/* Target dependent code for the Motorola 68000 series.
- Copyright (C) 1990, 1992 Free Software Foundation, Inc.
-This file is part of GDB.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000,
+ 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
-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
-(at your option) any later version.
+ This file is part of GDB.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ 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
+ (at your option) any later version.
-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. */
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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. */
#include "defs.h"
+#include "dwarf2-frame.h"
#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
#include "symtab.h"
#include "gdbcore.h"
#include "value.h"
#include "gdb_string.h"
+#include "gdb_assert.h"
#include "inferior.h"
+#include "regcache.h"
+#include "arch-utils.h"
+#include "osabi.h"
+#include "dis-asm.h"
+#include "m68k-tdep.h"
\f
-/* The only reason this is here is the tm-altos.h reference below. It
- was moved back here from tm-m68k.h. FIXME? */
-
-extern CORE_ADDR
-altos_skip_prologue (pc)
- CORE_ADDR pc;
-{
- register int op = read_memory_integer (pc, 2);
- if (op == 0047126)
- pc += 4; /* Skip link #word */
- else if (op == 0044016)
- pc += 6; /* Skip link #long */
- /* Not sure why branches are here. */
- /* From tm-isi.h, tm-altos.h */
- else if (op == 0060000)
- pc += 4; /* Skip bra #word */
- else if (op == 00600377)
- pc += 6; /* skip bra #long */
- else if ((op & 0177400) == 0060000)
- pc += 2; /* skip bra #char */
- return pc;
+
+#define P_LINKL_FP 0x480e
+#define P_LINKW_FP 0x4e56
+#define P_PEA_FP 0x4856
+#define P_MOVEAL_SP_FP 0x2c4f
+#define P_ADDAW_SP 0xdefc
+#define P_ADDAL_SP 0xdffc
+#define P_SUBQW_SP 0x514f
+#define P_SUBQL_SP 0x518f
+#define P_LEA_SP_SP 0x4fef
+#define P_LEA_PC_A5 0x4bfb0170
+#define P_FMOVEMX_SP 0xf227
+#define P_MOVEL_SP 0x2f00
+#define P_MOVEML_SP 0x48e7
+
+
+#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
+#define REGISTER_BYTES_NOFP (16*4 + 8)
+
+/* Offset from SP to first arg on stack at first instruction of a function */
+#define SP_ARG0 (1 * 4)
+
+#if !defined (BPT_VECTOR)
+#define BPT_VECTOR 0xf
+#endif
+
+#if !defined (REMOTE_BPT_VECTOR)
+#define REMOTE_BPT_VECTOR 1
+#endif
+
+
+static const unsigned char *
+m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)};
+ *lenptr = sizeof (break_insn);
+ return break_insn;
}
-/* The only reason this is here is the tm-isi.h reference below. It
- was moved back here from tm-m68k.h. FIXME? */
-
-extern CORE_ADDR
-isi_skip_prologue (pc)
- CORE_ADDR pc;
-{
- register int op = read_memory_integer (pc, 2);
- if (op == 0047126)
- pc += 4; /* Skip link #word */
- else if (op == 0044016)
- pc += 6; /* Skip link #long */
- /* Not sure why branches are here. */
- /* From tm-isi.h, tm-altos.h */
- else if (op == 0060000)
- pc += 4; /* Skip bra #word */
- else if (op == 00600377)
- pc += 6; /* skip bra #long */
- else if ((op & 0177400) == 0060000)
- pc += 2; /* skip bra #char */
- return pc;
+
+static int
+m68k_register_bytes_ok (long numbytes)
+{
+ return ((numbytes == REGISTER_BYTES_FP)
+ || (numbytes == REGISTER_BYTES_NOFP));
}
-/* Return number of args passed to a frame.
- Can return -1, meaning no way to tell. */
+/* Return the GDB type object for the "standard" data type of data in
+ register N. This should be int for D0-D7, SR, FPCONTROL and
+ FPSTATUS, long double for FP0-FP7, and void pointer for all others
+ (A0-A7, PC, FPIADDR). Note, for registers which contain
+ addresses return pointer to void, not pointer to char, because we
+ don't want to attempt to print the string after printing the
+ address. */
-int
-isi_frame_num_args (fi)
- struct frame_info *fi;
+static struct type *
+m68k_register_type (struct gdbarch *gdbarch, int regnum)
{
- int val;
- CORE_ADDR pc = FRAME_SAVED_PC (fi);
- int insn = 0177777 & read_memory_integer (pc, 2);
- val = 0;
- if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
- val = read_memory_integer (pc + 2, 2);
- else if ((insn & 0170777) == 0050217 /* addql #N, sp */
- || (insn & 0170777) == 0050117) /* addqw */
+ if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7)
+ return builtin_type_m68881_ext;
+
+ if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM)
+ return builtin_type_void_func_ptr;
+
+ if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM
+ || regnum == PS_REGNUM)
+ return builtin_type_int32;
+
+ if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7)
+ return builtin_type_void_data_ptr;
+
+ return builtin_type_int32;
+}
+
+/* Function: m68k_register_name
+ Returns the name of the standard m68k register regnum. */
