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3c3bdf30 | 1 | # This shell script emits a C file. -*- C -*- |
48fa4a5d | 2 | # Copyright 2001, 2002 Free Software Foundation, Inc. |
3c3bdf30 NC |
3 | # |
4 | # This file is part of GLD, the Gnu Linker. | |
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, write to the Free Software | |
18 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | # | |
20 | ||
21 | # This file is sourced from elf32.em and mmo.em, used to define | |
22 | # MMIX-specific things common to ELF and MMO. | |
23 | ||
24 | cat >>e${EMULATION_NAME}.c <<EOF | |
25 | #include "elf/mmix.h" | |
26 | ||
48fa4a5d HPN |
27 | static void mmix_before_allocation PARAMS ((void)); |
28 | static void mmix_after_allocation PARAMS ((void)); | |
29 | ||
30 | /* Set up handling of linker-allocated global registers. */ | |
31 | ||
32 | static void | |
33 | mmix_before_allocation () | |
34 | { | |
35 | /* Call the default first. */ | |
36 | gld${EMULATION_NAME}_before_allocation (); | |
37 | ||
38 | /* There's a needrelax.em which uses this ..._before_allocation-hook and | |
39 | just has the statement below as payload. It's more of a hassle to | |
40 | use that than to just include these two lines and take the | |
41 | maintenance burden to keep them in sync. (Of course we lose the | |
42 | maintenance burden of checking that it still does what we need.) */ | |
43 | ||
44 | /* Force -relax on if not doing a relocatable link. */ | |
45 | if (! link_info.relocateable) | |
46 | command_line.relax = true; | |
47 | ||
48 | if (!_bfd_mmix_prepare_linker_allocated_gregs (output_bfd, &link_info)) | |
49 | einfo ("%X%P: Internal problems setting up section %s", | |
50 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); | |
51 | } | |
3c3bdf30 NC |
52 | |
53 | /* We need to set the VMA of the .MMIX.reg_contents section when it has | |
48fa4a5d HPN |
54 | been allocated, and produce the final settings for the linker-generated |
55 | GREGs. */ | |
3c3bdf30 NC |
56 | |
57 | static void | |
48fa4a5d | 58 | mmix_after_allocation () |
3c3bdf30 NC |
59 | { |
60 | asection *sec | |
61 | = bfd_get_section_by_name (output_bfd, MMIX_REG_CONTENTS_SECTION_NAME); | |
8017dbcb | 62 | bfd_signed_vma regvma; |
3c3bdf30 | 63 | |
83c2d653 HPN |
64 | /* If there's no register section, we don't need to do anything. On the |
65 | other hand, if a non-standard linker-script without a mapping from | |
66 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME is present, as in the ld | |
67 | test "NOCROSSREFS 2", that section (1) will be orphaned; not inserted | |
68 | in MMIX_REG_CONTENTS_SECTION_NAME and (2) we will not do the | |
69 | necessary preparations for those relocations that caused it to be | |
70 | created. We'll SEGV from the latter error. The former error in | |
71 | separation will result in a non-working binary, but that's expected | |
72 | when you play tricks with linker scripts. The "NOCROSSREFS 2" test | |
73 | does not run the output so it does not matter there. */ | |
74 | if (sec == NULL) | |
75 | sec | |
76 | = bfd_get_section_by_name (output_bfd, | |
77 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); | |
3c3bdf30 NC |
78 | if (sec == NULL) |
79 | return; | |
80 | ||
81 | regvma = 256 * 8 - sec->_raw_size - 8; | |
82 | ||
74c44237 HPN |
83 | /* If we start on a local register, we have too many global registers. |
84 | We treat this error as nonfatal (meaning processing will continue in | |
85 | search for other errors), because it's a link error in the same way | |
86 | as an undefined symbol. */ | |
3c3bdf30 | 87 | if (regvma < 32 * 8) |
74c44237 HPN |
88 | { |
89 | einfo ("%X%P: Too many global registers: %u, max 223\n", | |
90 | (unsigned) sec->_raw_size / 8); | |
91 | regvma = 32 * 8; | |
92 | } | |
3c3bdf30 NC |
93 | |
94 | /* Set vma to correspond to first such register number * 8. */ | |
8017dbcb | 95 | bfd_set_section_vma (output_bfd, sec, (bfd_vma) regvma); |
3c3bdf30 NC |
96 | |
97 | /* ??? Why isn't the section size (_cooked_size) set? Doesn't it get | |
98 | set regardless of presence of relocations? */ | |
99 | if (sec->_cooked_size == 0 | |
100 | && ! bfd_set_section_size (output_bfd, sec, sec->_raw_size)) | |
101 | { | |
74c44237 HPN |
102 | /* This is a fatal error; make the einfo call not return. */ |
103 | einfo ("%F%P: Can't set section %s size to %u\n", | |
3c3bdf30 | 104 | MMIX_REG_CONTENTS_SECTION_NAME, (unsigned) sec->_raw_size); |
3c3bdf30 NC |
105 | } |
106 | ||
107 | /* Simplify symbol output for the register section (without contents; | |
48fa4a5d HPN |
108 | created for register symbols) by setting the output offset to 0. |
109 | This section is only present when there are register symbols. */ | |
3c3bdf30 | 110 | sec = bfd_get_section_by_name (output_bfd, MMIX_REG_SECTION_NAME); |
48fa4a5d HPN |
111 | if (sec != NULL) |
112 | bfd_set_section_vma (abfd, sec, 0); | |
3c3bdf30 | 113 | |
48fa4a5d HPN |
114 | if (!_bfd_mmix_finalize_linker_allocated_gregs (output_bfd, &link_info)) |
115 | { | |
74c44237 HPN |
116 | /* This is a fatal error; make einfo call not return. */ |
117 | einfo ("%F%P: Can't finalize linker-allocated global registers\n"); | |
48fa4a5d | 118 | } |
3c3bdf30 NC |
119 | } |
120 | EOF | |
121 | ||
48fa4a5d HPN |
122 | LDEMUL_AFTER_ALLOCATION=mmix_after_allocation |
123 | LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation |