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[binutils.git] / bfd / aout-cris.c
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1 /* BFD backend for CRIS a.out binaries.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2007
3 Free Software Foundation, Inc.
4 Contributed by Axis Communications AB.
5 Written by Hans-Peter Nilsson.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
24 /* See info in the file PORTING for documentation of these macros and
25 functions. Beware; some of the information there is outdated. */
27 #define N_HEADER_IN_TEXT(x) 0
28 #define N_TXTOFF(x) 32
29 #define ENTRY_CAN_BE_ZERO
30 #define TEXT_START_ADDR 0
32 /* Without reading symbols to get the text start symbol, there is no way
33 to know where the text segment starts in an a.out file. Defaulting to
34 anything as constant as TEXT_START_ADDR is bad. But we can guess from
35 the entry point, which is usually within the first 64k of the text
36 segment. We also assume here that the text segment is 64k-aligned.
37 FIXME: It is also wrong to assume that data and bss follow immediately
38 after text, but with those, we don't have any choice besides reading
39 symbol info, and luckily there's no pressing need for correctness for
40 those vma:s at this time. */
41 #define N_TXTADDR(x) ((x).a_entry & ~(bfd_vma) 0xffff)
43 /* If you change this to 4, you can not link to an address N*4+2. */
44 #define SEGMENT_SIZE 2
46 /* For some reason, if the a.out file has Z_MAGIC, then
47 adata(abfd).exec_bytes_size is not used, but rather
48 adata(abfd).zmagic_disk_block_size, even though the exec_header is
49 *not* included in the text segment. A simple workaround is to
50 #define ZMAGIC_DISK_BLOCK_SIZE, which is used if defined; otherwise
51 TARGET_PAGE_SIZE is used. */
52 #define ZMAGIC_DISK_BLOCK_SIZE N_TXTOFF (0)
54 /* It seems odd at first to set a page-size this low, but gives greater
55 freedom in where things can be linked. The drawback is that you have
56 to set alignment and padding in linker scripts. */
57 #define TARGET_PAGE_SIZE SEGMENT_SIZE
58 #define TARGETNAME "a.out-cris"
60 /* N_SHARED_LIB gets this reasonable default as of 1999-07-12, but we
61 have to work with 2.9.1. Note that N_SHARED_LIB is used in a
62 SUN-specific context, not applicable to CRIS. */
63 #define N_SHARED_LIB(x) 0
65 /* The definition here seems not used; just provided as a convention. */
66 #define DEFAULT_ARCH bfd_arch_cris
68 /* Do not "beautify" the CONCAT* macro args. Traditional C will not
69 remove whitespace added here, and thus will fail to concatenate
70 the tokens. */
71 #define MY(OP) CONCAT2 (cris_aout_,OP)
72 #define NAME(x, y) CONCAT3 (cris_aout,_32_,y)
74 #include "bfd.h"
76 /* Version 1 of the header. */
77 #define MY_exec_hdr_flags 1
79 #define MY_write_object_contents MY (write_object_contents)
80 static bfd_boolean MY (write_object_contents) (bfd *);
82 /* Forward this, so we can use a pointer to it in PARAMS. */
83 struct reloc_ext_external;
85 #define MY_swap_ext_reloc_out MY (swap_ext_reloc_out)
86 static void MY (swap_ext_reloc_out) (bfd *, arelent *, struct reloc_ext_external *);
88 #define MY_swap_ext_reloc_in MY (swap_ext_reloc_in)
89 static void MY (swap_ext_reloc_in) (bfd *, struct reloc_ext_external *,
90 arelent *, asymbol **, bfd_size_type);
92 #define MY_set_sizes MY (set_sizes)
93 static bfd_boolean MY (set_sizes) (bfd *);
95 /* To set back reloc_size to ext, we make MY (set_sizes) be called
96 through this construct. Note that MY_set_arch_mach is only called
97 through SET_ARCH_MACH. The default bfd_default_set_arch_mach will
98 not call set_sizes. */
100 #define MY_set_arch_mach NAME (aout, set_arch_mach)
101 #define SET_ARCH_MACH(BFD, EXEC) \
102 MY_set_arch_mach (BFD, DEFAULT_ARCH, N_MACHTYPE (EXEC))
104 /* These macros describe the binary layout of the reloc information we
105 use in a file. */
106 #define RELOC_EXT_BITS_EXTERN_LITTLE 0x80
107 #define RELOC_EXT_BITS_TYPE_LITTLE 3
108 #define RELOC_EXT_BITS_TYPE_SH_LITTLE 0
110 #ifndef MY_get_section_contents
111 #define MY_get_section_contents aout_32_get_section_contents
112 #endif
114 #define MACHTYPE_OK(mtype) ((mtype) == M_CRIS)
116 /* Include generic functions (some are overridden above). */
117 #include "aout32.c"
118 #include "aout-target.h"
120 /* We need our own version to set header flags. */
122 static bfd_boolean
123 MY (write_object_contents) (bfd *abfd)
125 struct external_exec exec_bytes;
126 struct internal_exec *execp = exec_hdr (abfd);
128 /* We set the reloc type to RELOC_EXT_SIZE, although setting it at all
129 seems unnecessary when inspecting as and ld behavior (not an
130 exhaustive inspection). The default write_object_contents
131 definition sets RELOC_EXT_SIZE, so we follow suite and set it too. */
132 obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
134 /* Setting N_SET_MACHTYPE and using N_SET_FLAGS is not performed by
135 the default definition. */
136 if (bfd_get_arch (abfd) == bfd_arch_cris)
137 N_SET_MACHTYPE (*execp, M_CRIS);
139 N_SET_FLAGS (*execp, aout_backend_info (abfd)->exec_hdr_flags);
141 WRITE_HEADERS (abfd, execp);
143 return TRUE;
146 /* We need our own for these reasons:
147 - Assert that a normal 8, 16 or 32 reloc is output.
