/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1996-2005, 2007-2012 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 "arch-utils.h"
#include "regcache.h"
#include "gdb_string.h"
#include "gdb_assert.h"
-#include "gdbcore.h" /* for write_memory_unsigned_integer */
+#include "gdbcore.h" /* For write_memory_unsigned_integer. */
#include "value.h"
#include "gdbtypes.h"
#include "frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
-#include "trad-frame.h"
#include "symtab.h"
#include "dwarf2-frame.h"
-#include "regcache.h"
+#include "osabi.h"
+#include "infcall.h"
+#include "prologue-value.h"
+#include "target.h"
#include "mn10300-tdep.h"
-/* Forward decl. */
-extern struct trad_frame_cache *mn10300_frame_unwind_cache (struct frame_info*,
- void **);
+
+/* The am33-2 has 64 registers. */
+#define MN10300_MAX_NUM_REGS 64
+
+/* This structure holds the results of a prologue analysis. */
+struct mn10300_prologue
+{
+ /* The architecture for which we generated this prologue info. */
+ struct gdbarch *gdbarch;
+
+ /* The offset from the frame base to the stack pointer --- always
+ zero or negative.
+
+ Calling this a "size" is a bit misleading, but given that the
+ stack grows downwards, using offsets for everything keeps one
+ from going completely sign-crazy: you never change anything's
+ sign for an ADD instruction; always change the second operand's
+ sign for a SUB instruction; and everything takes care of
+ itself. */
+ int frame_size;
+
+ /* Non-zero if this function has initialized the frame pointer from
+ the stack pointer, zero otherwise. */
+ int has_frame_ptr;
+
+ /* If has_frame_ptr is non-zero, this is the offset from the frame
+ base to where the frame pointer points. This is always zero or
+ negative. */
+ int frame_ptr_offset;
+
+ /* The address of the first instruction at which the frame has been
+ set up and the arguments are where the debug info says they are
+ --- as best as we can tell. */
+ CORE_ADDR prologue_end;
+
+ /* reg_offset[R] is the offset from the CFA at which register R is
+ saved, or 1 if register R has not been saved. (Real values are
+ always zero or negative.) */
+ int reg_offset[MN10300_MAX_NUM_REGS];
+};
+
/* Compute the alignment required by a type. */
}
}
-/* MVS note this is deprecated. */
/* Should call_function allocate stack space for a struct return? */
-/* gcc_p unused */
static int
-mn10300_use_struct_convention (int gcc_p, struct type *type)
+mn10300_use_struct_convention (struct type *type)
{
/* Structures bigger than a pair of words can't be returned in
registers. */
/* Structures with a single field are handled as the field
itself. */
if (TYPE_NFIELDS (type) == 1)
- return mn10300_use_struct_convention (gcc_p,
- TYPE_FIELD_TYPE (type, 0));
+ return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0));
/* Structures with word or double-word size are passed in memory, as
long as they require at least word alignment. */
return 1;
case TYPE_CODE_TYPEDEF:
- return mn10300_use_struct_convention (gcc_p, check_typedef (type));
+ return mn10300_use_struct_convention (check_typedef (type));
default:
return 0;
}
}
-/* MVS note this is deprecated. */
static void
-mn10300_store_return_value (struct type *type,
+mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
struct regcache *regcache, const void *valbuf)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
int len = TYPE_LENGTH (type);
int reg, regsz;
_("Cannot store return value %d bytes long."), len);
}
-/* MVS note deprecated. */
static void
-mn10300_extract_return_value (struct type *type,
+mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
struct regcache *regcache, void *valbuf)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
char buf[MAX_REGISTER_SIZE];
int len = TYPE_LENGTH (type);
int reg, regsz;
_("Cannot extract return value %d bytes long."), len);
}
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+mn10300_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ if (mn10300_use_struct_convention (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (readbuf)
+ mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
+ if (writebuf)
+ mn10300_store_return_value (gdbarch, type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
static char *
register_name (int reg, char **regs, long sizeof_regs)
{
}
static const char *
-mn10300_generic_register_name (int reg)
+mn10300_generic_register_name (struct gdbarch *gdbarch, int reg)
{
static char *regs[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
static const char *
-am33_register_name (int reg)
+am33_register_name (struct gdbarch *gdbarch, int reg)
{
static char *regs[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
return register_name (reg, regs, sizeof regs);
}
+static const char *
+am33_2_register_name (struct gdbarch *gdbarch, int reg)
+{
+ static char *regs[] =
+ {
+ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "mdrq", "r0",
+ "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ssp",
+ "msp", "usp", "mcrh", "mcrl", "mcvf", "fpcr", "", "",
+ "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
+ "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
+ "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
+ "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
+ };
+ return register_name (reg, regs, sizeof regs);
+}
static struct type *
mn10300_register_type (struct gdbarch *gdbarch, int reg)
{
- return builtin_type_int;
+ return builtin_type (gdbarch)->builtin_int;
}
static CORE_ADDR
-mn10300_read_pc (ptid_t ptid)
+mn10300_read_pc (struct regcache *regcache)
{
- return read_register_pid (E_PC_REGNUM, ptid);
+ ULONGEST val;
+ regcache_cooked_read_unsigned (regcache, E_PC_REGNUM, &val);
+ return val;
}
static void
-mn10300_write_pc (CORE_ADDR val, ptid_t ptid)
+mn10300_write_pc (struct regcache *regcache, CORE_ADDR val)
{
- return write_register_pid (E_PC_REGNUM, val, ptid);
+ regcache_cooked_write_unsigned (regcache, E_PC_REGNUM, val);
}
/* The breakpoint instruction must be the same size as the smallest
one, so we defined it ourselves. */
const static unsigned char *
-mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
+mn10300_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr,
+ int *bp_size)
{
static char breakpoint[] = {0xff};
*bp_size = 1;
return breakpoint;
}
-/*
- * Frame Extra Info:
- *
- * status -- actually frame type (SP, FP, or last frame)
- * stack size -- offset to the next frame
- *
- * The former might ultimately be stored in the frame_base.
- * Seems like there'd be a way to store the later too.
