/* Target dependent code for the Motorola 68000 series.
- Copyright (C) 1990, 1992 Free Software Foundation, Inc.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001,
+ 2002, 2003
+ Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.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 "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
+
+
+/* gdbarch_breakpoint_from_pc is set to m68k_local_breakpoint_from_pc
+ so m68k_remote_breakpoint_from_pc is currently not used. */
+
+static const unsigned char *
+m68k_remote_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static unsigned char break_insn[] = {0x4e, (0x40 | REMOTE_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 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;
}
-/* Return number of args passed to a frame.
- Can return -1, meaning no way to tell. */
-int
-isi_frame_num_args (fi)
- struct frame_info *fi;
+static int
+m68k_register_bytes_ok (long numbytes)
{
- 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 */
+ return ((numbytes == REGISTER_BYTES_FP)
+ || (numbytes == REGISTER_BYTES_NOFP));
+}
+
+/* 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. */
+
+static struct type *
+m68k_register_type (struct gdbarch *gdbarch, int regnum)
+{
+ 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];
+}
+
+/* Index within `registers' of the first byte of the space for
+ register regnum. */
+
+static int
+m68k_register_byte (int regnum)
+{
+ if (regnum >= M68K_FPC_REGNUM)
+ return (((regnum - M68K_FPC_REGNUM) * 4) + 168);
+ else if (regnum >= FP0_REGNUM)
+ return (((regnum - FP0_REGNUM) * 12) + 72);
+ else
+ return (regnum * 4);
+}
+\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 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 (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 */
val = read_memory_integer (pc + 2, 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)
+{
+ 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;
+
+ /* 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)
{
- register struct frame_info *frame = get_current_frame ();
- register CORE_ADDR fp;
- register int regnum;
- struct frame_saved_regs fsr;
- char raw_buffer[12];
+ int op;
- fp = FRAME_FP (frame);
- get_frame_saved_regs (frame, &fsr);
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
+ 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)
{
- read_memory (fsr.regs[regnum], raw_buffer, 12);
- write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
+ /* 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
+ {
+ /* 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);
-}
-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;
+}
- /* 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. */
+/* Return PC of first real instruction. */
- next_addr = (frame_info)->frame;
- pc = possible_call_dummy_start;
- }
- else
- {
- pc = get_pc_function_start ((frame_info)->pc);
+static CORE_ADDR
+m68k_skip_prologue (CORE_ADDR start_pc)
+{
+ struct m68k_frame_cache cache;
+ CORE_ADDR pc;
+ int op;
- if (0x4856 == read_memory_integer (pc, 2)
- && 0x2c4f == read_memory_integer (pc + 2, 2))
- {
- /*
- pea %fp
- move.l %sp, %fp */
+ cache.locals = -1;
+ pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache);
+ if (cache.locals < 0)
+ return start_pc;
+ return pc;
+}
- 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;
+static CORE_ADDR
+m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ char buf[8];
- /* 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);
+ frame_unwind_register (next_frame, PC_REGNUM, buf);
+ return extract_typed_address (buf, builtin_type_void_func_ptr);
+}
+\f
+/* Normal frames. */
- /* Here can come an fmovem. Check for it. */
- nextinsn = 0xffff & read_memory_integer (pc, 2);
- if (0xf227 == nextinsn
- && (regmask & 0xff00) == 0xe000)
+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 += 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);
+ /* 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;
}
- /* 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))
- {
- 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);
- }
- else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))
+ /* 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;
+
+ /* 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)
{
- 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 = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
{
- regnum = 0xf & read_memory_integer (pc, 2);
- pc += 2;
- saved_regs->regs[regnum] = (next_addr -= 4);
+ /* Store the value. */
+ store_unsigned_integer (valuep, 4, cache->saved_sp);
}
+ 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)
+ if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1)
{
- 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);
+ *optimizedp = 0;
+ *lvalp = lval_memory;
+ *addrp = cache->saved_regs[regnum];
+ *realnump = -1;
+ if (valuep)
+ {
+ /* Read the value in from memory. */
+ read_memory (*addrp, valuep,
+ register_size (current_gdbarch, regnum));
+ }
+ return;
}
- /* 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;
+
+ /* 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 (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
register values. */
void
-supply_gregset (gregsetp)
- gregset_t *gregsetp;
+supply_gregset (gregset_t *gregsetp)
{
register int regi;
register greg_t *regp = (greg_t *) gregsetp;
}
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;
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)
idea of the current floating point register values. */
void
-supply_fpregset (fpregsetp)
- fpregset_t *fpregsetp;
+supply_fpregset (fpregset_t *fpregsetp)
{
register 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]);
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
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))
+ for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++)
{
- 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))
- {
- 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 /* 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);
+ if (tdep->jb_pc < 0)
+ {
+ internal_error (__FILE__, __LINE__,
+ "m68k_get_longjmp_target: not implemented");
+ return 0;
+ }
+
+ 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))
+ 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 */
+#ifdef SYSCALL_TRAP
/* 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. */
-CORE_ADDR
-m68k_saved_pc_after_call (frame)
- struct frame_info *frame;
+static CORE_ADDR
+m68k_saved_pc_after_call (struct frame_info *frame)
{
-#ifdef SYSCALL_TRAP
int op;
- op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
+ op = read_memory_unsigned_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
if (op == SYSCALL_TRAP)
- return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
+ return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4);
else
+ return read_memory_unsigned_integer (read_register (SP_REGNUM), 4);
+}
#endif /* SYSCALL_TRAP */
- return read_memory_integer (read_register (SP_REGNUM), 4);
+
+/* Function: m68k_gdbarch_init
+ Initializer function for the m68k gdbarch vector.
+ Called by gdbarch. Sets up the gdbarch vector(s) for this target. */
+
+static struct gdbarch *
+m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch_tdep *tdep = NULL;
+ struct gdbarch *gdbarch;
+
+ /* find a candidate among the list of pre-declared architectures. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return (arches->gdbarch);
+
+ 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_function_start_offset (gdbarch, 0);
+
+ set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue);
+#ifdef SYSCALL_TRAP
+ set_gdbarch_deprecated_saved_pc_after_call (gdbarch, m68k_saved_pc_after_call);
+#endif
+ 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_extract_struct_value_address (gdbarch,
+ m68k_extract_struct_value_address);
+ set_gdbarch_use_struct_convention (gdbarch, m68k_use_struct_convention);
+
+ set_gdbarch_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);
+ 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