diff options
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 563b5574dbca..7a4457e91e8e 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -904,8 +904,10 @@ irq_return: * Are we returning to a stack segment from the LDT? Note: in * 64-bit mode SS:RSP on the exception stack is always valid. */ +#ifdef CONFIG_X86_ESPFIX64 testb $4,(SS-RIP)(%rsp) jnz irq_return_ldt +#endif irq_return_iret: INTERRUPT_RETURN @@ -923,6 +925,7 @@ ENTRY(native_iret) .previous #endif +#ifdef CONFIG_X86_ESPFIX64 irq_return_ldt: pushq_cfi %rax pushq_cfi %rdi @@ -946,6 +949,7 @@ irq_return_ldt: movq %rax,%rsp popq_cfi %rax jmp irq_return_iret +#endif .section .fixup,"ax" bad_iret: @@ -1019,6 +1023,7 @@ END(common_interrupt) * modify the stack to make it look like we just entered * the #GP handler from user space, similar to bad_iret. */ +#ifdef CONFIG_X86_ESPFIX64 ALIGN __do_double_fault: XCPT_FRAME 1 RDI+8 @@ -1044,6 +1049,9 @@ __do_double_fault: retq CFI_ENDPROC END(__do_double_fault) +#else +# define __do_double_fault do_double_fault +#endif /* * End of kprobes section |