mirror of
https://github.com/reactos/reactos.git
synced 2024-07-09 06:05:11 +00:00
280 lines
6.5 KiB
PHP
280 lines
6.5 KiB
PHP
/*
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* PROJECT: ReactOS SDK
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* LICENSE: MIT (https://spdx.org/licenses/MIT)
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* PURPOSE: ASM macros for x64 trap handling
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* COPYRIGHT: Copyright 2011-2024 Timo Kreuzer (timo.kreuzer@reactos.org)
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*/
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MACRO(ASSERT_TRAP_FRAME_INTS_ENABLED, Register)
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#if DBG
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LOCAL IntsAreEnabled
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test dword ptr [Register + KTRAP_FRAME_EFlags], HEX(200)
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jnz IntsAreEnabled
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int HEX(2C)
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IntsAreEnabled:
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#endif
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ENDM
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MACRO(ASSERT_TRAP_FRAME_IRQL_VALID, Register)
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#if DBG
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LOCAL IrqlIsValid
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mov rax, cr8
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cmp byte ptr [Register + KTRAP_FRAME_PreviousIrql], al
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je IrqlIsValid
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int HEX(2C)
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IrqlIsValid:
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#endif
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ENDM
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MACRO(ASSERT_IRQL_PASSIVE)
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#if DBG
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LOCAL IrqlIsPassive
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mov rax, cr8
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test rax, rax
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jz IrqlIsPassive
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int HEX(2C)
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IrqlIsPassive:
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#endif
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ENDM
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// Checks for user APCs and delivers them if necessary.
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// Clobbers all volatile registers except rax.
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MACRO(HANDLE_USER_APCS, ThreadReg, TrapFrame)
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LOCAL NoUserApcPending
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/* Check for pending user APC */
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cmp byte ptr [ThreadReg + ThApcState + AsUserApcPending], 0
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jz NoUserApcPending
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lea rcx, [TrapFrame]
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call KiInitiateUserApc
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NoUserApcPending:
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ENDM
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APIC_EOI = HEX(0FFFFFFFFFFFE00B0)
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TF_SEGMENTS = HEX(08)
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TF_DEBUG = HEX(10)
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TF_IRQL = HEX(20)
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TF_SAVE_ALL = (TF_SEGMENTS)
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TF_HAS_ERROR_CODE = HEX(40)
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TF_SEND_EOI = HEX(80)
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//TF_SYSTEMSERVICE = (TRAPFLAG_VOLATILES or TRAPFLAG_DEBUG)
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TF_CHECKUSERAPC = HEX(100)
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/*
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* Stack Layout:
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* |-------------------|
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* | KTRAP_FRAME |
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* |-------------------| <- rbp
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* | EXCEPTION_RECORD |
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* |-------------------|
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* | KEXCEPTION_FRAME |
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* |-------------------| <- rsp
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*
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*/
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/*
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* EnterTrap - Allocate KTRAP_FRAME_LENGTH and save registers to it
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*/
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MACRO(EnterTrap, Flags)
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LOCAL kernel_mode_entry
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/* Save the trap flags for this trap */
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CurrentTrapFlags = VAL(Flags)
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/* Size of hardware trap frame */
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if (Flags AND TF_HAS_ERROR_CODE)
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.pushframe code
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SIZE_INITIAL_FRAME = 6 * 8
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else
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.pushframe
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SIZE_INITIAL_FRAME = 5 * 8
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endif
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/* Make room for a KTRAP_FRAME */
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sub rsp, (KTRAP_FRAME_LENGTH - SIZE_INITIAL_FRAME)
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.allocstack (KTRAP_FRAME_LENGTH - SIZE_INITIAL_FRAME)
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/* Save rbp */
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mov [rsp + KTRAP_FRAME_Rbp], rbp
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.savereg rbp, KTRAP_FRAME_Rbp
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/* Point rbp to the KTRAP_FRAME */
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lea rbp, [rsp]
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.setframe rbp, 0
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.endprolog
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/* Save volatile registers */
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mov [rbp + KTRAP_FRAME_Rax], rax
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mov [rbp + KTRAP_FRAME_Rcx], rcx
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mov [rbp + KTRAP_FRAME_Rdx], rdx
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mov [rbp + KTRAP_FRAME_R8], r8
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mov [rbp + KTRAP_FRAME_R9], r9
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mov [rbp + KTRAP_FRAME_R10], r10
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mov [rbp + KTRAP_FRAME_R11], r11
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/* Save volatile xmm registers */
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movaps [rbp + KTRAP_FRAME_Xmm0], xmm0
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movaps [rbp + KTRAP_FRAME_Xmm1], xmm1
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movaps [rbp + KTRAP_FRAME_Xmm2], xmm2
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movaps [rbp + KTRAP_FRAME_Xmm3], xmm3
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movaps [rbp + KTRAP_FRAME_Xmm4], xmm4
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movaps [rbp + KTRAP_FRAME_Xmm5], xmm5
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if (Flags AND TF_SEGMENTS)
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/* Save segment selectors */
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mov [rbp + KTRAP_FRAME_SegDs], ds
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mov [rbp + KTRAP_FRAME_SegEs], es
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mov [rbp + KTRAP_FRAME_SegFs], fs
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mov [rbp + KTRAP_FRAME_SegGs], gs
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endif
