From: Thomas Gleixner
Convert #DE 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
No functional change.
Signed-off-by: Thomas Gleixner
Reviewed-by: Alexandre Chartre
---
V2: Add comment to explain the DECLARE_IDTENTRY macro magic at the
actual usage site.
---
arch/x86/entry/entry_32.S |7 ---
arch/x86/entry/entry_64.S |1 -
arch/x86/include/asm/idtentry.h | 12
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 |7 ++-
arch/x86/xen/xen-asm_64.S |2 +-
8 files changed, 26 insertions(+), 15 deletions(-)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1377,13 +1377,6 @@ SYM_CODE_START(alignment_check)
jmp common_exception
SYM_CODE_END(alignment_check)
-SYM_CODE_START(divide_error)
- ASM_CLAC
- pushl $0 # no error code
- pushl $do_divide_error
- jmp common_exception
-SYM_CODE_END(divide_error)
-
#ifdef CONFIG_X86_MCE
SYM_CODE_START(machine_check)
ASM_CLAC
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1073,7 +1073,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work
* Exception entry points.
*/
-idtentry X86_TRAP_DE divide_errordo_divide_error
has_error_code=0
idtentry X86_TRAP_OF overflowdo_overflow
has_error_code=0
idtentry X86_TRAP_BP int3do_int3
has_error_code=0
idtentry X86_TRAP_BR bounds do_bounds
has_error_code=0
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -67,4 +67,16 @@ static __always_inline void __##func(str
#endif /* __ASSEMBLY__ */
+/*
+ * The actual entry points. Note that DECLARE_IDTENTRY*() serves two
+ * purposes:
+ * - provide the function declarations when included from C-Code
+ * - emit the ASM stubs when included from entry_32/64.S
+ *
+ * This avoids duplicate defines and ensures that everything is consistent.
+ */
+
+/* Simple exception entry points. No hardware error code */
+DECLARE_IDTENTRY(X86_TRAP_DE, exc_divide_error);
+
#endif
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -11,7 +11,6 @@
#define dotraplinkage __visible
-asmlinkage void divide_error(void);
asmlinkage void debug(void);
asmlinkage void nmi(void);
asmlinkage void int3(void);
@@ -38,7 +37,6 @@ asmlinkage void machine_check(void);
asmlinkage void simd_coprocessor_error(void);
#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
-asmlinkage void xen_divide_error(void);
asmlinkage void xen_xennmi(void);
asmlinkage void xen_xendebug(void);
asmlinkage void xen_int3(void);
@@ -62,7 +60,6 @@ asmlinkage void xen_machine_check(void);
asmlinkage void xen_simd_coprocessor_error(void);
#endif
-dotraplinkage void do_divide_error(struct pt_regs *regs, long error_code);
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);
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -70,7 +70,7 @@ static const __initconst struct idt_data
* set up TSS.
*/
static const __initconst struct idt_data def_idts[] = {
- INTG(X86_TRAP_DE, divide_error),
+ INTG(X86_TRAP_DE, asm_exc_divide_error),
INTG(X86_TRAP_NMI, nmi),
INTG(X86_TRAP_BR, bounds),
INTG(X86_TRAP_UD, invalid_op),
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -210,6 +210,12 @@ static __always_inline void __user *erro
return (void __user *)uprobe_get_trap_addr(regs);
}
+DEFINE_IDTENTRY(exc_divide_error)
+{
+ do_error_trap(regs, 0, "divide_error", X86_TRAP_DE, SIGFPE,
+ FPE_INTDIV, error_get_trap_addr(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) \
@@ -217,7 +223,6 @@ dotraplinkage void do_##name(struct pt_r
do_error_trap(regs, error_code, str, trapnr, signr, sicode, addr); \
}
-DO_ERROR(X86_TRAP_DE, SIGFPE, FPE_INTDIV, IP, "divide error",
divide_error)
DO_ERROR(X86_TRAP_OF, SIGSEGV, 0, NULL, "overflow",
overflow)
DO_ERROR(X86_TRAP_UD, SIGILL, ILL_ILLOPN, IP, "invalid opcode",
invalid_op)
DO_ERROR(X86_TRAP_OLD_MF, SIGFPE,
