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..973ab3a8e5665f20207b6a080c58a00a855a8a63 100644
--- a/snapshot/win/thread_snapshot_win.cc
+++ b/snapshot/win/thread_snapshot_win.cc
@@ -20,6 +20,51 @@
 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;

[cpu_(ooo_6.6-7.5), 2015/05/12 01:06:50]

44 is the only one that breaks uniform naming... intended I assume.

[scottmg, 2015/05/12 19:37:05]

Do you mean the capitalization of the name? (This `CONTEXT` is from windows.h.)
Or that it's 'E' vs. 'R'? Even in x64, the EFlags register is only 32 bit. It
looks like on Mac/Mach, the system headers decided to extend it a uint64_t
anyway, so Crashpad has a 64 bit field there, but the Windows headers kept it as
a 32 bit value.

+  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;
+  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 +81,24 @@ 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_;
 }