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Linux/arch/arc/kernel/troubleshoot.c

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  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>
  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         for (i = start_num; i < start_num + 13; i++) {
 30                 n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
 31                                i, (unsigned long)*reg_rev);
 32 
 33                 if (((i + 1) % 3) == 0)
 34                         n += scnprintf(buf + n, len - n, "\n");
 35 
 36                 /* because pt_regs has regs reversed: r12..r0, r25..r13 */
 37                 reg_rev--;
 38         }
 39 
 40         if (start_num != 0)
 41                 n += scnprintf(buf + n, len - n, "\n\n");
 42 
 43         /* To continue printing callee regs on same line as scratch regs */
 44         if (start_num == 0)
 45                 pr_info("%s", buf);
 46         else
 47                 pr_cont("%s\n", buf);
 48 }
 49 
 50 static void show_callee_regs(struct callee_regs *cregs)
 51 {
 52         print_reg_file(&(cregs->r13), 13);
 53 }
 54 
 55 void print_task_path_n_nm(struct task_struct *tsk, char *buf)
 56 {
 57         struct path path;
 58         char *path_nm = NULL;
 59         struct mm_struct *mm;
 60         struct file *exe_file;
 61 
 62         mm = get_task_mm(tsk);
 63         if (!mm)
 64                 goto done;
 65 
 66         exe_file = get_mm_exe_file(mm);
 67         mmput(mm);
 68 
 69         if (exe_file) {
 70                 path = exe_file->f_path;
 71                 path_get(&exe_file->f_path);
 72                 fput(exe_file);
 73                 path_nm = d_path(&path, buf, 255);
 74                 path_put(&path);
 75         }
 76 
 77 done:
 78         pr_info("Path: %s\n", path_nm);
 79 }
 80 EXPORT_SYMBOL(print_task_path_n_nm);
 81 
 82 static void show_faulting_vma(unsigned long address, char *buf)
 83 {
 84         struct vm_area_struct *vma;
 85         struct inode *inode;
 86         unsigned long ino = 0;
 87         dev_t dev = 0;
 88         char *nm = buf;
 89         struct mm_struct *active_mm = current->active_mm;
 90 
 91         /* can't use print_vma_addr() yet as it doesn't check for
 92          * non-inclusive vma
 93          */
 94         down_read(&active_mm->mmap_sem);
 95         vma = find_vma(active_mm, address);
 96 
 97         /* check against the find_vma( ) behaviour which returns the next VMA
 98          * if the container VMA is not found
 99          */
100         if (vma && (vma->vm_start <= address)) {
101                 struct file *file = vma->vm_file;
102                 if (file) {
103                         struct path *path = &file->f_path;
104                         nm = d_path(path, buf, PAGE_SIZE - 1);
105                         inode = file_inode(vma->vm_file);
106                         dev = inode->i_sb->s_dev;
107                         ino = inode->i_ino;
108                 }
109                 pr_info("    @off 0x%lx in [%s]\n"
110                         "    VMA: 0x%08lx to 0x%08lx\n",
111                         vma->vm_start < TASK_UNMAPPED_BASE ?
112                                 address : address - vma->vm_start,
113                         nm, vma->vm_start, vma->vm_end);
114         } else
115                 pr_info("    @No matching VMA found\n");
116 
117         up_read(&active_mm->mmap_sem);
118 }
119 
120 static void show_ecr_verbose(struct pt_regs *regs)
121 {
122         unsigned int vec, cause_code;
123         unsigned long address;
124 
125         pr_info("\n[ECR   ]: 0x%08lx => ", regs->event);
126 
127         /* For Data fault, this is data address not instruction addr */
128         address = current->thread.fault_address;
129 
130         vec = regs->ecr_vec;
131         cause_code = regs->ecr_cause;
132 
133         /* For DTLB Miss or ProtV, display the memory involved too */
134         if (vec == ECR_V_DTLB_MISS) {
135                 pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
136                        (cause_code == 0x01) ? "Read" :
137                        ((cause_code == 0x02) ? "Write" : "EX"),
138                        address, regs->ret);
139         } else if (vec == ECR_V_ITLB_MISS) {
140                 pr_cont("Insn could not be fetched\n");
141         } else if (vec == ECR_V_MACH_CHK) {
142                 pr_cont("%s\n", (cause_code == 0x0) ?
