87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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init/init.c
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Initializes the standard library.
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*******************************************************************************/
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#include <elf.h>
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#include <malloc.h>
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#include <pthread.h>
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#include <string.h>
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char* program_invocation_name;
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char* program_invocation_short_name;
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static char* find_last_elem(char* str)
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{
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size_t len = strlen(str);
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for ( size_t i = len; i; i-- )
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if ( str[i-1] == '/' )
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return str + i;
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return str;
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}
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// Emit an ELF note containing the size and alignment of struct pthread.
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__attribute__((used))
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static void elf_note_sortix_pthread_size(void)
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{
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asm volatile (
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".pushsection .note.sortix,\"a\",@note\n\t"
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".align 4\n\t"
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".long 2f-1f\n\t" // namesz
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".long 4f-3f\n\t" // descsz
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".long %c0\n" // type
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"1:\n\t"
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".string \"Sortix\"\n" // name
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"2:\n\t"
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".align 4\n"
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"3:\n\t"
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#if defined(__x86_64__)
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".quad %c1\n"
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".quad %c2\n"
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#elif defined(__i386__)
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".long %c1\n"
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".long %c2\n"
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#endif
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"4:\n\t"
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".align 4\n\t"
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".popsection\n\t"
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:: "n"(ELF_NOTE_SORTIX_UTHREAD_SIZE),
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"n"(sizeof(struct pthread)),
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"n"(alignof(struct pthread))
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);
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}
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void initialize_standard_library(int argc, char* argv[])
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{
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const char* argv0 = argc ? argv[0] : "";
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program_invocation_name = (char*) argv0;
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program_invocation_short_name = find_last_elem((char*) argv0);
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struct pthread* self = pthread_self();
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self->join_lock = (pthread_mutex_t) PTHREAD_NORMAL_MUTEX_INITIALIZER_NP;
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self->join_lock.lock = 1 /* LOCKED_VALUE */;
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self->join_lock.type = PTHREAD_MUTEX_NORMAL;
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self->join_lock.owner = (unsigned long) self;
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self->detach_lock = (pthread_mutex_t) PTHREAD_NORMAL_MUTEX_INITIALIZER_NP;
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self->detach_state = PTHREAD_CREATE_JOINABLE;
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}
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