Blame arch/nt32/src/crt_glue.c

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#include <unistd.h>
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#include <pthread.h>
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#include "atomic.h"
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#include "syscall.h"
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#include "psxglue.h"
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#include "pthread_impl.h"
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extern const struct __ldso_vtbl * __ldso_vtbl;
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extern const struct __psx_vtbl *  __psx_vtbl;
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typedef int __app_main();
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typedef int __pthread_surrogate_routine(struct pthread *);
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static int __pthread_surrogate_init(struct pthread * self);
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extern int __libc_start_main(
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	void *	main,
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	int	argc,
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	char **	argv);
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static void (*__global_ctors_fn)();
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static void (*__global_dtors_fn)();
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void _init()
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{
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	__global_ctors_fn();
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}
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void _fini()
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{
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	__global_dtors_fn();
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}
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struct __tls {
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	void *		pad[16/sizeof(void *)];
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	struct pthread	pt;
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} __builtin_tls = {{0}};
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void __init_tls (size_t * auxv)
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{
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	#define T __builtin_tls
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	__set_thread_area(&T.pt);
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	T.pt.self	= &T.pt;
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	T.pt.locale	= &libc.global_locale;
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	T.pt.tid	= __syscall(SYS_set_tid_address, &T.pt.tid);
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	libc.can_do_threads = 1;
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	libc.tls_size = sizeof(struct __tls);
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};
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void __libc_entry_routine(
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	__app_main *		__main,
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	__psx_init_routine *	__psx_init,
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	int			options)
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{
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	int			argc;
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	char **			argv;
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	char **			envp;
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	struct __psx_context	ctx;
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	/* ctx init */
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	ctx.size		= sizeof(ctx);
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	ctx.options		= options;
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	ctx.pthread_create_fn	= pthread_create;
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	ctx.pthread_surrogate_fn= __pthread_surrogate_init;
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	/* __psx_init must succeed... */
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	if (__psx_init(&argc,&argv,&envp,&ctx))
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		a_crash();
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	/* ...and conform */
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	else if (envp != argv + (argc + 1))
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		a_crash();
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	/* write once */
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	__syscall_vtbl	= (unsigned long **)ctx.sys_vtbl;
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	__ldso_vtbl	= ctx.ldso_vtbl;
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	__psx_vtbl	= ctx.psx_vtbl;
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	__teb_sys_idx	= ctx.teb_sys_idx;
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	__teb_libc_idx	= ctx.teb_libc_idx;
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	/* surrogate init/fini arrays */
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	__global_ctors_fn = ctx.do_global_ctors_fn;
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	__global_dtors_fn = ctx.do_global_dtors_fn;
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	/* enter libc */
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	__psx_vtbl->start_main(__main,argc,argv,__libc_start_main);
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	/* guard */
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	a_crash();
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}
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static int __pthread_surrogate_init(struct pthread * self)
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{
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	/**
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	 * invoked by psxscl upon creation of a surrogate libc
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	 * thread, which in turn may only call pthread_create();
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	 *
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	 * the purpose of this mecahnism is to support a scenario
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	 * where a third-party library creates a non-posix thread
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	 * which then calls, be it directly or via a callback
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	 * function, a libc api that depends on a valid
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	 * pthread_self.
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	 *
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	 * self: a pointer to an already zero'ed memory page
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	 *
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	 * struct pthread relevant members:
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	 * --------------------------------
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	 * cancel (already zero)
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	 * canary (already zero)
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	 *
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	 * pthread_create() reference:
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	 * 1a47ed15eebf96d0c8d5de4aea54108bc8cc3f53
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	**/
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	return 0;
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}