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Mint APE Loader v1.3

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This version has better error messages and safety checks. It supports
loading static position-independent executables. It correctly handles
more kinds of weird ELF program header layouts. A force flag has been
added to avoid system execve(). Finally the longstanding misalignment
with our ELF PT_NOTE section has been addressed.
This commit is contained in:
Justine Tunney 2023-07-23 17:07:38 -07:00
parent 82b1e61443
commit 3d172c99fe
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GPG key ID: BE714B4575D6E328
19 changed files with 1001 additions and 470 deletions
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ape/launch.S Normal file
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
// Calls _start() function of loaded program.
//
// When the program entrypoint is called, all registers shall be
// cleared, with the exception of (1) %rdi will be equal to %rsp
// on FreeBSD and (2) %cl will contain the detected host OS code
//
// We clear all the general registers we can to have some wiggle
// room, to extend the behavior of this loader in the future. We
// don't need to clear the XMM registers because your APE loader
// should be compiled using gcc/clang's -mgeneral-regs-only flag
//
// @param rdi is passed through as-is
// @param rsi is address of entrypoint (becomes zero)
// @param rdx is stack pointer (becomes zero)
// @param rcx is passed through as-is
// @noreturn
Launch: xor %r8d,%r8d
xor %r9d,%r9d
xor %r10d,%r10d
xor %r11d,%r11d
xor %r12d,%r12d
xor %r13d,%r13d
xor %r14d,%r14d
xor %r15d,%r15d
mov %rdx,%rsp
xor %edx,%edx
push %rsi
xor %esi,%esi
xor %ebp,%ebp
xor %ebx,%ebx
xor %eax,%eax
ret
.endfn Launch,globl