxhg, &r1, &r3, &d2, &b2)
+ || is_rs (insn, op_bxle, &r1, &r3, &d2, &b2)
+ || is_rsy (insn, op1_bxleg, op2_bxleg, &r1, &r3, &d2, &b2))
{
- return 0;
+ /* Update PC iff branch was *not* taken. */
+ if (pc == to + insnlen)
+ regcache_write_pc (regs, from + insnlen);
}
- if ((instr[2] >> 4) != 0xf)
- return 0;
- if (regidx == 14)
- return 1;
- instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8));
- if (instrlen < 0)
- return -1;
- if (GDB_TARGET_IS_ESAME)
+
+ /* Handle PC-relative branch and save instructions. */
+ else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)
+ || is_ril (insn, op1_brasl, op2_brasl, &r1, &i2))
{
- /* Check for LG */
- if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4)
- return 0;
+ /* Update PC. */
+ regcache_write_pc (regs, pc - to + from);
+ /* Recompute saved return address in R1. */
+ regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
+ amode | (from + insnlen));
}
- else
+
+ /* Handle PC-relative branch instructions. */
+ else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2)
+ || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
+ || is_ri (insn, op1_brct, op2_brct, &r1, &i2)
+ || is_ri (insn, op1_brctg, op2_brctg, &r1, &i2)
+ || is_rsi (insn, op_brxh, &r1, &r3, &i2)
+ || is_rie (insn, op1_brxhg, op2_brxhg, &r1, &r3, &i2)
+ || is_rsi (insn, op_brxle, &r1, &r3, &i2)
+ || is_rie (insn, op1_brxlg, op2_brxlg, &r1, &r3, &i2))
{
- /* Check for L */
- if (instrlen != 4 || instr[0] != 0x58)
- return 0;
+ /* Update PC. */
+ regcache_write_pc (regs, pc - to + from);
}
- if (instr[2] >> 4 != 0xf)
- return 0;
- if (instr[1] >> 4 != regidx)
- return 0;
- return 1;
+
+ /* Handle LOAD ADDRESS RELATIVE LONG. */
+ else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+ {
+ /* Recompute output address in R1. */
+ regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
+ amode | (from + insnlen + i2*2));
+ }
+
+ /* If we executed a breakpoint instruction, point PC right back at it. */
+ else if (insn[0] == 0x0 && insn[1] == 0x1)
+ regcache_write_pc (regs, from);
+
+ /* For any other insn, PC points right after the original instruction. */
+ else
+ regcache_write_pc (regs, from + insnlen);
}
-static CORE_ADDR
-s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi)
+/* Normal stack frames. */
+
+struct s390_unwind_cache {
+
+ CORE_ADDR func;
+ CORE_ADDR frame_base;
+ CORE_ADDR local_base;
+
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+static int
+s390_prologue_frame_unwind_cache (struct frame_info *this_frame,
+ struct s390_unwind_cache *info)
{
- CORE_ADDR function_start, test_function_start;
- int loop_cnt, err, function_end;
- struct frame_extra_info fextra_info;
- function_start = get_pc_function_start (pc);
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_prologue_data data;
+ pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ int i;
+ CORE_ADDR cfa;
+ CORE_ADDR func;
+ CORE_ADDR result;
+ ULONGEST reg;
+ CORE_ADDR prev_sp;
+ int frame_pointer;
+ int size;
+ struct frame_info *next_frame;
+
+ /* Try to find the function start address. If we can't find it, we don't
+ bother searching for it -- with modern compilers this would be mostly
+ pointless anyway. Trust that we'll either have valid DWARF-2 CFI data
+ or else a valid backchain ... */
+ func = get_frame_func (this_frame);
+ if (!func)
+ return 0;
+
+ /* Try to analyze the prologue. */
+ result = s390_analyze_prologue (gdbarch, func,
+ get_frame_pc (this_frame), &data);
+ if (!result)
+ return 0;
- if (function_start == 0)
+ /* If this was successful, we should have found the instruction that
+ sets the stack pointer register to the previous value of the stack
+ pointer minus the frame size. */
+ if (!pv_is_register (*sp, S390_SP_REGNUM))
+ return 0;
+
+ /* A frame size of zero at this point can mean either a real
+ frameless function, or else a failure to find the prologue.
+ Perform some sanity checks to verify we really have a
+ frameless function. */
+ if (sp->k == 0)
{
- test_function_start = pc;
- if (test_function_start & 1)
- return 0; /* This has to be bogus */
- loop_cnt = 0;
- do
+ /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame
+ size zero. This is only possible if the next frame is a sentinel
+ frame, a dummy frame, or a signal trampoline frame. */
+ /* FIXME: cagney/2004-05-01: This sanity check shouldn't be
+ needed, instead the code should simpliy rely on its
+ analysis. */
+ next_frame = get_next_frame (this_frame);
+ while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
+ next_frame = get_next_frame (next_frame);
+ if (next_frame
+ && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
+ return 0;
+
+ /* If we really have a frameless function, %r14 must be valid
+ -- in particular, it must point to a different function. */
+ reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);
+ reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
+ if (get_pc_function_start (reg) == func)
{
+ /* However, there is one case where it *is* valid for %r14
+ to point to the same function -- if this is a recursive
+ call, and we have stopped in the prologue *before* the
+ stack frame was allocated.
- err =
- s390_get_frame_info (test_function_start, &fextra_info, fi, 1);
- loop_cnt++;
- test_function_start -= 2;
- function_end = s390_check_function_end (test_function_start);
+ Recognize this case by looking ahead a bit ... */
+
+ struct s390_prologue_data data2;
+ pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+
+ if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
+ && pv_is_register (*sp, S390_SP_REGNUM)
+ && sp->k != 0))
+ return 0;
}
- while (!(function_end == 1 || err || loop_cnt >= 4096 ||
- (fextra_info.good_prologue)));
- if (fextra_info.good_prologue)
- function_start = fextra_info.function_start;
- else if (function_end == 1)
- function_start = test_function_start;
}
- return function_start;
-}
-static int
-s390_frameless_function_invocation (struct frame_info *fi)
-{
- struct frame_extra_info fextra_info, *fextra_info_ptr;
- int frameless = 0;
+ /* OK, we've found valid prologue data. */
+ size = -sp->k;
- if (get_next_frame (fi) == NULL) /* no may be frameless */
+ /* If the frame pointer originally also holds the same value
+ as the stack pointer, we're probably using it. If it holds
+ some other value -- even a constant offset -- it is most
+ likely used as temp register. */
+ if (pv_is_identical (*sp, *fp))
+ frame_pointer = S390_FRAME_REGNUM;
+ else
+ frame_pointer = S390_SP_REGNUM;
+
+ /* If we've detected a function with stack frame, we'll still have to
+ treat it as frameless if we're currently within the function epilog
+ code at a point where the frame pointer has already been restored.