148 - Fix what seems to be a weak-bug (perhaps there for valid reasons). */
150 static void
151 MY (swap_ext_reloc_out) (bfd *abfd,
152 arelent *g,
153 struct reloc_ext_external *natptr)
155 int r_index;
156 int r_extern;
157 unsigned int r_type;
158 bfd_vma r_addend;
159 asymbol *sym = *(g->sym_ptr_ptr);
160 asection *output_section = sym->section->output_section;
162 PUT_WORD (abfd, g->address, natptr->r_address);
164 r_type = (unsigned int) g->howto->type;
166 r_addend = g->addend;
167 if ((sym->flags & BSF_SECTION_SYM) != 0)
168 r_addend += (*(g->sym_ptr_ptr))->section->output_section->vma;
170 /* If this relocation is relative to a symbol then set the
171 r_index to the symbols index, and the r_extern bit.
173 Absolute symbols can come in in two ways, either as an offset
174 from the abs section, or as a symbol which has an abs value.
175 check for that here. */
177 if (bfd_is_abs_section (bfd_get_section (sym)))
179 r_extern = 0;
180 r_index = N_ABS;
182 else if ((sym->flags & BSF_SECTION_SYM) == 0)
184 if (bfd_is_und_section (bfd_get_section (sym))
185 /* Remember to check for weak symbols; they count as global. */
186 || (sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0)
187 r_extern = 1;
188 else
189 r_extern = 0;
190 r_index = (*(g->sym_ptr_ptr))->KEEPIT;
192 else
194 /* Just an ordinary section. */
195 r_extern = 0;
196 r_index = output_section->target_index;
199 /* The relocation type is the same as the canonical ones, but only
200 the first 3 are used: RELOC_8, RELOC_16, RELOC_32.
201 We may change this later, but assert this for the moment. */
202 if (r_type > 2)
204 (*_bfd_error_handler) (_("%s: Invalid relocation type exported: %d"),
205 bfd_get_filename (abfd), r_type);
207 bfd_set_error (bfd_error_wrong_format);
210 /* Now the fun stuff. */
211 natptr->r_index[2] = r_index >> 16;
212 natptr->r_index[1] = r_index >> 8;
213 natptr->r_index[0] = r_index;
214 natptr->r_type[0] =
215 (r_extern ? RELOC_EXT_BITS_EXTERN_LITTLE : 0)
216 | (r_type << RELOC_EXT_BITS_TYPE_SH_LITTLE);
218 PUT_WORD (abfd, r_addend, natptr->r_addend);
221 /* We need our own to assert that a normal 8, 16 or 32 reloc is input. */
223 static void
224 MY (swap_ext_reloc_in) (bfd *abfd,
225 struct reloc_ext_external *bytes,
226 arelent *cache_ptr,
227 asymbol **symbols,
228 bfd_size_type symcount)
230 unsigned int r_index;
231 int r_extern;
232 unsigned int r_type;
233 struct aoutdata *su = &(abfd->tdata.aout_data->a);
235 cache_ptr->address = (GET_SWORD (abfd, bytes->r_address));
237 /* Now the fun stuff. */
238 r_index = (bytes->r_index[2] << 16)
239 | (bytes->r_index[1] << 8)
240 | bytes->r_index[0];
241 r_extern = (0 != (bytes->r_type[0] & RELOC_EXT_BITS_EXTERN_LITTLE));
242 r_type = ((bytes->r_type[0]) >> RELOC_EXT_BITS_TYPE_SH_LITTLE)
243 & RELOC_EXT_BITS_TYPE_LITTLE;
245 if (r_type > 2)
247 (*_bfd_error_handler) (_("%B: Invalid relocation type imported: %d"),
248 abfd, r_type);
250 bfd_set_error (bfd_error_wrong_format);
253 cache_ptr->howto = howto_table_ext + r_type;
255 if (r_extern && r_index > symcount)
257 (*_bfd_error_handler)
258 (_("%B: Bad relocation record imported: %d"), abfd, r_index);
260 bfd_set_error (bfd_error_wrong_format);
262 /* We continue, so we can catch further errors. */
263 r_extern = 0;
264 r_index = N_ABS;
267 /* Magically uses r_extern, symbols etc. Ugly, but it's what's in the
268 default. */
269 MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
272 /* We use the same as the default, except that we also set
273 "obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;", to avoid changing
274 NAME (aout, set_arch_mach) in aoutx. */
276 static bfd_boolean
277 MY (set_sizes) (bfd *abfd)
279 /* Just as the default in aout-target.h (with some #ifdefs folded)... */
281 adata (abfd).page_size = TARGET_PAGE_SIZE;
282 adata (abfd).segment_size = SEGMENT_SIZE;
283 adata (abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE;
284 adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;
286 /* ... except for that we have the extended reloc. The alternative
287 would be to add a check on bfd_arch_cris in NAME (aout,
288 set_arch_mach) in aoutx.h, but I don't want to do that since
289 target-specific things should not be added there. */
291 obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
293 return TRUE;