win: Retrieve thread context for x64

snapshot/win/thread_snapshot_win.cc

Index: snapshot/win/thread_snapshot_win.cc
diff --git a/snapshot/win/thread_snapshot_win.cc b/snapshot/win/thread_snapshot_win.cc
index 689e79ca40aadef791ac06199ec935851b8883fb..83ad54efc3a59b87f23e9e9be983f88d055aad52 100644
--- a/snapshot/win/thread_snapshot_win.cc
+++ b/snapshot/win/thread_snapshot_win.cc
@@ -20,6 +20,55 @@
 namespace crashpad {
 namespace internal {
 
+namespace {
+
+void InitializeX64Context(const CONTEXT& context,
+                          CPUContextX86_64* out) {
+  out->rax = context.Rax;
+  out->rbx = context.Rbx;
+  out->rcx = context.Rcx;
+  out->rdx = context.Rdx;
+  out->rdi = context.Rdi;
+  out->rsi = context.Rsi;
+  out->rbp = context.Rbp;
+  out->rsp = context.Rsp;
+  out->r8 = context.R8;
+  out->r9 = context.R9;
+  out->r10 = context.R10;
+  out->r11 = context.R11;
+  out->r12 = context.R12;
+  out->r13 = context.R13;
+  out->r14 = context.R14;
+  out->r15 = context.R15;
+  out->rip = context.Rip;
+  out->rflags = context.EFlags;
+  out->cs = context.SegCs;
+  out->fs = context.SegFs;
+  out->gs = context.SegGs;
+
+  out->dr0 = context.Dr0;
+  out->dr1 = context.Dr1;
+  out->dr2 = context.Dr2;
+  out->dr3 = context.Dr3;
+  // DR4 and DR5 are obsolete synonyms for DR6 and DR7, see
+  // http://en.wikipedia.org/wiki/X86_debug_register.
+  out->dr4 = context.Dr6;
+  out->dr5 = context.Dr7;
+  out->dr6 = context.Dr6;
+  out->dr7 = context.Dr7;
+
+  static_assert(sizeof(out->fxsave) == sizeof(context.FltSave),
+                "types must be equivalent");
+  memcpy(&out->fxsave, &context.FltSave.ControlWord, sizeof(out->fxsave));
+}
+
+void InitializeX86Context(const CONTEXT& context,
+                          CPUContextX86* out) {
+  CHECK(false) << "TODO(scottmg) InitializeX86Context()";
+}
+
+}  // namespace
+
 ThreadSnapshotWin::ThreadSnapshotWin()
     : ThreadSnapshot(), context_(), stack_(), thread_(), initialized_() {
 }
@@ -36,13 +85,24 @@ bool ThreadSnapshotWin::Initialize(
   stack_.Initialize(
       process_reader, thread_.stack_region_address, thread_.stack_region_size);
 
+#if defined(ARCH_CPU_X86_FAMILY)
+  if (process_reader->Is64Bit()) {
+    context_.architecture = kCPUArchitectureX86_64;
+    context_.x86_64 = &context_union_.x86_64;
+    InitializeX64Context(process_reader_thread.context, context_.x86_64);
+  } else {
+    context_.architecture = kCPUArchitectureX86;
+    context_.x86 = &context_union_.x86;
+    InitializeX86Context(process_reader_thread.context, context_.x86);
+  }
+#endif
+
   INITIALIZATION_STATE_SET_VALID(initialized_);
   return true;
 }
 
 const CPUContext* ThreadSnapshotWin::Context() const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
-  LOG(ERROR) << "TODO(scottmg): CPUContext";
   return &context_;
 }