mirror of
https://github.com/jart/cosmopolitan.git
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14fe83facd
* Reorder Launch arguments, pass aarch64 os Third and fourth arguments are now identical between cosmo and Launch. By passing sp as argument 4, we save a bit of register juggling. Fourth argument (os) is now always passed by the loader on aarch64. It is not yet processed by cosmo. Pushing this change separately, as the cosmo side turns out to be somewhat more involved. * cosmo2 receives os from loader FreeBSD aarch64 now traps early rather than pretending to be Linux. o/aarch64/examples/env.com still works on Linux and Xnu.
91 lines
3.1 KiB
ArmAsm
91 lines
3.1 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│ vi: set noet ft=asm ts=8 sw=8 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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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// Calls _start() function of loaded program.
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//
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// When the program entrypoint is called, all registers shall be
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// cleared, with the exception of (1) %rdi will be equal to %rsp
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// on FreeBSD and (2) %cl will contain the detected host OS code
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//
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// We clear all the general registers we can to have some wiggle
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// room, to extend the behavior of this loader in the future. We
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// don't need to clear the XMM registers because your APE loader
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// should be compiled using gcc/clang's -mgeneral-regs-only flag
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//
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// @param rdi is passed through as-is
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// @param rsi is address of entrypoint (becomes zero)
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// @param rdx is passed through as-is
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// @param rcx is passed through as-is
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// @param r8 is stack pointer (becomes zero)
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// @noreturn
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Launch:
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#ifdef __aarch64__
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mov x16,x1
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mov sp,x4
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mov x1,0
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mov x4,0
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mov x5,0
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mov x6,0
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mov x7,0
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mov x8,0
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mov x9,0
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mov x10,0
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mov x11,0
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mov x12,0
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mov x13,0
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mov x14,0
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mov x15,0
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mov x17,0
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mov x19,0
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mov x20,0
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mov x21,0
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mov x22,0
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mov x23,0
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mov x24,0
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mov x25,0
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mov x26,0
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mov x27,0
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mov x28,0
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mov x29,0
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mov x30,0
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br x16
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#else
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mov %r8,%rsp
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xor %r8d,%r8d
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xor %r9d,%r9d
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xor %r10d,%r10d
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xor %r11d,%r11d
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xor %r12d,%r12d
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xor %r13d,%r13d
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xor %r14d,%r14d
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xor %r15d,%r15d
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push %rsi
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xor %esi,%esi
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xor %ebp,%ebp
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xor %ebx,%ebx
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xor %eax,%eax
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ret
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#endif
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.endfn Launch,globl
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