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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
.intel_syntax noprefix
#include "unixasmmacros.inc"
#include "asmconstants.h"
//////////////////////////////////////////////////////////////////////////
//
// EXTERN_C void ThrowExceptionFromContextInternal(CONTEXT* context, PAL_SEHException* ex);
//
// This function creates a stack frame right below the target frame, restores all callee
// saved registers from the passed in context, sets the SP to that frame and sets the
// return address to the target frame's IP.
// Then it uses the ThrowExceptionHelper to throw the passed in exception from that context.
//
//////////////////////////////////////////////////////////////////////////
LEAF_ENTRY ThrowExceptionFromContextInternal, _TEXT
push ebp
mov ecx, [esp + 12] // ecx: PAL_SEHException * (first argument for ThrowExceptionHelper)
mov eax, [esp + 8] // ebx: CONTEXT *
mov ebp, [eax + CONTEXT_Ebp]
mov esp, [eax + CONTEXT_ResumeEsp]
mov ebx, [eax + CONTEXT_Ebx]
mov esi, [eax + CONTEXT_Esi]
mov edi, [eax + CONTEXT_Edi]
// The ESP is re-initialized as the target frame's value, so the current function's
// CFA is now right at the ESP.
.cfi_def_cfa_offset 0
// Indicate that now that we have moved the RSP to the target address,
// the EBP is no longer saved in the current stack frame.
.cfi_restore ebp
// Store return address to the stack
mov eax, [eax + CONTEXT_Eip]
push eax
jmp EXTERNAL_C_FUNC(ThrowExceptionHelper)
LEAF_END ThrowExceptionFromContextInternal, _TEXT
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