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2003-03-07 Michal Ludvig <mludvig@suse.cz>

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* x86-64-tdep.c (x86_64_function_has_prologue): New function.
	(x86_64_skip_prologue): Move prologue detection to
	separate function.
	* x86-64-tdep.h (x86_64_function_has_prologue): New prototype.
This commit is contained in:
Michal Ludvig 2003-03-07 10:43:00 +00:00
parent 87d243f1ce
commit 6d686a84d6
3 changed files with 34 additions and 15 deletions
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7
gdb/ChangeLog
View file

@ -1,3 +1,10 @@
2003-03-07 Michal Ludvig <mludvig@suse.cz>
* x86-64-tdep.c (x86_64_function_has_prologue): New function.
(x86_64_skip_prologue): Move prologue detection to
separate function.
* x86-64-tdep.h (x86_64_function_has_prologue): New prototype.
2003-03-05 Andrew Cagney <cagney@redhat.com>
* d10v-tdep.c (d10v_unwind_dummy_id): New function.

41
gdb/x86-64-tdep.c
View file

@ -851,11 +851,34 @@ x86_64_frameless_function_invocation (struct frame_info *frame)
return 0;
}
/* We will handle only functions beginning with:
55 pushq %rbp
48 89 e5 movq %rsp,%rbp
Any function that doesn't start with this sequence
will be assumed to have no prologue and thus no valid
frame pointer in %rbp. */
#define PROLOG_BUFSIZE 4
int
x86_64_function_has_prologue (CORE_ADDR pc)
{
int i;
unsigned char prolog_expect[PROLOG_BUFSIZE] = { 0x55, 0x48, 0x89, 0xe5 },
prolog_buf[PROLOG_BUFSIZE];
read_memory (pc, (char *) prolog_buf, PROLOG_BUFSIZE);
/* First check, whether pc points to pushq %rbp, movq %rsp,%rbp. */
for (i = 0; i < PROLOG_BUFSIZE; i++)
if (prolog_expect[i] != prolog_buf[i])
return 0; /* ... no, it doesn't. Nothing to skip. */
return 1;
}
/* If a function with debugging information and known beginning
is detected, we will return pc of the next line in the source
code. With this approach we effectively skip the prolog. */
#define PROLOG_BUFSIZE 4
CORE_ADDR
x86_64_skip_prologue (CORE_ADDR pc)
{
@ -863,21 +886,9 @@ x86_64_skip_prologue (CORE_ADDR pc)
struct symtab_and_line v_sal;
struct symbol *v_function;
CORE_ADDR endaddr;
unsigned char prolog_buf[PROLOG_BUFSIZE];
/* We will handle only functions starting with: */
static unsigned char prolog_expect[PROLOG_BUFSIZE] =
{
0x55, /* pushq %rbp */
0x48, 0x89, 0xe5 /* movq %rsp, %rbp */
};
read_memory (pc, (char *) prolog_buf, PROLOG_BUFSIZE);
/* First check, whether pc points to pushq %rbp, movq %rsp, %rbp. */
for (i = 0; i < PROLOG_BUFSIZE; i++)
if (prolog_expect[i] != prolog_buf[i])
return pc; /* ... no, it doesn't. Nothing to skip. */
if (! x86_64_function_has_prologue (pc))
return pc;
/* OK, we have found the prologue and want PC of the first
non-prologue instruction. */

1
gdb/x86-64-tdep.h
View file

@ -36,6 +36,7 @@ gdbarch_saved_pc_after_call_ftype x86_64_linux_saved_pc_after_call;
gdbarch_pc_in_sigtramp_ftype x86_64_linux_in_sigtramp;
CORE_ADDR x86_64_linux_frame_chain (struct frame_info *fi);
CORE_ADDR x86_64_init_frame_pc (int fromleaf, struct frame_info *fi);
int x86_64_function_has_prologue (CORE_ADDR pc);
void x86_64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch);