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-rw-r--r--arch/x86/entry/entry_32.S14
-rw-r--r--arch/x86/include/asm/idtentry.h10
-rw-r--r--arch/x86/include/asm/traps.h3
-rw-r--r--arch/x86/kernel/traps.c8
-rw-r--r--arch/x86/xen/xen-asm_32.S2
5 files changed, 21 insertions, 16 deletions
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index c93fb73af039..f7a5f1cda058 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1147,9 +1147,9 @@ restore_all_kernel:
jmp .Lirq_return
.section .fixup, "ax"
-SYM_CODE_START(iret_exc)
+SYM_CODE_START(asm_iret_error)
pushl $0 # no error code
- pushl $do_iret_error
+ pushl $iret_error
#ifdef CONFIG_DEBUG_ENTRY
/*
@@ -1163,10 +1163,10 @@ SYM_CODE_START(iret_exc)
popl %eax
#endif
- jmp common_exception
-SYM_CODE_END(iret_exc)
+ jmp handle_exception
+SYM_CODE_END(asm_iret_error)
.previous
- _ASM_EXTABLE(.Lirq_return, iret_exc)
+ _ASM_EXTABLE(.Lirq_return, asm_iret_error)
SYM_FUNC_END(entry_INT80_32)
.macro FIXUP_ESPFIX_STACK
@@ -1293,7 +1293,7 @@ SYM_FUNC_END(name)
#ifdef CONFIG_PARAVIRT
SYM_CODE_START(native_iret)
iret
- _ASM_EXTABLE(native_iret, iret_exc)
+ _ASM_EXTABLE(native_iret, asm_iret_error)
SYM_CODE_END(native_iret)
#endif
@@ -1358,7 +1358,7 @@ SYM_FUNC_START(xen_failsafe_callback)
popl %eax
lea 16(%esp), %esp
jz 5f
- jmp iret_exc
+ jmp asm_iret_error
5: pushl $-1 /* orig_ax = -1 => not a system call */
SAVE_ALL
ENCODE_FRAME_POINTER
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 99d4759bd914..ee6ebfef7e57 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -57,6 +57,10 @@ __visible noinstr void func(struct pt_regs *regs) \
\
static __always_inline void __##func(struct pt_regs *regs)
+/* Special case for 32bit IRET 'trap' */
+#define DECLARE_IDTENTRY_SW DECLARE_IDTENTRY
+#define DEFINE_IDTENTRY_SW DEFINE_IDTENTRY
+
/**
* DECLARE_IDTENTRY_ERRORCODE - Declare functions for simple IDT entry points
* Error code pushed by hardware
@@ -111,6 +115,9 @@ static __always_inline void __##func(struct pt_regs *regs, \
#define DECLARE_IDTENTRY_ERRORCODE(vector, func) \
idtentry vector asm_##func func has_error_code=1 sane=1
+/* Special case for 32bit IRET 'trap'. Do not emit ASM code */
+#define DECLARE_IDTENTRY_SW(vector, func)
+
#endif /* __ASSEMBLY__ */
/*
@@ -133,6 +140,9 @@ DECLARE_IDTENTRY(X86_TRAP_SPURIOUS, exc_spurious_interrupt_bug);
DECLARE_IDTENTRY(X86_TRAP_MF, exc_coprocessor_error);
DECLARE_IDTENTRY(X86_TRAP_XF, exc_simd_coprocessor_error);
+/* 32bit software IRET trap. Do not emit ASM code */
+DECLARE_IDTENTRY_SW(X86_TRAP_IRET, iret_error);
+
/* Simple exception entries with error code pushed by hardware */
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_TS, exc_invalid_tss);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_NP, exc_segment_not_present);
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index e7eb7532233d..5774d0b6cf77 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -39,9 +39,6 @@ dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
dotraplinkage void do_int3(struct pt_regs *regs, long error_code);
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);
-#ifdef CONFIG_X86_32
-dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code);
-#endif
dotraplinkage void do_mce(struct pt_regs *regs, long error_code);
#ifdef CONFIG_X86_64
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 1702922ebd9c..b28a64d7691f 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -925,14 +925,12 @@ DEFINE_IDTENTRY(exc_device_not_available)
}
#ifdef CONFIG_X86_32
-dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
+DEFINE_IDTENTRY_SW(iret_error)
{
- RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
local_irq_enable();
-
- if (notify_die(DIE_TRAP, "iret exception", regs, error_code,
+ if (notify_die(DIE_TRAP, "iret exception", regs, 0,
X86_TRAP_IRET, SIGILL) != NOTIFY_STOP) {
- do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code,
+ do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, 0,
ILL_BADSTK, (void __user *)NULL);
}
local_irq_disable();
diff --git a/arch/x86/xen/xen-asm_32.S b/arch/x86/xen/xen-asm_32.S
index 2712e9155306..812ff01e4e34 100644
--- a/arch/x86/xen/xen-asm_32.S
+++ b/arch/x86/xen/xen-asm_32.S
@@ -117,7 +117,7 @@ iret_restore_end:
1: iret
xen_iret_end_crit:
- _ASM_EXTABLE(1b, iret_exc)
+ _ASM_EXTABLE(1b, asm_iret_error)
hyper_iret:
/* put this out of line since its very rarely used */