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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.
#include "unixasmmacros.inc"
#include "asmconstants.h"
.syntax unified
.thumb
.macro CALL_SIGNAL_HANDLER_WRAPPER Alignment
.globl C_FUNC(SignalHandlerWorkerReturnOffset\Alignment)
C_FUNC(SignalHandlerWorkerReturnOffset\Alignment):
.int LOCAL_LABEL(SignalHandlerWorkerReturn\Alignment)-C_FUNC(CallSignalHandlerWrapper\Alignment)
// This function is never called, only a fake stack frame will be setup to have a return
// address set to SignalHandlerWorkerReturn during SIGSEGV handling.
// It enables the unwinder to unwind stack from the handling code to the actual failure site.
NESTED_ENTRY CallSignalHandlerWrapper\Alignment, _TEXT, NoHandler
#ifndef __linux__
__StackAllocationSize = (8 + 4 + \Alignment) // red zone + alignment
alloc_stack __StackAllocationSize
PROLOG_PUSH "{r7, r11, lr}"
bl EXTERNAL_C_FUNC(signal_handler_worker)
LOCAL_LABEL(SignalHandlerWorkerReturn\Alignment):
EPILOG_POP "{r7, r11, lr}"
free_stack __StackAllocationSize
bx lr
#else
// This unwind information is needed for lldb gdb doesn't use it and tries
// to read all registers from $sp + 12
.save {r0-r15}
.pad #12
bl EXTERNAL_C_FUNC(signal_handler_worker)
LOCAL_LABEL(SignalHandlerWorkerReturn\Alignment):
// Following instruction are needed to say gdb that this frame is SIGTRAMP_FRAME
// and it can restore all registers from stack
mov.w r7, #119
svc 0
#endif
NESTED_END CallSignalHandlerWrapper\Alignment, _TEXT
.endm
CALL_SIGNAL_HANDLER_WRAPPER 0
CALL_SIGNAL_HANDLER_WRAPPER 4
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