2013-01-18 09:42:21 +00:00
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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*/
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#include <linux/ptrace.h>
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2013-01-18 09:42:23 +00:00
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/kdev_t.h>
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#include <linux/fs_struct.h>
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#include <linux/proc_fs.h>
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#include <linux/file.h>
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#include <asm/arcregs.h>
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/*
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* Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
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* -Prints 3 regs per line and a CR.
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* -To continue, callee regs right after scratch, special handling of CR
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*/
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static noinline void print_reg_file(long *reg_rev, int start_num)
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{
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unsigned int i;
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char buf[512];
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int n = 0, len = sizeof(buf);
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for (i = start_num; i < start_num + 13; i++) {
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n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
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i, (unsigned long)*reg_rev);
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if (((i + 1) % 3) == 0)
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n += scnprintf(buf + n, len - n, "\n");
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2013-03-22 11:46:49 +00:00
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/* because pt_regs has regs reversed: r12..r0, r25..r13 */
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2013-01-18 09:42:23 +00:00
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reg_rev--;
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}
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if (start_num != 0)
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n += scnprintf(buf + n, len - n, "\n\n");
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2013-03-22 11:46:49 +00:00
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/* To continue printing callee regs on same line as scratch regs */
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if (start_num == 0)
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pr_info("%s", buf);
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else
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pr_cont("%s\n", buf);
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2013-01-18 09:42:23 +00:00
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}
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static void show_callee_regs(struct callee_regs *cregs)
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{
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print_reg_file(&(cregs->r13), 13);
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}
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void print_task_path_n_nm(struct task_struct *tsk, char *buf)
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{
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struct path path;
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char *path_nm = NULL;
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struct mm_struct *mm;
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struct file *exe_file;
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mm = get_task_mm(tsk);
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if (!mm)
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goto done;
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exe_file = get_mm_exe_file(mm);
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mmput(mm);
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if (exe_file) {
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path = exe_file->f_path;
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path_get(&exe_file->f_path);
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fput(exe_file);
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path_nm = d_path(&path, buf, 255);
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path_put(&path);
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}
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done:
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2013-04-30 22:27:19 +00:00
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pr_info("Path: %s\n", path_nm);
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2013-01-18 09:42:23 +00:00
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}
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EXPORT_SYMBOL(print_task_path_n_nm);
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static void show_faulting_vma(unsigned long address, char *buf)
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{
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struct vm_area_struct *vma;
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struct inode *inode;
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unsigned long ino = 0;
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dev_t dev = 0;
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char *nm = buf;
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2013-03-22 11:46:49 +00:00
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/* can't use print_vma_addr() yet as it doesn't check for
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* non-inclusive vma
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*/
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2013-01-18 09:42:23 +00:00
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vma = find_vma(current->active_mm, address);
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/* check against the find_vma( ) behaviour which returns the next VMA
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* if the container VMA is not found
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*/
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if (vma && (vma->vm_start <= address)) {
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struct file *file = vma->vm_file;
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if (file) {
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struct path *path = &file->f_path;
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nm = d_path(path, buf, PAGE_SIZE - 1);
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2013-06-16 13:25:12 +00:00
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inode = file_inode(vma->vm_file);
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2013-01-18 09:42:23 +00:00
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dev = inode->i_sb->s_dev;
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ino = inode->i_ino;
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}
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pr_info(" @off 0x%lx in [%s]\n"
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2013-03-22 11:46:49 +00:00
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" VMA: 0x%08lx to 0x%08lx\n",
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vma->vm_start < TASK_UNMAPPED_BASE ?
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address : address - vma->vm_start,
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nm, vma->vm_start, vma->vm_end);
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} else {
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2013-01-18 09:42:23 +00:00
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pr_info(" @No matching VMA found\n");
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2013-03-22 11:46:49 +00:00
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}
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2013-01-18 09:42:23 +00:00
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}
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static void show_ecr_verbose(struct pt_regs *regs)
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{
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2013-06-11 13:26:54 +00:00
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unsigned int vec, cause_code;
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2013-01-18 09:42:23 +00:00
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unsigned long address;
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2013-06-11 13:26:54 +00:00
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pr_info("\n[ECR ]: 0x%08lx => ", regs->event);
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2013-01-18 09:42:23 +00:00
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/* For Data fault, this is data address not instruction addr */
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address = current->thread.fault_address;
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2013-06-11 13:26:54 +00:00
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vec = regs->ecr_vec;
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cause_code = regs->ecr_cause;
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2013-01-18 09:42:23 +00:00
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/* For DTLB Miss or ProtV, display the memory involved too */
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if (vec == ECR_V_DTLB_MISS) {
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2013-06-12 10:05:18 +00:00
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pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
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(cause_code == 0x01) ? "Read" :
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((cause_code == 0x02) ? "Write" : "EX"),
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2013-01-18 09:42:23 +00:00
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address, regs->ret);
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} else if (vec == ECR_V_ITLB_MISS) {
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pr_cont("Insn could not be fetched\n");
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} else if (vec == ECR_V_MACH_CHK) {
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pr_cont("%s\n", (cause_code == 0x0) ?
