[linux-2.6-block.git] / arch / arc / kernel / troubleshoot.c

/*
 * 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>

/*
 * 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;
	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)) {
		if (vma->vm_file) {
			nm = file_path(vma->vm_file, buf, PAGE_SIZE - 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;
	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);
}
Commit	Line	Data
c08098f2 VG	1	/*
	2	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	*/
	7
	8	#include <linux/ptrace.h>
0ef88a54 VG	9	#include <linux/module.h>
	10	#include <linux/mm.h>
	11	#include <linux/fs.h>
	12	#include <linux/kdev_t.h>
0ef88a54 VG	13	#include <linux/proc_fs.h>
0ef88a54 VG	14	#include <linux/file.h>
6e84f315	15	#include <linux/sched/mm.h>
b17b0153	16	#include <linux/sched/debug.h>
6e84f315	17
0ef88a54	18	#include <asm/arcregs.h>
1f6ccfff	19	#include <asm/irqflags.h>
0ef88a54 VG	20
	21	/*
	22	* Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
	23	* -Prints 3 regs per line and a CR.
	24	* -To continue, callee regs right after scratch, special handling of CR
	25	*/
	26	static noinline void print_reg_file(long *reg_rev, int start_num)
	27	{
	28	unsigned int i;
	29	char buf[512];
	30	int n = 0, len = sizeof(buf);
	31
0ef88a54 VG	32	for (i = start_num; i < start_num + 13; i++) {
	33	n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
	34	i, (unsigned long)*reg_rev);
	35
	36	if (((i + 1) % 3) == 0)
	37	n += scnprintf(buf + n, len - n, "\n");
	38
bd3c8b11	39	/* because pt_regs has regs reversed: r12..r0, r25..r13 */
1f6ccfff VG	40	if (is_isa_arcv2() && start_num == 0)
	41	reg_rev++;
	42	else
	43	reg_rev--;
0ef88a54 VG	44	}
	45
	46	if (start_num != 0)
	47	n += scnprintf(buf + n, len - n, "\n\n");
	48
bd3c8b11 VG	49	/* To continue printing callee regs on same line as scratch regs */
	50	if (start_num == 0)
	51	pr_info("%s", buf);
	52	else
	53	pr_cont("%s\n", buf);
0ef88a54 VG	54	}
	55
	56	static void show_callee_regs(struct callee_regs *cregs)
	57	{
	58	print_reg_file(&(cregs->r13), 13);
	59	}
	60
be2a7fce	61	static void print_task_path_n_nm(struct task_struct tsk, char buf)
0ef88a54	62	{
0ef88a54 VG	63	char *path_nm = NULL;
	64	struct mm_struct *mm;
	65	struct file *exe_file;
	66
	67	mm = get_task_mm(tsk);
	68	if (!mm)
	69	goto done;
	70
	71	exe_file = get_mm_exe_file(mm);
	72	mmput(mm);
	73
	74	if (exe_file) {
9bf39ab2	75	path_nm = file_path(exe_file, buf, 255);
0ef88a54	76	fput(exe_file);
0ef88a54 VG	77	}
	78
	79	done:
9bf39ab2	80	pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");
0ef88a54	81	}
0ef88a54 VG	82
	83	static void show_faulting_vma(unsigned long address, char *buf)
	84	{
	85	struct vm_area_struct *vma;
0ef88a54	86	char *nm = buf;
5040573e	87	struct mm_struct *active_mm = current->active_mm;
0ef88a54	88
bd3c8b11 VG	89	/* can't use print_vma_addr() yet as it doesn't check for
	90	* non-inclusive vma
	91	*/
5040573e DB	92	down_read(&active_mm->mmap_sem);
5040573e DB	93	vma = find_vma(active_mm, address);
0ef88a54 VG	94
	95	/* check against the find_vma( ) behaviour which returns the next VMA
	96	* if the container VMA is not found
	97	*/
	98	if (vma && (vma->vm_start <= address)) {
1e3bece2 EP	99	if (vma->vm_file) {
	100	nm = file_path(vma->vm_file, buf, PAGE_SIZE - 1);
	101	if (IS_ERR(nm))
	102	nm = "?";
0ef88a54 VG	103	}
0ef88a54 VG	104	pr_info(" @off 0x%lx in [%s]\n"
bd3c8b11 VG	105	" VMA: 0x%08lx to 0x%08lx\n",
	106	vma->vm_start < TASK_UNMAPPED_BASE ?
	107	address : address - vma->vm_start,
	108	nm, vma->vm_start, vma->vm_end);
5040573e	109	} else
0ef88a54	110	pr_info(" @No matching VMA found\n");
5040573e DB	111
5040573e DB	112	up_read(&active_mm->mmap_sem);
0ef88a54 VG	113	}
	114
	115	static void show_ecr_verbose(struct pt_regs *regs)
	116	{
502a0c77	117	unsigned int vec, cause_code;
0ef88a54 VG	118	unsigned long address;
0ef88a54 VG	119
502a0c77	120	pr_info("\n[ECR ]: 0x%08lx => ", regs->event);
0ef88a54 VG	121
	122	/* For Data fault, this is data address not instruction addr */
	123	address = current->thread.fault_address;
	124
502a0c77 VG	125	vec = regs->ecr_vec;
502a0c77 VG	126	cause_code = regs->ecr_cause;
0ef88a54 VG	127
	128	/* For DTLB Miss or ProtV, display the memory involved too */
	129	if (vec == ECR_V_DTLB_MISS) {
65464152 VG	130	pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
	131	(cause_code == 0x01) ? "Read" :
	132	((cause_code == 0x02) ? "Write" : "EX"),
0ef88a54 VG	133	address, regs->ret);
	134	} else if (vec == ECR_V_ITLB_MISS) {
	135	pr_cont("Insn could not be fetched\n");
	136	} else if (vec == ECR_V_MACH_CHK) {
aa7e3a5e	137	pr_cont("Machine Check (%s)\n", (cause_code == 0x0) ?
