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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@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 : 16 : asm_addsleb128 (AsmScn_t *asmscn, int32_t num) 42 : : { 43 [ - + ]: 16 : if (asmscn == NULL) 44 : : return -1; 45 : : 46 [ - + - - ]: 16 : if (asmscn->type == SHT_NOBITS && unlikely (num != 0)) 47 : : { 48 : 0 : __libasm_seterrno (ASM_E_TYPE); 49 : 0 : return -1; 50 : : } 51 : : 52 [ - + ]: 16 : if (unlikely (asmscn->ctx->textp)) 53 : 0 : fprintf (asmscn->ctx->out.file, "\t.sleb128\t%" PRId32 "\n", num); 54 : : else 55 : : { 56 : 16 : char tmpbuf[(sizeof (num) * 8 + 6) / 7]; 57 : 16 : char *dest = tmpbuf; 58 : 16 : uint32_t byte; 59 : 16 : int32_t endval = num >> 31; 60 : : 61 [ + + ]: 16 : if (num == 0) 62 : : byte = 0; 63 : : else 64 : 62 : while (1) 65 : : { 66 : 38 : byte = num & 0x7f; 67 : : 68 : 38 : num >>= 7; 69 [ + + ]: 38 : if (num == endval) 70 : : /* This is the last byte. */ 71 : : break; 72 : : 73 : 24 : *dest++ = byte | 0x80; 74 : : } 75 : : 76 : 16 : *dest++ = byte; 77 : : 78 : : /* Number of bytes produced. */ 79 : 16 : size_t nbytes = dest - tmpbuf; 80 : : 81 : : /* Make sure we have enough room. */ 82 [ - + ]: 16 : if (__libasm_ensure_section_space (asmscn, nbytes) != 0) 83 : 0 : return -1; 84 : : 85 : : /* Copy the bytes. */ 86 [ + - ]: 16 : if (likely (asmscn->type != SHT_NOBITS)) 87 : 16 : memcpy (&asmscn->content->data[asmscn->content->len], tmpbuf, nbytes); 88 : : 89 : : /* Adjust the pointer in the data buffer. */ 90 : 16 : asmscn->content->len += nbytes; 91 : : 92 : : /* Increment the offset in the (sub)section. */ 93 : 16 : asmscn->offset += nbytes; 94 : : } 95 : : 96 : : return 0; 97 : : }