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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_IDTENTRY_H
#define _ASM_X86_IDTENTRY_H
/* Interrupts/Exceptions */
#include <asm/trapnr.h>
#ifndef __ASSEMBLY__
void idtentry_enter_user(struct pt_regs *regs);
void idtentry_exit_user(struct pt_regs *regs);
bool idtentry_enter_cond_rcu(struct pt_regs *regs);
void idtentry_exit_cond_rcu(struct pt_regs *regs, bool rcu_exit);
/**
* 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 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
*
* 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); \
__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.
*
* idtentry_enter() contains common code which has to be invoked before
* arbitrary code in the body. idtentry_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) \
{ \
bool rcu_exit = idtentry_enter_cond_rcu(regs); \
\
instrumentation_begin(); \
__##func (regs); \
instrumentation_end(); \
idtentry_exit_cond_rcu(regs, rcu_exit); \
} \
\
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, unsigned long 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, \
unsigned long error_code); \
\
__visible noinstr void func(struct pt_regs *regs, \
unsigned long error_code) \
{ \
bool rcu_exit = idtentry_enter_cond_rcu(regs); \
\
instrumentation_begin(); \
__##func (regs, error_code); \
instrumentation_end(); \
idtentry_exit_cond_rcu(regs, rcu_exit); \
} \
\
static __always_inline void __##func(struct pt_regs *regs, \
unsigned long 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)
/**
* 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
* 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_ERRORCODE(func) \
__visible noinstr void func(struct pt_regs *regs, unsigned long error_code)
/**
* 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)
/**
* 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)
#else /* CONFIG_X86_64 */
/* Maps to a regular IDTENTRY on 32bit for now */
# define DECLARE_IDTENTRY_IST DECLARE_IDTENTRY
# define DEFINE_IDTENTRY_IST DEFINE_IDTENTRY
/**
* 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, \
unsigned long error_code, \
unsigned long 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, \
unsigned long error_code, \
unsigned long address)
#endif /* !CONFIG_X86_64 */
/* C-Code mapping */
#define DECLARE_IDTENTRY_MCE DECLARE_IDTENTRY_IST
#define DEFINE_IDTENTRY_MCE DEFINE_IDTENTRY_IST
#define DEFINE_IDTENTRY_MCE_USER DEFINE_IDTENTRY_NOIST
#define DECLARE_IDTENTRY_NMI DECLARE_IDTENTRY_IST
#define DEFINE_IDTENTRY_NMI DEFINE_IDTENTRY_IST
#define DECLARE_IDTENTRY_DEBUG DECLARE_IDTENTRY_IST
#define DEFINE_IDTENTRY_DEBUG DEFINE_IDTENTRY_IST
#define DEFINE_IDTENTRY_DEBUG_USER DEFINE_IDTENTRY_NOIST
/**
* DECLARE_IDTENTRY_XEN - Declare functions for XEN redirect IDT entry points
* @vector: Vector number (ignored for C)
* @func: Function name of the entry point
*
* Used for xennmi and xendebug redirections. No DEFINE as this is all ASM
* indirection magic.
*/
#define DECLARE_IDTENTRY_XEN(vector, func) \
asmlinkage void xen_asm_exc_xen##func(void); \
asmlinkage void asm_exc_xen##func(void)
#else /* !__ASSEMBLY__ */
/*
* The ASM variants for DECLARE_IDTENTRY*() which emit the ASM entry stubs.
*/
#define DECLARE_IDTENTRY(vector, func) \
idtentry vector asm_##func func has_error_code=0 sane=1
#define DECLARE_IDTENTRY_ERRORCODE(vector, func) \
idtentry vector asm_##func func has_error_code=1 sane=1
/* Special case for 32bit IRET 'trap'. Do not emit ASM code */
#define DECLARE_IDTENTRY_SW(vector, func)
#define DECLARE_IDTENTRY_RAW(vector, func) \
DECLARE_IDTENTRY(vector, func)
#define DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func) \
DECLARE_IDTENTRY_ERRORCODE(vector, func)
#ifdef CONFIG_X86_64
# define DECLARE_IDTENTRY_MCE(vector, func) \
idtentry_mce_db vector asm_##func func
# define DECLARE_IDTENTRY_DEBUG(vector, func) \
idtentry_mce_db vector asm_##func func
# define DECLARE_IDTENTRY_DF(vector, func) \
idtentry_df vector asm_##func func
# define DECLARE_IDTENTRY_XENCB(vector, func) \
DECLARE_IDTENTRY(vector, func)
#else
# define DECLARE_IDTENTRY_MCE(vector, func) \
DECLARE_IDTENTRY(vector, func)
# define DECLARE_IDTENTRY_DEBUG(vector, func) \
DECLARE_IDTENTRY(vector, func)
/* 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)
/* XEN NMI and DB wrapper */
#define DECLARE_IDTENTRY_XEN(vector, func) \
idtentry vector asm_exc_xen##func exc_##func has_error_code=0 sane=1
#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
* whistels.
*/
#define X86_TRAP_OTHER 0xFFFF
/* Simple exception entry points. No hardware error code */
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);
DECLARE_IDTENTRY(X86_TRAP_NM, exc_device_not_available);
DECLARE_IDTENTRY(X86_TRAP_OLD_MF, exc_coproc_segment_overrun);
DECLARE_IDTENTRY(X86_TRAP_SPURIOUS, exc_spurious_interrupt_bug);
DECLARE_IDTENTRY(X86_TRAP_MF, exc_coprocessor_error);
DECLARE_IDTENTRY(X86_TRAP_XF, exc_simd_coprocessor_error);
/* 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(X86_TRAP_TS, exc_invalid_tss);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_NP, exc_segment_not_present);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_SS, exc_stack_segment);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_GP, exc_general_protection);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_AC, exc_alignment_check);
/* Raw exception entries which need extra work */
DECLARE_IDTENTRY_RAW(X86_TRAP_BP, exc_int3);
DECLARE_IDTENTRY_RAW_ERRORCODE(X86_TRAP_PF, exc_page_fault);
#ifdef CONFIG_X86_MCE
DECLARE_IDTENTRY_MCE(X86_TRAP_MC, exc_machine_check);
#endif
/* NMI */
DECLARE_IDTENTRY_NMI(X86_TRAP_NMI, exc_nmi);
DECLARE_IDTENTRY_XEN(X86_TRAP_NMI, nmi);
/* #DB */
DECLARE_IDTENTRY_DEBUG(X86_TRAP_DB, exc_debug);
DECLARE_IDTENTRY_XEN(X86_TRAP_DB, debug);
/* #DF */
DECLARE_IDTENTRY_DF(X86_TRAP_DF, exc_double_fault);
#ifdef CONFIG_XEN_PV
DECLARE_IDTENTRY_XENCB(X86_TRAP_OTHER, exc_xen_hypervisor_callback);
#endif
#undef X86_TRAP_OTHER
#endif
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