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author | Chris Dearman <chris@mips.com> | 2012-08-10 17:06:20 -0700 |
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committer | Raghu Gandham <raghu@mips.com> | 2012-08-10 18:16:20 -0700 |
commit | 231e3c83a3a70b11160fb0da108ebf2e0e7470e2 (patch) | |
tree | 0469db2e9a4118ffdd3eacfa096286adf45d4a8b /debuggerd/mips | |
parent | 7b682c4787e06be193ac3d2a1071e0feb5e4ba58 (diff) | |
download | system_core-231e3c83a3a70b11160fb0da108ebf2e0e7470e2.zip system_core-231e3c83a3a70b11160fb0da108ebf2e0e7470e2.tar.gz system_core-231e3c83a3a70b11160fb0da108ebf2e0e7470e2.tar.bz2 |
[MIPS] debuggerd and libcorkscrew support
Change-Id: I5a241dc2e470148be0ad2c138e31f1aba5ab8812
Diffstat (limited to 'debuggerd/mips')
-rw-r--r-- | debuggerd/mips/crashglue.S | 48 | ||||
-rw-r--r-- | debuggerd/mips/machine.c | 178 |
2 files changed, 226 insertions, 0 deletions
diff --git a/debuggerd/mips/crashglue.S b/debuggerd/mips/crashglue.S new file mode 100644 index 0000000..70a6641 --- /dev/null +++ b/debuggerd/mips/crashglue.S @@ -0,0 +1,48 @@ + .set noat + + .globl crash1 + .globl crashnostack + +crash1: + li $0,0xdead0000+0 + li $1,0xdead0000+1 + li $2,0xdead0000+2 + li $3,0xdead0000+3 + li $4,0xdead0000+4 + li $5,0xdead0000+5 + li $6,0xdead0000+6 + li $7,0xdead0000+7 + li $8,0xdead0000+8 + li $9,0xdead0000+9 + li $10,0xdead0000+10 + li $11,0xdead0000+11 + li $12,0xdead0000+12 + li $13,0xdead0000+13 + li $14,0xdead0000+14 + li $15,0xdead0000+15 + li $16,0xdead0000+16 + li $17,0xdead0000+17 + li $18,0xdead0000+18 + li $19,0xdead0000+19 + li $20,0xdead0000+20 + li $21,0xdead0000+21 + li $22,0xdead0000+22 + li $23,0xdead0000+23 + li $24,0xdead0000+24 + li $25,0xdead0000+25 + li $26,0xdead0000+26 + li $27,0xdead0000+27 + li $28,0xdead0000+28 + # don't trash the stack otherwise the signal handler won't run + #li $29,0xdead0000+29 + li $30,0xdead0000+30 + li $31,0xdead0000+31 + + lw $zero,($0) + b . + + +crashnostack: + li $sp, 0 + lw $zero,($0) + b . diff --git a/debuggerd/mips/machine.c b/debuggerd/mips/machine.c new file mode 100644 index 0000000..dba1711 --- /dev/null +++ b/debuggerd/mips/machine.c @@ -0,0 +1,178 @@ +/* system/debuggerd/debuggerd.c +** +** Copyright 2012, 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 <stddef.h> +#include <stdbool.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <errno.h> +#include <sys/types.h> +#include <sys/ptrace.h> + +#include <corkscrew/ptrace.h> + +#include <linux/user.h> + +#include "../utility.h" +#include "../machine.h" + +/* enable to dump memory pointed to by every register */ +#define DUMP_MEMORY_FOR_ALL_REGISTERS 1 + +#define R(x) ((unsigned int)(x)) + +static void dump_memory(log_t* log, pid_t tid, uintptr_t addr, bool at_fault) { + 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; + } + end = p + 80; + /* 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); + + 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++ = '.'; + } + } + p += 4; + } + *asc_out = '\0'; + _LOG(log, !at_fault, " %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(const ptrace_context_t* context __attribute((unused)), + log_t* log, pid_t tid, bool at_fault) { + pt_regs_mips_t r; + if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { + return; + } + + if (at_fault && DUMP_MEMORY_FOR_ALL_REGISTERS) { + static const char REG_NAMES[] = "$0atv0v1a0a1a2a3t0t1t2t3t4t5t6t7s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra"; + + for (int reg = 0; reg < 32; reg++) { + /* skip uninteresting registers */ + if (reg == 0 /* $0 */ + || reg == 26 /* $k0 */ + || reg == 27 /* $k1 */ + || reg == 31 /* $ra (done below) */ + ) + continue; + + uintptr_t addr = R(r.regs[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 >= 0x80000000) { + continue; + } + + _LOG(log, false, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); + dump_memory(log, tid, addr, at_fault); + } + } + + unsigned int pc = R(r.cp0_epc); + unsigned int ra = R(r.regs[31]); + + _LOG(log, !at_fault, "\ncode around pc:\n"); + dump_memory(log, tid, (uintptr_t)pc, at_fault); + + if (pc != ra) { + _LOG(log, !at_fault, "\ncode around ra:\n"); + dump_memory(log, tid, (uintptr_t)ra, at_fault); + } +} + +void dump_registers(const ptrace_context_t* context __attribute((unused)), + log_t* log, pid_t tid, bool at_fault) +{ + pt_regs_mips_t r; + bool only_in_tombstone = !at_fault; + + if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { + _LOG(log, only_in_tombstone, "cannot get registers: %s\n", strerror(errno)); + return; + } + + _LOG(log, only_in_tombstone, " zr %08x at %08x v0 %08x v1 %08x\n", + R(r.regs[0]), R(r.regs[1]), R(r.regs[2]), R(r.regs[3])); + _LOG(log, only_in_tombstone, " a0 %08x a1 %08x a2 %08x a3 %08x\n", + R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7])); + _LOG(log, only_in_tombstone, " t0 %08x t1 %08x t2 %08x t3 %08x\n", + R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11])); + _LOG(log, only_in_tombstone, " t4 %08x t5 %08x t6 %08x t7 %08x\n", + R(r.regs[12]), R(r.regs[13]), R(r.regs[14]), R(r.regs[15])); + _LOG(log, only_in_tombstone, " s0 %08x s1 %08x s2 %08x s3 %08x\n", + R(r.regs[16]), R(r.regs[17]), R(r.regs[18]), R(r.regs[19])); + _LOG(log, only_in_tombstone, " s4 %08x s5 %08x s6 %08x s7 %08x\n", + R(r.regs[20]), R(r.regs[21]), R(r.regs[22]), R(r.regs[23])); + _LOG(log, only_in_tombstone, " t8 %08x t9 %08x k0 %08x k1 %08x\n", + R(r.regs[24]), R(r.regs[25]), R(r.regs[26]), R(r.regs[27])); + _LOG(log, only_in_tombstone, " gp %08x sp %08x s8 %08x ra %08x\n", + R(r.regs[28]), R(r.regs[29]), R(r.regs[30]), R(r.regs[31])); + _LOG(log, only_in_tombstone, " hi %08x lo %08x bva %08x epc %08x\n", + R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc)); +} |