diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2008-12-12 14:23:17 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2008-12-12 14:23:17 +0000 |
| commit | 6602ba129f062e26a875d8f3b947504500dcc261 (patch) | |
| tree | 2e359d08a98c8f7f16d2fde9f5a46ed10b2673b5 /libc/sysdeps/linux/i386/brk.c | |
| parent | 0f0f20abd295592740a1e764abb976e0db337d86 (diff) | |
smaller brk() for i386. Inspected assembly to see it's still valid.
text data bss dec hex filename
- 44 0 4 48 30 libc/sysdeps/linux/i386/brk.o
+ 42 0 4 46 2e libc/sysdeps/linux/i386/brk.o
Diffstat (limited to 'libc/sysdeps/linux/i386/brk.c')
| -rw-r--r-- | libc/sysdeps/linux/i386/brk.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/libc/sysdeps/linux/i386/brk.c b/libc/sysdeps/linux/i386/brk.c index 2be9c1802..744d1d037 100644 --- a/libc/sysdeps/linux/i386/brk.c +++ b/libc/sysdeps/linux/i386/brk.c @@ -27,23 +27,21 @@ void *__curbrk attribute_hidden = 0; /* libc_hidden_proto(brk) */ int brk (void *addr) { - void *__unbounded newbrk, *__unbounded scratch; + void *newbrk, *ebx; - __asm__ ("movl %%ebx, %1\n" /* Save %ebx in scratch register. */ - "movl %3, %%ebx\n" /* Put ADDR in %ebx to be syscall arg. */ - "int $0x80 # %2\n" /* Perform the system call. */ - "movl %1, %%ebx\n" /* Restore %ebx from scratch register. */ - : "=a" (newbrk), "=r" (scratch) - : "0" (__NR_brk), "g" (__ptrvalue (addr))); + __asm__ ( + "int $0x80\n" + : "=a" (newbrk), "=b" (ebx) + : "0" (__NR_brk), "1" (addr) + ); - __curbrk = newbrk; + __curbrk = newbrk; - if (newbrk < addr) - { - __set_errno (ENOMEM); - return -1; - } + if (newbrk < addr) { + __set_errno(ENOMEM); + return -1; + } - return 0; + return 0; } libc_hidden_def(brk) |