| 1 | ; $Id: VMMR0JmpA-amd64.asm 98103 2023-01-17 14:15:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; VMM - R0 SetJmp / LongJmp routines for AMD64.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; SPDX-License-Identifier: GPL-3.0-only
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| 26 | ;
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| 27 |
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| 28 | ;*********************************************************************************************************************************
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| 29 | ;* Header Files *
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| 30 | ;*********************************************************************************************************************************
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| 31 | %define RT_ASM_WITH_SEH64_ALT
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| 32 | %include "VBox/asmdefs.mac"
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| 33 | %include "VMMInternal.mac"
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| 34 | %include "VBox/err.mac"
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| 35 | %include "VBox/param.mac"
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| 36 |
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| 37 |
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| 38 | BEGINCODE
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| 39 |
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| 40 | ;;
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| 41 | ; The setjmp variant used for calling Ring-3.
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| 42 | ;
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| 43 | ; This differs from the normal setjmp in that it will resume VMMRZCallRing3 if we're
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| 44 | ; in the middle of a ring-3 call. Another differences is the function pointer and
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| 45 | ; argument. This has to do with resuming code and the stack frame of the caller.
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| 46 | ;
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| 47 | ; @returns VINF_SUCCESS on success or whatever is passed to vmmR0CallRing3LongJmp.
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| 48 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[esp+0x04] Our jmp_buf.
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| 49 | ; @param pfn msc:rdx gcc:rsi x86:[esp+0x08] The function to be called when not resuming.
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| 50 | ; @param pvUser1 msc:r8 gcc:rdx x86:[esp+0x0c] The argument of that function.
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| 51 | ; @param pvUser2 msc:r9 gcc:rcx x86:[esp+0x10] The argument of that function.
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| 52 | ;
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| 53 | GLOBALNAME vmmR0CallRing3SetJmp2
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| 54 | GLOBALNAME vmmR0CallRing3SetJmpEx
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| 55 | BEGINPROC vmmR0CallRing3SetJmp
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| 56 | ;
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| 57 | ; Save the registers.
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| 58 | ;
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| 59 | push rbp
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| 60 | SEH64_PUSH_xBP
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| 61 | mov rbp, rsp
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| 62 | SEH64_SET_FRAME_xBP 0
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| 63 | %ifdef ASM_CALL64_MSC
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| 64 | sub rsp, 30h ; (10h is used by resume (??), 20h for callee spill area)
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| 65 | SEH64_ALLOCATE_STACK 30h
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| 66 | SEH64_END_PROLOGUE
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| 67 | mov r11, rdx ; pfn
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| 68 | mov rdx, rcx ; pJmpBuf;
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| 69 | %else
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| 70 | sub rsp, 10h ; (10h is used by resume (??))
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| 71 | SEH64_ALLOCATE_STACK 10h
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| 72 | SEH64_END_PROLOGUE
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| 73 | mov r8, rdx ; pvUser1 (save it like MSC)
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| 74 | mov r9, rcx ; pvUser2 (save it like MSC)
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| 75 | mov r11, rsi ; pfn
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| 76 | mov rdx, rdi ; pJmpBuf
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| 77 | %endif
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| 78 | mov [xDX + VMMR0JMPBUF.rbx], rbx
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| 79 | %ifdef ASM_CALL64_MSC
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| 80 | mov [xDX + VMMR0JMPBUF.rsi], rsi
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| 81 | mov [xDX + VMMR0JMPBUF.rdi], rdi
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| 82 | %endif
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| 83 | mov [xDX + VMMR0JMPBUF.rbp], rbp
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| 84 | mov [xDX + VMMR0JMPBUF.r12], r12
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| 85 | mov [xDX + VMMR0JMPBUF.r13], r13
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| 86 | mov [xDX + VMMR0JMPBUF.r14], r14
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| 87 | mov [xDX + VMMR0JMPBUF.r15], r15
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| 88 | mov xAX, [rbp + 8] ; (not really necessary, except for validity check)
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| 89 | mov [xDX + VMMR0JMPBUF.rip], xAX
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| 90 | %ifdef ASM_CALL64_MSC
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| 91 | lea r10, [rsp + 20h] ; must save the spill area
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| 92 | %else
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| 93 | lea r10, [rsp]
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| 94 | %endif
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| 95 | mov [xDX + VMMR0JMPBUF.rsp], r10
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| 96 | %ifdef RT_OS_WINDOWS
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| 97 | movdqa [xDX + VMMR0JMPBUF.xmm6], xmm6
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| 98 | movdqa [xDX + VMMR0JMPBUF.xmm7], xmm7
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| 99 | movdqa [xDX + VMMR0JMPBUF.xmm8], xmm8
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| 100 | movdqa [xDX + VMMR0JMPBUF.xmm9], xmm9
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| 101 | movdqa [xDX + VMMR0JMPBUF.xmm10], xmm10
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| 102 | movdqa [xDX + VMMR0JMPBUF.xmm11], xmm11
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| 103 | movdqa [xDX + VMMR0JMPBUF.xmm12], xmm12
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| 104 | movdqa [xDX + VMMR0JMPBUF.xmm13], xmm13
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| 105 | movdqa [xDX + VMMR0JMPBUF.xmm14], xmm14
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| 106 | movdqa [xDX + VMMR0JMPBUF.xmm15], xmm15
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| 107 | %endif
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| 108 | pushf
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| 109 | pop xAX
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| 110 | mov [xDX + VMMR0JMPBUF.rflags], xAX
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| 111 |
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| 112 | ;
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| 113 | ; Save the call then make it.
