[tip: x86/entry] x86/entry: Convert Invalid Opcode exception to IDTENTRY

From: tip-bot2 for Thomas Gleixner
Date: Tue May 19 2020 - 16:01:35 EST

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

Commit-ID: a99471a459d4c89ff013363b06c6cb56fe4d7286
Gitweb: https://git.kernel.org/tip/a99471a459d4c89ff013363b06c6cb56fe4d7286
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 25 Feb 2020 23:16:18 +01:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 19 May 2020 16:03:59 +02:00

x86/entry: Convert Invalid Opcode exception to IDTENTRY

Convert #UD 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
- Fixup the FOOF bug call in fault.c
- 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/20200505134904.955511913@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 | 8 +++++---
arch/x86/kernel/idt.c | 2 +-
arch/x86/kernel/traps.c | 16 +++++++++++++++-
arch/x86/mm/fault.c | 2 +-
arch/x86/xen/enlighten_pv.c | 2 +-
arch/x86/xen/xen-asm_64.S | 2 +-
9 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 31a64df..95a9602 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1325,13 +1325,6 @@ SYM_CODE_START(native_iret)
SYM_CODE_END(native_iret)
#endif

-SYM_CODE_START(invalid_op)
- ASM_CLAC
- pushl $0
- pushl $do_invalid_op
- jmp common_exception
-SYM_CODE_END(invalid_op)
-
SYM_CODE_START(coprocessor_segment_overrun)
ASM_CLAC
pushl $0
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index a3e484d..ebd5f9f 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_UD invalid_op do_invalid_op has_error_code=0
idtentry X86_TRAP_NM device_not_available do_device_not_available 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
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index d7c160b..f34630f 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -80,5 +80,6 @@ static __always_inline void __##func(struct pt_regs *regs)
DECLARE_IDTENTRY(X86_TRAP_DE, exc_divide_error);
DECLARE_IDTENTRY(X86_TRAP_OF, exc_overflow);
DECLARE_IDTENTRY(X86_TRAP_BR, exc_bounds);
+DECLARE_IDTENTRY(X86_TRAP_UD, exc_invalid_op);

#endif
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 73fe4eb..71a4a7e 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -14,7 +14,6 @@
asmlinkage void debug(void);
asmlinkage void nmi(void);
asmlinkage void int3(void);
-asmlinkage void invalid_op(void);
asmlinkage void device_not_available(void);
#ifdef CONFIG_X86_64
asmlinkage void double_fault(void);
@@ -38,7 +37,6 @@ asmlinkage void simd_coprocessor_error(void);
asmlinkage void xen_xennmi(void);
asmlinkage void xen_xendebug(void);
asmlinkage void xen_int3(void);
-asmlinkage void xen_invalid_op(void);
asmlinkage void xen_device_not_available(void);
asmlinkage void xen_double_fault(void);
asmlinkage void xen_coprocessor_segment_overrun(void);
@@ -59,7 +57,6 @@ asmlinkage void xen_simd_coprocessor_error(void);
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_invalid_op(struct pt_regs *regs, long error_code);
dotraplinkage void do_device_not_available(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);
@@ -84,6 +81,11 @@ struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s);
void __init trap_init(void);
#endif

+#ifdef CONFIG_X86_F00F_BUG
+/* For handling the FOOF bug */
+void handle_invalid_op(struct pt_regs *regs);
+#endif
+
static inline int get_si_code(unsigned long condition)
{
if (condition & DR_STEP)
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 87583b6..8b48f54 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -76,7 +76,7 @@ static const __initconst struct idt_data def_idts[] = {
INTG(X86_TRAP_DE, asm_exc_divide_error),
INTG(X86_TRAP_NMI, nmi),
INTG(X86_TRAP_BR, asm_exc_bounds),
- INTG(X86_TRAP_UD, invalid_op),
+ INTG(X86_TRAP_UD, asm_exc_invalid_op),
INTG(X86_TRAP_NM, device_not_available),
INTG(X86_TRAP_OLD_MF, coprocessor_segment_overrun),
INTG(X86_TRAP_TS, invalid_TSS),
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 7a9fb8b..71ac43d 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -231,6 +231,21 @@ DEFINE_IDTENTRY(exc_overflow)
do_error_trap(regs, 0, "overflow", X86_TRAP_OF, SIGSEGV, 0, NULL);
}

+#ifdef CONFIG_X86_F00F_BUG
+void handle_invalid_op(struct pt_regs *regs)
+#else
+static inline void handle_invalid_op(struct pt_regs *regs)
+#endif
+{
+ do_error_trap(regs, 0, "invalid opcode", X86_TRAP_UD, SIGILL,
+ ILL_ILLOPN, error_get_trap_addr(regs));
+}
+
+DEFINE_IDTENTRY(exc_invalid_op)
+{
+ handle_invalid_op(regs);
+}
+
#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) \
@@ -238,7 +253,6 @@ 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_UD, SIGILL, ILL_ILLOPN, IP, "invalid opcode", invalid_op)
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)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 0715720..7c3ac7f 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -567,7 +567,7 @@ static int is_f00f_bug(struct pt_regs *regs, unsigned long address)
nr = (address - idt_descr.address) >> 3;

if (nr == 6) {
- do_invalid_op(regs, 0);
+ handle_invalid_op(regs);
return 1;
}
}
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index dfb4baa..87f409a 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -625,7 +625,7 @@ static struct trap_array_entry trap_array[] = {
{ page_fault, xen_page_fault, false },
TRAP_ENTRY(exc_divide_error, false ),
TRAP_ENTRY(exc_bounds, false ),
- { invalid_op, xen_invalid_op, false },
+ TRAP_ENTRY(exc_invalid_op, false ),
{ device_not_available, xen_device_not_available, false },
{ coprocessor_segment_overrun, xen_coprocessor_segment_overrun, false },
{ invalid_TSS, xen_invalid_TSS, false },
diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 2cdbf6a..999f09e 100644
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -35,7 +35,7 @@ xen_pv_trap int3
xen_pv_trap xennmi
xen_pv_trap asm_exc_overflow
xen_pv_trap asm_exc_bounds
-xen_pv_trap invalid_op
+xen_pv_trap asm_exc_invalid_op
xen_pv_trap device_not_available
xen_pv_trap double_fault
xen_pv_trap coprocessor_segment_overrun

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