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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_ */ |