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| author | Joel Brobecker <brobecker@gnat.com> | 2007-01-05 16:40:48 +0000 |
|---|---|---|
| committer | Joel Brobecker <brobecker@gnat.com> | 2007-01-05 16:40:48 +0000 |
| commit | 92a56b20f12574bc38b7ed0d02c95dae3a905751 (patch) | |
| tree | 720e291384db7a32f5c5e213e04beeac6c77bdd2 /gdb/i386-tdep.c | |
| parent | e4a3b5a47ee980d1da1833628169f5c178c5b98c (diff) | |
| download | gdb-92a56b20f12574bc38b7ed0d02c95dae3a905751.zip gdb-92a56b20f12574bc38b7ed0d02c95dae3a905751.tar.gz gdb-92a56b20f12574bc38b7ed0d02c95dae3a905751.tar.bz2 | |
* i386-tdep.c (i386_analyze_stack_align): Add comment.
Diffstat (limited to 'gdb/i386-tdep.c')
| -rw-r--r-- | gdb/i386-tdep.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c index cd52bf6..de7e226 100644 --- a/gdb/i386-tdep.c +++ b/gdb/i386-tdep.c @@ -497,6 +497,10 @@ static CORE_ADDR i386_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc, 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] = { 0x8d, 0x4c, 0x24, 0x04, /* leal 4(%esp), %ecx */ 0x83, 0xe4, 0xf0, /* andl $-16, %esp */ |