From: Thomas Gleixner <t...@linutronix.de>
Convert #GP to IDTENTRY_ERRORCODE:
- Implement the C entry point with DEFINE_IDTENTRY
- Emit the ASM stub with DECLARE_IDTENTRY
- Remove the ASM idtentry in 64bit
- Remove the open coded ASM entry code in 32bit
- Fixup the XEN/PV code
- Remove the old prototyoes
- Remove the RCU warning as the new entry macro ensures correctness
No functional change.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
V3: Fixup simd on 32bit to exc_general_protection
---
arch/x86/entry/entry_32.S | 8 +-------
arch/x86/entry/entry_64.S | 3 +--
arch/x86/include/asm/idtentry.h | 1 +
arch/x86/include/asm/traps.h | 3 ---
arch/x86/kernel/idt.c | 2 +-
arch/x86/kernel/traps.c | 8 +++-----
arch/x86/xen/enlighten_pv.c | 2 +-
arch/x86/xen/xen-asm_64.S | 2 +-
8 files changed, 9 insertions(+), 20 deletions(-)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1302,7 +1302,7 @@ SYM_CODE_START(simd_coprocessor_error)
pushl $0
#ifdef CONFIG_X86_INVD_BUG
/* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */
- ALTERNATIVE "pushl $do_general_protection", \
+ ALTERNATIVE "pushl $exc_general_protection", \
"pushl $do_simd_coprocessor_error", \
X86_FEATURE_XMM
#else
@@ -1692,12 +1692,6 @@ SYM_CODE_START(int3)
jmp common_exception
SYM_CODE_END(int3)
-SYM_CODE_START(general_protection)
- ASM_CLAC
- pushl $do_general_protection
- jmp common_exception
-SYM_CODE_END(general_protection)
-
.pushsection .text, "ax"
SYM_CODE_START(rewind_stack_do_exit)
/* Prevent any naive code from trying to unwind to our caller. */
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1074,7 +1074,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work
*/
idtentry X86_TRAP_BP int3 do_int3
has_error_code=0
-idtentry X86_TRAP_GP general_protection
do_general_protection has_error_code=1
idtentry X86_TRAP_SPURIOUS spurious_interrupt_bug
do_spurious_interrupt_bug has_error_code=0
idtentry X86_TRAP_MF coprocessor_error
do_coprocessor_error has_error_code=0
idtentry X86_TRAP_AC alignment_check
do_alignment_check has_error_code=1
@@ -1210,7 +1209,7 @@ SYM_CODE_START(xen_failsafe_callback)
addq $0x30, %rsp
pushq $0 /* RIP */
UNWIND_HINT_IRET_REGS offset=8
- jmp general_protection
+ jmp asm_exc_general_protection
1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */
movq (%rsp), %rcx
movq 8(%rsp), %r11
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -134,5 +134,6 @@ DECLARE_IDTENTRY(X86_TRAP_OLD_MF, exc_co
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_TS, exc_invalid_tss);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_NP, exc_segment_not_present);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_SS, exc_stack_segment);
+DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_GP, exc_general_protection);
#endif
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -17,7 +17,6 @@ asmlinkage void int3(void);
#ifdef CONFIG_X86_64
asmlinkage void double_fault(void);
#endif
-asmlinkage void general_protection(void);
asmlinkage void page_fault(void);
asmlinkage void async_page_fault(void);
asmlinkage void spurious_interrupt_bug(void);
@@ -33,7 +32,6 @@ asmlinkage void xen_xennmi(void);
asmlinkage void xen_xendebug(void);
asmlinkage void xen_int3(void);
asmlinkage void xen_double_fault(void);
-asmlinkage void xen_general_protection(void);
asmlinkage void xen_page_fault(void);
asmlinkage void xen_spurious_interrupt_bug(void);
asmlinkage void xen_coprocessor_error(void);
@@ -50,7 +48,6 @@ dotraplinkage void do_int3(struct pt_reg
#if defined(CONFIG_X86_64) || defined(CONFIG_DOUBLEFAULT)
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code,
unsigned long cr2);
#endif
-dotraplinkage void do_general_protection(struct pt_regs *regs, long
error_code);
dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long
error_code, unsigned long address);
dotraplinkage void do_spurious_interrupt_bug(struct pt_regs *regs, long
error_code);
dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code);
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -79,7 +79,7 @@ static const __initconst struct idt_data
INTG(X86_TRAP_TS, asm_exc_invalid_tss),
INTG(X86_TRAP_NP, asm_exc_segment_not_present),
INTG(X86_TRAP_SS, asm_exc_stack_segment),
- INTG(X86_TRAP_GP, general_protection),
+ INTG(X86_TRAP_GP, asm_exc_general_protection),
INTG(X86_TRAP_SPURIOUS, spurious_interrupt_bug),
INTG(X86_TRAP_MF, coprocessor_error),
INTG(X86_TRAP_AC, alignment_check),
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -145,7 +145,7 @@ do_trap_no_signal(struct task_struct *ts
* process no chance to handle the signal and notice the
* kernel fault information, so that won't result in polluting
* the information about previously queued, but not yet
- * delivered, faults. See also do_general_protection below.
+ * delivered, faults. See also exc_general_protection below.
*/
tsk->thread.error_code = error_code;
tsk->thread.trap_nr = trapnr;
@@ -366,7 +366,7 @@ dotraplinkage void do_double_fault(struc
* which is what the stub expects, given that the faulting
* RIP will be the IRET instruction.
*/
- regs->ip = (unsigned long)general_protection;
+ regs->ip = (unsigned long)asm_exc_general_protection;
regs->sp = (unsigned long)&gpregs->orig_ax;
return;
@@ -486,7 +486,7 @@ static enum kernel_gp_hint get_kernel_gp
#define GPFSTR "general protection fault"
-dotraplinkage void do_general_protection(struct pt_regs *regs, long error_code)
+DEFINE_IDTENTRY_ERRORCODE(exc_general_protection)
{
char desc[sizeof(GPFSTR) + 50 + 2*sizeof(unsigned long) + 1] = GPFSTR;
enum kernel_gp_hint hint = GP_NO_HINT;
@@ -494,7 +494,6 @@ dotraplinkage void do_general_protection
unsigned long gp_addr;
int ret;
- RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
cond_local_irq_enable(regs);
if (static_cpu_has(X86_FEATURE_UMIP)) {
@@ -562,7 +561,6 @@ dotraplinkage void do_general_protection
exit:
cond_local_irq_disable(regs);
}
-NOKPROBE_SYMBOL(do_general_protection);
dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code)
{
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -631,7 +631,7 @@ static struct trap_array_entry trap_arra
TRAP_ENTRY(exc_invalid_tss, false ),
TRAP_ENTRY(exc_segment_not_present, false ),
TRAP_ENTRY(exc_stack_segment, false ),
- { general_protection, xen_general_protection, false },
+ TRAP_ENTRY(exc_general_protection, false ),
{ spurious_interrupt_bug, xen_spurious_interrupt_bug, false },
{ coprocessor_error, xen_coprocessor_error, false },
{ alignment_check, xen_alignment_check, false },
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -42,7 +42,7 @@ xen_pv_trap asm_exc_coproc_segment_overr
xen_pv_trap asm_exc_invalid_tss
xen_pv_trap asm_exc_segment_not_present
xen_pv_trap asm_exc_stack_segment
-xen_pv_trap general_protection
+xen_pv_trap asm_exc_general_protection
xen_pv_trap page_fault
xen_pv_trap spurious_interrupt_bug
xen_pv_trap coprocessor_error
