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* i386-tdep.c (i386_analyze_stack_align): Add comment.

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Joel Brobecker 2007-01-05 16:40:48 +00:00
parent e4a3b5a47e
commit 92a56b20f1
2 changed files with 8 additions and 0 deletions
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gdb/ChangeLog
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@ -1,3 +1,7 @@
2007-01-05 Joel Brobecker <brobecker@adacore.com>
* i386-tdep.c (i386_analyze_stack_align): Add comment.
2007-01-05 Joel Brobecker <brobecker@adacore.com> 2007-01-05 Joel Brobecker <brobecker@adacore.com>
* NEWS: Add entries for new catch commands. * NEWS: Add entries for new catch commands.

4
gdb/i386-tdep.c
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@ -497,6 +497,10 @@ static CORE_ADDR
i386_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc, i386_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc,
struct i386_frame_cache *cache) struct i386_frame_cache *cache)
{ {
/* The register used by the compiler to perform the stack re-alignment
is, in order of preference, either %ecx, %edx, or %eax. GCC should
never use %ebx as it always treats it as callee-saved, whereas
the compiler can only use caller-saved registers. */
static const gdb_byte insns_ecx[10] = { static const gdb_byte insns_ecx[10] = {
0x8d, 0x4c, 0x24, 0x04, /* leal 4(%esp), %ecx */ 0x8d, 0x4c, 0x24, 0x04, /* leal 4(%esp), %ecx */
0x83, 0xe4, 0xf0, /* andl $-16, %esp */ 0x83, 0xe4, 0xf0, /* andl $-16, %esp */