-/* Target-dependent code for NetBSD/i386, for GDB.
- Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002
- Free Software Foundation, Inc.
+/* Target-dependent code for NetBSD/i386.
+
+ Copyright (C) 1988-2014 Free Software Foundation, Inc.
This file is part of GDB.
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 "gdbtypes.h"
+#include "arch-utils.h"
+#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
-#include "arch-utils.h"
+#include "regset.h"
+#include "osabi.h"
+#include "symtab.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "nbsd-tdep.h"
-
#include "solib-svr4.h"
-/* Map a GDB register number to an offset in the reg structure. */
-static int regmap[] =
+/* From <machine/reg.h>. */
+static int i386nbsd_r_reg_offset[] =
{
- ( 0 * 4), /* %eax */
- ( 1 * 4), /* %ecx */
- ( 2 * 4), /* %edx */
- ( 3 * 4), /* %ebx */
- ( 4 * 4), /* %esp */
- ( 5 * 4), /* %epb */
- ( 6 * 4), /* %esi */
- ( 7 * 4), /* %edi */
- ( 8 * 4), /* %eip */
- ( 9 * 4), /* %eflags */
- (10 * 4), /* %cs */
- (11 * 4), /* %ss */
- (12 * 4), /* %ds */
- (13 * 4), /* %es */
- (14 * 4), /* %fs */
- (15 * 4), /* %gs */
+ 0 * 4, /* %eax */
+ 1 * 4, /* %ecx */
+ 2 * 4, /* %edx */
+ 3 * 4, /* %ebx */
+ 4 * 4, /* %esp */
+ 5 * 4, /* %ebp */
+ 6 * 4, /* %esi */
+ 7 * 4, /* %edi */
+ 8 * 4, /* %eip */
+ 9 * 4, /* %eflags */
+ 10 * 4, /* %cs */
+ 11 * 4, /* %ss */
+ 12 * 4, /* %ds */
+ 13 * 4, /* %es */
+ 14 * 4, /* %fs */
+ 15 * 4 /* %gs */
};
-#define SIZEOF_STRUCT_REG (16 * 4)
-
-static void
-i386nbsd_supply_reg (char *regs, int regno)
+/* From <machine/signal.h>. */
+int i386nbsd_sc_reg_offset[] =
{
- int i;
-
- for (i = 0; i <= 15; i++)
- if (regno == i || regno == -1)
- supply_register (i, regs + regmap[i]);
-}
+ 10 * 4, /* %eax */
+ 9 * 4, /* %ecx */
+ 8 * 4, /* %edx */
+ 7 * 4, /* %ebx */
+ 14 * 4, /* %esp */
+ 6 * 4, /* %ebp */
+ 5 * 4, /* %esi */
+ 4 * 4, /* %edi */
+ 11 * 4, /* %eip */
+ 13 * 4, /* %eflags */
+ 12 * 4, /* %cs */
+ 15 * 4, /* %ss */
+ 3 * 4, /* %ds */
+ 2 * 4, /* %es */
+ 1 * 4, /* %fs */
+ 0 * 4 /* %gs */
+};
-static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
- CORE_ADDR ignore)
+/* From <machine/mcontext.h>. */
+int i386nbsd_mc_reg_offset[] =
{
- char *regs, *fsave;
-
- /* We get everything from one section. */
- if (which != 0)
- return;
-
- if (core_reg_size < (SIZEOF_STRUCT_REG + 108))
- {
- warning ("Wrong size register set in core file.");
- return;
- }
-
- regs = core_reg_sect;
- fsave = core_reg_sect + SIZEOF_STRUCT_REG;
+ 11 * 4, /* %eax */
+ 10 * 4, /* %ecx */
+ 9 * 4, /* %edx */
+ 8 * 4, /* %ebx */
+ 7 * 4, /* %esp */
+ 6 * 4, /* %ebp */
+ 5 * 4, /* %esi */
+ 4 * 4, /* %edi */
+ 14 * 4, /* %eip */
+ 16 * 4, /* %eflags */
+ 15 * 4, /* %cs */
+ 18 * 4, /* %ss */
+ 3 * 4, /* %ds */
+ 2 * 4, /* %es */
+ 1 * 4, /* %fs */
+ 0 * 4 /* %gs */
+};
- /* Integer registers. */
- i386nbsd_supply_reg (regs, -1);
+static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
+ struct frame_info *,
+ struct trad_frame_cache *,
+ CORE_ADDR);
- /* Floating point registers. */
- i387_supply_fsave (fsave);
-}
+static const struct tramp_frame i386nbsd_sigtramp_sc16 =
+{
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
+ /* leal 0x10(%esp), %eax */
+ { 0x50, -1 }, /* pushl %eax */
+ { 0x50, -1 }, /* pushl %eax */
+ { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x127, %eax # __sigreturn14 */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax # exit */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
+};
-static void
-fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size,
- int which, CORE_ADDR ignore)
+static const struct tramp_frame i386nbsd_sigtramp_sc2 =
{
- switch (which)
- {
- case 0: /* Integer registers. */
- if (core_reg_size != SIZEOF_STRUCT_REG)
- warning ("Wrong size register set in core file.");
- else
- i386nbsd_supply_reg (core_reg_sect, -1);
- break;
-
- case 2: /* Floating point registers. */
- if (core_reg_size != 108)
- warning ("Wrong size FP register set in core file.");
- else
- i387_supply_fsave (core_reg_sect);
- break;
-
- case 3: /* "Extended" floating point registers. This is gdb-speak
- for SSE/SSE2. */
- if (core_reg_size != 512)
- warning ("Wrong size XMM register set in core file.");
- else
- i387_supply_fxsave (core_reg_sect);
- break;
-
- default:
- /* Don't know what kind of register request this is; just ignore it. */
- break;
- }
-}
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
+ /* leal 0x0c(%esp), %eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x127, %eax # __sigreturn14 */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
+};
-static struct core_fns i386nbsd_core_fns =
+static const struct tramp_frame i386nbsd_sigtramp_si2 =
{
- bfd_target_unknown_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL /* next */
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
+ /* movl 8(%esp),%eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x134, %eax # setcontext */
+ { 0xcd, -1 }, { 0x80, -1 },
+ /* int $0x80 */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1 },
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
};
-static struct core_fns i386nbsd_elfcore_fns =
+static const struct tramp_frame i386nbsd_sigtramp_si31 =
{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_elfcore_registers, /* core_read_registers */
- NULL /* next */
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
+ { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* leal 0x8c(%esp), %eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x134, %eax # setcontext */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
};
-/* Under NetBSD/i386, signal handler invocations can be identified by the
- designated code sequence that is used to return from a signal handler.
- In particular, the return address of a signal handler points to the
- following code sequence:
-
- leal 0x10(%esp), %eax
- pushl %eax
- pushl %eax
- movl $0x127, %eax # __sigreturn14
- int $0x80
-
- Each instruction has a unique encoding, so we simply attempt to match
- the instruction the PC is pointing to with any of the above instructions.
- If there is a hit, we know the offset to the start of the designated
- sequence and can then check whether we really are executing in the
- signal trampoline. If not, -1 is returned, otherwise the offset from the
- start of the return sequence is returned. */
-#define RETCODE_INSN1 0x8d
-#define RETCODE_INSN2 0x50
-#define RETCODE_INSN3 0x50
-#define RETCODE_INSN4 0xb8
-#define RETCODE_INSN5 0xcd
-
-#define RETCODE_INSN2_OFF 4
-#define RETCODE_INSN3_OFF 5
-#define RETCODE_INSN4_OFF 6
-#define RETCODE_INSN5_OFF 11
-
-static const unsigned char sigtramp_retcode[] =
+static const struct tramp_frame i386nbsd_sigtramp_si4 =
{
- RETCODE_INSN1, 0x44, 0x24, 0x10,
- RETCODE_INSN2,
- RETCODE_INSN3,
- RETCODE_INSN4, 0x27, 0x01, 0x00, 0x00,
- RETCODE_INSN5, 0x80,
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
+ { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* leal 0x8c(%esp), %eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x134, %eax # setcontext */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
+ /* movl $0xffffffff,0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
};
-static LONGEST
-i386nbsd_sigtramp_offset (CORE_ADDR pc)
+static void
+i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
{
- unsigned char ret[sizeof(sigtramp_retcode)], insn;
- LONGEST off;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
+ CORE_ADDR base;
+ int *reg_offset;
+ int num_regs;
int i;
- if (read_memory_nobpt (pc, &insn, 1) != 0)
- return -1;
-
