/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_IDTENTRY_H #define _ASM_X86_IDTENTRY_H /* Interrupts/Exceptions */ #include <asm/trapnr.h> #define IDT_ALIGN … #ifndef __ASSEMBLY__ #include <linux/entry-common.h> #include <linux/hardirq.h> #include <asm/irq_stack.h> typedef void (*idtentry_t)(struct pt_regs *regs); /** * DECLARE_IDTENTRY - Declare functions for simple IDT entry points * No error code pushed by hardware * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Declares four functions: * - The ASM entry point: asm_##func * - The XEN PV trap entry point: xen_##func (maybe unused) * - The C handler called from the FRED event dispatcher (maybe unused) * - The C handler called from the ASM entry point * * Note: This is the C variant of DECLARE_IDTENTRY(). As the name says it * declares the entry points for usage in C code. There is an ASM variant * as well which is used to emit the entry stubs in entry_32/64.S. */ #define DECLARE_IDTENTRY … /** * DEFINE_IDTENTRY - Emit code for simple IDT entry points * @func: Function name of the entry point * * @func is called from ASM entry code with interrupts disabled. * * The macro is written so it acts as function definition. Append the * body with a pair of curly brackets. * * irqentry_enter() contains common code which has to be invoked before * arbitrary code in the body. irqentry_exit() contains common code * which has to run before returning to the low level assembly code. */ #define DEFINE_IDTENTRY … /* Special case for 32bit IRET 'trap' */ #define DECLARE_IDTENTRY_SW … #define DEFINE_IDTENTRY_SW … /** * DECLARE_IDTENTRY_ERRORCODE - Declare functions for simple IDT entry points * Error code pushed by hardware * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Declares three functions: * - The ASM entry point: asm_##func * - The XEN PV trap entry point: xen_##func (maybe unused) * - The C handler called from the ASM entry point * * Same as DECLARE_IDTENTRY, but has an extra error_code argument for the * C-handler. */ #define DECLARE_IDTENTRY_ERRORCODE … /** * DEFINE_IDTENTRY_ERRORCODE - Emit code for simple IDT entry points * Error code pushed by hardware * @func: Function name of the entry point * * Same as DEFINE_IDTENTRY, but has an extra error_code argument */ #define DEFINE_IDTENTRY_ERRORCODE … /** * DECLARE_IDTENTRY_RAW - Declare functions for raw IDT entry points * No error code pushed by hardware * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Maps to DECLARE_IDTENTRY(). */ #define DECLARE_IDTENTRY_RAW … /** * DEFINE_IDTENTRY_RAW - Emit code for raw IDT entry points * @func: Function name of the entry point * * @func is called from ASM entry code with interrupts disabled. * * The macro is written so it acts as function definition. Append the * body with a pair of curly brackets. * * Contrary to DEFINE_IDTENTRY() this does not invoke the * idtentry_enter/exit() helpers before and after the body invocation. This * needs to be done in the body itself if applicable. Use if extra work * is required before the enter/exit() helpers are invoked. */ #define DEFINE_IDTENTRY_RAW … /** * DEFINE_FREDENTRY_RAW - Emit code for raw FRED entry points * @func: Function name of the entry point * * @func is called from the FRED event dispatcher with interrupts disabled. * * See @DEFINE_IDTENTRY_RAW for further details. */ #define DEFINE_FREDENTRY_RAW … /** * DECLARE_IDTENTRY_RAW_ERRORCODE - Declare functions for raw IDT entry points * Error code pushed by hardware * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Maps to DECLARE_IDTENTRY_ERRORCODE() */ #define DECLARE_IDTENTRY_RAW_ERRORCODE … /** * DEFINE_IDTENTRY_RAW_ERRORCODE - Emit code for raw IDT entry points * @func: Function name of the entry point * * @func is called from ASM entry code with interrupts disabled. * * The macro is written so it acts as function definition. Append the * body with a pair of curly brackets. * * Contrary to DEFINE_IDTENTRY_ERRORCODE() this does