| 1 | ; $Id: shforkA-win.asm 2292 2009-02-28 04:46:25Z bird $
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| 2 | ;; @file
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| 3 | ; shforkA-win.asm - assembly routines used when forking on Windows.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (c) 2009 knut st. osmundsen <bird-kBuild-spamix@anduin.net>
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| 8 | ;
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| 9 | ; This file is part of kBuild.
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| 10 | ;
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| 11 | ; kBuild is free software; you can redistribute it and/or modify
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| 12 | ; it under the terms of the GNU General Public License as published by
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| 13 | ; the Free Software Foundation; either version 3 of the License, or
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| 14 | ; (at your option) any later version.
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| 15 | ;
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| 16 | ; kBuild is distributed in the hope that it will be useful,
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| 17 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | ; GNU General Public License for more details.
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| 20 | ;
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| 21 | ; You should have received a copy of the GNU General Public License
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| 22 | ; along with kBuild. If not, see <http://www.gnu.org/licenses/>
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| 23 | ;
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| 24 | ;
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| 25 |
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| 26 | ;*******************************************************************************
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| 27 | ;* Defined Constants And Macros *
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| 28 | ;*******************************************************************************
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| 29 | %ifdef KBUILD_ARCH_AMD64
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| 30 | %define NAME(name) name
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| 31 | %else
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| 32 | %define NAME(name) _ %+ name
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| 33 | %endif
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| 34 |
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| 35 |
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| 36 | ;*******************************************************************************
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| 37 | ;* External Symbols *
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| 38 | ;*******************************************************************************
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| 39 | extern NAME(real_main)
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| 40 | extern NAME(shfork_maybe_forked)
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| 41 | extern NAME(shfork_body)
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| 42 |
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| 43 |
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| 44 | [section .text]
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| 45 |
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| 46 | ;;
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| 47 | ; C main() wrapper.
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| 48 | ;
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| 49 | NAME(main):
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| 50 | global NAME(main)
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| 51 | %ifdef KBUILD_ARCH_AMD64
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| 52 | [proc_frame main]
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| 53 | %endif
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| 54 |
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| 55 | ;
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| 56 | ; Prolog, spilling parameters from registers.
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| 57 | ;
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| 58 | %ifdef KBUILD_ARCH_AMD64
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| 59 | [pushreg rbp]
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| 60 | push rbp
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| 61 | [setframe rbp, 0]
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| 62 | mov rbp, rsp
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| 63 | [allocstack 0x40]
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| 64 | sub rsp, 40h
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| 65 | and rsp, ~1fh
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| 66 | mov [rsp ], rcx ; argc
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| 67 | mov [rsp+ 8h], rdx ; argv
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| 68 | mov [rsp+10h], r8 ; envp
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| 69 | [endprolog]
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| 70 | %else
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| 71 | push ebp
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| 72 | mov ebp, esp
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| 73 | sub esp, 40h
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| 74 | and esp, ~1fh
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| 75 | %endif
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| 76 |
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| 77 | ;
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| 78 | ; Call shfork_maybe_forked. This will not return if we're forking.
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| 79 | ;
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| 80 | %ifndef KBUILD_ARCH_AMD64
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| 81 | mov ecx, [ebp + 8h] ; argc
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| 82 | mov edx, [ebp + 0ch] ; argv
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| 83 | mov eax, [ebp + 10h] ; envp
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| 84 | mov [esp ], ecx
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| 85 | mov [esp + 4h], edx
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| 86 | mov [esp + 8h], eax
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| 87 | %endif
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| 88 | call NAME(shfork_maybe_forked)
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| 89 |
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| 90 | ;
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| 91 | ; Ok, it returned which means we're not forking.
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| 92 | ;
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| 93 | ; The accumulator register is now pointing to the top of the
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| 94 | ; stack we're going to call real_main on. Switch and call it.
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| 95 | ;
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| 96 | ; The TIB adjustments is required or we'll crash in longjmp/unwind.
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| 97 | ;
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| 98 | %ifdef KBUILD_ARCH_AMD64
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| 99 | mov [rsp + 18h], rax
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| 100 | mov [rax - 8h], rsp
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| 101 |
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| 102 | mov r10, [gs:08h] ; StackBase (the higher value)
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| 103 | mov r11, [gs:10h] ; StackLimit (the lower value)
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| 104 | mov [rax - 10h], r10
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| 105 | mov [rax - 18h], r11
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| 106 | cmp rax, r10
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| 107 | jb .below
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| 108 | mov [gs:08h], rax
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| 109 | .below:
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| 110 | lea r9, [rax - 1*1024*1024]
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| 111 | cmp r9, r11
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| 112 | ja .above
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| 113 | mov [gs:10h], r9
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| 114 | .above:
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| 115 |
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| 116 | mov rcx, [rsp ] ; argc
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| 117 | mov rdx, [rsp + 08h] ; argv
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| 118 | mov r8, [rsp + 10h] ; envp
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| 119 |
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| 120 | lea rsp, [eax - 40h] ; Switch!