+
+static const char *
+m68k_register_name (int regnum)
+{
+ static char *register_names[] = {
+ "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
+ "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp",
+ "ps", "pc",
+ "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7",
+ "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags"
+ };
+
+ if (regnum < 0 ||
+ regnum >= sizeof (register_names) / sizeof (register_names[0]))
+ internal_error (__FILE__, __LINE__,
+ "m68k_register_name: illegal register number %d", regnum);
+ else
+ return register_names[regnum];
+}
+\f
+/* Extract from an array REGBUF containing the (raw) register state, a
+ function return value of TYPE, and copy that, in virtual format,
+ into VALBUF. */
+
+static void
+m68k_extract_return_value (struct type *type, struct regcache *regcache,
+ void *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+ char buf[M68K_MAX_REGISTER_SIZE];
+
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT
+ && TYPE_NFIELDS (type) == 1)
{
- val = (insn >> 9) & 7;
- if (val == 0)
- val = 8;
+ m68k_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf);
+ return;
}
- else if (insn == 0157774) /* addal #WW, sp */
- val = read_memory_integer (pc + 2, 4);
- val >>= 2;
- return val;
+
+ if (len <= 4)
+ {
+ regcache_raw_read (regcache, M68K_D0_REGNUM, buf);
+ memcpy (valbuf, buf + (4 - len), len);
+ }
+ else if (len <= 8)
+ {
+ regcache_raw_read (regcache, M68K_D0_REGNUM, buf);
+ memcpy (valbuf, buf + (8 - len), len - 4);
+ regcache_raw_read (regcache, M68K_D1_REGNUM,
+ (char *) valbuf + (len - 4));
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ "Cannot extract return value of %d bytes long.", len);
+}
+
+/* Write into the appropriate registers a function return value stored
+ in VALBUF of type TYPE, given in virtual format. */
+
+static void
+m68k_store_return_value (struct type *type, struct regcache *regcache,
+ const void *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT
+ && TYPE_NFIELDS (type) == 1)
+ {
+ m68k_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf);
+ return;
+ }
+
+ if (len <= 4)
+ regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf);
+ else if (len <= 8)
+ {
+ regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len,
+ len - 4, valbuf);
+ regcache_raw_write (regcache, M68K_D0_REGNUM,
+ (char *) valbuf + (len - 4));
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ "Cannot store return value of %d bytes long.", len);
+}
+
+/* Extract from REGCACHE, which contains the (raw) register state, the
+ address in which a function should return its structure value, as a
+ CORE_ADDR. */
+
+static CORE_ADDR
+m68k_extract_struct_value_address (struct regcache *regcache)
+{
+ char buf[4];
+
+ regcache_cooked_read (regcache, M68K_D0_REGNUM, buf);
+ return extract_unsigned_integer (buf, 4);
+}
+
+static int
+m68k_use_struct_convention (int gcc_p, struct type *type)
+{
+ enum struct_return struct_return;
+
+ struct_return = gdbarch_tdep (current_gdbarch)->struct_return;
+ return generic_use_struct_convention (struct_return == reg_struct_return,
+ type);
+}
+
+/* A 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. */
+
+static int
+m68k_frameless_function_invocation (struct frame_info *fi)
+{
+ if (get_frame_type (fi) == SIGTRAMP_FRAME)
+ return 0;
+ else
+ return legacy_frameless_look_for_prologue (fi);
}
int
-delta68_frame_num_args (fi)
- struct frame_info *fi;
+delta68_in_sigtramp (CORE_ADDR pc, char *name)
{
- int val;
- CORE_ADDR pc = FRAME_SAVED_PC (fi);
- int insn = 0177777 & read_memory_integer (pc, 2);
- val = 0;
- if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
- val = read_memory_integer (pc + 2, 2);
- else if ((insn & 0170777) == 0050217 /* addql #N, sp */
- || (insn & 0170777) == 0050117) /* addqw */
+ if (name != NULL)
+ return strcmp (name, "_sigcode") == 0;
+ else
+ return 0;
+}
+
+CORE_ADDR
+delta68_frame_args_address (struct frame_info *frame_info)
+{
+ /* we assume here that the only frameless functions are the system calls
+ or other functions who do not put anything on the stack. */
+ if (get_frame_type (frame_info) == SIGTRAMP_FRAME)
+ return get_frame_base (frame_info) + 12;
+ else if (legacy_frameless_look_for_prologue (frame_info))
{
- val = (insn >> 9) & 7;
- if (val == 0)
- val = 8;
+ /* Check for an interrupted system call */
+ if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME))
+ return get_frame_base (get_next_frame (frame_info)) + 16;
+ else
+ return get_frame_base (frame_info) + 4;
}
- else if (insn == 0157774) /* addal #WW, sp */
- val = read_memory_integer (pc + 2, 4);
- val >>= 2;
- return val;
+ else
+ return get_frame_base (frame_info);
+}
+
+CORE_ADDR
+delta68_frame_saved_pc (struct frame_info *frame_info)
+{
