int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
BUILD_BUG_ON(AARCH64_INSN_SIZE != BREAK_INSTR_SIZE);
err = aarch64_insn_read((void *)bpt->bpt_addr, (u32 *)bpt->saved_instr);
if (err)
return err;
return aarch64_insn_write((void *)bpt->bpt_addr,
(u32)AARCH64_BREAK_KGDB_DYN_DBG);
}
int __kprobes aarch64_insn_patch_text_sync(void *addrs[], u32 insns[], int cnt)
{
struct aarch64_insn_patch patch = {
.text_addrs = addrs,
.new_insns = insns,
.insn_cnt = cnt,
.cpu_count = ATOMIC_INIT(0),
};
if (cnt <= 0)
return -EINVAL;
return stop_machine(aarch64_insn_patch_text_cb, &patch,
cpu_online_mask);
}
int __kprobes aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt)
{
int ret;
u32 insn;
/* Unsafe to patch multiple instructions without synchronizaiton */
if (cnt == 1) {
ret = aarch64_insn_read(addrs[0], &insn);
if (ret)
return ret;
if (aarch64_insn_hotpatch_safe(insn, insns[0])) {
/*
* ARMv8 architecture doesn't guarantee all CPUs see
* the new instruction after returning from function
* aarch64_insn_patch_text_nosync(). So send IPIs to
* all other CPUs to achieve instruction
* synchronization.
*/
ret = aarch64_insn_patch_text_nosync(addrs[0], insns[0]);
kick_all_cpus_sync();
return ret;
}
}
return aarch64_insn_patch_text_sync(addrs, insns, cnt);
}