// SPDX-License-Identifier: GPL-2
.0
#include <linux/syscalls
.h>
#include <linux/pid
.h>
#include <linux/perf_event
.h>
#include <linux/hw_breakpoint
.h>
#include <linux/sched
.h>
#include <linux/slab
.h>
#include <asm/fpsimd
.h>
#include <linux/thread_info
.h>
#include <linux/uaccess
.h> // 新增用户态访问头文件
static struct perf_event *bp;
static void hit_handler(struct perf_event *bp,
struct perf_sample_data *data,
struct pt_regs *regs)
{
int i;
struct user_fpsimd_state fp;
struct
task_struct *current_
task = current;
pr_info("=== HWBP hit @%p ===\n", (void *)regs->pc);
/* 通用寄存器 */
for (i = 0; i < 31; ++i)
pr_info("X%-2d = 0x%016llx\n", i, regs->regs[i]);
pr_info("SP = 0x%016llx\n", regs->sp);
pr_info("PC = 0x%016llx\n", regs->pc);
pr_info("LR = 0x%016llx\n", regs->regs[30]);
/* 浮点寄存器：5
.15+ 正确方式 */
if (!user_mode(regs)) {
fpsimd_save_state(&fp); // 内核态直接保存
} else {
// 用户态需通过线程信息访问
memcpy(&fp, ¤t_
task->thread
.uw
.fpsimd_state, sizeof(fp));
}
pr_info("【浮点寄存器 S0-S31 (32-bit)】\n");
for (i = 0; i < 32; ++i)
pr_info("S%-2d = 0x%08x\n", i, (u32)(fp
.vregs[i] & 0xFFFFFFFF));
pr_info("【浮点寄存器 D0-D31 (64-bit)】\n");
for (i = 0; i < 32; ++i)
pr_info("D%-2d = 0x%016llx\n", i, fp
.vregs[i]);
pr_info("【命中地址】PC = 0x%016llx\n", regs->pc);
pr_info("【返回地址】LR = 0x%016llx\n", regs->regs[30]);
}
SYSCALL_DEFINE4(process_vm_writev, int, pid, unsigned long long, addr,
int, len, int, type)
{
struct perf_event_attr attr = {};
struct pid *pid_struct;
struct
task_struct *tsk;
if (bp && !IS_ERR(bp)) {
unregister_hw_breakpoint(bp);
bp = NULL;
}
pid_struct = find_get_pid(pid);
if (!pid_struct)
return -ESRCH;
tsk = get_pid_
task(pid_struct, PIDTYPE_PID);
put_pid(pid_struct);
if (!tsk)
return -ESRCH;
attr
.type = PERF_TYPE_BREAKPOINT;
attr
.size = sizeof(attr);
attr
.bp_addr = addr;
attr
.bp_len = (len == 8) ? HW_BREAKPOINT_LEN_8 : HW_BREAKPOINT_LEN_4;
switch (type) {
case 0: attr
.bp_type = HW_BREAKPOINT_R; break;
case 1: attr
.bp_type = HW_BREAKPOINT_W; break;
case 2: attr
.bp_type = HW_BREAKPOINT_RW; break;
case 3: attr
.bp_type = HW_BREAKPOINT_X; break;
default: return -EINVAL;
}
// 5
.15+ 正确参数顺序（新增 group 参数）
bp = register_wide_hw_breakpoint(&attr, hit_handler, NULL, tsk, NULL);
return IS_ERR(bp) ? PTR_ERR(bp) : 0;
}报错:root@localhost:~/5
.15-13# tools/bazel run //common:kernel_aarch64_dist --config=fast
INFO: Analyzed target //common:kernel_aarch64_dist (0 packages loaded, 0 targets configured)
.
INFO: Found 1 target
...
ERROR: /root/5
.15-13/common/BUILD
.bazel:52:22: Building kernel kernel_aarch64 failed: (Exit 2): bash failed: error executing com
mand (from target //common:kernel_aarch64) /bin/bash -c
... (remaining 1 argument skipped)
/root/5
.15-13/common/kernel/sys
.c:3032:60: error: too
many arguments to function call, expected 3, have 5
bp = register_wide_hw_breakpoint(&attr, hit_handler, NULL, tsk, NULL);
~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~~~~~~~~
/root/5
.15-13/common/include/linux/hw_breakpoint
.h:70:1: note: 'register_wide_hw_breakpoint' declared here
register_wide_hw_breakpoint(struct perf_event_attr *attr,
^
1 error generated
.
make[2]: *** [/root/5
.15-13/common/scripts/Makefile
.build:287: kernel/sys
.o] Error 1
make[1]: *** [/root/5
.15-13/common/Makefile:1953: kernel] Error 2
make: *** [Makefile:244: __sub-make] Error 2
Target //common:kernel_aarch64_dist failed to build
Use --verbose_failures to see the com
mand lines of failed build steps
.
ERROR: /root/5
.15-13/common/BUILD
.bazel:52:22 Middle
man _middlemen/common_Skernel_Uaarch64_Udist-runfiles failed: (Exit 2): bash failed: error executing com
mand (from target //common:kernel_aarch64) /bin/bash -c
... (remaining 1 argument skipped)
INFO: Elapsed time: 39
.149s, Critical Path: 38
.07s
INFO: 4 processes: 4 internal
.
FAILED: Build did NOT complete successfully
FAILED: Build did NOT complete successfully
root@localhost:~/5
.15-13#
修复好完整发给我 要求可以给任意进程硬件断点 中文注释
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