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"Double Fault" : "Other Fatal Err");
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} else if (vec == ECR_V_PROTV) {
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if (cause_code == ECR_C_PROTV_INST_FETCH)
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pr_cont("Execute from Non-exec Page\n");
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else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
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pr_cont("Misaligned r/w from 0x%08lx\n", address);
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2013-06-12 10:05:18 +00:00
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else
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pr_cont("%s access not allowed on page\n",
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(cause_code == 0x01) ? "Read" :
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((cause_code == 0x02) ? "Write" : "EX"));
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2013-01-18 09:42:23 +00:00
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} else if (vec == ECR_V_INSN_ERR) {
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pr_cont("Illegal Insn\n");
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} else {
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pr_cont("Check Programmer's Manual\n");
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}
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}
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/************************************************************************
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* API called by rest of kernel
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***********************************************************************/
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2013-01-18 09:42:21 +00:00
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void show_regs(struct pt_regs *regs)
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{
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2013-01-18 09:42:23 +00:00
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struct task_struct *tsk = current;
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struct callee_regs *cregs;
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char *buf;
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buf = (char *)__get_free_page(GFP_TEMPORARY);
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if (!buf)
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return;
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print_task_path_n_nm(tsk, buf);
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dump_stack: unify debug information printed by show_regs()
show_regs() is inherently arch-dependent but it does make sense to print
generic debug information and some archs already do albeit in slightly
different forms. This patch introduces a generic function to print debug
information from show_regs() so that different archs print out the same
information and it's much easier to modify what's printed.
show_regs_print_info() prints out the same debug info as dump_stack()
does plus task and thread_info pointers.
* Archs which didn't print debug info now do.
alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r,
metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc,
um, xtensa
* Already prints debug info. Replaced with show_regs_print_info().
The printed information is superset of what used to be there.
arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86
* s390 is special in that it used to print arch-specific information
along with generic debug info. Heiko and Martin think that the
arch-specific extra isn't worth keeping s390 specfic implementation.
Converted to use the generic version.
Note that now all archs print the debug info before actual register
dumps.
An example BUG() dump follows.
kernel BUG at /work/os/work/kernel/workqueue.c:4841!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7
Hardware name: empty empty/S3992, BIOS 080011 10/26/2007
task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000
RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6
RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246
RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001
RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a
RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650
0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d
ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760
Call Trace:
[<ffffffff81000312>] do_one_initcall+0x122/0x170
[<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8
[<ffffffff81c47760>] ? rest_init+0x140/0x140
[<ffffffff81c4776e>] kernel_init+0xe/0xf0
[<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0
[<ffffffff81c47760>] ? rest_init+0x140/0x140
...
v2: Typo fix in x86-32.
