2020-06-16 13:38:43 +00:00
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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2020-06-15 14:18:57 +00:00
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/macros.h"
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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2020-06-15 14:18:57 +00:00
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/* ▄▄▄
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▄▄▄ ▀▓▓▒▄
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▄▓▒▒░ ▀▓▒▒▒▄
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▄▓▓▓▒▀ ▄▄▄▄ ▒▓▒▒░▒▄
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▄▓▓▓▒▓ ▄▄▓██▓▓▓▓▒▒▒▒▓▓▄▄▓▓▒▒▒░░▒
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▓▓▓▓▒▒▒▄▄ ░▒█▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓▒░░▒░
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██▓▓▓▒▒░░▒▒▒▒▓▓▓▓▓▓▒▓▒░▒▒░▀▒▒▒▒░▀░▒▒▒░▒
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▓▓▓▓▓▓▓▒▒▒▒▒▒▓▓▒▓▓▒▒▒░▒▒░░ ░▒▒░ ░▒▒▒▒
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▀▓▓█▓▓▓▓▓▓▓▓▓▓▒▒░░▒▒░░ ░░░▓░ ▓░░░▒
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▀▀█▓███▓▓▓▓▓▒▒░░░▒░░ ░█▓░█▓░█▓▓▄▒░
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░▓██▓▓▓▓▓▒▒░░░▒░░ ░████▓▒▓█▓▀░▀▄
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░▓██▓▓▓▓▓▒▒▒░░░▒░░ ▒██▓▒▒▒▒▒▒░░░▒
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████▓▓▓▓▓▒▒▒▒▒▒▒▒▒░░▒▓▓▒░░░░▒░░░▒░ ░░░░░
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░▓███▓▓▓▓▓▒▒░░░░░░░▒▒▒▒▒▒▒▒▒▒▒░░░ ░░░░░ ░
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▓███▓▓▓▓▓▒▓▒▒▒▒░░░░░░░░░▒▓▒▒░▀ ░░░ ░░░░░
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▀▒██▓▓▓▓▒▒▒▓▓▓▓▒▒▒▒▒▒▒▓▀▀░ ░░░░░░░░░ ░
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▓▓▓▓▓▓▓▒▓▒▒▒▒▓▓▓▒▀░ ░░░░░▄░░░ ░░░ ░░░░░░
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▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓ █▓▒░░▒░░░░ ░░░░░░░░
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░▓█▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒░░░▒ besiyata
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▓▓█▓▓▒▓▓▓▒▒▒░░░░░░▒▓▓▓▓▒▒▒▒▒░ dishmaya
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▄▄▄░▒▓▓▓▓▓▓░▀▀ ▓▓▒░▓▒▒▒▒▒▒▒▒▒▒▄░░▀▀░░ ▄▄▄▄
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▄▄▄▒▒▓▓█▓▓▓▓▓▀▀▀▀▀ ▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▀░░▀░░▒▒▒░░░ ░░░░░
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▄▓▓▓▒▀▀ ▓▒▓▓▓▓▓▒▒▒▒▒▒▒▒▓░░░ ▒▒▒░░░░░░░░▒
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█▓▓▒ ▄▄▄ ▀▓▒▓▒▒▒▓▓▓▓▓▓▒▒▒░░░░░░░░░▒▒░░░░░░░
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▀▓▓▓▓▒▄▄▒▒▒▒▒▒▄▄ ▀▀▀▀░░▒▒▒▒░░░░░░
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▀▀▀▓▓▓▓▒▒▒▒▒▓▓▄▄
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╔────────────────────────────────────────────────────────────────────────────│─╗
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│ cosmopolitan § bell system five » system call support ─╬─│┼
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╚────────────────────────────────────────────────────────────────────────────│*/
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/ Performs System Five System Call.
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/
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/ Cosmopolitan is designed to delegate all function calls into the
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/ Linux, FreeBSD, OpenBSD, and XNU kernels through this function,
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/ with few exceptions. This function is intended to be called via
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/ generated thunks in the libc/sysv/syscalls/ directory.
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/
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/ It's safe to call this function on Windows, where it'll always
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/ return -1 w/ errno == ENOSYS. Further note that -1 is the only
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/ return value that means error, a common anti-pattern is to check
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/ for values less than 0 (which is more problematic on 32-bit).
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/
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/ It's important to consider that system calls are an order of a
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/ magnitude more expensive than normal function calls. For example
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/ getpid() on Linux usually takes 500ns, and cached i/o calls will
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/ take 1µs or more.
