Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Add signed little endian base 128 integer to a section. |
| 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 <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 | } |