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* mn10300-tdep.c (mn10300_push_dummy_call): Adjust stack pointer

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to account for call site optimizations.
This commit is contained in:
Kevin Buettner 2008-02-05 16:20:20 +00:00
parent d844e34bca
commit ee3a2f014e
2 changed files with 33 additions and 0 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2008-02-05 Kevin Buettner <kevinb@redhat.com>
* mn10300-tdep.c (mn10300_push_dummy_call): Adjust stack pointer
to account for call site optimizations.
2008-02-05 Andrzej Zaborowski <balrogg@gmail.com>
* tracepoint.c (read_actions): Handle end-of-text indicator

28
gdb/mn10300-tdep.c
View file

@ -35,6 +35,7 @@
#include "symtab.h"
#include "dwarf2-frame.h"
#include "osabi.h"
#include "infcall.h"
#include "mn10300-tdep.h"
@ -1079,6 +1080,33 @@ mn10300_push_dummy_call (struct gdbarch *gdbarch,
/* Update $sp. */
regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
/* On the mn10300, it's possible to move some of the stack adjustment
and saving of the caller-save registers out of the prologue and
into the call sites. (When using gcc, this optimization can
occur when using the -mrelax switch.) If this occurs, the dwarf2
info will reflect this fact. We can test to see if this is the
case by creating a new frame using the current stack pointer and
the address of the function that we're about to call. We then
unwind SP and see if it's different than the SP of our newly
created frame. If the SP values are the same, the caller is not
expected to allocate any additional stack. On the other hand, if
the SP values are different, the difference determines the
additional stack that must be allocated.
Note that we don't update the return value though because that's
the value of the stack just after pushing the arguments, but prior
to performing the call. This value is needed in order to
construct the frame ID of the dummy call. */
{
CORE_ADDR func_addr = find_function_addr (target_func, NULL);
CORE_ADDR unwound_sp
= mn10300_unwind_sp (gdbarch, create_new_frame (sp, func_addr));
if (sp != unwound_sp)
regcache_cooked_write_unsigned (regcache, E_SP_REGNUM,
sp - (unwound_sp - sp));
}
return sp;
}