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LibC: Run constructors on process startup.

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Cooperate with the compiler to generate and execute the _init_array list
of constructor functions on userspace program statup. This took two days
to get working, my goodness. :^)
This commit is contained in:
Andreas Kling 2019-03-27 12:48:21 +01:00
parent f1a2cb0882
commit 23bb276fcd
22 changed files with 101 additions and 61 deletions
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28
LibC/crt0.cpp
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@ -10,17 +10,31 @@ int errno;
char** environ;
//bool __environ_is_malloced;
void __malloc_init();
void __stdio_init();
void __libc_init()
{
void __malloc_init();
__malloc_init();
void __stdio_init();
__stdio_init();
}
int _start(int argc, char** argv, char** env)
{
errno = 0;
environ = env;
//__environ_is_malloced = false;
__stdio_init();
__malloc_init();
__libc_init();
extern void _init();
_init();
extern void (*__init_array_start[])(int, char**, char**) __attribute__((visibility("hidden")));
extern void (*__init_array_end[])(int, char**, char**) __attribute__((visibility("hidden")));
const size_t size = __init_array_end - __init_array_start;
for (size_t i = 0; i < size; i++)
(*__init_array_start[i])(argc, argv, env);
int status = main(argc, argv);
@ -37,4 +51,8 @@ int _start(int argc, char** argv, char** env)
assert(false);
}
void __cxa_atexit()
{
}
}