Commit | Line | Data |
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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> | |
13 | #include <linux/fs_struct.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/file.h> | |
16 | #include <asm/arcregs.h> | |
1f6ccfff | 17 | #include <asm/irqflags.h> |
0ef88a54 VG |
18 | |
19 | /* | |
20 | * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25) | |
21 | * -Prints 3 regs per line and a CR. | |
22 | * -To continue, callee regs right after scratch, special handling of CR | |
23 | */ | |
24 | static noinline void print_reg_file(long *reg_rev, int start_num) | |
25 | { | |
26 | unsigned int i; | |
27 | char buf[512]; | |
28 | int n = 0, len = sizeof(buf); | |
29 | ||
0ef88a54 VG |
30 | for (i = start_num; i < start_num + 13; i++) { |
31 | n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t", | |
32 | i, (unsigned long)*reg_rev); | |
33 | ||
34 | if (((i + 1) % 3) == 0) | |
35 | n += scnprintf(buf + n, len - n, "\n"); | |
36 | ||
bd3c8b11 | 37 | /* because pt_regs has regs reversed: r12..r0, r25..r13 */ |
1f6ccfff VG |
38 | if (is_isa_arcv2() && start_num == 0) |
39 | reg_rev++; | |
40 | else | |
41 | reg_rev--; | |
0ef88a54 VG |
42 | } |
43 | ||
44 | if (start_num != 0) | |
45 | n += scnprintf(buf + n, len - n, "\n\n"); | |
46 | ||
bd3c8b11 VG |
47 | /* To continue printing callee regs on same line as scratch regs */ |
48 | if (start_num == 0) | |
49 | pr_info("%s", buf); | |
50 | else | |
51 | pr_cont("%s\n", buf); | |
0ef88a54 VG |
52 | } |
53 | ||
54 | static void show_callee_regs(struct callee_regs *cregs) | |
55 | { | |
56 | print_reg_file(&(cregs->r13), 13); | |
57 | } | |
58 | ||
be2a7fce | 59 | static void print_task_path_n_nm(struct task_struct *tsk, char *buf) |
0ef88a54 | 60 | { |
0ef88a54 VG |
61 | char *path_nm = NULL; |
62 | struct mm_struct *mm; | |
63 | struct file *exe_file; | |
64 | ||
65 | mm = get_task_mm(tsk); | |
66 | if (!mm) | |
67 | goto done; | |
68 | ||
69 | exe_file = get_mm_exe_file(mm); | |
70 | mmput(mm); | |
71 | ||
72 | if (exe_file) { | |
9bf39ab2 | 73 | path_nm = file_path(exe_file, buf, 255); |
0ef88a54 | 74 | fput(exe_file); |
0ef88a54 VG |
75 | } |
76 | ||
77 | done: | |
9bf39ab2 | 78 | pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?"); |
0ef88a54 | 79 | } |
0ef88a54 VG |
80 | |
81 | static void show_faulting_vma(unsigned long address, char *buf) | |
82 | { | |
83 | struct vm_area_struct *vma; | |
84 | struct inode *inode; | |
85 | unsigned long ino = 0; | |
86 | dev_t dev = 0; | |
87 | char *nm = buf; | |
5040573e | 88 | struct mm_struct *active_mm = current->active_mm; |
0ef88a54 | 89 | |
bd3c8b11 VG |
90 | /* can't use print_vma_addr() yet as it doesn't check for |
91 | * non-inclusive vma | |
92 | */ | |
5040573e DB |
93 | down_read(&active_mm->mmap_sem); |
94 | vma = find_vma(active_mm, address); | |
0ef88a54 VG |
95 | |
96 | /* check against the find_vma( ) behaviour which returns the next VMA | |
97 | * if the container VMA is not found | |
98 | */ | |
99 | if (vma && (vma->vm_start <= address)) { | |
100 | struct file *file = vma->vm_file; | |
101 | if (file) { | |
9bf39ab2 | 102 | nm = file_path(file, buf, PAGE_SIZE - 1); |
e77e4300 | 103 | inode = file_inode(vma->vm_file); |
0ef88a54 VG |
104 | dev = inode->i_sb->s_dev; |
105 | ino = inode->i_ino; | |
106 | } | |
107 | pr_info(" @off 0x%lx in [%s]\n" | |