- switch (insn)
+ if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
{
- case RETCODE_INSN1:
- off = 0;
- break;
-
- case RETCODE_INSN2:
- /* INSN2 and INSN3 are the same. Read at the location of PC+1
- to determine if we're actually looking at INSN2 or INSN3. */
- if (read_memory_nobpt (pc + 1, &insn, 1) != 0)
- return -1;
-
- if (insn == RETCODE_INSN3)
- off = RETCODE_INSN2_OFF;
- else
- off = RETCODE_INSN3_OFF;
- break;
-
- case RETCODE_INSN4:
- off = RETCODE_INSN4_OFF;
- break;
-
- case RETCODE_INSN5:
- off = RETCODE_INSN5_OFF;
- break;
-
- default:
- return -1;
- }
-
- pc -= off;
+ reg_offset = i386nbsd_sc_reg_offset;
+ num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
- if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
- return -1;
-
- if (memcmp (ret, sigtramp_retcode, sizeof (ret)) == 0)
- return off;
+ /* Read in the sigcontext address. */
+ base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
+ }
+ else
+ {
+ reg_offset = i386nbsd_mc_reg_offset;
+ num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
- return -1;
-}
+ /* Read in the ucontext address. */
+ base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
+ /* offsetof(ucontext_t, uc_mcontext) == 36 */
+ base += 36;
+ }
-static int
-i386nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
-{
+ for (i = 0; i < num_regs; i++)
+ if (reg_offset[i] != -1)
+ trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
- return (nbsd_pc_in_sigtramp (pc, name)
- || i386nbsd_sigtramp_offset (pc) >= 0);
+ /* Construct the frame ID using the function start. */
+ trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
-
-/* From <machine/signal.h>. */
-int i386nbsd_sc_pc_offset = 44;
-int i386nbsd_sc_sp_offset = 56;
+\f
static void
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
/* Obviously NetBSD is BSD-based. */
i386bsd_init_abi (info, gdbarch);
- /* NetBSD has different signal trampoline conventions. */
- set_gdbarch_pc_in_sigtramp (gdbarch, i386nbsd_pc_in_sigtramp);
+ /* NetBSD has a different `struct reg'. */
+ tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
+ tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
+ tdep->sizeof_gregset = 16 * 4;
/* NetBSD uses -freg-struct-return by default. */
tdep->struct_return = reg_struct_return;
- /* NetBSD has a `struct sigcontext' that's different from the
- origional 4.3 BSD. */
- tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
- tdep->sc_sp_offset = i386nbsd_sc_sp_offset;
+ /* NetBSD uses tramp_frame sniffers for signal trampolines. */
+ tdep->sigcontext_addr= 0;
+ tdep->sigtramp_start = 0;
+ tdep->sigtramp_end = 0;
+ tdep->sigtramp_p = 0;
+ tdep->sc_reg_offset = 0;
+ tdep->sc_num_regs = 0;
+
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
}
/* NetBSD ELF. */
+
static void
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
i386_elf_init_abi (info, gdbarch);
/* NetBSD ELF uses SVR4-style shared libraries. */
- set_gdbarch_in_solib_call_trampoline (gdbarch,
- generic_in_solib_call_trampoline);
- set_solib_svr4_fetch_link_map_offsets (gdbarch,
- nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* NetBSD ELF uses -fpcc-struct-return by default. */
tdep->struct_return = pcc_struct_return;
-
- /* We support the SSE registers on NetBSD ELF. */
- tdep->num_xmm_regs = I386_NUM_XREGS - 1;
- set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
- + I386_NUM_XREGS);
}
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_i386nbsd_tdep;
+
void
_initialize_i386nbsd_tdep (void)
{
- add_core_fns (&i386nbsd_core_fns);
- add_core_fns (&i386nbsd_elfcore_fns);
-
- gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
- i386nbsd_init_abi);
- gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
i386nbsdelf_init_abi);
}
projects / platform / upstream / binutils.git / blobdiff