debuggerd: advance our amazing bet.

Remove debuggerd in favor of a helper process that gets execed by
crashing processes.

Bug: http://b/30705528
Test: debuggerd_test
Change-Id: I9906c69473989cbf7fe5ea6cccf9a9c563d75906

1 files changed, 62 insertions, 0 deletions

diff --git a/debuggerd/libdebuggerd/x86/machine.cpp b/debuggerd/libdebuggerd/x86/machine.cpp
new file mode 100644
index 000000000..af10817a4
--- /dev/null
+++ b/debuggerd/libdebuggerd/x86/machine.cpp
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "DEBUG"
+
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/ptrace.h>
+
+#include <backtrace/Backtrace.h>
+#include <log/log.h>
+
+#include "machine.h"
+#include "utility.h"
+
+void dump_memory_and_code(log_t* log, Backtrace* backtrace) {
+  struct pt_regs r;
+  if (ptrace(PTRACE_GETREGS, backtrace->Tid(), 0, &r) == -1) {
+    ALOGE("cannot get registers: %s\n", strerror(errno));
+    return;
+  }
+
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.eax), "memory near eax:");
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.ebx), "memory near ebx:");
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.ecx), "memory near ecx:");
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.edx), "memory near edx:");
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.esi), "memory near esi:");
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.edi), "memory near edi:");
+
+  dump_memory(log, backtrace, static_cast<uintptr_t>(r.eip), "code around eip:");
+}
+
+void dump_registers(log_t* log, pid_t tid) {
+  struct pt_regs r;
+  if (ptrace(PTRACE_GETREGS, tid, 0, &r) == -1) {
+    ALOGE("cannot get registers: %s\n", strerror(errno));
+    return;
+  }
+
+  _LOG(log, logtype::REGISTERS, "    eax %08lx  ebx %08lx  ecx %08lx  edx %08lx\n",
+       r.eax, r.ebx, r.ecx, r.edx);
+  _LOG(log, logtype::REGISTERS, "    esi %08lx  edi %08lx\n",
+       r.esi, r.edi);
+  _LOG(log, logtype::REGISTERS, "    xcs %08x  xds %08x  xes %08x  xfs %08x  xss %08x\n",
+       r.xcs, r.xds, r.xes, r.xfs, r.xss);
+  _LOG(log, logtype::REGISTERS, "    eip %08lx  ebp %08lx  esp %08lx  flags %08lx\n",
+       r.eip, r.ebp, r.esp, r.eflags);
+}