/
trapamd64.inc
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/
trapamd64.inc
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/*
* PROJECT: ReactOS SDK
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: ASM macros for x64 trap handling
* COPYRIGHT: Copyright 2011-2024 Timo Kreuzer (timo.kreuzer@reactos.org)
*/
MACRO(ASSERT_TRAP_FRAME_INTS_ENABLED, Register)
#if DBG
LOCAL IntsAreEnabled
test dword ptr [Register + KTRAP_FRAME_EFlags], HEX(200)
jnz IntsAreEnabled
int HEX(2C)
IntsAreEnabled:
#endif
ENDM
MACRO(ASSERT_TRAP_FRAME_IRQL_VALID, Register)
#if DBG
LOCAL IrqlIsValid
mov rax, cr8
cmp byte ptr [Register + KTRAP_FRAME_PreviousIrql], al
je IrqlIsValid
int HEX(2C)
IrqlIsValid:
#endif
ENDM
MACRO(ASSERT_IRQL_PASSIVE)
#if DBG
LOCAL IrqlIsPassive
mov rax, cr8
test rax, rax
jz IrqlIsPassive
int HEX(2C)
IrqlIsPassive:
#endif
ENDM
// Checks for user APCs and delivers them if necessary.
// Clobbers all volatile registers except rax.
MACRO(HANDLE_USER_APCS, ThreadReg, TrapFrame)
LOCAL NoUserApcPending
/* Check for pending user APC */
cmp byte ptr [ThreadReg + ThApcState + AsUserApcPending], 0
jz NoUserApcPending
lea rcx, [TrapFrame]
call KiInitiateUserApc
NoUserApcPending:
ENDM
APIC_EOI = HEX(0FFFFFFFFFFFE00B0)
TF_VOLATILES = HEX(01)
TF_NONVOLATILES = HEX(02)
TF_XMM = HEX(04)
TF_SEGMENTS = HEX(08)
TF_DEBUG = HEX(10)
TF_IRQL = HEX(20)
TF_SAVE_ALL = (TF_VOLATILES OR TF_NONVOLATILES OR TF_XMM OR TF_SEGMENTS)
TF_HAS_ERROR_CODE = HEX(40)
TF_SEND_EOI = HEX(80)
//TF_SYSTEMSERVICE = (TRAPFLAG_VOLATILES or TRAPFLAG_DEBUG)
TF_CHECKUSERAPC = HEX(100)
/*
* Stack Layout:
* |-------------------|
* | KTRAP_FRAME |
* |-------------------| <- rbp
* | EXCEPTION_RECORD |
* |-------------------|
* | KEXCEPTION_FRAME |
* |-------------------| <- rsp
*
*/
/*
* EnterTrap - Allocate KTRAP_FRAME_LENGTH and save registers to it
*/
MACRO(EnterTrap, Flags)
LOCAL kernel_mode_entry
/* Save the trap flags for this trap */
CurrentTrapFlags = VAL(Flags)
/* Size of hardware trap frame */
if (Flags AND TF_HAS_ERROR_CODE)
.pushframe code
SIZE_INITIAL_FRAME = 6 * 8
else
.pushframe
SIZE_INITIAL_FRAME = 5 * 8
endif
/* Make room for a KTRAP_FRAME */
sub rsp, (KTRAP_FRAME_LENGTH - SIZE_INITIAL_FRAME)
.allocstack (KTRAP_FRAME_LENGTH - SIZE_INITIAL_FRAME)
/* Save rbp and rax */
mov [rsp + KTRAP_FRAME_Rbp], rbp
.savereg rbp, KTRAP_FRAME_Rbp
mov [rsp + KTRAP_FRAME_Rax], rax
.savereg rax, KTRAP_FRAME_Rax
/* Point rbp to the KTRAP_FRAME */
lea rbp, [rsp]
.setframe rbp, 0
if (Flags AND TF_NONVOLATILES)
/* Save non-volatile registers */
mov [rbp + KTRAP_FRAME_Rbx], rbx
.savereg rbx, KTRAP_FRAME_Rbx
mov [rbp + KTRAP_FRAME_Rdi], rdi
.savereg rdi, KTRAP_FRAME_Rdi
mov [rbp + KTRAP_FRAME_Rsi], rsi
.savereg rsi, KTRAP_FRAME_Rsi
endif
.endprolog
if (Flags AND TF_VOLATILES)
/* Save volatile registers */
mov [rbp + KTRAP_FRAME_Rcx], rcx
mov [rbp + KTRAP_FRAME_Rdx], rdx
mov [rbp + KTRAP_FRAME_R8], r8
mov [rbp + KTRAP_FRAME_R9], r9
mov [rbp + KTRAP_FRAME_R10], r10
mov [rbp + KTRAP_FRAME_R11], r11
endif
if (Flags AND TF_XMM)
/* Save xmm registers */
movdqa [rbp + KTRAP_FRAME_Xmm0], xmm0
movdqa [rbp + KTRAP_FRAME_Xmm1], xmm1
movdqa [rbp + KTRAP_FRAME_Xmm2], xmm2
movdqa [rbp + KTRAP_FRAME_Xmm3], xmm3
movdqa [rbp + KTRAP_FRAME_Xmm4], xmm4
