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Diffstat (limited to 'debuggerd/arm/machine.cpp')
| -rw-r--r-- | debuggerd/arm/machine.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/debuggerd/arm/machine.cpp b/debuggerd/arm/machine.cpp new file mode 100644 index 0000000..3fba6db --- /dev/null +++ b/debuggerd/arm/machine.cpp @@ -0,0 +1,172 @@ +/* + * + * 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 <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, reinterpret_cast<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, static_cast<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, static_cast<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", + static_cast<uint32_t>(r.ARM_r0), static_cast<uint32_t>(r.ARM_r1), + static_cast<uint32_t>(r.ARM_r2), static_cast<uint32_t>(r.ARM_r3)); + _LOG(log, scope_flags, " r4 %08x r5 %08x r6 %08x r7 %08x\n", + static_cast<uint32_t>(r.ARM_r4), static_cast<uint32_t>(r.ARM_r5), + static_cast<uint32_t>(r.ARM_r6), static_cast<uint32_t>(r.ARM_r7)); + _LOG(log, scope_flags, " r8 %08x r9 %08x sl %08x fp %08x\n", + static_cast<uint32_t>(r.ARM_r8), static_cast<uint32_t>(r.ARM_r9), + static_cast<uint32_t>(r.ARM_r10), static_cast<uint32_t>(r.ARM_fp)); + _LOG(log, scope_flags, " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", + static_cast<uint32_t>(r.ARM_ip), static_cast<uint32_t>(r.ARM_sp), + static_cast<uint32_t>(r.ARM_lr), static_cast<uint32_t>(r.ARM_pc), + static_cast<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 +} |