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Diffstat (limited to 'libc/sysdeps/linux/i386/clone.S')
-rw-r--r--libc/sysdeps/linux/i386/clone.S37
1 files changed, 24 insertions, 13 deletions
diff --git a/libc/sysdeps/linux/i386/clone.S b/libc/sysdeps/linux/i386/clone.S
index d18d4edc2..d918fc444 100644
--- a/libc/sysdeps/linux/i386/clone.S
+++ b/libc/sysdeps/linux/i386/clone.S
@@ -24,6 +24,7 @@
*/
#define _ERRNO_H 1
+#include <features.h>
#include <bits/errno.h>
#include <sys/syscall.h>
@@ -39,31 +40,42 @@
#define CTID TLS+PTR_SIZE
- .text
- .globl __clone;
- .type __clone,@function;
- .align 1<<4;
+.text
+.type clone,@function;
+.weak clone ; clone = __clone
+
+.type __clone,@function;
+.globl __clone;
__clone:
/* Sanity check arguments. */
movl $-EINVAL,%eax
+
+ test %ecx,%ecx
+ call .Lclone_error
+
+ test %edx,%edx
+ call .Lclone_error
+
movl FUNC(%esp),%ecx /* no NULL function pointers */
#ifdef __PIC__
- jecxz __syscall_error
+ jecxz .Lclone_error
#else
testl %ecx,%ecx
- jz __syscall_error
+ jz .Lclone_error
#endif
movl STACK(%esp),%ecx /* no NULL stack pointers */
#ifdef __PIC__
- jecxz __syscall_error
+ jecxz .Lclone_error
#else
testl %ecx,%ecx
- jz __syscall_error
+ jz .Lclone_error
#endif
- /* Insert the argument onto the new stack. */
- subl $16,%ecx
+ /* Insert the argument onto the new stack. Make sure the new
+ thread is started with an alignment of (mod 16). */
+ andl $0xfffffff0, %ecx
+ subl $24,%ecx
movl ARG(%esp),%eax /* no negative argument counts */
movl %eax,12(%ecx)
@@ -90,7 +102,7 @@ __clone:
popl %ebx
test %eax,%eax
- jl __syscall_error
+ jl .Lclone_error
jz .Lthread_start
.Lpseudo_end:
@@ -109,7 +121,7 @@ __clone:
movl $__NR_exit, %eax
int $0x80
-__syscall_error:
+.Lclone_error:
negl %eax
pushl %eax
#ifdef __PIC__
@@ -129,4 +141,3 @@ __syscall_error:
.Lsize:
.size __clone,.Lsize-__clone
-.weak clone ; clone = __clone