+ return read_memory_unsigned_integer (delta68_frame_args_address (frame_info)
+ + 4, 4);
}
int
-news_frame_num_args (fi)
- struct frame_info *fi;
+delta68_frame_num_args (struct frame_info *fi)
{
int val;
- CORE_ADDR pc = FRAME_SAVED_PC (fi);
- int insn = 0177777 & read_memory_integer (pc, 2);
+ CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi);
+ int insn = read_memory_unsigned_integer (pc, 2);
val = 0;
- if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
+ if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
val = read_memory_integer (pc + 2, 2);
- else if ((insn & 0170777) == 0050217 /* addql #N, sp */
- || (insn & 0170777) == 0050117) /* addqw */
+ else if ((insn & 0170777) == 0050217 /* addql #N, sp */
+ || (insn & 0170777) == 0050117) /* addqw */
{
val = (insn >> 9) & 7;
if (val == 0)
val = 8;
}
- else if (insn == 0157774) /* addal #WW, sp */
+ else if (insn == 0157774) /* addal #WW, sp */
val = read_memory_integer (pc + 2, 4);
val >>= 2;
return val;
}
-/* Push an empty stack frame, to record the current PC, etc. */
-
-void
-m68k_push_dummy_frame ()
+static CORE_ADDR
+m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
+ struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
+ struct value **args, CORE_ADDR sp, int struct_return,
+ CORE_ADDR struct_addr)
{
- register CORE_ADDR sp = read_register (SP_REGNUM);
- register int regnum;
- char raw_buffer[12];
-
- sp = push_word (sp, read_register (PC_REGNUM));
- sp = push_word (sp, read_register (FP_REGNUM));
- write_register (FP_REGNUM, sp);
+ char buf[4];
+ int i;
- /* Always save the floating-point registers, whether they exist on
- this target or not. */
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
+ /* Push arguments in reverse order. */
+ for (i = nargs - 1; i >= 0; i--)
{
- read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
- sp = push_bytes (sp, raw_buffer, 12);
+ struct type *value_type = VALUE_ENCLOSING_TYPE (args[i]);
+ int len = TYPE_LENGTH (value_type);
+ int container_len = (len + 3) & ~3;
+ int offset;
+
+ /* Non-scalars bigger than 4 bytes are left aligned, others are
+ right aligned. */
+ if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (value_type) == TYPE_CODE_UNION
+ || TYPE_CODE (value_type) == TYPE_CODE_ARRAY)
+ && len > 4)
+ offset = 0;
+ else
+ offset = container_len - len;
+ sp -= container_len;
+ write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len);
}
- for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
+ /* Store struct value address. */
+ if (struct_return)
{
- sp = push_word (sp, read_register (regnum));
+ store_unsigned_integer (buf, 4, struct_addr);
+ regcache_cooked_write (regcache, M68K_A1_REGNUM, buf);
}
- sp = push_word (sp, read_register (PS_REGNUM));
- write_register (SP_REGNUM, sp);
+
+ /* Store return address. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, bp_addr);
+ write_memory (sp, buf, 4);
+
+ /* Finally, update the stack pointer... */
+ store_unsigned_integer (buf, 4, sp);
+ regcache_cooked_write (regcache, M68K_SP_REGNUM, buf);
+
+ /* ...and fake a frame pointer. */
+ regcache_cooked_write (regcache, M68K_FP_REGNUM, buf);
+
+ /* DWARF2/GCC uses the stack address *before* the function call as a
+ frame's CFA. */
+ return sp + 8;
}
+\f
+struct m68k_frame_cache
+{
+ /* Base address. */
+ CORE_ADDR base;
+ CORE_ADDR sp_offset;
+ CORE_ADDR pc;
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
+ /* Saved registers. */
+ CORE_ADDR saved_regs[M68K_NUM_REGS];
+ CORE_ADDR saved_sp;
-void
-m68k_pop_frame ()
+ /* Stack space reserved for local variables. */
+ long locals;
+};
+
+/* Allocate and initialize a frame cache. */
+
+static struct m68k_frame_cache *
+m68k_alloc_frame_cache (void)
{
- register struct frame_info *frame = get_current_frame ();
- register CORE_ADDR fp;
- register int regnum;
- struct frame_saved_regs fsr;
- char raw_buffer[12];
+ struct m68k_frame_cache *cache;
+ int i;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache);
+
+ /* Base address. */
+ cache->base = 0;
+ cache->sp_offset = -4;
+ cache->pc = 0;
- fp = FRAME_FP (frame);
- get_frame_saved_regs (frame, &fsr);
- for (regnum = FP0_REGNUM + 7 ; regnum >= FP0_REGNUM ; regnum--)
+ /* Saved registers. We initialize these to -1 since zero is a valid
+ offset (that's where %fp is supposed to be stored). */
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ cache->saved_regs[i] = -1;
+
+ /* Frameless until proven otherwise. */
+ cache->locals = -1;
+
+ return cache;
+}
+
+/* Check whether PC points at a code that sets up a new stack frame.
+ If so, it updates CACHE and returns the address of the first
+ instruction after the sequence that sets removes the "hidden"
+ argument from the stack or CURRENT_PC, whichever is smaller.
