diff options
Diffstat (limited to 'arch/arc/kernel/troubleshoot.c')
| -rw-r--r-- | arch/arc/kernel/troubleshoot.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c new file mode 100644 index 000000000..a331bb5d8 --- /dev/null +++ b/arch/arc/kernel/troubleshoot.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + */ + +#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 + +static noinline void print_regs_scratch(struct pt_regs *regs) +{ + pr_cont("BTA: 0x%08lx\n SP: 0x%08lx FP: 0x%08lx BLK: %pS\n", + regs->bta, regs->sp, regs->fp, (void *)regs->blink); + pr_cont("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", + regs->lp_start, regs->lp_end, regs->lp_count); + + pr_info("r00: 0x%08lx\tr01: 0x%08lx\tr02: 0x%08lx\n" \ + "r03: 0x%08lx\tr04: 0x%08lx\tr05: 0x%08lx\n" \ + "r06: 0x%08lx\tr07: 0x%08lx\tr08: 0x%08lx\n" \ + "r09: 0x%08lx\tr10: 0x%08lx\tr11: 0x%08lx\n" \ + "r12: 0x%08lx\t", + regs->r0, regs->r1, regs->r2, + regs->r3, regs->r4, regs->r5, + regs->r6, regs->r7, regs->r8, + regs->r9, regs->r10, regs->r11, + regs->r12); +} + +static void print_regs_callee(struct callee_regs *regs) +{ + pr_cont("r13: 0x%08lx\tr14: 0x%08lx\n" \ + "r15: 0x%08lx\tr16: 0x%08lx\tr17: 0x%08lx\n" \ + "r18: 0x%08lx\tr19: 0x%08lx\tr20: 0x%08lx\n" \ + "r21: 0x%08lx\tr22: 0x%08lx\tr23: 0x%08lx\n" \ + "r24: 0x%08lx\tr25: 0x%08lx\n", + regs->r13, regs->r14, + regs->r15, regs->r16, regs->r17, + regs->r18, regs->r19, regs->r20, + regs->r21, regs->r22, regs->r23, + regs->r24, regs->r25); +} + +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 + */ + mmap_read_lock(active_mm); + 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] 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"); + + mmap_read_unlock(active_mm); +} + +static void show_ecr_verbose(struct pt_regs *regs) +{ + unsigned int vec, cause_code; + unsigned long address; + + /* 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 @ %pS\n", + (cause_code == 0x01) ? "Read" : + ((cause_code == 0x02) ? "Write" : "EX"), + address, (void *)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 && + IS_ENABLED(CONFIG_ISA_ARCOMPACT)) + 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"); + } else if (vec == ECR_V_MISALIGN) { + pr_cont("Misaligned r/w from 0x%08lx\n", address); +#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 = (struct callee_regs *)tsk->thread.callee_reg; + + /* + * 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); + + if (user_mode(regs)) + show_faulting_vma(regs->ret); /* faulting code, not data */ + + pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\nSTAT: 0x%08lx", + regs->event, current->thread.fault_address, regs->ret, + 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]", + (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] ", + STS_BIT(regs, IE), + (regs->status32 & STATUS_U_MASK) ? "U " : "K ", + STS_BIT(regs, DE), STS_BIT(regs, AE)); +#endif + + print_regs_scratch(regs); + if (cregs) + print_regs_callee(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, KERN_DEFAULT); +} |