| 1 | /*
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| 2 | * Copyright (c) 2018 CZ.NIC, z.s.p.o.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include "../private/libc.h"
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| 30 |
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| 31 | /*
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| 32 | * We shouldn't be accessing these symbols directly from libc,
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| 33 | * since it would create unwanted relocations in shared library
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| 34 | * code. Instead, we refer to them here, in a file that's always
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| 35 | * statically linked to the main executable, and write their values
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| 36 | * to a special structure that resides in libc.
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| 37 | */
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| 38 |
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| 39 | extern init_array_entry_t __preinit_array_start[] __attribute__((weak));
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| 40 | extern init_array_entry_t __preinit_array_end[] __attribute__((weak));
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| 41 | extern init_array_entry_t __init_array_start[] __attribute__((weak));
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| 42 | extern init_array_entry_t __init_array_end[] __attribute__((weak));
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| 43 | extern fini_array_entry_t __fini_array_start[] __attribute__((weak));
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| 44 | extern fini_array_entry_t __fini_array_end[] __attribute__((weak));
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| 45 | extern int main(int, char *[]);
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| 46 | extern unsigned char __executable_start[];
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| 47 | extern unsigned char _end[];
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| 48 |
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| 49 | /* __c_start is only called from _start in assembly. */
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| 50 | void __c_start(void *);
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| 51 |
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| 52 | void __c_start(void *pcb)
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| 53 | {
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| 54 | __progsymbols = (progsymbols_t) {
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| 55 | .main = main,
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| 56 | .elfstart = __executable_start,
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| 57 | .end = _end,
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| 58 | .preinit_array = __preinit_array_start,
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| 59 | .preinit_array_len = __preinit_array_end - __preinit_array_start,
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| 60 | .init_array = __init_array_start,
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| 61 | .init_array_len = __init_array_end - __init_array_start,
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| 62 | .fini_array = __fini_array_start,
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| 63 | .fini_array_len = __fini_array_end - __fini_array_start,
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| 64 | };
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| 65 |
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| 66 | __libc_main(pcb);
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| 67 | }
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