134 lines
3.0 KiB
NASM
134 lines
3.0 KiB
NASM
;
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; @file EfiAsm.asm
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;
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; @brief EFI specific MASM-written functions.
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;
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; @author Satoshi Tanda
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;
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; @copyright Copyright (c) 2020 - , Satoshi Tanda. All rights reserved.
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;
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include AsmCommon.inc
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.code
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extern HandleHostException : proc
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;
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; The index to track an interrupt number for generating AsmDefaultExceptionHandlers.
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;
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Index = 0
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;
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; Generates the default exception handler code for the given interrupt/exception
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; number. The generated code assumes that the interrupt/exception does not push
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; error code.
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;
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; Index is incremented whenever this macro is used.
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;
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INTERRUPT_HANDLER macro InterruptNumber
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;
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; Push dummy error code for consistent stack layout.
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;
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push 0
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push InterruptNumber
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jmp AsmCommonExceptionHandler
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Index = Index + 1
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endm
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;
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; Generates the default exception handler code for the given interrupt/exception
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; number. The generated code assumes that the interrupt/exception pushes error code.
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;
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; Index is incremented whenever this macro is used.
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;
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INTERRUPT_HANDLER_WITH_CODE macro InterruptNumber
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;
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; Error code is expected to be pushed by the processor.
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;
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nop
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nop
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push InterruptNumber
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jmp AsmCommonExceptionHandler
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Index = Index + 1
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endm
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;
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; @brief The default host exception handlers.
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;
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; @details This is the function containing actually 256 stub functions generated
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; with the INTERRUPT_HANDLER and INTERRUPT_HANDLER_WITH_CODE macros. Each function
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; works as a hendler of the corresponding interrupt/exception in the host.
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;
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AsmDefaultExceptionHandlers proc
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;
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; INT0-7
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;
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repeat 8
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INTERRUPT_HANDLER Index
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endm
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;
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; INT8, INT9
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;
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INTERRUPT_HANDLER_WITH_CODE Index
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INTERRUPT_HANDLER Index
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;
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; INT10-14
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;
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repeat 5
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INTERRUPT_HANDLER_WITH_CODE Index
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endm
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;
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; INT15-16
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;
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repeat 2
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INTERRUPT_HANDLER Index
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endm
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;
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; INT17
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;
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INTERRUPT_HANDLER_WITH_CODE Index
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;
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; INT18-255
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;
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repeat 238
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INTERRUPT_HANDLER Index
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endm
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AsmDefaultExceptionHandlers endp
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;
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; @brief The common logic for the exception handlers.
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;
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; @details This function pushes register values into the stack and calls the
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; high-level handler written in C.
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;
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AsmCommonExceptionHandler proc
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PUSHAQ
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mov rcx, rsp
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sub rsp, 20h
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call HandleHostException
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add rsp, 20h
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POPAQ
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;
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; Remove the error code and interrupt number.
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;
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add rsp, 10h
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iretq
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AsmCommonExceptionHandler endp
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;
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; @brief The NMI handler for the host.
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;
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; @details This implementation is incomplete. When NMI occurs while the host is
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; executed, it should be injected to the guest.
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;
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AsmNmiExceptionHandler proc
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iretq
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AsmNmiExceptionHandler endp
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end
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