+ This can only happen in an innermost frame. */
+ /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
+ instead the code should simpliy rely on its analysis. */
+ next_frame = get_next_frame (this_frame);
+ while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
+ next_frame = get_next_frame (next_frame);
+ if (size > 0
+ && (next_frame == NULL
+ || get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))
{
- if (get_frame_extra_info (fi))
- fextra_info_ptr = get_frame_extra_info (fi);
- else
+ /* See the comment in s390_in_function_epilogue_p on why this is
+ not completely reliable ... */
+ if (s390_in_function_epilogue_p (gdbarch, get_frame_pc (this_frame)))
{
- fextra_info_ptr = &fextra_info;
- s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- fextra_info_ptr, fi, 1);
+ memset (&data, 0, sizeof (data));
+ size = 0;
+ frame_pointer = S390_SP_REGNUM;
}
- frameless = (fextra_info_ptr->stack_bought_valid
- && fextra_info_ptr->stack_bought == 0);
}
- return frameless;
-}
+ /* Once we know the frame register and the frame size, we can unwind
+ the current value of the frame register from the next frame, and
+ add back the frame size to arrive that the previous frame's
+ stack pointer value. */
+ prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;
+ cfa = prev_sp + 16*word_size + 32;
+ /* Set up ABI call-saved/call-clobbered registers. */
+ for (i = 0; i < S390_NUM_REGS; i++)
+ if (!s390_register_call_saved (gdbarch, i))
+ trad_frame_set_unknown (info->saved_regs, i);
+
+ /* CC is always call-clobbered. */
+ trad_frame_set_unknown (info->saved_regs, tdep->cc_regnum);
+
+ /* Record the addresses of all register spill slots the prologue parser
+ has recognized. Consider only registers defined as call-saved by the
+ ABI; for call-clobbered registers the parser may have recognized
+ spurious stores. */
+
+ for (i = 0; i < 16; i++)
+ if (s390_register_call_saved (gdbarch, S390_R0_REGNUM + i)
+ && data.gpr_slot[i] != 0)
+ info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
+
+ for (i = 0; i < 16; i++)
+ if (s390_register_call_saved (gdbarch, S390_F0_REGNUM + i)
+ && data.fpr_slot[i] != 0)
+ info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
+
+ /* Function return will set PC to %r14. */
+ info->saved_regs[tdep->pc_regnum] = info->saved_regs[S390_RETADDR_REGNUM];
+
+ /* In frameless functions, we unwind simply by moving the return
+ address to the PC. However, if we actually stored to the
+ save area, use that -- we might only think the function frameless
+ because we're in the middle of the prologue ... */
+ if (size == 0
+ && !trad_frame_addr_p (info->saved_regs, tdep->pc_regnum))
+ {
+ info->saved_regs[tdep->pc_regnum].realreg = S390_RETADDR_REGNUM;
+ }
-static int
-s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi,
- CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc)
-{
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- int instrlen;
- CORE_ADDR scontext;
- int retval = 0;
- CORE_ADDR orig_sp;
- CORE_ADDR temp_sregs;
-
- scontext = temp_sregs = 0;
-
- instrlen = s390_readinstruction (instr, pc);
- if (sigcaller_pc)
- *sigcaller_pc = 0;
- if (((instrlen == S390_SYSCALL_SIZE) &&
- (instr[0] == S390_SYSCALL_OPCODE)) &&
- ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn)))
+ /* Another sanity check: unless this is a frameless function,
+ we should have found spill slots for SP and PC.
+ If not, we cannot unwind further -- this happens e.g. in
+ libc's thread_start routine. */
+ if (size > 0)
{
- if (sighandler_fi)
- {
- if (s390_frameless_function_invocation (sighandler_fi))
- orig_sp = get_frame_base (sighandler_fi);
- else
- orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (get_frame_base (sighandler_fi),
- S390_GPR_SIZE));
- if (orig_sp && sigcaller_pc)
- {
- scontext = orig_sp + S390_SIGNAL_FRAMESIZE;
- if (pc == scontext && instr[1] == s390_NR_rt_sigreturn)
- {
- /* We got a new style rt_signal */
- /* get address of read ucontext->uc_mcontext */
- temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ?
- S390X_UC_MCONTEXT_OFFSET :
- S390_UC_MCONTEXT_OFFSET);
- }
- else
- {
- /* read sigcontext->sregs */
- temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (scontext
- +
- (GDB_TARGET_IS_ESAME
- ?
- S390X_SIGCONTEXT_SREGS_OFFSET
- :
- S390_SIGCONTEXT_SREGS_OFFSET),
- S390_GPR_SIZE));
-
- }
- /* read sigregs->psw.addr */
- *sigcaller_pc =
- ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (temp_sregs +
- DEPRECATED_REGISTER_BYTE (S390_PSWA_REGNUM),
- S390_GPR_SIZE));
- }
- }
- retval = 1;
+ if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
+ || !trad_frame_addr_p (info->saved_regs, tdep->pc_regnum))
+ prev_sp = -1;
}
- if (sregs)
- *sregs = temp_sregs;
- return retval;
+
+ /* We use the current value of the frame register as local_base,
+ and the top of the register save area as frame_base. */
+ if (prev_sp != -1)
+ {
+ info->frame_base = prev_sp + 16*word_size + 32;
+ info->local_base = prev_sp - size;
+ }
+
+ info->func = func;
+ return 1;
}
-/*
- We need to do something better here but this will keep us out of trouble
- for the moment.
- For some reason the blockframe.c calls us with fi->next->fromleaf
- so this seems of little use to us. */
-static CORE_ADDR
-s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi)
+static void
+s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
+ struct s390_unwind_cache *info)
{
- CORE_ADDR sigcaller_pc;
- CORE_ADDR pc = 0;
- if (next_fromleaf)
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR backchain;
+ ULONGEST reg;
+ LONGEST sp;
+ int i;
+
+ /* Set up ABI call-saved/call-clobbered registers. */
+ for (i = 0; i < S390_NUM_REGS; i++)
+ if (!s390_register_call_saved (gdbarch, i))
+ trad_frame_set_unknown (info->saved_regs, i);
+
+ /* CC is always call-clobbered. */
+ trad_frame_set_unknown (info->saved_regs, tdep->cc_regnum);
+
+ /* Get the backchain. */
+ reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ backchain = read_memory_unsigned_integer (reg, word_size, byte_order);
+
+ /* A zero backchain terminates the frame chain. As additional
+ sanity check, let's verify that the spill slot for SP in the
+ save area pointed to by the backchain in fact links back to
+ the save area. */
+ if (backchain != 0
+ && safe_read_memory_integer (backchain + 15*word_size,
+ word_size, byte_order, &sp)
+ && (CORE_ADDR)sp == backchain)
{
- pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
- /* fix signal handlers */
+ /* We don't know which registers were saved, but it will have
+ to be at least %r14 and %r15. This will allow us to continue
+ unwinding, but other prev-frame registers may be incorrect ... */
+ info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
+ info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
+
+ /* Function return will set PC to %r14. */
+ info->saved_regs[tdep->pc_regnum]
+ = info->saved_regs[S390_RETADDR_REGNUM];
+
+ /* We use the current value of the frame register as local_base,
+ and the top of the register save area as frame_base. */
+ info->frame_base = backchain + 16*word_size + 32;
+ info->local_base = reg;
}
- else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi)))
- pc = s390_frame_saved_pc_nofix (get_next_frame (fi));
- if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi))
- && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc))
+
+ info->func = get_frame_pc (this_frame);
+}
+
+static struct s390_unwind_cache *
+s390_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct s390_unwind_cache *info;
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+
+ info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+ info->func = -1;
+ info->frame_base = -1;
+ info->local_base = -1;
+
+ /* Try to use prologue analysis to fill the unwind cache.
