2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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
8 #include <linux/ptrace.h>
9 #include <linux/module.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 #include <asm/irqflags.h>
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
24 static noinline void print_reg_file(long *reg_rev, int start_num)
28 int n = 0, len = sizeof(buf);
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);
34 if (((i + 1) % 3) == 0)
35 n += scnprintf(buf + n, len - n, "\n");
37 /* because pt_regs has regs reversed: r12..r0, r25..r13 */
38 if (is_isa_arcv2() && start_num == 0)
45 n += scnprintf(buf + n, len - n, "\n\n");
47 /* To continue printing callee regs on same line as scratch regs */
54 static void show_callee_regs(struct callee_regs *cregs)
56 print_reg_file(&(cregs->r13), 13);
59 static void print_task_path_n_nm(struct task_struct *tsk, char *buf)
64 struct file *exe_file;
66 mm = get_task_mm(tsk);
70 exe_file = get_mm_exe_file(mm);
74 path = exe_file->f_path;
75 path_get(&exe_file->f_path);
77 path_nm = d_path(&path, buf, 255);
82 pr_info("Path: %s\n", path_nm);
85 static void show_faulting_vma(unsigned long address, char *buf)
87 struct vm_area_struct *vma;
89 unsigned long ino = 0;
92 struct mm_struct *active_mm = current->active_mm;
94 /* can't use print_vma_addr() yet as it doesn't check for
97 down_read(&active_mm->mmap_sem);
98 vma = find_vma(active_mm, address);
100 /* check against the find_vma( ) behaviour which returns the next VMA
101 * if the container VMA is not found
103 if (vma && (vma->vm_start <= address)) {
104 struct file *file = vma->vm_file;
106 struct path *path = &file->f_path;
107 nm = d_path(path, buf, PAGE_SIZE - 1);
108 inode = file_inode(vma->vm_file);
109 dev = inode->i_sb->s_dev;
112 pr_info(" @off 0x%lx in [%s]\n"
113 " VMA: 0x%08lx to 0x%08lx\n",
114 vma->vm_start < TASK_UNMAPPED_BASE ?
115 address : address - vma->vm_start,
116 nm, vma->vm_start, vma->vm_end);
118 pr_info(" @No matching VMA found\n");
120 up_read(&active_mm->mmap_sem);
123 static void show_ecr_verbose(struct pt_regs *regs)
125 unsigned int vec, cause_code;
126 unsigned long address;
128 pr_info("\n[ECR ]: 0x%08lx => ", regs->event);
130 /* For Data fault, this is data address not instruction addr */
131 address = current->thread.fault_address;
134 cause_code = regs->ecr_cause;
136 /* For DTLB Miss or ProtV, display the memory involved too */
137 if (vec == ECR_V_DTLB_MISS) {
138 pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
139 (cause_code == 0x01) ? "Read" :
140 ((cause_code == 0x02) ? "Write" : "EX"),
142 } else if (vec == ECR_V_ITLB_MISS) {
143 pr_cont("Insn could not be fetched\n");
144 } else if (vec == ECR_V_MACH_CHK) {
145 pr_cont("%s\n", (cause_code == 0x0) ?
