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2004-05-18 Randolph Chung <tausq@debian.org>

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* hppa-tdep.c (hppa_frame_cache): If a frame pointer is available, use
	it for unwinding the stack.
This commit is contained in:
Randolph Chung
2004-05-19 02:38:28 +00:00
parent 6310063290
commit ed70ba000b
2 changed files with 38 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2004-05-18 Randolph Chung <tausq@debian.org>
* hppa-tdep.c (hppa_frame_cache): If a frame pointer is available, use
it for unwinding the stack.
2004-05-18 Randolph Chung <tausq@debian.org> 2004-05-18 Randolph Chung <tausq@debian.org>
* config/pa/tm-linux.h (IN_SOLIB_CALL_TRAMPOLINE, SKIP_TRAMPOLINE_CODE) * config/pa/tm-linux.h (IN_SOLIB_CALL_TRAMPOLINE, SKIP_TRAMPOLINE_CODE)

34
gdb/hppa-tdep.c
View File

@ -1725,6 +1725,7 @@ hppa_frame_cache (struct frame_info *next_frame, void **this_cache)
the current function (and is thus equivalent to the "saved" the current function (and is thus equivalent to the "saved"
stack pointer. */ stack pointer. */
CORE_ADDR this_sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); CORE_ADDR this_sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
CORE_ADDR fp;
if (hppa_debug) if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (this_sp=0x%s, pc=0x%s, " fprintf_unfiltered (gdb_stdlog, " (this_sp=0x%s, pc=0x%s, "
@ -1733,7 +1734,38 @@ hppa_frame_cache (struct frame_info *next_frame, void **this_cache)
paddr_nz (frame_pc_unwind (next_frame)), paddr_nz (frame_pc_unwind (next_frame)),
paddr_nz (prologue_end)); paddr_nz (prologue_end));
if (frame_pc_unwind (next_frame) >= prologue_end) /* Check to see if a frame pointer is available, and use it for
frame unwinding if it is.
There are some situations where we need to rely on the frame
pointer to do stack unwinding. For example, if a function calls
alloca (), the stack pointer can get adjusted inside the body of
the function. In this case, the ABI requires that the compiler
maintain a frame pointer for the function.
The unwind record has a flag (alloca_frame) that indicates that
a function has a variable frame; unfortunately, gcc/binutils
does not set this flag. Instead, whenever a frame pointer is used
and saved on the stack, the Save_SP flag is set. We use this to
decide whether to use the frame pointer for unwinding.
fp should never be zero here; checking just in case.
TODO: For the HP compiler, maybe we should use the alloca_frame flag
instead of Save_SP. */
fp = frame_unwind_register_unsigned (next_frame, HPPA_FP_REGNUM);
if (frame_pc_unwind (next_frame) >= prologue_end
&& u->Save_SP && fp != 0)
{
cache->base = fp;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (base=0x%s) [frame pointer] }",
paddr_nz (cache->base));
}
else if (frame_pc_unwind (next_frame) >= prologue_end)
{ {
if (u->Save_SP && trad_frame_addr_p (cache->saved_regs, HPPA_SP_REGNUM)) if (u->Save_SP && trad_frame_addr_p (cache->saved_regs, HPPA_SP_REGNUM))
{ {