Vineet Gupta | c08098f | 2013-01-18 15:12:21 +0530 | [diff] [blame] | 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> |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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 | |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 36 | /* because pt_regs has regs reversed: r12..r0, r25..r13 */ |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 37 | reg_rev--; |
| 38 | } |
| 39 | |
| 40 | if (start_num != 0) |
| 41 | n += scnprintf(buf + n, len - n, "\n\n"); |
| 42 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 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); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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: |
Vineet Gupta | 681a90f | 2013-04-30 15:27:19 -0700 | [diff] [blame] | 78 | pr_info("Path: %s\n", path_nm); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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; |
Davidlohr Bueso | 5040573 | 2014-06-04 16:07:29 -0700 | [diff] [blame] | 89 | struct mm_struct *active_mm = current->active_mm; |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 90 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 91 | /* can't use print_vma_addr() yet as it doesn't check for |
| 92 | * non-inclusive vma |
| 93 | */ |
Davidlohr Bueso | 5040573 | 2014-06-04 16:07:29 -0700 | [diff] [blame] | 94 | down_read(&active_mm->mmap_sem); |
| 95 | vma = find_vma(active_mm, address); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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); |
Al Viro | e77e430 | 2013-06-16 17:25:12 +0400 | [diff] [blame] | 105 | inode = file_inode(vma->vm_file); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 106 | dev = inode->i_sb->s_dev; |
| 107 | ino = inode->i_ino; |
| 108 | } |
| 109 | pr_info(" @off 0x%lx in [%s]\n" |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 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); |
Davidlohr Bueso | 5040573 | 2014-06-04 16:07:29 -0700 | [diff] [blame] | 114 | } else |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 115 | pr_info(" @No matching VMA found\n"); |
Davidlohr Bueso | 5040573 | 2014-06-04 16:07:29 -0700 | [diff] [blame] | 116 | |
| 117 | up_read(&active_mm->mmap_sem); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | static void show_ecr_verbose(struct pt_regs *regs) |
| 121 | { |
Vineet Gupta | 502a0c7 | 2013-06-11 18:56:54 +0530 | [diff] [blame] | 122 | unsigned int vec, cause_code; |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 123 | unsigned long address; |
| 124 | |
Vineet Gupta | 502a0c7 | 2013-06-11 18:56:54 +0530 | [diff] [blame] | 125 | pr_info("\n[ECR ]: 0x%08lx => ", regs->event); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 126 | |
| 127 | /* For Data fault, this is data address not instruction addr */ |
| 128 | address = current->thread.fault_address; |
| 129 | |
Vineet Gupta | 502a0c7 | 2013-06-11 18:56:54 +0530 | [diff] [blame] | 130 | vec = regs->ecr_vec; |
| 131 | cause_code = regs->ecr_cause; |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 132 | |
| 133 | /* For DTLB Miss or ProtV, display the memory involved too */ |
| 134 | if (vec == ECR_V_DTLB_MISS) { |
Vineet Gupta | 6546415 | 2013-06-12 15:35:18 +0530 | [diff] [blame] | 135 | pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n", |
| 136 | (cause_code == 0x01) ? "Read" : |
| 137 | ((cause_code == 0x02) ? "Write" : "EX"), |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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"); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 148 | else if (cause_code == ECR_C_PROTV_MISALIG_DATA) |
| 149 | pr_cont("Misaligned r/w from 0x%08lx\n", address); |
Vineet Gupta | 6546415 | 2013-06-12 15:35:18 +0530 | [diff] [blame] | 150 | else |
| 151 | pr_cont("%s access not allowed on page\n", |
| 152 | (cause_code == 0x01) ? "Read" : |
| 153 | ((cause_code == 0x02) ? "Write" : "EX")); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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 | ***********************************************************************/ |
Vineet Gupta | c08098f | 2013-01-18 15:12:21 +0530 | [diff] [blame] | 164 | |
| 165 | void show_regs(struct pt_regs *regs) |
| 166 | { |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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); |
Tejun Heo | a43cb95 | 2013-04-30 15:27:17 -0700 | [diff] [blame] | 176 | show_regs_print_info(KERN_INFO); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 177 | |
Vineet Gupta | 502a0c7 | 2013-06-11 18:56:54 +0530 | [diff] [blame] | 178 | show_ecr_verbose(regs); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 179 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 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); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 183 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 184 | if (user_mode(regs)) |
| 185 | show_faulting_vma(regs->ret, buf); /* faulting code, not data */ |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 186 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 187 | pr_info("[STAT32]: 0x%08lx", regs->status32); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 188 | |
Vineet Gupta | bd3c8b1 | 2013-03-22 17:16:49 +0530 | [diff] [blame] | 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); |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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); |
Vineet Gupta | c08098f | 2013-01-18 15:12:21 +0530 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | void show_kernel_fault_diag(const char *str, struct pt_regs *regs, |
Vineet Gupta | 38a9ff6 | 2013-06-12 15:13:40 +0530 | [diff] [blame] | 214 | unsigned long address) |
Vineet Gupta | c08098f | 2013-01-18 15:12:21 +0530 | [diff] [blame] | 215 | { |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 216 | current->thread.fault_address = address; |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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); |
Vineet Gupta | c08098f | 2013-01-18 15:12:21 +0530 | [diff] [blame] | 224 | } |
Vineet Gupta | 0ef88a5 | 2013-01-18 15:12:23 +0530 | [diff] [blame] | 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 |