mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
e75ffde09e
You can now build Cosmopolitan with Clang:
make -j8 MODE=llvm
o/llvm/examples/hello.com
The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
43 lines
2.6 KiB
ArmAsm
43 lines
2.6 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 2020 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.h"
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.source __FILE__
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// Performs raw System Five system call.
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//
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// This function provides a direct path into system call support
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// that's friendly to C code, since it doesn't need an intermediate
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// thunk. It only supports arities up to six, since there's no way
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// to do more safely; this isn't a problem with Linux, although
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// certain BSD calls may not be available.
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//
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// @param %rdi is system call ordinal, which isn't translated,
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// and must be correct for the underlying host system
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// @param %rsi,%rdx,%rcx,%r8,%r9 may supply parameters 1 through 5
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// @param sixth is optionally pushed on the stack before call
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// @return %rax has result, or -1 w/ errno on failure
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syscall:mov %rdi,%rax
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mov %rsi,%rdi
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mov %rdx,%rsi
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mov %rcx,%rdx
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mov %r8,%rcx # ← intended
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mov %r9,%r8
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mov 8(%rsp),%r9
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jmp *__systemfive(%rip)
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.endfn syscall,globl
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