52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/*
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* Copyright 2018, Jérôme Duval, jerome.duval@gmail.com.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _KERNEL_ARCH_x86_ALTCODEPATCH_H
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#define _KERNEL_ARCH_x86_ALTCODEPATCH_H
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#include <arch/x86/arch_kernel.h>
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#define ASM_NOP1 .byte 0x90
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#define ASM_NOP2 .byte 0x66, 0x90
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#define ASM_NOP3 .byte 0x0f, 0x1f, 0x00
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#define ASM_NOP4 .byte 0x0f, 0x1f, 0x40, 0x00
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#define ASM_NOP5 .byte 0x0f, 0x1f, 0x44, 0x00, 0x00
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#define ASM_NOP6 .byte 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00
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#define ASM_NOP7 .byte 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00
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#define ASM_NOP8 .byte 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
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#define ASM_NOP9 .byte 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00
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#ifdef _ASSEMBLER
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#define CODEPATCH_START 990:
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#define CODEPATCH_END(tag) 991: \
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.pushsection .altcodepatch, "a" ; \
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.long (990b - KERNEL_LOAD_BASE) ; \
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.short (991b - 990b) ; \
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.short tag ; \
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.popsection
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#else
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#define _STRINGIFY(x...) #x
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#define STRINGIFY(x...) _STRINGIFY(x)
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#define CODEPATCH_START "990: \n"
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#define CODEPATCH_END(tag) "991: \n" \
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".pushsection .altcodepatch, \"a\" \n" \
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".long (990b - " STRINGIFY(KERNEL_LOAD_BASE) ") \n" \
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".short (991b - 990b) \n" \
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".short " STRINGIFY(tag) " \n" \
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".popsection"
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void arch_altcodepatch_replace(uint16 tag, void* newcodepatch, size_t length);
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#endif
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#endif /* _KERNEL_ARCH_x86_ALTCODEPATCH_H */
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