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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 eax, [esp + 12] // ebx: PAL_SEHException *
mov ebx, [esp + 8] // eax: CONTEXT *
mov ebp, [ebx + CONTEXT_Ebp]
mov esp, [ebx + CONTEXT_Esp]
// 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 PAL_SEHException as the first argument
push eax
// Store return address to the stack
mov ebx, [ebx + CONTEXT_Eip]
push ebx
jmp EXTERNAL_C_FUNC(ThrowExceptionHelper)
LEAF_END ThrowExceptionFromContextInternal, _TEXT
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