+ Otherwise, return PC. */
+
+static CORE_ADDR
+m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc,
+ struct m68k_frame_cache *cache)
+{
+ int op;
+
+ if (pc >= current_pc)
+ return current_pc;
+
+ op = read_memory_unsigned_integer (pc, 2);
+
+ if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP)
{
- if (fsr.regs[regnum])
+ cache->saved_regs[M68K_FP_REGNUM] = 0;
+ cache->sp_offset += 4;
+ if (op == P_LINKW_FP)
+ {
+ /* link.w %fp, #-N */
+ /* link.w %fp, #0; adda.l #-N, %sp */
+ cache->locals = -read_memory_integer (pc + 2, 2);
+
+ if (pc + 4 < current_pc && cache->locals == 0)
+ {
+ op = read_memory_unsigned_integer (pc + 4, 2);
+ if (op == P_ADDAL_SP)
+ {
+ cache->locals = read_memory_integer (pc + 6, 4);
+ return pc + 10;
+ }
+ }
+
+ return pc + 4;
+ }
+ else if (op == P_LINKL_FP)
+ {
+ /* link.l %fp, #-N */
+ cache->locals = -read_memory_integer (pc + 2, 4);
+ return pc + 6;
+ }
+ else
{
- read_memory (fsr.regs[regnum], raw_buffer, 12);
- write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
+ /* pea (%fp); movea.l %sp, %fp */
+ cache->locals = 0;
+
+ if (pc + 2 < current_pc)
+ {
+ op = read_memory_unsigned_integer (pc + 2, 2);
+
+ if (op == P_MOVEAL_SP_FP)
+ {
+ /* move.l %sp, %fp */
+ return pc + 4;
+ }
+ }
+
+ return pc + 2;
}
}
- for (regnum = FP_REGNUM - 1 ; regnum >= 0 ; regnum--)
+ else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP)
{
- if (fsr.regs[regnum])
+ /* subq.[wl] #N,%sp */
+ /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */
+ cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9;
+ if (pc + 2 < current_pc)
{
- write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
+ op = read_memory_unsigned_integer (pc + 2, 2);
+ if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP)
+ {
+ cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9;
+ return pc + 4;
+ }
}
+ return pc + 2;
+ }
+ else if (op == P_ADDAW_SP || op == P_LEA_SP_SP)
+ {
+ /* adda.w #-N,%sp */
+ /* lea (-N,%sp),%sp */
+ cache->locals = -read_memory_integer (pc + 2, 2);
+ return pc + 4;
}
- if (fsr.regs[PS_REGNUM])
+ else if (op == P_ADDAL_SP)
{
- write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4));
+ /* adda.l #-N,%sp */
+ cache->locals = -read_memory_integer (pc + 2, 4);
+ return pc + 6;
}
- write_register (FP_REGNUM, read_memory_integer (fp, 4));
- write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
- write_register (SP_REGNUM, fp + 8);
- flush_cached_frames ();
+
+ return pc;
}
-\f
-/* Given an ip value corresponding to the start of a function,
- return the ip of the first instruction after the function
- prologue. This is the generic m68k support. Machines which
- require something different can override the SKIP_PROLOGUE
- macro to point elsewhere.
+/* Check whether PC points at code that saves registers on the stack.
+ If so, it updates CACHE and returns the address of the first
+ instruction after the register saves or CURRENT_PC, whichever is
+ smaller. Otherwise, return PC. */
- Some instructions which typically may appear in a function
- prologue include:
+static CORE_ADDR
+m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc,
+ struct m68k_frame_cache *cache)
+{
+ if (cache->locals >= 0)
+ {
+ CORE_ADDR offset;
+ int op;
+ int i, mask, regno;
- A link instruction, word form:
+ offset = -4 - cache->locals;
+ while (pc < current_pc)
+ {
+ op = read_memory_unsigned_integer (pc, 2);
+ if (op == P_FMOVEMX_SP)
+ {
+ /* fmovem.x REGS,-(%sp) */
+ op = read_memory_unsigned_integer (pc + 2, 2);
+ if ((op & 0xff00) == 0xe000)
+ {
+ mask = op & 0xff;
+ for (i = 0; i < 16; i++, mask >>= 1)
+ {
+ if (mask & 1)
+ {
+ cache->saved_regs[i + M68K_FP0_REGNUM] = offset;
+ offset -= 12;
+ }
+ }
+ pc += 4;
+ }
+ else
+ break;
+ }
+ else if ((op & 0170677) == P_MOVEL_SP)
+ {
+ /* move.l %R,-(%sp) */
+ regno = ((op & 07000) >> 9) | ((op & 0100) >> 3);
+ cache->saved_regs[regno] = offset;
+ offset -= 4;
+ pc += 2;
+ }
+ else if (op == P_MOVEML_SP)
+ {
+ /* movem.l REGS,-(%sp) */
+ mask = read_memory_unsigned_integer (pc + 2, 2);
+ for (i = 0; i < 16; i++, mask >>= 1)
+ {
+ if (mask & 1)
+ {
+ cache->saved_regs[15 - i] = offset;
+ offset -= 4;
+ }
+ }
+ pc += 4;
+ }
+ else
+ break;
+ }
+ }
- link.w %a6,&0 4e56 XXXX
+ return pc;
+}
- A link instruction, long form:
- link.l %fp,&F%1 480e XXXX XXXX
+/* Do a full analysis of the prologue at PC and update CACHE
+ accordingly. Bail out early if CURRENT_PC is reached. Return the
+ address where the analysis stopped.
- A movm instruction to preserve integer regs:
+ We handle all cases that can be generated by gcc.
- movm.l &M%1,(4,%sp) 48ef XXXX XXXX
+ For allocating a stack frame:
- A fmovm instruction to preserve float regs:
+ link.w %a6,#-N
+ link.l %a6,#-N
+ pea (%fp); move.l %sp,%fp
+ link.w %a6,#0; add.l #-N,%sp
+ subq.l #N,%sp
+ subq.w #N,%sp
+ subq.w #8,%sp; subq.w #N-8,%sp
+ add.w #-N,%sp
+ lea (-N,%sp),%sp
+ add.l #-N,%sp
- fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX
+ For saving registers:
- Some profiling setup code (FIXME, not recognized yet):
+ fmovem.x REGS,-(%sp)
+ move.l R1,-(%sp)
+ move.l R1,-(%sp); move.l R2,-(%sp)
+ movem.l REGS,-(%sp)
- lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX
- bsr _mcount 61ff XXXX XXXX
+ For setting up the PIC register:
- */
+ lea (%pc,N),%a5
-#define P_LINK_L 0x480e
-#define P_LINK_W 0x4e56
-#define P_MOV_L 0x207c
-#define P_JSR 0x4eb9
-#define P_BSR 0x61ff
-#define P_LEA_L 0x43fb
-#define P_MOVM_L 0x48ef
-#define P_FMOVM 0xf237
-#define P_TRAP 0x4e40
+ */
-CORE_ADDR
-m68k_skip_prologue (ip)
-CORE_ADDR ip;
+static CORE_ADDR
+m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc,
+ struct m68k_frame_cache *cache)
{
- register CORE_ADDR limit;
- struct symtab_and_line sal;
- register int op;
-
- /* Find out if there is a known limit for the extent of the prologue.
