Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Align section. |
Ulrich Drepper | a38998e | 2005-08-03 02:05:39 +0000 | [diff] [blame] | 2 | Copyright (C) 2002, 2005 Red Hat, Inc. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 3 | This file is part of Red Hat elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 5 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 9 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
Ulrich Drepper | 1e9ef50 | 2006-04-04 22:29:06 +0000 | [diff] [blame] | 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 18 | |
| 19 | Red Hat elfutils is an included package of the Open Invention Network. |
| 20 | An included package of the Open Invention Network is a package for which |
| 21 | Open Invention Network licensees cross-license their patents. No patent |
| 22 | license is granted, either expressly or impliedly, by designation as an |
| 23 | included package. Should you wish to participate in the Open Invention |
| 24 | Network licensing program, please visit www.openinventionnetwork.com |
| 25 | <http://www.openinventionnetwork.com>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | # include <config.h> |
| 29 | #endif |
| 30 | |
Ulrich Drepper | a38998e | 2005-08-03 02:05:39 +0000 | [diff] [blame] | 31 | #include <inttypes.h> |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 32 | #include <stdlib.h> |
| 33 | #include <sys/param.h> |
| 34 | |
| 35 | #include <libasmP.h> |
| 36 | #include <system.h> |
| 37 | |
| 38 | |
| 39 | int |
| 40 | asm_align (asmscn, value) |
| 41 | AsmScn_t *asmscn; |
| 42 | GElf_Word value; |
| 43 | { |
| 44 | if (asmscn == NULL) |
| 45 | /* An earlier error. */ |
| 46 | return -1; |
| 47 | |
| 48 | /* The alignment value must be a power of two. */ |
| 49 | if (unlikely (! powerof2 (value))) |
| 50 | { |
| 51 | __libasm_seterrno (ASM_E_INVALID); |
| 52 | return -1; |
| 53 | } |
| 54 | |
Ulrich Drepper | a38998e | 2005-08-03 02:05:39 +0000 | [diff] [blame] | 55 | if (unlikely (asmscn->ctx->textp)) |
| 56 | { |
| 57 | fprintf (asmscn->ctx->out.file, "\t.align %" PRId32 ", ", |
| 58 | (int32_t) value); |
| 59 | if (asmscn->pattern->len == 1) |
| 60 | fprintf (asmscn->ctx->out.file, "%02hhx\n", asmscn->pattern->bytes[0]); |
| 61 | else |
| 62 | { |
| 63 | fputc_unlocked ('"', asmscn->ctx->out.file); |
| 64 | |
| 65 | for (size_t cnt = 0; cnt < asmscn->pattern->len; ++cnt) |
| 66 | fprintf (asmscn->ctx->out.file, "\\x%02hhx", |
| 67 | asmscn->pattern->bytes[cnt]); |
| 68 | |
| 69 | fputs_unlocked ("\"\n", asmscn->ctx->out.file); |
| 70 | } |
| 71 | return 0; |
| 72 | } |
| 73 | |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 74 | rwlock_wrlock (asmscn->ctx->lock); |
| 75 | |
| 76 | int result = 0; |
| 77 | |
| 78 | /* Fillbytes necessary? */ |
| 79 | if ((asmscn->offset & (value - 1)) != 0) |
| 80 | { |
| 81 | /* Add fillbytes. */ |
Ulrich Drepper | a38998e | 2005-08-03 02:05:39 +0000 | [diff] [blame] | 82 | size_t cnt = value - (asmscn->offset & (value - 1)); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 83 | |
| 84 | /* Ensure there is enough room to add the fill bytes. */ |
| 85 | result = __libasm_ensure_section_space (asmscn, cnt); |
| 86 | if (result != 0) |
| 87 | goto out; |
| 88 | |
| 89 | /* Fill in the bytes. We align the pattern according to the |
| 90 | current offset. */ |
Ulrich Drepper | a38998e | 2005-08-03 02:05:39 +0000 | [diff] [blame] | 91 | size_t byteptr = asmscn->offset % asmscn->pattern->len; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 92 | |
| 93 | /* Update the total size. */ |
| 94 | asmscn->offset += cnt; |
| 95 | |
| 96 | do |
| 97 | { |
| 98 | asmscn->content->data[asmscn->content->len++] |
| 99 | = asmscn->pattern->bytes[byteptr++]; |
| 100 | |
| 101 | if (byteptr == asmscn->pattern->len) |
| 102 | byteptr = 0; |
| 103 | } |
| 104 | while (--cnt > 0); |
| 105 | } |
| 106 | |
| 107 | /* Remember the maximum alignment for this subsection. */ |
| 108 | if (asmscn->max_align < value) |
| 109 | { |
| 110 | asmscn->max_align = value; |
| 111 | |
| 112 | /* Update the parent as well (if it exists). */ |
| 113 | if (asmscn->subsection_id != 0) |
| 114 | { |
| 115 | rwlock_wrlock (asmscn->data.up->ctx->lock); |
| 116 | |
| 117 | if (asmscn->data.up->max_align < value) |
| 118 | asmscn->data.up->max_align = value; |
| 119 | |
| 120 | rwlock_unlock (asmscn->data.up->ctx->lock); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | out: |
| 125 | rwlock_unlock (asmscn->ctx->lock); |
| 126 | |
| 127 | return result; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /* Ensure there are at least LEN bytes available in the output buffer |
| 132 | for ASMSCN. */ |
| 133 | int |
| 134 | __libasm_ensure_section_space (asmscn, len) |
| 135 | AsmScn_t *asmscn; |
| 136 | size_t len; |
| 137 | { |
| 138 | /* The blocks with the section content are kept in a circular |
| 139 | single-linked list. */ |
| 140 | size_t size; |
| 141 | |
| 142 | if (asmscn->content == NULL) |
| 143 | { |
| 144 | /* This is the first block. */ |
| 145 | size = MAX (2 * len, 960); |
| 146 | |
| 147 | asmscn->content = (struct AsmData *) malloc (sizeof (struct AsmData) |
| 148 | + size); |
| 149 | if (asmscn->content == NULL) |
| 150 | return -1; |
| 151 | |
| 152 | asmscn->content->next = asmscn->content; |
| 153 | } |
| 154 | else |
| 155 | { |
| 156 | struct AsmData *newp; |
| 157 | |
| 158 | if (asmscn->content->maxlen - asmscn->content->len >= len) |
| 159 | /* Nothing to do, there is enough space. */ |
| 160 | return 0; |
| 161 | |
| 162 | size = MAX (2 *len, MIN (32768, 2 * asmscn->offset)); |
| 163 | |
| 164 | newp = (struct AsmData *) malloc (sizeof (struct AsmData) + size); |
| 165 | if (newp == NULL) |
| 166 | return -1; |
| 167 | |
| 168 | newp->next = asmscn->content->next; |
| 169 | asmscn->content = asmscn->content->next = newp; |
| 170 | } |
| 171 | |
| 172 | asmscn->content->len = 0; |
| 173 | asmscn->content->maxlen = size; |
| 174 | |
| 175 | return 0; |
| 176 | } |