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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 
 90         /* can't use print_vma_addr() yet as it doesn't check for
 91          * non-inclusive vma
 92          */
 93 
 94         vma = find_vma(current->active_mm, address);
 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) {
102                         struct path *path = &file->f_path;
103                         nm = d_path(path, buf, PAGE_SIZE - 1);
104                         inode = vma->vm_file->f_path.dentry->d_inode;
105                         dev = inode->i_sb->s_dev;
106                         ino = inode->i_ino;
107                 }
108                 pr_info("    @off 0x%lx in [%s]\n"
109                         "    VMA: 0x%08lx to 0x%08lx\n",
110                         vma->vm_start < TASK_UNMAPPED_BASE ?
111                                 address : address - vma->vm_start,
112                         nm, vma->vm_start, vma->vm_end);
113         } else {
114                 pr_info("    @No matching VMA found\n");
115         }
116 }
117 
118 static void show_ecr_verbose(struct pt_regs *regs)
119 {
120         unsigned int vec, cause_code, cause_reg;
121         unsigned long address;
122 
123         cause_reg = current->thread.cause_code;
124         pr_info("\n[ECR   ]: 0x%08x => ", cause_reg);
125 
126         /* For Data fault, this is data address not instruction addr */
127         address = current->thread.fault_address;
128 
129         vec = cause_reg >> 16;
130         cause_code = (cause_reg >> 8) & 0xFF;
131 
132         /* For DTLB Miss or ProtV, display the memory involved too */
133         if (vec == ECR_V_DTLB_MISS) {
134                 pr_cont("Invalid %s 0x%08lx by insn @ 0x%08lx\n",
135                        (cause_code == 0x01) ? "Read From" :
136                        ((cause_code == 0x02) ? "Write to" : "EX"),
137                        address, regs->ret);
138         } else if (vec == ECR_V_ITLB_MISS) {
139                 pr_cont("Insn could not be fetched\n");
140         } else if (vec == ECR_V_MACH_CHK) {
141                 pr_cont("%s\n", (cause_code == 0x0) ?
142                                         "Double Fault" : "Other Fatal Err");
143 
144         } else if (vec == ECR_V_PROTV) {
145                 if (cause_code == ECR_C_PROTV_INST_FETCH)
146                         pr_cont("Execute from Non-exec Page\n");
147                 else if (cause_code == ECR_C_PROTV_LOAD)
148                         pr_cont("Read from Non-readable Page\n");
149                 else if (cause_code == ECR_C_PROTV_STORE)
150                         pr_cont("Write to Non-writable Page\n");
151                 else if (cause_code == ECR_C_PROTV_XCHG)
152                         pr_cont("Data exchange protection violation\n");
153                 else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
154                         pr_cont("Misaligned r/w from 0x%08lx\n", address);
155         } else if (vec == ECR_V_INSN_ERR) {
156                 pr_cont("Illegal Insn\n");
157         } else {
158                 pr_cont("Check Programmer's Manual\n");
159         }
160 }
161 
162 /************************************************************************
163  *  API called by rest of kernel
164  ***********************************************************************/
165 
166 void show_regs(struct pt_regs *regs)
167 {
168         struct task_struct *tsk = current;
169         struct callee_regs *cregs;
170         char *buf;
171 
172         buf = (char *)__get_free_page(GFP_TEMPORARY);
173         if (!buf)
174                 return;
175 
176         print_task_path_n_nm(tsk, buf);
177         show_regs_print_info(KERN_INFO);
178 
179         if (current->thread.cause_code)
180                 show_ecr_verbose(regs);
181 
182         pr_info("[EFA   ]: 0x%08lx\n[BLINK ]: %pS\n[ERET  ]: %pS\n",
183                 current->thread.fault_address,
184                 (void *)regs->blink, (void *)regs->ret);
185 
186         if (user_mode(regs))
187                 show_faulting_vma(regs->ret, buf); /* faulting code, not data */
188 
189         pr_info("[STAT32]: 0x%08lx", regs->status32);
190 
191 #define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit : ""
192         if (!user_mode(regs))
193                 pr_cont(" : %2s %2s %2s %2s %2s\n",
194                         STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1),
195                         STS_BIT(regs, E2), STS_BIT(regs, E1));
196 
197         pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
198                 regs->bta, regs->sp, regs->fp);