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| 114 | ;
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| 115 | mov [xDX + VMMR0JMPBUF.pfn], r11
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| 116 | mov [xDX + VMMR0JMPBUF.pvUser1], r8
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| 117 | mov [xDX + VMMR0JMPBUF.pvUser2], r9
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| 118 |
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| 119 | mov r12, rdx ; Save pJmpBuf.
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| 120 | %ifdef ASM_CALL64_MSC
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| 121 | mov rcx, r8 ; pvUser -> arg0
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| 122 | mov rdx, r9
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| 123 | %else
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| 124 | mov rdi, r8 ; pvUser -> arg0
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| 125 | mov rsi, r9
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| 126 | %endif
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| 127 | call r11
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| 128 | mov rdx, r12 ; Restore pJmpBuf
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| 129 |
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| 130 | ;
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| 131 | ; Return like in the long jump but clear eip, no shortcuts here.
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| 132 | ;
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| 133 | .proper_return:
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| 134 | %ifdef RT_OS_WINDOWS
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| 135 | movdqa xmm6, [xDX + VMMR0JMPBUF.xmm6 ]
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| 136 | movdqa xmm7, [xDX + VMMR0JMPBUF.xmm7 ]
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| 137 | movdqa xmm8, [xDX + VMMR0JMPBUF.xmm8 ]
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| 138 | movdqa xmm9, [xDX + VMMR0JMPBUF.xmm9 ]
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| 139 | movdqa xmm10, [xDX + VMMR0JMPBUF.xmm10]
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| 140 | movdqa xmm11, [xDX + VMMR0JMPBUF.xmm11]
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| 141 | movdqa xmm12, [xDX + VMMR0JMPBUF.xmm12]
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| 142 | movdqa xmm13, [xDX + VMMR0JMPBUF.xmm13]
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| 143 | movdqa xmm14, [xDX + VMMR0JMPBUF.xmm14]
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| 144 | movdqa xmm15, [xDX + VMMR0JMPBUF.xmm15]
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| 145 | %endif
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| 146 | mov rbx, [xDX + VMMR0JMPBUF.rbx]
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| 147 | %ifdef ASM_CALL64_MSC
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| 148 | mov rsi, [xDX + VMMR0JMPBUF.rsi]
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| 149 | mov rdi, [xDX + VMMR0JMPBUF.rdi]
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| 150 | %endif
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| 151 | mov r12, [xDX + VMMR0JMPBUF.r12]
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| 152 | mov r13, [xDX + VMMR0JMPBUF.r13]
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| 153 | mov r14, [xDX + VMMR0JMPBUF.r14]
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| 154 | mov r15, [xDX + VMMR0JMPBUF.r15]
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| 155 | mov rbp, [xDX + VMMR0JMPBUF.rbp]
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| 156 | and qword [xDX + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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| 157 | mov rsp, [xDX + VMMR0JMPBUF.rsp]
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| 158 | push qword [xDX + VMMR0JMPBUF.rflags]
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| 159 | popf
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| 160 | leave
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| 161 | ret
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| 162 | ENDPROC vmmR0CallRing3SetJmp
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| 163 |
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| 164 |
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| 165 | ;;
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| 166 | ; Worker for VMMRZCallRing3.
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| 167 | ; This will save the stack and registers.
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| 168 | ;
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| 169 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[ebp+8] Pointer to the jump buffer.
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| 170 | ; @param rc msc:rdx gcc:rsi x86:[ebp+c] The return code.
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| 171 | ;
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| 172 | BEGINPROC vmmR0CallRing3LongJmp
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| 173 | ;
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| 174 | ; Save the registers on the stack.