- *
- * Temporarily supply empty stub functions as place holders.
- */
-
+/* Model the semantics of pushing a register onto the stack. This
+ is a helper function for mn10300_analyze_prologue, below. */
static void
-my_frame_is_in_sp (struct frame_info *fi, void **this_cache)
+push_reg (pv_t *regs, struct pv_area *stack, int regnum)
{
- struct trad_frame_cache *cache = mn10300_frame_unwind_cache (fi, this_cache);
- trad_frame_set_this_base (cache,
- frame_unwind_register_unsigned (fi,
- E_SP_REGNUM));
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ pv_area_store (stack, regs[E_SP_REGNUM], 4, regs[regnum]);
}
-static void
-my_frame_is_in_fp (struct frame_info *fi, void **this_cache)
+/* Translate an "r" register number extracted from an instruction encoding
+ into a GDB register number. Adapted from a simulator function
+ of the same name; see am33.igen. */
+static int
+translate_rreg (int rreg)
{
- struct trad_frame_cache *cache = mn10300_frame_unwind_cache (fi, this_cache);
- trad_frame_set_this_base (cache,
- frame_unwind_register_unsigned (fi,
- E_A3_REGNUM));
+ /* The higher register numbers actually correspond to the
+ basic machine's address and data registers. */
+ if (rreg > 7 && rreg < 12)
+ return E_A0_REGNUM + rreg - 8;
+ else if (rreg > 11 && rreg < 16)
+ return E_D0_REGNUM + rreg - 12;
+ else
+ return E_E0_REGNUM + rreg;
}
+/* Find 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 RESULT_UNTYPED. */
static void
-my_frame_is_last (struct frame_info *fi)
+check_for_saved (void *result_untyped, pv_t addr, CORE_ADDR size, pv_t value)
{
-}
+ struct mn10300_prologue *result = (struct mn10300_prologue *) result_untyped;
-static int
-is_my_frame_in_sp (struct frame_info *fi)
-{
- return 0;
+ if (value.kind == pvk_register
+ && value.k == 0
+ && pv_is_register (addr, E_SP_REGNUM)
+ && size == register_size (result->gdbarch, value.reg))
+ result->reg_offset[value.reg] = addr.k;
}
-static int
-is_my_frame_in_fp (struct frame_info *fi)
+/* Analyze the prologue to determine where registers are saved,
+ the end of the prologue, etc. The result of this analysis is
+ returned in RESULT. See struct mn10300_prologue above for more
+ information. */
+static void
+mn10300_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct mn10300_prologue *result)
{
- return 0;
-}
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR pc;
+ int rn;
+ pv_t regs[MN10300_MAX_NUM_REGS];
+ struct pv_area *stack;
+ struct cleanup *back_to;
+ CORE_ADDR after_last_frame_setup_insn = start_pc;
+ int am33_mode = AM33_MODE (gdbarch);
+
+ memset (result, 0, sizeof (*result));
+ result->gdbarch = gdbarch;
+
+ for (rn = 0; rn < MN10300_MAX_NUM_REGS; rn++)
+ {
+ regs[rn] = pv_register (rn, 0);
+ result->reg_offset[rn] = 1;
+ }
+ stack = make_pv_area (E_SP_REGNUM, gdbarch_addr_bit (gdbarch));
+ back_to = make_cleanup_free_pv_area (stack);
+
+ /* The typical call instruction will have saved the return address on the
+ stack. Space for the return address has already been preallocated in
+ the caller's frame. It's possible, such as when using -mrelax with gcc
+ that other registers were saved as well. If this happens, we really
+ have no chance of deciphering the frame. DWARF info can save the day
+ when this happens. */
+ pv_area_store (stack, regs[E_SP_REGNUM], 4, regs[E_PC_REGNUM]);
+
+ pc = start_pc;
+ while (pc < limit_pc)
+ {
+ int status;
+ gdb_byte instr[2];
-static int
-is_my_frame_last (struct frame_info *fi)
-{
- return 0;
-}
+ /* Instructions can be as small as one byte; however, we usually
+ need at least two bytes to do the decoding, so fetch that many
+ to begin with. */
+ status = target_read_memory (pc, instr, 2);
+ if (status != 0)
+ break;
-static void
-set_my_stack_size (struct frame_info *fi, CORE_ADDR size)
-{
-}
+ /* movm [regs], sp */
+ if (instr[0] == 0xcf)
+ {
+ gdb_byte save_mask;
+
+ save_mask = instr[1];
+
+ if ((save_mask & movm_exreg0_bit) && am33_mode)
+ {
+ push_reg (regs, stack, E_E2_REGNUM);
+ push_reg (regs, stack, E_E3_REGNUM);
+ }
+ if ((save_mask & movm_exreg1_bit) && am33_mode)
+ {
+ push_reg (regs, stack, E_E4_REGNUM);
+ push_reg (regs, stack, E_E5_REGNUM);
+ push_reg (regs, stack, E_E6_REGNUM);
+ push_reg (regs, stack, E_E7_REGNUM);
+ }
+ if ((save_mask & movm_exother_bit) && am33_mode)
+ {
+ push_reg (regs, stack, E_E0_REGNUM);
+ push_reg (regs, stack, E_E1_REGNUM);
+ push_reg (regs, stack, E_MDRQ_REGNUM);
+ push_reg (regs, stack, E_MCRH_REGNUM);
+ push_reg (regs, stack, E_MCRL_REGNUM);
+ push_reg (regs, stack, E_MCVF_REGNUM);
+ }
+ if (save_mask & movm_d2_bit)
+ push_reg (regs, stack, E_D2_REGNUM);
+ if (save_mask & movm_d3_bit)
+ push_reg (regs, stack, E_D3_REGNUM);
+ if (save_mask & movm_a2_bit)
+ push_reg (regs, stack, E_A2_REGNUM);
+ if (save_mask & movm_a3_bit)
+ push_reg (regs, stack, E_A3_REGNUM);
+ if (save_mask & movm_other_bit)
+ {
+ push_reg (regs, stack, E_D0_REGNUM);
+ push_reg (regs, stack, E_D1_REGNUM);
+ push_reg (regs, stack, E_A0_REGNUM);
+ push_reg (regs, stack, E_A1_REGNUM);
+ push_reg (regs, stack, E_MDR_REGNUM);
+ push_reg (regs, stack, E_LIR_REGNUM);
+ push_reg (regs, stack, E_LAR_REGNUM);
+ /* The `other' bit leaves a blank area of four bytes at
+ the beginning of its block of saved registers, making
+ it 32 bytes long in total. */
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ }
+
+ pc += 2;
+ after_last_frame_setup_insn = pc;
+ }
+ /* mov sp, aN */
+ else if ((instr[0] & 0xfc) == 0x3c)
+ {
+ int aN = instr[0] & 0x03;
+ regs[E_A0_REGNUM + aN] = regs[E_SP_REGNUM];
-/* Set offsets of registers saved by movm instruction.
