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Work towards zipos / open(argv[0]) on metal (#667)

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tkchia 2022-11-06 15:29:47 +08:00 • committed by GitHub
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17 changed files with 257 additions and 46 deletions
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ This is free and unencumbered software released into the public domain. │
│ │
│ Anyone is free to copy, modify, publish, use, compile, sell, or │
│ distribute this software, either in source code form or as a compiled │
│ binary, for any purpose, commercial or non-commercial, and by any │
│ means. │
│ │
│ In jurisdictions that recognize copyright laws, the author or authors │
│ of this software dedicate any and all copyright interest in the │
│ software to the public domain. We make this dedication for the benefit │
│ of the public at large and to the detriment of our heirs and │
│ successors. We intend this dedication to be an overt act of │
│ relinquishment in perpetuity of all present and future rights to this │
│ software under copyright law. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
│ OTHER DEALINGS IN THE SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/relocations.h"
#include "ape/sections.internal.h"
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/metalfile.internal.h"
#include "libc/intrin/directmap.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/macros.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/pc.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/errfuns.h"
#define MAP_ANONYMOUS_linux 0x00000020
#define MAP_FIXED_linux 0x00000010
#define MAP_SHARED_linux 0x00000001
STATIC_YOINK("_init_metalfile");
void *__ape_com_base;
size_t __ape_com_size = 0;
textstartup void InitializeMetalFile(void) {
if (IsMetal()) {
/*
* Copy out a pristine image of the program — before the program might
* decide to modify its own .data section.
*
* This code is included if a symbol "file:/proc/self/exe" is defined
* (see libc/calls/metalfile.internal.h & libc/calls/metalfile_init.S).
* The zipos code will automatically arrange to do this. Alternatively,
* user code can STATIC_YOINK this symbol.
*/
size_t size = ROUNDUP(_tdata_end - _base, 4096);
void *copied_base;
struct DirectMap dm;
dm = sys_mmap_metal(NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED_linux | MAP_ANONYMOUS_linux, -1, 0);
copied_base = dm.addr;
_npassert(copied_base != (void *)-1);
memcpy(copied_base, (void *)(BANE + IMAGE_BASE_REAL), size);
__ape_com_base = copied_base;
__ape_com_size = size;
}
}