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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-06-02 Jesven the first version
* 2023-06-24 WangXiaoyao Support backtrace for non-active thread
*/
#include "mm_aspace.h"
#include "mmu.h"
#include <rtthread.h>
#include <backtrace.h>
#include <stdlib.h>
#define BT_NESTING_MAX 100
static int unwind_frame(struct bt_frame *frame)
{
unsigned long fp = frame->fp;
if ((fp & 0x7)
#ifdef RT_USING_LWP
|| (rt_kmem_v2p((void *)fp) == ARCH_MAP_FAILED)
#endif
)
{
return 1;
}
frame->fp = *(unsigned long *)fp;
frame->pc = *(unsigned long *)(fp + 8);
if ((rt_kmem_v2p((void *)frame->pc) == ARCH_MAP_FAILED))
return 1;
return 0;
}
static void walk_unwind(unsigned long pc, unsigned long fp)
{
struct bt_frame frame = {fp, 1};
unsigned long lr = pc;
int nesting = 0;
while (nesting < BT_NESTING_MAX)
{
rt_kprintf(" %p", (void *)lr);
if (unwind_frame(&frame))
{
break;
}
lr = frame.pc;
nesting++;
}
}
void backtrace(unsigned long pc, unsigned long lr, unsigned long fp)
{
rt_kprintf("please use: addr2line -e rtthread.elf -a -f");
if (pc)
rt_kprintf(" %p", (void *)pc);
if (lr && fp)
walk_unwind(lr, fp);
rt_kprintf("\n");
}
int rt_backtrace(void)
{
unsigned long ra = (unsigned long)__builtin_return_address(0U);
unsigned long fr = (unsigned long)__builtin_frame_address(0U);
backtrace(0, ra, fr);
return 0;
}
MSH_CMD_EXPORT_ALIAS(rt_backtrace, bt_test, backtrace test);
#define ARCH_CONTEXT_FETCH(pctx, id) (*(((unsigned long *)pctx) + (id)))
int rt_backtrace_thread(rt_thread_t thread)
{
unsigned long lr;
unsigned long fp;
if (thread == rt_thread_self())
{
return -RT_EINVAL;
}
else
{
lr = ARCH_CONTEXT_FETCH(thread->sp, 3);
fp = ARCH_CONTEXT_FETCH(thread->sp, 7);
backtrace(0, lr, fp);
return 0;
}
}
#ifdef RT_USING_SMART
int rt_backtrace_user_thread(rt_thread_t thread)
{
unsigned long pc;
unsigned long lr;
unsigned long fp;
unsigned long ctx = (unsigned long)thread->user_ctx.ctx;
if (ctx > (unsigned long)thread->stack_addr
&& ctx < (unsigned long)thread->stack_addr + thread->stack_size)
{
pc = ARCH_CONTEXT_FETCH(thread->user_ctx.ctx, 0);
lr = ARCH_CONTEXT_FETCH(thread->user_ctx.ctx, 3);
fp = ARCH_CONTEXT_FETCH(thread->user_ctx.ctx, 7);
backtrace(pc, lr, fp);
return 0;
}
else
return -1;
}
#endif /* RT_USING_SMART */
static long custom_hex_to_long(const char* hex)
{
long result = 0;
int i = 0;
// Skip the "0x" prefix
if (hex[0] == '0' && (hex[1] == 'x' || hex[1] == 'X'))
{
i = 2;
}
// Convert each hex digit to its decimal value
for (; hex[i] != '\0'; i++)
{
char digit = hex[i];
if (digit >= '0' && digit <= '9')
{
result = result * 16 + (digit - '0');
}
else if (digit >= 'a' && digit <= 'f')
{
result = result * 16 + (digit - 'a' + 10);
}
else if (digit >= 'A' && digit <= 'F')
{
result = result * 16 + (digit - 'A' + 10);
}
else
{
// Invalid hex digit
return 0;
}
}
return result;
}
static void cmd_backtrace(int argc, char** argv)
{
long pid;
if (argc < 2)
{
rt_kprintf("please use: backtrace pid\n");
return;
}
if (strncmp(argv[1], "0x", 2) == 0)
{
pid = custom_hex_to_long(argv[1]);
}
else
{
pid = atol(argv[1]);
}
if (pid)
{
rt_kprintf("backtrace %s(0x%lx), from %s\n", ((rt_thread_t)pid)->parent.name, pid, argv[1]);
rt_backtrace_thread((rt_thread_t)pid);
}
}
MSH_CMD_EXPORT_ALIAS(cmd_backtrace, backtrace, print backtrace of a thread);
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