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* rs6000-tdep.c (rs6000_frame_cache): Handle misdetected frameless

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functions.
This commit is contained in:
Daniel Jacobowitz 2005-09-29 15:37:44 +00:00
parent ef0241e727
commit e10b1c4cbb
2 changed files with 51 additions and 25 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2005-09-29 Daniel Jacobowitz <dan@codesourcery.com>
* rs6000-tdep.c (rs6000_frame_cache): Handle misdetected frameless
functions.
2005-09-29 Nick Roberts <nickrob@snap.net.nz>
* annotate.c (breakpoints_changed, annotate_frames_invalid)

71
gdb/rs6000-tdep.c
View file

@ -2852,6 +2852,7 @@ rs6000_frame_cache (struct frame_info *next_frame, void **this_cache)
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
struct rs6000_framedata fdata;
int wordsize = tdep->wordsize;
CORE_ADDR func, pc;
if ((*this_cache) != NULL)
return (*this_cache);
@ -2859,35 +2860,55 @@ rs6000_frame_cache (struct frame_info *next_frame, void **this_cache)
(*this_cache) = cache;
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
skip_prologue (frame_func_unwind (next_frame), frame_pc_unwind (next_frame),
&fdata);
func = frame_func_unwind (next_frame);
pc = frame_pc_unwind (next_frame);
skip_prologue (func, pc, &fdata);
/* If there were any saved registers, figure out parent's stack
pointer. */
/* The following is true only if the frame doesn't have a call to
alloca(), FIXME. */
/* Figure out the parent's stack pointer. */
if (fdata.saved_fpr == 0
&& fdata.saved_gpr == 0
&& fdata.saved_vr == 0
&& fdata.saved_ev == 0
&& fdata.lr_offset == 0
&& fdata.cr_offset == 0
&& fdata.vr_offset == 0
&& fdata.ev_offset == 0)
cache->base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
else
/* NOTE: cagney/2002-04-14: The ->frame points to the inner-most
address of the current frame. Things might be easier if the
->frame pointed to the outer-most address of the frame. In
the mean time, the address of the prev frame is used as the
base address of this frame. */
cache->base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
/* If the function appears to be frameless, check a couple of likely
indicators that we have simply failed to find the frame setup.
Two common cases of this are missing symbols (i.e.
frame_func_unwind returns the wrong address or 0), and assembly
stubs which have a fast exit path but set up a frame on the slow
path.
If the LR appears to return to this function, then presume that
we have an ABI compliant frame that we failed to find. */
if (fdata.frameless && fdata.lr_offset == 0)
{
/* NOTE: cagney/2002-04-14: The ->frame points to the inner-most
address of the current frame. Things might be easier if the
->frame pointed to the outer-most address of the frame. In
the mean time, the address of the prev frame is used as the
base address of this frame. */
cache->base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
if (!fdata.frameless)
/* Frameless really means stackless. */
cache->base = read_memory_addr (cache->base, wordsize);
CORE_ADDR saved_lr;
int make_frame = 0;
saved_lr = frame_unwind_register_unsigned (next_frame,
tdep->ppc_lr_regnum);
if (func == 0 && saved_lr == pc)
make_frame = 1;
else if (func != 0)
{
CORE_ADDR saved_func = get_pc_function_start (saved_lr);
if (func == saved_func)
make_frame = 1;
}
if (make_frame)
{
fdata.frameless = 0;
fdata.lr_offset = wordsize;
}
}
if (!fdata.frameless)
/* Frameless really means stackless. */
cache->base = read_memory_addr (cache->base, wordsize);
trad_frame_set_value (cache->saved_regs, SP_REGNUM, cache->base);
/* if != -1, fdata.saved_fpr is the smallest number of saved_fpr.