mirror of
https://github.com/RGBCube/serenity
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824bbc7462
Implement __cxa_atexit and __cxa_finalize per the Itanium spec, and convert stdlib's atexit and exit() to to call them instead of a custom 'C-only' atexit implementation.
104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
#include <AK/Types.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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extern "C" {
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int main(int, char**, char**);
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__thread int errno;
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char** environ;
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bool __environ_is_malloced;
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void __libc_init()
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{
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void __malloc_init();
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__malloc_init();
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void __stdio_init();
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__stdio_init();
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}
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int _start(int argc, char** argv, char** env)
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{
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environ = env;
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__environ_is_malloced = false;
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__libc_init();
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extern void _init();
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_init();
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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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const size_t size = __init_array_end - __init_array_start;
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for (size_t i = 0; i < size; i++)
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(*__init_array_start[i])(argc, argv, env);
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int status = main(argc, argv, environ);
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exit(status);
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return 20150614;
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}
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[[noreturn]] void __cxa_pure_virtual()
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{
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ASSERT_NOT_REACHED();
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}
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typedef void (*AtExitFunction)(void *);
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struct __exit_entry
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{
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AtExitFunction method;
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void* parameter;
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void* dso_handle;
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bool has_been_called;
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};
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static __exit_entry __exit_entries[1024]{};
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static int __exit_entry_count = 0;
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int __cxa_atexit(AtExitFunction exit_function, void *parameter, void *dso_handle)
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{
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if (__exit_entry_count >= 1024)
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return -1;
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__exit_entries[__exit_entry_count++] = { exit_function, parameter, dso_handle, false};
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return 0;
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}
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void __cxa_finalize(void* dso_handle)
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{
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// From the itanium abi, https://itanium-cxx-abi.github.io/cxx-abi/abi.html#dso-dtor-runtime-api
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//
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// When __cxa_finalize(d) is called, it should walk the termination function list, calling each in turn
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// if d matches __dso_handle for the termination function entry. If d == NULL, it should call all of them.
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// Multiple calls to __cxa_finalize shall not result in calling termination function entries multiple times;
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// the implementation may either remove entries or mark them finished.
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int entry_index = __exit_entry_count;
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while (--entry_index >= 0)
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{
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auto& exit_entry = __exit_entries[entry_index];
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bool needs_calling = !exit_entry.has_been_called && (!dso_handle || dso_handle == exit_entry.dso_handle);
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if (needs_calling) {
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exit_entry.method(exit_entry.parameter);
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exit_entry.has_been_called = true;
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}
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}
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}
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extern u32 __stack_chk_guard;
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u32 __stack_chk_guard = (u32)0xc0000c13;
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[[noreturn]] void __stack_chk_fail()
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{
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ASSERT_NOT_REACHED();
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}
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}
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