diff options
| author | Konstantin Belousov <kib@FreeBSD.org> | 2008-10-13 12:45:18 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2008-10-13 12:45:18 +0000 |
| commit | 0b67cc80ccea1d370f023766b88f6e8cc9ae468e (patch) | |
| tree | df402dac07468310d4ea60a246a580480bdbb2c3 | |
| parent | c4d6075d308deac07a78143eb9d9269ce3dadae4 (diff) | |
Notes
| -rw-r--r-- | sys/i386/include/profile.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/i386/include/profile.h b/sys/i386/include/profile.h index fe036d8a0751..fb3320b6465d 100644 --- a/sys/i386/include/profile.h +++ b/sys/i386/include/profile.h @@ -115,7 +115,15 @@ void user(void); void \ mcount() \ { \ - uintfptr_t selfpc, frompc; \ + uintfptr_t selfpc, frompc, ecx; \ + /* \ + * In gcc 4.2, ecx might be used in the caller as the arg \ + * pointer if the stack realignment option is set (-mstackrealign) \ + * or if the caller has the force_align_arg_pointer attribute \ + * (stack realignment is ALWAYS on for main). Preserve ecx \ + * here. \ + */ \ + __asm("" : "=c" (ecx)); \ /* \ * Find the return address for mcount, \ * and the return address for mcount's caller. \ @@ -132,6 +140,7 @@ mcount() \ __asm("movl (%%ebp),%0" : "=r" (frompc)); \ frompc = ((uintfptr_t *)frompc)[1]; \ _mcount(frompc, selfpc); \ + __asm("" : : "c" (ecx)); \ } #else /* !__GNUCLIKE_ASM */ #define MCOUNT |