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https://gitlab.com/sortix/sortix.git
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77 lines
2.2 KiB
ArmAsm
77 lines
2.2 KiB
ArmAsm
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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x64/fork.S
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Assembly functions related to forking x64 processes.
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*******************************************************************************/
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#define MSRID_FSBASE 0xC0000100
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#define MSRID_GSBASE 0xC0000101
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.section .text
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.globl __sfork
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.type __sfork, @function
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__sfork:
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pushq %rbp
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movq %rsp, %rbp
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pushq %rdi
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pushq %rsi
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movq $.Lafter_fork, (0 * 8)(%rsi) # rip
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movq $0, (1 * 8)(%rsi) # rax, result is 0 for child
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movq %rbx, (2 * 8)(%rsi)
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movq %rcx, (3 * 8)(%rsi)
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movq %rdx, (4 * 8)(%rsi)
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movq %rdi, (5 * 8)(%rsi)
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movq %rsi, (6 * 8)(%rsi)
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movq %rsp, (7 * 8)(%rsi)
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movq %rbp, (8 * 8)(%rsi)
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movq %r8, (9 * 8)(%rsi)
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movq %r9, (10 * 8)(%rsi)
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movq %r10, (11 * 8)(%rsi)
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movq %r11, (12 * 8)(%rsi)
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movq %r12, (13 * 8)(%rsi)
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movq %r13, (14 * 8)(%rsi)
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movq %r14, (15 * 8)(%rsi)
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movq %r15, (16 * 8)(%rsi)
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pushfq
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popq %rax
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movq %rax, (17 * 8)(%rsi) # rflags
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movl $MSRID_FSBASE, %edi
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call rdmsr
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movq 0(%rsp), %rsi
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movq %rax, (18 * 8)(%rsi) # fsbase
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movl $MSRID_GSBASE, %edi
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call rdmsr
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movq 0(%rsp), %rsi
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movq %rax, (19 * 8)(%rsi) # gsbase
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movq 8(%rsp), %rdi
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call tfork
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.Lafter_fork:
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# The value in %rax determines whether we are child or parent. There is no
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# need to clean up the stack from the above pushes, leaveq sets %rsp to %rbp
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# which does that for us.
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leaveq
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retq
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.size __sfork, . - __sfork
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