- This is a helper function for mn10300_analyze_prologue. */
+ pc += 1;
+ if (aN == 3)
+ after_last_frame_setup_insn = pc;
+ }
+ /* mov aM, aN */
+ else if ((instr[0] & 0xf0) == 0x90
+ && (instr[0] & 0x03) != ((instr[0] & 0x0c) >> 2))
+ {
+ int aN = instr[0] & 0x03;
+ int aM = (instr[0] & 0x0c) >> 2;
-static void
-set_movm_offsets (struct frame_info *fi,
- void **this_cache,
- int movm_args)
-{
- struct trad_frame_cache *cache;
- int offset = 0;
- CORE_ADDR base;
+ regs[E_A0_REGNUM + aN] = regs[E_A0_REGNUM + aM];
- if (fi == NULL || this_cache == NULL)
- return;
+ pc += 1;
+ }
+ /* mov dM, dN */
+ else if ((instr[0] & 0xf0) == 0x80
+ && (instr[0] & 0x03) != ((instr[0] & 0x0c) >> 2))
+ {
+ int dN = instr[0] & 0x03;
+ int dM = (instr[0] & 0x0c) >> 2;
- cache = mn10300_frame_unwind_cache (fi, this_cache);
- if (cache == NULL)
- return;
+ regs[E_D0_REGNUM + dN] = regs[E_D0_REGNUM + dM];
- base = trad_frame_get_this_base (cache);
- if (movm_args & movm_other_bit)
- {
- /* The `other' bit leaves a blank area of four bytes at the
- beginning of its block of saved registers, making it 32 bytes
- long in total. */
- trad_frame_set_reg_addr (cache, E_LAR_REGNUM, base + offset + 4);
- trad_frame_set_reg_addr (cache, E_LIR_REGNUM, base + offset + 8);
- trad_frame_set_reg_addr (cache, E_MDR_REGNUM, base + offset + 12);
- trad_frame_set_reg_addr (cache, E_A0_REGNUM + 1, base + offset + 16);
- trad_frame_set_reg_addr (cache, E_A0_REGNUM, base + offset + 20);
- trad_frame_set_reg_addr (cache, E_D0_REGNUM + 1, base + offset + 24);
- trad_frame_set_reg_addr (cache, E_D0_REGNUM, base + offset + 28);
- offset += 32;
- }
+ pc += 1;
+ }
+ /* mov aM, dN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xd0)
+ {
+ int dN = instr[1] & 0x03;
+ int aM = (instr[1] & 0x0c) >> 2;
- if (movm_args & movm_a3_bit)
- {
- trad_frame_set_reg_addr (cache, E_A3_REGNUM, base + offset);
- offset += 4;
- }
- if (movm_args & movm_a2_bit)
- {
- trad_frame_set_reg_addr (cache, E_A2_REGNUM, base + offset);
- offset += 4;
- }
- if (movm_args & movm_d3_bit)
- {
- trad_frame_set_reg_addr (cache, E_D3_REGNUM, base + offset);
- offset += 4;
- }
- if (movm_args & movm_d2_bit)
- {
- trad_frame_set_reg_addr (cache, E_D2_REGNUM, base + offset);
- offset += 4;
- }
- if (AM33_MODE)
- {
- if (movm_args & movm_exother_bit)
- {
- trad_frame_set_reg_addr (cache, E_MCVF_REGNUM, base + offset);
- trad_frame_set_reg_addr (cache, E_MCRL_REGNUM, base + offset + 4);
- trad_frame_set_reg_addr (cache, E_MCRH_REGNUM, base + offset + 8);
- trad_frame_set_reg_addr (cache, E_MDRQ_REGNUM, base + offset + 12);
- trad_frame_set_reg_addr (cache, E_E1_REGNUM, base + offset + 16);
- trad_frame_set_reg_addr (cache, E_E0_REGNUM, base + offset + 20);
- offset += 24;
- }
- if (movm_args & movm_exreg1_bit)
- {
- trad_frame_set_reg_addr (cache, E_E7_REGNUM, base + offset);
- trad_frame_set_reg_addr (cache, E_E6_REGNUM, base + offset + 4);
- trad_frame_set_reg_addr (cache, E_E5_REGNUM, base + offset + 8);
- trad_frame_set_reg_addr (cache, E_E4_REGNUM, base + offset + 12);
- offset += 16;
- }
- if (movm_args & movm_exreg0_bit)
- {
- trad_frame_set_reg_addr (cache, E_E3_REGNUM, base + offset);
- trad_frame_set_reg_addr (cache, E_E2_REGNUM, base + offset + 4);
- offset += 8;
- }
- }
- /* The last (or first) thing on the stack will be the PC. */
- trad_frame_set_reg_addr (cache, E_PC_REGNUM, base + offset);
- /* Save the SP in the 'traditional' way.
- This will be the same location where the PC is saved. */
- trad_frame_set_reg_value (cache, E_SP_REGNUM, base + offset);
-}
+ regs[E_D0_REGNUM + dN] = regs[E_A0_REGNUM + aM];
-/* The main purpose of this file is dealing with prologues to extract
- information about stack frames and saved registers.