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/* Save MCXSR */
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stmxcsr [rbp + KTRAP_FRAME_MxCsr]
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#if DBG
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mov ecx, MSR_GS_BASE
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rdmsr
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mov [rbp + KTRAP_FRAME_GsBase], eax
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mov [rbp + KTRAP_FRAME_GsBase + 4], edx
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#endif
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/* Save previous mode and check if it was user mode */
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mov ax, [rbp + KTRAP_FRAME_SegCs]
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and al, 1
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mov [rbp + KTRAP_FRAME_PreviousMode], al
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jz kernel_mode_entry
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/* Set sane segments */
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mov ax, (KGDT64_R3_DATA or RPL_MASK)
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mov ds, ax
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mov es, ax
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swapgs
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/* Load kernel MXCSR */
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ldmxcsr gs:[PcMxCsr]
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ASSERT_IRQL_PASSIVE
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kernel_mode_entry:
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// if (Flags AND TF_IRQL)
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/* Save previous irql */
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mov rax, cr8
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mov [rbp + KTRAP_FRAME_PreviousIrql], al
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// endif
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if (Flags AND TF_DEBUG)
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/* Save debug registers */
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mov rax, dr0
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mov [rbp + KTRAP_FRAME_Dr0], rax
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mov rax, dr1
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mov [rbp + KTRAP_FRAME_Dr1], rax
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mov rax, dr2
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mov [rbp + KTRAP_FRAME_Dr2], rax
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mov rax, dr3
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mov [rbp + KTRAP_FRAME_Dr3], rax
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mov rax, dr6
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mov [rbp + KTRAP_FRAME_Dr6], rax
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mov rax, dr7
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mov [rbp + KTRAP_FRAME_Dr7], rax
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endif
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/* Make sure the direction flag is cleared */
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cld
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ENDM
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/*
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* ExitTrap - Restore registers and free stack space
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*/
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MACRO(ExitTrap, Flags)
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LOCAL kernel_mode_return
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ASSERT_TRAP_FRAME_IRQL_VALID rbp
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if (Flags AND TF_SEGMENTS)
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/* Restore segment selectors */
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mov ds, [rbp + KTRAP_FRAME_SegDs]
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mov es, [rbp + KTRAP_FRAME_SegEs]
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mov fs, [rbp + KTRAP_FRAME_SegFs]
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endif
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if (Flags AND TF_IRQL)
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/* Restore previous irql */
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movzx rax, byte ptr [rbp + KTRAP_FRAME_PreviousIrql]
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mov cr8, rax
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endif
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/* Check if we came from user mode */
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test byte ptr [rbp + KTRAP_FRAME_SegCs], 1
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jz kernel_mode_return
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if (Flags AND TF_CHECKUSERAPC)
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mov r10, gs:[PcCurrentThread]
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HANDLE_USER_APCS r10, rbp
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endif
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ASSERT_TRAP_FRAME_INTS_ENABLED rbp
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ASSERT_IRQL_PASSIVE
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cli
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/* Swap gs to user mode */
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swapgs
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kernel_mode_return:
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/* Restore volatile registers */
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mov rax, [rbp + KTRAP_FRAME_Rax]
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mov rcx, [rbp + KTRAP_FRAME_Rcx]
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mov rdx, [rbp + KTRAP_FRAME_Rdx]
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mov r8, [rbp + KTRAP_FRAME_R8]
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mov r9, [rbp + KTRAP_FRAME_R9]
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mov r10, [rbp + KTRAP_FRAME_R10]
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mov r11, [rbp + KTRAP_FRAME_R11]
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/* Restore xmm registers */
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movaps xmm0, [rbp + KTRAP_FRAME_Xmm0]
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movaps xmm1, [rbp + KTRAP_FRAME_Xmm1]
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movaps xmm2, [rbp + KTRAP_FRAME_Xmm2]
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movaps xmm3, [rbp + KTRAP_FRAME_Xmm3]
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movaps xmm4, [rbp + KTRAP_FRAME_Xmm4]
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movaps xmm5, [rbp + KTRAP_FRAME_Xmm5]
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/* Restore MCXSR */
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ldmxcsr [rbp + KTRAP_FRAME_MxCsr]
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/* Restore rbp */
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mov rbp, [rbp + KTRAP_FRAME_Rbp]
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/* Adjust stack pointer */
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add rsp, KTRAP_FRAME_Rip
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if (Flags AND TF_SEND_EOI)
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/* Write 0 to the local APIC EOI register */
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mov dword ptr [APIC_EOI], 0
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endif
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/* Return from the trap */
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iretq
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ENDM
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MACRO(TRAP_ENTRY, Trap, Flags)
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EXTERN Trap&Handler :PROC
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PUBLIC &Trap
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FUNC &Trap
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/* Common code to create the trap frame */
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EnterTrap Flags
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/* Call the C handler */
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mov rcx, rbp
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call Trap&Handler
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/* Leave */
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ExitTrap Flags
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ENDFUNC
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ENDM
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