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da20df03cd
The modern glibc from 2.34 had two breaking changes: move all api in lib{pthread,dl,rt}.so into libc.so, new static start up code breaking the runtime compatibility for old glibc (<2.34). See https://developers.redhat.com/articles/2021/12/17/why-glibc-234-removed-libpthread for more info.
This commit has 3 changes to overcome these changes:
- override gcc path to redefine glibc symbols on the fly in the generated .o by graalvm when linking
- provide a dynamic startup code to support both old and modern runtime glibc
- add needed dynamic libraries: lib{pthread,rt,dl}.so.
68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/* ref:
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* https://elixir.bootlin.com/glibc/glibc-2.37.9000/source/csu/libc-start.c
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* https://elixir.bootlin.com/glibc/glibc-2.33.9000/source/csu/elf-init.c#L68
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*/
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <stdint.h>
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__asm__(".symver dlsym,dlsym@GLIBC_2.2.5");
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__asm__(".symver dlvsym,dlvsym@GLIBC_2.2.5");
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/* These magic symbols are provided by the linker. */
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extern void (*__init_array_start[])(int, char **, char **) __attribute__ ((visibility ("hidden")));
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extern void (*__init_array_end[])(int, char **, char **) __attribute__ ((visibility ("hidden")));
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extern void _init(void);
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/* These functions are passed to __libc_start_main by the startup code.
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These get statically linked into each program. */
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static void
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__libc_csu_init(const int argc, char **const argv, char **const envp)
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{
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_init();
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const __auto_type size = __init_array_end - __init_array_start;
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for (__auto_type i = 0; i < size; ++i)
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(*__init_array_start[i])(argc, argv, envp);
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}
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int
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__dynamic_libc_start_main(int (*const main)(int, char **, char **),
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const int argc,
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char ** const argv,
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__typeof(&__libc_csu_init) init,
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void (*const fini)(void),
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void (*const rtld_fini)(void),
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void (*const stack_end))
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{
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_Static_assert(sizeof(uintptr_t) >= sizeof(void*), "uintptr_t should contain a object pointer");
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_Static_assert(sizeof(uintptr_t) <= sizeof(&__dynamic_libc_start_main), "function pointer should contain an uintptr_t");
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const __auto_type __libc_start_main = (__typeof(&__dynamic_libc_start_main))(uintptr_t)dlsym(RTLD_DEFAULT, "__libc_start_main");
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if (!dlvsym(RTLD_DEFAULT, "__libc_start_main", "GLIBC_2.34")) {
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init = &__libc_csu_init; // old runtime glibc, ver < 2.34
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}
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return __libc_start_main(main, argc, argv, init, fini, rtld_fini, stack_end);
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}
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