- If so, ensure we don't go past it. If not, assume "infinity". */
+ unsigned int op;
- sal = find_pc_line (ip, 0);
- limit = (sal.end) ? sal.end : (CORE_ADDR) ~0;
+ pc = m68k_analyze_frame_setup (pc, current_pc, cache);
+ pc = m68k_analyze_register_saves (pc, current_pc, cache);
+ if (pc >= current_pc)
+ return current_pc;
- while (ip < limit)
+ /* Check for GOT setup. */
+ op = read_memory_unsigned_integer (pc, 4);
+ if (op == P_LEA_PC_A5)
{
- op = read_memory_integer (ip, 2);
- op &= 0xFFFF;
-
- if (op == P_LINK_W)
- {
- ip += 4; /* Skip link.w */
- }
- else if (op == 0x4856)
- ip += 2; /* Skip pea %fp */
- else if (op == 0x2c4f)
- ip += 2; /* Skip move.l %sp, %fp */
- else if (op == P_LINK_L)
- {
- ip += 6; /* Skip link.l */
- }
- else if (op == P_MOVM_L)
- {
- ip += 6; /* Skip movm.l */
- }
- else if (op == P_FMOVM)
- {
- ip += 10; /* Skip fmovm */
- }
- else
- {
- break; /* Found unknown code, bail out. */
- }
+ /* lea (%pc,N),%a5 */
+ return pc + 6;
}
- return (ip);
+
+ return pc;
}
-void
-m68k_find_saved_regs (frame_info, saved_regs)
- struct frame_info *frame_info;
- struct frame_saved_regs *saved_regs;
-{
- register int regnum;
- register int regmask;
- register CORE_ADDR next_addr;
- register CORE_ADDR pc;
-
- /* First possible address for a pc in a call dummy for this frame. */
- CORE_ADDR possible_call_dummy_start =
- (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 - 8*12;
-
- int nextinsn;
- memset (saved_regs, 0, sizeof (*saved_regs));
- if ((frame_info)->pc >= possible_call_dummy_start
- && (frame_info)->pc <= (frame_info)->frame)
- {
+/* Return PC of first real instruction. */
- /* It is a call dummy. We could just stop now, since we know
- what the call dummy saves and where. But this code proceeds
- to parse the "prologue" which is part of the call dummy.
- This is needlessly complex and confusing. FIXME. */
+static CORE_ADDR
+m68k_skip_prologue (CORE_ADDR start_pc)
+{
+ struct m68k_frame_cache cache;
+ CORE_ADDR pc;
+ int op;
- next_addr = (frame_info)->frame;
- pc = possible_call_dummy_start;
- }
- else
+ cache.locals = -1;
+ pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache);
+ if (cache.locals < 0)
+ return start_pc;
+ return pc;
+}
+
+static CORE_ADDR
+m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ char buf[8];
+
+ frame_unwind_register (next_frame, PC_REGNUM, buf);
+ return extract_typed_address (buf, builtin_type_void_func_ptr);
+}
+\f
+/* Normal frames. */
+
+static struct m68k_frame_cache *
+m68k_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct m68k_frame_cache *cache;
+ char buf[4];
+ int i;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = m68k_alloc_frame_cache ();
+ *this_cache = cache;
+
+ /* In principle, for normal frames, %fp holds the frame pointer,
+ which holds the base address for the current stack frame.
+ However, for functions that don't need it, the frame pointer is
+ optional. For these "frameless" functions the frame pointer is
+ actually the frame pointer of the calling frame. Signal
+ trampolines are just a special case of a "frameless" function.
+ They (usually) share their frame pointer with the frame that was
+ in progress when the signal occurred. */
+
+ frame_unwind_register (next_frame, M68K_FP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4);
+ if (cache->base == 0)
+ return cache;
+
+ /* For normal frames, %pc is stored at 4(%fp). */
+ cache->saved_regs[M68K_PC_REGNUM] = 4;
+
+ cache->pc = frame_func_unwind (next_frame);
+ if (cache->pc != 0)
+ m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
+
+ if (cache->locals < 0)
{
- pc = get_pc_function_start ((frame_info)->pc);
+ /* We didn't find a valid frame, which means that CACHE->base
+ currently holds the frame pointer for our calling frame. If
+ we're at the start of a function, or somewhere half-way its
+ prologue, the function's frame probably hasn't been fully
+ setup yet. Try to reconstruct the base address for the stack
+ frame by looking at the stack pointer. For truly "frameless"
+ functions this might work too. */
+
+ frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset;
+ }
- if (0x4856 == read_memory_integer (pc, 2)
- && 0x2c4f == read_memory_integer (pc + 2, 2))
- {
- /*
- pea %fp
- move.l %sp, %fp */
+ /* Now that we have the base address for the stack frame we can
+ calculate the value of %sp in the calling frame. */
+ cache->saved_sp = cache->base + 8;
- pc += 4;
- next_addr = frame_info->frame;
- }
- else if (044016 == read_memory_integer (pc, 2))
- /* link.l %fp */
- /* Find the address above the saved
- regs using the amount of storage from the link instruction. */
- next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4;
- else if (047126 == read_memory_integer (pc, 2))
- /* link.w %fp */
- /* Find the address above the saved
- regs using the amount of storage from the link instruction. */
- next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2;
- else goto lose;
-
- /* If have an addal #-n, sp next, adjust next_addr. */
- if ((0177777 & read_memory_integer (pc, 2)) == 0157774)
- next_addr += read_memory_integer (pc += 2, 4), pc += 4;
- }
- regmask = read_memory_integer (pc + 2, 2);
-
- /* Here can come an fmovem. Check for it. */
- nextinsn = 0xffff & read_memory_integer (pc, 2);
- if (0xf227 == nextinsn
- && (regmask & 0xff00) == 0xe000)
- { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)
- if (regmask & 1)
- saved_regs->regs[regnum] = (next_addr -= 12);
- regmask = read_memory_integer (pc + 2, 2); }
-
- /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */
- if (0044327 == read_memory_integer (pc, 2))
- { pc += 4; /* Regmask's low bit is for register 0, the first written */
- for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
- if (regmask & 1)
- saved_regs->regs[regnum] = (next_addr += 4) - 4; }
- else if (0044347 == read_memory_integer (pc, 2))
+ /* Adjust all the saved registers such that they contain addresses
