x86/entry: Convert Stack segment exception to IDTENTRY

Convert #SS 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: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505134905.539867572@linutronix.de

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index b01dbb3..ffe43d2 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(stack_segment)
-       ASM_CLAC
-       pushl   $do_stack_segment
-       jmp     common_exception
-SYM_CODE_END(stack_segment)
-
 SYM_CODE_START(alignment_check)
        ASM_CLAC
        pushl   $do_alignment_check

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 367a207..c92592d 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_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
 idtentry       X86_TRAP_MF             coprocessor_error       do_coprocessor_error            has_error_code=0

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index d517c09..4c0abd3 100644 (file)
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -133,5 +133,6 @@ 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);
+DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_SS,        exc_stack_segment);
 
 #endif

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 970c888..5e580ff 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 stack_segment(void);
 asmlinkage void general_protection(void);
 asmlinkage void page_fault(void);
 asmlinkage void async_page_fault(void);
@@ -34,7 +33,6 @@ asmlinkage void xen_xennmi(void);
 asmlinkage void xen_xendebug(void);
 asmlinkage void xen_int3(void);
 asmlinkage void xen_double_fault(void);
-asmlinkage void xen_stack_segment(void);
 asmlinkage void xen_general_protection(void);
 asmlinkage void xen_page_fault(void);
 asmlinkage void xen_spurious_interrupt_bug(void);
@@ -50,7 +48,6 @@ 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_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);
 dotraplinkage void do_spurious_interrupt_bug(struct pt_regs *regs, long error_code);

diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index b9acc7f..8d95cbf 100644 (file)
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -81,7 +81,7 @@ static const __initconst struct idt_data def_idts[] = {
        INTG(X86_TRAP_OLD_MF,           asm_exc_coproc_segment_overrun),
        INTG(X86_TRAP_TS,               asm_exc_invalid_tss),
        INTG(X86_TRAP_NP,               asm_exc_segment_not_present),
-       INTG(X86_TRAP_SS,               stack_segment),
+       INTG(X86_TRAP_SS,               asm_exc_stack_segment),
        INTG(X86_TRAP_GP,               general_protection),
        INTG(X86_TRAP_SPURIOUS,         spurious_interrupt_bug),
        INTG(X86_TRAP_MF,               coprocessor_error),

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 88ba5f0..3dfdc4d 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -264,16 +264,12 @@ DEFINE_IDTENTRY_ERRORCODE(exc_segment_not_present)
                      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)       \
-{                                                                         \
-       do_error_trap(regs, error_code, str, trapnr, signr, sicode, addr); \
+DEFINE_IDTENTRY_ERRORCODE(exc_stack_segment)
+{
+       do_error_trap(regs, error_code, "stack segment", X86_TRAP_SS, SIGBUS,
+                     0, NULL);
 }
 
-DO_ERROR(X86_TRAP_SS,     SIGBUS,           0, NULL, "stack segment",       stack_segment)
-#undef IP
-
 dotraplinkage void do_alignment_check(struct pt_regs *regs, long error_code)
 {
        char *str = "alignment check";

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 4e2a41e..8290f39 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -629,7 +629,7 @@ static struct trap_array_entry trap_array[] = {
        TRAP_ENTRY(exc_coproc_segment_overrun,          false ),
        TRAP_ENTRY(exc_invalid_tss,                     false ),
        TRAP_ENTRY(exc_segment_not_present,             false ),
-       { stack_segment,               xen_stack_segment,               false },
+       TRAP_ENTRY(exc_stack_segment,                   false ),
        { general_protection,          xen_general_protection,          false },
        { spurious_interrupt_bug,      xen_spurious_interrupt_bug,      false },
        { coprocessor_error,           xen_coprocessor_error,           false },

diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index c8ce7ad..0ecc055 100644 (file)
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -41,7 +41,7 @@ xen_pv_trap double_fault
 xen_pv_trap asm_exc_coproc_segment_overrun
 xen_pv_trap asm_exc_invalid_tss
 xen_pv_trap asm_exc_segment_not_present
-xen_pv_trap stack_segment
+xen_pv_trap asm_exc_stack_segment
 xen_pv_trap general_protection
 xen_pv_trap page_fault
 xen_pv_trap spurious_interrupt_bug