+ If this fails, fall back to reading the stack backchain. */
+ if (!s390_prologue_frame_unwind_cache (this_frame, info))
+ s390_backchain_frame_unwind_cache (this_frame, info);
+
+ return info;
+}
+
+static void
+s390_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_prologue_cache);
+
+ if (info->frame_base == -1)
+ return;
+
+ *this_id = frame_id_build (info->frame_base, info->func);
+}
+
+static struct value *
+s390_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_prologue_cache);
+
+ /* Unwind full GPRs to show at least the lower halves (as the
+ upper halves are undefined). */
+ if (tdep->gpr_full_regnum != -1
+ && regnum >= tdep->gpr_full_regnum
+ && regnum < tdep->gpr_full_regnum + 16)
{
- pc = sigcaller_pc;
+ int reg = regnum - tdep->gpr_full_regnum + S390_R0_REGNUM;
+ struct value *val, *newval;
+
+ val = trad_frame_get_prev_register (this_frame, info->saved_regs, reg);
+ newval = value_cast (register_type (gdbarch, regnum), val);
+ if (value_optimized_out (val))
+ set_value_optimized_out (newval, 1);
+
+ return newval;
}
- return pc;
+
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static const struct frame_unwind s390_frame_unwind = {
+ NORMAL_FRAME,
+ s390_frame_this_id,
+ s390_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+
+
+/* Code stubs and their stack frames. For things like PLTs and NULL
+ function calls (where there is no true frame and the return address
+ is in the RETADDR register). */
+
+struct s390_stub_unwind_cache
+{
+ CORE_ADDR frame_base;
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+static struct s390_stub_unwind_cache *
+s390_stub_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_stub_unwind_cache *info;
+ ULONGEST reg;
+
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+
+ info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ /* The return address is in register %r14. */
+ info->saved_regs[tdep->pc_regnum].realreg = S390_RETADDR_REGNUM;
+
+ /* Retrieve stack pointer and determine our frame base. */
+ reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ info->frame_base = reg + 16*word_size + 32;
+
+ return info;
+}
+
+static void
+s390_stub_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct s390_stub_unwind_cache *info
+ = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
+ *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
}
-static void
-s390_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+static struct value *
+s390_stub_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct s390_stub_unwind_cache *info
+ = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static int
+s390_stub_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ CORE_ADDR addr_in_block;
+ bfd_byte insn[S390_MAX_INSTR_SIZE];
+
+ /* If the current PC points to non-readable memory, we assume we
+ have trapped due to an invalid function pointer call. We handle
+ the non-existing current function like a PLT stub. */
+ addr_in_block = get_frame_address_in_block (this_frame);
+ if (in_plt_section (addr_in_block, NULL)
+ || s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)
+ return 1;
+ return 0;
+}
+
+static const struct frame_unwind s390_stub_frame_unwind = {
+ NORMAL_FRAME,
+ s390_stub_frame_this_id,
+ s390_stub_frame_prev_register,
+ NULL,
+ s390_stub_frame_sniffer
+};
+
+
+/* Signal trampoline stack frames. */
+
+struct s390_sigtramp_unwind_cache {
+ CORE_ADDR frame_base;
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+static struct s390_sigtramp_unwind_cache *
+s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
- if (get_frame_pc (fi))
- s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- get_frame_extra_info (fi), fi, 1);
- else
- s390_memset_extra_info (get_frame_extra_info (fi));
-}
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct s390_sigtramp_unwind_cache *info;
+ ULONGEST this_sp, prev_sp;
+ CORE_ADDR next_ra, next_cfa, sigreg_ptr, sigreg_high_off;
+ ULONGEST pswm;
+ int i;
-/* If saved registers of frame FI are not known yet, read and cache them.
- &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL,
- in which case the framedata are read. */
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
-static void
-s390_frame_init_saved_regs (struct frame_info *fi)
-{
+ info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- int quick;
+ this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ next_ra = get_frame_pc (this_frame);
+ next_cfa = this_sp + 16*word_size + 32;
- if (deprecated_get_frame_saved_regs (fi) == NULL)
+ /* New-style RT frame:
+ retcode + alignment (8 bytes)
+ siginfo (128 bytes)
+ ucontext (contains sigregs at offset 5 words) */
+ if (next_ra == next_cfa)
{
- /* zalloc memsets the saved regs */
- frame_saved_regs_zalloc (fi);
- if (get_frame_pc (fi))
- {
- quick = (get_frame_extra_info (fi)
- && get_frame_extra_info (fi)->initialised
- && get_frame_extra_info (fi)->good_prologue);
- s390_get_frame_info (quick
- ? get_frame_extra_info (fi)->function_start
- : s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- get_frame_extra_info (fi), fi, !quick);
- }
+ sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
+ /* sigregs are followed by uc_sigmask (8 bytes), then by the
+ upper GPR halves if present. */
+ sigreg_high_off = 8;
}
-}
+ /* Old-style RT frame and all non-RT frames:
+ old signal mask (8 bytes)
+ pointer to sigregs */
+ else
+ {
+ sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8,
+ word_size, byte_order);
+ /* sigregs are followed by signo (4 bytes), then by the
+ upper GPR halves if present. */
+ sigreg_high_off = 4;
+ }
+ /* The sigregs structure looks like this:
+ long psw_mask;
+ long psw_addr;
+ long gprs[16];
+ int acrs[16];
+ int fpc;
+ int __pad;
+ double fprs[16]; */
+
+ /* PSW mask and address. */
+ info->saved_regs[S390_PSWM_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
+ info->saved_regs[S390_PSWA_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
+
+ /* Point PC to PSWA as well. */
+ info->saved_regs[tdep->pc_regnum] = info->saved_regs[S390_PSWA_REGNUM];
+
+ /* Extract CC from PSWM. */
+ pswm = read_memory_unsigned_integer (
+ info->saved_regs[S390_PSWM_REGNUM].addr,
+ word_size, byte_order);
+ trad_frame_set_value (info->saved_regs, tdep->cc_regnum,
+ (pswm >> (8 * word_size - 20)) & 3);
+
+ /* Then the GPRs. */
+ for (i = 0; i < 16; i++)
+ {
+ info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
+ }
-static CORE_ADDR
-s390_frame_saved_pc_nofix (struct frame_info *fi)
-{
- if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->saved_pc_valid)
