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/proc_fs.h>
14 #include <linux/file.h>
15 #include <linux/sched/mm.h>
16 #include <linux/sched/debug.h>
18 #include <asm/arcregs.h>
19 #include <asm/irqflags.h>
22 * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
23 * -Prints 3 regs per line and a CR.
24 * -To continue, callee regs right after scratch, special handling of CR
26 static noinline void print_reg_file(long *reg_rev, int start_num)
30 int n = 0, len = sizeof(buf);
32 for (i = start_num; i < start_num + 13; i++) {
33 n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
34 i, (unsigned long)*reg_rev);
36 if (((i + 1) % 3) == 0)
37 n += scnprintf(buf + n, len - n, "\n");
39 /* because pt_regs has regs reversed: r12..r0, r25..r13 */
40 if (is_isa_arcv2() && start_num == 0)
47 n += scnprintf(buf + n, len - n, "\n\n");
49 /* To continue printing callee regs on same line as scratch regs */
56 static void show_callee_regs(struct callee_regs *cregs)
58 print_reg_file(&(cregs->r13), 13);
61 static void print_task_path_n_nm(struct task_struct *tsk, char *buf)
65 struct file *exe_file;
67 mm = get_task_mm(tsk);
71 exe_file = get_mm_exe_file(mm);
75 path_nm = file_path(exe_file, buf, 255);
80 pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");
83 static void show_faulting_vma(unsigned long address, char *buf)
85 struct vm_area_struct *vma;
87 unsigned long ino = 0;
90 struct mm_struct *active_mm = current->active_mm;
92 /* can't use print_vma_addr() yet as it doesn't check for
95 down_read(&active_mm->mmap_sem);
96 vma = find_vma(active_mm, address);
98 /* check against the find_vma( ) behaviour which returns the next VMA
99 * if the container VMA is not found
101 if (vma && (vma->vm_start <= address)) {
102 struct file *file = vma->vm_file;
104 nm = file_path(file, buf, PAGE_SIZE - 1);
105 inode = file_inode(vma->vm_file);
106 dev = inode->i_sb->s_dev;
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);
115 pr_info(" @No matching VMA found\n");
117 up_read(&active_mm->mmap_sem);
120 static void show_ecr_verbose(struct pt_regs *regs)
122 unsigned int vec, cause_code;
123 unsigned long address;
125 pr_info("\n[ECR ]: 0x%08lx => ", regs->event);
127 /* For Data fault, this is data address not instruction addr */
128 address = current->thread.fault_address;
131 cause_code = regs->ecr_cause;
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"),
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("Machine Check (%s)\n", (cause_code == 0x0) ?
143 "Double Fault" : "Other Fatal Err");
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);
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 #ifdef CONFIG_ISA_ARCV2
157 } else if (vec == ECR_V_MEM_ERR) {
158 if (cause_code == 0x00)
159 pr_cont("Bus Error from Insn Mem\n");
160 else if (cause_code == 0x10)
161 pr_cont("Bus Error from Data Mem\n");
163 pr_cont("Bus Error, check PRM\n");
165 } else if (vec == ECR_V_TRAP) {
166 if (regs->ecr_param == 5)
167 pr_cont("gcc generated __builtin_trap\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_KERNEL);
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 /* Show fault description */
239 pr_info("\n%s\n", str);
241 /* Caller and Callee regs */
244 /* Show stack trace if this Fatality happened in kernel mode */
245 if (!user_mode(regs))
246 show_stacktrace(current, regs);