mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 06:53:33 +00:00
42a3bb729a
It's now possible to use execve() when the parent process isn't built by cosmo. In such cases, the current process will kill all threads and then linger around, waiting for the newly created process to die, and then we propagate its exit code to the parent. This should help bazel and others Allocating private anonymous memory is now 5x faster on Windows. This is thanks to VirtualAlloc() which is faster than the file mapping APIs. The fork() function also now goes 30% faster, since we are able to avoid the VirtualProtect() calls on mappings in most cases now. Fixes #1253
83 lines
4.4 KiB
C
83 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/weaken.h"
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#include "libc/macros.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 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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void *addr = 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 = 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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// TODO(tkchia): LIBC_CALLS doesn't depend on LIBC_VGA so references
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// to its functions need to be weak
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// KINFOF("%s @ %p,+%#zx", APE_COM_NAME, copied_base, size);
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}
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}
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#endif /* __x86_64__ */
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