- return get_frame_extra_info (fi)->saved_pc;
+ /* Then the ACRs. */
+ for (i = 0; i < 16; i++)
+ {
+ info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 4;
+ }
- if (deprecated_generic_find_dummy_frame (get_frame_pc (fi),
- get_frame_base (fi)))
- return deprecated_read_register_dummy (get_frame_pc (fi),
- get_frame_base (fi), S390_PC_REGNUM);
+ /* The floating-point control word. */
+ info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += 8;
- s390_frame_init_saved_regs (fi);
- if (get_frame_extra_info (fi))
+ /* And finally the FPRs. */
+ for (i = 0; i < 16; i++)
{
- get_frame_extra_info (fi)->saved_pc_valid = 1;
- if (get_frame_extra_info (fi)->good_prologue
- && deprecated_get_frame_saved_regs (fi)[S390_RETADDR_REGNUM])
- get_frame_extra_info (fi)->saved_pc
- = ADDR_BITS_REMOVE (read_memory_integer
- (deprecated_get_frame_saved_regs (fi)[S390_RETADDR_REGNUM],
- S390_GPR_SIZE));
- else
- get_frame_extra_info (fi)->saved_pc
- = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
- return get_frame_extra_info (fi)->saved_pc;
+ info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 8;
}
- return 0;
-}
-static CORE_ADDR
-s390_frame_saved_pc (struct frame_info *fi)
-{
- CORE_ADDR saved_pc = 0, sig_pc;
+ /* If we have them, the GPR upper halves are appended at the end. */
+ sigreg_ptr += sigreg_high_off;
+ if (tdep->gpr_full_regnum != -1)
+ for (i = 0; i < 16; i++)
+ {
+ info->saved_regs[S390_R0_UPPER_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 4;
+ }
- if (get_frame_extra_info (fi)
- && get_frame_extra_info (fi)->sig_fixed_saved_pc_valid)
- return get_frame_extra_info (fi)->sig_fixed_saved_pc;
- saved_pc = s390_frame_saved_pc_nofix (fi);
+ /* Provide read-only copies of the full registers. */
+ if (tdep->gpr_full_regnum != -1)
+ for (i = 0; i < 16; i++)
+ {
+ ULONGEST low, high;
+ low = read_memory_unsigned_integer (
+ info->saved_regs[S390_R0_REGNUM + i].addr,
+ 4, byte_order);
+ high = read_memory_unsigned_integer (
+ info->saved_regs[S390_R0_UPPER_REGNUM + i].addr,
+ 4, byte_order);
+
+ trad_frame_set_value (info->saved_regs, tdep->gpr_full_regnum + i,
+ (high << 32) | low);
+ }
- if (get_frame_extra_info (fi))
- {
- get_frame_extra_info (fi)->sig_fixed_saved_pc_valid = 1;
- if (saved_pc)
- {
- if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc))
- saved_pc = sig_pc;
- }
- get_frame_extra_info (fi)->sig_fixed_saved_pc = saved_pc;
- }
- return saved_pc;
-}
+ /* Restore the previous frame's SP. */
+ prev_sp = read_memory_unsigned_integer (
+ info->saved_regs[S390_SP_REGNUM].addr,
+ word_size, byte_order);
+ /* Determine our frame base. */
+ info->frame_base = prev_sp + 16*word_size + 32;
+ return info;
+}
+static void
+s390_sigtramp_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct s390_sigtramp_unwind_cache *info
+ = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+ *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
+}
-/* We want backtraces out of signal handlers so we don't set
- (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */
+static struct value *
+s390_sigtramp_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct s390_sigtramp_unwind_cache *info
+ = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
-static CORE_ADDR
-s390_frame_chain (struct frame_info *thisframe)
+static int
+s390_sigtramp_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- CORE_ADDR prev_fp = 0;
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ bfd_byte sigreturn[2];
- if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe),
- get_frame_base (thisframe)))
- return deprecated_read_register_dummy (get_frame_pc (thisframe),
- get_frame_base (thisframe),
- S390_SP_REGNUM);
- else
- {
- int sigreturn = 0;
- CORE_ADDR sregs = 0;
- struct frame_extra_info prev_fextra_info;
+ if (target_read_memory (pc, sigreturn, 2))
+ return 0;
- memset (&prev_fextra_info, 0, sizeof (prev_fextra_info));
- if (get_frame_pc (thisframe))
- {
- CORE_ADDR saved_pc, sig_pc;
+ if (sigreturn[0] != 0x0a /* svc */)
+ return 0;
- saved_pc = s390_frame_saved_pc_nofix (thisframe);
- if (saved_pc)
- {
- if ((sigreturn =
- s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc)))
- saved_pc = sig_pc;
- s390_get_frame_info (s390_sniff_pc_function_start
- (saved_pc, NULL), &prev_fextra_info, NULL,
- 1);
- }
- }
- if (sigreturn)
- {
- /* read sigregs,regs.gprs[11 or 15] */
- prev_fp = read_memory_integer (sregs +
- DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM +
- (prev_fextra_info.
- frame_pointer_saved_pc
- ? 11 : 15)),
- S390_GPR_SIZE);
- get_frame_extra_info (thisframe)->sigcontext = sregs;
- }
- else
- {
- if (deprecated_get_frame_saved_regs (thisframe))
- {
- int regno;
-
- if (prev_fextra_info.frame_pointer_saved_pc
- && deprecated_get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM])
- regno = S390_FRAME_REGNUM;
- else
- regno = S390_SP_REGNUM;
-
- if (deprecated_get_frame_saved_regs (thisframe)[regno])
- {
- /* The SP's entry of `saved_regs' is special. */
- if (regno == S390_SP_REGNUM)
- prev_fp = deprecated_get_frame_saved_regs (thisframe)[regno];
- else
- prev_fp =
- read_memory_integer (deprecated_get_frame_saved_regs (thisframe)[regno],
- S390_GPR_SIZE);
- }
- }
- }
- }
- return ADDR_BITS_REMOVE (prev_fp);
+ if (sigreturn[1] != 119 /* sigreturn */
+ && sigreturn[1] != 173 /* rt_sigreturn */)
+ return 0;
+
+ return 1;
}
-/*
- Whether struct frame_extra_info is actually needed I'll have to figure
- out as our frames are similar to rs6000 there is a possibility
- i386 dosen't need it. */
+static const struct frame_unwind s390_sigtramp_frame_unwind = {
+ SIGTRAMP_FRAME,
+ s390_sigtramp_frame_this_id,
+ s390_sigtramp_frame_prev_register,
+ NULL,
+ s390_sigtramp_frame_sniffer
+};
+/* Frame base handling. */
-/* NOTE: cagney/2003-10-31: "return_value" makes
- "extract_struct_value_address", "extract_return_value", and
- "use_struct_convention" redundant. */
static CORE_ADDR
-s390_cannot_extract_struct_value_address (struct regcache *regcache)
+s390_frame_base_address (struct frame_info *this_frame, void **this_cache)
{
- return 0;
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_cache);
+ return info->frame_base;
}
-/* a given return value in `regbuf' with a type `valtype', extract and copy its
- value into `valbuf' */
-static void
-s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
+static CORE_ADDR
+s390_local_base_address (struct frame_info *this_frame, void **this_cache)
{
- /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes.
