diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2008-12-12 23:34:42 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2008-12-12 23:34:42 +0000 |
| commit | abb77f08cc8f6b0d1c9961704e74a2e52d8d838b (patch) | |
| tree | 6d146b66994a569e8af249dce58f48bae5332fcc /libc/sysdeps/linux/i386/brk.c | |
| parent | 0c2be5a1d1ac59951bfac58ec82897b654ee4d7a (diff) | |
i386/brk.c: gcc can't figure out how to use %ebx in PIC mode,
help it. Code size is the same.
Diffstat (limited to 'libc/sysdeps/linux/i386/brk.c')
| -rw-r--r-- | libc/sysdeps/linux/i386/brk.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/libc/sysdeps/linux/i386/brk.c b/libc/sysdeps/linux/i386/brk.c index 744d1d037..4b47a3b19 100644 --- a/libc/sysdeps/linux/i386/brk.c +++ b/libc/sysdeps/linux/i386/brk.c @@ -25,14 +25,19 @@ void *__curbrk attribute_hidden = 0; /* libc_hidden_proto(brk) */ -int brk (void *addr) +int brk(void *addr) { - void *newbrk, *ebx; - - __asm__ ( - "int $0x80\n" - : "=a" (newbrk), "=b" (ebx) - : "0" (__NR_brk), "1" (addr) + void *newbrk; + + /* %ebx is used in PIC code, need to save/restore it manually. + * gcc won't do it for us if we will request it in constraints + */ + __asm__("pushl %%ebx\n" + "movl %2, %%ebx\n" + "int $0x80\n" + "popl %%ebx\n" + : "=a" (newbrk) + : "0" (__NR_brk), "g" (addr) ); __curbrk = newbrk; |