1 files changed, 80 insertions, 105 deletions

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 1e96c3628bf2..be846d2468f7 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -36,7 +36,7 @@
  * - FIXUP_TOP_OF_STACK/RESTORE_TOP_OF_STACK - Fix up the hardware stack
  * frame that is otherwise undefined after a SYSCALL
  * - TRACE_IRQ_* - Trace hard interrupt state for lock debugging.
- * - errorentry/paranoidentry/zeroentry - Define exception entry points.
+ * - idtentry - Define exception entry points.
  */
 
 #include <linux/linkage.h>
@@ -1203,125 +1203,100 @@ apicinterrupt IRQ_WORK_VECTOR \
 /*
  * Exception entry points.
  */
-.macro zeroentry sym do_sym
-ENTRY(\sym)
-        INTR_FRAME
-        ASM_CLAC
-        PARAVIRT_ADJUST_EXCEPTION_FRAME
-        pushq_cfi $-1           /* ORIG_RAX: no syscall to restart */
-        subq $ORIG_RAX-R15, %rsp
-        CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
-        call error_entry
-        DEFAULT_FRAME 0
-        movq %rsp,%rdi          /* pt_regs pointer */
-        xorl %esi,%esi          /* no error code */
-        call \do_sym
-        jmp error_exit          /* %ebx: no swapgs flag */
-        CFI_ENDPROC
-END(\sym)
-.endm
+#define INIT_TSS_IST(x) PER_CPU_VAR(init_tss) + (TSS_ist + ((x) - 1) * 8)
 
-.macro paranoidzeroentry sym do_sym
+.macro idtentry sym do_sym has_error_code:req paranoid=0 shift_ist=-1
 ENTRY(\sym)
-        INTR_FRAME
-        ASM_CLAC
-        PARAVIRT_ADJUST_EXCEPTION_FRAME
-        pushq_cfi $-1           /* ORIG_RAX: no syscall to restart */
-        subq $ORIG_RAX-R15, %rsp
-        CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
-        call save_paranoid
-        TRACE_IRQS_OFF
-        movq %rsp,%rdi          /* pt_regs pointer */
-        xorl %esi,%esi          /* no error code */
-        call \do_sym
-        jmp paranoid_exit       /* %ebx: no swapgs flag */
-        CFI_ENDPROC
-END(\sym)
-.endm
+        /* Sanity check */
+        .if \shift_ist != -1 && \paranoid == 0
+        .error "using shift_ist requires paranoid=1"
+        .endif
 
-#define INIT_TSS_IST(x) PER_CPU_VAR(init_tss) + (TSS_ist + ((x) - 1) * 8)
-.macro paranoidzeroentry_ist sym do_sym ist
-ENTRY(\sym)
+        .if \has_error_code
+        XCPT_FRAME
+        .else
         INTR_FRAME
-        ASM_CLAC
-        PARAVIRT_ADJUST_EXCEPTION_FRAME
-        pushq_cfi $-1           /* ORIG_RAX: no syscall to restart */
-        subq $ORIG_RAX-R15, %rsp
-        CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
-        call save_paranoid
-        TRACE_IRQS_OFF_DEBUG
-        movq %rsp,%rdi          /* pt_regs pointer */
-        xorl %esi,%esi          /* no error code */
-        subq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist)
-        call \do_sym
-        addq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist)
-        jmp paranoid_exit       /* %ebx: no swapgs flag */
-        CFI_ENDPROC
-END(\sym)
-.endm
+        .endif
 
-.macro errorentry sym do_sym
-ENTRY(\sym)
-        XCPT_FRAME
         ASM_CLAC
         PARAVIRT_ADJUST_EXCEPTION_FRAME
+
+        .ifeq \has_error_code
+        pushq_cfi $-1                   /* ORIG_RAX: no syscall to restart */
+        .endif
+
         subq $ORIG_RAX-R15, %rsp
         CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
+
+        .if \paranoid
+        call save_paranoid
+        .else
         call error_entry
+        .endif
+
         DEFAULT_FRAME 0
+
+        .if \paranoid
+        .if \shift_ist != -1
+        TRACE_IRQS_OFF_DEBUG            /* reload IDT in case of recursion */
+        .else
+        TRACE_IRQS_OFF
+        .endif
+        .endif
+
         movq %rsp,%rdi                  /* pt_regs pointer */
+
+        .if \has_error_code
         movq ORIG_RAX(%rsp),%rsi        /* get error code */
         movq $-1,ORIG_RAX(%rsp)         /* no syscall to restart */
+        .else
+        xorl %esi,%esi                  /* no error code */
+        .endif
+
+        .if \shift_ist != -1
+        subq $EXCEPTION_STKSZ, INIT_TSS_IST(\shift_ist)
+        .endif
+
         call \do_sym
+
+        .if \shift_ist != -1
+        addq $EXCEPTION_STKSZ, INIT_TSS_IST(\shift_ist)
+        .endif
+
+        .if \paranoid
+        jmp paranoid_exit               /* %ebx: no swapgs flag */
+        .else
         jmp error_exit                  /* %ebx: no swapgs flag */
+        .endif
+
         CFI_ENDPROC
 END(\sym)
 .endm
 