- We need to truncate the return value into float size (4 byte) if
- necessary. */
- int len = TYPE_LENGTH (valtype);
-
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- memcpy (valbuf, ®buf[DEPRECATED_REGISTER_BYTE (S390_F0_REGNUM)], len);
- else
- {
- int offset = 0;
- /* return value is copied starting from r2. */
- if (TYPE_LENGTH (valtype) < S390_GPR_SIZE)
- offset = S390_GPR_SIZE - TYPE_LENGTH (valtype);
- memcpy (valbuf,
- regbuf + DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM + 2) + offset,
- TYPE_LENGTH (valtype));
- }
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_cache);
+ return info->local_base;
}
+static const struct frame_base s390_frame_base = {
+ &s390_frame_unwind,
+ s390_frame_base_address,
+ s390_local_base_address,
+ s390_local_base_address
+};
-static char *
-s390_promote_integer_argument (struct type *valtype, char *valbuf,
- char *reg_buff, int *arglen)
+static CORE_ADDR
+s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- char *value = valbuf;
- int len = TYPE_LENGTH (valtype);
-
- if (len < S390_GPR_SIZE)
- {
- /* We need to upgrade this value to a register to pass it correctly */
- int idx, diff = S390_GPR_SIZE - len, negative =
- (!TYPE_UNSIGNED (valtype) && value[0] & 0x80);
- for (idx = 0; idx < S390_GPR_SIZE; idx++)
- {
- reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) :
- value[idx - diff]);
- }
- value = reg_buff;
- *arglen = S390_GPR_SIZE;
- }
- else
- {
- if (len & (S390_GPR_SIZE - 1))
- {
- fprintf_unfiltered (gdb_stderr,
- "s390_promote_integer_argument detected an argument not "
- "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE "
- "we might not deal with this correctly.\n");
- }
- *arglen = len;
- }
-
- return (value);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ ULONGEST pc;
+ pc = frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);
+ return gdbarch_addr_bits_remove (gdbarch, pc);
}
-static void
-s390_store_return_value (struct type *valtype, char *valbuf)
+static CORE_ADDR
+s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- int arglen;
- char *reg_buff = alloca (max (S390_FPR_SIZE, S390_GPR_SIZE)), *value;
-
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- {
- if (TYPE_LENGTH (valtype) == 4
- || TYPE_LENGTH (valtype) == 8)
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_F0_REGNUM),
- valbuf, TYPE_LENGTH (valtype));
- else
- error ("GDB is unable to return `long double' values "
- "on this architecture.");
- }
- else
- {
- value =
- s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen);
- /* Everything else is returned in GPR2 and up. */
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM + 2),
- value, arglen);
- }
+ ULONGEST sp;
+ sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+ return gdbarch_addr_bits_remove (gdbarch, sp);
}
-/* Not the most efficent code in the world */
-static int
-s390_fp_regnum (void)
-{
- int regno = S390_SP_REGNUM;
- struct frame_extra_info fextra_info;
+/* DWARF-2 frame support. */
- CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM));
+static struct value *
+s390_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
+ int regnum)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int reg = regnum - tdep->gpr_full_regnum;
+ struct value *val, *newval;
- s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info,
- NULL, 1);
- if (fextra_info.frame_pointer_saved_pc)
- regno = S390_FRAME_REGNUM;
- return regno;
-}
+ val = frame_unwind_register_value (this_frame, S390_R0_REGNUM + reg);
+ newval = value_cast (register_type (gdbarch, regnum), val);
+ if (value_optimized_out (val))
+ set_value_optimized_out (newval, 1);
-static CORE_ADDR
-s390_read_fp (void)
-{
- return read_register (s390_fp_regnum ());
+ return newval;
}
-
static void
-s390_pop_frame_regular (struct frame_info *frame)
+s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *this_frame)
{
- int regnum;
-
- write_register (S390_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Restore any saved registers. */
- if (deprecated_get_frame_saved_regs (frame))
+ /* Fixed registers are call-saved or call-clobbered
+ depending on the ABI in use. */
+ if (regnum >= 0 && regnum < S390_NUM_REGS)
{
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (deprecated_get_frame_saved_regs (frame)[regnum] != 0)
- {
- ULONGEST value;
-
- value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum],
- DEPRECATED_REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
-
- /* Actually cut back the stack. Remember that the SP's element of
- saved_regs is the old SP itself, not the address at which it is
- saved. */
- write_register (S390_SP_REGNUM, deprecated_get_frame_saved_regs (frame)[S390_SP_REGNUM]);
+ if (s390_register_call_saved (gdbarch, regnum))
+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+ else
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
}
- /* Throw away any cached frame information. */
- flush_cached_frames ();
-}
+ /* The CC pseudo register is call-clobbered. */
+ else if (regnum == tdep->cc_regnum)
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
+ /* The PC register unwinds to the return address. */
+ else if (regnum == tdep->pc_regnum)
+ reg->how = DWARF2_FRAME_REG_RA;
-/* Destroy the innermost (Top-Of-Stack) stack frame, restoring the
- machine state that was in effect before the frame was created.
- Used in the contexts of the "return" command, and of
- target function calls from the debugger. */
-static void
-s390_pop_frame (void)
-{
- /* This function checks for and handles generic dummy frames, and
- calls back to our function for ordinary frames. */
- generic_pop_current_frame (s390_pop_frame_regular);
+ /* We install a special function to unwind full GPRs to show at
+ least the lower halves (as the upper halves are undefined). */
+ else if (tdep->gpr_full_regnum != -1
+ && regnum >= tdep->gpr_full_regnum
+ && regnum < tdep->gpr_full_regnum + 16)
+ {
+ reg->how = DWARF2_FRAME_REG_FN;
+ reg->loc.fn = s390_dwarf2_prev_register;
+ }
}
+/* Dummy function calls. */
+
/* Return non-zero if TYPE is an integer-like type, zero otherwise.
"Integer-like" types are those that should be passed the way
integers are: integers, enums, ranges, characters, and booleans. */
|| code == TYPE_CODE_BOOL);
}
-
/* Return non-zero if TYPE is a pointer-like type, zero otherwise.
"Pointer-like" types are those that should be passed the way
pointers are: pointers and references. */
... and so on.
- WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC
- passes all float singletons and double singletons as if they were
- simply floats or doubles. This is *not* what the ABI says it
- should do. */
+ All such structures are passed as if they were floats or doubles,
+ as the (revised) ABI says. */
static int
is_float_singleton (struct type *type)
{
- return (TYPE_CODE (type) == TYPE_CODE_STRUCT
- && TYPE_NFIELDS (type) == 1
- && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT
- || is_float_singleton (TYPE_FIELD_TYPE (type, 0))));
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
+ {
+ struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
+ CHECK_TYPEDEF (singleton_type);
+
+ return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
+ || TYPE_CODE (singleton_type) == TYPE_CODE_DECFLOAT
+ || is_float_singleton (singleton_type));
+ }
+
+ return 0;
}
is_float_like (struct type *type)
{
return (TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT
|| is_float_singleton (type));
}
-/* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as
- defined by the parameter passing conventions described in the
- "GNU/Linux for S/390 ELF Application Binary Interface Supplement".
