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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> | |
17 | ||
18 | /* | |
19 | * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25) | |
20 | * -Prints 3 regs per line and a CR. | |
21 | * -To continue, callee regs right after scratch, special handling of CR | |
22 | */ | |
23 | static noinline void print_reg_file(long *reg_rev, int start_num) | |
24 | { | |
25 | unsigned int i; | |
26 | char buf[512]; | |
27 | int n = 0, len = sizeof(buf); | |
28 | ||
29 | /* weird loop because pt_regs regs rev r12..r0, r25..r13 */ | |
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 | ||
37 | reg_rev--; | |
38 | } | |
39 | ||
40 | if (start_num != 0) | |
41 | n += scnprintf(buf + n, len - n, "\n\n"); | |
42 | ||
43 | pr_info("%s", buf); | |
44 | } | |
45 | ||
46 | static void show_callee_regs(struct callee_regs *cregs) | |
47 | { | |
48 | print_reg_file(&(cregs->r13), 13); | |
49 | } | |
50 | ||
51 | void print_task_path_n_nm(struct task_struct *tsk, char *buf) | |
52 | { | |
53 | struct path path; | |
54 | char *path_nm = NULL; | |
55 | struct mm_struct *mm; | |
56 | struct file *exe_file; | |
57 | ||
58 | mm = get_task_mm(tsk); | |
59 | if (!mm) | |
60 | goto done; | |
61 | ||
62 | exe_file = get_mm_exe_file(mm); | |
63 | mmput(mm); | |
64 | ||
65 | if (exe_file) { | |
66 | path = exe_file->f_path; | |
67 | path_get(&exe_file->f_path); | |
68 | fput(exe_file); | |
69 | path_nm = d_path(&path, buf, 255); | |
70 | path_put(&path); | |
71 | } | |
72 | ||
73 | done: | |
74 | pr_info("%s, TGID %u\n", path_nm, tsk->tgid); | |
75 | } | |
76 | EXPORT_SYMBOL(print_task_path_n_nm); | |
77 | ||
78 | static void show_faulting_vma(unsigned long address, char *buf) | |
79 | { | |
80 | struct vm_area_struct *vma; | |
81 | struct inode *inode; | |
82 | unsigned long ino = 0; | |
83 | dev_t dev = 0; | |
84 | char *nm = buf; | |
85 | ||
86 | vma = find_vma(current->active_mm, address); | |
87 | ||
88 | /* check against the find_vma( ) behaviour which returns the next VMA | |
89 | * if the container VMA is not found | |
90 | */ | |
91 | if (vma && (vma->vm_start <= address)) { | |
92 | struct file *file = vma->vm_file; | |
93 | if (file) { | |
94 | struct path *path = &file->f_path; | |
95 | nm = d_path(path, buf, PAGE_SIZE - 1); | |
96 | inode = vma->vm_file->f_path.dentry->d_inode; | |
97 | dev = inode->i_sb->s_dev; | |
98 | ino = inode->i_ino; | |
99 | } | |
100 | pr_info(" @off 0x%lx in [%s]\n" | |
101 | " VMA: 0x%08lx to 0x%08lx\n\n", | |
102 | address - vma->vm_start, nm, vma->vm_start, vma->vm_end); | |
103 | } else | |
104 | pr_info(" @No matching VMA found\n"); | |
105 | } | |
106 | ||
107 | static void show_ecr_verbose(struct pt_regs *regs) | |
108 | { | |
109 | unsigned int vec, cause_code, cause_reg; | |
110 | unsigned long address; | |
111 | ||
112 | cause_reg = current->thread.cause_code; | |
113 | pr_info("\n[ECR]: 0x%08x => ", cause_reg); | |
114 | ||
115 | /* For Data fault, this is data address not instruction addr */ | |
116 | address = current->thread.fault_address; | |
117 | ||
118 | vec = cause_reg >> 16; | |
119 | cause_code = (cause_reg >> 8) & 0xFF; | |
120 | ||
121 | /* For DTLB Miss or ProtV, display the memory involved too */ | |
122 | if (vec == ECR_V_DTLB_MISS) { | |
123 | pr_cont("Invalid (%s) @ 0x%08lx by insn @ 0x%08lx\n", | |
124 | (cause_code == 0x01) ? "Read From" : | |
125 | ((cause_code == 0x02) ? "Write to" : "EX"), | |
126 | address, regs->ret); | |
127 | } else if (vec == ECR_V_ITLB_MISS) { | |