+ pc += 2;
+ }
+ /* mov dM, aN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xe0)
+ {
+ int aN = instr[1] & 0x03;
+ int dM = (instr[1] & 0x0c) >> 2;
- In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
- function is pretty readable, and has a nice explanation of how the
- prologue is generated. The prologues generated by that code will
- have the following form (NOTE: the current code doesn't handle all
- this!):
+ regs[E_A0_REGNUM + aN] = regs[E_D0_REGNUM + dM];
- + If this is an old-style varargs function, then its arguments
- need to be flushed back to the stack:
-
- mov d0,(4,sp)
- mov d1,(4,sp)
+ pc += 2;
+ }
+ /* add imm8, SP */
+ else if (instr[0] == 0xf8 && instr[1] == 0xfe)
+ {
+ gdb_byte buf[1];
+ LONGEST imm8;
- + If we use any of the callee-saved registers, save them now.
-
- movm [some callee-saved registers],(sp)
- + If we have any floating-point registers to save:
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- - Decrement the stack pointer to reserve space for the registers.
- If the function doesn't need a frame pointer, we may combine
- this with the adjustment that reserves space for the frame.
+ imm8 = extract_signed_integer (buf, 1, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm8);
- add -SIZE, sp
+ pc += 3;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm16, SP */
+ else if (instr[0] == 0xfa && instr[1] == 0xfe)
+ {
+ gdb_byte buf[2];
+ LONGEST imm16;
- - Save the floating-point registers. We have two possible
- strategies:
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- . Save them at fixed offset from the SP:
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm16);
- fmov fsN,(OFFSETN,sp)
- fmov fsM,(OFFSETM,sp)
- ...
+ pc += 4;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm32, SP */
+ else if (instr[0] == 0xfc && instr[1] == 0xfe)
+ {
+ gdb_byte buf[4];
+ LONGEST imm32;
- Note that, if OFFSETN happens to be zero, you'll get the
- different opcode: fmov fsN,(sp)
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- . Or, set a0 to the start of the save area, and then use
- post-increment addressing to save the FP registers.
- mov sp, a0
- add SIZE, a0
- fmov fsN,(a0+)
- fmov fsM,(a0+)
- ...
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm32);
- + If the function needs a frame pointer, we set it here.
+ pc += 6;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm8, aN */
+ else if ((instr[0] & 0xfc) == 0x20)
+ {
+ int aN;
+ LONGEST imm8;
- mov sp, a3
+ aN = instr[0] & 0x03;
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
- + Now we reserve space for the stack frame proper. This could be
- merged into the `add -SIZE, sp' instruction for FP saves up
- above, unless we needed to set the frame pointer in the previous
- step, or the frame is so large that allocating the whole thing at
- once would put the FP register save slots out of reach of the
- addressing mode (128 bytes).
-
- add -SIZE, sp
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm8);
- One day we might keep the stack pointer constant, that won't
- change the code for prologues, but it will make the frame
- pointerless case much more common. */
+ pc += 2;
+ }
+ /* add imm16, aN */
+ else if (instr[0] == 0xfa && (instr[1] & 0xfc) == 0xd0)
+ {
+ int aN;
+ LONGEST imm16;
+ gdb_byte buf[2];
-/* Analyze the prologue to determine where registers are saved,
- the end of the prologue, etc etc. Return the end of the prologue
- scanned.
+ aN = instr[1] & 0x03;
- We store into FI (if non-null) several tidbits of information:
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- * stack_size -- size of this stack frame. Note that if we stop in
- certain parts of the prologue/epilogue we may claim the size of the
- current frame is zero. This happens when the current frame has
- not been allocated yet or has already been deallocated.
- * fsr -- Addresses of registers saved in the stack by this frame.
+ imm16 = extract_signed_integer (buf, 2, byte_order);
- * status -- A (relatively) generic status indicator. It's a bitmask
- with the following bits:
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm16);
- MY_FRAME_IN_SP: The base of the current frame is actually in
- the stack pointer. This can happen for frame pointerless
- functions, or cases where we're stopped in the prologue/epilogue
- itself. For these cases mn10300_analyze_prologue will need up
- update fi->frame before returning or analyzing the register
- save instructions.
+ pc += 4;
+ }
+ /* add imm32, aN */
+ else if (instr[0] == 0xfc && (instr[1] & 0xfc) == 0xd0)
+ {
+ int aN;
+ LONGEST imm32;
+ gdb_byte buf[4];
- MY_FRAME_IN_FP: The base of the current frame is in the
- frame pointer register ($a3).
+ aN = instr[1] & 0x03;
- NO_MORE_FRAMES: Set this if the current frame is "start" or
- if the first instruction looks like mov <imm>,sp. This tells
- frame chain to not bother trying to unwind past this frame. */
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
-static CORE_ADDR
-mn10300_analyze_prologue (struct frame_info *fi,
- void **this_cache,
- CORE_ADDR pc)
-{
- CORE_ADDR func_addr, func_end, addr, stop;
- long stack_size;
- int imm_size;
- unsigned char buf[4];
- int status, movm_args = 0;
- char *name;
-
- /* Use the PC in the frame if it's provided to look up the
- start of this function.
-
- Note: kevinb/2003-07-16: We used to do the following here:
- pc = (fi ? get_frame_pc (fi) : pc);
- But this is (now) badly broken when called from analyze_dummy_frame().
- */
- if (fi)
- {
- pc = (pc ? pc : get_frame_pc (fi));
- /* At the start of a function our frame is in the stack pointer. */
- my_frame_is_in_sp (fi, this_cache);
- }
+ imm32 = extract_signed_integer (buf, 2, byte_order);
- /* Find the start of this function. */
- status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm32);
+ pc += 6;
+ }
+ /* fmov fsM, (rN) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ gdb_byte buf[1];
- /* Do nothing if we couldn't find the start of this function
+ Y = (instr[1] & 0x02) >> 1;
- MVS: comment went on to say "or if we're stopped at the first
- instruction in the prologue" -- but code doesn't reflect that,
- and I don't want to do that anyway. */
- if (status == 0)
- {
- return pc;
- }
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- /* If we're in start, then give up. */
- if (strcmp (name, "start") == 0)
- {
- if (fi != NULL)
- my_frame_is_last (fi);
- return pc;
- }
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
-#if 0
- /* Get the next two bytes into buf, we need two because rets is a two
- byte insn and the first isn't enough to uniquely identify it. */
- status = deprecated_read_memory_nobpt (pc, buf, 2);
- if (status != 0)
- return pc;
+ pv_area_store (stack, regs[translate_rreg (rN)], 4,
+ regs[E_FS0_REGNUM + fsM]);
- /* Note: kevinb/2003-07-16: We shouldn't be making these sorts of
- changes to the frame in prologue examination code. */
- /* If we're physically on an "rets" instruction, then our frame has
- already been deallocated. Note this can also be true for retf
- and ret if they specify a size of zero.