v3: CPU number dropped from show_regs_print_info() as
dump_stack_print_info() has been updated to print it. s390
specific implementation dropped as requested by s390 maintainers.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile bits]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-30 22:27:17 +00:00
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show_regs_print_info(KERN_INFO);
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2013-01-18 09:42:23 +00:00
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2013-06-11 13:26:54 +00:00
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show_ecr_verbose(regs);
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2013-01-18 09:42:23 +00:00
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2013-03-22 11:46:49 +00:00
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pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n",
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current->thread.fault_address,
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(void *)regs->blink, (void *)regs->ret);
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2013-01-18 09:42:23 +00:00
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2013-03-22 11:46:49 +00:00
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if (user_mode(regs))
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show_faulting_vma(regs->ret, buf); /* faulting code, not data */
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2013-01-18 09:42:23 +00:00
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2013-03-22 11:46:49 +00:00
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pr_info("[STAT32]: 0x%08lx", regs->status32);
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#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit : ""
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if (!user_mode(regs))
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pr_cont(" : %2s %2s %2s %2s %2s\n",
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STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1),
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STS_BIT(regs, E2), STS_BIT(regs, E1));
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2013-01-18 09:42:23 +00:00
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2013-03-22 11:46:49 +00:00
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pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
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regs->bta, regs->sp, regs->fp);
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2013-01-18 09:42:23 +00:00
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pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
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regs->lp_start, regs->lp_end, regs->lp_count);
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/* print regs->r0 thru regs->r12
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* Sequential printing was generating horrible code
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*/
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print_reg_file(&(regs->r0), 0);
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/* If Callee regs were saved, display them too */
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cregs = (struct callee_regs *)current->thread.callee_reg;
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if (cregs)
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show_callee_regs(cregs);
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free_page((unsigned long)buf);
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2013-01-18 09:42:21 +00:00
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}
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void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
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2013-06-12 09:43:40 +00:00
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unsigned long address)
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2013-01-18 09:42:21 +00:00
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{
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2013-01-18 09:42:23 +00:00
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current->thread.fault_address = address;
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/* Caller and Callee regs */
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show_regs(regs);
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/* Show stack trace if this Fatality happened in kernel mode */
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if (!user_mode(regs))
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show_stacktrace(current, regs);
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2013-01-18 09:42:21 +00:00
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}
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2013-01-18 09:42:23 +00:00
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#ifdef CONFIG_DEBUG_FS
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/init.h>
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#include <linux/namei.h>
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#include <linux/debugfs.h>
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static struct dentry *test_dentry;
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static struct dentry *test_dir;
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static struct dentry *test_u32_dentry;
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static u32 clr_on_read = 1;
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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u32 numitlb, numdtlb, num_pte_not_present;
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static int fill_display_data(char *kbuf)
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{
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size_t num = 0;
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num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);
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num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);
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num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);
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if (clr_on_read)
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numitlb = numdtlb = num_pte_not_present = 0;
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return num;
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}
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static int tlb_stats_open(struct inode *inode, struct file *file)
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{
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file->private_data = (void *)__get_free_page(GFP_KERNEL);
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return 0;
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}
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/* called on user read(): display the couters */
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static ssize_t tlb_stats_output(struct file *file, /* file descriptor */
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char __user *user_buf, /* user buffer */
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size_t len, /* length of buffer */
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loff_t *offset) /* offset in the file */
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{
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|
|
size_t num;
|
|
|
|
char *kbuf = (char *)file->private_data;
|
|
|
|
|
|
|
|
/* All of the data can he shoved in one iteration */
|
|
|
|
if (*offset != 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
num = fill_display_data(kbuf);
|
|
|
|
|
|
|
|
/* simple_read_from_buffer() is helper for copy to user space
|
|
|
|
It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
|
|
|
|
@3 (offset) into the user space address starting at @1 (user_buf).
|
|
|
|
@5 (len) is max size of user buffer
|
|
|
|
*/
|
|
|
|
return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called on user write : clears the counters */
|
|
|
|
static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
|
|
|
|
size_t length, loff_t *offset)
|
|
|
|
{
|
|
|
|
numitlb = numdtlb = num_pte_not_present = 0;
|
|
|
|
return length;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tlb_stats_close(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
free_page((unsigned long)(file->private_data));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct file_operations tlb_stats_file_ops = {
|
|
|
|
.read = tlb_stats_output,
|
|
|
|
.write = tlb_stats_clear,
|
|
|
|
.open = tlb_stats_open,
|
|
|
|
.release = tlb_stats_close
|
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static int __init arc_debugfs_init(void)
|
|
|
|
{
|
|
|
|
test_dir = debugfs_create_dir("arc", NULL);
|
|
|
|
|
|
|
|
#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
|
|
|
|
test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
|
|
|
|
&tlb_stats_file_ops);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
test_u32_dentry =
|
|
|
|
debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(arc_debugfs_init);
|
|
|
|
|
|
|
|
static void __exit arc_debugfs_exit(void)
|
|
|
|
{
|
|
|
|
debugfs_remove(test_u32_dentry);
|
|
|
|
debugfs_remove(test_dentry);
|
|
|
|
debugfs_remove(test_dir);
|
|
|
|
}
|
|
|
|
module_exit(arc_debugfs_exit);
|
|
|
|
|
|
|
|
#endif
|