86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef X86_EXCEPTION_H
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#define X86_EXCEPTION_H
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#ifndef _ASMLANGUAGE
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#include <toolchain/common.h>
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#define _EXCEPTION_INTLIST(vector) \
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".pushsection .gnu.linkonce.intList.exc_" #vector "\n\t" \
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".long 1f\n\t" /* ISR_LIST.fnc */ \
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".long -1\n\t" /* ISR_LIST.irq */ \
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".long -1\n\t" /* ISR_LIST.priority */ \
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".long " STRINGIFY(vector) "\n\t" /* ISR_LIST.vec */ \
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".long 0\n\t" /* ISR_LIST.dpl */ \
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".popsection\n\t" \
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/* Extra preprocessor indirection to ensure arguments get expanded before
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* concatenation takes place
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*/
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#define __EXCEPTION_STUB_NAME(handler, vec) \
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_ ## handler ## _vector_ ## vec ## _stub
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#define _EXCEPTION_STUB_NAME(handler, vec) \
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__EXCEPTION_STUB_NAME(handler, vec) \
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/* Unfortunately, GCC extended asm doesn't work at toplevel so we need
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* to stringify stuff.
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*
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* What we are doing here is generating entires in the .intList section
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* and also the assembly language stubs for the exception. We use
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* .gnu.linkonce section prefix so that the linker only includes the
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* first one of these it encounters for a particular vector. In this
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* way it's easy for applications or drivers to install custom exception
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* handlers without having to #ifdef out previous instances such as in
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* arch/x86/core/fatal.c
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*/
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#define __EXCEPTION_CONNECT(handler, vector, codepush) \
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__asm__ ( \
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_EXCEPTION_INTLIST(vector) \
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".pushsection .gnu.linkonce.t.exc_" STRINGIFY(vector) \
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"_stub, \"ax\"\n\t" \
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".global " STRINGIFY(_EXCEPTION_STUB_NAME(handler, vector)) "\n\t" \
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STRINGIFY(_EXCEPTION_STUB_NAME(handler, vector)) ":\n\t" \
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"1:\n\t" \
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codepush \
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"push $" STRINGIFY(handler) "\n\t" \
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"jmp _exception_enter\n\t" \
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".popsection\n\t" \
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)
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/**
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* @brief Connect an exception handler that doesn't expect error code
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*
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* Assign an exception handler to a particular vector in the IDT.
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*
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* @param handler A handler function of the prototype
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* void handler(const NANO_ESF *esf)
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* @param vector Vector index in the IDT
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*/
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#define _EXCEPTION_CONNECT_NOCODE(handler, vector) \
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__EXCEPTION_CONNECT(handler, vector, "push $0\n\t")
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/**
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* @brief Connect an exception handler that does expect error code
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*
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* Assign an exception handler to a particular vector in the IDT.
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* The error code will be accessible in esf->errorCode
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*
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* @param handler A handler function of the prototype
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* void handler(const NANO_ESF *esf)
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* @param vector Vector index in the IDT
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*/
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#define _EXCEPTION_CONNECT_CODE(handler, vector) \
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__EXCEPTION_CONNECT(handler, vector, "")
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#endif /* _ASMLANGUAGE */
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#endif /* X86_EXCEPTION_H */
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