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f744d540 CD |
1 | # Copyright 2002 Free Software Foundation, Inc. |
2 | # Written by Mitch Lichtenberg <mpl@broadcom.com> and | |
3 | # Chris Demetriou <cgd@broadcom.com> based on m68kelf.em and mipsecoff.em. | |
4 | # | |
5 | # This file is part of GLD, the Gnu Linker. | |
6 | # | |
7 | # This program is free software; you can redistribute it and/or modify | |
8 | # it under the terms of the GNU General Public License as published by | |
9 | # the Free Software Foundation; either version 2 of the License, or | |
10 | # (at your option) any later version. | |
11 | # | |
12 | # This program is distributed in the hope that it will be useful, | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | # GNU General Public License for more details. | |
16 | # | |
17 | # You should have received a copy of the GNU General Public License | |
18 | # along with this program; if not, write to the Free Software | |
19 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | # This shell script emits a C file. -*- C -*- | |
21 | ||
22 | ||
23 | # This file is sourced from elf32.em, and defines some extra routines for m68k | |
24 | # embedded systems using ELF and for some other systems using m68k ELF. While | |
25 | # it is sourced from elf32.em for all m68k ELF configurations, here we include | |
26 | # only the features we want depending on the configuration. | |
27 | ||
28 | case ${target} in | |
29 | mips*-*-elf) | |
30 | echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c | |
31 | ;; | |
32 | esac | |
33 | ||
34 | cat >>e${EMULATION_NAME}.c <<EOF | |
35 | ||
36 | static void mips_elf${ELFSIZE}_after_open PARAMS ((void)); | |
37 | #ifdef SUPPORT_EMBEDDED_RELOCS | |
38 | static void mips_elf${ELFSIZE}_check_sections PARAMS ((bfd *, asection *, | |
39 | PTR)); | |
40 | #endif | |
41 | static void mips_elf${ELFSIZE}_after_allocation PARAMS ((void)); | |
42 | ||
43 | /* This function is run after all the input files have been opened. */ | |
44 | ||
45 | static void | |
46 | mips_elf${ELFSIZE}_after_open() | |
47 | { | |
48 | /* Call the standard elf routine. */ | |
49 | gld${EMULATION_NAME}_after_open (); | |
50 | ||
51 | #ifdef SUPPORT_EMBEDDED_RELOCS | |
52 | if (command_line.embedded_relocs && (! link_info.relocateable)) | |
53 | { | |
54 | bfd *abfd; | |
55 | ||
56 | /* In the embedded relocs mode we create a .rel.sdata section for | |
57 | each input file with a .sdata section which has has | |
58 | relocations. The BFD backend will fill in these sections | |
59 | with magic numbers which can be used to relocate the data | |
60 | section at run time. */ | |
61 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) | |
62 | { | |
63 | asection *datasec; | |
64 | ||
65 | /* As first-order business, make sure that each input BFD is | |
66 | ELF. We need to call a special BFD backend function to | |
67 | generate the embedded relocs, and we have that function | |
68 | only for ELF */ | |
69 | ||
70 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
71 | einfo ("%F%B: all input objects must be ELF for --embedded-relocs\n"); | |
72 | ||
73 | if (bfd_get_arch_size (abfd) != ${ELFSIZE}) | |
74 | einfo ("%F%B: all input objects must be ${ELFSIZE}-bit ELF for --embedded-relocs\n"); | |
75 | ||
76 | datasec = bfd_get_section_by_name (abfd, ".sdata"); | |
77 | ||
78 | /* Note that we assume that the reloc_count field has already | |
79 | been set up. We could call bfd_get_reloc_upper_bound, but | |
80 | that returns the size of a memory buffer rather than a reloc | |
81 | count. We do not want to call bfd_canonicalize_reloc, | |
