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hc
2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f 
 kernel/arch/arc/kernel/troubleshoot.c
....@@ -1,8 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * 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
64  */
75 
86 #include <linux/ptrace.h>
....@@ -20,44 +18,37 @@
2018 
2119 #define ARC_PATH_MAX	256
2220 
23
-/*
24
- * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
25
- *   -Prints 3 regs per line and a CR.
26
- *   -To continue, callee regs right after scratch, special handling of CR
27
- */
28
-static noinline void print_reg_file(long *reg_rev, int start_num)
21
+static noinline void print_regs_scratch(struct pt_regs *regs)
2922 {
30
-	unsigned int i;
31
-	char buf[512];
32
-	int n = 0, len = sizeof(buf);
23
+	pr_cont("BTA: 0x%08lx\n SP: 0x%08lx  FP: 0x%08lx BLK: %pS\n",
24
+		regs->bta, regs->sp, regs->fp, (void *)regs->blink);
25
+	pr_cont("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
26
+		regs->lp_start, regs->lp_end, regs->lp_count);
3327 
34
-	for (i = start_num; i < start_num + 13; i++) {
35
-		n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
36
-			       i, (unsigned long)*reg_rev);
37
-
38
-		if (((i + 1) % 3) == 0)
39
-			n += scnprintf(buf + n, len - n, "\n");
40
-
41
-		/* because pt_regs has regs reversed: r12..r0, r25..r13 */
42
-		if (is_isa_arcv2() && start_num == 0)
43
-			reg_rev++;
44
-		else
45
-			reg_rev--;
46
-	}
47
-
48
-	if (start_num != 0)
49
-		n += scnprintf(buf + n, len - n, "\n\n");
50
-
51
-	/* To continue printing callee regs on same line as scratch regs */
52
-	if (start_num == 0)
53
-		pr_info("%s", buf);
54
-	else
55
-		pr_cont("%s\n", buf);
28
+	pr_info("r00: 0x%08lx\tr01: 0x%08lx\tr02: 0x%08lx\n"	\
29
+		"r03: 0x%08lx\tr04: 0x%08lx\tr05: 0x%08lx\n"	\
30
+		"r06: 0x%08lx\tr07: 0x%08lx\tr08: 0x%08lx\n"	\
31
+		"r09: 0x%08lx\tr10: 0x%08lx\tr11: 0x%08lx\n"	\
32
+		"r12: 0x%08lx\t",
33
+		regs->r0, regs->r1, regs->r2,
34
+		regs->r3, regs->r4, regs->r5,
35
+		regs->r6, regs->r7, regs->r8,
36
+		regs->r9, regs->r10, regs->r11,
37
+		regs->r12);
5638 }
5739 
58
-static void show_callee_regs(struct callee_regs *cregs)
40
+static void print_regs_callee(struct callee_regs *regs)
5941 {
60
-	print_reg_file(&(cregs->r13), 13);
42
+	pr_cont("r13: 0x%08lx\tr14: 0x%08lx\n"			\
43
+		"r15: 0x%08lx\tr16: 0x%08lx\tr17: 0x%08lx\n"	\
44
+		"r18: 0x%08lx\tr19: 0x%08lx\tr20: 0x%08lx\n"	\
45
+		"r21: 0x%08lx\tr22: 0x%08lx\tr23: 0x%08lx\n"	\
46
+		"r24: 0x%08lx\tr25: 0x%08lx\n",
47
+		regs->r13, regs->r14,
48
+		regs->r15, regs->r16, regs->r17,
49
+		regs->r18, regs->r19, regs->r20,
50
+		regs->r21, regs->r22, regs->r23,
51
+		regs->r24, regs->r25);
6152 }
6253 
6354 static void print_task_path_n_nm(struct task_struct *tsk)
....@@ -91,7 +82,7 @@
9182 	/* can't use print_vma_addr() yet as it doesn't check for
9283 	 * non-inclusive vma
9384 	 */
94
-	down_read(&active_mm->mmap_sem);
85
+	mmap_read_lock(active_mm);
9586 	vma = find_vma(active_mm, address);
9687 
9788 	/* check against the find_vma( ) behaviour which returns the next VMA
....@@ -106,23 +97,20 @@
10697 			if (IS_ERR(nm))
10798 				nm = "?";
10899 		}
109
-		pr_info("    @off 0x%lx in [%s]\n"
110
-			"    VMA: 0x%08lx to 0x%08lx\n",
100
+		pr_info("  @off 0x%lx in [%s]  VMA: 0x%08lx to 0x%08lx\n",
111101 			vma->vm_start < TASK_UNMAPPED_BASE ?
