Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Create new COMMON symbol. |
| 2 | Copyright (C) 2002 Red Hat, Inc. |
| 3 | Written by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 4 | |
| 5 | This program is Open Source software; you can redistribute it and/or |
| 6 | modify it under the terms of the Open Software License version 1.0 as |
| 7 | published by the Open Source Initiative. |
| 8 | |
| 9 | You should have received a copy of the Open Software License along |
| 10 | with this program; if not, you may obtain a copy of the Open Software |
| 11 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 12 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 13 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
| 16 | # include <config.h> |
| 17 | #endif |
| 18 | |
| 19 | #include <inttypes.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | |
| 24 | #include <libasmP.h> |
| 25 | #include <system.h> |
| 26 | |
| 27 | |
| 28 | /* Object for special COMMON section. */ |
| 29 | static const AsmScn_t __libasm_com_scn = |
| 30 | { |
| 31 | .data = { |
| 32 | .main = { |
| 33 | .scn = ASM_COM_SCN |
| 34 | } |
| 35 | } |
| 36 | }; |
| 37 | |
| 38 | |
| 39 | AsmSym_t * |
| 40 | asm_newcomsym (ctx, name, size, align) |
| 41 | AsmCtx_t *ctx; |
| 42 | const char *name; |
| 43 | GElf_Xword size; |
| 44 | GElf_Addr align; |
| 45 | { |
| 46 | AsmSym_t *result; |
| 47 | |
| 48 | if (ctx == NULL) |
| 49 | /* Something went wrong before. */ |
| 50 | return NULL; |
| 51 | |
| 52 | /* Common symbols are public. Therefore the user must provide a |
| 53 | name. */ |
| 54 | if (name == NULL) |
| 55 | { |
| 56 | __libasm_seterrno (ASM_E_INVALID); |
| 57 | return NULL; |
| 58 | } |
| 59 | |
| 60 | rwlock_wrlock (ctx->lock); |
| 61 | |
| 62 | result = (AsmSym_t *) malloc (sizeof (AsmSym_t)); |
| 63 | if (result == NULL) |
| 64 | return NULL; |
| 65 | |
| 66 | result->scn = (AsmScn_t *) &__libasm_com_scn; |
| 67 | result->size = size; |
| 68 | /* XXX Do we have to allow a different type? */ |
| 69 | result->type = STT_OBJECT; |
| 70 | /* XXX Do we have to allow a different binding? */ |
| 71 | result->binding = STB_GLOBAL; |
| 72 | result->symidx = 0; |
| 73 | result->strent = ebl_strtabadd (ctx->symbol_strtab, name, 0); |
| 74 | |
| 75 | /* The value of a COM symbol is the alignment. Since there are no |
| 76 | subsection and the initial offset of the section is 0 we can get |
| 77 | the alignment recorded by storing it into the offset field. */ |
| 78 | result->offset = align; |
| 79 | |
| 80 | if (unlikely (ctx->textp)) |
| 81 | fprintf (ctx->out.file, "\t.comm %s, %" PRIuMAX ", %" PRIuMAX "\n", |
| 82 | name, (uintmax_t) size, (uintmax_t) align); |
| 83 | else |
| 84 | { |
| 85 | /* Put the symbol in the hash table so that we can later find it. */ |
| 86 | if (asm_symbol_tab_insert (&ctx->symbol_tab, elf_hash (name), result) |
| 87 | != 0) |
| 88 | { |
| 89 | /* The symbol already exists. */ |
| 90 | __libasm_seterrno (ASM_E_DUPLSYM); |
| 91 | free (result); |
| 92 | result = NULL; |
| 93 | } |
| 94 | else if (name != NULL && asm_emit_symbol_p (name)) |
| 95 | /* Only count non-private symbols. */ |
| 96 | ++ctx->nsymbol_tab; |
| 97 | } |
| 98 | |
| 99 | rwlock_unlock (ctx->lock); |
| 100 | |
| 101 | return result; |
| 102 | } |