| 1 | ; $Id: shforkA-win.asm 2294 2009-02-28 08:33:26Z 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 <[email protected]>
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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 | ;; The stack size. This is also defined in shfork-win.c.
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| 36 | %define SHFORK_STACK_SIZE (1*1024*1024)
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| 37 |
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| 38 |
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| 39 | ;*******************************************************************************
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| 40 | ;* External Symbols *
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| 41 | ;*******************************************************************************
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| 42 | extern NAME(real_main)
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| 43 | extern NAME(shfork_maybe_forked)
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| 44 | extern NAME(shfork_body)
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| 45 |
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| 46 |
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| 47 | [section .text]
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| 48 |
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| 49 | ;;
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| 50 | ; C main() wrapper.
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| 51 | ;
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| 52 | NAME(main):
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| 53 | global NAME(main)
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| 54 | %ifdef KBUILD_ARCH_AMD64
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| 55 | [proc_frame main]
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| 56 | %endif
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| 57 |
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| 58 | ;
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| 59 | ; Prolog, spilling parameters from registers.
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| 60 | ;
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| 61 | %ifdef KBUILD_ARCH_AMD64
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| 62 | [pushreg rbp]
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| 63 | push rbp
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| 64 | [setframe rbp, 0]
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| 65 | mov rbp, rsp
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| 66 | [allocstack 0x40]
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| 67 | sub rsp, 40h
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| 68 | and rsp, ~1fh
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| 69 | mov [rsp ], rcx ; argc
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| 70 | mov [rsp+ 8h], rdx ; argv
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| 71 | mov [rsp+10h], r8 ; envp
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| 72 | [endprolog]
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| 73 | %else
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| 74 | push ebp
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| 75 | mov ebp, esp
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| 76 | sub esp, 40h
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| 77 | and esp, ~1fh
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| 78 | %endif
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| 79 |
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| 80 | ;
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| 81 | ; Call shfork_maybe_forked. This will not return if we're forking.
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| 82 | ;
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| 83 | %ifndef KBUILD_ARCH_AMD64
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| 84 | mov ecx, [ebp + 8h] ; argc
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| 85 | mov edx, [ebp + 0ch] ; argv
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| 86 | mov eax, [ebp + 10h] ; envp
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| 87 | mov [esp ], ecx
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| 88 | mov [esp + 4h], edx
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| 89 | mov [esp + 8h], eax
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| 90 | %endif
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| 91 | call NAME(shfork_maybe_forked)
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| 92 |
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| 93 | ;
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| 94 | ; Ok, it returned which means we're not forking.
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| 95 | ;
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| 96 | ; The accumulator register is now pointing to the top of the
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| 97 | ; stack we're going to call real_main on. Switch and call it.
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| 98 | ;
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| 99 | ; The TIB adjustments is required or we'll crash in longjmp/unwind.
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| 100 | ;
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| 101 | %ifdef KBUILD_ARCH_AMD64
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| 102 | mov [rsp + 18h], rax
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| 103 | mov [rax - 8h], rsp
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| 104 |
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| 105 | mov r10, [gs:08h] ; StackBase (the higher value)
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| 106 | mov r11, [gs:10h] ; StackLimit (the lower value)
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| 107 | mov [rax - 10h], r10
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| 108 | mov [rax - 18h], r11
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| 109 | int3
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| 110 | cmp rax, r10
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| 111 | jb .below
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| 112 | mov [gs:08h], rax
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| 113 | .below:
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| 114 | lea r9, [rax - SHFORK_STACK_SIZE]
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| 115 | cmp r9, r11
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| 116 | ja .above
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| 117 | mov [gs:10h], r9
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| 118 | .above:
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| 119 |
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| 120 | mov rcx, [rsp ] ; argc
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| 121 | mov rdx, [rsp + 08h] ; argv
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| 122 | mov r8, [rsp + 10h] ; envp
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| 123 |
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| 124 | lea rsp, [eax - 40h] ; Switch!
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| 125 | %else
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| 126 | mov [esp + 18h], eax
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| 127 | mov [eax - 4], esp
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| 128 | lea esp, [eax - 40h] ; Switch!