112102 				address : address - vma->vm_start,
113103 			nm, vma->vm_start, vma->vm_end);
114104 	} else
115105 		pr_info("    @No matching VMA found\n");
116106 
117
-	up_read(&active_mm->mmap_sem);
107
+	mmap_read_unlock(active_mm);
118108 }
119109 
120110 static void show_ecr_verbose(struct pt_regs *regs)
121111 {
122112 	unsigned int vec, cause_code;
123113 	unsigned long address;
124
-
125
-	pr_info("\n[ECR   ]: 0x%08lx => ", regs->event);
126114 
127115 	/* For Data fault, this is data address not instruction addr */
128116 	address = current->thread.fault_address;
....@@ -132,10 +120,10 @@
132120 
133121 	/* For DTLB Miss or ProtV, display the memory involved too */
134122 	if (vec == ECR_V_DTLB_MISS) {
135
-		pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
123
+		pr_cont("Invalid %s @ 0x%08lx by insn @ %pS\n",
136124 		       (cause_code == 0x01) ? "Read" :
137125 		       ((cause_code == 0x02) ? "Write" : "EX"),
138
-		       address, regs->ret);
126
+		       address, (void *)regs->ret);
139127 	} else if (vec == ECR_V_ITLB_MISS) {
140128 		pr_cont("Insn could not be fetched\n");
141129 	} else if (vec == ECR_V_MACH_CHK) {
....@@ -145,7 +133,8 @@
145133 	} else if (vec == ECR_V_PROTV) {
146134 		if (cause_code == ECR_C_PROTV_INST_FETCH)
147135 			pr_cont("Execute from Non-exec Page\n");
148
-		else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
136
+		else if (cause_code == ECR_C_PROTV_MISALIG_DATA &&
137
+		         IS_ENABLED(CONFIG_ISA_ARCOMPACT))
149138 			pr_cont("Misaligned r/w from 0x%08lx\n", address);
150139 		else
151140 			pr_cont("%s access not allowed on page\n",
....@@ -161,6 +150,8 @@
161150 			pr_cont("Bus Error from Data Mem\n");
162151 		else
163152 			pr_cont("Bus Error, check PRM\n");
153
+	} else if (vec == ECR_V_MISALIGN) {
154
+		pr_cont("Misaligned r/w from 0x%08lx\n", address);
164155 #endif
165156 	} else if (vec == ECR_V_TRAP) {
166157 		if (regs->ecr_param == 5)
....@@ -177,7 +168,7 @@
177168 void show_regs(struct pt_regs *regs)
178169 {
179170 	struct task_struct *tsk = current;
180
-	struct callee_regs *cregs;
171
+	struct callee_regs *cregs = (struct callee_regs *)tsk->thread.callee_reg;
181172 
182173 	/*
183174 	 * generic code calls us with preemption disabled, but some calls
....@@ -190,43 +181,31 @@
190181 
191182 	show_ecr_verbose(regs);
192183 
193
-	pr_info("[EFA   ]: 0x%08lx\n[BLINK ]: %pS\n[ERET  ]: %pS\n",
194
-		current->thread.fault_address,
195
-		(void *)regs->blink, (void *)regs->ret);
196
-
197184 	if (user_mode(regs))
198185 		show_faulting_vma(regs->ret); /* faulting code, not data */
199186 
200
-	pr_info("[STAT32]: 0x%08lx", regs->status32);
187
+	pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\nSTAT: 0x%08lx",
188
+		regs->event, current->thread.fault_address, regs->ret,
189
+		regs->status32);
201190 
202191 #define STS_BIT(r, bit)	r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
203192 
204193 #ifdef CONFIG_ISA_ARCOMPACT
205
-	pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n",
194
+	pr_cont(" [%2s%2s%2s%2s%2s%2s%2s]",
206195 			(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
207196 			STS_BIT(regs, DE), STS_BIT(regs, AE),
208197 			STS_BIT(regs, A2), STS_BIT(regs, A1),
209198 			STS_BIT(regs, E2), STS_BIT(regs, E1));
210199 #else
211
-	pr_cont(" : %2s%2s%2s%2s\n",
200
+	pr_cont(" [%2s%2s%2s%2s]   ",
212201 			STS_BIT(regs, IE),
213202 			(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
214203 			STS_BIT(regs, DE), STS_BIT(regs, AE));
215204 #endif
216
-	pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
217
-		regs->bta, regs->sp, regs->fp);
218
-	pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
219
-	       regs->lp_start, regs->lp_end, regs->lp_count);
220205 
221
-	/* print regs->r0 thru regs->r12
222
-	 * Sequential printing was generating horrible code
223
-	 */
224
-	print_reg_file(&(regs->r0), 0);
225
-
226
-	/* If Callee regs were saved, display them too */
227
-	cregs = (struct callee_regs *)current->thread.callee_reg;
206
+	print_regs_scratch(regs);
228207 	if (cregs)
229
-		show_callee_regs(cregs);
208
+		print_regs_callee(cregs);
230209 
231210 	preempt_disable();
232211 }
....@@ -244,5 +223,5 @@
244223 
245224 	/* Show stack trace if this Fatality happened in kernel mode */
246225 	if (!user_mode(regs))
247
-		show_stacktrace(current, regs);
226
+		show_stacktrace(current, regs, KERN_DEFAULT);
248227 }