335 lines
8.5 KiB
C
335 lines
8.5 KiB
C
/*
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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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#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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/* because pt_regs has regs reversed: r12..r0, r25..r13 */
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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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/* 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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}
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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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pr_info("Path: %s\n", path_nm);
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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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struct mm_struct *active_mm = current->active_mm;
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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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down_read(&active_mm->mmap_sem);
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vma = find_vma(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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inode = file_inode(vma->vm_file);
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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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" 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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pr_info(" @No matching VMA found\n");
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up_read(&active_mm->mmap_sem);
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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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unsigned int vec, cause_code;
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unsigned long address;
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pr_info("\n[ECR ]: 0x%08lx => ", regs->event);
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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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vec = regs->ecr_vec;
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cause_code = regs->ecr_cause;
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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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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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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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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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} 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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void show_regs(struct pt_regs *regs)
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{
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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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show_regs_print_info(KERN_INFO);
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show_ecr_verbose(regs);
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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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if (user_mode(regs))
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show_faulting_vma(regs->ret, buf); /* faulting code, not data */
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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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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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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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}
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void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
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unsigned long address)
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{
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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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}
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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;
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char *kbuf = (char *)file->private_data;
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/* All of the data can he shoved in one iteration */
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if (*offset != 0)
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return 0;
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num = fill_display_data(kbuf);
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/* simple_read_from_buffer() is helper for copy to user space
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It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
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@3 (offset) into the user space address starting at @1 (user_buf).
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@5 (len) is max size of user buffer
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*/
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return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
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}
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/* called on user write : clears the counters */
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static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
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size_t length, loff_t *offset)
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{
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numitlb = numdtlb = num_pte_not_present = 0;
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return length;
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}
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static int tlb_stats_close(struct inode *inode, struct file *file)
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{
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free_page((unsigned long)(file->private_data));
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return 0;
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}
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static const struct file_operations tlb_stats_file_ops = {
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.read = tlb_stats_output,
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.write = tlb_stats_clear,
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.open = tlb_stats_open,
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.release = tlb_stats_close
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};
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#endif
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static int __init arc_debugfs_init(void)
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{
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test_dir = debugfs_create_dir("arc", NULL);
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
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&tlb_stats_file_ops);
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#endif
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test_u32_dentry =
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debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
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return 0;
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}
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module_init(arc_debugfs_init);
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static void __exit arc_debugfs_exit(void)
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{
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debugfs_remove(test_u32_dentry);
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debugfs_remove(test_dentry);
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debugfs_remove(test_dir);
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}
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module_exit(arc_debugfs_exit);
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#endif
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