+ instead of offsets. */
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ if (cache->saved_regs[i] != -1)
+ cache->saved_regs[i] += cache->base;
+
+ return cache;
+}
+
+static void
+m68k_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache);
+
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
+
+ /* See the end of m68k_push_dummy_call. */
+ *this_id = frame_id_build (cache->base + 8, cache->pc);
+}
+
+static void
+m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache);
+
+ gdb_assert (regnum >= 0);
+
+ if (regnum == M68K_SP_REGNUM && cache->saved_sp)
{
- pc += 4; /* Regmask's low bit is for register 15, the first pushed */
- for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)
- if (regmask & 1)
- saved_regs->regs[regnum] = (next_addr -= 4);
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ {
+ /* Store the value. */
+ store_unsigned_integer (valuep, 4, cache->saved_sp);
+ }
+ return;
}
- else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))
+
+ if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1)
{
- regnum = 0xf & read_memory_integer (pc, 2); pc += 2;
- saved_regs->regs[regnum] = (next_addr -= 4);
- /* gcc, at least, may use a pair of movel instructions when saving
- exactly 2 registers. */
- if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))
+ *optimizedp = 0;
+ *lvalp = lval_memory;
+ *addrp = cache->saved_regs[regnum];
+ *realnump = -1;
+ if (valuep)
{
- regnum = 0xf & read_memory_integer (pc, 2);
- pc += 2;
- saved_regs->regs[regnum] = (next_addr -= 4);
+ /* Read the value in from memory. */
+ read_memory (*addrp, valuep,
+ register_size (current_gdbarch, regnum));
}
+ return;
}
- /* fmovemx to index of sp may follow. */
- regmask = read_memory_integer (pc + 2, 2);
- nextinsn = 0xffff & read_memory_integer (pc, 2);
- if (0xf236 == nextinsn
- && (regmask & 0xff00) == 0xf000)
- { pc += 10; /* Regmask's low bit is for register fp0, the first written */
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)
- if (regmask & 1)
- saved_regs->regs[regnum] = (next_addr += 12) - 12;
- regmask = read_memory_integer (pc + 2, 2); }
-
- /* clrw -(sp); movw ccr,-(sp) may follow. */
- if (0x426742e7 == read_memory_integer (pc, 4))
- saved_regs->regs[PS_REGNUM] = (next_addr -= 4);
- lose: ;
- saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8;
- saved_regs->regs[FP_REGNUM] = (frame_info)->frame;
- saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4;
-#ifdef SIG_SP_FP_OFFSET
- /* Adjust saved SP_REGNUM for fake _sigtramp frames. */
- if (frame_info->signal_handler_caller && frame_info->next)
- saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET;
-#endif
+ frame_register_unwind (next_frame, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m68k_frame_unwind =
+{
+ NORMAL_FRAME,
+ m68k_frame_this_id,
+ m68k_frame_prev_register
+};
+
+static const struct frame_unwind *
+m68k_frame_sniffer (struct frame_info *next_frame)
+{
+ return &m68k_frame_unwind;
+}
+\f
+/* Signal trampolines. */
+
+static struct m68k_frame_cache *
+m68k_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct m68k_frame_cache *cache;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ struct m68k_sigtramp_info info;
+ char buf[4];
+ int i;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = m68k_alloc_frame_cache ();
+
+ frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4) - 4;
+
+ info = tdep->get_sigtramp_info (next_frame);
+
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ if (info.sc_reg_offset[i] != -1)
+ cache->saved_regs[i] = info.sigcontext_addr + info.sc_reg_offset[i];
+
+ *this_cache = cache;
+ return cache;
}
+static void
+m68k_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m68k_frame_cache *cache =
+ m68k_sigtramp_frame_cache (next_frame, this_cache);
+
+ /* See the end of m68k_push_dummy_call. */
+ *this_id = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame));
+}
+
+static void
+m68k_sigtramp_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ /* Make sure we've initialized the cache. */
+ m68k_sigtramp_frame_cache (next_frame, this_cache);
+
+ m68k_frame_prev_register (next_frame, this_cache, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m68k_sigtramp_frame_unwind =
+{
+ SIGTRAMP_FRAME,
+ m68k_sigtramp_frame_this_id,
+ m68k_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+m68k_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ char *name;
-#ifdef USE_PROC_FS /* Target dependent support for /proc */
+ /* We shouldn't even bother to try if the OSABI didn't register
+ a get_sigtramp_info handler. */
+ if (!gdbarch_tdep (current_gdbarch)->get_sigtramp_info)
+ return NULL;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (DEPRECATED_PC_IN_SIGTRAMP (pc, name))
+ return &m68k_sigtramp_frame_unwind;
+
+ return NULL;
+}
+\f
+static CORE_ADDR
+m68k_frame_base_address (struct frame_info *next_frame, void **this_cache)
+{
+ struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache);
+
+ return cache->base;
+}
+
+static const struct frame_base m68k_frame_base =
+{
+ &m68k_frame_unwind,
+ m68k_frame_base_address,
+ m68k_frame_base_address,
+ m68k_frame_base_address
+};
+
+static struct frame_id
+m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ char buf[4];
+ CORE_ADDR fp;
+
+ frame_unwind_register (next_frame, M68K_FP_REGNUM, buf);
+ fp = extract_unsigned_integer (buf, 4);
+
+ /* See the end of m68k_push_dummy_call. */
+ return frame_id_build (fp + 8, frame_pc_unwind (next_frame));
+}
+\f
+#ifdef USE_PROC_FS /* Target dependent support for /proc */
#include <sys/procfs.h>
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
+
/* The /proc interface divides the target machine's register set up into
- two different sets, the general register set (gregset) and the floating
- point register set (fpregset). For each set, there is an ioctl to get
- the current register set and another ioctl to set the current values.