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| 175 | ;
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| 176 | push rbp
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| 177 | SEH64_PUSH_xBP
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| 178 | mov rbp, rsp
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| 179 | SEH64_SET_FRAME_xBP 0
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| 180 | push r15
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| 181 | SEH64_PUSH_GREG r15
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| 182 | push r14
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| 183 | SEH64_PUSH_GREG r14
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| 184 | push r13
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| 185 | SEH64_PUSH_GREG r13
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| 186 | push r12
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| 187 | SEH64_PUSH_GREG r12
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| 188 | %ifdef ASM_CALL64_MSC
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| 189 | push rdi
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| 190 | SEH64_PUSH_GREG rdi
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| 191 | push rsi
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| 192 | SEH64_PUSH_GREG rsi
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| 193 | %endif
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| 194 | push rbx
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| 195 | SEH64_PUSH_GREG rbx
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| 196 | pushf
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| 197 | SEH64_ALLOCATE_STACK 8
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| 198 | %ifdef RT_OS_WINDOWS
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| 199 | sub rsp, 0a0h
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| 200 | SEH64_ALLOCATE_STACK 0a0h
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| 201 | movdqa [rsp + 000h], xmm6
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| 202 | movdqa [rsp + 010h], xmm7
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| 203 | movdqa [rsp + 020h], xmm8
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| 204 | movdqa [rsp + 030h], xmm9
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| 205 | movdqa [rsp + 040h], xmm10
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| 206 | movdqa [rsp + 050h], xmm11
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| 207 | movdqa [rsp + 060h], xmm12
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| 208 | movdqa [rsp + 070h], xmm13
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| 209 | movdqa [rsp + 080h], xmm14
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| 210 | movdqa [rsp + 090h], xmm15
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| 211 | %endif
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| 212 | SEH64_END_PROLOGUE
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| 213 |
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| 214 | ;
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| 215 | ; Normalize the parameters.
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| 216 | ;
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| 217 | %ifdef ASM_CALL64_MSC
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| 218 | mov eax, edx ; rc
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| 219 | mov rdx, rcx ; pJmpBuf
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| 220 | %else
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| 221 | mov rdx, rdi ; pJmpBuf
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| 222 | mov eax, esi ; rc
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| 223 | %endif
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| 224 |
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| 225 | ;
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| 226 | ; Is the jump buffer armed?
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| 227 | ;
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| 228 | cmp qword [xDX + VMMR0JMPBUF.rip], byte 0
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| 229 | je .nok
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| 230 |
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| 231 | ;
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| 232 | ; Also check that the stack is in the vicinity of the RSP we entered
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| 233 | ; on so the stack mirroring below doesn't go wild.
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| 234 | ;
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| 235 | mov rsi, rsp
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| 236 | mov rcx, [xDX + VMMR0JMPBUF.rsp]
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| 237 | sub rcx, rsi
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| 238 | cmp rcx, _64K
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| 239 | jnbe .nok
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| 240 |
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| 241 | ;
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| 242 | ; Save a PC and return PC here to assist unwinding.
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| 243 | ;
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| 244 | .unwind_point:
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| 245 | lea rcx, [.unwind_point wrt RIP]
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| 246 | mov [xDX + VMMR0JMPBUF.UnwindPc], rcx
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| 247 | mov rcx, [xDX + VMMR0JMPBUF.rbp]
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| 248 | lea rcx, [rcx + 8]
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| 249 | mov [xDX + VMMR0JMPBUF.UnwindRetPcLocation], rcx
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| 250 | mov rcx, [rcx]
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| 251 | mov [xDX + VMMR0JMPBUF.UnwindRetPcValue], rcx
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| 252 |
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| 253 | ; Save RSP & RBP to enable stack dumps
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| 254 | mov [xDX + VMMR0JMPBUF.UnwindSp], rsp
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| 255 | mov rcx, rbp
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| 256 | mov [xDX + VMMR0JMPBUF.UnwindBp], rcx
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| 257 | sub rcx, 8
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| 258 | mov [xDX + VMMR0JMPBUF.UnwindRetSp], rcx
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| 259 |
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| 260 | ;
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| 261 | ; Make sure the direction flag is clear before we do any rep movsb below.
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| 262 | ;
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| 263 | cld
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| 264 |
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| 265 | ;
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| 266 | ; Mirror the stack.