+ pc += 3;
+ }
+ /* fmov fsM, (sp) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ gdb_byte buf[1];
- In this case fi->frame is bogus, we need to fix it. */
- if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
- {
- if (get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
- return get_frame_pc (fi);
- }
+ Y = (instr[1] & 0x02) >> 1;
- /* Similarly if we're stopped on the first insn of a prologue as our
- frame hasn't been allocated yet. */
- if (fi && get_frame_pc (fi) == func_addr)
- {
- if (get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
- return get_frame_pc (fi);
- }
-#endif
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- /* NOTE: from here on, we don't want to return without jumping to
- finish_prologue. */
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ pv_area_store (stack, regs[E_SP_REGNUM], 4,
+ regs[E_FS0_REGNUM + fsM]);
+
+ pc += 3;
+ }
+ /* fmov fsM, (rN, rI) */
+ else if (instr[0] == 0xfb && instr[1] == 0x37)
+ {
+ int fsM, sM, Z, rN, rI;
+ gdb_byte buf[2];
- /* Figure out where to stop scanning. */
- stop = fi ? pc : func_end;
- /* Don't walk off the end of the function. */
- stop = stop > func_end ? func_end : stop;
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- /* Start scanning on the first instruction of this function. */
- addr = func_addr;
+ rI = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ sM = (buf[1] & 0xf0) >> 4;
+ Z = (buf[1] & 0x02) >> 1;
+ fsM = (Z << 4) | sM;
- /* Suck in two bytes. */
- if (addr + 2 >= stop
- || (status = deprecated_read_memory_nobpt (addr, buf, 2)) != 0)
- goto finish_prologue;
+ pv_area_store (stack,
+ pv_add (regs[translate_rreg (rN)],
+ regs[translate_rreg (rI)]),
+ 4, regs[E_FS0_REGNUM + fsM]);
- /* First see if this insn sets the stack pointer from a register; if
- so, it's probably the initialization of the stack pointer in _start,
- so mark this as the bottom-most frame. */
- if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
- {
- if (fi)
- my_frame_is_last (fi);
- goto finish_prologue;
- }
+ pc += 4;
+ }
+ /* fmov fsM, (d8, rN) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d8;
+ gdb_byte buf[2];
- /* Now look for movm [regs],sp, which saves the callee saved registers.
+ Y = (instr[1] & 0x02) >> 1;
- At this time we don't know if fi->frame is valid, so we only note
- that we encountered a movm instruction. Later, we'll set the entries
- in fsr.regs as needed. */
- if (buf[0] == 0xcf)
- {
- /* Extract the register list for the movm instruction. */
- movm_args = buf[1];
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- addr += 2;
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
- /* Quit now if we're beyond the stop point. */
- if (addr >= stop)
- goto finish_prologue;
+ pv_area_store (stack,
+ pv_add_constant (regs[translate_rreg (rN)], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
- /* Get the next two bytes so the prologue scan can continue. */
- status = deprecated_read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- goto finish_prologue;
- }
+ pc += 4;
+ }
+ /* fmov fsM, (d24, rN) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d24;
+ gdb_byte buf[4];
- /* Now see if we set up a frame pointer via "mov sp,a3" */
- if (buf[0] == 0x3f)
- {
- addr += 1;
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ pv_area_store (stack,
+ pv_add_constant (regs[translate_rreg (rN)], d24),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 6;
+ }
+ /* fmov fsM, (d32, rN) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d32;
+ gdb_byte buf[5];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d32 = extract_signed_integer (&buf[1], 4, byte_order);
- /* The frame pointer is now valid. */
- if (fi)
+ pv_area_store (stack,
+ pv_add_constant (regs[translate_rreg (rN)], d32),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 7;
+ }
+ /* fmov fsM, (d8, SP) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x34)
{
- my_frame_is_in_fp (fi, this_cache);
+ int fsM, sM, Y;
+ LONGEST d8;
+ gdb_byte buf[2];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
+
+ pv_area_store (stack,
+ pv_add_constant (regs[E_SP_REGNUM], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 4;
}
+ /* fmov fsM, (d24, SP) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d24;
+ gdb_byte buf[4];
- /* Quit now if we're beyond the stop point. */
- if (addr >= stop)
- goto finish_prologue;
+ Y = (instr[1] & 0x02) >> 1;
- /* Get two more bytes so scanning can continue. */
- status = deprecated_read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- goto finish_prologue;
- }
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ pv_area_store (stack,
+ pv_add_constant (regs[E_SP_REGNUM], d24),
+ 4, regs[E_FS0_REGNUM + fsM]);
- /* Next we should allocate the local frame. No more prologue insns
- are found after allocating the local frame.
+ pc += 6;
+ }
+ /* fmov fsM, (d32, SP) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d32;
+ gdb_byte buf[5];
- Search for add imm8,sp (0xf8feXX)
- or add imm16,sp (0xfafeXXXX)
- or add imm32,sp (0xfcfeXXXXXXXX).