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| 121 | %else
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| 122 | mov [esp + 18h], eax
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| 123 | mov [eax - 4], esp
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| 124 | lea esp, [eax - 40h] ; Switch!
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| 125 |
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| 126 | mov edx, [fs:04h] ; StackBase (the higher value)
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| 127 | mov ecx, [fs:08h] ; StackLimit (the lower value)
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| 128 | mov [eax - 10h], edx
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| 129 | mov [eax - 18h], ecx
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| 130 | cmp rax, edx
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| 131 | jb .below
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| 132 | mov [fs:04h], rax
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| 133 | .below:
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| 134 | lea edx, [eax - 1*1024*1024]
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| 135 | cmp edx, ecx
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| 136 | ja .above
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| 137 | mov [fs:08h], edx
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| 138 | .above:
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| 139 |
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| 140 | mov ecx, [ebp + 8h] ; argc
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| 141 | mov edx, [ebp + 0ch] ; argv
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| 142 | mov eax, [ebp + 10h] ; envp
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| 143 |
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| 144 | mov [esp ], ecx
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| 145 | mov [esp + 4h], edx
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| 146 | mov [esp + 8h], eax
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| 147 | %endif
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| 148 | call NAME(real_main)
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| 149 |
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| 150 | ;
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| 151 | ; Switch back the stack, restore the TIB fields and we're done.
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| 152 | ;
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| 153 | %ifdef KBUILD_ARCH_AMD64
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| 154 | lea r11, [rsp + 40h]
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| 155 | mov rsp, [rsp + 38h]
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| 156 | mov r8, [r11 - 10h]
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| 157 | mov r9, [r11 - 18h]
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| 158 | mov [gs:08h], r8
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| 159 | mov [gs:10h], r9
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| 160 | %else
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| 161 | lea edx, [esp + 40h]
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| 162 | mov esp, [esp + 2ch]
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| 163 | mov ecx, [edx - 10h]
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| 164 | mov edx, [edx - 18h]
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| 165 | mov [fs:04h], ecx
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| 166 | mov [fs:08h], edx
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| 167 | %endif
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| 168 | leave
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| 169 | ret
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| 170 | %ifdef KBUILD_ARCH_AMD64
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| 171 | [endproc_frame main]
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| 172 | %endif
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| 173 |
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| 174 |
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| 175 | ;;
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| 176 | ; sh_fork() worker
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| 177 | ;
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| 178 | NAME(shfork_do_it):
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| 179 | global NAME(shfork_do_it)
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| 180 | %ifdef KBUILD_ARCH_AMD64
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| 181 | [proc_frame shfork_do_it]
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| 182 | [pushreg rbp]
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| 183 | push rbp
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| 184 | [setframe rbp, 0]
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| 185 | mov rbp, rsp
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| 186 | [allocstack 0x400]
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| 187 | sub rsp, 400h
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| 188 | and rsp, ~1ffh
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| 189 | [endprolog]
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| 190 | %else
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| 191 | push ebp
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| 192 | mov ebp, esp
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| 193 | sub esp, 400h
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| 194 | and esp, ~1ffh
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| 195 | %endif
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| 196 |
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| 197 | ;
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| 198 | ; Save most registers so they can be restored in the child.
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| 199 | ;
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| 200 | %ifdef KBUILD_ARCH_AMD64
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| 201 | fxsave [rsp]
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| 202 | mov [rsp + 200h], rbp
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| 203 | mov [rsp + 208h], rax
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| 204 | mov [rsp + 210h], rbx
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| 205 | mov [rsp + 218h], rcx
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| 206 | mov [rsp + 220h], rdx
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| 207 | mov [rsp + 228h], rsi
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| 208 | mov [rsp + 230h], rdi
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| 209 | mov [rsp + 238h], r8
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| 210 | mov [rsp + 240h], r9
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| 211 | mov [rsp + 248h], r10
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| 212 | mov [rsp + 250h], r11
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| 213 | mov [rsp + 258h], r12
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| 214 | mov [rsp + 260h], r13
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| 215 | mov [rsp + 268h], r14
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| 216 | mov [rsp + 270h], r15
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| 217 | %else
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| 218 | fxsave [esp]
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| 219 | mov [esp + 200h], ebp
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| 220 | mov [esp + 208h], eax
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| 221 | mov [esp + 210h], ebx
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| 222 | mov [esp + 218h], ecx
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| 223 | mov [esp + 220h], edx
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| 224 | mov [esp + 228h], esi
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| 225 | mov [esp + 230h], edi
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| 226 | %endif
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| 227 |
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| 228 | ;
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| 229 | ; Call the shfork_body that will spawn the child and all that.