- Otherwise, return zero. */
static int
-is_double_or_float (struct type *type)
+is_power_of_two (unsigned int n)
{
- return (is_float_like (type)
- && (TYPE_LENGTH (type) == 4
- || TYPE_LENGTH (type) == 8));
+ return ((n & (n - 1)) == 0);
}
-
-/* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the
- parameter passing conventions described in the "GNU/Linux for S/390
- ELF Application Binary Interface Supplement". Return zero
- otherwise. */
+/* Return non-zero if TYPE should be passed as a pointer to a copy,
+ zero otherwise. */
static int
-is_double_arg (struct type *type)
+s390_function_arg_pass_by_reference (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 1;
- /* The s390x ABI doesn't handle DOUBLE_ARGS specially. */
- if (GDB_TARGET_IS_ESAME)
- return 0;
-
- return ((is_integer_like (type)
- || is_struct_like (type))
- && length == 8);
+ /* FIXME: All complex and vector types are also returned by reference. */
+ return is_struct_like (type) && !is_power_of_two (length);
}
-
-/* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by
- the parameter passing conventions described in the "GNU/Linux for
- S/390 ELF Application Binary Interface Supplement". Return zero
- otherwise. */
+/* Return non-zero if TYPE should be passed in a float register
+ if possible. */
static int
-is_simple_arg (struct type *type)
+s390_function_arg_float (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
- /* This is almost a direct translation of the ABI's language, except
- that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */
- return ((is_integer_like (type) && length <= S390_GPR_SIZE)
- || is_pointer_like (type)
- || (is_struct_like (type) && !is_double_arg (type)));
-}
-
-
-static int
-is_power_of_two (unsigned int n)
-{
- return ((n & (n - 1)) == 0);
+ return is_float_like (type);
}
-/* Return non-zero if TYPE should be passed as a pointer to a copy,
- zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by
- `is_simple_arg'. */
+/* Return non-zero if TYPE should be passed in an integer register
+ (or a pair of integer registers) if possible. */
static int
-pass_by_copy_ref (struct type *type)
+s390_function_arg_integer (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
- return (is_struct_like (type)
- && !(is_power_of_two (length) && length <= S390_GPR_SIZE));
+ return is_integer_like (type)
+ || is_pointer_like (type)
+ || (is_struct_like (type) && is_power_of_two (length));
}
-
/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
word as required for the ABI. */
static LONGEST
-extend_simple_arg (struct value *arg)
+extend_simple_arg (struct gdbarch *gdbarch, struct value *arg)
{
- struct type *type = VALUE_TYPE (arg);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct type *type = value_type (arg);
/* Even structs get passed in the least significant bits of the
register / memory word. It's not really right to extract them as
an integer, but it does take care of the extension. */
if (TYPE_UNSIGNED (type))
- return extract_unsigned_integer (VALUE_CONTENTS (arg),
- TYPE_LENGTH (type));
+ return extract_unsigned_integer (value_contents (arg),
+ TYPE_LENGTH (type), byte_order);
else
- return extract_signed_integer (VALUE_CONTENTS (arg),
- TYPE_LENGTH (type));
+ return extract_signed_integer (value_contents (arg),
+ TYPE_LENGTH (type), byte_order);
}
if (is_integer_like (type)
|| is_pointer_like (type)
- || TYPE_CODE (type) == TYPE_CODE_FLT)
+ || TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
alignment = TYPE_LENGTH (type);
else if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION)
Our caller has taken care of any type promotions needed to satisfy
prototypes or the old K&R argument-passing rules. */
static CORE_ADDR
-s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ ULONGEST orig_sp;
int i;
- int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
- /* The number of arguments passed by reference-to-copy. */
- int num_copies;
/* If the i'th argument is passed as a reference to a copy, then
copy_addr[i] is the address of the copy we made. */
CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
/* Build the reference-to-copy area. */
- num_copies = 0;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
+ struct type *type = value_type (arg);
unsigned length = TYPE_LENGTH (type);
- if (is_simple_arg (type)
- && pass_by_copy_ref (type))
+ if (s390_function_arg_pass_by_reference (type))
{
sp -= length;
sp = align_down (sp, alignment_of (type));
- write_memory (sp, VALUE_CONTENTS (arg), length);
+ write_memory (sp, value_contents (arg), length);
copy_addr[i] = sp;
- num_copies++;
}
}
/* Reserve space for the parameter area. As a conservative
simplification, we assume that everything will be passed on the
- stack. */
- {
- int i;
-
- for (i = 0; i < nargs; i++)
- {
- struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
- int length = TYPE_LENGTH (type);
-
- sp = align_down (sp, alignment_of (type));
+ stack. Since every argument larger than 8 bytes will be
+ passed by reference, we use this simple upper bound. */
+ sp -= nargs * 8;
- /* SIMPLE_ARG values get extended to S390_GPR_SIZE bytes.
- Assume every argument is. */
- if (length < S390_GPR_SIZE) length = S390_GPR_SIZE;
- sp -= length;
- }
- }
-
- /* Include space for any reference-to-copy pointers. */
- sp = align_down (sp, pointer_size);
- sp -= num_copies * pointer_size;
-
/* After all that, make sure it's still aligned on an eight-byte
boundary. */
sp = align_down (sp, 8);
int gr = 2;
CORE_ADDR starg = sp;
- /* A struct is returned using general register 2 */
+ /* A struct is returned using general register 2. */
if (struct_return)
- gr++;
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ struct_addr);
+ gr++;
+ }
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
-
- if (is_double_or_float (type)
- && fr <= S390_NUM_FP_PARAMETER_REGISTERS * 2 - 2)
- {
- /* When we store a single-precision value in an FP register,
- it occupies the leftmost bits. */
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (S390_F0_REGNUM + fr),
- VALUE_CONTENTS (arg),
- TYPE_LENGTH (type));
- fr += 2;
- }
- else if (is_simple_arg (type)
- && gr <= 6)
- {
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_register (S390_R0_REGNUM + gr, copy_addr[i]);
- else
- write_register (S390_R0_REGNUM + gr, extend_simple_arg (arg));
-
- gr++;
- }
- else if (is_double_arg (type)
- && gr <= 5)
- {
- deprecated_write_register_gen (S390_R0_REGNUM + gr,
- VALUE_CONTENTS (arg));
- deprecated_write_register_gen (S390_R0_REGNUM + gr + 1,
- VALUE_CONTENTS (arg) + S390_GPR_SIZE);
- gr += 2;
- }
- else
- {
- /* The `OTHER' case. */
- enum type_code code = TYPE_CODE (type);
- unsigned length = TYPE_LENGTH (type);
-
- /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
- in it, then don't go back and use it again later. */
- if (is_double_arg (type) && gr == 6)
- gr = 7;
-
- if (is_simple_arg (type))
- {
- /* Simple args are always extended to
- S390_GPR_SIZE bytes. */
- starg = align_up (starg, S390_GPR_SIZE);
-
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_memory_signed_integer (starg, pointer_size,
- copy_addr[i]);
- else
- /* Simple args are always extended to
- S390_GPR_SIZE bytes. */
- write_memory_signed_integer (starg, S390_GPR_SIZE,
- extend_simple_arg (arg));
- starg += S390_GPR_SIZE;
- }
- else
- {
- /* You'd think we should say:
- starg = align_up (starg, alignment_of (type));
- Unfortunately, GCC seems to simply align the stack on
- a four/eight-byte boundary, even when passing doubles. */
- starg = align_up (starg, S390_STACK_PARAMETER_ALIGNMENT);
- write_memory (starg, VALUE_CONTENTS (arg), length);
- starg += length;
- }
- }
+ struct type *type = value_type (arg);
+ unsigned length = TYPE_LENGTH (type);
+
+ if (s390_function_arg_pass_by_reference (type))
+ {
+ if (gr <= 6)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ copy_addr[i]);
+ gr++;
+ }
+ else
+ {
+ write_memory_unsigned_integer (starg, word_size, byte_order,
+ copy_addr[i]);
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_float (type))
+ {
+ /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
+ the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */
+ if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
+ 0, length, value_contents (arg));
+ fr += 2;
+ }
+ else
+ {
+ /* When we store a single-precision value in a stack slot,
+ it occupies the rightmost bits. */
+ starg = align_up (starg + length, word_size);
+ write_memory (starg - length, value_contents (arg), length);
+ }
+ }
+ else if (s390_function_arg_integer (type) && length <= word_size)
+ {
+ if (gr <= 6)
+ {
+ /* Integer arguments are always extended to word size. */
+ regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
+ extend_simple_arg (gdbarch, arg));
+ gr++;
+ }
+ else
+ {
