diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arc/kernel/troubleshoot.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c new file mode 100644 index 000000000..215f51544 --- /dev/null +++ b/arch/arc/kernel/troubleshoot.c @@ -0,0 +1,248 @@ +/* + * 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/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> + +#define ARC_PATH_MAX 256 + +/* + * 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 *path_nm = NULL; + struct mm_struct *mm; + struct file *exe_file; + char buf[ARC_PATH_MAX]; + + 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, ARC_PATH_MAX-1); + fput(exe_file); + } + +done: + pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?"); +} + +static void show_faulting_vma(unsigned long address) +{ + struct vm_area_struct *vma; + 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)) { + char buf[ARC_PATH_MAX]; + char *nm = "?"; + + if (vma->vm_file) { + nm = file_path(vma->vm_file, buf, ARC_PATH_MAX-1); + if (IS_ERR(nm)) + nm = "?"; + } + 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; + + /* + * generic code calls us with preemption disabled, but some calls + * here could sleep, so re-enable to avoid lockdep splat + */ + preempt_enable(); + + print_task_path_n_nm(tsk); + 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); /* 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); + + preempt_disable(); +} + +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); +} |