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| 129 |
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| 130 | mov edx, [fs:04h] ; StackBase (the higher value)
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| 131 | mov ecx, [fs:08h] ; StackLimit (the lower value)
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| 132 | mov [eax - 10h], edx
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| 133 | mov [eax - 18h], ecx
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| 134 | cmp rax, edx
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| 135 | jb .below
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| 136 | mov [fs:04h], rax
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| 137 | .below:
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| 138 | lea edx, [eax - SHFORK_STACK_SIZE]
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| 139 | cmp edx, ecx
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| 140 | ja .above
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| 141 | mov [fs:08h], edx
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| 142 | .above:
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| 143 |
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| 144 | mov ecx, [ebp + 8h] ; argc
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| 145 | mov edx, [ebp + 0ch] ; argv
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| 146 | mov eax, [ebp + 10h] ; envp
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| 147 |
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| 148 | mov [esp ], ecx
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| 149 | mov [esp + 4h], edx
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| 150 | mov [esp + 8h], eax
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| 151 | %endif
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| 152 | call NAME(real_main)
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| 153 |
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| 154 | ;
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| 155 | ; Switch back the stack, restore the TIB fields and we're done.
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| 156 | ;
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| 157 | %ifdef KBUILD_ARCH_AMD64
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| 158 | lea r11, [rsp + 40h]
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| 159 | mov rsp, [rsp + 38h]
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| 160 | mov r8, [r11 - 10h]
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| 161 | mov r9, [r11 - 18h]
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| 162 | mov [gs:08h], r8
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| 163 | mov [gs:10h], r9
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| 164 | %else
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| 165 | lea edx, [esp + 40h]
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| 166 | mov esp, [esp + 2ch]
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| 167 | mov ecx, [edx - 10h]
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| 168 | mov edx, [edx - 18h]
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| 169 | mov [fs:04h], ecx
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| 170 | mov [fs:08h], edx
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| 171 | %endif
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| 172 | leave
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| 173 | ret
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| 174 | %ifdef KBUILD_ARCH_AMD64
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| 175 | [endproc_frame main]
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| 176 | %endif
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| 177 |
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| 178 |
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| 179 | ;;
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| 180 | ; sh_fork() worker
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| 181 | ;
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| 182 | ; @returns See fork().
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| 183 | ; @param psh
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| 184 | ;
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| 185 | NAME(shfork_do_it):
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| 186 | global NAME(shfork_do_it)
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| 187 | %ifdef KBUILD_ARCH_AMD64
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| 188 | [proc_frame shfork_do_it]
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| 189 | [pushreg rbp]
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| 190 | push rbp
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| 191 | [setframe rbp, 0]
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| 192 | mov rbp, rsp
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| 193 | [allocstack 0x400]
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| 194 | sub rsp, 400h
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| 195 | and rsp, ~1ffh
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| 196 | [endprolog]
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| 197 | %else
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| 198 | push ebp
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| 199 | mov ebp, esp
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| 200 | sub esp, 400h
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| 201 | and esp, ~1ffh
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| 202 | %endif
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| 203 |
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| 204 | ;
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| 205 | ; Save most registers so they can be restored in the child.
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| 206 | ;
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| 207 | %ifdef KBUILD_ARCH_AMD64
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| 208 | fxsave [rsp]
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| 209 | mov [rsp + 200h], rbp
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| 210 | mov [rsp + 208h], rax
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| 211 | mov [rsp + 210h], rbx
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| 212 | mov [rsp + 218h], rcx
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| 213 | mov [rsp + 220h], rdx
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| 214 | mov [rsp + 228h], rsi
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| 215 | mov [rsp + 230h], rdi
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| 216 | mov [rsp + 238h], r8
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| 217 | mov [rsp + 240h], r9
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| 218 | mov [rsp + 248h], r10
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| 219 | mov [rsp + 250h], r11
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| 220 | mov [rsp + 258h], r12
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| 221 | mov [rsp + 260h], r13
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| 222 | mov [rsp + 268h], r14
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| 223 | mov [rsp + 270h], r15
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| 224 | %else
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| 225 | fxsave [esp]
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| 226 | mov [esp + 200h], ebp
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| 227 | mov [esp + 208h], eax
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| 228 | mov [esp + 210h], ebx
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| 229 | mov [esp + 218h], ecx
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| 230 | mov [esp + 220h], edx
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| 231 | mov [esp + 228h], esi
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| 232 | mov [esp + 230h], edi
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| 233 | %endif
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| 234 |
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| 235 | ;
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| 236 | ; Call the shfork_body that will spawn the child and all that.