movdqa [rbp + KTRAP_FRAME_Xmm5], xmm5
endif
if (Flags AND TF_SEGMENTS)
/* Save segment selectors */
mov [rbp + KTRAP_FRAME_SegDs], ds
mov [rbp + KTRAP_FRAME_SegEs], es
mov [rbp + KTRAP_FRAME_SegFs], fs
mov [rbp + KTRAP_FRAME_SegGs], gs
endif
/* Save MCXSR */
stmxcsr [rbp + KTRAP_FRAME_MxCsr]
#if DBG
mov ecx, MSR_GS_BASE
rdmsr
mov [rbp + KTRAP_FRAME_GsBase], eax
mov [rbp + KTRAP_FRAME_GsBase + 4], edx
#endif
/* Save previous mode and check if it was user mode */
mov ax, [rbp + KTRAP_FRAME_SegCs]
and al, 1
mov [rbp + KTRAP_FRAME_PreviousMode], al
jz kernel_mode_entry
/* Set sane segments */
mov ax, (KGDT64_R3_DATA or RPL_MASK)
mov ds, ax
mov es, ax
swapgs
/* Load kernel MXCSR */
ldmxcsr gs:[PcMxCsr]
ASSERT_IRQL_PASSIVE
kernel_mode_entry:
// if (Flags AND TF_IRQL)
/* Save previous irql */
mov rax, cr8
mov [rbp + KTRAP_FRAME_PreviousIrql], al
// endif
if (Flags AND TF_DEBUG)
/* Save debug registers */
mov rax, dr0
mov [rbp + KTRAP_FRAME_Dr0], rax
mov rax, dr1
mov [rbp + KTRAP_FRAME_Dr1], rax
mov rax, dr2
mov [rbp + KTRAP_FRAME_Dr2], rax
mov rax, dr3
mov [rbp + KTRAP_FRAME_Dr3], rax
mov rax, dr6
mov [rbp + KTRAP_FRAME_Dr6], rax
mov rax, dr7
mov [rbp + KTRAP_FRAME_Dr7], rax
endif
/* Make sure the direction flag is cleared */
cld
ENDM
/*
* ExitTrap - Restore registers and free stack space
*/
MACRO(ExitTrap, Flags)
LOCAL kernel_mode_return
ASSERT_TRAP_FRAME_IRQL_VALID rbp
if (Flags AND TF_SEGMENTS)
/* Restore segment selectors */
mov ds, [rbp + KTRAP_FRAME_SegDs]
mov es, [rbp + KTRAP_FRAME_SegEs]
mov fs, [rbp + KTRAP_FRAME_SegFs]
endif
if (Flags AND TF_IRQL)
/* Restore previous irql */
movzx rax, byte ptr [rbp + KTRAP_FRAME_PreviousIrql]
mov cr8, rax
endif
/* Check if we came from user mode */
test byte ptr [rbp + KTRAP_FRAME_SegCs], 1
jz kernel_mode_return
if (Flags AND TF_CHECKUSERAPC)
mov r10, gs:[PcCurrentThread]
HANDLE_USER_APCS r10, rbp
endif
ASSERT_TRAP_FRAME_INTS_ENABLED rbp
ASSERT_IRQL_PASSIVE
cli
/* Swap gs to user mode */
swapgs
kernel_mode_return:
if (Flags AND TF_NONVOLATILES)
/* Restore non-volatile registers */
mov rbx, [rbp + KTRAP_FRAME_Rbx]
mov rdi, [rbp + KTRAP_FRAME_Rdi]
mov rsi, [rbp + KTRAP_FRAME_Rsi]
endif
if (Flags AND TF_VOLATILES)
/* Restore volatile registers */
mov rax, [rbp + KTRAP_FRAME_Rax]
mov rcx, [rbp + KTRAP_FRAME_Rcx]
mov rdx, [rbp + KTRAP_FRAME_Rdx]
mov r8, [rbp + KTRAP_FRAME_R8]
mov r9, [rbp + KTRAP_FRAME_R9]
mov r10, [rbp + KTRAP_FRAME_R10]
mov r11, [rbp + KTRAP_FRAME_R11]
endif
if (Flags AND TF_XMM)
/* Restore xmm registers */
movdqa xmm0, [rbp + KTRAP_FRAME_Xmm0]
movdqa xmm1, [rbp + KTRAP_FRAME_Xmm1]
movdqa xmm2, [rbp + KTRAP_FRAME_Xmm2]
movdqa xmm3, [rbp + KTRAP_FRAME_Xmm3]
movdqa xmm4, [rbp + KTRAP_FRAME_Xmm4]
movdqa xmm5, [rbp + KTRAP_FRAME_Xmm5]
endif
/* Restore MCXSR */
ldmxcsr [rbp + KTRAP_FRAME_MxCsr]
/* Restore rbp */
mov rbp, [rbp + KTRAP_FRAME_Rbp]
/* Adjust stack pointer */
add rsp, KTRAP_FRAME_Rip
if (Flags AND TF_SEND_EOI)
/* Write 0 to the local APIC EOI register */
mov dword ptr [APIC_EOI], 0
endif
/* Return from the trap */
iretq
ENDM
MACRO(TRAP_ENTRY, Trap, Flags)
EXTERN Trap&Handler :PROC
PUBLIC &Trap
FUNC &Trap
/* Common code to create the trap frame */
EnterTrap Flags
/* Call the C handler */
mov rcx, rbp
call Trap&Handler
/* Leave */
ExitTrap Flags
ENDFUNC
ENDM