+ Y = (instr[1] & 0x02) >> 1;
- If none of the above was found, then this prologue has no
- additional stack. */
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
- imm_size = 0;
- if (buf[0] == 0xf8 && buf[1] == 0xfe)
- imm_size = 1;
- else if (buf[0] == 0xfa && buf[1] == 0xfe)
- imm_size = 2;
- else if (buf[0] == 0xfc && buf[1] == 0xfe)
- imm_size = 4;
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d32 = extract_signed_integer (&buf[1], 4, byte_order);
- if (imm_size != 0)
- {
- /* Suck in imm_size more bytes, they'll hold the size of the
- current frame. */
- status = deprecated_read_memory_nobpt (addr + 2, buf, imm_size);
- if (status != 0)
- goto finish_prologue;
+ pv_area_store (stack,
+ pv_add_constant (regs[E_SP_REGNUM], d32),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 7;
+ }
+ /* fmov fsM, (rN+) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ gdb_byte buf[1];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+
+ rN_regnum = translate_rreg (rN);
+
+ pv_area_store (stack, regs[rN_regnum], 4,
+ regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], 4);
+
+ pc += 3;
+ }
+ /* fmov fsM, (rN+, imm8) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm8;
+ gdb_byte buf[2];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm8 = extract_signed_integer (&buf[1], 1, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ pv_area_store (stack, regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm8);
+
+ pc += 4;
+ }
+ /* fmov fsM, (rN+, imm24) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm24;
+ gdb_byte buf[4];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ pv_area_store (stack, regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm24);
+
+ pc += 6;
+ }
+ /* fmov fsM, (rN+, imm32) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm32;
+ gdb_byte buf[5];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm32 = extract_signed_integer (&buf[1], 4, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ pv_area_store (stack, regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm32);
+
+ pc += 7;
+ }
+ /* mov imm8, aN */
+ else if ((instr[0] & 0xf0) == 0x90)
+ {
+ int aN = instr[0] & 0x03;
+ LONGEST imm8;
+
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
+
+ regs[E_A0_REGNUM + aN] = pv_constant (imm8);
+ pc += 2;
+ }
+ /* mov imm16, aN */
+ else if ((instr[0] & 0xfc) == 0x24)
+ {
+ int aN = instr[0] & 0x03;
+ gdb_byte buf[2];
+ LONGEST imm16;
+
+ status = target_read_memory (pc + 1, buf, 2);
+ if (status != 0)
+ break;
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_A0_REGNUM + aN] = pv_constant (imm16);
+ pc += 3;
+ }
+ /* mov imm32, aN */
+ else if (instr[0] == 0xfc && ((instr[1] & 0xfc) == 0xdc))
+ {
+ int aN = instr[1] & 0x03;
+ gdb_byte buf[4];
+ LONGEST imm32;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_A0_REGNUM + aN] = pv_constant (imm32);
+ pc += 6;
+ }
+ /* mov imm8, dN */
+ else if ((instr[0] & 0xf0) == 0x80)
+ {
+ int dN = instr[0] & 0x03;
+ LONGEST imm8;
+
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
- /* Note the size of the stack in the frame info structure. */
- stack_size = extract_signed_integer (buf, imm_size);
- if (fi)
- set_my_stack_size (fi, stack_size);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm8);
+ pc += 2;
+ }
+ /* mov imm16, dN */
+ else if ((instr[0] & 0xfc) == 0x2c)
+ {
+ int dN = instr[0] & 0x03;
+ gdb_byte buf[2];
+ LONGEST imm16;
+
+ status = target_read_memory (pc + 1, buf, 2);
+ if (status != 0)
+ break;
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm16);
+ pc += 3;
+ }
+ /* mov imm32, dN */
+ else if (instr[0] == 0xfc && ((instr[1] & 0xfc) == 0xcc))
+ {
+ int dN = instr[1] & 0x03;
+ gdb_byte buf[4];
+ LONGEST imm32;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm32);
+ pc += 6;
+ }
+ else
+ {
+ /* We've hit some instruction that we don't recognize. Hopefully,
+ we have enough to do prologue analysis. */
+ break;
+ }
+ }
- /* We just consumed 2 + imm_size bytes. */
- addr += 2 + imm_size;
+ /* Is the frame size (offset, really) a known constant? */
+ if (pv_is_register (regs[E_SP_REGNUM], E_SP_REGNUM))
+ result->frame_size = regs[E_SP_REGNUM].k;
- /* No more prologue insns follow, so begin preparation to return. */
- goto finish_prologue;
+ /* Was the frame pointer initialized? */
+ if (pv_is_register (regs[E_A3_REGNUM], E_SP_REGNUM))
+ {
+ result->has_frame_ptr = 1;
+ result->frame_ptr_offset = regs[E_A3_REGNUM].k;
}
- /* Do the essentials and get out of here. */
- finish_prologue:
- /* Note if/where callee saved registers were saved. */
- if (fi)
- set_movm_offsets (fi, this_cache, movm_args);
- return addr;
+
+ /* Record where all the registers were saved. */
+ pv_area_scan (stack, check_for_saved, (void *) result);
+
+ result->prologue_end = after_last_frame_setup_insn;
+
+ do_cleanups (back_to);
}
/* Function: skip_prologue
Return the address of the first inst past the prologue of the function. */
static CORE_ADDR
-mn10300_skip_prologue (CORE_ADDR pc)
+mn10300_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- return mn10300_analyze_prologue (NULL, NULL, pc);
+ const char *name;
+ CORE_ADDR func_addr, func_end;
+ struct mn10300_prologue p;
+
+ /* Try to find the extent of the function that contains PC. */
+ if (!find_pc_partial_function (pc, &name, &func_addr, &func_end))
+ return pc;
+
+ mn10300_analyze_prologue (gdbarch, pc, func_end, &p);
+ return p.prologue_end;
}
-/* Simple frame_unwind_cache.
