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17030342 | 1 | /*- |
984263bc MD |
2 | * Copyright 1996-1998 John D. Polstra. |
3 | * All rights reserved. | |
984263bc MD |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
984263bc MD |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 | */ | |
25 | ||
26 | #ifndef __GNUC__ | |
27 | #error "GCC is needed to compile this file" | |
28 | #endif | |
29 | ||
9189eb5e | 30 | #include <sys/cdefs.h> |
f54055f1 | 31 | #include <machine/tls.h> |
9189eb5e | 32 | #include <elf.h> |
984263bc | 33 | #include <stdlib.h> |
984263bc | 34 | |
17030342 | 35 | #include "libc_private.h" |
79dc5732 | 36 | #include "initfini.c" |
17030342 | 37 | #include "crtbrand.c" |
984263bc | 38 | |
17030342 | 39 | typedef void (*fptr)(void); |
984263bc | 40 | |
984263bc MD |
41 | #ifdef GCRT |
42 | extern void _mcleanup(void); | |
43 | extern void monstartup(void *, void *); | |
44 | extern int eprol; | |
45 | extern int etext; | |
46 | #endif | |
47 | ||
9189eb5e | 48 | /* static ifunc reloc support */ |
49 | extern const Elf_Rela __rela_iplt_start[] __dso_hidden __weak_symbol; | |
50 | extern const Elf_Rela __rela_iplt_end[] __dso_hidden __weak_symbol; | |
51 | static void fix_iplta(void) __noinline; | |
52 | ||
53 | static void | |
54 | fix_iplta(void) | |
55 | { | |
56 | const Elf_Rela *rela, *relalim; | |
57 | Elf_Addr *where, target, *ptr; | |
58 | ||
59 | rela = __rela_iplt_start; | |
60 | relalim = __rela_iplt_end; | |
61 | for (; rela < relalim; ++rela) { | |
62 | if (ELF_R_TYPE(rela->r_info) != R_X86_64_IRELATIVE) | |
63 | abort(); | |
64 | ptr = (Elf_Addr *)rela->r_addend; | |
65 | where = (Elf_Addr *)rela->r_offset; | |
66 | target = ((Elf_Addr (*)(void))ptr)(); | |
67 | *where = target; | |
68 | } | |
69 | } | |
70 | ||
79dc5732 | 71 | void _start(char **, void (*)(void)); |
984263bc MD |
72 | |
73 | /* The entry function. */ | |
74 | void | |
17030342 | 75 | _start(char **ap, void (*cleanup)(void)) |
984263bc MD |
76 | { |
77 | int argc; | |
78 | char **argv; | |
79 | char **env; | |
80 | ||
17030342 | 81 | argc = *(long *)(void *)ap; |
984263bc | 82 | argv = ap + 1; |
17030342 | 83 | env = ap + 2 + argc; |
a834075a | 84 | handle_argv(argc, argv, env); |
984263bc | 85 | |
e6a7a861 MD |
86 | /* |
87 | * Setup the initial TLS space. The RTLD does not set up our TLS | |
88 | * (it can't, it doesn't know how our errno is declared). It simply | |
89 | * does all the groundwork required so that we can call | |
90 | * _rtld_allocate_tls(). | |
91 | */ | |
92 | _init_tls(); | |
93 | _rtld_call_init(); | |
94 | ||
984263bc MD |
95 | if (&_DYNAMIC != NULL) |
96 | atexit(cleanup); | |
9189eb5e | 97 | else |
98 | fix_iplta(); | |
984263bc MD |
99 | |
100 | #ifdef GCRT | |
101 | atexit(_mcleanup); | |
984263bc MD |
102 | monstartup(&eprol, &etext); |
103 | #endif | |
e2d7e866 JM |
104 | |
105 | handle_static_init(argc, argv, env); | |
98b5f2ce JM |
106 | #ifdef GCRT |
107 | /* | |
108 | * This label was previously located just after the monstartup | |
109 | * function. It was relocated after the handle_static_init function | |
110 | * to avoid an alternative conditional optimization performed by | |
111 | * clang. The optimization cause the compilation to fail with a | |
112 | * label redefinition error. The impact of the label relocation is | |
113 | * the loss of profiling of handle_static_init function. | |
114 | */ | |
115 | __asm__("eprol:"); | |
116 | #endif | |
79dc5732 | 117 | exit(main(argc, argv, env)); |
984263bc | 118 | } |