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| 237 | ;
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| 238 | %ifdef KBUILD_ARCH_AMD64
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| 239 | ;mov rcx, rcx ; psh
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| 240 | mov rdx, rsp ; stack_ptr
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| 241 | sub rsp, 20h
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| 242 | call NAME(shfork_body)
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| 243 | lea rsp, [rsp + 20h]
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| 244 | %else
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| 245 | mov edx, esp
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| 246 | mov ecx, [ebp + 8h] ; psh
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| 247 | sub esp, 20h
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| 248 | mov [esp ], edx
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| 249 | mov [esp + 4], ecx ; stack_ptr
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| 250 | call NAME(shfork_body)
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| 251 | lea esp, [esp + 20h]
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| 252 | %endif
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| 253 |
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| 254 | ;
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| 255 | ; Just leave the function, no need to restore things.
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| 256 | ;
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| 257 | leave
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| 258 | ret
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| 259 | %ifdef KBUILD_ARCH_AMD64
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| 260 | [endproc_frame shfork_do_it]
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| 261 | %endif
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| 262 |
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| 263 |
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| 264 | ;;
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| 265 | ; Switch the stack, restore the register and leave as if we'd called shfork_do_it.
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| 266 | ;
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| 267 | ; @param cur Current stack pointer.
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| 268 | ; @param base The stack base (higher value).
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| 269 | ; @param limit The stack limit (lower value).
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| 270 | ;
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| 271 | NAME(shfork_resume):
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| 272 | global NAME(shfork_resume)
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| 273 | %ifdef KBUILD_ARCH_AMD64
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| 274 | mov rsp, rcx
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| 275 | %else
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| 276 | mov ecx, [esp + 4]
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| 277 | mov edx, [esp + 8]
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| 278 | mov eax, [esp + 12]
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| 279 | mov esp, ecx
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| 280 | %endif
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| 281 |
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| 282 | ;
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| 283 | ; Adjust stack stuff in the TIB (longjmp/unwind).
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| 284 | ;
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| 285 | %ifdef KBUILD_ARCH_AMD64
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| 286 | cmp rdx, [gs:08h] ; StackBase (the higher value)
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| 287 | jb .below
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| 288 | mov [gs:08h], rdx
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| 289 | .below:
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| 290 | cmp r8, [gs:10h] ; StackLimit
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| 291 | ja .above
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| 292 | mov [gs:10h], r8
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| 293 | .above:
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| 294 | %else
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| 295 | cmp edx, [fs:04h] ; StackBase (the higher value)
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| 296 | jb .below
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| 297 | mov [fs:04h], edx
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| 298 | .below:
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| 299 | cmp eax, [fs:08h] ; StackLimit
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| 300 | ja .above
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| 301 | mov [fs:08h], eax
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| 302 | .above:
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| 303 | %endif
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| 304 |
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| 305 | ;
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| 306 | ; Restore most of the registers.
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| 307 | ;
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| 308 | ;; @todo xmm registers may require explicit saving/restoring...
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| 309 | %ifdef KBUILD_ARCH_AMD64
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| 310 | frstor [rsp]
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| 311 | mov rbp, [rsp + 200h]
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| 312 | mov rax, [rsp + 208h]
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| 313 | mov rbx, [rsp + 210h]
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| 314 | mov rcx, [rsp + 218h]
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| 315 | mov rdx, [rsp + 220h]
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| 316 | mov rsi, [rsp + 228h]
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| 317 | mov rdi, [rsp + 230h]
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| 318 | mov r8, [rsp + 238h]
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| 319 | mov r9, [rsp + 240h]
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| 320 | mov r10, [rsp + 248h]
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| 321 | mov r11, [rsp + 250h]
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| 322 | mov r12, [rsp + 258h]
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| 323 | mov r13, [rsp + 260h]
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| 324 | mov r14, [rsp + 268h]
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| 325 | mov r15, [rsp + 270h]
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| 326 | %else
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| 327 | frstor [esp]
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| 328 | mov ebp, [esp + 200h]
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| 329 | mov eax, [esp + 208h]
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| 330 | mov ebx, [esp + 210h]
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| 331 | mov ecx, [esp + 218h]
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| 332 | mov edx, [esp + 220h]
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| 333 | mov esi, [esp + 228h]
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| 334 | mov edi, [esp + 230h]
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| 335 | %endif
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| 336 | xor eax, eax ; the child returns 0.
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| 337 | leave
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| 338 | ret
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| 339 |
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