static int arch_copy_kprobe(struct kprobe *p)
{
int ret;
/* Copy an instruction with recovering if other optprobe modifies it.*/
ret = __copy_instruction(p->ainsn.insn, p->addr);
if (!ret)
return -EINVAL;
/*
* __copy_instruction can modify the displacement of the instruction,
* but it doesn't affect boostable check.
*/
if (can_boost(p->ainsn.insn))
p->ainsn.boostable = 0;
else
p->ainsn.boostable = -1;
/* Check whether the instruction modifies Interrupt Flag or not */
p->ainsn.if_modifier = is_IF_modifier(p->ainsn.insn);
/* Also, displacement change doesn't affect the first byte */
p->opcode = p->ainsn.insn[0];
return 0;
}
static void __kprobes arch_copy_kprobe(struct kprobe *p)
{
memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
fix_riprel(p);
if (can_boost(p->addr))
p->ainsn.boostable = 0;
else
p->ainsn.boostable = -1;
p->opcode = *p->addr;
}
static void __kprobes arch_copy_kprobe(struct kprobe *p)
{
/*
* Copy an instruction without recovering int3, because it will be
* put by another subsystem.
*/
__copy_instruction(p->ainsn.insn, p->addr, 0);
if (can_boost(p->addr))
p->ainsn.boostable = 0;
else
p->ainsn.boostable = -1;
p->opcode = *p->addr;
}
int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
/* insn: must be on special executable page on i386. */
p->ainsn.insn = get_insn_slot();
if (!p->ainsn.insn)
return -ENOMEM;
memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
p->opcode = *p->addr;
if (can_boost(p->addr)) {
p->ainsn.boostable = 0;
} else {
p->ainsn.boostable = -1;
}
return 0;
}
static void __kprobes arch_copy_kprobe(struct kprobe *p)
{
/* Copy an instruction with recovering if other optprobe modifies it.*/
__copy_instruction(p->ainsn.insn, p->addr);
/*
* __copy_instruction can modify the displacement of the instruction,
* but it doesn't affect boostable check.
*/
if (can_boost(p->ainsn.insn))
p->ainsn.boostable = 0;
else
p->ainsn.boostable = -1;
/* Also, displacement change doesn't affect the first byte */
p->opcode = p->ainsn.insn[0];
}
/* Prepare reljump right after instruction to boost */
static int prepare_boost(kprobe_opcode_t *buf, struct kprobe *p,
struct insn *insn)
{
int len = insn->length;
if (can_boost(insn, p->addr) &&
MAX_INSN_SIZE - len >= RELATIVEJUMP_SIZE) {
/*
* These instructions can be executed directly if it
* jumps back to correct address.
*/
synthesize_reljump(buf + len, p->ainsn.insn + len,
p->addr + insn->length);
len += RELATIVEJUMP_SIZE;
p->ainsn.boostable = true;
} else {
p->ainsn.boostable = false;
}
return len;
}
