diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/entry/entry_32.S | 33 |
1 files changed, 10 insertions, 23 deletions
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 91397f58ac30..e56123f03a79 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -720,26 +720,6 @@ 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. * * eax: prev task we switched from @@ -748,16 +728,23 @@ SYM_FUNC_END(schedule_tail_wrapper) */ .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 |