diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-10 21:35:42 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-10-12 13:35:22 -0400 |
| commit | 22e2430d60dbdfcdd732a086e9ef2dbd74c266d1 (patch) | |
| tree | 687067fcaf2761015639178033ee16c8511703b8 /arch/x86/kernel | |
| parent | a74fb73c12398b250fdc5e333a11e15a9e3a84fc (diff) | |
x86, um: convert to saner kernel_execve() semantics
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/entry_32.S | 31 | ||||
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 24 |
2 files changed, 16 insertions, 39 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index fe4cc305d8d..91d295908c3 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -298,12 +298,20 @@ ENTRY(ret_from_fork) CFI_ENDPROC END(ret_from_fork) -ENTRY(ret_from_kernel_execve) - movl %eax, %esp - movl $0,PT_EAX(%esp) +ENTRY(ret_from_kernel_thread) + CFI_STARTPROC + pushl_cfi %eax + call schedule_tail GET_THREAD_INFO(%ebp) + popl_cfi %eax + pushl_cfi $0x0202 # Reset kernel eflags + popfl_cfi + movl PT_EBP(%esp),%eax + call *PT_EBX(%esp) + movl $0,PT_EAX(%esp) jmp syscall_exit -END(ret_from_kernel_execve) + CFI_ENDPROC +ENDPROC(ret_from_kernel_thread) /* * Interrupt exit functions should be protected against kprobes @@ -994,21 +1002,6 @@ END(spurious_interrupt_bug) */ .popsection -ENTRY(ret_from_kernel_thread) - CFI_STARTPROC - pushl_cfi %eax - call schedule_tail - GET_THREAD_INFO(%ebp) - popl_cfi %eax - pushl_cfi $0x0202 # Reset kernel eflags - popfl_cfi - movl PT_EBP(%esp),%eax - call *PT_EBX(%esp) - call do_exit - ud2 # padding for call trace - CFI_ENDPROC -ENDPROC(ret_from_kernel_thread) - #ifdef CONFIG_XEN /* Xen doesn't set %esp to be precisely what the normal sysenter entrypoint expects, so fix it up before using the normal path. */ diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 053c9552ffd..e1f98c22003 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -459,15 +459,13 @@ ENTRY(ret_from_fork) jmp ret_from_sys_call # go to the SYSRET fastpath 1: - subq $REST_SKIP, %rsp # move the stack pointer back + subq $REST_SKIP, %rsp # leave space for volatiles CFI_ADJUST_CFA_OFFSET REST_SKIP movq %rbp, %rdi call *%rbx - # exit - mov %eax, %edi - call do_exit - ud2 # padding for call trace - + movl $0, RAX(%rsp) + RESTORE_REST + jmp int_ret_from_sys_call CFI_ENDPROC END(ret_from_fork) @@ -1214,20 +1212,6 @@ bad_gs: jmp 2b .previous -ENTRY(ret_from_kernel_execve) - movq %rdi, %rsp - movl $0, RAX(%rsp) - // RESTORE_REST - movq 0*8(%rsp), %r15 - movq 1*8(%rsp), %r14 - movq 2*8(%rsp), %r13 - movq 3*8(%rsp), %r12 - movq 4*8(%rsp), %rbp - movq 5*8(%rsp), %rbx - addq $(6*8), %rsp - jmp int_ret_from_sys_call -END(ret_from_kernel_execve) - /* Call softirq on interrupt stack. Interrupts are off. */ ENTRY(call_softirq) CFI_STARTPROC |