143                                         "Double Fault" : "Other Fatal Err");
144 
145         } else if (vec == ECR_V_PROTV) {
146                 if (cause_code == ECR_C_PROTV_INST_FETCH)
147                         pr_cont("Execute from Non-exec Page\n");
148                 else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
149                         pr_cont("Misaligned r/w from 0x%08lx\n", address);
150                 else
151                         pr_cont("%s access not allowed on page\n",
152                                 (cause_code == 0x01) ? "Read" :
153                                 ((cause_code == 0x02) ? "Write" : "EX"));
154         } else if (vec == ECR_V_INSN_ERR) {
155                 pr_cont("Illegal Insn\n");
156         } else {
157                 pr_cont("Check Programmer's Manual\n");
158         }
159 }
160 
161 /************************************************************************
162  *  API called by rest of kernel
163  ***********************************************************************/
164 
165 void show_regs(struct pt_regs *regs)
166 {
167         struct task_struct *tsk = current;
168         struct callee_regs *cregs;
169         char *buf;
170 
171         buf = (char *)__get_free_page(GFP_TEMPORARY);
172         if (!buf)
173                 return;
174 
175         print_task_path_n_nm(tsk, buf);
176         show_regs_print_info(KERN_INFO);
177 
178         show_ecr_verbose(regs);
179 
180         pr_info("[EFA   ]: 0x%08lx\n[BLINK ]: %pS\n[ERET  ]: %pS\n",
181                 current->thread.fault_address,
182                 (void *)regs->blink, (void *)regs->ret);
183 
184         if (user_mode(regs))
185                 show_faulting_vma(regs->ret, buf); /* faulting code, not data */
186 
187         pr_info("[STAT32]: 0x%08lx", regs->status32);
188 
189 #define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit : ""
190         if (!user_mode(regs))
191                 pr_cont(" : %2s %2s %2s %2s %2s\n",
192                         STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1),
193                         STS_BIT(regs, E2), STS_BIT(regs, E1));
194 
195         pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
196                 regs->bta, regs->sp, regs->fp);
197         pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
198                regs->lp_start, regs->lp_end, regs->lp_count);
199 
200         /* print regs->r0 thru regs->r12
201          * Sequential printing was generating horrible code
202          */
203         print_reg_file(&(regs->r0), 0);
204 
205         /* If Callee regs were saved, display them too */
206         cregs = (struct callee_regs *)current->thread.callee_reg;
207         if (cregs)
208                 show_callee_regs(cregs);
209 
210         free_page((unsigned long)buf);
211 }
212 
213 void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
214                             unsigned long address)
215 {
216         current->thread.fault_address = address;
217 
218         /* Caller and Callee regs */
219         show_regs(regs);
220 
221         /* Show stack trace if this Fatality happened in kernel mode */
222         if (!user_mode(regs))
223                 show_stacktrace(current, regs);
224 }
225 
226 #ifdef CONFIG_DEBUG_FS
227 
228 #include <linux/module.h>
229 #include <linux/fs.h>
230 #include <linux/mount.h>
231 #include <linux/pagemap.h>
232 #include <linux/init.h>
233 #include <linux/namei.h>
234 #include <linux/debugfs.h>
235 
236 static struct dentry *test_dentry;
237 static struct dentry *test_dir;
238 static struct dentry *test_u32_dentry;
239 
240 static u32 clr_on_read = 1;
241 
242 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
243 u32 numitlb, numdtlb, num_pte_not_present;
244 
245 static int fill_display_data(char *kbuf)
246 {
247         size_t num = 0;
248         num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);
249         num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);
250         num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);
251 
252         if (clr_on_read)
253                 numitlb = numdtlb = num_pte_not_present = 0;
254 
255         return num;
256 }
257 
258 static int tlb_stats_open(struct inode *inode, struct file *file)
259 {
260         file->private_data = (void *)__get_free_page(GFP_KERNEL);
261         return 0;
262 }
263 
264 /* called on user read(): display the couters */
265 static ssize_t tlb_stats_output(struct file *file,      /* file descriptor */
266                                 char __user *user_buf,  /* user buffer */
267                                 size_t len,             /* length of buffer */
268                                 loff_t *offset)         /* offset in the file */
269 {
270         size_t num;
271         char *kbuf = (char *)file->private_data;
272 
273         /* All of the data can he shoved in one iteration */
274         if (*offset != 0)
275                 return 0;
276 
277         num = fill_display_data(kbuf);
278 
279         /* simple_read_from_buffer() is helper for copy to user space
280            It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
281            @3 (offset) into the user space address starting at @1 (user_buf).
282            @5 (len) is max size of user buffer
283          */
284         return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
285 }
286 
287 /* called on user write : clears the counters */
288 static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
289                                size_t length, loff_t *offset)
290 {
291         numitlb = numdtlb = num_pte_not_present = 0;
292         return length;
293 }
294 
295 static int tlb_stats_close(struct inode *inode, struct file *file)
296 {
297         free_page((unsigned long)(file->private_data));
298         return 0;
299 }
300 
301 static const struct file_operations tlb_stats_file_ops = {
302         .read = tlb_stats_output,
303         .write = tlb_stats_clear,
304         .open = tlb_stats_open,
305         .release = tlb_stats_close
306 };
307 #endif
308 
309 static int __init arc_debugfs_init(void)
310 {
311         test_dir = debugfs_create_dir("arc", NULL);
312 
313 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
314         test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
315                                           &tlb_stats_file_ops);
316 #endif
317 
318         test_u32_dentry =
319             debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
320 
321         return 0;
322 }
323 
324 module_init(arc_debugfs_init);
325 
326 static void __exit arc_debugfs_exit(void)
327 {
328         debugfs_remove(test_u32_dentry);
329         debugfs_remove(test_dentry);
330         debugfs_remove(test_dir);
331 }
332 module_exit(arc_debugfs_exit);
333 
334 #endif
335 

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