156 строки
3.0 KiB
C
156 строки
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2014-2016 Pratyush Anand <panand@redhat.com>
|
|
*/
|
|
#include <linux/highmem.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/uprobes.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
#include "decode-insn.h"
|
|
|
|
#define UPROBE_TRAP_NR UINT_MAX
|
|
|
|
bool is_swbp_insn(uprobe_opcode_t *insn)
|
|
{
|
|
return (*insn & 0xffff) == UPROBE_SWBP_INSN;
|
|
}
|
|
|
|
unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
|
|
{
|
|
return instruction_pointer(regs);
|
|
}
|
|
|
|
int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
|
|
unsigned long addr)
|
|
{
|
|
probe_opcode_t insn;
|
|
|
|
insn = *(probe_opcode_t *)(&auprobe->insn[0]);
|
|
|
|
auprobe->insn_size = is_insn32(insn) ? 4 : 2;
|
|
|
|
switch (csky_probe_decode_insn(&insn, &auprobe->api)) {
|
|
case INSN_REJECTED:
|
|
return -EINVAL;
|
|
|
|
case INSN_GOOD_NO_SLOT:
|
|
auprobe->simulate = true;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
|
|
{
|
|
struct uprobe_task *utask = current->utask;
|
|
|
|
utask->autask.saved_trap_no = current->thread.trap_no;
|
|
current->thread.trap_no = UPROBE_TRAP_NR;
|
|
|
|
instruction_pointer_set(regs, utask->xol_vaddr);
|
|
|
|
user_enable_single_step(current);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
|
|
{
|
|
struct uprobe_task *utask = current->utask;
|
|
|
|
WARN_ON_ONCE(current->thread.trap_no != UPROBE_TRAP_NR);
|
|
|
|
instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
|
|
|
|
user_disable_single_step(current);
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool arch_uprobe_xol_was_trapped(struct task_struct *t)
|
|
{
|
|
if (t->thread.trap_no != UPROBE_TRAP_NR)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
|
|
{
|
|
probe_opcode_t insn;
|
|
unsigned long addr;
|
|
|
|
if (!auprobe->simulate)
|
|
return false;
|
|
|
|
insn = *(probe_opcode_t *)(&auprobe->insn[0]);
|
|
addr = instruction_pointer(regs);
|
|
|
|
if (auprobe->api.handler)
|
|
auprobe->api.handler(insn, addr, regs);
|
|
|
|
return true;
|
|
}
|
|
|
|
void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
|
|
{
|
|
struct uprobe_task *utask = current->utask;
|
|
|
|
/*
|
|
* Task has received a fatal signal, so reset back to probbed
|
|
* address.
|
|
*/
|
|
instruction_pointer_set(regs, utask->vaddr);
|
|
|
|
user_disable_single_step(current);
|
|
}
|
|
|
|
bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx,
|
|
struct pt_regs *regs)
|
|
{
|
|
if (ctx == RP_CHECK_CHAIN_CALL)
|
|
return regs->usp <= ret->stack;
|
|
else
|
|
return regs->usp < ret->stack;
|
|
}
|
|
|
|
unsigned long
|
|
arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long ra;
|
|
|
|
ra = regs->lr;
|
|
|
|
regs->lr = trampoline_vaddr;
|
|
|
|
return ra;
|
|
}
|
|
|
|
int arch_uprobe_exception_notify(struct notifier_block *self,
|
|
unsigned long val, void *data)
|
|
{
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
int uprobe_breakpoint_handler(struct pt_regs *regs)
|
|
{
|
|
if (uprobe_pre_sstep_notifier(regs))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int uprobe_single_step_handler(struct pt_regs *regs)
|
|
{
|
|
if (uprobe_post_sstep_notifier(regs))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|