bd3c8b11 VG |
108 | " VMA: 0x%08lx to 0x%08lx\n", |
109 | vma->vm_start < TASK_UNMAPPED_BASE ? | |
110 | address : address - vma->vm_start, | |
111 | nm, vma->vm_start, vma->vm_end); | |
5040573e | 112 | } else |
0ef88a54 | 113 | pr_info(" @No matching VMA found\n"); |
5040573e DB |
114 | |
115 | up_read(&active_mm->mmap_sem); | |
0ef88a54 VG |
116 | } |
117 | ||
118 | static void show_ecr_verbose(struct pt_regs *regs) | |
119 | { | |
502a0c77 | 120 | unsigned int vec, cause_code; |
0ef88a54 VG |
121 | unsigned long address; |
122 | ||
502a0c77 | 123 | pr_info("\n[ECR ]: 0x%08lx => ", regs->event); |
0ef88a54 VG |
124 | |
125 | /* For Data fault, this is data address not instruction addr */ | |
126 | address = current->thread.fault_address; | |
127 | ||
502a0c77 VG |
128 | vec = regs->ecr_vec; |
129 | cause_code = regs->ecr_cause; | |
0ef88a54 VG |
130 | |
131 | /* For DTLB Miss or ProtV, display the memory involved too */ | |
132 | if (vec == ECR_V_DTLB_MISS) { | |
65464152 VG |
133 | pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n", |
134 | (cause_code == 0x01) ? "Read" : | |
135 | ((cause_code == 0x02) ? "Write" : "EX"), | |
0ef88a54 VG |
136 | address, regs->ret); |
137 | } else if (vec == ECR_V_ITLB_MISS) { | |
138 | pr_cont("Insn could not be fetched\n"); | |
139 | } else if (vec == ECR_V_MACH_CHK) { | |
140 | pr_cont("%s\n", (cause_code == 0x0) ? | |
141 | "Double Fault" : "Other Fatal Err"); | |
142 | ||
143 | } else if (vec == ECR_V_PROTV) { | |
144 | if (cause_code == ECR_C_PROTV_INST_FETCH) | |
145 | pr_cont("Execute from Non-exec Page\n"); | |
0ef88a54 VG |
146 | else if (cause_code == ECR_C_PROTV_MISALIG_DATA) |
147 | pr_cont("Misaligned r/w from 0x%08lx\n", address); | |
65464152 VG |
148 | else |
149 | pr_cont("%s access not allowed on page\n", | |
150 | (cause_code == 0x01) ? "Read" : | |
151 | ((cause_code == 0x02) ? "Write" : "EX")); | |
0ef88a54 VG |
152 | } else if (vec == ECR_V_INSN_ERR) { |
153 | pr_cont("Illegal Insn\n"); | |
1f6ccfff VG |
154 | #ifdef CONFIG_ISA_ARCV2 |
155 | } else if (vec == ECR_V_MEM_ERR) { | |
156 | if (cause_code == 0x00) | |
157 | pr_cont("Bus Error from Insn Mem\n"); | |
158 | else if (cause_code == 0x10) | |
159 | pr_cont("Bus Error from Data Mem\n"); | |
160 | else | |
161 | pr_cont("Bus Error, check PRM\n"); | |
162 | #endif | |
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 | ||
178 | buf = (char *)__get_free_page(GFP_TEMPORARY); | |
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)) |
192 | show_faulting_vma(regs->ret, buf); /* faulting code, not data */ | |
0ef88a54 | 193 | |
bd3c8b11 VG |
194 | pr_info("[STAT32]: 0x%08lx", regs->status32); |
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", |
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 VG |
232 | |
233 | /* Caller and Callee regs */ | |
234 | show_regs(regs); | |
235 | ||
236 | /* Show stack trace if this Fatality happened in kernel mode */ | |
237 | if (!user_mode(regs)) | |
238 | show_stacktrace(current, regs); | |
c08098f2 | 239 | } |
0ef88a54 VG |
240 | |
241 | #ifdef CONFIG_DEBUG_FS | |
242 | ||
243 | #include <linux/module.h> | |
244 | #include <linux/fs.h> | |
245 | #include <linux/mount.h> | |
246 | #include <linux/pagemap.h> | |
247 | #include <linux/init.h> | |
248 | #include <linux/namei.h> | |
249 | #include <linux/debugfs.h> | |