not invoke the * irqentry_enter/exit() helpers before and after the body invocation. This * needs to be done in the body itself if applicable. Use if extra work * is required before the enter/exit() helpers are invoked. */ #define DEFINE_IDTENTRY_RAW_ERRORCODE … /** * DECLARE_IDTENTRY_IRQ - Declare functions for device interrupt IDT entry * points (common/spurious) * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Maps to DECLARE_IDTENTRY_ERRORCODE() */ #define DECLARE_IDTENTRY_IRQ … /** * DEFINE_IDTENTRY_IRQ - Emit code for device interrupt IDT entry points * @func: Function name of the entry point * * The vector number is pushed by the low level entry stub and handed * to the function as error_code argument which needs to be truncated * to an u8 because the push is sign extending. * * irq_enter/exit_rcu() are invoked before the function body and the * KVM L1D flush request is set. Stack switching to the interrupt stack * has to be done in the function body if necessary. */ #define DEFINE_IDTENTRY_IRQ … /** * DECLARE_IDTENTRY_SYSVEC - Declare functions for system vector entry points * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Declares three functions: * - The ASM entry point: asm_##func * - The XEN PV trap entry point: xen_##func (maybe unused) * - The C handler called from the ASM entry point * * Maps to DECLARE_IDTENTRY(). */ #define DECLARE_IDTENTRY_SYSVEC … /** * DEFINE_IDTENTRY_SYSVEC - Emit code for system vector IDT entry points * @func: Function name of the entry point * * irqentry_enter/exit() and irq_enter/exit_rcu() are invoked before the * function body. KVM L1D flush request is set. * * Runs the function on the interrupt stack if the entry hit kernel mode */ #define DEFINE_IDTENTRY_SYSVEC … /** * DEFINE_IDTENTRY_SYSVEC_SIMPLE - Emit code for simple system vector IDT * entry points * @func: Function name of the entry point * * Runs the function on the interrupted stack. No switch to IRQ stack and * only the minimal __irq_enter/exit() handling. * * Only use for 'empty' vectors like reschedule IPI and KVM posted * interrupt vectors. */ #define DEFINE_IDTENTRY_SYSVEC_SIMPLE … /** * DECLARE_IDTENTRY_XENCB - Declare functions for XEN HV callback entry point * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Declares three functions: * - The ASM entry point: asm_##func * - The XEN PV trap entry point: xen_##func (maybe unused) * - The C handler called from the ASM entry point * * Maps to DECLARE_IDTENTRY(). Distinct entry point to handle the 32/64-bit * difference */ #define DECLARE_IDTENTRY_XENCB … #ifdef CONFIG_X86_64 /** * DECLARE_IDTENTRY_IST - Declare functions for IST handling IDT entry points * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Maps to DECLARE_IDTENTRY_RAW, but declares also the NOIST C handler * which is called from the ASM entry point on user mode entry */ #define DECLARE_IDTENTRY_IST … /** * DECLARE_IDTENTRY_VC - Declare functions for the VC entry point * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Maps to DECLARE_IDTENTRY_RAW_ERRORCODE, but declares also the * safe_stack C handler. */ #define DECLARE_IDTENTRY_VC … /** * DEFINE_IDTENTRY_IST - Emit code for IST entry points * @func: Function name of the entry point * * Maps to DEFINE_IDTENTRY_RAW */ #define DEFINE_IDTENTRY_IST … /** * DEFINE_IDTENTRY_NOIST - Emit code for NOIST entry points which * belong to a IST entry point (MCE, DB) * @func: Function name of the entry point. Must be the same as * the function name of the corresponding IST variant * * Maps to DEFINE_IDTENTRY_RAW(). */ #define DEFINE_IDTENTRY_NOIST … /** * DECLARE_IDTENTRY_DF - Declare functions for double fault * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Maps to DECLARE_IDTENTRY_RAW_ERRORCODE */ #define DECLARE_IDTENTRY_DF … /** * DEFINE_IDTENTRY_DF - Emit code for double fault * @func: Function name of the entry point * * Maps to DEFINE_IDTENTRY_RAW_ERRORCODE */ #define DEFINE_IDTENTRY_DF … /** * DEFINE_IDTENTRY_VC_KERNEL - Emit code for VMM communication handler when raised from kernel mode * @func: Function name of the entry point * * Maps to DEFINE_IDTENTRY_RAW_ERRORCODE */ #define DEFINE_IDTENTRY_VC_KERNEL … /** * DEFINE_IDTENTRY_VC_USER - Emit code for VMM communication handler when raised from user mode * @func: Function name of the entry point * * Maps to DEFINE_IDTENTRY_RAW_ERRORCODE */ #define DEFINE_IDTENTRY_VC_USER … #else /* CONFIG_X86_64 */ /** * DECLARE_IDTENTRY_DF - Declare functions for double fault 32bit variant * @vector: Vector number (ignored for C) * @func: Function name of the entry point * * Declares two functions: * - The ASM entry point: asm_##func * - The C handler called from the C shim */ #define DECLARE_IDTENTRY_DF … /** * DEFINE_IDTENTRY_DF - Emit code for double fault on 32bit * @func: Function name of the entry point * * This is called through the doublefault shim which already provides * cr2 in the address argument. */ #define DEFINE_IDTENTRY_DF … #endif /* !CONFIG_X86_64 */ /* C-Code mapping */ #define DECLARE_IDTENTRY_NMI … #define DEFINE_IDTENTRY_NMI … #define DEFINE_FREDENTRY_NMI … #ifdef CONFIG_X86_64 #define DECLARE_IDTENTRY_MCE … #define DEFINE_IDTENTRY_MCE … #define DEFINE_IDTENTRY_MCE_USER … #define DEFINE_FREDENTRY_MCE … #define DECLARE_IDTENTRY_DEBUG … #define DEFINE_IDTENTRY_DEBUG … #define DEFINE_IDTENTRY_DEBUG_USER … #define DEFINE_FREDENTRY_DEBUG … #endif void idt_install_sysvec(unsigned int n, const void *function); #ifdef CONFIG_X86_FRED void fred_install_sysvec(unsigned int vector, const idtentry_t function); #else static inline void fred_install_sysvec(unsigned int vector, const idtentry_t function) { } #endif #define sysvec_install … #else /* !__ASSEMBLY__ */ /* * The ASM variants for DECLARE_IDTENTRY*() which emit the ASM entry stubs. */ #define DECLARE_IDTENTRY(vector, func) … #define DECLARE_IDTENTRY_ERRORCODE(vector, func) … /* Special case for 32bit IRET 'trap'. Do not emit ASM code */ #define DECLARE_IDTENTRY_SW(vector, func) … #define DECLARE_IDTENTRY_RAW(vector, func) … #define DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func) … /* Entries for common/spurious (device) interrupts */ #define DECLARE_IDTENTRY_IRQ(vector, func) … /* System vector entries */ #define DECLARE_IDTENTRY_SYSVEC(vector, func) … #ifdef CONFIG_X86_64 #define DECLARE_IDTENTRY_MCE(vector, func) … #define DECLARE_IDTENTRY_DEBUG(vector, func) … #define DECLARE_IDTENTRY_DF(vector, func) … #define DECLARE_IDTENTRY_XENCB(vector, func) … #define DECLARE_IDTENTRY_VC(vector, func) … #else #define DECLARE_IDTENTRY_MCE … /* No ASM emitted for DF as this goes through a C shim */ #define DECLARE_IDTENTRY_DF … /* No ASM emitted for XEN hypervisor callback */ #define DECLARE_IDTENTRY_XENCB … #endif /* No ASM code emitted for NMI */ #define DECLARE_IDTENTRY_NMI(vector, func) … /* * ASM code to emit the common vector entry stubs where each stub is * packed into IDT_ALIGN bytes. * * Note, that the 'pushq imm8' is emitted via '.byte 0x6a, vector' because * GCC treats the local vector variable as unsigned int and would expand * all vectors above 0x7F to a 5 byte push. The original code did an * adjustment of the vector number to be in the signed byte range to avoid * this. While clever it's mindboggling counterintuitive and requires the * odd conversion back to a real vector number in the C entry points. Using * .byte achieves the same thing and the only fixup needed in the C entry * point is to mask off the bits above bit 7 because the push is sign * extending. */ .align IDT_ALIGN SYM_CODE_START(…) vector= … UNWIND_HINT_IRET_REGS 0 : ENDBR .byte 0x6a, vector jmp asm_common_interrupt /* Ensure that the above is IDT_ALIGN bytes max */ .fill 0b + IDT_ALIGN - ., 1, 0xcc vector = vector+1 .endr SYM_CODE_END(…) #ifdef CONFIG_X86_LOCAL_APIC .align IDT_ALIGN SYM_CODE_START(…) vector=FIRST_SYSTEM_VECTOR .rept NR_SYSTEM_VECTORS UNWIND_HINT_IRET_REGS 0 : ENDBR .byte 