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/
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/ @param %rax function ordinal supplied by jump slot
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/ @param %rdi,%rsi,%rdx,%rcx,%r8,%r9 and rest on stack
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/ @return %rax:%rdx is result, or -1 w/ errno on error
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/ @clob %rcx,%r10,%r11
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/ @see syscalls.sh
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.initbss 300,_init_systemfive
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hostos: .quad 0
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.endobj hostos,globl,hidden
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systemfive:
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.quad 0
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.endobj systemfive,globl,hidden
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.previous
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.Lanchorpoint:
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systemfive.linux:
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movswl %ax,%eax
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test %eax,%eax
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js systemfive.enosys
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mov %rcx,%r10
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2020-08-25 11:23:25 +00:00
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push %rbp
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mov %rsp,%rbp
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2020-06-15 14:18:57 +00:00
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syscall
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2020-08-25 11:23:25 +00:00
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pop %rbp
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2020-06-15 14:18:57 +00:00
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cmp $-4095,%rax
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jae systemfive.error
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ret
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2020-10-11 04:18:53 +00:00
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.endfn systemfive.linux,globl,hidden
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2020-06-15 14:18:57 +00:00
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systemfive.error:
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neg %eax
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/ 𝑠𝑙𝑖𝑑𝑒
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2020-10-27 10:39:46 +00:00
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.endfn systemfive.error,globl,hidden
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2020-06-15 14:18:57 +00:00
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systemfive.errno:
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mov %eax,errno(%rip)
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2020-10-11 04:18:53 +00:00
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push $-1
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pop %rax
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2020-06-15 14:18:57 +00:00
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stc
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ret
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2020-10-27 10:39:46 +00:00
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.endfn systemfive.errno,globl,hidden
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2020-06-15 14:18:57 +00:00
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systemfive.enosys:
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mov ENOSYS(%rip),%eax
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jmp systemfive.errno
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2020-10-27 10:39:46 +00:00
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.endfn systemfive.enosys,globl,hidden
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2020-06-15 14:18:57 +00:00
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systemfive.openbsd:
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shr $48,%rax
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jmp systemfive.bsd
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2020-10-11 04:18:53 +00:00
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.endfn systemfive.openbsd,globl,hidden
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2020-06-15 14:18:57 +00:00
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systemfive.freebsd:
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shr $32,%rax
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movzwl %ax,%eax
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/ 𝑠𝑙𝑖𝑑𝑒
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2020-10-11 04:18:53 +00:00
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.endfn systemfive.freebsd,globl,hidden
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2020-06-15 14:18:57 +00:00
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systemfive.bsd:
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cmp $0xfff,%ax
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jae systemfive.enosys
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mov %rcx,%r10
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2020-08-25 11:23:25 +00:00
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push %rbp
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mov %rsp,%rbp
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2020-06-15 14:18:57 +00:00
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syscall
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2020-08-25 11:23:25 +00:00
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pop %rbp
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2020-06-15 14:18:57 +00:00
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jc systemfive.errno
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ret
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2020-10-11 04:18:53 +00:00
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.endfn systemfive.bsd
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2020-06-15 14:18:57 +00:00
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systemfive.xnu:
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2020-10-11 04:18:53 +00:00
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/ do this to rax
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/ 0x????????2153????
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/ │└┴┴─┐
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/ └┐ ├┬┐
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/ 0x0000000002000153
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2020-06-15 14:18:57 +00:00
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mov %eax,%r11d
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2020-10-11 04:18:53 +00:00
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shr $4*7,%r11d
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shl $4*6,%r11d
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shl $4*1,%eax
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shr $4*5,%eax
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2020-06-15 14:18:57 +00:00
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or %r11d,%eax
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jmp systemfive.bsd
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.endfn systemfive.xnu,globl,hidden
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.previous
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/ Initializes System Five system call support.
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/
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/ (1) Extracts parameters passed by kernel,
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/ (2) Detects O/S without issuing system calls,
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/ (3) Unpacks numbers.