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| 267 | ;
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| 268 | xor ebx, ebx
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| 269 |
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| 270 | mov rdi, [xDX + VMMR0JMPBUF.pvStackBuf]
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| 271 | or rdi, rdi
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| 272 | jz .skip_stack_mirroring
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| 273 |
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| 274 | mov ebx, [xDX + VMMR0JMPBUF.cbStackBuf]
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| 275 | or ebx, ebx
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| 276 | jz .skip_stack_mirroring
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| 277 |
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| 278 | mov rcx, [xDX + VMMR0JMPBUF.rsp]
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| 279 | sub rcx, rsp
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| 280 | and rcx, ~0fffh ; copy up to the page boundrary
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| 281 |
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| 282 | cmp rcx, rbx ; rbx = rcx = RT_MIN(rbx, rcx);
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| 283 | jbe .do_stack_buffer_big_enough
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| 284 | mov ecx, ebx ; too much to copy, limit to ebx
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| 285 | jmp .do_stack_copying
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| 286 | .do_stack_buffer_big_enough:
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| 287 | mov ebx, ecx ; ecx is smaller, update ebx for cbStackValid
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| 288 |
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| 289 | .do_stack_copying:
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| 290 | mov rsi, rsp
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| 291 | rep movsb
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| 292 |
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| 293 | .skip_stack_mirroring:
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| 294 | mov [xDX + VMMR0JMPBUF.cbStackValid], ebx
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| 295 |
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| 296 | ;
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| 297 | ; Do buffer mirroring.
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| 298 | ;
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| 299 | mov rdi, [xDX + VMMR0JMPBUF.pMirrorBuf]
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| 300 | or rdi, rdi
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| 301 | jz .skip_buffer_mirroring
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| 302 | mov rsi, rdx
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| 303 | mov ecx, VMMR0JMPBUF_size
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| 304 | rep movsb
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| 305 | .skip_buffer_mirroring:
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| 306 |
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| 307 | ;
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| 308 | ; Do the long jump.
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| 309 | ;
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| 310 | %ifdef RT_OS_WINDOWS
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| 311 | movdqa xmm6, [xDX + VMMR0JMPBUF.xmm6 ]
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| 312 | movdqa xmm7, [xDX + VMMR0JMPBUF.xmm7 ]
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| 313 | movdqa xmm8, [xDX + VMMR0JMPBUF.xmm8 ]
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| 314 | movdqa xmm9, [xDX + VMMR0JMPBUF.xmm9 ]
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| 315 | movdqa xmm10, [xDX + VMMR0JMPBUF.xmm10]
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| 316 | movdqa xmm11, [xDX + VMMR0JMPBUF.xmm11]
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| 317 | movdqa xmm12, [xDX + VMMR0JMPBUF.xmm12]
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| 318 | movdqa xmm13, [xDX + VMMR0JMPBUF.xmm13]
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| 319 | movdqa xmm14, [xDX + VMMR0JMPBUF.xmm14]
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| 320 | movdqa xmm15, [xDX + VMMR0JMPBUF.xmm15]
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| 321 | %endif
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| 322 | mov rbx, [xDX + VMMR0JMPBUF.rbx]
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| 323 | %ifdef ASM_CALL64_MSC
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| 324 | mov rsi, [xDX + VMMR0JMPBUF.rsi]
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| 325 | mov rdi, [xDX + VMMR0JMPBUF.rdi]
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| 326 | %endif
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| 327 | mov r12, [xDX + VMMR0JMPBUF.r12]
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| 328 | mov r13, [xDX + VMMR0JMPBUF.r13]
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| 329 | mov r14, [xDX + VMMR0JMPBUF.r14]
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| 330 | mov r15, [xDX + VMMR0JMPBUF.r15]
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| 331 | mov rbp, [xDX + VMMR0JMPBUF.rbp]
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| 332 | mov rsp, [xDX + VMMR0JMPBUF.rsp]
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| 333 | push qword [xDX + VMMR0JMPBUF.rflags]
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| 334 | popf
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| 335 | leave
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| 336 | ret
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| 337 |
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| 338 | ;
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| 339 | ; Failure
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| 340 | ;
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| 341 | .nok:
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| 342 | mov eax, VERR_VMM_LONG_JMP_ERROR
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| 343 | %ifdef RT_OS_WINDOWS
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| 344 | add rsp, 0a0h ; skip XMM registers since they are unmodified.
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| 345 | %endif
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| 346 | popf
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| 347 | pop rbx
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| 348 | %ifdef ASM_CALL64_MSC
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| 349 | pop rsi
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| 350 | pop rdi
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| 351 | %endif
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| 352 | pop r12
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| 353 | pop r13
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| 354 | pop r14
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| 355 | pop r15
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| 356 | leave
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| 357 | ret
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| 358 | ENDPROC vmmR0CallRing3LongJmp
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| 359 |
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