From bef7e1f202d9676256ad8e187d83ce0b468b9614 Mon Sep 17 00:00:00 2001
From: Eric Pouech <eric.pouech@gmail.com>
Date: Tue, 19 Oct 2021 15:51:18 +0200
Subject: [PATCH] dbghelp: Start implementing StackWalkEx.

Simple copy of StackWalk implementation.

Signed-off-by: Eric Pouech <eric.pouech@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/dbghelp/dbghelp.spec |  2 +-
 dlls/dbghelp/stack.c      | 75 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 1 deletion(-)

diff --git a/dlls/dbghelp/dbghelp.spec b/dlls/dbghelp/dbghelp.spec
index e45ac48acb2..e96c2e0d3fd 100644
--- a/dlls/dbghelp/dbghelp.spec
+++ b/dlls/dbghelp/dbghelp.spec
@@ -32,7 +32,7 @@
 @ stdcall SearchTreeForFileW(wstr wstr ptr)
 @ stdcall StackWalk(long long long ptr ptr ptr ptr ptr ptr)
 @ stdcall StackWalk64(long long long ptr ptr ptr ptr ptr ptr)
-@ stub StackWalkEx
+@ stdcall StackWalkEx(long long long ptr ptr ptr ptr ptr ptr long)
 @ stub SymAddSourceStream
 @ stub SymAddSourceStreamA
 @ stub SymAddSourceStreamW
diff --git a/dlls/dbghelp/stack.c b/dlls/dbghelp/stack.c
index d04c0163c92..6c70fc805cb 100644
--- a/dlls/dbghelp/stack.c
+++ b/dlls/dbghelp/stack.c
@@ -245,6 +245,81 @@ BOOL WINAPI StackWalk64(DWORD MachineType, HANDLE hProcess, HANDLE hThread,
     return TRUE;
 }
 
+/* all the fields of STACKFRAME64 are present in STACKFRAME_EX at same offset
+ * So casting down a STACKFRAME_EX into a STACKFRAME64 is valid!
+ */
+C_ASSERT(sizeof(STACKFRAME64) == FIELD_OFFSET(STACKFRAME_EX, StackFrameSize));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, AddrPC) == FIELD_OFFSET(STACKFRAME_EX, AddrPC));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, AddrReturn) == FIELD_OFFSET(STACKFRAME_EX, AddrReturn));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, AddrFrame) == FIELD_OFFSET(STACKFRAME_EX, AddrFrame));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, AddrStack) == FIELD_OFFSET(STACKFRAME_EX, AddrStack));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, AddrBStore) == FIELD_OFFSET(STACKFRAME_EX, AddrBStore));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, FuncTableEntry) == FIELD_OFFSET(STACKFRAME_EX, FuncTableEntry));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, Params) == FIELD_OFFSET(STACKFRAME_EX, Params));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, Far) == FIELD_OFFSET(STACKFRAME_EX, Far));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, Virtual) == FIELD_OFFSET(STACKFRAME_EX, Virtual));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, Reserved) == FIELD_OFFSET(STACKFRAME_EX, Reserved));
+C_ASSERT(FIELD_OFFSET(STACKFRAME64, KdHelp) == FIELD_OFFSET(STACKFRAME_EX, KdHelp));
+
+/***********************************************************************
+ *		StackWalkEx (DBGHELP.@)
+ */
+BOOL WINAPI StackWalkEx(DWORD MachineType, HANDLE hProcess, HANDLE hThread,
+                        LPSTACKFRAME_EX frame, PVOID ctx,
+                        PREAD_PROCESS_MEMORY_ROUTINE64 f_read_mem,
+                        PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
+                        PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
+                        PTRANSLATE_ADDRESS_ROUTINE64 f_xlat_adr,
+                        DWORD flags)
+{
+    struct cpu_stack_walk       csw;
+    struct cpu*                 cpu;
+
+    TRACE("(%d, %p, %p, %p, %p, %p, %p, %p, %p, 0x%x)\n",
+          MachineType, hProcess, hThread, frame, ctx,
+          f_read_mem, FunctionTableAccessRoutine,
+          GetModuleBaseRoutine, f_xlat_adr, flags);
+
+    if (!(cpu = cpu_find(MachineType)))
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+    if (frame->StackFrameSize != sizeof(*frame))
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+    if (flags != 0)
+    {
+        FIXME("Unsupported yet flags 0x%x\n", flags);
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+    if (frame->InlineFrameContext != INLINE_FRAME_CONTEXT_IGNORE)
+    {
+        FIXME("Inlined contexts are not supported yet\n");
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+
+    csw.hProcess = hProcess;
+    csw.hThread = hThread;
+    csw.is32 = FALSE;
+    csw.cpu = cpu;
+    /* sigh... MS isn't even consistent in the func prototypes */
+    csw.u.s64.f_read_mem = (f_read_mem) ? f_read_mem : read_mem64;
+    csw.u.s64.f_xlat_adr = (f_xlat_adr) ? f_xlat_adr : addr_to_linear;
+    csw.u.s64.f_tabl_acs = (FunctionTableAccessRoutine) ? FunctionTableAccessRoutine : SymFunctionTableAccess64;
+    csw.u.s64.f_modl_bas = (GetModuleBaseRoutine) ? GetModuleBaseRoutine : SymGetModuleBase64;
+
+    if (!cpu->stack_walk(&csw, (STACKFRAME64*)frame, ctx)) return FALSE;
+
+    /* we don't handle KdHelp */
+
+    return TRUE;
+}
+
 /******************************************************************
  *		SymRegisterFunctionEntryCallback (DBGHELP.@)
  *