2 * Copyright (C) 2014 Google, Inc.
3 * Author: Colin Cross <ccross@android.com>
4 * Copyright (C) 2010-2015 NVIDIA Corporation. All rights reserved.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/ptrace.h>
18 #include <linux/uaccess.h>
20 #include <asm/stacktrace.h>
22 #include "fiq_debugger_priv.h"
24 static char *mode_name(unsigned cpsr)
26 switch (cpsr & MODE_MASK) {
27 case USR_MODE: return "USR";
28 case FIQ_MODE: return "FIQ";
29 case IRQ_MODE: return "IRQ";
30 case SVC_MODE: return "SVC";
31 case ABT_MODE: return "ABT";
32 case UND_MODE: return "UND";
33 case SYSTEM_MODE: return "SYS";
34 default: return "???";
38 void fiq_debugger_dump_pc(struct fiq_debugger_output *output,
39 const struct pt_regs *regs)
41 output->printf(output, " pc %08x cpsr %08x mode %s\n",
42 regs->ARM_pc, regs->ARM_cpsr, mode_name(regs->ARM_cpsr));
45 void fiq_debugger_dump_regs(struct fiq_debugger_output *output,
46 const struct pt_regs *regs)
48 output->printf(output,
49 " r0 %08x r1 %08x r2 %08x r3 %08x\n",
50 regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
51 output->printf(output,
52 " r4 %08x r5 %08x r6 %08x r7 %08x\n",
53 regs->ARM_r4, regs->ARM_r5, regs->ARM_r6, regs->ARM_r7);
54 output->printf(output,
55 " r8 %08x r9 %08x r10 %08x r11 %08x mode %s\n",
56 regs->ARM_r8, regs->ARM_r9, regs->ARM_r10, regs->ARM_fp,
57 mode_name(regs->ARM_cpsr));
58 output->printf(output,
59 " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
60 regs->ARM_ip, regs->ARM_sp, regs->ARM_lr, regs->ARM_pc,
67 unsigned long spsr_svc;
71 unsigned long spsr_abt;
75 unsigned long spsr_und;
79 unsigned long spsr_irq;
83 unsigned long r10_fiq;
84 unsigned long r11_fiq;
85 unsigned long r12_fiq;
88 unsigned long spsr_fiq;
91 static void __naked get_mode_regs(struct mode_regs *regs)
95 "msr cpsr_c, #0xd3 @(SVC_MODE | PSR_I_BIT | PSR_F_BIT)\n"
96 "stmia r0!, {r13 - r14}\n"
98 "msr cpsr_c, #0xd7 @(ABT_MODE | PSR_I_BIT | PSR_F_BIT)\n"
99 "stmia r0!, {r2, r13 - r14}\n"
101 "msr cpsr_c, #0xdb @(UND_MODE | PSR_I_BIT | PSR_F_BIT)\n"
102 "stmia r0!, {r2, r13 - r14}\n"
104 "msr cpsr_c, #0xd2 @(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)\n"
105 "stmia r0!, {r2, r13 - r14}\n"
107 "msr cpsr_c, #0xd1 @(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)\n"
108 "stmia r0!, {r2, r8 - r14}\n"
116 void fiq_debugger_dump_allregs(struct fiq_debugger_output *output,
117 const struct pt_regs *regs)
119 struct mode_regs mode_regs;
120 unsigned long mode = regs->ARM_cpsr & MODE_MASK;
122 fiq_debugger_dump_regs(output, regs);
123 get_mode_regs(&mode_regs);
125 output->printf(output,
126 "%csvc: sp %08x lr %08x spsr %08x\n",
127 mode == SVC_MODE ? '*' : ' ',
128 mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc);
129 output->printf(output,
130 "%cabt: sp %08x lr %08x spsr %08x\n",
131 mode == ABT_MODE ? '*' : ' ',
132 mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt);
133 output->printf(output,
134 "%cund: sp %08x lr %08x spsr %08x\n",
135 mode == UND_MODE ? '*' : ' ',
136 mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und);
137 output->printf(output,
138 "%cirq: sp %08x lr %08x spsr %08x\n",
139 mode == IRQ_MODE ? '*' : ' ',
140 mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq);
141 output->printf(output,
142 "%cfiq: r8 %08x r9 %08x r10 %08x r11 %08x r12 %08x\n",
143 mode == FIQ_MODE ? '*' : ' ',
144 mode_regs.r8_fiq, mode_regs.r9_fiq, mode_regs.r10_fiq,
145 mode_regs.r11_fiq, mode_regs.r12_fiq);
146 output->printf(output,
147 " fiq: sp %08x lr %08x spsr %08x\n",
148 mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq);
151 struct stacktrace_state {
152 struct fiq_debugger_output *output;
156 static int report_trace(struct stackframe *frame, void *d)
158 struct stacktrace_state *sts = d;
161 sts->output->printf(sts->output,
162 " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n",
163 frame->pc, frame->pc, frame->lr, frame->lr,
164 frame->sp, frame->fp);
168 sts->output->printf(sts->output, " ...\n");
170 return sts->depth == 0;
174 struct frame_tail *fp;
177 } __attribute__((packed));
179 static struct frame_tail *user_backtrace(struct fiq_debugger_output *output,
180 struct frame_tail *tail)
182 struct frame_tail buftail[2];
184 /* Also check accessibility of one struct frame_tail beyond */
185 if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) {
186 output->printf(output, " invalid frame pointer %p\n",
190 if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) {
191 output->printf(output,
192 " failed to copy frame pointer %p\n", tail);
196 output->printf(output, " %p\n", buftail[0].lr);
198 /* frame pointers should strictly progress back up the stack
199 * (towards higher addresses) */
200 if (tail >= buftail[0].fp)
203 return buftail[0].fp-1;
206 void fiq_debugger_dump_stacktrace(struct fiq_debugger_output *output,
207 const struct pt_regs *regs, unsigned int depth, void *ssp)
209 struct frame_tail *tail;
210 struct thread_info *real_thread_info = THREAD_INFO(ssp);
211 struct stacktrace_state sts;
215 *current_thread_info() = *real_thread_info;
218 output->printf(output, "current NULL\n");
220 output->printf(output, "pid: %d comm: %s\n",
221 current->pid, current->comm);
222 fiq_debugger_dump_regs(output, regs);
224 if (!user_mode(regs)) {
225 struct stackframe frame;
226 frame.fp = regs->ARM_fp;
227 frame.sp = regs->ARM_sp;
228 frame.lr = regs->ARM_lr;
229 frame.pc = regs->ARM_pc;
230 output->printf(output,
231 " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n",
232 regs->ARM_pc, regs->ARM_pc, regs->ARM_lr, regs->ARM_lr,
233 regs->ARM_sp, regs->ARM_fp);
234 walk_stackframe(&frame, report_trace, &sts);
238 tail = ((struct frame_tail *) regs->ARM_fp) - 1;
239 while (depth-- && tail && !((unsigned long) tail & 3))
240 tail = user_backtrace(output, tail);