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/
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/ @param %r15 is auxv
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/ @note OpenBSD devs: let us know if you start using auxv
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.init.start 300,_init_systemfive
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push %rbx
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push %rsi
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2020-10-29 11:53:20 +00:00
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testb $METAL,(%rdi) # @see ape/ape.S
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jnz systemfive.init.metal
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2020-06-15 14:18:57 +00:00
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testb $XNU,(%rdi) # @see libc/crt/crt.S
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2020-08-25 11:23:25 +00:00
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jnz systemfive.init.xnu
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2020-06-15 14:18:57 +00:00
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testb $FREEBSD,(%rdi) # @see libc/crt/crt.S
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2020-08-25 11:23:25 +00:00
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jnz systemfive.init.freebsd
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2020-06-15 14:18:57 +00:00
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testb $WINDOWS,(%rdi) # @see libc/runtime/winmain.c
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2020-08-25 11:23:25 +00:00
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jnz systemfive.init.windows
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2020-06-15 14:18:57 +00:00
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cmpq $0,(%r15) # OpenBSD doesn't have auxv
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2020-08-25 11:23:25 +00:00
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je systemfive.init.openbsd
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2020-06-15 14:18:57 +00:00
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/ default state is safe state
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/ 𝑠𝑙𝑖𝑑𝑒
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2020-08-25 11:23:25 +00:00
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systemfive.init.linux:
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2020-06-15 14:18:57 +00:00
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pushb systemfive.linux-.Lanchorpoint
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push $LINUX
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ezlea syscon.linux,si
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2020-08-25 11:23:25 +00:00
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jmp systemfive.init.os
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2020-10-29 11:53:20 +00:00
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systemfive.init.metal:
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pushb systemfive.linux-.Lanchorpoint
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push $METAL
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ezlea syscon.linux,si
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jmp systemfive.init.os
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2020-08-25 11:23:25 +00:00
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systemfive.init.windows:
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2020-06-15 14:18:57 +00:00
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pushb systemfive.enosys-.Lanchorpoint
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push $WINDOWS
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ezlea syscon.windows,si
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2020-08-25 11:23:25 +00:00
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jmp systemfive.init.os
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systemfive.init.freebsd:
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2020-06-15 14:18:57 +00:00
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pushb systemfive.freebsd-.Lanchorpoint
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push $FREEBSD
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ezlea syscon.freebsd,si
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2020-08-25 11:23:25 +00:00
|
|
|
|
jmp systemfive.init.os
|
|
|
|
|
|
systemfive.init.openbsd:
|
2020-06-15 14:18:57 +00:00
|
|
|
|
pushb systemfive.openbsd-.Lanchorpoint
|
|
|
|
|
|
push $OPENBSD
|
|
|
|
|
|
ezlea syscon.openbsd,si
|
2020-08-25 11:23:25 +00:00
|
|
|
|
jmp systemfive.init.os
|
|
|
|
|
|
systemfive.init.xnu:
|
2020-06-15 14:18:57 +00:00
|
|
|
|
pushb systemfive.xnu-.Lanchorpoint
|
|
|
|
|
|
push $XNU
|
|
|
|
|
|
ezlea syscon.xnu,si
|
|
|
|
|
|
/ 𝑠𝑙𝑖𝑑𝑒
|
2020-08-25 11:23:25 +00:00
|
|
|
|
systemfive.init.os:
|
2020-06-15 14:18:57 +00:00
|
|
|
|
ezlea .Lanchorpoint,cx
|
|
|
|
|
|
pop %rax
|
|
|
|
|
|
stosq #→ hostos
|
|
|
|
|
|
pop %rax
|
|
|
|
|
|
add %rcx,%rax
|
|
|
|
|
|
stosq #→ systemfive
|
|
|
|
|
|
push %rdi
|
2020-08-25 11:23:25 +00:00
|
|
|
|
ezlea syscon.start,di
|
|
|
|
|
|
ezlea syscon.end,bx
|
|
|
|
|
|
call systemfive.sleb128unpacker
|
|
|
|
|
|
pop %rdi
|
|
|
|
|
|
/ 𝑠𝑙𝑖𝑑𝑒
|
|
|
|
|
|
systemfive.init.done:
|
|
|
|
|
|
pop %rsi
|
|
|
|
|
|
pop %rbx
|
|
|
|
|
|
.init.end 300,_init_systemfive,globl,hidden
|
|
|
|
|
|
|
|
|
|
|
|
.text.startup
|
|
|
|
|
|
systemfive.sleb128unpacker:
|
|
|
|
|
|
.leafprologue
|
|
|
|
|
|
or $-1,%r9
|
2020-06-15 14:18:57 +00:00
|
|
|
|
2: cmp %rbx,%rdi
|
|
|
|
|
|
jnb 5f
|
|
|
|
|
|
xor %ecx,%ecx
|
|
|
|
|
|
xor %edx,%edx
|
|
|
|
|
|
3: lodsb
|
|
|
|
|
|
mov %rax,%r8
|
|
|
|
|
|
and $127,%r8d
|
|
|
|
|
|
sal %cl,%r8
|
|
|
|
|
|
add $7,%ecx
|
|
|
|
|
|
or %r8,%rdx
|
|
|
|
|
|
test %al,%al
|
|
|
|
|
|
js 3b
|
|
|
|
|
|
test $64,%al
|
|
|
|
|
|
je 4f
|
|
|
|
|
|
mov %r9,%rax
|
|
|
|
|
|
sal %cl,%rax
|
|
|
|
|
|
or %rax,%rdx
|
|
|
|
|
|
4: mov %rdx,%rax
|
|
|
|
|
|
cmpq $0,(%rdi) # don't change consts already set
|
|
|
|
|
|
cmovne (%rdi),%rax # @see WinMain() for example
|
|
|
|
|
|
stosq
|
|
|
|
|
|
jmp 2b
|
2020-08-25 11:23:25 +00:00
|
|
|
|
5: .leafepilogue
|
|
|
|
|
|
.previous
|
2020-06-15 14:18:57 +00:00
|
|
|
|
|
|
|
|
|
|
/ Sections for varint encoded numbers.
