/** * 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(vector, func) \
asmlinkage void asm_##func(void); \
asmlinkage void xen_asm_##func(void); \ void fred_##func(struct pt_regs *regs); \
__visible void func(struct pt_regs *regs)
/** * 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(func) \ static __always_inline void __##func(struct pt_regs *regs); \
\
__visible noinstr void func(struct pt_regs *regs) \
{ \
irqentry_state_t state = irqentry_enter(regs); \
\
instrumentation_begin(); \
__##func (regs); \
instrumentation_end(); \
irqentry_exit(regs, state); \
} \
\ static __always_inline void __##func(struct pt_regs *regs)
/* Special case for 32bit IRET 'trap' */ #define DECLARE_IDTENTRY_SW DECLARE_IDTENTRY #define DEFINE_IDTENTRY_SW DEFINE_IDTENTRY
/** * 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(vector, func) \
asmlinkage void asm_##func(void); \
asmlinkage void xen_asm_##func(void); \
__visible void func(struct pt_regs *regs, unsignedlong error_code)
/** * 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(func) \ static __always_inline void __##func(struct pt_regs *regs, \ unsignedlong error_code); \
\
__visible noinstr void func(struct pt_regs *regs, \ unsignedlong error_code) \
{ \
irqentry_state_t state = irqentry_enter(regs); \
\
instrumentation_begin(); \
__##func (regs, error_code); \
instrumentation_end(); \
irqentry_exit(regs, state); \
} \
\ static __always_inline void __##func(struct pt_regs *regs, \ unsignedlong error_code)
/** * 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(vector, func) \
DECLARE_IDTENTRY(vector, func)
/** * 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(func) \
__visible noinstr void func(struct pt_regs *regs)
/** * 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(func) \
noinstr void fred_##func(struct pt_regs *regs)
/** * 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(vector, func) \
DECLARE_IDTENTRY_ERRORCODE(vector, func)
/** * 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(func) \
__visible noinstr void func(struct pt_regs *regs, unsignedlong error_code)
/** * 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(vector, func) \
DECLARE_IDTENTRY_ERRORCODE(vector, func)
/** * 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(func) \ staticvoid __##func(struct pt_regs *regs, u32 vector); \
\
__visible noinstr void func(struct pt_regs *regs, \ unsignedlong error_code) \
{ \
irqentry_state_t state = irqentry_enter(regs); \
u32 vector = (u32)(u8)error_code; \
\
kvm_set_cpu_l1tf_flush_l1d(); \
instrumentation_begin(); \
run_irq_on_irqstack_cond(__##func, regs, vector); \
instrumentation_end(); \
irqentry_exit(regs, state); \
} \
\ static noinline void __##func(struct pt_regs *regs, u32 vector)
/** * 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(vector, func) \
DECLARE_IDTENTRY(vector, func)
/** * 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(func) \ staticvoid __##func(struct pt_regs *regs); \
\ static __always_inline void instr_##func(struct pt_regs *regs) \
{ \
run_sysvec_on_irqstack_cond(__##func, regs); \
} \
\
__visible noinstr void func(struct pt_regs *regs) \
{ \
irqentry_state_t state = irqentry_enter(regs); \
\
kvm_set_cpu_l1tf_flush_l1d(); \
instrumentation_begin(); \
instr_##func (regs); \
instrumentation_end(); \
irqentry_exit(regs, state); \
} \
\ void fred_##func(struct pt_regs *regs) \
{ \
instr_##func (regs); \
} \
\ static noinline void __##func(struct pt_regs *regs)
/** * 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(func) \ static __always_inline void __##func(struct pt_regs *regs); \
\ static __always_inline void instr_##func(struct pt_regs *regs) \
{ \
__irq_enter_raw(); \
__##func (regs); \
__irq_exit_raw(); \
} \
\
__visible noinstr void func(struct pt_regs *regs) \
{ \
irqentry_state_t state = irqentry_enter(regs); \
\
kvm_set_cpu_l1tf_flush_l1d(); \
instrumentation_begin(); \
instr_##func (regs); \
instrumentation_end(); \
irqentry_exit(regs, state); \
} \
\ void fred_##func(struct pt_regs *regs) \
{ \
instr_##func (regs); \
} \
\ static __always_inline void __##func(struct pt_regs *regs)
/** * 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(vector, func) \
DECLARE_IDTENTRY(vector, func)
#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(vector, func) \
DECLARE_IDTENTRY_RAW(vector, func); \
__visible void noist_##func(struct pt_regs *regs)
/** * 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(vector, func) \
DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func); \
__visible noinstr void kernel_##func(struct pt_regs *regs, unsignedlong error_code); \
__visible noinstr void user_##func(struct pt_regs *regs, unsignedlong error_code)
/** * 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(func) \
DEFINE_IDTENTRY_RAW(func)
/** * 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(func) \
DEFINE_IDTENTRY_RAW(noist_##func)
/** * 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(vector, func) \
DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func)
/** * 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(func) \
DEFINE_IDTENTRY_RAW_ERRORCODE(func)
/** * 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(func) \
DEFINE_IDTENTRY_RAW_ERRORCODE(kernel_##func)
/** * 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(func) \
DEFINE_IDTENTRY_RAW_ERRORCODE(user_##func)
#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(vector, func) \
asmlinkage void asm_##func(void); \
__visible void func(struct pt_regs *regs, \ unsignedlong error_code, \ unsignedlong address)
/** * 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(func) \
__visible noinstr void func(struct pt_regs *regs, \ unsignedlong error_code, \ unsignedlong address)
/* No ASM emitted for DF as this goes through a C shim */ # define DECLARE_IDTENTRY_DF(vector, func)
/* No ASM emitted for XEN hypervisor callback */ # define DECLARE_IDTENTRY_XENCB(vector, func)
#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(irq_entries_start)
vector=FIRST_EXTERNAL_VECTOR
.rept NR_EXTERNAL_VECTORS
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(irq_entries_start)
/* * 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 0xFFFF
/* Raw exception entries which need extra work */
DECLARE_IDTENTRY_RAW(X86_TRAP_UD, exc_invalid_op);
DECLARE_IDTENTRY_RAW(X86_TRAP_BP, exc_int3);
DECLARE_IDTENTRY_RAW_ERRORCODE(X86_TRAP_PF, exc_page_fault);
#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(X86_TRAP_NMI, exc_nmi_kvm_vmx); #endif
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