diff options
Diffstat (limited to 'debuggerd/mips/machine.cpp')
| -rw-r--r-- | debuggerd/mips/machine.cpp | 138 |
1 files changed, 44 insertions, 94 deletions
diff --git a/debuggerd/mips/machine.cpp b/debuggerd/mips/machine.cpp index d1a7f2d..97834c7 100644 --- a/debuggerd/mips/machine.cpp +++ b/debuggerd/mips/machine.cpp @@ -22,141 +22,91 @@ #include <sys/types.h> #include <sys/ptrace.h> -#include <corkscrew/ptrace.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 - #define R(x) (static_cast<unsigned int>(x)) -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; - } - 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, scope_flags, " %s %s\n", code_buffer, ascii_buffer); - } -} +// The MIPS uapi ptrace.h has the wrong definition for pt_regs. PTRACE_GETREGS +// writes 64-bit quantities even though the public struct uses 32-bit ones. +struct pt_regs_mips_t { + uint64_t regs[32]; + uint64_t lo; + uint64_t hi; + uint64_t cp0_epc; + uint64_t cp0_badvaddr; + uint64_t cp0_status; + uint64_t cp0_cause; +}; // 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) { +void dump_memory_and_code(log_t* log, pid_t tid) { pt_regs_mips_t r; if (ptrace(PTRACE_GETREGS, tid, 0, &r)) { return; } - if (IS_AT_FAULT(scope_flags) && DUMP_MEMORY_FOR_ALL_REGISTERS) { - static const char REG_NAMES[] = "$0atv0v1a0a1a2a3t0t1t2t3t4t5t6t7s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra"; + 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; + 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]); + 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, scope_flags | SCOPE_SENSITIVE, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); - dump_memory(log, tid, addr, scope_flags | SCOPE_SENSITIVE); + // 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, logtype::MEMORY, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); + dump_memory(log, tid, addr); } unsigned int pc = R(r.cp0_epc); unsigned int ra = R(r.regs[31]); - _LOG(log, scope_flags, "\ncode around pc:\n"); - dump_memory(log, tid, (uintptr_t)pc, scope_flags); + _LOG(log, logtype::MEMORY, "\ncode around pc:\n"); + dump_memory(log, tid, (uintptr_t)pc); if (pc != ra) { - _LOG(log, scope_flags, "\ncode around ra:\n"); - dump_memory(log, tid, (uintptr_t)ra, scope_flags); + _LOG(log, logtype::MEMORY, "\ncode around ra:\n"); + dump_memory(log, tid, (uintptr_t)ra); } } -void dump_registers(log_t* log, pid_t tid, int scope_flags) { +void dump_registers(log_t* log, pid_t tid) { pt_regs_mips_t r; if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { - _LOG(log, scope_flags, "cannot get registers: %s\n", strerror(errno)); + _LOG(log, logtype::ERROR, "cannot get registers: %s\n", strerror(errno)); return; } - _LOG(log, scope_flags, " zr %08x at %08x v0 %08x v1 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " a0 %08x a1 %08x a2 %08x a3 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " t0 %08x t1 %08x t2 %08x t3 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " t4 %08x t5 %08x t6 %08x t7 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " s0 %08x s1 %08x s2 %08x s3 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " s4 %08x s5 %08x s6 %08x s7 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " t8 %08x t9 %08x k0 %08x k1 %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " gp %08x sp %08x s8 %08x ra %08x\n", + _LOG(log, logtype::REGISTERS, " 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, scope_flags, " hi %08x lo %08x bva %08x epc %08x\n", + _LOG(log, logtype::REGISTERS, " hi %08x lo %08x bva %08x epc %08x\n", R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc)); } |