- This finds the "extra info" for the frame. */
-struct trad_frame_cache *
-mn10300_frame_unwind_cache (struct frame_info *next_frame,
- void **this_prologue_cache)
+/* Wrapper for mn10300_analyze_prologue: find the function start;
+ use the current frame PC as the limit, then
+ invoke mn10300_analyze_prologue and return its result. */
+static struct mn10300_prologue *
+mn10300_analyze_frame_prologue (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- struct trad_frame_cache *cache;
- CORE_ADDR pc, start, end;
-
- if (*this_prologue_cache)
- return (*this_prologue_cache);
-
- cache = trad_frame_cache_zalloc (next_frame);
- pc = gdbarch_unwind_pc (current_gdbarch, next_frame);
- mn10300_analyze_prologue (next_frame, (void **) &cache, pc);
- if (find_pc_partial_function (pc, NULL, &start, &end))
- trad_frame_set_id (cache,
- frame_id_build (trad_frame_get_this_base (cache),
- start));
- else
- trad_frame_set_id (cache,
- frame_id_build (trad_frame_get_this_base (cache),
- frame_func_unwind (next_frame)));
+ if (!*this_prologue_cache)
+ {
+ CORE_ADDR func_start, stop_addr;
+
+ *this_prologue_cache = FRAME_OBSTACK_ZALLOC (struct mn10300_prologue);
+
+ func_start = get_frame_func (this_frame);
+ stop_addr = get_frame_pc (this_frame);
- (*this_prologue_cache) = cache;
- return cache;
+ /* If we couldn't find any function containing the PC, then
+ just initialize the prologue cache, but don't do anything. */
+ if (!func_start)
+ stop_addr = func_start;
+
+ mn10300_analyze_prologue (get_frame_arch (this_frame),
+ func_start, stop_addr, *this_prologue_cache);
+ }
+
+ return *this_prologue_cache;
+}
+
+/* Given the next frame and a prologue cache, return this frame's
+ base. */
+static CORE_ADDR
+mn10300_frame_base (struct frame_info *this_frame, void **this_prologue_cache)
+{
+ struct mn10300_prologue *p
+ = mn10300_analyze_frame_prologue (this_frame, this_prologue_cache);
+
+ /* In functions that use alloca, the distance between the stack
+ pointer and the frame base varies dynamically, so we can't use
+ the SP plus static information like prologue analysis to find the
+ frame base. However, such functions must have a frame pointer,
+ to be able to restore the SP on exit. So whenever we do have a
+ frame pointer, use that to find the base. */
+ if (p->has_frame_ptr)
+ {
+ CORE_ADDR fp = get_frame_register_unsigned (this_frame, E_A3_REGNUM);
+ return fp - p->frame_ptr_offset;
+ }
+ else
+ {
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ return sp - p->frame_size;
+ }
}
/* Here is a dummy implementation. */
static struct frame_id
-mn10300_unwind_dummy_id (struct gdbarch *gdbarch,
- struct frame_info *next_frame)
+mn10300_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
- return frame_id_build (frame_sp_unwind (next_frame),
- frame_pc_unwind (next_frame));
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ CORE_ADDR pc = get_frame_register_unsigned (this_frame, E_PC_REGNUM);
+ return frame_id_build (sp, pc);
}
-/* Trad frame implementation. */
static void
-mn10300_frame_this_id (struct frame_info *next_frame,
+mn10300_frame_this_id (struct frame_info *this_frame,
void **this_prologue_cache,
struct frame_id *this_id)
{
- struct trad_frame_cache *cache =
- mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
+ *this_id = frame_id_build (mn10300_frame_base (this_frame,
+ this_prologue_cache),
+ get_frame_func (this_frame));
- trad_frame_get_id (cache, this_id);
}
-static void
-mn10300_frame_prev_register (struct frame_info *next_frame,
- void **this_prologue_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp)
+static struct value *
+mn10300_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
{
- struct trad_frame_cache *cache =
- mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
-
- trad_frame_get_register (cache, next_frame, regnum, optimizedp,
- lvalp, addrp, realnump, bufferp);
- /* Or...
- trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
- optimizedp, lvalp, addrp, realnump, bufferp);
- */
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame));
+ struct mn10300_prologue *p
+ = mn10300_analyze_frame_prologue (this_frame, this_prologue_cache);
+ CORE_ADDR frame_base = mn10300_frame_base (this_frame, this_prologue_cache);
+ int reg_size = register_size (get_frame_arch (this_frame), regnum);
+
+ if (regnum == E_SP_REGNUM)
+ return frame_unwind_got_constant (this_frame, regnum, frame_base);
+
+ /* If prologue analysis says we saved this register somewhere,
+ return a description of the stack slot holding it. */
+ if (p->reg_offset[regnum] != 1)
+ return frame_unwind_got_memory (this_frame, regnum,
+ frame_base + p->reg_offset[regnum]);
+
+ /* Otherwise, presume we haven't changed the value of this
+ register, and get it from the next frame. */
+ return frame_unwind_got_register (this_frame, regnum, regnum);
}
static const struct frame_unwind mn10300_frame_unwind = {
NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
mn10300_frame_this_id,
- mn10300_frame_prev_register
-};
-
-static CORE_ADDR
-mn10300_frame_base_address (struct frame_info *next_frame,
- void **this_prologue_cache)
-{
- struct trad_frame_cache *cache =
- mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
-
- return trad_frame_get_this_base (cache);
-}
-
-static const struct frame_unwind *
-mn10300_frame_sniffer (struct frame_info *next_frame)
-{
- return &mn10300_frame_unwind;
-}
-
-static const struct frame_base mn10300_frame_base = {
- &mn10300_frame_unwind,
- mn10300_frame_base_address,
- mn10300_frame_base_address,
- mn10300_frame_base_address
+ mn10300_frame_prev_register,
+ NULL,
+ default_frame_sniffer
};
static CORE_ADDR
-mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
ULONGEST pc;
- frame_unwind_unsigned_register (next_frame, E_PC_REGNUM, &pc);
+ pc = frame_unwind_register_unsigned (this_frame, E_PC_REGNUM);
return pc;
}
static CORE_ADDR
-mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
ULONGEST sp;
- frame_unwind_unsigned_register (next_frame, E_SP_REGNUM, &sp);
+ sp = frame_unwind_register_unsigned (this_frame, E_SP_REGNUM);
return sp;
}
static void
mn10300_frame_unwind_init (struct gdbarch *gdbarch)
{
- frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
- frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer);
- frame_base_set_default (gdbarch, &mn10300_frame_base);
- set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id);