146 "Double Fault" : "Other Fatal Err");
148 } else if (vec == ECR_V_PROTV) {
149 if (cause_code == ECR_C_PROTV_INST_FETCH)
150 pr_cont("Execute from Non-exec Page\n");
151 else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
152 pr_cont("Misaligned r/w from 0x%08lx\n", address);
154 pr_cont("%s access not allowed on page\n",
155 (cause_code == 0x01) ? "Read" :
156 ((cause_code == 0x02) ? "Write" : "EX"));
157 } else if (vec == ECR_V_INSN_ERR) {
158 pr_cont("Illegal Insn\n");
159 #ifdef CONFIG_ISA_ARCV2
160 } else if (vec == ECR_V_MEM_ERR) {
161 if (cause_code == 0x00)
162 pr_cont("Bus Error from Insn Mem\n");
163 else if (cause_code == 0x10)
164 pr_cont("Bus Error from Data Mem\n");
166 pr_cont("Bus Error, check PRM\n");
169 pr_cont("Check Programmer's Manual\n");
173 /************************************************************************
174 * API called by rest of kernel
175 ***********************************************************************/
177 void show_regs(struct pt_regs *regs)
179 struct task_struct *tsk = current;
180 struct callee_regs *cregs;
183 buf = (char *)__get_free_page(GFP_TEMPORARY);
187 print_task_path_n_nm(tsk, buf);
188 show_regs_print_info(KERN_INFO);
190 show_ecr_verbose(regs);
192 pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n",
193 current->thread.fault_address,
194 (void *)regs->blink, (void *)regs->ret);
197 show_faulting_vma(regs->ret, buf); /* faulting code, not data */
199 pr_info("[STAT32]: 0x%08lx", regs->status32);
201 #define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
203 #ifdef CONFIG_ISA_ARCOMPACT
204 pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n",
205 (regs->status32 & STATUS_U_MASK) ? "U " : "K ",
206 STS_BIT(regs, DE), STS_BIT(regs, AE),
207 STS_BIT(regs, A2), STS_BIT(regs, A1),
208 STS_BIT(regs, E2), STS_BIT(regs, E1));
210 pr_cont(" : %2s%2s%2s%2s\n",
212 (regs->status32 & STATUS_U_MASK) ? "U " : "K ",
213 STS_BIT(regs, DE), STS_BIT(regs, AE));
215 pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
216 regs->bta, regs->sp, regs->fp);
217 pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
218 regs->lp_start, regs->lp_end, regs->lp_count);
220 /* print regs->r0 thru regs->r12
221 * Sequential printing was generating horrible code
223 print_reg_file(&(regs->r0), 0);
225 /* If Callee regs were saved, display them too */
226 cregs = (struct callee_regs *)current->thread.callee_reg;
228 show_callee_regs(cregs);
230 free_page((unsigned long)buf);
233 void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
234 unsigned long address)
236 current->thread.fault_address = address;
238 /* Caller and Callee regs */
241 /* Show stack trace if this Fatality happened in kernel mode */
242 if (!user_mode(regs))
243 show_stacktrace(current, regs);
246 #ifdef CONFIG_DEBUG_FS
248 #include <linux/module.h>
249 #include <linux/fs.h>
250 #include <linux/mount.h>
251 #include <linux/pagemap.h>
252 #include <linux/init.h>
253 #include <linux/namei.h>
254 #include <linux/debugfs.h>
256 static struct dentry *test_dentry;
257 static struct dentry *test_dir;
258 static struct dentry *test_u32_dentry;
260 static u32 clr_on_read = 1;
262 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
263 u32 numitlb, numdtlb, num_pte_not_present;
265 static int fill_display_data(char *kbuf)
268 num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);
269 num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);
270 num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);
273 numitlb = numdtlb = num_pte_not_present = 0;
278 static int tlb_stats_open(struct inode *inode, struct file *file)
280 file->private_data = (void *)__get_free_page(GFP_KERNEL);
284 /* called on user read(): display the couters */
285 static ssize_t tlb_stats_output(struct file *file, /* file descriptor */
286 char __user *user_buf, /* user buffer */
287 size_t len, /* length of buffer */
288 loff_t *offset) /* offset in the file */
291 char *kbuf = (char *)file->private_data;
293 /* All of the data can he shoved in one iteration */
297 num = fill_display_data(kbuf);
299 /* simple_read_from_buffer() is helper for copy to user space
300 It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
301 @3 (offset) into the user space address starting at @1 (user_buf).
302 @5 (len) is max size of user buffer
304 return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
307 /* called on user write : clears the counters */
308 static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
309 size_t length, loff_t *offset)
311 numitlb = numdtlb = num_pte_not_present = 0;
315 static int tlb_stats_close(struct inode *inode, struct file *file)
317 free_page((unsigned long)(file->private_data));
321 static const struct file_operations tlb_stats_file_ops = {
322 .read = tlb_stats_output,
323 .write = tlb_stats_clear,
324 .open = tlb_stats_open,
325 .release = tlb_stats_close
329 static int __init arc_debugfs_init(void)
331 test_dir = debugfs_create_dir("arc", NULL);
333 #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
334 test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
335 &tlb_stats_file_ops);
339 debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
344 module_init(arc_debugfs_init);
346 static void __exit arc_debugfs_exit(void)
348 debugfs_remove(test_u32_dentry);
349 debugfs_remove(test_dentry);
350 debugfs_remove(test_dir);
352 module_exit(arc_debugfs_exit);