82 | because although it would always work it would force us to | |
83 | read in the relocs into BFD canonical form, which would waste | |
84 | a significant amount of time and memory. */ | |
85 | ||
86 | if (datasec != NULL && datasec->reloc_count > 0) | |
87 | { | |
88 | asection *relsec; | |
89 | ||
90 | relsec = bfd_make_section (abfd, ".rel.sdata"); | |
91 | if (relsec == NULL | |
92 | || ! bfd_set_section_flags (abfd, relsec, | |
93 | (SEC_ALLOC | |
94 | | SEC_LOAD | |
95 | | SEC_HAS_CONTENTS | |
96 | | SEC_IN_MEMORY)) | |
97 | || ! bfd_set_section_alignment (abfd, relsec, | |
98 | (${ELFSIZE} == 32) ? 2 : 3) | |
99 | || ! bfd_set_section_size (abfd, relsec, | |
100 | datasec->reloc_count | |
101 | * ((${ELFSIZE} / 8) + 8))) | |
102 | einfo ("%F%B: cannot create .rel.sdata section: %E\n"); | |
103 | } | |
104 | ||
105 | /* Double check that all other data sections have no relocs, | |
106 | as is required for embedded PIC code. */ | |
107 | bfd_map_over_sections (abfd, mips_elf${ELFSIZE}_check_sections, | |
108 | (PTR) datasec); | |
109 | } | |
110 | } | |
111 | #endif /* SUPPORT_EMBEDDED_RELOCS */ | |
112 | } | |
113 | ||
114 | #ifdef SUPPORT_EMBEDDED_RELOCS | |
115 | /* Check that of the data sections, only the .sdata section has | |
116 | relocs. This is called via bfd_map_over_sections. */ | |
117 | ||
118 | static void | |
119 | mips_elf${ELFSIZE}_check_sections (abfd, sec, sdatasec) | |
120 | bfd *abfd; | |
121 | asection *sec; | |
122 | PTR sdatasec; | |
123 | { | |
124 | if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0 | |
125 | && sec != (asection *) sdatasec | |
126 | && sec->reloc_count != 0) | |
127 | einfo ("%F%X: section %s has relocs; cannot use --embedded-relocs\n", | |
128 | abfd, bfd_get_section_name (abfd, sec)); | |
129 | } | |
130 | #endif /* SUPPORT_EMBEDDED_RELOCS */ | |
131 | ||
132 | /* This function is called after the section sizes and offsets have | |
133 | been set. If we are generating embedded relocs, it calls a special | |
134 | BFD backend routine to do the work. */ | |
135 | ||
136 | static void | |
137 | mips_elf${ELFSIZE}_after_allocation () | |
138 | { | |
139 | /* Call the standard elf routine. */ | |
140 | after_allocation_default (); | |
141 | ||
142 | #ifdef SUPPORT_EMBEDDED_RELOCS | |
143 | if (command_line.embedded_relocs && (! link_info.relocateable)) | |
144 | { | |
145 | bfd *abfd; | |
146 | ||
147 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) | |
148 | { | |
149 | asection *datasec, *relsec; | |
150 | char *errmsg; | |
151 | ||
152 | datasec = bfd_get_section_by_name (abfd, ".sdata"); | |
153 | ||
154 | if (datasec == NULL || datasec->reloc_count == 0) | |
155 | continue; | |
156 | ||
157 | relsec = bfd_get_section_by_name (abfd, ".rel.sdata"); | |
158 | ASSERT (relsec != NULL); | |
159 | ||
160 | if (! bfd_mips_elf${ELFSIZE}_create_embedded_relocs (abfd, | |
161 | &link_info, | |
162 | datasec, | |
163 | relsec, | |
164 | &errmsg)) | |
165 | { | |
166 | if (errmsg == NULL) | |
167 | einfo ("%B%X: can not create runtime reloc information: %E\n", | |
168 | abfd); | |
169 | else | |
170 | einfo ("%X%B: can not create runtime reloc information: %s\n", | |
171 | abfd, errmsg); | |
172 | } | |
173 | } | |
174 | } | |
175 | #endif /* SUPPORT_EMBEDDED_RELOCS */ | |
176 | } | |
177 | ||
178 | EOF | |
179 | ||
180 | # We have our own after_open and after_allocation functions, but they call | |
181 | # the standard routines, so give them a different name. | |
182 | LDEMUL_AFTER_OPEN=mips_elf${ELFSIZE}_after_open | |
183 | LDEMUL_AFTER_ALLOCATION=mips_elf${ELFSIZE}_after_allocation |