+ /* Integer arguments are always extended to word size. */
+ write_memory_signed_integer (starg, word_size, byte_order,
+ extend_simple_arg (gdbarch, arg));
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_integer (type) && length == 2*word_size)
+ {
+ if (gr <= 5)
+ {
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
+ value_contents (arg));
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
+ value_contents (arg) + word_size);
+ gr += 2;
+ }
+ else
+ {
+ /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
+ in it, then don't go back and use it again later. */
+ gr = 7;
+
+ write_memory (starg, value_contents (arg), length);
+ starg += length;
+ }
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("unknown argument type"));
}
}
/* Allocate the standard frame areas: the register save area, the
word reserved for the compiler (which seems kind of meaningless),
and the back chain pointer. */
- sp -= S390_STACK_FRAME_OVERHEAD;
+ sp -= 16*word_size + 32;
- /* Write the back chain pointer into the first word of the stack
- frame. This will help us get backtraces from within functions
- called from GDB. */
- write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT),
- deprecated_read_fp ());
+ /* Store return address. */
+ regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
+
+ /* Store updated stack pointer. */
+ regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
- return sp;
+ /* We need to return the 'stack part' of the frame ID,
+ which is actually the top of the register save area. */
+ return sp + 16*word_size + 32;
}
+/* Assuming THIS_FRAME is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ returned by push_dummy_call, and the PC match the dummy frame's
+ breakpoint. */
+static struct frame_id
+s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ sp = gdbarch_addr_bits_remove (gdbarch, sp);
+
+ return frame_id_build (sp + 16*word_size + 32,
+ get_frame_pc (this_frame));
+}
static CORE_ADDR
s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
}
-static int
-s390_use_struct_convention (int gcc_p, struct type *value_type)
+/* Function return value access. */
+
+static enum return_value_convention
+s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
{
- enum type_code code = TYPE_CODE (value_type);
+ int length = TYPE_LENGTH (type);
+ if (length > 8)
+ return RETURN_VALUE_STRUCT_CONVENTION;
- return (code == TYPE_CODE_STRUCT
- || code == TYPE_CODE_UNION);
-}
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ case TYPE_CODE_ARRAY:
+ return RETURN_VALUE_STRUCT_CONVENTION;
-static void
-s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
-{
- write_register (S390_R0_REGNUM + 2, addr);
+ default:
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
}
+static enum return_value_convention
+s390_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *out, const gdb_byte *in)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ int length = TYPE_LENGTH (type);
+ enum return_value_convention rvc =
+ s390_return_value_convention (gdbarch, type);
+ if (in)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM,
+ 0, length, in);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments are always extended to word size. */
+ if (TYPE_UNSIGNED (type))
+ regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
+ extract_unsigned_integer (in, length, byte_order));
+ else
+ regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
+ extract_signed_integer (in, length, byte_order));
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_write (regcache, S390_R2_REGNUM, in);
+ regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("invalid return type"));
+ break;
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error (_("Cannot set function return value."));
+ break;
+ }
+ }
+ else if (out)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_read_part (regcache, S390_F0_REGNUM,
+ 0, length, out);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments occupy the rightmost bits. */
+ regcache_cooked_read_part (regcache, S390_R2_REGNUM,
+ word_size - length, length, out);
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_read (regcache, S390_R2_REGNUM, out);
+ regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("invalid return type"));
+ break;
-static const unsigned char *
-s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
-{
- static unsigned char breakpoint[] = { 0x0, 0x1 };
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error (_("Function return value unknown."));
+ break;
+ }
+ }
- *lenptr = sizeof (breakpoint);
- return breakpoint;
+ return rvc;
}
-/* Advance PC across any function entry prologue instructions to reach some
- "real" code. */
-static CORE_ADDR
-s390_skip_prologue (CORE_ADDR pc)
-{
- struct frame_extra_info fextra_info;
- s390_get_frame_info (pc, &fextra_info, NULL, 1);
- return fextra_info.skip_prologue_function_start;
-}
+/* Breakpoints. */
-/* Immediately after a function call, return the saved pc.
- Can't go through the frames for this because on some machines
- the new frame is not set up until the new function executes
- some instructions. */
-static CORE_ADDR
-s390_saved_pc_after_call (struct frame_info *frame)
+static const gdb_byte *
+s390_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr)
{
- return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
-}
+ static const gdb_byte breakpoint[] = { 0x0, 0x1 };
-static CORE_ADDR
-s390_addr_bits_remove (CORE_ADDR addr)
-{
- return (addr) & 0x7fffffff;
+ *lenptr = sizeof (breakpoint);
+ return breakpoint;
}
+/* Address handling. */
+
static CORE_ADDR
-s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
{
- write_register (S390_RETADDR_REGNUM, entry_point_address ());
- return sp;
+ return addr & 0x7fffffff;
}
static int
s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
{
if (byte_size == 4)
- return TYPE_FLAG_ADDRESS_CLASS_1;
+ return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
else
return 0;
}
static const char *
s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
{
- if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1)
+ if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
return "mode32";
else
return NULL;
{
if (strcmp (name, "mode32") == 0)
{
- *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1;
+ *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
return 1;
}
else
return 0;
}
+/* Set up gdbarch struct. */
+
static struct gdbarch *
s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- static LONGEST s390_call_dummy_words[] = { 0 };
+ const struct target_desc *tdesc = info.target_desc;
+ struct tdesc_arch_data *tdesc_data = NULL;
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
- int elf_flags;
+ int tdep_abi;
+ int have_upper = 0;
+ int first_pseudo_reg, last_pseudo_reg;
+
+ /* Default ABI and register size. */
+ switch (info.bfd_arch_info->mach)
+ {
+ case bfd_mach_s390_31:
+ tdep_abi = ABI_LINUX_S390;
+ break;
+
+ case bfd_mach_s390_64:
+ tdep_abi = ABI_LINUX_ZSERIES;
+ break;
+
+ default:
+ return NULL;
+ }
+
+ /* Use default target description if none provided by the target. */
+ if (!tdesc_has_registers (tdesc))
+ {
+ if (tdep_abi == ABI_LINUX_S390)
+ tdesc = tdesc_s390_linux32;
+ else
+ tdesc = tdesc_s390x_linux64;
+ }
+
+ /* Check any target description for validity. */
+ if (tdesc_has_registers (tdesc))
+ {
+ static const char *const gprs[] = {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
+ };
+ static const char *const fprs[] = {
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
+ };
+ static const char *const acrs[] = {
+ "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
+ "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15"
+ };
+ static const char *const gprs_lower[] = {
+ "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l",
+ "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
+ };
+ static const char *const gprs_upper[] = {
+ "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
+ "r8h", "r9h", "r10h", "r11h", "r12h", "r13h", "r14h", "r15h"
+ };
+ const struct tdesc_feature *feature;
+ int i, valid_p = 1;
+
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.core");
+ if (feature == NULL)
+ return NULL;
+
+ tdesc_data = tdesc_data_alloc ();
+
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_PSWM_REGNUM, "pswm");
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_PSWA_REGNUM, "pswa");
+
+ if (tdesc_unnumbered_register (feature, "r0"))
+ {
+ for (i = 0; i < 16; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_R0_REGNUM + i, gprs[i]);
+ }
+ else
+ {
+ have_upper = 1;
+
+ for (i = 0; i < 16; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_R0_REGNUM + i,
+ gprs_lower[i]);
+ for (i = 0; i < 16; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_R0_UPPER_REGNUM + i,
+ gprs_upper[i]);
