diff options
Diffstat (limited to 'elfutils/libasm/asm_addsleb128.c')
-rw-r--r-- | elfutils/libasm/asm_addsleb128.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/elfutils/libasm/asm_addsleb128.c b/elfutils/libasm/asm_addsleb128.c new file mode 100644 index 00000000..614ba69c --- /dev/null +++ b/elfutils/libasm/asm_addsleb128.c @@ -0,0 +1,96 @@ +/* Add signed little endian base 128 integer to a section. + Copyright (C) 2002, 2005 Red Hat, Inc. + This file is part of Red Hat elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 2002. + + Red Hat elfutils is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by the + Free Software Foundation; version 2 of the License. + + Red Hat elfutils is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License along + with Red Hat elfutils; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. + + Red Hat elfutils is an included package of the Open Invention Network. + An included package of the Open Invention Network is a package for which + Open Invention Network licensees cross-license their patents. No patent + license is granted, either expressly or impliedly, by designation as an + included package. Should you wish to participate in the Open Invention + Network licensing program, please visit www.openinventionnetwork.com + <http://www.openinventionnetwork.com>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <inttypes.h> +#include <string.h> + +#include <libasmP.h> + + +int +asm_addsleb128 (asmscn, num) + AsmScn_t *asmscn; + int32_t num; +{ + if (asmscn == NULL) + return -1; + + if (asmscn->type == SHT_NOBITS && unlikely (num != 0)) + { + __libasm_seterrno (ASM_E_TYPE); + return -1; + } + + if (unlikely (asmscn->ctx->textp)) + fprintf (asmscn->ctx->out.file, "\t.sleb128\t%" PRId32 "\n", num); + else + { + char tmpbuf[(sizeof (num) * 8 + 6) / 7]; + char *dest = tmpbuf; + uint32_t byte; + int32_t endval = num >> 31; + + if (num == 0) + byte = 0; + else + while (1) + { + byte = num & 0x7f; + + num >>= 7; + if (num == endval) + /* This is the last byte. */ + break; + + *dest++ = byte | 0x80; + } + + *dest++ = byte; + + /* Number of bytes produced. */ + size_t nbytes = dest - tmpbuf; + + /* Make sure we have enough room. */ + if (__libasm_ensure_section_space (asmscn, nbytes) != 0) + return -1; + + /* Copy the bytes. */ + if (likely (asmscn->type != SHT_NOBITS)) + memcpy (&asmscn->content->data[asmscn->content->len], tmpbuf, nbytes); + + /* Adjust the pointer in the data buffer. */ + asmscn->content->len += nbytes; + + /* Increment the offset in the (sub)section. */ + asmscn->offset += nbytes; + } + + return 0; +} |