0ef88a54 VG	138	"Double Fault" : "Other Fatal Err");
	139
	140	} else if (vec == ECR_V_PROTV) {
	141	if (cause_code == ECR_C_PROTV_INST_FETCH)
	142	pr_cont("Execute from Non-exec Page\n");
0ef88a54 VG	143	else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
0ef88a54 VG	144	pr_cont("Misaligned r/w from 0x%08lx\n", address);
65464152 VG	145	else
	146	pr_cont("%s access not allowed on page\n",
	147	(cause_code == 0x01) ? "Read" :
	148	((cause_code == 0x02) ? "Write" : "EX"));
0ef88a54 VG	149	} else if (vec == ECR_V_INSN_ERR) {
0ef88a54 VG	150	pr_cont("Illegal Insn\n");
1f6ccfff VG	151	#ifdef CONFIG_ISA_ARCV2
	152	} else if (vec == ECR_V_MEM_ERR) {
	153	if (cause_code == 0x00)
	154	pr_cont("Bus Error from Insn Mem\n");
	155	else if (cause_code == 0x10)
	156	pr_cont("Bus Error from Data Mem\n");
	157	else
	158	pr_cont("Bus Error, check PRM\n");
	159	#endif
f5a16b93 VG	160	} else if (vec == ECR_V_TRAP) {
	161	if (regs->ecr_param == 5)
	162	pr_cont("gcc generated __builtin_trap\n");
0ef88a54 VG	163	} else {
	164	pr_cont("Check Programmer's Manual\n");
	165	}
	166	}
	167
	168	/************************************************************************
	169	* API called by rest of kernel
	170	***********************************************************************/
c08098f2 VG	171
	172	void show_regs(struct pt_regs *regs)
	173	{
0ef88a54 VG	174	struct task_struct *tsk = current;
	175	struct callee_regs *cregs;
	176	char *buf;
	177
0ee931c4	178	buf = (char *)__get_free_page(GFP_KERNEL);
0ef88a54 VG	179	if (!buf)
	180	return;
	181
	182	print_task_path_n_nm(tsk, buf);
a43cb95d	183	show_regs_print_info(KERN_INFO);
0ef88a54	184
502a0c77	185	show_ecr_verbose(regs);
0ef88a54	186
bd3c8b11 VG	187	pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n",
	188	current->thread.fault_address,
	189	(void )regs->blink, (void )regs->ret);
0ef88a54	190
bd3c8b11 VG	191	if (user_mode(regs))
bd3c8b11 VG	192	show_faulting_vma(regs->ret, buf); /* faulting code, not data */
0ef88a54	193
bd3c8b11 VG	194	pr_info("[STAT32]: 0x%08lx", regs->status32);
bd3c8b11 VG	195
1f6ccfff	196	#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
0ef88a54	197
1f6ccfff VG	198	#ifdef CONFIG_ISA_ARCOMPACT
	199	pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n",
	200	(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
	201	STS_BIT(regs, DE), STS_BIT(regs, AE),
	202	STS_BIT(regs, A2), STS_BIT(regs, A1),
	203	STS_BIT(regs, E2), STS_BIT(regs, E1));
	204	#else
	205	pr_cont(" : %2s%2s%2s%2s\n",
	206	STS_BIT(regs, IE),
	207	(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
	208	STS_BIT(regs, DE), STS_BIT(regs, AE));
	209	#endif
bd3c8b11 VG	210	pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
bd3c8b11 VG	211	regs->bta, regs->sp, regs->fp);
0ef88a54 VG	212	pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
	213	regs->lp_start, regs->lp_end, regs->lp_count);
	214
	215	/* print regs->r0 thru regs->r12
	216	* Sequential printing was generating horrible code
	217	*/
	218	print_reg_file(&(regs->r0), 0);
	219
	220	/* If Callee regs were saved, display them too */
	221	cregs = (struct callee_regs *)current->thread.callee_reg;
	222	if (cregs)
	223	show_callee_regs(cregs);
	224
	225	free_page((unsigned long)buf);
c08098f2 VG	226	}
	227
	228	void show_kernel_fault_diag(const char str, struct pt_regs regs,
38a9ff6d	229	unsigned long address)
c08098f2	230	{
0ef88a54	231	current->thread.fault_address = address;
0ef88a54	232
aa7e3a5e JA	233	/* Show fault description */
	234	pr_info("\n%s\n", str);
	235
0ef88a54 VG	236	/* Caller and Callee regs */
	237	show_regs(regs);
	238
	239	/* Show stack trace if this Fatality happened in kernel mode */
	240	if (!user_mode(regs))
	241	show_stacktrace(current, regs);
c08098f2	242	}