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-rw-r--r--gdb/m68k-tdep.c97
1 files changed, 73 insertions, 24 deletions
diff --git a/gdb/m68k-tdep.c b/gdb/m68k-tdep.c
index 05a3e50fdec..2ddb1eb9b21 100644
--- a/gdb/m68k-tdep.c
+++ b/gdb/m68k-tdep.c
@@ -41,6 +41,8 @@
#define P_FMOVM 0xf237
#define P_TRAP 0x4e40
+void m68k_frame_init_saved_regs (struct frame_info *frame_info);
+
/* The only reason this is here is the tm-altos.h reference below. It
was moved back here from tm-m68k.h. FIXME? */
@@ -166,6 +168,19 @@ news_frame_num_args (struct frame_info *fi)
return val;
}
+/* Insert the specified number of args and function address
+ into a call sequence of the above form stored at DUMMYNAME.
+ We use the BFD routines to store a big-endian value of known size. */
+
+void
+m68k_fix_call_dummy(char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ struct value **args, struct type *type, int gcc_p)
+{
+ bfd_putb32 (fun, (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 2);
+ bfd_putb32 (nargs*4, (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 8);
+}
+
+
/* Push an empty stack frame, to record the current PC, etc. */
void
@@ -204,30 +219,29 @@ m68k_pop_frame (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];
fp = FRAME_FP (frame);
- get_frame_saved_regs (frame, &fsr);
+ m68k_frame_init_saved_regs (frame);
for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
{
- if (fsr.regs[regnum])
+ if (frame->saved_regs[regnum])
{
- read_memory (fsr.regs[regnum], raw_buffer, 12);
+ read_memory (frame->saved_regs[regnum], raw_buffer, 12);
write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
}
}
for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
{
- if (fsr.regs[regnum])
+ if (frame->saved_regs[regnum])
{
- write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
+ write_register (regnum, read_memory_integer (frame->saved_regs[regnum], 4));
}
}
- if (fsr.regs[PS_REGNUM])
+ if (frame->saved_regs[PS_REGNUM])
{
write_register (PS_REGNUM,
- read_memory_integer (fsr.regs[PS_REGNUM], 4));
+ read_memory_integer (frame->saved_regs[PS_REGNUM], 4));
}
write_register (FP_REGNUM, read_memory_integer (fp, 4));
write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
@@ -304,9 +318,14 @@ m68k_skip_prologue (CORE_ADDR ip)
return (ip);
}
+/* Store the addresses of the saved registers of the frame described by
+ FRAME_INFO in its saved_regs field.
+ This includes special registers such as pc and fp saved in special
+ ways in the stack frame. sp is even more special:
+ the address we return for it IS the sp for the next frame. */
+
void
-m68k_find_saved_regs (struct frame_info *frame_info,
- struct frame_saved_regs *saved_regs)
+m68k_frame_init_saved_regs (struct frame_info *frame_info)
{
register int regnum;
register int regmask;
@@ -315,10 +334,17 @@ m68k_find_saved_regs (struct frame_info *frame_info,
/* 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;
+ (frame_info)->frame - 28 - FP_REGNUM * 4 - 4 - 8 * 12;
int nextinsn;
- memset (saved_regs, 0, sizeof (*saved_regs));
+
+ if (frame_info->saved_regs)
+ return;
+
+ frame_saved_regs_zalloc (frame_info);
+
+ memset (frame_info->saved_regs, 0, SIZEOF_FRAME_SAVED_REGS);
+
if ((frame_info)->pc >= possible_call_dummy_start
&& (frame_info)->pc <= (frame_info)->frame)
{
@@ -378,7 +404,7 @@ m68k_find_saved_regs (struct frame_info *frame_info,
/* Regmask's low bit is for register fp7, the first pushed */
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
if (regmask & 1)
- saved_regs->regs[regnum] = (next_addr -= 12);
+ frame_info->saved_regs[regnum] = (next_addr -= 12);
