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* rs6000-tdep.c (frame_saved_pc): Check for signal handler caller

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before trying to determine the start of the function.
	(skip_prologue):  Skip subroutine call which might save the
	floating point registers only if it is within the first three
	instructions.
	Reinstate setting of alloca_reg if setup of a gcc frame pointer
	is found.
	(frame_get_cache_fsr):  Use new fields in rs6000_framedata.
This commit is contained in:
Peter Schauer 1995-07-30 08:45:15 +00:00
parent 7a13a704fe
commit 965dde97f0
1 changed files with 35 additions and 14 deletions
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49
gdb/rs6000-tdep.c
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@ -292,6 +292,12 @@ skip_prologue (pc, fdata)
continue;
} else if ((op & 0xfc000000) == 0x48000000) { /* bl foo, to save fprs??? */
/* Don't skip over the subroutine call if it is not within the first
three instructions of the prologue. */
if ((pc - orig_pc) > 8)
break;
op = read_memory_integer (pc+4, 4);
/* At this point, make sure this is not a trampoline function
@ -300,7 +306,7 @@ skip_prologue (pc, fdata)
prologue. */
if (op == 0x4def7b82 || op == 0) /* crorc 15, 15, 15 */
return pc; /* don't skip over this branch */
break; /* don't skip over this branch */
continue;
@ -335,6 +341,7 @@ skip_prologue (pc, fdata)
} else if (op == 0x603f0000 /* oril r31, r1, 0x0 */
|| op == 0x7c3f0b78) { /* mr r31, r1 */
framep = 1;
fdata->alloca_reg = 31;
continue;
} else {
@ -927,6 +934,9 @@ frame_saved_pc (fi)
struct rs6000_framedata fdata;
int frameless;
if (fi->signal_handler_caller)
return read_memory_integer (fi->frame + SIG_FRAME_PC_OFFSET, 4);
func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;
/* If we failed to find the start of the function, it is a mistake
@ -936,9 +946,6 @@ frame_saved_pc (fi)
(void) skip_prologue (func_start, &fdata);
if (fi->signal_handler_caller)
return read_memory_integer (fi->frame + SIG_FRAME_PC_OFFSET, 4);
if (fdata.lr_offset == 0 && fi->next != NULL)
return read_memory_integer (rs6000_frame_chain (fi) + DEFAULT_LR_SAVE, 4);
@ -979,22 +986,36 @@ frame_get_cache_fsr (fi, fdatap)
frame_addr = read_memory_integer (fi->frame, 4);
/* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
All fpr's from saved_fpr to fp31 are saved right underneath caller
stack pointer, starting from fp31 first. */
All fpr's from saved_fpr to fp31 are saved. */
if (fdatap->saved_fpr >= 0) {
for (ii=31; ii >= fdatap->saved_fpr; --ii)
fi->cache_fsr->regs [FP0_REGNUM + ii] = frame_addr - ((32 - ii) * 8);
frame_addr -= (32 - fdatap->saved_fpr) * 8;
int fpr_offset = frame_addr + fdatap->fpr_offset;
for (ii = fdatap->saved_fpr; ii < 32; ii++) {
fi->cache_fsr->regs [FP0_REGNUM + ii] = fpr_offset;
fpr_offset += 8;
}
}
/* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
All gpr's from saved_gpr to gpr31 are saved right under saved fprs,
starting from r31 first. */
All gpr's from saved_gpr to gpr31 are saved. */
if (fdatap->saved_gpr >= 0)
for (ii=31; ii >= fdatap->saved_gpr; --ii)
fi->cache_fsr->regs [ii] = frame_addr - ((32 - ii) * 4);
if (fdatap->saved_gpr >= 0) {
int gpr_offset = frame_addr + fdatap->gpr_offset;
for (ii = fdatap->saved_gpr; ii < 32; ii++) {
fi->cache_fsr->regs [ii] = gpr_offset;
gpr_offset += 4;
}
}
/* If != 0, fdatap->cr_offset is the offset from the frame that holds
the CR. */
if (fdatap->cr_offset != 0)
fi->cache_fsr->regs [CR_REGNUM] = frame_addr + fdatap->cr_offset;
/* If != 0, fdatap->lr_offset is the offset from the frame that holds
the LR. */
if (fdatap->lr_offset != 0)
fi->cache_fsr->regs [LR_REGNUM] = frame_addr + fdatap->lr_offset;
}
/* Return the address of a frame. This is the inital %sp value when the frame