Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Stack trace management functions
 *
 *  Copyright IBM Corp. 2006
 *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 */
 
#include <linux/stacktrace.h>
#include <asm/stacktrace.h>
#include <asm/unwind.h>
#include <asm/kprobes.h>
 
void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
<------><------>     struct task_struct *task, struct pt_regs *regs)
{
<------>struct unwind_state state;
<------>unsigned long addr;
 
<------>unwind_for_each_frame(&state, task, regs, 0) {
<------><------>addr = unwind_get_return_address(&state);
<------><------>if (!addr || !consume_entry(cookie, addr))
<------><------><------>break;
<------>}
}
 
/*
 * This function returns an error if it detects any unreliable features of the
 * stack.  Otherwise it guarantees that the stack trace is reliable.
 *
 * If the task is not 'current', the caller *must* ensure the task is inactive.
 */
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
<------><------><------>     void *cookie, struct task_struct *task)
{
<------>struct unwind_state state;
<------>unsigned long addr;
 
<------>unwind_for_each_frame(&state, task, NULL, 0) {
<------><------>if (state.stack_info.type != STACK_TYPE_TASK)
<------><------><------>return -EINVAL;
 
<------><------>if (state.regs)
<------><------><------>return -EINVAL;
 
<------><------>addr = unwind_get_return_address(&state);
<------><------>if (!addr)
<------><------><------>return -EINVAL;
 
#ifdef CONFIG_KPROBES
<------><------>/*
<------><------> * Mark stacktraces with kretprobed functions on them
<------><------> * as unreliable.
<------><------> */
<------><------>if (state.ip == (unsigned long)kretprobe_trampoline)
<------><------><------>return -EINVAL;
#endif
 
<------><------>if (!consume_entry(cookie, addr))
<------><------><------>return -EINVAL;
<------>}
 
<------>/* Check for stack corruption */
<------>if (unwind_error(&state))
<------><------>return -EINVAL;
<------>return 0;
}