314 lines
12 KiB
ArmAsm
314 lines
12 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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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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.source __FILE__
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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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▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓ █▓▒░░▒░░░░ ░░░░░░░░
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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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▄░▓▓▓▓▓▓▀▒▓▓▓▒▒▓▒░░░▒▓▒░░░▓
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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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push %rbp
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mov %rsp,%rbp
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syscall
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pop %rbp
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cmp $-4095,%rax
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jae systemfive.error
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ret
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.endfn systemfive.linux,globl,hidden
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systemfive.error:
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neg %eax
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/ 𝑠𝑙𝑖𝑑𝑒
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.endfn systemfive.error,globl,hidden
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systemfive.errno:
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mov %eax,errno(%rip)
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push $-1
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pop %rax
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stc
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ret
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.endfn systemfive.errno,globl,hidden
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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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.endfn systemfive.enosys,globl,hidden
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systemfive.openbsd:
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shr $48,%rax
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jmp systemfive.bsd
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.endfn systemfive.openbsd,globl,hidden
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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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.endfn systemfive.freebsd,globl,hidden
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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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push %rbp
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mov %rsp,%rbp
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syscall
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pop %rbp
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jc systemfive.errno
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ret
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.endfn systemfive.bsd
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systemfive.xnu:
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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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mov %eax,%r11d
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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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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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testb $METAL,(%rdi) # @see ape/ape.S
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jnz systemfive.init.metal
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testb $XNU,(%rdi) # @see libc/crt/crt.S
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jnz systemfive.init.xnu
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testb $FREEBSD,(%rdi) # @see libc/crt/crt.S
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jnz systemfive.init.freebsd
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testb $WINDOWS,(%rdi) # @see libc/runtime/winmain.c
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jnz systemfive.init.windows
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cmpq $0,(%r15) # OpenBSD doesn't have auxv
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je systemfive.init.openbsd
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/ default state is safe state
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/ 𝑠𝑙𝑖𝑑𝑒
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systemfive.init.linux:
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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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jmp systemfive.init.os
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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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systemfive.init.windows:
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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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jmp systemfive.init.os
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systemfive.init.freebsd:
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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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jmp systemfive.init.os
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systemfive.init.openbsd:
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pushb systemfive.openbsd-.Lanchorpoint
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push $OPENBSD
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ezlea syscon.openbsd,si
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jmp systemfive.init.os
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systemfive.init.xnu:
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pushb systemfive.xnu-.Lanchorpoint
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push $XNU
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ezlea syscon.xnu,si
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/ 𝑠𝑙𝑖𝑑𝑒
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systemfive.init.os:
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ezlea .Lanchorpoint,cx
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pop %rax
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stosq #→ hostos
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pop %rax
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add %rcx,%rax
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stosq #→ systemfive
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push %rdi
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ezlea syscon.start,di
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ezlea syscon.end,bx
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call systemfive.sleb128unpacker
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pop %rdi
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/ 𝑠𝑙𝑖𝑑𝑒
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systemfive.init.done:
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pop %rsi
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pop %rbx
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.init.end 300,_init_systemfive,globl,hidden
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.text.startup
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systemfive.sleb128unpacker:
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.leafprologue
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or $-1,%r9
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2: cmp %rbx,%rdi
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jnb 5f
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xor %ecx,%ecx
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xor %edx,%edx
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3: lodsb
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mov %rax,%r8
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and $127,%r8d
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sal %cl,%r8
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add $7,%ecx
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or %r8,%rdx
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test %al,%al
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js 3b
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test $64,%al
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je 4f
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mov %r9,%rax
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sal %cl,%rax
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or %rax,%rdx
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4: mov %rdx,%rax
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cmpq $0,(%rdi) # don't change consts already set
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cmovne (%rdi),%rax # @see WinMain() for example
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stosq
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jmp 2b
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5: .leafepilogue
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.previous
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/ Sections for varint encoded numbers.
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/
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/ These sections are all ordered by (group_name, constant_name).
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/ They're populated by modules simply referencing the symbols.
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/
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/ @see libc/sysv/consts.sh
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/ @see libc/sysv/consts/syscon.h
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.section .piro.bss.sort.syscon.1,"aw",@nobits
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.align 8
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syscon.start:/*
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...decentralized quadwords...
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*/.previous
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.section .piro.bss.sort.syscon.3,"aw",@nobits
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syscon.end:
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.previous
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.section .sort.rodata.syscon.linux.1,"a",@progbits
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.align 1
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syscon.linux:/*
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...decentralized leb128...
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*/.previous
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.section .sort.rodata.syscon.xnu.1,"a",@progbits
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.align 1
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syscon.xnu:/*
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...decentralized leb128...
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*/.previous
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.section .sort.rodata.syscon.freebsd.1,"a",@progbits
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.align 1
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syscon.freebsd:/*
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...decentralized leb128...
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*/.previous
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.section .sort.rodata.syscon.openbsd.1,"a",@progbits
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.align 1
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syscon.openbsd:/*
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...decentralized leb128...
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*/.previous
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.section .sort.rodata.syscon.windows.1,"a",@progbits
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.align 1
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syscon.windows:/*
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...decentralized leb128...
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*/.previous
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.type syscon.start,@object
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.type syscon.end,@object
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.type syscon.linux,@object
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.type syscon.xnu,@object
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.type syscon.freebsd,@object
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.type syscon.openbsd,@object
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.type syscon.windows,@object
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.globl syscon.start
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.globl syscon.end
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.globl syscon.linux
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.globl syscon.xnu
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.globl syscon.freebsd
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.globl syscon.openbsd
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.globl syscon.windows
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