+ two different sets, the general register set (gregset) and the floating
+ point register set (fpregset). For each set, there is an ioctl to get
+ the current register set and another ioctl to set the current values.
- The actual structure passed through the ioctl interface is, of course,
- naturally machine dependent, and is different for each set of registers.
- For the m68k for example, the general register set is typically defined
- by:
+ The actual structure passed through the ioctl interface is, of course,
+ naturally machine dependent, and is different for each set of registers.
+ For the m68k for example, the general register set is typically defined
+ by:
- typedef int gregset_t[18];
+ typedef int gregset_t[18];
- #define R_D0 0
- ...
- #define R_PS 17
+ #define R_D0 0
+ ...
+ #define R_PS 17
- and the floating point set by:
+ and the floating point set by:
- typedef struct fpregset {
- int f_pcr;
- int f_psr;
- int f_fpiaddr;
- int f_fpregs[8][3]; (8 regs, 96 bits each)
- } fpregset_t;
+ typedef struct fpregset {
+ int f_pcr;
+ int f_psr;
+ int f_fpiaddr;
+ int f_fpregs[8][3]; (8 regs, 96 bits each)
+ } fpregset_t;
- These routines provide the packing and unpacking of gregset_t and
- fpregset_t formatted data.
+ These routines provide the packing and unpacking of gregset_t and
+ fpregset_t formatted data.
*/
#endif
/* Given a pointer to a general register set in /proc format (gregset_t *),
- unpack the register contents and supply them as gdb's idea of the current
- register values. */
+ unpack the register contents and supply them as gdb's idea of the current
+ register values. */
void
-supply_gregset (gregsetp)
-gregset_t *gregsetp;
+supply_gregset (gregset_t *gregsetp)
{
- register int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ int regi;
+ greg_t *regp = (greg_t *) gregsetp;
- for (regi = 0 ; regi < R_PC ; regi++)
+ for (regi = 0; regi < R_PC; regi++)
{
supply_register (regi, (char *) (regp + regi));
}
}
void
-fill_gregset (gregsetp, regno)
-gregset_t *gregsetp;
-int regno;
+fill_gregset (gregset_t *gregsetp, int regno)
{
- register int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ int regi;
+ greg_t *regp = (greg_t *) gregsetp;
- for (regi = 0 ; regi < R_PC ; regi++)
+ for (regi = 0; regi < R_PC; regi++)
{
- if ((regno == -1) || (regno == regi))
- {
- *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)];
- }
- }
- if ((regno == -1) || (regno == PS_REGNUM))
- {
- *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
- }
- if ((regno == -1) || (regno == PC_REGNUM))
- {
- *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
+ if (regno == -1 || regno == regi)
+ regcache_collect (regi, regp + regi);
}
+ if (regno == -1 || regno == PS_REGNUM)
+ regcache_collect (PS_REGNUM, regp + R_PS);
+ if (regno == -1 || regno == PC_REGNUM)
+ regcache_collect (PC_REGNUM, regp + R_PC);
}
#if defined (FP0_REGNUM)
/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), unpack the register contents and supply them as gdb's
- idea of the current floating point register values. */
+ (fpregset_t *), unpack the register contents and supply them as gdb's
+ idea of the current floating point register values. */
-void
-supply_fpregset (fpregsetp)
-fpregset_t *fpregsetp;
+void
+supply_fpregset (fpregset_t *fpregsetp)
{
- register int regi;
+ int regi;
char *from;
-
- for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++)
+
+ for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++)
{
- from = (char *) &(fpregsetp -> f_fpregs[regi-FP0_REGNUM][0]);
+ from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
supply_register (regi, from);
}
- supply_register (FPC_REGNUM, (char *) &(fpregsetp -> f_pcr));
- supply_register (FPS_REGNUM, (char *) &(fpregsetp -> f_psr));
- supply_register (FPI_REGNUM, (char *) &(fpregsetp -> f_fpiaddr));
+ supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
+ supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr));
+ supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
}
/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), update the register specified by REGNO from gdb's idea
- of the current floating point register set. If REGNO is -1, update
- them all. */
+ (fpregset_t *), update the register specified by REGNO from gdb's idea
+ of the current floating point register set. If REGNO is -1, update
+ them all. */
void
-fill_fpregset (fpregsetp, regno)
-fpregset_t *fpregsetp;
-int regno;
+fill_fpregset (fpregset_t *fpregsetp, int regno)
{
int regi;
- char *to;
- char *from;
- for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++)
- {
- if ((regno == -1) || (regno == regi))
- {
- from = (char *) ®isters[REGISTER_BYTE (regi)];
- to = (char *) &(fpregsetp -> f_fpregs[regi-FP0_REGNUM][0]);
- memcpy (to, from, REGISTER_RAW_SIZE (regi));
- }
- }
- if ((regno == -1) || (regno == FPC_REGNUM))
- {
- fpregsetp -> f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)];
- }
- if ((regno == -1) || (regno == FPS_REGNUM))
- {
- fpregsetp -> f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)];
- }
- if ((regno == -1) || (regno == FPI_REGNUM))
+ for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++)
{
- fpregsetp -> f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)];
+ if (regno == -1 || regno == regi)
+ regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
}
+ if (regno == -1 || regno == M68K_FPC_REGNUM)
+ regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr);
+ if (regno == -1 || regno == M68K_FPS_REGNUM)
+ regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr);
+ if (regno == -1 || regno == M68K_FPI_REGNUM)
+ regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr);
}
-#endif /* defined (FP0_REGNUM) */
+#endif /* defined (FP0_REGNUM) */
-#endif /* USE_PROC_FS */
+#endif /* USE_PROC_FS */
-#ifdef GET_LONGJMP_TARGET
/* Figure out where the longjmp will land. Slurp the args out of the stack.
