mirror of
https://github.com/fergalmoran/ladybird.git
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932a722623
Previously, the actual behavior of magic lookup and one described in its commit description have not matched. Instead of being weak definitions in a library that is always in the end of load order, the definitions were normal ones and thus were able to override other weak definitions in LibC. While this was consistent with how DynamicLoader resolves ambiguity between normal and weak relocations, this is not the behavior POSIX mandates -- we should always choose first available definition wrt load order. To fix this problem, the patch makes sure we don't define any of magic symbols in LibC. In addition to this, it makes all provided magic symbols functions (instead of objects), what renders MagicWeakSymbol class unnecessary.
58 lines
1.1 KiB
C++
58 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Types.h>
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#include <assert.h>
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#include <errno.h>
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#include <sys/internals.h>
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#include <unistd.h>
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[[gnu::weak]] char** __environ_value() asm("__environ_value");
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extern "C" {
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#ifdef NO_TLS
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int errno_storage;
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#else
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__thread int errno_storage;
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#endif
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bool __environ_is_malloced = false;
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bool __stdio_is_initialized = false;
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void* __auxiliary_vector = reinterpret_cast<void*>(explode_byte(0xe1));
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#ifndef _DYNAMIC_LOADER
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char** environ = reinterpret_cast<char**>(explode_byte(0xe2));
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uintptr_t __stack_chk_guard;
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#endif
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static void __auxiliary_vector_init();
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int* __errno_location()
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{
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return &errno_storage;
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}
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void __libc_init([[maybe_unused]] uintptr_t cookie)
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{
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#ifndef _DYNAMIC_LOADER
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__stack_chk_guard = cookie;
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environ = __environ_value();
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#endif
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__auxiliary_vector_init();
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__malloc_init();
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__stdio_init();
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}
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static void __auxiliary_vector_init()
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{
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char** env;
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for (env = environ; *env; ++env) {
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}
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__auxiliary_vector = (void*)++env;
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}
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}
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