pc += 4;
}
/* fmovemx to (fp + displacement) */
@@ -391,7 +417,7 @@ m68k_find_saved_regs (struct frame_info *frame_info,
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
if (regmask & 1)
{
- saved_regs->regs[regnum] = addr;
+ frame_info->saved_regs[regnum] = addr;
addr += 12;
}
pc += 6;
@@ -403,7 +429,7 @@ m68k_find_saved_regs (struct frame_info *frame_info,
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
if (regmask & 1)
{
- saved_regs->regs[regnum] = next_addr;
+ frame_info->saved_regs[regnum] = next_addr;
next_addr += 4;
}
pc += 4;
@@ -418,7 +444,7 @@ m68k_find_saved_regs (struct frame_info *frame_info,
for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
if (regmask & 1)
{
- saved_regs->regs[regnum] = addr;
+ frame_info->saved_regs[regnum] = addr;
addr += 4;
}
pc += 6;
@@ -429,14 +455,14 @@ m68k_find_saved_regs (struct frame_info *frame_info,
/* Regmask's low bit is for register 15, the first pushed */
for (regnum = 16; --regnum >= 0; regmask >>= 1)
if (regmask & 1)
- saved_regs->regs[regnum] = (next_addr -= 4);
+ frame_info->saved_regs[regnum] = (next_addr -= 4);
pc += 4;
}
/* movl r,-(sp) */
else if (0x2f00 == (0xfff0 & nextinsn))
{
regnum = 0xf & nextinsn;
- saved_regs->regs[regnum] = (next_addr -= 4);
+ frame_info->saved_regs[regnum] = (next_addr -= 4);
pc += 2;
}
/* fmovemx to index of sp */
@@ -446,7 +472,7 @@ m68k_find_saved_regs (struct frame_info *frame_info,
for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
if (regmask & 1)
{
- saved_regs->regs[regnum] = next_addr;
+ frame_info->saved_regs[regnum] = next_addr;
next_addr += 12;
}
pc += 10;
@@ -454,20 +480,21 @@ m68k_find_saved_regs (struct frame_info *frame_info,
/* clrw -(sp); movw ccr,-(sp) */
else if (0x4267 == nextinsn && 0x42e7 == regmask)
{
- saved_regs->regs[PS_REGNUM] = (next_addr -= 4);
+ frame_info->saved_regs[PS_REGNUM] = (next_addr -= 4);
pc += 4;
}
else
break;
}
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;
+ frame_info->saved_regs[SP_REGNUM] = (frame_info)->frame + 8;
+ frame_info->saved_regs[FP_REGNUM] = (frame_info)->frame;
+ frame_info->saved_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;
+ frame_info->saved_regs[SP_REGNUM] =
+ frame_info->next->frame + SIG_SP_FP_OFFSET;
#endif
}
@@ -684,6 +711,9 @@ m68k_saved_pc_after_call (struct frame_info *frame)
static struct gdbarch *
m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
+ static LONGEST call_dummy_words[7] = {0xf227e0ff, 0x48e7fffc, 0x426742e7,
+ 0x4eb93232, 0x3232dffc, 0x69696969,
+ (0x4e404e71 | (BPT_VECTOR << 16))};
struct gdbarch_tdep *tdep = NULL;
struct gdbarch *gdbarch;
@@ -698,6 +728,25 @@ m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
gdbarch = gdbarch_alloc (&info, 0);
+ set_gdbarch_frame_init_saved_regs (gdbarch, m68k_frame_init_saved_regs);
+
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 0);
+ set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+ set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 24);
+ set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack);
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ set_gdbarch_call_dummy_length (gdbarch, 28);
+ set_gdbarch_call_dummy_start_offset (gdbarch, 12);
+
+ set_gdbarch_call_dummy_words (gdbarch, call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_words));
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ set_gdbarch_fix_call_dummy (gdbarch, m68k_fix_call_dummy);
+ set_gdbarch_push_dummy_frame (gdbarch, m68k_push_dummy_frame);
+ set_gdbarch_pop_frame (gdbarch, m68k_pop_frame);
+
return gdbarch;
}
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