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troubleshoot.c
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/* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as */ #include <linux/ptrace.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/kdev_t.h> #include <linux/fs_struct.h> #include <linux/proc_fs.h> #include <linux/file.h> #include <linux/sched/mm.h> #include <linux/sched/debug.h> #include <asm/arcregs.h> #include <asm/irqflags.h> /* * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25) * -Prints 3 regs per line and a CR. * -To continue, callee regs right after scratch, special handling of CR */ static noinline void print_reg_file(long *reg_rev, int start_num) { unsigned int i; char buf[512]; int n = 0, len = sizeof(buf); for (i = start_num; i < start_num + 13; i++) { n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t", i, (unsigned long)*reg_rev); if (((i + 1) % 3) == 0) n += scnprintf(buf + n, len - n, "\n"); /* because pt_regs has regs reversed: r12..r0, r25..r13 */ if (is_isa_arcv2() && start_num == 0) reg_rev++; else reg_rev--; } if (start_num != 0) n += scnprintf(buf + n, len - n, "\n\n"); /* To continue printing callee regs on same line as scratch regs */ if (start_num == 0) pr_info("%s", buf); else pr_cont("%s\n", buf); } static void show_callee_regs(struct callee_regs *cregs) { print_reg_file(&(cregs->r13), 13); } static void print_task_path_n_nm(struct task_struct *tsk, char *buf) { char *path_nm = NULL; struct mm_struct *mm; struct file *exe_file; mm = get_task_mm(tsk); if (!mm) goto done; exe_file = get_mm_exe_file(mm); mmput(mm); if (exe_file) { path_nm = file_path(exe_file, buf, 255); fput(exe_file); } done: pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?"); } static void show_faulting_vma(unsigned long address, char *buf) { struct vm_area_struct *vma; struct inode *inode; unsigned long ino = 0; dev_t dev = 0; char *nm = buf; struct mm_struct *active_mm = current->active_mm; /* can't use print_vma_addr() yet as it doesn't check for * non-inclusive vma */ down_read(&active_mm->mmap_sem); vma = find_vma(active_mm, address); /* check against the find_vma( ) behaviour which returns the next VMA * if the container VMA is not found */ if (vma && (vma->vm_start <= address)) { struct file *file = vma->vm_file; if (file) { nm = file_path(file, buf, PAGE_SIZE - 1); inode = file_inode(vma->vm_file); dev = inode->i_sb->s_dev; ino = inode->i_ino; } pr_info(" @off 0x%lx in [%s]\n" " VMA: 0x%08lx to 0x%08lx\n", vma->vm_start < TASK_UNMAPPED_BASE ? address : address - vma->vm_start, nm, vma->vm_start, vma->vm_end); } else pr_info(" @No matching VMA found\n"); up_read(&active_mm->mmap_sem); } static void show_ecr_verbose(struct pt_regs *regs) { unsigned int vec, cause_code; unsigned long address; pr_info("\n[ECR ]: 0x%08lx => ", regs->event); /* For Data fault, this is data address not instruction addr */ address = current->thread.fault_address; vec = regs->ecr_vec; cause_code = regs->ecr_cause; /* For DTLB Miss or ProtV, display the memory involved too */ if (vec == ECR_V_DTLB_MISS) { pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n", (cause_code == 0x01) ? "Read" : ((cause_code == 0x02) ? "Write" : "EX"), address, regs->ret); } else if (vec == ECR_V_ITLB_MISS) { pr_cont("Insn could not be fetched\n"); } else if (vec == ECR_V_MACH_CHK) { pr_cont("Machine Check (%s)\n", (cause_code == 0x0) ? "Double Fault" : "Other Fatal Err"); } else if (vec == ECR_V_PROTV) { if (cause_code == ECR_C_PROTV_INST_FETCH) pr_cont("Execute from Non-exec Page\n"); else if (cause_code == ECR_C_PROTV_MISALIG_DATA) pr_cont("Misaligned r/w from 0x%08lx\n", address); else pr_cont("%s access not allowed on page\n", (cause_code == 0x01) ? "Read" : ((cause_code == 0x02) ? "Write" : "EX")); } else if (vec == ECR_V_INSN_ERR) { pr_cont("Illegal Insn\n"); #ifdef CONFIG_ISA_ARCV2 } else if (vec == ECR_V_MEM_ERR) { if (cause_code == 0x00) pr_cont("Bus Error from Insn Mem\n"); else if (cause_code == 0x10) pr_cont("Bus Error from Data Mem\n"); else pr_cont("Bus Error, check PRM\n"); #endif } else if (vec == ECR_V_TRAP) { if (regs->ecr_param == 5) pr_cont("gcc generated __builtin_trap\n"); } else { pr_cont("Check Programmer's Manual\n"); } } /************************************************************************ * API called by rest of kernel ***********************************************************************/ void show_regs(struct pt_regs *regs) { struct task_struct *tsk = current; struct callee_regs *cregs; char *buf; buf = (char *)__get_free_page(GFP_KERNEL); if (!buf) return; print_task_path_n_nm(tsk, buf); show_regs_print_info(KERN_INFO); show_ecr_verbose(regs); pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n", current->thread.fault_address, (void *)regs->blink, (void *)regs->ret); if (user_mode(regs)) show_faulting_vma(regs->ret, buf); /* faulting code, not data */ pr_info("[STAT32]: 0x%08lx", regs->status32); #define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : "" #ifdef CONFIG_ISA_ARCOMPACT pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n", (regs->status32 & STATUS_U_MASK) ? "U " : "K ", STS_BIT(regs, DE), STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1), STS_BIT(regs, E2), STS_BIT(regs, E1)); #else pr_cont(" : %2s%2s%2s%2s\n", STS_BIT(regs, IE), (regs->status32 & STATUS_U_MASK) ? "U " : "K ", STS_BIT(regs, DE), STS_BIT(regs, AE)); #endif pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n", regs->bta, regs->sp, regs->fp); pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", regs->lp_start, regs->lp_end, regs->lp_count); /* print regs->r0 thru regs->r12 * Sequential printing was generating horrible code */ print_reg_file(&(regs->r0), 0); /* If Callee regs were saved, display them too */ cregs = (struct callee_regs *)current->thread.callee_reg; if (cregs) show_callee_regs(cregs); free_page((unsigned long)buf); } void show_kernel_fault_diag(const char *str, struct pt_regs *regs, unsigned long address) { current->thread.fault_address = address; /* Show fault description */ pr_info("\n%s\n", str); /* Caller and Callee regs */ show_regs(regs); /* Show stack trace if this Fatality happened in kernel mode */ if (!user_mode(regs)) show_stacktrace(current, regs); }
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