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65 lines
2.8 KiB
ArmAsm
65 lines
2.8 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 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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.privileged
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// Invokes SYSCALL for libfatal forceinline asm() routines.
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//
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// @param rax is ordinal
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// @param rdi is arg1
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// @param rsi is arg2
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// @param rdx is arg3
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// @param rcx is arg4
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// @param r8 is arg5
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// @param r9 is arg6
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// @param rsp may contain more args
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// @return rdx:rax where rax holds -errno on error
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// @clob rax,rdx,memory,cc
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__syscall__:
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mov %rcx,.Lrcx(%rip)
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mov %rdi,.Lrdi(%rip)
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mov %rsi,.Lrsi(%rip)
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mov %r8,.Lr8(%rip)
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mov %r9,.Lr9(%rip)
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mov %r10,.Lr10(%rip)
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mov %r11,.Lr11(%rip)
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mov %rcx,%r10
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clc
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syscall
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jnc 1f
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neg %rax
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1: mov .Lrcx(%rip),%rcx
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mov .Lrdi(%rip),%rdi
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mov .Lrsi(%rip),%rsi
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mov .Lr8(%rip),%r8
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mov .Lr9(%rip),%r9
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mov .Lr10(%rip),%r10
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mov .Lr11(%rip),%r11
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ret
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.endfn __syscall__,globl,hidden
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.bss
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.balign 8
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.Lrcx: .quad 0 // clobbered by syscall
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.Lrdi: .quad 0 // just in case
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.Lrsi: .quad 0 // just in case
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.Lr8: .quad 0 // freebsd bug?
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.Lr9: .quad 0 // just in case
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.Lr10: .quad 0 // just in case
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.Lr11: .quad 0 // clobbered by syscall
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