128 | pr_cont("Insn could not be fetched\n"); | |
129 | } else if (vec == ECR_V_MACH_CHK) { | |
130 | pr_cont("%s\n", (cause_code == 0x0) ? | |
131 | "Double Fault" : "Other Fatal Err"); | |
132 | ||
133 | } else if (vec == ECR_V_PROTV) { | |
134 | if (cause_code == ECR_C_PROTV_INST_FETCH) | |
135 | pr_cont("Execute from Non-exec Page\n"); | |
136 | else if (cause_code == ECR_C_PROTV_LOAD) | |
137 | pr_cont("Read from Non-readable Page\n"); | |
138 | else if (cause_code == ECR_C_PROTV_STORE) | |
139 | pr_cont("Write to Non-writable Page\n"); | |
140 | else if (cause_code == ECR_C_PROTV_XCHG) | |
141 | pr_cont("Data exchange protection violation\n"); | |
142 | else if (cause_code == ECR_C_PROTV_MISALIG_DATA) | |
143 | pr_cont("Misaligned r/w from 0x%08lx\n", address); | |
144 | } else if (vec == ECR_V_INSN_ERR) { | |
145 | pr_cont("Illegal Insn\n"); | |
146 | } else { | |
147 | pr_cont("Check Programmer's Manual\n"); | |
148 | } | |
149 | } | |
150 | ||
151 | /************************************************************************ | |
152 | * API called by rest of kernel | |
153 | ***********************************************************************/ | |
c08098f2 VG |
154 | |
155 | void show_regs(struct pt_regs *regs) | |
156 | { | |
0ef88a54 VG |
157 | struct task_struct *tsk = current; |
158 | struct callee_regs *cregs; | |
159 | char *buf; | |
160 | ||
161 | buf = (char *)__get_free_page(GFP_TEMPORARY); | |
162 | if (!buf) | |
163 | return; | |
164 | ||
165 | print_task_path_n_nm(tsk, buf); | |
a43cb95d | 166 | show_regs_print_info(KERN_INFO); |
0ef88a54 VG |
167 | |
168 | if (current->thread.cause_code) | |
169 | show_ecr_verbose(regs); | |
170 | ||
171 | pr_info("[EFA]: 0x%08lx\n", current->thread.fault_address); | |
172 | pr_info("[ERET]: 0x%08lx (PC of Faulting Instr)\n", regs->ret); | |
173 | ||
174 | show_faulting_vma(regs->ret, buf); /* faulting code, not data */ | |
175 | ||
176 | /* can't use print_vma_addr() yet as it doesn't check for | |
177 | * non-inclusive vma | |
178 | */ | |
179 | ||
180 | /* print special regs */ | |
181 | pr_info("status32: 0x%08lx\n", regs->status32); | |
182 | pr_info(" SP: 0x%08lx\tFP: 0x%08lx\n", regs->sp, regs->fp); | |
183 | pr_info("BTA: 0x%08lx\tBLINK: 0x%08lx\n", | |
184 | regs->bta, regs->blink); | |
185 | pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", | |
186 | regs->lp_start, regs->lp_end, regs->lp_count); | |
187 | ||
188 | /* print regs->r0 thru regs->r12 | |
189 | * Sequential printing was generating horrible code | |
190 | */ | |
191 | print_reg_file(&(regs->r0), 0); | |
192 | ||
193 | /* If Callee regs were saved, display them too */ | |
194 | cregs = (struct callee_regs *)current->thread.callee_reg; | |
195 | if (cregs) | |
196 | show_callee_regs(cregs); | |
197 | ||
198 | free_page((unsigned long)buf); | |
c08098f2 VG |
199 | } |
200 | ||
201 | void show_kernel_fault_diag(const char *str, struct pt_regs *regs, | |
202 | unsigned long address, unsigned long cause_reg) | |
203 | { | |
0ef88a54 VG |
204 | current->thread.fault_address = address; |
205 | current->thread.cause_code = cause_reg; | |
206 | ||
207 | /* Caller and Callee regs */ | |
208 | show_regs(regs); | |
209 | ||
210 | /* Show stack trace if this Fatality happened in kernel mode */ | |
211 | if (!user_mode(regs)) | |
212 | show_stacktrace(current, regs); | |
c08098f2 | 213 | } |
0ef88a54 VG |
214 | |
215 | #ifdef CONFIG_DEBUG_FS | |
216 | ||
217 | #include <linux/module.h> | |
218 | #include <linux/fs.h> | |
