x86/entry: Convert Invalid TSS exception to IDTENTRY

Convert #TS 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/20200505134905.350676449@linutronix.de

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 916ce82..2143a62 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(invalid_TSS)
-       ASM_CLAC
-       pushl   $do_invalid_TSS
-       jmp     common_exception
-SYM_CODE_END(invalid_TSS)
-
 SYM_CODE_START(segment_not_present)
        ASM_CLAC
        pushl   $do_segment_not_present

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 423c3a9..07307cf 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_TS             invalid_TSS             do_invalid_TSS                  has_error_code=1
 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

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index f35d5c9..aa0d465 100644 (file)
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -130,4 +130,7 @@ DECLARE_IDTENTRY(X86_TRAP_UD,               exc_invalid_op);
 DECLARE_IDTENTRY(X86_TRAP_NM,          exc_device_not_available);
 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);
+
 #endif

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 5e9d402..30bc589 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 invalid_TSS(void);
 asmlinkage void segment_not_present(void);
 asmlinkage void stack_segment(void);
 asmlinkage void general_protection(void);
@@ -36,7 +35,6 @@ asmlinkage void xen_xennmi(void);
 asmlinkage void xen_xendebug(void);
 asmlinkage void xen_int3(void);
 asmlinkage void xen_double_fault(void);
-asmlinkage void xen_invalid_TSS(void);
 asmlinkage void xen_segment_not_present(void);
 asmlinkage void xen_stack_segment(void);
 asmlinkage void xen_general_protection(void);
@@ -54,7 +52,6 @@ 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_invalid_TSS(struct pt_regs *regs, long error_code);
 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);

diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 758d325..caa740d 100644 (file)
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -79,7 +79,7 @@ static const __initconst struct idt_data def_idts[] = {
        INTG(X86_TRAP_UD,               asm_exc_invalid_op),
        INTG(X86_TRAP_NM,               asm_exc_device_not_available),
        INTG(X86_TRAP_OLD_MF,           asm_exc_coproc_segment_overrun),
-       INTG(X86_TRAP_TS,               invalid_TSS),
+       INTG(X86_TRAP_TS,               asm_exc_invalid_tss),
        INTG(X86_TRAP_NP,               segment_not_present),
        INTG(X86_TRAP_SS,               stack_segment),
        INTG(X86_TRAP_GP,               general_protection),

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 3ce1f66..10ab083 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -252,6 +252,12 @@ DEFINE_IDTENTRY(exc_coproc_segment_overrun)
                      X86_TRAP_OLD_MF, SIGFPE, 0, NULL);
 }
 
+DEFINE_IDTENTRY_ERRORCODE(exc_invalid_tss)
+{
+       do_error_trap(regs, error_code, "invalid TSS", X86_TRAP_TS, SIGSEGV,
+                     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)       \
@@ -259,7 +265,6 @@ 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_TS,     SIGSEGV,          0, NULL, "invalid TSS",         invalid_TSS)
 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 027cc3d..650ce23 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -627,7 +627,7 @@ static struct trap_array_entry trap_array[] = {
        TRAP_ENTRY(exc_invalid_op,                      false ),
        TRAP_ENTRY(exc_device_not_available,            false ),
        TRAP_ENTRY(exc_coproc_segment_overrun,          false ),
-       { invalid_TSS,                 xen_invalid_TSS,                 false },
+       TRAP_ENTRY(exc_invalid_tss,                     false ),
        { segment_not_present,         xen_segment_not_present,         false },
        { stack_segment,               xen_stack_segment,               false },
        { general_protection,          xen_general_protection,          false },

diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 7ac9c26..f7a890c 100644 (file)
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -39,7 +39,7 @@ xen_pv_trap asm_exc_invalid_op
 xen_pv_trap asm_exc_device_not_available
 xen_pv_trap double_fault
 xen_pv_trap asm_exc_coproc_segment_overrun
-xen_pv_trap invalid_TSS
+xen_pv_trap asm_exc_invalid_tss
 xen_pv_trap segment_not_present
 xen_pv_trap stack_segment
 xen_pv_trap general_protection