[x86/Linux] Remove unnecessary ResumeEsp field (#11167)

Author: parjong

src/pal/inc/pal.h

@@ -1783,8 +1783,6 @@ typedef struct _CONTEXT {
     ULONG   SegSs;
 
     UCHAR   ExtendedRegisters[MAXIMUM_SUPPORTED_EXTENSION];
-
-    ULONG   ResumeEsp;
 } CONTEXT, *PCONTEXT, *LPCONTEXT;
 
 // To support saving and loading xmm register context we need to know the offset in the ExtendedRegisters

src/pal/src/arch/i386/asmconstants.h

@@ -28,4 +28,3 @@
 #define CONTEXT_Xmm5 CONTEXT_Xmm4+16
 #define CONTEXT_Xmm6 CONTEXT_Xmm5+16
 #define CONTEXT_Xmm7 CONTEXT_Xmm6+16
-#define CONTEXT_ResumeEsp CONTEXT_ExtendedRegisters+512

src/pal/src/arch/i386/context2.S

@@ -42,7 +42,6 @@ LEAF_ENTRY CONTEXT_CaptureContext, _TEXT
     mov   [eax + CONTEXT_Ebp], ebp
     lea   ebx, [esp + 12]
     mov   [eax + CONTEXT_Esp], ebx
-    mov   [eax + CONTEXT_ResumeEsp], ebx
     mov   ebx, [esp + 8]
     mov   [eax + CONTEXT_Eip], ebx
 
@@ -115,7 +114,7 @@ LOCAL_LABEL(Done_Restore_CONTEXT_FLOATING_POINT):
 LOCAL_LABEL(Done_Restore_CONTEXT_EXTENDED_REGISTERS):
 
     // Restore Stack
-    mov   esp, [eax + CONTEXT_ResumeEsp]
+    mov   esp, [eax + CONTEXT_Esp]
 
     // Create a minimal frame
     push  DWORD PTR [eax + CONTEXT_Eip]

src/pal/src/arch/i386/exceptionhelper.S

@@ -23,7 +23,7 @@ LEAF_ENTRY ThrowExceptionFromContextInternal, _TEXT
         mov   eax, [esp + 8]  // ebx: CONTEXT *
 
         mov   ebp, [eax + CONTEXT_Ebp]
-        mov   esp, [eax + CONTEXT_ResumeEsp]
+        mov   esp, [eax + CONTEXT_Esp]
         mov   ebx, [eax + CONTEXT_Ebx]
         mov   esi, [eax + CONTEXT_Esi]
         mov   edi, [eax + CONTEXT_Edi]

src/pal/src/arch/i386/signalhandlerhelper.cpp

@@ -70,7 +70,6 @@ void ExecuteHandlerOnOriginalStack(int code, siginfo_t *siginfo, void *context,
     // We don't care about the other registers state since the stack unwinding restores
     // them for the target frame directly from the signal context.
     context2.Esp = (size_t)sp;
-    context2.ResumeEsp = (size_t)sp;
     context2.Ebp = (size_t)fp;
     context2.Eip = (size_t)signal_handler_worker;
 

src/pal/src/exception/seh-unwind.cpp

@@ -155,7 +155,6 @@ static void UnwindContextToWinContext(unw_cursor_t *cursor, CONTEXT *winContext)
 #elif defined(_X86_)
     unw_get_reg(cursor, UNW_REG_IP, (unw_word_t *) &winContext->Eip);
     unw_get_reg(cursor, UNW_REG_SP, (unw_word_t *) &winContext->Esp);
-    unw_get_reg(cursor, UNW_REG_SP, (unw_word_t *) &winContext->ResumeEsp);
     unw_get_reg(cursor, UNW_X86_EBP, (unw_word_t *) &winContext->Ebp);
     unw_get_reg(cursor, UNW_X86_EBX, (unw_word_t *) &winContext->Ebx);
     unw_get_reg(cursor, UNW_X86_ESI, (unw_word_t *) &winContext->Esi);

src/pal/src/thread/context.cpp

@@ -506,8 +506,6 @@ void CONTEXTFromNativeContext(const native_context_t *native, LPCONTEXT lpContex
         // although the pc value retrived from native context might not have set the least bit.
         // This becomes especially problematic if the context is on the JIT_WRITEBARRIER.
         lpContext->Pc |= 0x1;
-#elif defined(_X86_)
-        lpContext->ResumeEsp = MCREG_Esp(native->uc_mcontext);
 #endif
     }
 
@@ -978,7 +976,6 @@ CONTEXT_GetThreadContextFromThreadState(
                 lpContext->Esi = pState->esi;
                 lpContext->Ebp = pState->ebp;
                 lpContext->Esp = pState->esp;
-                lpContext->ResumeEsp = pState->esp;
                 lpContext->SegSs = pState->ss;
                 lpContext->EFlags = pState->eflags;
                 lpContext->Eip = pState->eip;

src/unwinder/i386/unwinder_i386.cpp

@@ -105,21 +105,7 @@ OOPStackUnwinderX86::VirtualUnwind(
     ENUM_CALLEE_SAVED_REGISTERS();
 #undef CALLEE_SAVED_REGISTER
 
