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-rw-r--r--libc/sysdeps/linux/i386/vfork.S90
1 files changed, 46 insertions, 44 deletions
diff --git a/libc/sysdeps/linux/i386/vfork.S b/libc/sysdeps/linux/i386/vfork.S
index e2d87053b..c7002f189 100644
--- a/libc/sysdeps/linux/i386/vfork.S
+++ b/libc/sysdeps/linux/i386/vfork.S
@@ -2,60 +2,62 @@
* June 27, 2001 Manuel Novoa III
*
* Modified to (hopefully) be PIC and REENTRANT safe.
+ * Modified again to better follow the glibc implementation.
*
*/
+
+#define _ERRNO_H 1
+#include <bits/errno.h>
+#include <sys/syscall.h>
+
+ .text
+ .globl __vfork;
+ .type __vfork,@function;
+ .align 1<<4;
-.text
- .align 4
-.globl vfork
- .type vfork,@function
-vfork:
+__vfork:
+#ifdef __NR_vfork
popl %ecx
- movl $190,%eax
-#ifdef __PIC__
- pushl %ebx
-#endif
-#APP
+ movl $__NR_vfork,%eax
int $0x80
-#NO_APP
-#ifdef __PIC__
- popl %ebx
-#endif
+ pushl %ecx
cmpl $-4095,%eax
jae .Lerror
- jmp *%ecx
- .p2align 4,,7
+ ret
+
.Lerror:
- pushl %ecx
+ cmpl $-ENOSYS,%eax
+ jne __syscall_error
+#endif
+ /* Fall back on calling fork */
+ movl $__NR_fork,%eax
+ int $0x80
+ cmpl $-4095,%eax
+ jae __syscall_error
+ ret
+
+__syscall_error:
+ negl %eax
+ pushl %eax
#ifdef __PIC__
- pushl %ebx
- call .Lhere
-.Lhere:
- popl %ebx
- addl $_GLOBAL_OFFSET_TABLE_+[.-.Lhere],%ebx
- negl %eax
- movl %eax,%ecx
-#ifdef __UCLIBC_HAS_THREADS__
- call __errno_location@PLT
-#else
- movl errno@GOT(%ebx),%eax
-#endif /* __UCLIBC_HAS_THREADS__ */
- movl %ecx,(%eax)
- popl %ebx
+ call .Lthere
+.Lthere:
+ popl %ebx
+ addl $_GLOBAL_OFFSET_TABLE_+[.- .Lthere ], %ebx
+ call __errno_location@PLT
#else
- negl %eax
-#ifdef __UCLIBC_HAS_THREADS__
- movl %eax,%ecx
- call __errno_location
- movl %ecx,(%eax)
-#else
- movl %eax,errno
-#endif /* __UCLIBC_HAS_THREADS__ */
+ call __errno_location
+#endif
+ popl %ecx
+ movl %ecx, (%eax)
+ xorl %eax, %eax
+ decl %eax
-#endif /* __PIC__ */
-
- movl $-1,%eax
- ret
.Lsize:
- .size vfork,.Lsize-vfork
+ .size __vfork,.Lsize-__vfork
+
+
+.weak vfork ; vfork = __vfork
+
+