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Diffstat (limited to 'debuggerd/arm/machine.cpp')
| -rw-r--r-- | debuggerd/arm/machine.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/debuggerd/arm/machine.cpp b/debuggerd/arm/machine.cpp new file mode 100644 index 0000000..4ab6026 --- /dev/null +++ b/debuggerd/arm/machine.cpp @@ -0,0 +1,179 @@ +/* system/debuggerd/debuggerd.c +** +** Copyright 2006, The Android Open Source Project +** +** Licensed under the Apache License, Version 2.0 (the "License"); +** you may not use this file except in compliance with the License. +** You may obtain a copy of the License at +** +** http://www.apache.org/licenses/LICENSE-2.0 +** +** Unless required by applicable law or agreed to in writing, software +** distributed under the License is distributed on an "AS IS" BASIS, +** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +** See the License for the specific language governing permissions and +** limitations under the License. +*/ + +#include <errno.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ptrace.h> +#include <sys/types.h> +#include <sys/user.h> + +#include "../utility.h" +#include "../machine.h" + +/* enable to dump memory pointed to by every register */ +#define DUMP_MEMORY_FOR_ALL_REGISTERS 1 + +#ifdef WITH_VFP +#ifdef WITH_VFP_D32 +#define NUM_VFP_REGS 32 +#else +#define NUM_VFP_REGS 16 +#endif +#endif + +static void dump_memory(log_t* log, pid_t tid, uintptr_t addr, int scope_flags) { + char code_buffer[64]; /* actual 8+1+((8+1)*4) + 1 == 45 */ + char ascii_buffer[32]; /* actual 16 + 1 == 17 */ + uintptr_t p, end; + + p = addr & ~3; + p -= 32; + if (p > addr) { + /* catch underflow */ + p = 0; + } + /* Dump more memory content for the crashing thread. */ + end = p + 256; + /* catch overflow; 'end - p' has to be multiples of 16 */ + while (end < p) + end -= 16; + + /* Dump the code around PC as: + * addr contents ascii + * 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q + * 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p...... + */ + while (p < end) { + char* asc_out = ascii_buffer; + + sprintf(code_buffer, "%08x ", p); + + int i; + for (i = 0; i < 4; i++) { + /* + * If we see (data == -1 && errno != 0), we know that the ptrace + * call failed, probably because we're dumping memory in an + * unmapped or inaccessible page. I don't know if there's + * value in making that explicit in the output -- it likely + * just complicates parsing and clarifies nothing for the + * enlightened reader. + */ + long data = ptrace(PTRACE_PEEKTEXT, tid, (void*)p, NULL); + sprintf(code_buffer + strlen(code_buffer), "%08lx ", data); + + /* Enable the following code blob to dump ASCII values */ +#if 0 + int j; + for (j = 0; j < 4; j++) { + /* + * Our isprint() allows high-ASCII characters that display + * differently (often badly) in different viewers, so we + * just use a simpler test. + */ + char val = (data >> (j*8)) & 0xff; + if (val >= 0x20 && val < 0x7f) { + *asc_out++ = val; + } else { + *asc_out++ = '.'; + } + } +#endif + p += 4; + } + *asc_out = '\0'; + _LOG(log, scope_flags, " %s %s\n", code_buffer, ascii_buffer); + } +} + +/* + * If configured to do so, dump memory around *all* registers + * for the crashing thread. + */ +void dump_memory_and_code(log_t* log, pid_t tid, int scope_flags) { + struct pt_regs regs; + if(ptrace(PTRACE_GETREGS, tid, 0, ®s)) { + return; + } + + if (IS_AT_FAULT(scope_flags) && DUMP_MEMORY_FOR_ALL_REGISTERS) { + static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp"; + + for (int reg = 0; reg < 14; reg++) { + /* this may not be a valid way to access, but it'll do for now */ + uintptr_t addr = regs.uregs[reg]; + + /* + * Don't bother if it looks like a small int or ~= null, or if + * it's in the kernel area. + */ + if (addr < 4096 || addr >= 0xc0000000) { + continue; + } + + _LOG(log, scope_flags | SCOPE_SENSITIVE, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); + dump_memory(log, tid, addr, scope_flags | SCOPE_SENSITIVE); + } + } + + /* explicitly allow upload of code dump logging */ + _LOG(log, scope_flags, "\ncode around pc:\n"); + dump_memory(log, tid, (uintptr_t)regs.ARM_pc, scope_flags); + + if (regs.ARM_pc != regs.ARM_lr) { + _LOG(log, scope_flags, "\ncode around lr:\n"); + dump_memory(log, tid, (uintptr_t)regs.ARM_lr, scope_flags); + } +} + +void dump_registers(log_t* log, pid_t tid, int scope_flags) +{ + struct pt_regs r; + if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { + _LOG(log, scope_flags, "cannot get registers: %s\n", strerror(errno)); + return; + } + + _LOG(log, scope_flags, " r0 %08x r1 %08x r2 %08x r3 %08x\n", + (uint32_t)r.ARM_r0, (uint32_t)r.ARM_r1, (uint32_t)r.ARM_r2, (uint32_t)r.ARM_r3); + _LOG(log, scope_flags, " r4 %08x r5 %08x r6 %08x r7 %08x\n", + (uint32_t)r.ARM_r4, (uint32_t)r.ARM_r5, (uint32_t)r.ARM_r6, (uint32_t)r.ARM_r7); + _LOG(log, scope_flags, " r8 %08x r9 %08x sl %08x fp %08x\n", + (uint32_t)r.ARM_r8, (uint32_t)r.ARM_r9, (uint32_t)r.ARM_r10, (uint32_t)r.ARM_fp); + _LOG(log, scope_flags, " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", + (uint32_t)r.ARM_ip, (uint32_t)r.ARM_sp, (uint32_t)r.ARM_lr, + (uint32_t)r.ARM_pc, (uint32_t)r.ARM_cpsr); + +#ifdef WITH_VFP + struct user_vfp vfp_regs; + int i; + + if(ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) { + _LOG(log, scope_flags, "cannot get registers: %s\n", strerror(errno)); + return; + } + + for (i = 0; i < NUM_VFP_REGS; i += 2) { + _LOG(log, scope_flags, " d%-2d %016llx d%-2d %016llx\n", + i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]); + } + _LOG(log, scope_flags, " scr %08lx\n", vfp_regs.fpscr); +#endif +} |