1 /* Copyright (C) 2003 Red Hat, Inc.
2 Contributed by Alexandre Oliva <aoliva@redhat.com>
4 This file is part of uClibc.
6 uClibc is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 uClibc is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with uClibc; see the file COPYING.LIB. If not, write to
18 the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
21 /* Any assembly language/system dependent hacks needed to setup
22 * boot1.c so it will work as expected and cope with whatever platform
23 * specific wierdness is needed for this architecture.
26 /* At program start-up, p0 contains a pointer to a
27 elf32_fdpic_loadmap that describes how the executable was loaded
28 into memory. p1 contains a pointer to the interpreter (our!)
29 loadmap, if there is an interpreter, or 0 if we're being run as an
30 executable. p2 holds a pointer to the interpreter's dynamic
31 section, if there is an interpreter, or to the executable's dynamic
32 section, otherwise. If the executable is not dynamic, gr18 is 0.
34 We rely on the fact that the linker adds a pointer to the
35 _GLOBAL_OFFSET_TABLE_ as the last ROFIXUP entry, and that
36 __self_reloc returns the relocated pointer to us, so that we can
37 use this value to initialize the PIC register. */
41 " .global __start\n" \
42 " .type __start,@function\n" \
53 " R1.L = __ROFIXUP_LIST__;\n" \
54 " R1.H = __ROFIXUP_LIST__;\n" \
55 " R2.L = __ROFIXUP_END__;\n" \
56 " R2.H = __ROFIXUP_END__;\n" \
64 " CALL ___self_reloc;\n" \
69 " [SP + 12] = R7;\n" \
72 " [SP + 16] = P0;\n" \
74 " [SP + 20] = P0;\n" \
75 " CALL __dl_start;\n" \
76 " /* Pass our FINI ptr() to the user in P1 */\n" \
77 " R7 = [P5 + __dl_fini@FUNCDESC_GOT17M4];\n" \
78 " P4 = [SP + 24];\n" \
79 " P3 = [SP + 28];\n" \
83 " .size __start,.-__start\n"
88 static void __attribute__ ((used)) \
89 _dl_start (Elf32_Addr dl_boot_got_pointer, \
90 struct elf32_fdpic_loadmap *dl_boot_progmap, \
91 struct elf32_fdpic_loadmap *dl_boot_ldsomap, \
92 Elf32_Dyn *dl_boot_ldso_dyn_pointer, \
93 struct funcdesc_value *dl_main_funcdesc, \
96 struct elf32_fdpic_loadmap;
99 * Get a pointer to the argv array. On many platforms this can be just
100 * the address of the first argument, on other platforms we need to
101 * do something a little more subtle here.
103 #define GET_ARGV(ARGVP, ARGS) ARGVP = (((unsigned long*) ARGS) + 1)
106 * Here is a macro to perform a relocation. This is only used when
107 * bootstrapping the dynamic loader. RELP is the relocation that we
108 * are performing, REL is the pointer to the address we are relocating.
109 * SYMBOL is the symbol involved in the relocation, and LOAD is the
112 #define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
113 switch(ELF32_R_TYPE((RELP)->r_info)){ \
114 case R_BFIN_BYTE4_DATA: \
115 *(REL) += (SYMBOL); \
117 case R_BFIN_FUNCDESC_VALUE: \
119 struct funcdesc_value fv = { \
120 (void*)((SYMBOL) + *(REL)), \
123 *(struct funcdesc_value volatile *)(REL) = fv; \
131 * Transfer control to the user's application, once the dynamic loader
132 * is done. We return the address of the function's entry point to
133 * _dl_boot, see boot1_arch.h.
135 #define START() do { \
136 struct elf_resolve *exec_mod = _dl_loaded_modules; \
137 dl_main_funcdesc->entry_point = _dl_elf_main; \
138 while (exec_mod->libtype != elf_executable) \
139 exec_mod = exec_mod->next; \
140 dl_main_funcdesc->got_value = exec_mod->loadaddr.got_value; \