diff options
| author | Roland McGrath <roland@redhat.com> | 2008-02-06 22:39:45 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-02-06 22:39:45 +0100 |
| commit | a57dae3aa4d00a000b5bac4238025438204c78b2 (patch) | |
| tree | 03a22973e807fa9607ae7deb60c2939f1b8863d1 /arch | |
| parent | b5556a67f08559b6c1597f6396c1f9ef460f62b4 (diff) | |
x86: fix iret exception recovery on 64-bit
This change broke recovery of exceptions in iret:
commit 72fe4858544292ad64600765cb78bc02298c6b1c
Author: Glauber de Oliveira Costa <gcosta@redhat.com>
x86: replace privileged instructions with paravirt macros
The ENTRY(native_iret) macro adds alignment padding before the iretq
instruction, so "iret_label" no longer points exactly at the instruction.
It was sloppy to leave the old "iret_label" label behind when replacing
its nearby use. Removing it would have revealed the other use of the
label later in the file, and upon noticing that use, anyone exercising
the minimum of attention to detail expected of anyone touching this
subtle code would realize it needed to change as well.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index e518928114d..c7341e81941 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -582,7 +582,6 @@ retint_restore_args: /* return to kernel space */ TRACE_IRQS_IRETQ restore_args: RESTORE_ARGS 0,8,0 -iret_label: #ifdef CONFIG_PARAVIRT INTERRUPT_RETURN #endif @@ -920,7 +919,7 @@ error_kernelspace: iret run with kernel gs again, so don't set the user space flag. B stepping K8s sometimes report an truncated RIP for IRET exceptions returning to compat mode. Check for these here too. */ - leaq iret_label(%rip),%rbp + leaq native_iret(%rip),%rbp cmpq %rbp,RIP(%rsp) je error_swapgs movl %ebp,%ebp /* zero extend */ |