1 /* Add signed little endian base 128 integer to a section. 2 Copyright (C) 2002 Red Hat, Inc. 3 Written by Ulrich Drepper <drepper (at) 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 <string.h> 21 22 #include <libasmP.h> 23 24 25 int 26 asm_addsleb128 (asmscn, num) 27 AsmScn_t *asmscn; 28 int32_t num; 29 { 30 if (asmscn == NULL) 31 return -1; 32 33 if (asmscn->type == SHT_NOBITS && unlikely (num != 0)) 34 { 35 __libasm_seterrno (ASM_E_TYPE); 36 return -1; 37 } 38 39 if (unlikely (asmscn->ctx->textp)) 40 printf ("\t.sleb128\t%" PRId32 "\n", num); 41 else 42 { 43 char tmpbuf[(sizeof (num) * 8 + 6) / 7]; 44 char *dest = tmpbuf; 45 uint32_t byte; 46 int32_t endval = num >> 31; 47 48 if (num == 0) 49 byte = 0; 50 else 51 while (1) 52 { 53 byte = num & 0x7f; 54 55 num >>= 7; 56 if (num == endval) 57 /* This is the last byte. */ 58 break; 59 60 *dest++ = byte | 0x80; 61 } 62 63 *dest++ = byte; 64 65 /* Number of bytes produced. */ 66 size_t nbytes = dest - tmpbuf; 67 68 /* Make sure we have enough room. */ 69 if (__libasm_ensure_section_space (asmscn, nbytes) != 0) 70 return -1; 71 72 /* Copy the bytes. */ 73 if (likely (asmscn->type != SHT_NOBITS)) 74 memcpy (&asmscn->content->data[asmscn->content->len], tmpbuf, nbytes); 75 76 /* Adjust the pointer in the data buffer. */ 77 asmscn->content->len += nbytes; 78 79 /* Increment the offset in the (sub)section. */ 80 asmscn->offset += nbytes; 81 } 82 83 return 0; 84 } 85
