49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe/*
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe Copyright (C) 2000,2004 Silicon Graphics, Inc. All Rights Reserved.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe This program is free software; you can redistribute it and/or modify it
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe under the terms of version 2.1 of the GNU Lesser General Public License
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe as published by the Free Software Foundation.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe This program is distributed in the hope that it would be useful, but
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe WITHOUT ANY WARRANTY; without even the implied warranty of
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe Further, this software is distributed without any warranty that it is
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe free of the rightful claim of any third person regarding infringement
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe or the like. Any license provided herein, whether implied or
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe otherwise, applies only to this software file. Patent licenses, if
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe any, provided herein do not apply to combinations of this program with
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe other software, or any other product whatsoever.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe You should have received a copy of the GNU Lesser General Public
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe License along with this program; if not, write the Free Software
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301,
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe USA.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane,
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe Mountain View, CA 94043, or:
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe http://www.sgi.com
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe For further information regarding this notice, see:
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe http://oss.sgi.com/projects/GenInfo/NoticeExplan
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe*/
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#include "config.h"
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#include "libdwarfdefs.h"
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#include <string.h>
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#include "pro_incl.h"
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#define MORE_BYTES 0x80
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#define DATA_MASK 0x7f
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#define DIGIT_WIDTH 7
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe#define SIGN_BIT 0x40
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe/*-------------------------------------------------------------
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe Encode val as a leb128. This encodes it as an unsigned
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe number.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe---------------------------------------------------------------*/
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe/* return DW_DLV_ERROR or DW_DLV_OK.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** space to write leb number is provided by caller, with caller
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** passing length.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** number of bytes used returned thru nbytes arg
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe*/
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Loweint
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe_dwarf_pro_encode_leb128_nm(Dwarf_Unsigned val, int *nbytes,
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe char *space, int splen)
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe{
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe char *a;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe char *end = space + splen;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe a = space;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe do {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe unsigned char uc;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe if (a >= end) {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe return DW_DLV_ERROR;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe }
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe uc = val & DATA_MASK;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe val >>= DIGIT_WIDTH;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe if (val != 0) {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe uc |= MORE_BYTES;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe }
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe *a = uc;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe a++;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe } while (val);
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe *nbytes = a - space;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe return DW_DLV_OK;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe}
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe/* return DW_DLV_ERROR or DW_DLV_OK.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** space to write leb number is provided by caller, with caller
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** passing length.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** number of bytes used returned thru nbytes arg
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe** encodes a signed number.
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe*/
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Loweint
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe_dwarf_pro_encode_signed_leb128_nm(Dwarf_Signed value, int *nbytes,
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe char *space, int splen)
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe{
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe char *str;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe Dwarf_Signed sign = -(value < 0);
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe int more = 1;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe char *end = space + splen;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe str = space;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe do {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe unsigned char byte = value & DATA_MASK;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe value >>= DIGIT_WIDTH;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe if (str >= end) {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe return DW_DLV_ERROR;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe }
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe /*
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe * Remaining chunks would just contain the sign bit, and this chunk
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe * has already captured at least one sign bit.
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe */
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe if (value == sign && ((byte & SIGN_BIT) == (sign & SIGN_BIT))) {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe more = 0;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe } else {
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe byte |= MORE_BYTES;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe }
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe *str = byte;
07dc1947c362e187fb955d283b692f8769dd5defRichard Lowe str++;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe } while (more);
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe *nbytes = str - space;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe return DW_DLV_OK;
49d3bc91e27cd871b950d56c01398fa2f2e12ab4Richard Lowe}