1/* Copyright (C) 1998-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stdlib.h>
19#include <unistd.h>
20#include <ldsodefs.h>
21#include <sysdep.h>
22
23#ifndef SHARED
24#include <hwcapinfo.h>
25#endif
26#if ENABLE_STATIC_PIE && !defined SHARED
27/* For elf_machine_load_address. */
28#include <dl-machine.h>
29#endif
30
31/* The main work is done in the generic function. */
32#define LIBC_START_MAIN generic_start_main
33#define LIBC_START_DISABLE_INLINE
34#define LIBC_START_MAIN_AUXVEC_ARG
35#define MAIN_AUXVEC_ARG
36#define INIT_MAIN_ARGS
37#include <csu/libc-start.c>
38
39struct startup_info
40 {
41 void *sda_base;
42 int (*main) (int, char **, char **, void *);
43 int (*init) (int, char **, char **, void *);
44 void (*fini) (void);
45 };
46
47int
48__libc_start_main_impl (int argc, char **argv,
49 char **ev,
50 ElfW (auxv_t) * auxvec,
51 void (*rtld_fini) (void),
52 struct startup_info *stinfo,
53 char **stack_on_entry)
54{
55 /* the PPC SVR4 ABI says that the top thing on the stack will
56 be a NULL pointer, so if not we assume that we're being called
57 as a statically-linked program by Linux... */
58 if (*stack_on_entry != NULL)
59 {
60 char **temp;
61 /* ...in which case, we have argc as the top thing on the
62 stack, followed by argv (NULL-terminated), envp (likewise),
63 and the auxiliary vector. */
64 /* 32/64-bit agnostic load from stack */
65 argc = *(long int *) stack_on_entry;
66 argv = stack_on_entry + 1;
67 ev = argv + argc + 1;
68#ifdef HAVE_AUX_VECTOR
69 temp = ev;
70 while (*temp != NULL)
71 ++temp;
72 auxvec = (ElfW (auxv_t) *)++ temp;
73#endif
74 rtld_fini = NULL;
75 }
76
77 for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
78 switch (av->a_type)
79 {
80 /* For the static case, we also need _dl_hwcap, _dl_hwcap2 and
81 _dl_platform, so we can call
82 __tcb_parse_hwcap_and_convert_at_platform (). */
83#ifndef SHARED
84 case AT_HWCAP:
85 _dl_hwcap = (unsigned long int) av->a_un.a_val;
86 break;
87 case AT_HWCAP2:
88 _dl_hwcap2 = (unsigned long int) av->a_un.a_val;
89 break;
90 case AT_HWCAP3:
91 _dl_hwcap3 = (unsigned long int) av->a_un.a_val;
92 break;
93 case AT_HWCAP4:
94 _dl_hwcap4 = (unsigned long int) av->a_un.a_val;
95 break;
96 case AT_PLATFORM:
97 _dl_platform = (void *) av->a_un.a_val;
98 break;
99#endif
100 }
101
102 /* Initialize hwcap/hwcap2 and platform data so it can be copied to
103 the TCB later in __libc_setup_tls (). (static case only). */
104#ifndef SHARED
105 __tcb_parse_hwcap_and_convert_at_platform ();
106#endif
107
108 void *stmain = stinfo->main;
109#if ENABLE_STATIC_PIE && !defined SHARED
110 struct link_map *map = _dl_get_dl_main_map ();
111 if (!map->l_relocated)
112 stmain = (char *) stmain + elf_machine_load_address ();
113#endif
114
115 return generic_start_main (main: stmain, argc, argv, auxvec,
116 NULL, NULL, rtld_fini,
117 stack_end: stack_on_entry);
118}
119DEFINE_LIBC_START_MAIN_VERSION
120

source code of glibc/sysdeps/unix/sysv/linux/powerpc/libc-start.c