Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Create descriptor for assembling. |
| 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 <assert.h> |
| 20 | #include <errno.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <gelf.h> |
| 26 | #include "libasmP.h" |
| 27 | #include <system.h> |
| 28 | |
| 29 | |
| 30 | static AsmCtx_t * |
| 31 | prepare_text_output (AsmCtx_t *result) |
| 32 | { |
| 33 | return result; |
| 34 | } |
| 35 | |
| 36 | |
| 37 | static AsmCtx_t * |
| 38 | prepare_binary_output (AsmCtx_t *result, int machine, int klass, int data) |
| 39 | { |
| 40 | GElf_Ehdr *ehdr; |
| 41 | GElf_Ehdr ehdr_mem; |
| 42 | |
| 43 | /* Create the ELF descriptor for the file. */ |
| 44 | result->out.elf = elf_begin (result->fd, ELF_C_WRITE_MMAP, NULL); |
| 45 | if (result->out.elf == NULL) |
| 46 | { |
| 47 | err_libelf: |
| 48 | unlink (result->tmp_fname); |
| 49 | close (result->fd); |
| 50 | free (result); |
| 51 | __libasm_seterrno (ASM_E_LIBELF); |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | /* Create the ELF header for the output file. */ |
| 56 | if (gelf_newehdr (result->out.elf, klass) == 0) |
| 57 | goto err_libelf; |
| 58 | |
| 59 | ehdr = gelf_getehdr (result->out.elf, &ehdr_mem); |
| 60 | /* If this failed we are in trouble. */ |
| 61 | assert (ehdr != NULL); |
| 62 | |
| 63 | /* We create an object file. */ |
| 64 | ehdr->e_type = ET_REL; |
| 65 | /* Set the ELF version. */ |
| 66 | ehdr->e_version = EV_CURRENT; |
| 67 | |
| 68 | /* Use the machine value the user provided. */ |
| 69 | ehdr->e_machine = machine; |
| 70 | /* Same for the class and endianness. */ |
| 71 | ehdr->e_ident[EI_CLASS] = klass; |
| 72 | ehdr->e_ident[EI_DATA] = data; |
| 73 | |
| 74 | memcpy (&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG); |
| 75 | |
| 76 | /* Write the ELF header information back. */ |
| 77 | (void) gelf_update_ehdr (result->out.elf, ehdr); |
| 78 | |
| 79 | /* No section so far. */ |
| 80 | result->section_list = NULL; |
| 81 | |
| 82 | /* Initialize the hash table. */ |
| 83 | asm_symbol_tab_init (&result->symbol_tab, 67); |
| 84 | result->nsymbol_tab = 0; |
| 85 | /* And the string tables. */ |
| 86 | result->section_strtab = ebl_strtabinit (true); |
| 87 | result->symbol_strtab = ebl_strtabinit (true); |
| 88 | |
| 89 | /* We have no section groups so far. */ |
| 90 | result->groups = NULL; |
| 91 | result->ngroups = 0; |
| 92 | |
| 93 | return result; |
| 94 | } |
| 95 | |
| 96 | |
| 97 | AsmCtx_t * |
| 98 | asm_begin (fname, textp, machine, klass, data) |
| 99 | const char *fname; |
| 100 | bool textp; |
| 101 | int machine; |
| 102 | int klass; |
| 103 | int data; |
| 104 | { |
| 105 | size_t fname_len = strlen (fname); |
| 106 | AsmCtx_t *result; |
| 107 | |
| 108 | |
| 109 | /* First order of business: find the appropriate backend. If it |
| 110 | does not exist we don't have to look further. */ |
| 111 | // XXX |
| 112 | |
| 113 | /* Create the file descriptor. We do not generate the output file |
| 114 | right away. Instead we create a temporary file in the same |
| 115 | directory which, if everything goes alright, will replace a |
| 116 | possibly existing file with the given name. */ |
| 117 | result = (AsmCtx_t *) malloc (sizeof (AsmCtx_t) + 2 * fname_len + 9); |
| 118 | if (result == NULL) |
| 119 | return NULL; |
| 120 | |
| 121 | /* Initialize the lock. */ |
| 122 | rwlock_init (result->lock); |
| 123 | |
| 124 | /* Create the name of the temporary file. */ |
| 125 | result->fname = stpcpy (mempcpy (result->tmp_fname, fname, fname_len), |
| 126 | ".XXXXXX") + 1; |
| 127 | memcpy (result->fname, fname, fname_len + 1); |
| 128 | |
| 129 | /* Create the temporary file. */ |
| 130 | result->fd = mkstemp (result->tmp_fname); |
| 131 | if (result->fd == -1) |
| 132 | { |
| 133 | int save_errno = errno; |
| 134 | free (result); |
| 135 | __libasm_seterrno (ASM_E_CANNOT_CREATE); |
| 136 | errno = save_errno; |
| 137 | return NULL; |
| 138 | } |
| 139 | |
| 140 | /* Initialize the counter for temporary symbols. */ |
| 141 | result->tempsym_count = 0; |
| 142 | |
| 143 | /* Now we differentiate between textual and binary output. */ |
| 144 | result->textp = textp; |
| 145 | if (textp) |
| 146 | result = prepare_text_output (result); |
| 147 | else |
| 148 | result = prepare_binary_output (result, machine, klass, data); |
| 149 | |
| 150 | return result; |
| 151 | } |