cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

traps.c (2001B)

      1/*
      2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
      3 * Copyright (C) 2007-2009 PetaLogix
      4 * Copyright (C) 2006 Atmark Techno, Inc.
      5 *
      6 * This file is subject to the terms and conditions of the GNU General Public
      7 * License. See the file "COPYING" in the main directory of this archive
      8 * for more details.
      9 */
     10
     11#include <linux/export.h>
     12#include <linux/kernel.h>
     13#include <linux/kallsyms.h>
     14#include <linux/sched.h>
     15#include <linux/sched/debug.h>
     16#include <linux/debug_locks.h>
     17
     18#include <asm/exceptions.h>
     19#include <asm/unwind.h>
     20
     21void trap_init(void)
     22{
     23	__enable_hw_exceptions();
     24}
     25
     26static unsigned long kstack_depth_to_print;	/* 0 == entire stack */
     27
     28static int __init kstack_setup(char *s)
     29{
     30	return !kstrtoul(s, 0, &kstack_depth_to_print);
     31}
     32__setup("kstack=", kstack_setup);
     33
     34void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
     35{
     36	unsigned long words_to_show;
     37	u32 fp = (u32) sp;
     38
     39	if (fp == 0) {
     40		if (task) {
     41			fp = ((struct thread_info *)
     42				(task->stack))->cpu_context.r1;
     43		} else {
     44			/* Pick up caller of dump_stack() */
     45			fp = (u32)&sp - 8;
     46		}
     47	}
     48
     49	words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
     50	if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
     51		words_to_show = kstack_depth_to_print;
     52
     53	printk("%sKernel Stack:\n", loglvl);
     54
     55	/*
     56	 * Make the first line an 'odd' size if necessary to get
     57	 * remaining lines to start at an address multiple of 0x10
     58	 */
     59	if (fp & 0xF) {
     60		unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
     61		if (line1_words < words_to_show) {
     62			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
     63				       4, (void *)fp, line1_words << 2, 0);
     64			fp += line1_words << 2;
     65			words_to_show -= line1_words;
     66		}
     67	}
     68	print_hex_dump(loglvl, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
     69		       words_to_show << 2, 0);
     70	printk("%s\n\nCall Trace:\n", loglvl);
     71	microblaze_unwind(task, NULL, loglvl);
     72	printk("%s\n", loglvl);
     73
     74	if (!task)
     75		task = current;
     76
     77	debug_show_held_locks(task);
     78}