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2003-03-05 Andrew Cagney <cagney@redhat.com> 

* d10v-tdep.c (struct d10v_unwind_cache): Add field "base".
	(d10v_frame_unwind_cache): Rewrite code computing the base and SP.
	Do not use d10v_read_sp or d10v_read_fp when obtaining register
	values.
This commit is contained in:
Andrew Cagney 2003-03-05 22:54:22 +00:00
parent 0d84311632
commit ceea51452a
2 changed files with 48 additions and 20 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2003-03-05 Andrew Cagney <cagney@redhat.com>
* d10v-tdep.c (struct d10v_unwind_cache): Add field "base".
(d10v_frame_unwind_cache): Rewrite code computing the base and SP.
Do not use d10v_read_sp or d10v_read_fp when obtaining register
values.
2003-03-05 Andrew Cagney <cagney@redhat.com>
* d10v-tdep.c (struct frame_extra_info): Delete unused structure.

61
gdb/d10v-tdep.c
View File

@ -610,6 +610,8 @@ d10v_skip_prologue (CORE_ADDR pc)
struct d10v_unwind_cache
{
CORE_ADDR return_pc;
/* The frame's base. Used when constructing a frame ID. */
CORE_ADDR base;
int size;
CORE_ADDR *saved_regs;
/* How far the SP and r11 (FP) have been offset from the start of
@ -706,7 +708,9 @@ struct d10v_unwind_cache *
d10v_frame_unwind_cache (struct frame_info *fi,
void **cache)
{
CORE_ADDR fp, pc;
CORE_ADDR pc;
ULONGEST prev_sp;
ULONGEST this_base;
unsigned long op;
unsigned short op1, op2;
int i;
@ -721,8 +725,6 @@ d10v_frame_unwind_cache (struct frame_info *fi,
info->size = 0;
info->return_pc = 0;
fp = get_frame_base (fi);
info->sp_offset = 0;
pc = get_pc_function_start (get_frame_pc (fi));
@ -780,13 +782,43 @@ d10v_frame_unwind_cache (struct frame_info *fi,
info->size = -info->sp_offset;
if (!(fp & 0xffff))
fp = d10v_read_sp ();
/* Compute the frame's base, and the previous frame's SP. */
if (info->uses_frame)
{
/* The SP was moved to the FP. This indicates that a new frame
was created. Get THIS frame's FP value by unwinding it from
the next frame. */
frame_read_unsigned_register (fi, FP_REGNUM, &this_base);
/* The FP points at the last saved register. Adjust the FP back
to before the first saved register giving the SP. */
prev_sp = this_base + info->size;
}
else if (info->saved_regs[SP_REGNUM])
{
/* The SP was saved (which is very unusual), the frame base is
just the PREV's frame's TOP-OF-STACK. */
this_base = read_memory_unsigned_integer (info->saved_regs[SP_REGNUM],
register_size (current_gdbarch,
SP_REGNUM));
prev_sp = this_base;
}
else
{
/* Assume that the FP is this frame's SP but with that pushed
stack space added back. */
frame_read_unsigned_register (fi, SP_REGNUM, &this_base);
prev_sp = this_base + info->size;
}
info->base = d10v_make_daddr (this_base);
prev_sp = d10v_make_daddr (prev_sp);
/* Adjust all the saved registers so that they contain addresses and
not offsets. */
for (i = 0; i < NUM_REGS - 1; i++)
if (info->saved_regs[i])
{
info->saved_regs[i] = fp - (info->sp_offset - info->saved_regs[i]);
info->saved_regs[i] = (prev_sp + info->saved_regs[i]);
}
if (info->saved_regs[LR_REGNUM])
@ -803,20 +835,9 @@ d10v_frame_unwind_cache (struct frame_info *fi,
info->return_pc = d10v_make_iaddr (return_pc);
}
/* The SP is not normally (ever?) saved, but check anyway */
if (!info->saved_regs[SP_REGNUM])
{
/* if the FP was saved, that means the current FP is valid, */
/* otherwise, it isn't being used, so we use the SP instead */
if (info->uses_frame)
info->saved_regs[SP_REGNUM]
= d10v_read_fp () + info->size;
else
{
info->saved_regs[SP_REGNUM] = fp + info->size;
info->saved_regs[FP_REGNUM] = 0;
}
}
/* The SP_REGNUM is special. Instead of the address of the SP, the
previous frame's SP value is saved. */
info->saved_regs[SP_REGNUM] = prev_sp;
return info;
}