x86/entry: Convert Segment not present exception to IDTENTRY

Convert #NP 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 prototypes

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134905.443591450@linutronix.de

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 2143a62..b01dbb3 100644 (file)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1318,12 +1318,6 @@ SYM_CODE_START(native_iret)
 SYM_CODE_END(native_iret)
 #endif
 
-SYM_CODE_START(segment_not_present)
-       ASM_CLAC
-       pushl   $do_segment_not_present
-       jmp     common_exception
-SYM_CODE_END(segment_not_present)
-
 SYM_CODE_START(stack_segment)
        ASM_CLAC
        pushl   $do_stack_segment

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 07307cf..367a207 100644 (file)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1073,7 +1073,6 @@ apicinterrupt IRQ_WORK_VECTOR                     irq_work_interrupt              smp_irq_work_interrupt
  */
 
 idtentry       X86_TRAP_BP             int3                    do_int3                         has_error_code=0
-idtentry       X86_TRAP_NP             segment_not_present     do_segment_not_present          has_error_code=1
 idtentry       X86_TRAP_SS             stack_segment           do_stack_segment                has_error_code=1
 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

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index aa0d465..d517c09 100644 (file)
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -132,5 +132,6 @@ DECLARE_IDTENTRY(X86_TRAP_OLD_MF,   exc_coproc_segment_overrun);
 
 /* 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);
 
 #endif

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 30bc589..970c888 100644 (file)
--- 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 segment_not_present(void);
 asmlinkage void stack_segment(void);
 asmlinkage void general_protection(void);
 asmlinkage void page_fault(void);
@@ -35,7 +34,6 @@ asmlinkage void xen_xennmi(void);
 asmlinkage void xen_xendebug(void);
 asmlinkage void xen_int3(void);
 asmlinkage void xen_double_fault(void);
-asmlinkage void xen_segment_not_present(void);
 asmlinkage void xen_stack_segment(void);
 asmlinkage void xen_general_protection(void);
 asmlinkage void xen_page_fault(void);
@@ -52,7 +50,6 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
 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_segment_not_present(struct pt_regs *regs, long error_code);
 dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code);
 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);

diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index caa740d..b9acc7f 100644 (file)
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -80,7 +80,7 @@ static const __initconst struct idt_data def_idts[] = {
        INTG(X86_TRAP_NM,               asm_exc_device_not_available),
        INTG(X86_TRAP_OLD_MF,           asm_exc_coproc_segment_overrun),
        INTG(X86_TRAP_TS,               asm_exc_invalid_tss),
-       INTG(X86_TRAP_NP,               segment_not_present),
+       INTG(X86_TRAP_NP,               asm_exc_segment_not_present),
        INTG(X86_TRAP_SS,               stack_segment),
        INTG(X86_TRAP_GP,               general_protection),
        INTG(X86_TRAP_SPURIOUS,         spurious_interrupt_bug),

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 10ab083..88ba5f0 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -258,6 +258,12 @@ DEFINE_IDTENTRY_ERRORCODE(exc_invalid_tss)
                      0, NULL);
 }
 
+DEFINE_IDTENTRY_ERRORCODE(exc_segment_not_present)
+{
+       do_error_trap(regs, error_code, "segment not present", X86_TRAP_NP,
+                     SIGBUS, 0, NULL);
+}
+
 #define IP ((void __user *)uprobe_get_trap_addr(regs))
 #define DO_ERROR(trapnr, signr, sicode, addr, str, name)                  \
 dotraplinkage void do_##name(struct pt_regs *regs, long error_code)       \
@@ -265,7 +271,6 @@ dotraplinkage void do_##name(struct pt_regs *regs, long error_code)    \
        do_error_trap(regs, error_code, str, trapnr, signr, sicode, addr); \
 }
 
-DO_ERROR(X86_TRAP_NP,     SIGBUS,           0, NULL, "segment not present", segment_not_present)
 DO_ERROR(X86_TRAP_SS,     SIGBUS,           0, NULL, "stack segment",       stack_segment)
 #undef IP
 

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 650ce23..4e2a41e 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -628,7 +628,7 @@ static struct trap_array_entry trap_array[] = {
        TRAP_ENTRY(exc_device_not_available,            false ),
        TRAP_ENTRY(exc_coproc_segment_overrun,          false ),
        TRAP_ENTRY(exc_invalid_tss,                     false ),
-       { segment_not_present,         xen_segment_not_present,         false },
+       TRAP_ENTRY(exc_segment_not_present,             false ),
        { stack_segment,               xen_stack_segment,               false },
        { general_protection,          xen_general_protection,          false },
        { spurious_interrupt_bug,      xen_spurious_interrupt_bug,      false },

diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index f7a890c..c8ce7ad 100644 (file)
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -40,7 +40,7 @@ xen_pv_trap asm_exc_device_not_available
 xen_pv_trap double_fault
 xen_pv_trap asm_exc_coproc_segment_overrun
 xen_pv_trap asm_exc_invalid_tss
-xen_pv_trap segment_not_present
+xen_pv_trap asm_exc_segment_not_present
 xen_pv_trap stack_segment
 xen_pv_trap general_protection
 xen_pv_trap page_fault