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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
80 lines
4.2 KiB
C
80 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "ape/relocations.h"
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#include "ape/sections.internal.h"
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#include "libc/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/metalfile.internal.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/pc.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/errfuns.h"
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#ifdef __x86_64__
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#define MAP_ANONYMOUS_linux 0x00000020
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#define MAP_FIXED_linux 0x00000010
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#define MAP_SHARED_linux 0x00000001
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__static_yoink("_init_metalfile");
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void *__ape_com_base;
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size_t __ape_com_size = 0;
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textstartup dontasan void InitializeMetalFile(void) {
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if (IsMetal()) {
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/*
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* Copy out a pristine image of the program — before the program might
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* decide to modify its own .data section.
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*
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* This code is included if a symbol "file:/proc/self/exe" is defined
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* (see libc/calls/metalfile.internal.h & libc/calls/metalfile_init.S).
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* The zipos code will automatically arrange to do this. Alternatively,
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* user code can __static_yoink this symbol.
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*/
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size_t size = ROUNDUP(_ezip - __executable_start, 4096);
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// TODO(jart): Restore support for ZIPOS on metal.
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void *copied_base;
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struct DirectMap dm;
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dm = sys_mmap_metal(NULL, size, PROT_READ | PROT_WRITE,
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MAP_SHARED_linux | MAP_ANONYMOUS_linux, -1, 0);
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copied_base = dm.addr;
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npassert(copied_base != (void *)-1);
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memcpy(copied_base, (void *)(BANE + IMAGE_BASE_PHYSICAL), size);
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__ape_com_base = copied_base;
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__ape_com_size = size;
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}
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}
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#endif /* __x86_64__ */
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