219 | #include <linux/mount.h> | |
220 | #include <linux/pagemap.h> | |
221 | #include <linux/init.h> | |
222 | #include <linux/namei.h> | |
223 | #include <linux/debugfs.h> | |
224 | ||
225 | static struct dentry *test_dentry; | |
226 | static struct dentry *test_dir; | |
227 | static struct dentry *test_u32_dentry; | |
228 | ||
229 | static u32 clr_on_read = 1; | |
230 | ||
231 | #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT | |
232 | u32 numitlb, numdtlb, num_pte_not_present; | |
233 | ||
234 | static int fill_display_data(char *kbuf) | |
235 | { | |
236 | size_t num = 0; | |
237 | num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb); | |
238 | num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb); | |
239 | num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present); | |
240 | ||
241 | if (clr_on_read) | |
242 | numitlb = numdtlb = num_pte_not_present = 0; | |
243 | ||
244 | return num; | |
245 | } | |
246 | ||
247 | static int tlb_stats_open(struct inode *inode, struct file *file) | |
248 | { | |
249 | file->private_data = (void *)__get_free_page(GFP_KERNEL); | |
250 | return 0; | |
251 | } | |
252 | ||
253 | /* called on user read(): display the couters */ | |
254 | static ssize_t tlb_stats_output(struct file *file, /* file descriptor */ | |
255 | char __user *user_buf, /* user buffer */ | |
256 | size_t len, /* length of buffer */ | |
257 | loff_t *offset) /* offset in the file */ | |
258 | { | |
259 | size_t num; | |
260 | char *kbuf = (char *)file->private_data; | |
261 | ||
262 | /* All of the data can he shoved in one iteration */ | |
263 | if (*offset != 0) | |
264 | return 0; | |
265 | ||
266 | num = fill_display_data(kbuf); | |
267 | ||
268 | /* simple_read_from_buffer() is helper for copy to user space | |
269 | It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset | |
270 | @3 (offset) into the user space address starting at @1 (user_buf). | |
271 | @5 (len) is max size of user buffer | |
272 | */ | |
273 | return simple_read_from_buffer(user_buf, num, offset, kbuf, len); | |
274 | } | |
275 | ||
276 | /* called on user write : clears the counters */ | |
277 | static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf, | |
278 | size_t length, loff_t *offset) | |
279 | { | |
280 | numitlb = numdtlb = num_pte_not_present = 0; | |
281 | return length; | |
282 | } | |
283 | ||
284 | static int tlb_stats_close(struct inode *inode, struct file *file) | |
285 | { | |
286 | free_page((unsigned long)(file->private_data)); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static const struct file_operations tlb_stats_file_ops = { | |
291 | .read = tlb_stats_output, | |
292 | .write = tlb_stats_clear, | |
293 | .open = tlb_stats_open, | |
294 | .release = tlb_stats_close | |
295 | }; | |
296 | #endif | |
297 | ||
298 | static int __init arc_debugfs_init(void) | |
299 | { | |
300 | test_dir = debugfs_create_dir("arc", NULL); | |
301 | ||
302 | #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT | |
303 | test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL, | |
304 | &tlb_stats_file_ops); | |
305 | #endif | |
306 | ||
307 | test_u32_dentry = | |
308 | debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | module_init(arc_debugfs_init); | |
314 | ||
315 | static void __exit arc_debugfs_exit(void) | |
316 | { | |
317 | debugfs_remove(test_u32_dentry); | |
318 | debugfs_remove(test_dentry); | |
319 | debugfs_remove(test_dir); | |
320 | } | |
321 | module_exit(arc_debugfs_exit); | |
322 | ||
323 | #endif |