cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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stacktrace.c (1755B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * arch/sh/kernel/stacktrace.c
      4 *
      5 * Stack trace management functions
      6 *
      7 *  Copyright (C) 2006 - 2008  Paul Mundt
      8 */
      9#include <linux/sched.h>
     10#include <linux/sched/debug.h>
     11#include <linux/stacktrace.h>
     12#include <linux/thread_info.h>
     13#include <linux/module.h>
     14#include <asm/unwinder.h>
     15#include <asm/ptrace.h>
     16#include <asm/stacktrace.h>
     17
     18/*
     19 * Save stack-backtrace addresses into a stack_trace buffer.
     20 */
     21static void save_stack_address(void *data, unsigned long addr, int reliable)
     22{
     23	struct stack_trace *trace = data;
     24
     25	if (!reliable)
     26		return;
     27
     28	if (trace->skip > 0) {
     29		trace->skip--;
     30		return;
     31	}
     32
     33	if (trace->nr_entries < trace->max_entries)
     34		trace->entries[trace->nr_entries++] = addr;
     35}
     36
     37static const struct stacktrace_ops save_stack_ops = {
     38	.address = save_stack_address,
     39};
     40
     41void save_stack_trace(struct stack_trace *trace)
     42{
     43	unsigned long *sp = (unsigned long *)current_stack_pointer;
     44
     45	unwind_stack(current, NULL, sp,  &save_stack_ops, trace);
     46}
     47EXPORT_SYMBOL_GPL(save_stack_trace);
     48
     49static void
     50save_stack_address_nosched(void *data, unsigned long addr, int reliable)
     51{
     52	struct stack_trace *trace = (struct stack_trace *)data;
     53
     54	if (!reliable)
     55		return;
     56
     57	if (in_sched_functions(addr))
     58		return;
     59
     60	if (trace->skip > 0) {
     61		trace->skip--;
     62		return;
     63	}
     64
     65	if (trace->nr_entries < trace->max_entries)
     66		trace->entries[trace->nr_entries++] = addr;
     67}
     68
     69static const struct stacktrace_ops save_stack_ops_nosched = {
     70	.address = save_stack_address_nosched,
     71};
     72
     73void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
     74{
     75	unsigned long *sp = (unsigned long *)tsk->thread.sp;
     76
     77	unwind_stack(current, NULL, sp,  &save_stack_ops_nosched, trace);
     78}
     79EXPORT_SYMBOL_GPL(save_stack_trace_tsk);