[tip: x86/entry] x86/entry: Convert Coprocessor segment overrun exception to IDTENTRY

From: tip-bot2 for Thomas Gleixner
Date: Tue May 19 2020 - 16:01:20 EST

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The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 2c1a8d98ef858628327b260362258549c816cf18
Gitweb: https://git.kernel.org/tip/2c1a8d98ef858628327b260362258549c816cf18
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 25 Feb 2020 23:16:20 +01:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 19 May 2020 16:04:00 +02:00

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@xxxxxxxxxxxxx>
Reviewed-by: Alexandre Chartre <alexandre.chartre@xxxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200505134905.838823510@xxxxxxxxxxxxx

---
arch/x86/entry/entry_32.S | 7 -------
arch/x86/entry/entry_64.S | 1 -
arch/x86/include/asm/idtentry.h | 1 +
arch/x86/include/asm/traps.h | 3 ---
arch/x86/kernel/idt.c | 2 +-
arch/x86/kernel/traps.c | 7 ++++++-
arch/x86/xen/enlighten_pv.c | 2 +-
arch/x86/xen/xen-asm_64.S | 2 +-
8 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 7d7f283..916ce82 100644
--- 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
--- 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
--- 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
--- 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
--- 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
--- 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 3ca2abf..a3bfc1f 100644
--- 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_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
--- 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

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