0x6a, vector jmp asm_spurious_interrupt /* Ensure that the above is IDT_ALIGN bytes max */ .fill 0b + IDT_ALIGN - ., 1, 0xcc vector = vector+1 .endr SYM_CODE_END(…) #endif #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. */ /* * Dummy trap number so the low level ASM macro vector number checks do not * match which results in emitting plain IDTENTRY stubs without bells and * whistles. */ #define X86_TRAP_OTHER … /* Simple exception entry points. No hardware error code */ DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); DECLARE_IDTENTRY(…); /* 32bit software IRET trap. Do not emit ASM code */ DECLARE_IDTENTRY_SW(X86_TRAP_IRET, iret_error); /* Simple exception entries with error code pushed by hardware */ DECLARE_IDTENTRY_ERRORCODE(…); DECLARE_IDTENTRY_ERRORCODE(…); DECLARE_IDTENTRY_ERRORCODE(…); DECLARE_IDTENTRY_ERRORCODE(…); DECLARE_IDTENTRY_ERRORCODE(…); /* Raw exception entries which need extra work */ DECLARE_IDTENTRY_RAW(…); DECLARE_IDTENTRY_RAW(…); DECLARE_IDTENTRY_RAW_ERRORCODE(…); #if defined(CONFIG_IA32_EMULATION) DECLARE_IDTENTRY_RAW(…); #endif #ifdef CONFIG_X86_MCE #ifdef CONFIG_X86_64 DECLARE_IDTENTRY_MCE(…); #else DECLARE_IDTENTRY_RAW(X86_TRAP_MC, exc_machine_check); #endif #ifdef CONFIG_XEN_PV DECLARE_IDTENTRY_RAW(…); #endif #endif /* NMI */ #if IS_ENABLED(CONFIG_KVM_INTEL) /* * Special entry point for VMX which invokes this on the kernel stack, even for * 64-bit, i.e. without using an IST. asm_exc_nmi() requires an IST to work * correctly vs. the NMI 'executing' marker. Used for 32-bit kernels as well * to avoid more ifdeffery. */ DECLARE_IDTENTRY(…); #endif DECLARE_IDTENTRY_NMI(X86_TRAP_NMI, exc_nmi); #ifdef CONFIG_XEN_PV DECLARE_IDTENTRY_RAW(…); #endif /* #DB */ #ifdef CONFIG_X86_64 DECLARE_IDTENTRY_DEBUG(…); #else DECLARE_IDTENTRY_RAW(X86_TRAP_DB, exc_debug); #endif #ifdef CONFIG_XEN_PV DECLARE_IDTENTRY_RAW(…); #endif /* #DF */ DECLARE_IDTENTRY_DF(…); #ifdef CONFIG_XEN_PV DECLARE_IDTENTRY_RAW_ERRORCODE(…); #endif /* #CP */ #ifdef CONFIG_X86_CET DECLARE_IDTENTRY_ERRORCODE(…); #endif /* #VC */ #ifdef CONFIG_AMD_MEM_ENCRYPT DECLARE_IDTENTRY_VC(…); #endif #ifdef CONFIG_XEN_PV DECLARE_IDTENTRY_XENCB(…); DECLARE_IDTENTRY_RAW(…); #endif #ifdef CONFIG_INTEL_TDX_GUEST DECLARE_IDTENTRY(…); #endif /* Device interrupts common/spurious */ DECLARE_IDTENTRY_IRQ(…); #ifdef CONFIG_X86_LOCAL_APIC DECLARE_IDTENTRY_IRQ(…); #endif /* System vector entry points */ #ifdef CONFIG_X86_LOCAL_APIC DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); #endif #ifdef CONFIG_SMP DECLARE_IDTENTRY(…); DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); #else #define fred_sysvec_reschedule_ipi … #define fred_sysvec_reboot … #define fred_sysvec_call_function_single … #define fred_sysvec_call_function … #endif #ifdef CONFIG_X86_LOCAL_APIC # ifdef CONFIG_X86_MCE_THRESHOLD DECLARE_IDTENTRY_SYSVEC(…); # else #define fred_sysvec_threshold … # endif # ifdef CONFIG_X86_MCE_AMD DECLARE_IDTENTRY_SYSVEC(…); # else #define fred_sysvec_deferred_error … # endif # ifdef CONFIG_X86_THERMAL_VECTOR DECLARE_IDTENTRY_SYSVEC(…); # else #define fred_sysvec_thermal … # endif # ifdef CONFIG_IRQ_WORK DECLARE_IDTENTRY_SYSVEC(…); # else #define fred_sysvec_irq_work … # endif #endif #if IS_ENABLED(CONFIG_KVM) DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); #else #define fred_sysvec_kvm_posted_intr_ipi … #define fred_sysvec_kvm_posted_intr_wakeup_ipi … #define fred_sysvec_kvm_posted_intr_nested_ipi … #endif # ifdef CONFIG_X86_POSTED_MSI DECLARE_IDTENTRY_SYSVEC(…); #else #define fred_sysvec_posted_msi_notification … # endif #if IS_ENABLED(CONFIG_HYPERV) DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); DECLARE_IDTENTRY_SYSVEC(…); #endif #if IS_ENABLED(CONFIG_ACRN_GUEST) DECLARE_IDTENTRY_SYSVEC(…); #endif #ifdef CONFIG_XEN_PVHVM DECLARE_IDTENTRY_SYSVEC(…); #endif #ifdef CONFIG_KVM_GUEST DECLARE_IDTENTRY_SYSVEC(…); #endif #undef X86_TRAP_OTHER #endif
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