arch/arc/kernel/troubleshoot.c - linux - Git at Google

 // 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);
 }
	// 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);
	}