SYM_CODE_END(__switch_to_asm)
.popsection
-/*
- * The unwinder expects the last frame on the stack to always be at the same
- * offset from the end of the page, which allows it to validate the stack.
- * Calling schedule_tail() directly would break that convention because its an
- * asmlinkage function so its argument has to be pushed on the stack. This
- * wrapper creates a proper "end of stack" frame header before the call.
- */
-.pushsection .text, "ax"
-SYM_FUNC_START(schedule_tail_wrapper)
- FRAME_BEGIN
-
- pushl %eax
- call schedule_tail
- popl %eax
-
- FRAME_END
- RET
-SYM_FUNC_END(schedule_tail_wrapper)
-.popsection
-
/*
* A newly forked process directly context switches into this address.
*
*/
.pushsection .text, "ax"
SYM_CODE_START(ret_from_fork)
- call schedule_tail_wrapper
+ /* return address for the stack unwinder */
+ pushl $.Lsyscall_32_done
+
+ FRAME_BEGIN
+ pushl %eax
+ call schedule_tail
+ addl $4, %esp
+ FRAME_END
testl %ebx, %ebx
jnz 1f /* kernel threads are uncommon */
2:
/* When we fork, we trace the syscall return in the child, too. */
- movl %esp, %eax
+ leal 4(%esp), %eax
call syscall_exit_to_user_mode
- jmp .Lsyscall_32_done
+ RET
/* kernel thread */
1: movl %edi, %eax