From 4ffd9fb3a0489ad93ab36d65298f056650120b25 Mon Sep 17 00:00:00 2001
From: Carlo Bramini <30959007+carlo-bramini@users.noreply.github.com>
Date: Sun, 25 Oct 2020 12:30:37 +0100
Subject: [PATCH] [DBGHELP] Add missing support for AMD64. (#3083)

See:
https://docs.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-context
---
 dll/win32/dbghelp/compat.h | 115 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 113 insertions(+), 2 deletions(-)

diff --git a/dll/win32/dbghelp/compat.h b/dll/win32/dbghelp/compat.h
index 2711bca953a..f7bef66bc91 100644
--- a/dll/win32/dbghelp/compat.h
+++ b/dll/win32/dbghelp/compat.h
@@ -335,11 +335,120 @@ typedef struct _CONTEXT {
   DWORD Esp;
   DWORD SegSs;
   BYTE ExtendedRegisters[MAXIMUM_SUPPORTED_EXTENSION];
-} CONTEXT, *PCONTEXT;
+} CONTEXT;
 
 #elif defined TARGET_amd64
 
-#error "Please define the CONTEXT structure for amd64 platform"
+typedef struct _M128A {
+    ULONGLONG Low;
+    LONGLONG High;
+} M128A, *PM128A;
+
+typedef struct _XMM_SAVE_AREA32 {
+    WORD ControlWord;
+    WORD StatusWord;
+    BYTE TagWord;
+    BYTE Reserved1;
+    WORD ErrorOpcode;
+    DWORD ErrorOffset;
+    WORD ErrorSelector;
+    WORD Reserved2;
+    DWORD DataOffset;
+    WORD DataSelector;
+    WORD Reserved3;
+    DWORD MxCsr;
+    DWORD MxCsr_Mask;
+    M128A FloatRegisters[8];
+    M128A XmmRegisters[16];
+    BYTE Reserved4[96];
+} XMM_SAVE_AREA32, *PXMM_SAVE_AREA32;
+
+typedef struct _CONTEXT {
+    DWORD64 P1Home;
+    DWORD64 P2Home;
+    DWORD64 P3Home;
+    DWORD64 P4Home;
+    DWORD64 P5Home;
+    DWORD64 P6Home;
+
+    /* Control flags */
+    DWORD ContextFlags;
+    DWORD MxCsr;
+
+    /* Segment */
+    WORD SegCs;
+    WORD SegDs;
+    WORD SegEs;
+    WORD SegFs;
+    WORD SegGs;
+    WORD SegSs;
+    DWORD EFlags;
+
+    /* Debug */
+    DWORD64 Dr0;
+    DWORD64 Dr1;
+    DWORD64 Dr2;
+    DWORD64 Dr3;
+    DWORD64 Dr6;
+    DWORD64 Dr7;
+
+    /* Integer */
+    DWORD64 Rax;
+    DWORD64 Rcx;
+    DWORD64 Rdx;
+    DWORD64 Rbx;
+    DWORD64 Rsp;
+    DWORD64 Rbp;
+    DWORD64 Rsi;
+    DWORD64 Rdi;
+    DWORD64 R8;
+    DWORD64 R9;
+    DWORD64 R10;
+    DWORD64 R11;
+    DWORD64 R12;
+    DWORD64 R13;
+    DWORD64 R14;
+    DWORD64 R15;
+
+    /* Counter */
+    DWORD64 Rip;
+
+   /* Floating point */
+   union {
+       XMM_SAVE_AREA32 FltSave;
+       struct {
+           M128A Header[2];
+           M128A Legacy[8];
+           M128A Xmm0;
+           M128A Xmm1;
+           M128A Xmm2;
+           M128A Xmm3;
+           M128A Xmm4;
+           M128A Xmm5;
+           M128A Xmm6;
+           M128A Xmm7;
+           M128A Xmm8;
+           M128A Xmm9;
+           M128A Xmm10;
+           M128A Xmm11;
+           M128A Xmm12;
+           M128A Xmm13;
+           M128A Xmm14;
+           M128A Xmm15;
+      } DUMMYSTRUCTNAME;
+    } DUMMYUNIONNAME;
+
+     /* Vector */
+    M128A VectorRegister[26];
+    DWORD64 VectorControl;
+
+    /* Debug control */
+    DWORD64 DebugControl;
+    DWORD64 LastBranchToRip;
+    DWORD64 LastBranchFromRip;
+    DWORD64 LastExceptionToRip;
+    DWORD64 LastExceptionFromRip;
+} CONTEXT;
 
 #elif defined TARGET_arm /* ARM? */
 
@@ -446,6 +555,8 @@ PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry(ULONG_PTR,DWORD*,UNWIND_HISTORY_
 
 #endif
 
+typedef CONTEXT *PCONTEXT;
+
 typedef
 EXCEPTION_DISPOSITION
 NTAPI