arch/x86/include/asm/insn-eval.h

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/insn-eval.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/insn-eval.h
Extension
.h
Size
1751 bytes
Lines
50
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_X86_INSN_EVAL_H
#define _ASM_X86_INSN_EVAL_H
/*
 * A collection of utility functions for x86 instruction analysis to be
 * used in a kernel context. Useful when, for instance, making sense
 * of the registers indicated by operands.
 */

#include <linux/compiler.h>
#include <linux/bug.h>
#include <linux/err.h>
#include <asm/ptrace.h>

#define INSN_CODE_SEG_ADDR_SZ(params) ((params >> 4) & 0xf)
#define INSN_CODE_SEG_OPND_SZ(params) (params & 0xf)
#define INSN_CODE_SEG_PARAMS(oper_sz, addr_sz) (oper_sz | (addr_sz << 4))

int pt_regs_offset(struct pt_regs *regs, int regno);

bool insn_has_rep_prefix(struct insn *insn);
void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs);
int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs);
int insn_get_modrm_reg_off(struct insn *insn, struct pt_regs *regs);
unsigned long *insn_get_modrm_reg_ptr(struct insn *insn, struct pt_regs *regs);
unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx);
int insn_get_code_seg_params(struct pt_regs *regs);
int insn_get_effective_ip(struct pt_regs *regs, unsigned long *ip);
int insn_fetch_from_user(struct pt_regs *regs,
			 unsigned char buf[MAX_INSN_SIZE]);
int insn_fetch_from_user_inatomic(struct pt_regs *regs,
				  unsigned char buf[MAX_INSN_SIZE]);
bool insn_decode_from_regs(struct insn *insn, struct pt_regs *regs,
			   unsigned char buf[MAX_INSN_SIZE], int buf_size);

enum insn_mmio_type {
	INSN_MMIO_DECODE_FAILED,
	INSN_MMIO_WRITE,
	INSN_MMIO_WRITE_IMM,
	INSN_MMIO_READ,
	INSN_MMIO_READ_ZERO_EXTEND,
	INSN_MMIO_READ_SIGN_EXTEND,
	INSN_MMIO_MOVS,
};

enum insn_mmio_type insn_decode_mmio(struct insn *insn, int *bytes);

bool insn_is_nop(struct insn *insn);

#endif /* _ASM_X86_INSN_EVAL_H */

Annotation

Implementation Notes