x86/entry: Convert Alignment check exception to IDTENTRY
Convert #AC 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 - Remove the RCU warning as the new entry macro ensures correctness No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Andy Lutomirski <luto@kernel.org> Link: https://lkml.kernel.org/r/20200505134905.928967113@linutronix.de
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14a8bd2aa7
Коммит
436608bb00
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@ -1311,12 +1311,6 @@ SYM_CODE_START(native_iret)
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SYM_CODE_END(native_iret)
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#endif
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SYM_CODE_START(alignment_check)
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ASM_CLAC
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pushl $do_alignment_check
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jmp common_exception
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SYM_CODE_END(alignment_check)
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#ifdef CONFIG_X86_MCE
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SYM_CODE_START(machine_check)
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ASM_CLAC
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@ -1073,7 +1073,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
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*/
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idtentry X86_TRAP_BP int3 do_int3 has_error_code=0
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idtentry X86_TRAP_AC alignment_check do_alignment_check has_error_code=1
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idtentry X86_TRAP_XF simd_coprocessor_error do_simd_coprocessor_error has_error_code=0
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idtentry X86_TRAP_PF page_fault do_page_fault has_error_code=1
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@ -137,5 +137,6 @@ DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_TS, exc_invalid_tss);
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DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_NP, exc_segment_not_present);
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DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_SS, exc_stack_segment);
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DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_GP, exc_general_protection);
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DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_AC, exc_alignment_check);
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#endif
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@ -19,7 +19,6 @@ asmlinkage void double_fault(void);
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#endif
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asmlinkage void page_fault(void);
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asmlinkage void async_page_fault(void);
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asmlinkage void alignment_check(void);
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#ifdef CONFIG_X86_MCE
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asmlinkage void machine_check(void);
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#endif /* CONFIG_X86_MCE */
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@ -31,7 +30,6 @@ asmlinkage void xen_xendebug(void);
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asmlinkage void xen_int3(void);
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asmlinkage void xen_double_fault(void);
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asmlinkage void xen_page_fault(void);
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asmlinkage void xen_alignment_check(void);
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#ifdef CONFIG_X86_MCE
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asmlinkage void xen_machine_check(void);
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#endif /* CONFIG_X86_MCE */
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@ -43,7 +41,6 @@ dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
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dotraplinkage void do_int3(struct pt_regs *regs, long error_code);
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dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
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dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);
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dotraplinkage void do_alignment_check(struct pt_regs *regs, long error_code);
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dotraplinkage void do_simd_coprocessor_error(struct pt_regs *regs, long error_code);
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#ifdef CONFIG_X86_32
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dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code);
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@ -85,7 +85,7 @@ static const __initconst struct idt_data def_idts[] = {
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INTG(X86_TRAP_GP, asm_exc_general_protection),
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INTG(X86_TRAP_SPURIOUS, asm_exc_spurious_interrupt_bug),
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INTG(X86_TRAP_MF, asm_exc_coprocessor_error),
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INTG(X86_TRAP_AC, alignment_check),
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INTG(X86_TRAP_AC, asm_exc_alignment_check),
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INTG(X86_TRAP_XF, simd_coprocessor_error),
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#ifdef CONFIG_X86_32
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@ -270,12 +270,10 @@ DEFINE_IDTENTRY_ERRORCODE(exc_stack_segment)
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0, NULL);
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}
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dotraplinkage void do_alignment_check(struct pt_regs *regs, long error_code)
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DEFINE_IDTENTRY_ERRORCODE(exc_alignment_check)
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{
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char *str = "alignment check";
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RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
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if (notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_AC, SIGBUS) == NOTIFY_STOP)
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return;
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@ -633,7 +633,7 @@ static struct trap_array_entry trap_array[] = {
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TRAP_ENTRY(exc_general_protection, false ),
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TRAP_ENTRY(exc_spurious_interrupt_bug, false ),
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TRAP_ENTRY(exc_coprocessor_error, false ),
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{ alignment_check, xen_alignment_check, false },
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TRAP_ENTRY(exc_alignment_check, false ),
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{ simd_coprocessor_error, xen_simd_coprocessor_error, false },
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};
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@ -46,7 +46,7 @@ xen_pv_trap asm_exc_general_protection
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xen_pv_trap page_fault
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xen_pv_trap asm_exc_spurious_interrupt_bug
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xen_pv_trap asm_exc_coprocessor_error
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xen_pv_trap alignment_check
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xen_pv_trap asm_exc_alignment_check
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#ifdef CONFIG_X86_MCE
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xen_pv_trap machine_check
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#endif /* CONFIG_X86_MCE */
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