|
|
|
|
|
|
/
|
|
|
|
|
|
/ These sections are all ordered by (group_name, constant_name).
|
|
|
|
|
|
/ They're populated by modules simply referencing the symbols.
|
|
|
|
|
|
/
|
|
|
|
|
|
/ @see libc/sysv/consts.sh
|
|
|
|
|
|
/ @see libc/sysv/consts/syscon.h
|
|
|
|
|
|
.section .piro.bss.sort.syscon.1,"aw",@nobits
|
|
|
|
|
|
.align 8
|
2020-08-25 11:23:25 +00:00
|
|
|
|
syscon.start:/*
|
2020-06-15 14:18:57 +00:00
|
|
|
|
...decentralized quadwords...
|
|
|
|
|
|
*/.previous
|
|
|
|
|
|
.section .piro.bss.sort.syscon.3,"aw",@nobits
|
2020-08-25 11:23:25 +00:00
|
|
|
|
syscon.end:
|
2020-06-15 14:18:57 +00:00
|
|
|
|
.previous
|
|
|
|
|
|
.section .sort.rodata.syscon.linux.1,"a",@progbits
|
|
|
|
|
|
.align 1
|
|
|
|
|
|
syscon.linux:/*
|
|
|
|
|
|
...decentralized leb128...
|
|
|
|
|
|
*/.previous
|
|
|
|
|
|
.section .sort.rodata.syscon.xnu.1,"a",@progbits
|
|
|
|
|
|
.align 1
|
|
|
|
|
|
syscon.xnu:/*
|
|
|
|
|
|
...decentralized leb128...
|
|
|
|
|
|
*/.previous
|
|
|
|
|
|
.section .sort.rodata.syscon.freebsd.1,"a",@progbits
|
|
|
|
|
|
.align 1
|
|
|
|
|
|
syscon.freebsd:/*
|
|
|
|
|
|
...decentralized leb128...
|
|
|
|
|
|
*/.previous
|
|
|
|
|
|
.section .sort.rodata.syscon.openbsd.1,"a",@progbits
|
|
|
|
|
|
.align 1
|
|
|
|
|
|
syscon.openbsd:/*
|
|
|
|
|
|
...decentralized leb128...
|
|
|
|
|
|
*/.previous
|
|
|
|
|
|
.section .sort.rodata.syscon.windows.1,"a",@progbits
|
|
|
|
|
|
.align 1
|
|
|
|
|
|
syscon.windows:/*
|
|
|
|
|
|
...decentralized leb128...
|
|
|
|
|
|
*/.previous
|
2020-08-25 11:23:25 +00:00
|
|
|
|
|
|
|
|
|
|
.type syscon.start,@object
|
|
|
|
|
|
.type syscon.end,@object
|
2020-06-15 14:18:57 +00:00
|
|
|
|
.type syscon.linux,@object
|
|
|
|
|
|
.type syscon.xnu,@object
|
|
|
|
|
|
.type syscon.freebsd,@object
|
|
|
|
|
|
.type syscon.openbsd,@object
|
|
|
|
|
|
.type syscon.windows,@object
|
2020-08-25 11:23:25 +00:00
|
|
|
|
|
|
|
|
|
|
.globl syscon.start
|
|
|
|
|
|
.globl syscon.end
|
|
|
|
|
|
.globl syscon.linux
|
|
|
|
|
|
.globl syscon.xnu
|
|
|
|
|
|
.globl syscon.freebsd
|
|
|
|
|
|
.globl syscon.openbsd
|
|
|
|
|
|
.globl syscon.windows
|
