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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
* 2023-10-16 Shell Support a new backtrace framework
*/
#include <rtthread.h>
#include <rthw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mm_aspace.h"
#include "mmu.h"
#define INST_WORD_BYTES 4
#define WORD sizeof(rt_base_t)
#define ARCH_CONTEXT_FETCH(pctx, id) (*(((unsigned long *)pctx) + (id)))
#define PTR_NORMALIZE(ptr) (ptr = rt_backtrace_ptr_normalize(ptr))
rt_weak void *rt_backtrace_ptr_normalize(void *ptr)
{
return ptr;
}
rt_inline rt_err_t _bt_kaddr(rt_ubase_t *fp, struct rt_hw_backtrace_frame *frame)
{
rt_err_t rc;
PTR_NORMALIZE(fp);
frame->fp = *fp;
frame->pc = *(fp + 1) - INST_WORD_BYTES;
if ((rt_ubase_t)fp == frame->fp)
{
rc = -RT_ERROR;
}
else
{
rc = RT_EOK;
}
return rc;
}
#ifdef RT_USING_SMART
#include <lwp_user_mm.h>
rt_inline rt_err_t _bt_uaddr(rt_lwp_t lwp, rt_ubase_t *fp, struct rt_hw_backtrace_frame *frame)
{
rt_err_t rc;
if (lwp_data_get(lwp, &frame->fp, fp, WORD) != WORD)
{
rc = -RT_EFAULT;
}
else if (lwp_data_get(lwp, &frame->pc, fp + 1, WORD) != WORD)
{
rc = -RT_EFAULT;
}
else if ((rt_base_t)fp == frame->fp)
{
rc = -RT_ERROR;
}
else
{
frame->pc -= INST_WORD_BYTES;
rc = RT_EOK;
}
return rc;
}
#endif /* RT_USING_SMART */
rt_err_t rt_hw_backtrace_frame_unwind(rt_thread_t thread, struct rt_hw_backtrace_frame *frame)
{
rt_err_t rc = -RT_ERROR;
rt_ubase_t *fp = (rt_ubase_t *)frame->fp;
if (fp && !((long)fp & 0x7))
{
#ifdef RT_USING_SMART
if (thread && thread->lwp && rt_scheduler_is_available())
{
rt_lwp_t lwp = thread->lwp;
void *this_lwp = lwp_self();
if (this_lwp == lwp && rt_kmem_v2p(fp) != ARCH_MAP_FAILED)
{
rc = _bt_kaddr(fp, frame);
}
else if (lwp_user_accessible_ext(lwp, fp, sizeof(rt_base_t)))
{
rc = _bt_uaddr(lwp, fp, frame);
}
else
{
rc = -RT_EFAULT;
}
}
else
#endif
if (rt_kmem_v2p(fp) != ARCH_MAP_FAILED)
{
rc = _bt_kaddr(fp, frame);
}
else
{
rc = -RT_EFAULT;
}
}
else
{
rc = -RT_EFAULT;
}
return rc;
}
rt_err_t rt_hw_backtrace_frame_get(rt_thread_t thread, struct rt_hw_backtrace_frame *frame)
{
rt_err_t rc;
if (!thread || !frame)
{
rc = -RT_EINVAL;
}
else
{
frame->pc = ARCH_CONTEXT_FETCH(thread->sp, 3);
frame->fp = ARCH_CONTEXT_FETCH(thread->sp, 7);
rc = RT_EOK;
}
return rc;
}
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