-    SIZE_T paramSize = codeInfo.GetCodeManager()->GetStackParameterSize(&codeInfo);
-    SIZE_T paddingSize = 0;
-
-#ifdef UNIX_X86_ABI
-    // On UNIX_X86_ABI, function call may have stack alignment padding.
-    if (paramSize % 16 != 0)
-    {
-        paddingSize += 16 - (paramSize % 16);
-    }
-#endif // UNIX_X86_ABI
-
-    ContextRecord->Esp = rd.SP - paramSize;
-    ContextRecord->ResumeEsp = ExecutionManager::IsManagedCode((PCODE) rd.ControlPC)
-                             ? rd.SP + paddingSize
-                             : ContextRecord->Esp;
+    ContextRecord->Esp = rd.SP - codeInfo.GetCodeManager()->GetStackParameterSize(&codeInfo);
     ContextRecord->Eip = rd.ControlPC;
 
     // For x86, the value of Establisher Frame Pointer is Caller SP

src/vm/exceptionhandling.cpp

@@ -135,7 +135,7 @@ void FixContext(PCONTEXT pContextRecord)
 
 #ifdef _TARGET_X86_
     size_t resumeSp = EECodeManager::GetResumeSp(pContextRecord);
-    FIXUPREG(ResumeEsp, resumeSp);
+    FIXUPREG(Esp, resumeSp);
 #endif // _TARGET_X86_
 
 #undef FIXUPREG

src/vm/i386/cgenx86.cpp

@@ -331,7 +331,6 @@ void TransitionFrame::UpdateRegDisplayHelper(const PREGDISPLAY pRD, UINT cbStack
 
     pRD->pCurrentContext->Eip = *PTR_PCODE(pRD->PCTAddr);;
     pRD->pCurrentContext->Esp = CallerSP;
-    pRD->pCurrentContext->ResumeEsp = CallerSP + cbStackPop;
 
     UpdateRegDisplayFromCalleeSavedRegisters(pRD, regs);
     ClearRegDisplayArgumentAndScratchRegisters(pRD);
@@ -384,7 +383,7 @@ void HelperMethodFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
 #endif // DACCESS_COMPILE
 
     pRD->pCurrentContext->Eip = pRD->ControlPC = m_MachState.GetRetAddr();
-    pRD->pCurrentContext->Esp = pRD->pCurrentContext->ResumeEsp = pRD->SP = (DWORD) m_MachState.esp();
+    pRD->pCurrentContext->Esp = pRD->SP = (DWORD) m_MachState.esp();
 
 #define CALLEE_SAVED_REGISTER(regname) pRD->pCurrentContext->regname = *((DWORD*) m_MachState.p##regname());
     ENUM_CALLEE_SAVED_REGISTERS();
@@ -689,7 +688,6 @@ void InlinedCallFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
 
     pRD->pCurrentContext->Eip = *PTR_PCODE(pRD->PCTAddr);
     pRD->pCurrentContext->Esp = (DWORD) dac_cast<TADDR>(m_pCallSiteSP);
-    pRD->pCurrentContext->ResumeEsp = (DWORD) dac_cast<TADDR>(m_pCallSiteSP) + stackArgSize;
     pRD->pCurrentContext->Ebp = (DWORD) m_pCalleeSavedFP;
 
     ClearRegDisplayArgumentAndScratchRegisters(pRD);
@@ -829,7 +827,7 @@ void HijackFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
     pRD->IsCallerSPValid      = FALSE;        // Don't add usage of this field.  This is only temporary.
 
     pRD->pCurrentContext->Eip = *PTR_PCODE(pRD->PCTAddr);
-    pRD->pCurrentContext->Esp = pRD->pCurrentContext->ResumeEsp = (DWORD)(pRD->PCTAddr + sizeof(TADDR));
+    pRD->pCurrentContext->Esp = (DWORD)(pRD->PCTAddr + sizeof(TADDR));
 
 #define RESTORE_REG(reg) { pRD->pCurrentContext->reg = m_Args->reg; pRD->pCurrentContextPointers->reg = &m_Args->reg; }
 #define CALLEE_SAVED_REGISTER(reg) RESTORE_REG(reg)
@@ -908,7 +906,7 @@ void TailCallFrame::UpdateRegDisplay(const PREGDISPLAY pRD)
     pRD->IsCallerSPValid      = FALSE;        // Don't add usage of this field.  This is only temporary.
 
     pRD->pCurrentContext->Eip = *PTR_PCODE(pRD->PCTAddr);
-    pRD->pCurrentContext->Esp = pRD->pCurrentContext->ResumeEsp = (DWORD)(pRD->PCTAddr + sizeof(TADDR));
+    pRD->pCurrentContext->Esp = (DWORD)(pRD->PCTAddr + sizeof(TADDR));
 
     UpdateRegDisplayFromCalleeSavedRegisters(pRD, &m_regs);
     ClearRegDisplayArgumentAndScratchRegisters(pRD);