199         pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
200                regs->lp_start, regs->lp_end, regs->lp_count);
201 
202         /* print regs->r0 thru regs->r12
203          * Sequential printing was generating horrible code
204          */
205         print_reg_file(&(regs->r0), 0);
206 
207         /* If Callee regs were saved, display them too */
208         cregs = (struct callee_regs *)current->thread.callee_reg;
209         if (cregs)
210                 show_callee_regs(cregs);
211 
212         free_page((unsigned long)buf);
213 }
214 
215 void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
216                             unsigned long address, unsigned long cause_reg)
217 {
218         current->thread.fault_address = address;
219         current->thread.cause_code = cause_reg;
220 
221         /* Caller and Callee regs */
222         show_regs(regs);
223 
224         /* Show stack trace if this Fatality happened in kernel mode */
225         if (!user_mode(regs))
226                 show_stacktrace(current, regs);
227 }
228 
229 #ifdef CONFIG_DEBUG_FS
230 
231 #include <linux/module.h>
232 #include <linux/fs.h>
233 #include <linux/mount.h>
234 #include <linux/pagemap.h>
235 #include <linux/init.h>
236 #include <linux/namei.h>
237 #include <linux/debugfs.h>
238 
239 static struct dentry *test_dentry;
240 static struct dentry *test_dir;
241 static struct dentry *test_u32_dentry;
242 
243 static u32 clr_on_read = 1;
244 
245 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
246 u32 numitlb, numdtlb, num_pte_not_present;
247 
248 static int fill_display_data(char *kbuf)
249 {
250         size_t num = 0;
251         num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);
252         num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);
253         num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);
254 
255         if (clr_on_read)
256                 numitlb = numdtlb = num_pte_not_present = 0;
257 
258         return num;
259 }
260 
261 static int tlb_stats_open(struct inode *inode, struct file *file)
262 {
263         file->private_data = (void *)__get_free_page(GFP_KERNEL);
264         return 0;
265 }
266 
267 /* called on user read(): display the couters */
268 static ssize_t tlb_stats_output(struct file *file,      /* file descriptor */
269                                 char __user *user_buf,  /* user buffer */
270                                 size_t len,             /* length of buffer */
271                                 loff_t *offset)         /* offset in the file */
272 {
273         size_t num;
274         char *kbuf = (char *)file->private_data;
275 
276         /* All of the data can he shoved in one iteration */
277         if (*offset != 0)
278                 return 0;
279 
280         num = fill_display_data(kbuf);
281 
282         /* simple_read_from_buffer() is helper for copy to user space
283            It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
284            @3 (offset) into the user space address starting at @1 (user_buf).
285            @5 (len) is max size of user buffer
286          */
287         return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
288 }
289 
290 /* called on user write : clears the counters */
291 static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
292                                size_t length, loff_t *offset)
293 {
294         numitlb = numdtlb = num_pte_not_present = 0;
295         return length;
296 }
297 
298 static int tlb_stats_close(struct inode *inode, struct file *file)
299 {
300         free_page((unsigned long)(file->private_data));
301         return 0;
302 }
303 
304 static const struct file_operations tlb_stats_file_ops = {
305         .read = tlb_stats_output,
306         .write = tlb_stats_clear,
307         .open = tlb_stats_open,
308         .release = tlb_stats_close
309 };
310 #endif
311 
312 static int __init arc_debugfs_init(void)
313 {
314         test_dir = debugfs_create_dir("arc", NULL);
315 
316 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
317         test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
318                                           &tlb_stats_file_ops);
319 #endif
320 
321         test_u32_dentry =
322             debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
323 
324         return 0;
325 }
326 
327 module_init(arc_debugfs_init);
328 
329 static void __exit arc_debugfs_exit(void)
330 {
331         debugfs_remove(test_u32_dentry);
332         debugfs_remove(test_dentry);
333         debugfs_remove(test_dir);
334 }
335 module_exit(arc_debugfs_exit);
336 
337 #endif
338 

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