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &mn10300_frame_unwind);
+ set_gdbarch_dummy_id (gdbarch, mn10300_dummy_id);
set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
}
int struct_return,
CORE_ADDR struct_addr)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
const int push_size = register_size (gdbarch, E_PC_REGNUM);
int regs_used;
int len, arg_len;
if (struct_return)
{
regs_used = 1;
- write_register (E_D0_REGNUM, struct_addr);
+ regcache_cooked_write_unsigned (regcache, E_D0_REGNUM, struct_addr);
}
else
regs_used = 0;
- /* Push all arguments onto the stack. */
+ /* Push all arguments onto the stack. */
for (argnum = 0; argnum < nargs; argnum++)
{
/* FIXME what about structs? Unions? */
{
/* Change to pointer-to-type. */
arg_len = push_size;
- store_unsigned_integer (valbuf, push_size,
- VALUE_ADDRESS (*args));
+ store_unsigned_integer (valbuf, push_size, byte_order,
+ value_address (*args));
val = &valbuf[0];
}
else
while (regs_used < 2 && arg_len > 0)
{
- write_register (regs_used,
- extract_unsigned_integer (val, push_size));
+ regcache_cooked_write_unsigned (regcache, regs_used,
+ extract_unsigned_integer (val, push_size, byte_order));
val += push_size;
arg_len -= push_size;
regs_used++;
/* Push the return address that contains the magic breakpoint. */
sp -= 4;
- write_memory_unsigned_integer (sp, push_size, bp_addr);
+ write_memory_unsigned_integer (sp, push_size, byte_order, bp_addr);
+
+ /* The CPU also writes the return address always into the
+ MDR register on "call". */
+ regcache_cooked_write_unsigned (regcache, E_MDR_REGNUM, bp_addr);
+
/* Update $sp. */
regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
+
+ /* On the mn10300, it's possible to move some of the stack adjustment
+ and saving of the caller-save registers out of the prologue and
+ into the call sites. (When using gcc, this optimization can
+ occur when using the -mrelax switch.) If this occurs, the dwarf2
+ info will reflect this fact. We can test to see if this is the
+ case by creating a new frame using the current stack pointer and
+ the address of the function that we're about to call. We then
+ unwind SP and see if it's different than the SP of our newly
+ created frame. If the SP values are the same, the caller is not
+ expected to allocate any additional stack. On the other hand, if
+ the SP values are different, the difference determines the
+ additional stack that must be allocated.
+
+ Note that we don't update the return value though because that's
+ the value of the stack just after pushing the arguments, but prior
+ to performing the call. This value is needed in order to
+ construct the frame ID of the dummy call. */
+ {
+ CORE_ADDR func_addr = find_function_addr (target_func, NULL);
+ CORE_ADDR unwound_sp
+ = mn10300_unwind_sp (gdbarch, create_new_frame (sp, func_addr));
+ if (sp != unwound_sp)
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM,
+ sp - (unwound_sp - sp));
+ }
+
return sp;
}
+/* If DWARF2 is a register number appearing in Dwarf2 debug info, then
+ mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
+ register number. Why don't Dwarf2 and GDB use the same numbering?
+ Who knows? But since people have object files lying around with
+ the existing Dwarf2 numbering, and other people have written stubs
+ to work with the existing GDB, neither of them can change. So we
+ just have to cope. */
+static int
+mn10300_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int dwarf2)
+{
+ /* This table is supposed to be shaped like the gdbarch_register_name
+ initializer in gcc/config/mn10300/mn10300.h. Registers which
+ appear in GCC's numbering, but have no counterpart in GDB's
+ world, are marked with a -1. */
+ static int dwarf2_to_gdb[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
+ 15, 16, 17, 18, 19, 20, 21, 22,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+ 9, 11
+ };
+
+ if (dwarf2 < 0
+ || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb))
+ {
+ warning (_("Bogus register number in debug info: %d"), dwarf2);
+ return -1;
+ }
+
+ return dwarf2_to_gdb[dwarf2];
+}
static struct gdbarch *
mn10300_gdbarch_init (struct gdbarch_info info,
{
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
+ int num_regs;
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
case bfd_mach_mn10300:
set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
tdep->am33_mode = 0;
+ num_regs = 32;
break;
case bfd_mach_am33:
set_gdbarch_register_name (gdbarch, am33_register_name);
tdep->am33_mode = 1;
+ num_regs = 32;
+ break;
+ case bfd_mach_am33_2:
+ set_gdbarch_register_name (gdbarch, am33_2_register_name);
+ tdep->am33_mode = 2;
+ num_regs = 64;
+ set_gdbarch_fp0_regnum (gdbarch, 32);
break;
default:
internal_error (__FILE__, __LINE__,
break;
}
+ /* By default, chars are unsigned. */
+ set_gdbarch_char_signed (gdbarch, 0);
+
/* Registers. */
- set_gdbarch_num_regs (gdbarch, E_NUM_REGS);
+ set_gdbarch_num_regs (gdbarch, num_regs);
set_gdbarch_register_type (gdbarch, mn10300_register_type);
set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
/* Stack unwinding. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
/* Breakpoints. */
set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
- /* decr_pc_after_break? */
+ /* decr_pc_after_break? */
/* Disassembly. */
set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
/* Stage 2 */
- /* MVS Note: at least the first one is deprecated! */
- set_gdbarch_deprecated_use_struct_convention (gdbarch,
- mn10300_use_struct_convention);
- set_gdbarch_store_return_value (gdbarch, mn10300_store_return_value);
- set_gdbarch_extract_return_value (gdbarch, mn10300_extract_return_value);
+ set_gdbarch_return_value (gdbarch, mn10300_return_value);
/* Stage 3 -- get target calls working. */
set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
mn10300_frame_unwind_init (gdbarch);
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+
return gdbarch;
}
-/* Dump out the mn10300 specific architecture information. */
+/* Dump out the mn10300 specific architecture information. */
static void
-mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+mn10300_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
tdep->am33_mode);
}
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_mn10300_tdep;
+
void
_initialize_mn10300_tdep (void)
{
projects / external / binutils.git / blobdiff