We expect the first arg to be a pointer to the jmp_buf structure from which
we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
This routine returns true on success. */
int
-get_longjmp_target(pc)
- CORE_ADDR *pc;
+m68k_get_longjmp_target (CORE_ADDR *pc)
{
- char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+ char *buf;
CORE_ADDR sp, jb_addr;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- sp = read_register(SP_REGNUM);
+ if (tdep->jb_pc < 0)
+ {
+ internal_error (__FILE__, __LINE__,
+ "m68k_get_longjmp_target: not implemented");
+ return 0;
+ }
- if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
- buf,
- TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ sp = read_register (SP_REGNUM);
+
+ if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
+ buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
return 0;
- jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
- if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
+ if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf,
TARGET_PTR_BIT / TARGET_CHAR_BIT))
return 0;
- *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
+ *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
return 1;
}
-#endif /* GET_LONGJMP_TARGET */
-/* Immediately after a function call, return the saved pc before the frame
- is setup. For sun3's, we check for the common case of being inside of a
- system call, and if so, we know that Sun pushes the call # on the stack
- prior to doing the trap. */
+/* Function: m68k_gdbarch_init
+ Initializer function for the m68k gdbarch vector.
+ Called by gdbarch. Sets up the gdbarch vector(s) for this target. */
-CORE_ADDR
-m68k_saved_pc_after_call(frame)
- struct frame_info *frame;
+static struct gdbarch *
+m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
-#ifdef SYSCALL_TRAP
- int op;
+ struct gdbarch_tdep *tdep = NULL;
+ struct gdbarch *gdbarch;
- op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
+ /* find a candidate among the list of pre-declared architectures. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return (arches->gdbarch);
- if (op == SYSCALL_TRAP)
- return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
- else
-#endif /* SYSCALL_TRAP */
- return read_memory_integer (read_register (SP_REGNUM), 4);
+ tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext);
+ set_gdbarch_long_double_bit (gdbarch, 96);
+
+ set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue);
+ set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc);
+
+ /* Stack grows down. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ set_gdbarch_parm_boundary (gdbarch, 32);
+
+ set_gdbarch_believe_pcc_promotion (gdbarch, 1);
+ set_gdbarch_decr_pc_after_break (gdbarch, 2);
+
+ set_gdbarch_extract_return_value (gdbarch, m68k_extract_return_value);
+ set_gdbarch_store_return_value (gdbarch, m68k_store_return_value);
+ set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68k_extract_struct_value_address);
+ set_gdbarch_use_struct_convention (gdbarch, m68k_use_struct_convention);
+
+ set_gdbarch_deprecated_frameless_function_invocation (gdbarch, m68k_frameless_function_invocation);
+ set_gdbarch_frame_args_skip (gdbarch, 8);
+
+ set_gdbarch_register_type (gdbarch, m68k_register_type);
+ set_gdbarch_register_name (gdbarch, m68k_register_name);
+ set_gdbarch_num_regs (gdbarch, 29);
+ set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok);
+ set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM);
+ set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM);
+ set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM);
+
+ set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call);
+
+ /* Disassembler. */
+ set_gdbarch_print_insn (gdbarch, print_insn_m68k);
+
+#if defined JB_PC && defined JB_ELEMENT_SIZE
+ tdep->jb_pc = JB_PC;
+ tdep->jb_elt_size = JB_ELEMENT_SIZE;
+#else
+ tdep->jb_pc = -1;
+#endif
+ tdep->get_sigtramp_info = NULL;
+ tdep->struct_return = pcc_struct_return;
+
+ /* Frame unwinder. */
+ set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc);
+
+ /* Hook in the DWARF CFI frame unwinder. */
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+
+ frame_base_set_default (gdbarch, &m68k_frame_base);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+
+ /* Now we have tuned the configuration, set a few final things,
+ based on what the OS ABI has told us. */
+
+ if (tdep->jb_pc >= 0)
+ set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target);
+
+ frame_unwind_append_sniffer (gdbarch, m68k_sigtramp_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer);
+
+ return gdbarch;
+}
+
+
+static void
+m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ if (tdep == NULL)
+ return;
}
+extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */
+
void
-_initialize_m68k_tdep ()
+_initialize_m68k_tdep (void)
{
- tm_print_insn = print_insn_m68k;
+ gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep);
}
projects / deliverable / binutils-gdb.git / blobdiff