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Both uprobes and alternatives have insn_is_nop() variants, unify them and make sure insn_is_nop() works for both x86_64 and i386. Specifically, uprobe must not compare userspace instructions to kernel nops as that does not work right in the compat case. For the uprobe case we therefore must recognise common 32bit and 64bit nops. Because uprobe will consume the instruction as a nop, it must not mistakenly claim a non-nop instruction to be a nop. Eg. 'REX.b3 NOP' is 'xchg %r8,%rax' - not a nop. For the kernel case similar constraints apply, is it used to optimize NOPs by replacing strings of short(er) nops with longer nops. Must not claim an instruction is a nop if it really isn't. Not recognising a nop is non-fatal. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
#ifndef _ASM_X86_INSN_EVAL_H
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#define _ASM_X86_INSN_EVAL_H
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/*
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* A collection of utility functions for x86 instruction analysis to be
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* used in a kernel context. Useful when, for instance, making sense
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* of the registers indicated by operands.
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*/
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#include <linux/compiler.h>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <asm/ptrace.h>
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#define INSN_CODE_SEG_ADDR_SZ(params) ((params >> 4) & 0xf)
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#define INSN_CODE_SEG_OPND_SZ(params) (params & 0xf)
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#define INSN_CODE_SEG_PARAMS(oper_sz, addr_sz) (oper_sz | (addr_sz << 4))
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int pt_regs_offset(struct pt_regs *regs, int regno);
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bool insn_has_rep_prefix(struct insn *insn);
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void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs);
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int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs);
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int insn_get_modrm_reg_off(struct insn *insn, struct pt_regs *regs);
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unsigned long *insn_get_modrm_reg_ptr(struct insn *insn, struct pt_regs *regs);
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unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx);
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int insn_get_code_seg_params(struct pt_regs *regs);
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int insn_get_effective_ip(struct pt_regs *regs, unsigned long *ip);
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int insn_fetch_from_user(struct pt_regs *regs,
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unsigned char buf[MAX_INSN_SIZE]);
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int insn_fetch_from_user_inatomic(struct pt_regs *regs,
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unsigned char buf[MAX_INSN_SIZE]);
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bool insn_decode_from_regs(struct insn *insn, struct pt_regs *regs,
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unsigned char buf[MAX_INSN_SIZE], int buf_size);
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enum insn_mmio_type {
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INSN_MMIO_DECODE_FAILED,
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INSN_MMIO_WRITE,
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INSN_MMIO_WRITE_IMM,
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INSN_MMIO_READ,
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INSN_MMIO_READ_ZERO_EXTEND,
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INSN_MMIO_READ_SIGN_EXTEND,
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INSN_MMIO_MOVS,
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};
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enum insn_mmio_type insn_decode_mmio(struct insn *insn, int *bytes);
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bool insn_is_nop(struct insn *insn);
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#endif /* _ASM_X86_INSN_EVAL_H */
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