Merge tag 'edgar/xilinx-next-2022-09-21.for-upstream' of https://github.com/edgarigl...
[qemu.git] / bsd-user / openbsd / target_os_elf.h
1 /*
2 * openbsd ELF definitions
3 *
4 * Copyright (c) 2013 Stacey D. Son
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19 #ifndef _TARGET_OS_ELF_H_
20 #define _TARGET_OS_ELF_H_
21
22 #include "target_arch_elf.h"
23 #include "elf.h"
24
25 /* this flag is uneffective under linux too, should be deleted */
26 #ifndef MAP_DENYWRITE
27 #define MAP_DENYWRITE 0
28 #endif
29
30 /* should probably go in elf.h */
31 #ifndef ELIBBAD
32 #define ELIBBAD 80
33 #endif
34
35 #ifndef ELF_PLATFORM
36 #define ELF_PLATFORM (NULL)
37 #endif
38
39 #ifndef ELF_HWCAP
40 #define ELF_HWCAP 0
41 #endif
42
43 #ifdef TARGET_ABI32
44 #undef ELF_CLASS
45 #define ELF_CLASS ELFCLASS32
46 #undef bswaptls
47 #define bswaptls(ptr) bswap32s(ptr)
48 #endif
49
50 /* max code+data+bss space allocated to elf interpreter */
51 #define INTERP_MAP_SIZE (32 * 1024 * 1024)
52
53 /* max code+data+bss+brk space allocated to ET_DYN executables */
54 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
55
56 /* Necessary parameters */
57 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
58 #define TARGET_ELF_PAGESTART(_v) ((_v) & \
59 ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1))
60 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1))
61
62 #define DLINFO_ITEMS 12
63
64 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
65 abi_ulong stringp,
66 struct elfhdr *exec,
67 abi_ulong load_addr,
68 abi_ulong load_bias,
69 abi_ulong interp_load_addr,
70 struct image_info *info)
71 {
72 abi_ulong sp;
73 int size;
74 abi_ulong u_platform;
75 const char *k_platform;
76 const int n = sizeof(elf_addr_t);
77
78 sp = p;
79 u_platform = 0;
80 k_platform = ELF_PLATFORM;
81 if (k_platform) {
82 size_t len = strlen(k_platform) + 1;
83 sp -= (len + n - 1) & ~(n - 1);
84 u_platform = sp;
85 /* FIXME - check return value of memcpy_to_target() for failure */
86 memcpy_to_target(sp, k_platform, len);
87 }
88 /*
89 * Force 16 byte _final_ alignment here for generality.
90 */
91 sp = sp & ~(abi_ulong)15;
92 size = (DLINFO_ITEMS + 1) * 2;
93 if (k_platform) {
94 size += 2;
95 }
96 #ifdef DLINFO_ARCH_ITEMS
97 size += DLINFO_ARCH_ITEMS * 2;
98 #endif
99 size += envc + argc + 2;
100 size += 1; /* argc itself */
101 size *= n;
102 if (size & 15) {
103 sp -= 16 - (size & 15);
104 }
105
106 /*
107 * OpenBSD defines elf_addr_t as Elf32_Off / Elf64_Off
108 */
109 #define NEW_AUX_ENT(id, val) do { \
110 sp -= n; put_user_ual(val, sp); \
111 sp -= n; put_user_ual(id, sp); \
112 } while (0)
113
114 NEW_AUX_ENT(AT_NULL, 0);
115
116 /* There must be exactly DLINFO_ITEMS entries here. */
117 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
118 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr)));
119 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
120 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
121 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
122 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
123 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
124 NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
125 NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
126 NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());
127 NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid());
128 NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP);
129 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK));
130 if (k_platform) {
131 NEW_AUX_ENT(AT_PLATFORM, u_platform);
132 }
133 #ifdef ARCH_DLINFO
134 /*
135 * ARCH_DLINFO must come last so platform specific code can enforce
136 * special alignment requirements on the AUXV if necessary (eg. PPC).
137 */
138 ARCH_DLINFO;
139 #endif
140 #undef NEW_AUX_ENT
141
142 sp = loader_build_argptr(envc, argc, sp, stringp);
143 return sp;
144 }
145
146 #endif /* _TARGET_OS_ELF_H_ */