250 | ||
251 | static struct dentry *test_dentry; | |
252 | static struct dentry *test_dir; | |
253 | static struct dentry *test_u32_dentry; | |
254 | ||
255 | static u32 clr_on_read = 1; | |
256 | ||
257 | #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT | |
258 | u32 numitlb, numdtlb, num_pte_not_present; | |
259 | ||
260 | static int fill_display_data(char *kbuf) | |
261 | { | |
262 | size_t num = 0; | |
263 | num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb); | |
264 | num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb); | |
265 | num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present); | |
266 | ||
267 | if (clr_on_read) | |
268 | numitlb = numdtlb = num_pte_not_present = 0; | |
269 | ||
270 | return num; | |
271 | } | |
272 | ||
273 | static int tlb_stats_open(struct inode *inode, struct file *file) | |
274 | { | |
275 | file->private_data = (void *)__get_free_page(GFP_KERNEL); | |
276 | return 0; | |
277 | } | |
278 | ||
2547476a | 279 | /* called on user read(): display the counters */ |
0ef88a54 VG |
280 | static ssize_t tlb_stats_output(struct file *file, /* file descriptor */ |
281 | char __user *user_buf, /* user buffer */ | |
282 | size_t len, /* length of buffer */ | |
283 | loff_t *offset) /* offset in the file */ | |
284 | { | |
285 | size_t num; | |
286 | char *kbuf = (char *)file->private_data; | |
287 | ||
288 | /* All of the data can he shoved in one iteration */ | |
289 | if (*offset != 0) | |
290 | return 0; | |
291 | ||
292 | num = fill_display_data(kbuf); | |
293 | ||
294 | /* simple_read_from_buffer() is helper for copy to user space | |
295 | It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset | |
296 | @3 (offset) into the user space address starting at @1 (user_buf). | |
297 | @5 (len) is max size of user buffer | |
298 | */ | |
299 | return simple_read_from_buffer(user_buf, num, offset, kbuf, len); | |
300 | } | |
301 | ||
302 | /* called on user write : clears the counters */ | |
303 | static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf, | |
304 | size_t length, loff_t *offset) | |
305 | { | |
306 | numitlb = numdtlb = num_pte_not_present = 0; | |
307 | return length; | |
308 | } | |
309 | ||
310 | static int tlb_stats_close(struct inode *inode, struct file *file) | |
311 | { | |
312 | free_page((unsigned long)(file->private_data)); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static const struct file_operations tlb_stats_file_ops = { | |
317 | .read = tlb_stats_output, | |
318 | .write = tlb_stats_clear, | |
319 | .open = tlb_stats_open, | |
320 | .release = tlb_stats_close | |
321 | }; | |
322 | #endif | |
323 | ||
324 | static int __init arc_debugfs_init(void) | |
325 | { | |
326 | test_dir = debugfs_create_dir("arc", NULL); | |
327 | ||
328 | #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT | |
329 | test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL, | |
330 | &tlb_stats_file_ops); | |
331 | #endif | |
332 | ||
333 | test_u32_dentry = | |
334 | debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | module_init(arc_debugfs_init); | |
340 | ||
341 | static void __exit arc_debugfs_exit(void) | |
342 | { | |
343 | debugfs_remove(test_u32_dentry); | |
344 | debugfs_remove(test_dentry); | |
345 | debugfs_remove(test_dir); | |
346 | } | |
347 | module_exit(arc_debugfs_exit); | |
348 | ||
349 | #endif |