[x86/Linux][SOS] Fix clrstack command of lldb sosplugin on x86 (#13973)

* [x86/Linux][SOS] Add support for x86 in GetContextFromFrame

It's need for 'clrstack -f' command of SOS plugin on x86.

* [x86/Linux] Fix RtlpGetFunctionEndAddress function

We should use PTR_UNWIND_INFO instead of PUNWIND_INFO for pointer to
UNWIND_INFO structure because it's pointer from other process and
we need to use DAC to read data using it.

* [x86/Linux][SOS] Define DEBUG_STACK_CONTEXT for x86

It's needed for 'clrstack -f' command in libsosplugin.

* [x86/Linux] Fix undefined references in libmscordbi.so on x86

Asm block like following:
__asm fnsave currentFPUState

where currentFPUState is structure works with MSVC but leads to
undefined reference currentFPUState in the binary with other
compilers. So rewrite such asm blocks for them.

This patch fixes error "Unable to load 'libmscordbi.so'" during
execution of 'clrstack -f' command of SOS plugin on x86.

* [x86/Linux] Fix calling convention inconsistency

WINAPI and STDAPI are defined as __cdecl but in some cases functions
with these attributes are called using stdcall calling convention.

It leads to crashes during execution of 'clrstack -i' command of
SOS plugin on x86.

2 files changed, 22 insertions, 1 deletions

diff --git a/src/ToolBox/SOS/Strike/strike.cpp b/src/ToolBox/SOS/Strike/strike.cpp
index 6963cffe29..5ab45d5dca 100644
--- a/src/ToolBox/SOS/Strike/strike.cpp
+++ b/src/ToolBox/SOS/Strike/strike.cpp
@@ -324,7 +324,9 @@ DECLARE_API(IP2MD)
 #define DEBUG_STACK_CONTEXT AMD64_CONTEXT
 #elif defined(_TARGET_ARM_) // _TARGET_WIN64_
 #define DEBUG_STACK_CONTEXT ARM_CONTEXT
-#endif // _TARGET_ARM_
+#elif defined(_TARGET_X86_) // _TARGET_ARM_
+#define DEBUG_STACK_CONTEXT X86_CONTEXT
+#endif // _TARGET_X86_
 
 #ifdef DEBUG_STACK_CONTEXT
 // I use a global set of frames for stack walking on win64 because the debugger's
diff --git a/src/ToolBox/SOS/lldbplugin/services.cpp b/src/ToolBox/SOS/lldbplugin/services.cpp
index d0ea7bced9..3186920eb0 100644
--- a/src/ToolBox/SOS/lldbplugin/services.cpp
+++ b/src/ToolBox/SOS/lldbplugin/services.cpp
@@ -1577,6 +1577,25 @@ LLDBServices::GetContextFromFrame(
     dtcontext->R10 = GetRegister(frame, "r10");
     dtcontext->R11 = GetRegister(frame, "r11");
     dtcontext->R12 = GetRegister(frame, "r12");
+#elif DBG_TARGET_X86
+    dtcontext->Eip = frame.GetPC();
+    dtcontext->Esp = frame.GetSP();
+    dtcontext->Ebp = frame.GetFP();
+    dtcontext->EFlags = GetRegister(frame, "eflags");
+
+    dtcontext->Edi = GetRegister(frame, "edi");
+    dtcontext->Esi = GetRegister(frame, "esi");
+    dtcontext->Ebx = GetRegister(frame, "ebx");
+    dtcontext->Edx = GetRegister(frame, "edx");
+    dtcontext->Ecx = GetRegister(frame, "ecx");
+    dtcontext->Eax = GetRegister(frame, "eax");
+
+    dtcontext->SegCs = GetRegister(frame, "cs");
+    dtcontext->SegSs = GetRegister(frame, "ss");
+    dtcontext->SegDs = GetRegister(frame, "ds");
+    dtcontext->SegEs = GetRegister(frame, "es");
+    dtcontext->SegFs = GetRegister(frame, "fs");
+    dtcontext->SegGs = GetRegister(frame, "gs");
 #endif
 }