1 /* Add signed little endian base 128 integer to a section. 2 Copyright (C) 2002, 2005 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <inttypes.h> 35 #include <string.h> 36 37 #include <libasmP.h> 38 39 40 int 41 asm_addsleb128 (AsmScn_t *asmscn, int32_t num) 42 { 43 if (asmscn == NULL) 44 return -1; 45 46 if (asmscn->type == SHT_NOBITS && unlikely (num != 0)) 47 { 48 __libasm_seterrno (ASM_E_TYPE); 49 return -1; 50 } 51 52 if (unlikely (asmscn->ctx->textp)) 53 fprintf (asmscn->ctx->out.file, "\t.sleb128\t%" PRId32 "\n", num); 54 else 55 { 56 char tmpbuf[(sizeof (num) * 8 + 6) / 7]; 57 char *dest = tmpbuf; 58 uint32_t byte; 59 int32_t endval = num >> 31; 60 61 if (num == 0) 62 byte = 0; 63 else 64 while (1) 65 { 66 byte = num & 0x7f; 67 68 num >>= 7; 69 if (num == endval) 70 /* This is the last byte. */ 71 break; 72 73 *dest++ = byte | 0x80; 74 } 75 76 *dest++ = byte; 77 78 /* Number of bytes produced. */ 79 size_t nbytes = dest - tmpbuf; 80 81 /* Make sure we have enough room. */ 82 if (__libasm_ensure_section_space (asmscn, nbytes) != 0) 83 return -1; 84 85 /* Copy the bytes. */ 86 if (likely (asmscn->type != SHT_NOBITS)) 87 memcpy (&asmscn->content->data[asmscn->content->len], tmpbuf, nbytes); 88 89 /* Adjust the pointer in the data buffer. */ 90 asmscn->content->len += nbytes; 91 92 /* Increment the offset in the (sub)section. */ 93 asmscn->offset += nbytes; 94 } 95 96 return 0; 97 } 98