+ }
- /* First see if there is already a gdbarch that can satisfy the request. */
- arches = gdbarch_list_lookup_by_info (arches, &info);
- if (arches != NULL)
- return arches->gdbarch;
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.fpr");
+ if (feature == NULL)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_FPC_REGNUM, "fpc");
+ for (i = 0; i < 16; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_F0_REGNUM + i, fprs[i]);
+
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.acr");
+ if (feature == NULL)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+
+ for (i = 0; i < 16; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data,
+ S390_A0_REGNUM + i, acrs[i]);
+
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+ }
- /* None found: is the request for a s390 architecture? */
- if (info.bfd_arch_info->arch != bfd_arch_s390)
- return NULL; /* No; then it's not for us. */
+ /* Find a candidate among extant architectures. */
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ tdep = gdbarch_tdep (arches->gdbarch);
+ if (!tdep)
+ continue;
+ if (tdep->abi != tdep_abi)
+ continue;
+ if ((tdep->gpr_full_regnum != -1) != have_upper)
+ continue;
+ if (tdesc_data != NULL)
+ tdesc_data_cleanup (tdesc_data);
+ return arches->gdbarch;
+ }
- /* Yes: create a new gdbarch for the specified machine type. */
+ /* Otherwise create a new gdbarch for the specified machine type. */
tdep = XCALLOC (1, struct gdbarch_tdep);
+ tdep->abi = tdep_abi;
gdbarch = gdbarch_alloc (&info, tdep);
- /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
- ready to unwind the PC first (see frame.c:get_prev_frame()). */
- set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default);
-
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
set_gdbarch_char_signed (gdbarch, 0);
- set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs);
- set_gdbarch_deprecated_store_struct_return (gdbarch, s390_store_struct_return);
- set_gdbarch_deprecated_extract_return_value (gdbarch, s390_extract_return_value);
- set_gdbarch_deprecated_store_return_value (gdbarch, s390_store_return_value);
+ /* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
+ We can safely let them default to 128-bit, since the debug info
+ will give the size of type actually used in each case. */
+ set_gdbarch_long_double_bit (gdbarch, 128);
+ set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
+
/* Amount PC must be decremented by after a breakpoint. This is
- often the number of bytes returned by BREAKPOINT_FROM_PC but not
+ often the number of bytes returned by gdbarch_breakpoint_from_pc but not
always. */
set_gdbarch_decr_pc_after_break (gdbarch, 2);
- set_gdbarch_deprecated_pop_frame (gdbarch, s390_pop_frame);
/* Stack grows downward. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
- set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
- set_gdbarch_deprecated_target_read_fp (gdbarch, s390_read_fp);
set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
- /* This function that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
- set_gdbarch_deprecated_frameless_function_invocation (gdbarch, s390_frameless_function_invocation);
- /* Return saved PC from a frame */
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, s390_frame_saved_pc);
- /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and
- produces the frame's chain-pointer. */
- set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_deprecated_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
- set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM);
+
+ set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
- set_gdbarch_deprecated_fp_regnum (gdbarch, S390_SP_REGNUM);
set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
- set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
- set_gdbarch_num_pseudo_regs (gdbarch, S390_NUM_PSEUDO_REGS);
- set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention);
- set_gdbarch_register_name (gdbarch, s390_register_name);
- set_gdbarch_register_type (gdbarch, s390_register_type);
set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
- set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
- set_gdbarch_convert_register_p (gdbarch, s390_convert_register_p);
- set_gdbarch_register_to_value (gdbarch, s390_register_to_value);
- set_gdbarch_value_to_register (gdbarch, s390_value_to_register);
- set_gdbarch_register_reggroup_p (gdbarch, s390_register_reggroup_p);
+ set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
set_gdbarch_regset_from_core_section (gdbarch,
s390_regset_from_core_section);
- set_gdbarch_deprecated_extract_struct_value_address (gdbarch, s390_cannot_extract_struct_value_address);
-
- /* Parameters for inferior function calls. */
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
+ set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
+ if (have_upper)
+ set_gdbarch_core_regset_sections (gdbarch, s390_upper_regset_sections);
+ set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
+ set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
+ set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
+ set_tdesc_pseudo_register_reggroup_p (gdbarch,
+ s390_pseudo_register_reggroup_p);
+ tdesc_use_registers (gdbarch, tdesc, tdesc_data);
+
+ /* Assign pseudo register numbers. */
+ first_pseudo_reg = gdbarch_num_regs (gdbarch);
+ last_pseudo_reg = first_pseudo_reg;
+ tdep->gpr_full_regnum = -1;
+ if (have_upper)
+ {
+ tdep->gpr_full_regnum = last_pseudo_reg;
+ last_pseudo_reg += 16;
+ }
+ tdep->pc_regnum = last_pseudo_reg++;
+ tdep->cc_regnum = last_pseudo_reg++;
+ set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);
+ set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);
+
+ /* Inferior function calls. */
+ set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
+ set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
set_gdbarch_frame_align (gdbarch, s390_frame_align);
- set_gdbarch_deprecated_push_arguments (gdbarch, s390_push_arguments);
- set_gdbarch_deprecated_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
- set_gdbarch_deprecated_push_return_address (gdbarch,
- s390_push_return_address);
- set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (s390_call_dummy_words));
- set_gdbarch_deprecated_call_dummy_words (gdbarch, s390_call_dummy_words);
-
- switch (info.bfd_arch_info->mach)
+ set_gdbarch_return_value (gdbarch, s390_return_value);
+
+ /* Frame handling. */
+ dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
+ dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
+ dwarf2_append_unwinders (gdbarch);
+ frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
+ frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
+ frame_base_set_default (gdbarch, &s390_frame_base);
+ set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
+
+ /* Displaced stepping. */
+ set_gdbarch_displaced_step_copy_insn (gdbarch,
+ simple_displaced_step_copy_insn);
+ set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
+ set_gdbarch_displaced_step_free_closure (gdbarch,
+ simple_displaced_step_free_closure);
+ set_gdbarch_displaced_step_location (gdbarch,
+ displaced_step_at_entry_point);
+ set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
+
+ switch (tdep->abi)
{
- case bfd_mach_s390_31:
+ case ABI_LINUX_S390:
tdep->gregset = &s390_gregset;
tdep->sizeof_gregset = s390_sizeof_gregset;
tdep->fpregset = &s390_fpregset;
tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
- set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
- set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
break;
- case bfd_mach_s390_64:
+
+ case ABI_LINUX_ZSERIES:
tdep->gregset = &s390x_gregset;
tdep->sizeof_gregset = s390x_sizeof_gregset;
tdep->fpregset = &s390_fpregset;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
- set_gdbarch_pseudo_register_read (gdbarch, s390x_pseudo_register_read);
- set_gdbarch_pseudo_register_write (gdbarch, s390x_pseudo_register_write);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
set_gdbarch_address_class_type_flags (gdbarch,
s390_address_class_type_flags);
set_gdbarch_address_class_type_flags_to_name (gdbarch,
break;
}
- /* Should be using push_dummy_call. */
- set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
-
set_gdbarch_print_insn (gdbarch, print_insn_s390);
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+
return gdbarch;
}
-
extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
void
_initialize_s390_tdep (void)
{
-
/* Hook us into the gdbarch mechanism. */
register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
+
+ /* Initialize the Linux target descriptions. */
+ initialize_tdesc_s390_linux32 ();
+ initialize_tdesc_s390_linux64 ();
+ initialize_tdesc_s390x_linux64 ();
}
projects / external / binutils.git / blobdiff