x86/entry: Convert Coprocessor segment overrun exception to IDTENTRY

Convert #OLD_MF to IDTENTRY:
  - 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/20200505134905.838823510@linutronix.de

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 7d7f283..916ce82 100644 (file)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1318,13 +1318,6 @@ SYM_CODE_START(native_iret)
 SYM_CODE_END(native_iret)
 #endif
 
-SYM_CODE_START(coprocessor_segment_overrun)
-       ASM_CLAC
-       pushl   $0
-       pushl   $do_coprocessor_segment_overrun
-       jmp     common_exception
-SYM_CODE_END(coprocessor_segment_overrun)
-
 SYM_CODE_START(invalid_TSS)
        ASM_CLAC
        pushl   $do_invalid_TSS

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index d7cf000..423c3a9 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_OLD_MF         coprocessor_segment_overrun     do_coprocessor_segment_overrun  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

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index fd6f996..0c33740 100644 (file)
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -82,5 +82,6 @@ DECLARE_IDTENTRY(X86_TRAP_OF,         exc_overflow);
 DECLARE_IDTENTRY(X86_TRAP_BR,          exc_bounds);
 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);
 
 #endif

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index e5f2c90..5e9d402 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 coprocessor_segment_overrun(void);
 asmlinkage void invalid_TSS(void);
 asmlinkage void segment_not_present(void);
 asmlinkage void stack_segment(void);
@@ -37,7 +36,6 @@ asmlinkage void xen_xennmi(void);
 asmlinkage void xen_xendebug(void);
 asmlinkage void xen_int3(void);
 asmlinkage void xen_double_fault(void);
-asmlinkage void xen_coprocessor_segment_overrun(void);
 asmlinkage void xen_invalid_TSS(void);
 asmlinkage void xen_segment_not_present(void);
 asmlinkage void xen_stack_segment(void);
@@ -56,7 +54,6 @@ 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_coprocessor_segment_overrun(struct pt_regs *regs, long error_code);
 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);

diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index cdc2d8b..758d325 100644 (file)
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -78,7 +78,7 @@ static const __initconst struct idt_data def_idts[] = {
        INTG(X86_TRAP_BR,               asm_exc_bounds),
        INTG(X86_TRAP_UD,               asm_exc_invalid_op),
        INTG(X86_TRAP_NM,               asm_exc_device_not_available),
-       INTG(X86_TRAP_OLD_MF,           coprocessor_segment_overrun),
+       INTG(X86_TRAP_OLD_MF,           asm_exc_coproc_segment_overrun),
        INTG(X86_TRAP_TS,               invalid_TSS),
        INTG(X86_TRAP_NP,               segment_not_present),
        INTG(X86_TRAP_SS,               stack_segment),

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index b8af5eb..3ce1f66 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -246,6 +246,12 @@ DEFINE_IDTENTRY(exc_invalid_op)
        handle_invalid_op(regs);
 }
 
+DEFINE_IDTENTRY(exc_coproc_segment_overrun)
+{
+       do_error_trap(regs, 0, "coprocessor segment overrun",
+                     X86_TRAP_OLD_MF, SIGFPE, 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)       \
@@ -253,7 +259,6 @@ 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_OLD_MF, SIGFPE,           0, NULL, "coprocessor segment overrun", coprocessor_segment_overrun)
 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)

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 94e2f91..027cc3d 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -626,7 +626,7 @@ static struct trap_array_entry trap_array[] = {
        TRAP_ENTRY(exc_bounds,                          false ),
        TRAP_ENTRY(exc_invalid_op,                      false ),
        TRAP_ENTRY(exc_device_not_available,            false ),
-       { coprocessor_segment_overrun, xen_coprocessor_segment_overrun, false },
+       TRAP_ENTRY(exc_coproc_segment_overrun,          false ),
        { invalid_TSS,                 xen_invalid_TSS,                 false },
        { segment_not_present,         xen_segment_not_present,         false },
        { stack_segment,               xen_stack_segment,               false },

diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 5215e57..7ac9c26 100644 (file)
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -38,7 +38,7 @@ xen_pv_trap asm_exc_bounds
 xen_pv_trap asm_exc_invalid_op
 xen_pv_trap asm_exc_device_not_available
 xen_pv_trap double_fault
-xen_pv_trap coprocessor_segment_overrun
+xen_pv_trap asm_exc_coproc_segment_overrun
 xen_pv_trap invalid_TSS
 xen_pv_trap segment_not_present
 xen_pv_trap stack_segment