am b7fdf4fa: am 4077acd2: am 21be143a: Merge "Fix register dump and back trace after a crash."

#define R(x) (static_cast<unsigned int>(x))

// 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) {

  pt_regs r;

  pt_regs_mips_t r;

  if (ptrace(PTRACE_GETREGS, tid, 0, &r)) {

    return;

  }

}

void dump_registers(log_t* log, pid_t tid, int scope_flags) {

  pt_regs r;

  pt_regs_mips_t r;

  if(ptrace(PTRACE_GETREGS, tid, 0, &r)) {

    _LOG(log, scope_flags, "cannot get registers: %s\n", strerror(errno));

    return;