184 lines
4.3 KiB
NASM
184 lines
4.3 KiB
NASM
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; Copyright (c) Microsoft Corporation
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;
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; Module Name:
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;
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; bllegacy.asm
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;
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; Abstract:
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;
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; This module implements legacy call support.
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;
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; Environment:
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;
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; Boot loader.
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;
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;--
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include bl.inc
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.code
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;
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; Interrupt return frame.
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;
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InterruptReturnFrame struct
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_rip dq ?
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_cs dq ?
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_rflags dq ?
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_rsp dq ?
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_ss dq ?
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InterruptReturnFrame ends
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;
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; Legacy call frame.
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;
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LegacyCallFrame struct
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_rax dq ?
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_rbx dq ?
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_rcx dq ?
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_rdx dq ?
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_rbp dq ?
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_rsi dq ?
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_rdi dq ?
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_r8 dq ?
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_r9 dq ?
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_r10 dq ?
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_r11 dq ?
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_r12 dq ?
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_r13 dq ?
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_r14 dq ?
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_r15 dq ?
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LegacyCallFrame ends
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BlLegacyReturn_RSP dq 0
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;++
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;
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; VOID
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; BlReturnToLegacyMode(
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; VOID
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; )
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;
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; Routine Description:
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;
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; This function returns to legacy mode to process a legacy request.
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;
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;--
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?BlReturnToLegacyMode@@YAXXZ proc
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;
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; Save all registers.
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;
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sub rsp, (sizeof LegacyCallFrame)
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mov qword ptr [rsp].LegacyCallFrame._rax, rax
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mov qword ptr [rsp].LegacyCallFrame._rbx, rbx
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mov qword ptr [rsp].LegacyCallFrame._rcx, rcx
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mov qword ptr [rsp].LegacyCallFrame._rdx, rdx
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mov qword ptr [rsp].LegacyCallFrame._rbp, rbp
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mov qword ptr [rsp].LegacyCallFrame._rsi, rsi
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mov qword ptr [rsp].LegacyCallFrame._rdi, rdi
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mov qword ptr [rsp].LegacyCallFrame._r8, r8
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mov qword ptr [rsp].LegacyCallFrame._r9, r9
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mov qword ptr [rsp].LegacyCallFrame._r10, r10
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mov qword ptr [rsp].LegacyCallFrame._r11, r11
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mov qword ptr [rsp].LegacyCallFrame._r12, r12
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mov qword ptr [rsp].LegacyCallFrame._r13, r13
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mov qword ptr [rsp].LegacyCallFrame._r14, r14
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mov qword ptr [rsp].LegacyCallFrame._r15, r15
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;
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; Save stack pointer.
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;
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mov BlLegacyReturn_RSP, rsp
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;
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; Set return address in BEB.
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;
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mov rax, BEB_BASE
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lea rcx, @f
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mov dword ptr [rax].BEB.LegacyReturnAddress, ecx
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;
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; Get legacy call stub address from BEB.
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;
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xor rcx, rcx
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mov ecx, dword ptr [rax].BEB.LegacyCallAddress
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;
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; Construct interrupt return frame.
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;
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sub rsp, (sizeof InterruptReturnFrame)
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mov qword ptr [rsp].InterruptReturnFrame._rip, rcx
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mov qword ptr [rsp].InterruptReturnFrame._cs, PM_CODE_SELECTOR
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pushfq
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pop rax
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mov qword ptr [rsp].InterruptReturnFrame._rflags, rax
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mov qword ptr [rsp].InterruptReturnFrame._rsp, rsp
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mov rax, PM_DATA_SELECTOR
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mov qword ptr [rsp].InterruptReturnFrame._ss, rax
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mov ds, rax
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mov es, rax
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mov fs, rax
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mov gs, rax
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iretq
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@@:
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;
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; Restore stack pointer.
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;
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mov rsp, BlLegacyReturn_RSP
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;
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; Restore all registers.
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;
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mov rax, qword ptr [rsp].LegacyCallFrame._rax
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mov rbx, qword ptr [rsp].LegacyCallFrame._rbx
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mov rcx, qword ptr [rsp].LegacyCallFrame._rcx
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mov rdx, qword ptr [rsp].LegacyCallFrame._rdx
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mov rbp, qword ptr [rsp].LegacyCallFrame._rbp
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mov rsi, qword ptr [rsp].LegacyCallFrame._rsi
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mov rdi, qword ptr [rsp].LegacyCallFrame._rdi
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mov r8, qword ptr [rsp].LegacyCallFrame._r8
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mov r9, qword ptr [rsp].LegacyCallFrame._r9
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mov r10, qword ptr [rsp].LegacyCallFrame._r10
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mov r11, qword ptr [rsp].LegacyCallFrame._r11
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mov r12, qword ptr [rsp].LegacyCallFrame._r12
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mov r13, qword ptr [rsp].LegacyCallFrame._r13
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mov r14, qword ptr [rsp].LegacyCallFrame._r14
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mov r15, qword ptr [rsp].LegacyCallFrame._r15
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add rsp, (sizeof LegacyCallFrame)
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ret
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?BlReturnToLegacyMode@@YAXXZ endp
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public ?BlReturnToLegacyMode@@YAXXZ
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end
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