1 /* Copyright (C) 2003, 2004 Red Hat, Inc.
2 Contributed by Alexandre Oliva <aoliva@redhat.com>
3 Based on ../i386/dl-sysdep.h
5 This file is part of uClibc.
7 uClibc is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 uClibc is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with uClibc; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
23 * Various assembly language/system dependent hacks that are required
24 * so that we can minimize the amount of platform specific code.
28 * Define this if the system uses RELOCA.
30 #undef ELF_USES_RELOCA
32 /* JMPREL relocs are inside the DT_RELA table. */
33 #define ELF_MACHINE_PLTREL_OVERLAP
35 #define DL_NO_COPY_RELOCS
38 * Initialization sequence for a GOT. Copy the resolver function
39 * descriptor and the pointer to the elf_resolve/link_map data
40 * structure. Initialize the got_value in the module while at that.
42 #define INIT_GOT(GOT_BASE,MODULE) \
44 (MODULE)->loadaddr.got_value = (GOT_BASE); \
45 GOT_BASE[0] = ((unsigned long *)&_dl_linux_resolve)[0]; \
46 GOT_BASE[1] = ((unsigned long *)&_dl_linux_resolve)[1]; \
47 GOT_BASE[2] = (unsigned long) MODULE; \
50 /* Here we define the magic numbers that this dynamic loader should accept */
51 #define MAGIC1 EM_CYGNUS_FRV
54 /* Used for error messages */
55 #define ELF_TARGET "FR-V"
63 } __attribute__((__aligned__(8)));
66 extern int _dl_linux_resolve(void) __attribute__((__visibility__("hidden")));
68 #define do_rem(result, n, base) ((result) = (n) % (base))
70 /* 16KiB page alignment. Should perhaps be made dynamic using
71 getpagesize(), based on AT_PAGESZ from auxvt? */
72 #define PAGE_ALIGN 0xffffc000
73 #define ADDR_ALIGN 0x3fff
74 #define OFFS_ALIGN 0x7fffc000
78 /* We must force strings used early in the bootstrap into the data
79 segment, such that they are referenced with GOTOFF instead of
80 GPREL, because GPREL needs the GOT to have already been
82 #undef SEND_EARLY_STDERR
83 #define SEND_EARLY_STDERR(S) \
84 do { static char __s[] = (S); SEND_STDERR (__s); } while (0)
86 #define DL_LOADADDR_TYPE struct elf32_fdpic_loadaddr
88 #define DL_RELOC_ADDR(ADDR, LOADADDR) \
89 (__reloc_pointer ((void*)(ADDR), (LOADADDR).map))
91 #define DL_ADDR_TO_FUNC_PTR(ADDR, LOADADDR) \
92 ((void(*)(void)) _dl_funcdesc_for ((void*)(ADDR), (LOADADDR).got_value))
94 #define _dl_stabilize_funcdesc(val) \
95 ({ asm ("" : "+m" (*(val))); (val); })
97 #define DL_CALL_FUNC_AT_ADDR(ADDR, LOADADDR, SIGNATURE, ...) \
98 ({ struct funcdesc_value fd = { (void*)(ADDR), (LOADADDR).got_value }; \
99 void (*pf)(void) = (void*) _dl_stabilize_funcdesc (&fd); \
100 (* SIGNATURE pf)(__VA_ARGS__); })
102 #define DL_INIT_LOADADDR_BOOT(LOADADDR, BASEADDR) \
103 (__dl_init_loadaddr_map (&(LOADADDR), dl_boot_got_pointer, \
104 dl_boot_ldsomap ?: dl_boot_progmap))
106 #define DL_INIT_LOADADDR_PROG(LOADADDR, BASEADDR) \
107 (__dl_init_loadaddr_map (&(LOADADDR), 0, dl_boot_progmap))
109 #define DL_INIT_LOADADDR_EXTRA_DECLS \
110 int dl_init_loadaddr_load_count;
111 #define DL_INIT_LOADADDR(LOADADDR, BASEADDR, PHDR, PHDRCNT) \
112 (dl_init_loadaddr_load_count = \
113 __dl_init_loadaddr (&(LOADADDR), (PHDR), (PHDRCNT)))
114 #define DL_INIT_LOADADDR_HDR(LOADADDR, ADDR, PHDR) \
115 (__dl_init_loadaddr_hdr ((LOADADDR), (ADDR), (PHDR), \
116 dl_init_loadaddr_load_count))
117 #define DL_LOADADDR_UNMAP(LOADADDR, LEN) \
118 (__dl_loadaddr_unmap ((LOADADDR), (NULL)))
119 #define DL_LIB_UNMAP(LIB, LEN) \
120 (__dl_loadaddr_unmap ((LIB)->loadaddr, (LIB)->funcdesc_ht))
121 #define DL_LOADADDR_BASE(LOADADDR) \
122 ((LOADADDR).got_value)
124 /* This is called from dladdr(), such that we map a function
125 descriptor's address to the function's entry point before trying to
126 find in which library it's defined. */
127 #define DL_LOOKUP_ADDRESS(ADDRESS) (_dl_lookup_address (ADDRESS))
129 #define DL_ADDR_IN_LOADADDR(ADDR, TPNT, TFROM) \
130 (! (TFROM) && __dl_addr_in_loadaddr ((void*)(ADDR), (TPNT)->loadaddr))
132 /* We only support loading FDPIC independently-relocatable shared
133 libraries. It probably wouldn't be too hard to support loading
134 shared libraries that require relocation by the same amount, but we
135 don't know that they exist or would be useful, and the dynamic
136 loader code could leak the whole-library map unless we keeping a
137 bit more state for DL_LOADADDR_UNMAP and DL_LIB_UNMAP, so let's
138 keep things simple for now. */
139 #define DL_CHECK_LIB_TYPE(epnt, piclib, _dl_progname, libname) \
142 if (((epnt)->e_flags & EF_FRV_FDPIC) && ! ((epnt)->e_flags & EF_FRV_PIC)) \
146 _dl_internal_error_number = LD_ERROR_NOTDYN; \
147 _dl_dprintf(2, "%s: '%s' is not an FDPIC shared library" \
148 "\n", (_dl_progname), (libname)); \
155 /* We want want to apply all relocations in the interpreter during
156 bootstrap. Because of this, we have to skip the interpreter
157 relocations in _dl_parse_relocation_information(), see
159 #define DL_SKIP_BOOTSTRAP_RELOC(SYMTAB, INDEX, STRTAB) 0
162 #define _DL_PREAD(FD, BUF, SIZE, OFFSET) \
163 (_dl_pread((FD), (BUF), (SIZE), (OFFSET)))
166 /* We want to return to dlsym() a function descriptor if the symbol
167 turns out to be a function. */
168 #define DL_FIND_HASH_VALUE(TPNT, TYPE_CLASS, SYM) \
169 (((TYPE_CLASS) & ELF_RTYPE_CLASS_DLSYM) \
170 && ELF32_ST_TYPE((SYM)->st_info) == STT_FUNC \
171 ? _dl_funcdesc_for (DL_RELOC_ADDR ((SYM)->st_value, (TPNT)->loadaddr), \
172 (TPNT)->loadaddr.got_value) \
173 : DL_RELOC_ADDR ((SYM)->st_value, (TPNT)->loadaddr))