 #ifdef CONFIG_TRACING
-.macro trace_errorentry sym do_sym
-errorentry trace(\sym) trace(\do_sym)
-errorentry \sym \do_sym
+.macro trace_idtentry sym do_sym has_error_code:req
+idtentry trace(\sym) trace(\do_sym) has_error_code=\has_error_code
+idtentry \sym \do_sym has_error_code=\has_error_code
 .endm
 #else
-.macro trace_errorentry sym do_sym
-errorentry \sym \do_sym
+.macro trace_idtentry sym do_sym has_error_code:req
+idtentry \sym \do_sym has_error_code=\has_error_code
 .endm
 #endif
 
-        /* error code is on the stack already */
-.macro paranoiderrorentry sym do_sym
-ENTRY(\sym)
-        XCPT_FRAME
-        ASM_CLAC
-        PARAVIRT_ADJUST_EXCEPTION_FRAME
-        subq $ORIG_RAX-R15, %rsp
-        CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
-        call save_paranoid
-        DEFAULT_FRAME 0
-        TRACE_IRQS_OFF
-        movq %rsp,%rdi                  /* pt_regs pointer */
-        movq ORIG_RAX(%rsp),%rsi        /* get error code */
-        movq $-1,ORIG_RAX(%rsp)         /* no syscall to restart */
-        call \do_sym
-        jmp paranoid_exit               /* %ebx: no swapgs flag */
-        CFI_ENDPROC
-END(\sym)
-.endm
-
-zeroentry divide_error do_divide_error
-zeroentry overflow do_overflow
-zeroentry bounds do_bounds
-zeroentry invalid_op do_invalid_op
-zeroentry device_not_available do_device_not_available
-paranoiderrorentry double_fault do_double_fault
-zeroentry coprocessor_segment_overrun do_coprocessor_segment_overrun
-errorentry invalid_TSS do_invalid_TSS
-errorentry segment_not_present do_segment_not_present
-zeroentry spurious_interrupt_bug do_spurious_interrupt_bug
-zeroentry coprocessor_error do_coprocessor_error
-errorentry alignment_check do_alignment_check
-zeroentry simd_coprocessor_error do_simd_coprocessor_error
+idtentry divide_error do_divide_error has_error_code=0
+idtentry overflow do_overflow has_error_code=0
+idtentry bounds do_bounds has_error_code=0
+idtentry invalid_op do_invalid_op has_error_code=0
+idtentry device_not_available do_device_not_available has_error_code=0
+idtentry double_fault do_double_fault has_error_code=1 paranoid=1
+idtentry coprocessor_segment_overrun do_coprocessor_segment_overrun has_error_code=0
+idtentry invalid_TSS do_invalid_TSS has_error_code=1
+idtentry segment_not_present do_segment_not_present has_error_code=1
+idtentry spurious_interrupt_bug do_spurious_interrupt_bug has_error_code=0
+idtentry coprocessor_error do_coprocessor_error has_error_code=0
+idtentry alignment_check do_alignment_check has_error_code=1
+idtentry simd_coprocessor_error do_simd_coprocessor_error has_error_code=0
 
 
         /* Reload gs selector with exception handling */
@@ -1371,7 +1346,7 @@ ENTRY(do_softirq_own_stack)
 END(do_softirq_own_stack)
 
 #ifdef CONFIG_XEN
-zeroentry xen_hypervisor_callback xen_do_hypervisor_callback
+idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0
 
 /*
  * A note on the "critical region" in our callback handler.
@@ -1482,21 +1457,21 @@ apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \
  */
         .pushsection .kprobes.text, "ax"
 
-paranoidzeroentry_ist debug do_debug DEBUG_STACK
-paranoidzeroentry_ist int3 do_int3 DEBUG_STACK
-paranoiderrorentry stack_segment do_stack_segment
+idtentry debug do_debug has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK
+idtentry int3 do_int3 has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK
+idtentry stack_segment do_stack_segment has_error_code=1 paranoid=1
 #ifdef CONFIG_XEN
-zeroentry xen_debug do_debug
-zeroentry xen_int3 do_int3
-errorentry xen_stack_segment do_stack_segment
+idtentry xen_debug do_debug has_error_code=0
+idtentry xen_int3 do_int3 has_error_code=0
+idtentry xen_stack_segment do_stack_segment has_error_code=1
 #endif
-errorentry general_protection do_general_protection
-trace_errorentry page_fault do_page_fault
+idtentry general_protection do_general_protection has_error_code=1
+trace_idtentry page_fault do_page_fault has_error_code=1
 #ifdef CONFIG_KVM_GUEST
-errorentry async_page_fault do_async_page_fault
+idtentry async_page_fault do_async_page_fault has_error_code=1
 #endif
 #ifdef CONFIG_X86_MCE
-paranoidzeroentry machine_check *machine_check_vector(%rip)
+idtentry machine_check has_error_code=0 paranoid=1 do_sym=*machine_check_vector(%rip)
 #endif
 
         /*