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| 230 | ;
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| 231 | %ifdef KBUILD_ARCH_AMD64
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| 232 | mov rcx, rsp
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| 233 | %else
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| 234 | mov ecx, esp
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| 235 | sub esp, 20h
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| 236 | mov [esp], ecx
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| 237 | %endif
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| 238 | call NAME(shfork_body)
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| 239 | %ifdef KBUILD_ARCH_AMD64
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| 240 | lea esp, [esp + 20h]
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| 241 | %endif
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| 242 |
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| 243 | ;
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| 244 | ; Just leave the function, no need to restore things.
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| 245 | ;
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| 246 | leave
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| 247 | ret
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| 248 | %ifdef KBUILD_ARCH_AMD64
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| 249 | [endproc_frame shfork_do_it]
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| 250 | %endif
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| 251 |
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| 252 |
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| 253 | ;;
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| 254 | ; Switch the stack, restore the register and leave as if we'd called shfork_do_it.
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| 255 | ;
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| 256 | ; @param cur Current stack pointer.
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| 257 | ; @param base The stack base (higher value).
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| 258 | ; @param limit The stack limit (lower value).
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| 259 | ;
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| 260 | NAME(shfork_resume):
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| 261 | global NAME(shfork_resume)
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| 262 | %ifdef KBUILD_ARCH_AMD64
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| 263 | mov rsp, rcx
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| 264 | %else
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| 265 | mov ecx, [esp + 4]
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| 266 | mov edx, [esp + 8]
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| 267 | mov eax, [esp + 12]
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| 268 | mov esp, ecx
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| 269 | %endif
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| 270 |
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| 271 | ;
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| 272 | ; Adjust stack stuff in the TIB (longjmp/unwind).
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| 273 | ;
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| 274 | %ifdef KBUILD_ARCH_AMD64
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| 275 | cmp rdx, [gs:08h] ; StackBase (the higher value)
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| 276 | jb .below
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| 277 | mov [gs:08h], rdx
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| 278 | .below:
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| 279 | cmp r8, [gs:10h] ; StackLimit
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| 280 | ja .above
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| 281 | mov [gs:10h], r8
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| 282 | .above:
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| 283 | %else
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| 284 | cmp edx, [fs:04h] ; StackBase (the higher value)
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| 285 | jb .below
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| 286 | mov [fs:04h], edx
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| 287 | .below:
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| 288 | cmp eax, [fs:08h] ; StackLimit
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| 289 | ja .above
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| 290 | mov [fs:08h], eax
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| 291 | .above:
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| 292 | %endif
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| 293 |
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| 294 | ;
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| 295 | ; Restore most of the registers.
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| 296 | ;
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| 297 | ;; @todo xmm registers may require explicit saving/restoring...
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| 298 | %ifdef KBUILD_ARCH_AMD64
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| 299 | frstor [rsp]
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| 300 | mov rbp, [rsp + 200h]
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| 301 | mov rax, [rsp + 208h]
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| 302 | mov rbx, [rsp + 210h]
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| 303 | mov rcx, [rsp + 218h]
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| 304 | mov rdx, [rsp + 220h]
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| 305 | mov rsi, [rsp + 228h]
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| 306 | mov rdi, [rsp + 230h]
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| 307 | mov r8, [rsp + 238h]
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| 308 | mov r9, [rsp + 240h]
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| 309 | mov r10, [rsp + 248h]
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| 310 | mov r11, [rsp + 250h]
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| 311 | mov r12, [rsp + 258h]
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| 312 | mov r13, [rsp + 260h]
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| 313 | mov r14, [rsp + 268h]
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| 314 | mov r15, [rsp + 270h]
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| 315 | %else
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| 316 | frstor [esp]
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| 317 | mov ebp, [esp + 200h]
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| 318 | mov eax, [esp + 208h]
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| 319 | mov ebx, [esp + 210h]
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| 320 | mov ecx, [esp + 218h]
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| 321 | mov edx, [esp + 220h]
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| 322 | mov esi, [esp + 228h]
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| 323 | mov edi, [esp + 230h]
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| 324 | %endif
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| 325 | xor eax, eax ; the child returns 0.
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| 326 | leave
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| 327 | ret
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| 328 |
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