1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <stdio.h> 30 #include <proc_service.h> 31 #include <link.h> 32 #include <rtld_db.h> 33 #include <_rtld_db.h> 34 #include <msg.h> 35 36 37 /* 38 * A un-initialized PLT look like so: 39 * 40 * .PLT 41 * sethi (.-.PLT0), %g1 42 * ba,a .PLT0 43 * nop 44 * 45 * To test to see if this is an uninitialized PLT we check 46 * the second instruction and confirm that it's a branch. 47 */ 48 /* ARGSUSED 2 */ 49 rd_err_e 50 plt32_resolution(rd_agent_t *rap, psaddr_t pc, lwpid_t lwpid, 51 psaddr_t pltbase, rd_plt_info_t *rpi) 52 { 53 unsigned int instr[4]; 54 rd_err_e rerr; 55 psaddr_t destaddr = 0; 56 psaddr_t pltoff, pltaddr; 57 int pltbound = 0; 58 59 pltoff = pc - pltbase; 60 pltaddr = pltbase + 61 ((pltoff / M32_PLT_ENTSIZE) * M32_PLT_ENTSIZE); 62 63 if (ps_pread(rap->rd_psp, pltaddr, (char *)instr, 64 M32_PLT_ENTSIZE) != PS_OK) { 65 LOG(ps_plog(MSG_ORIG(MSG_DB_READFAIL_2), EC_ADDR(pltaddr))); 66 return (RD_ERR); 67 } 68 69 if (rtld_db_version >= RD_VERSION3) { 70 rpi->pi_flags = 0; 71 rpi->pi_baddr = 0; 72 } 73 74 if ((instr[0] != M_NOP) && 75 ((instr[1] & (~(S_MASK(22)))) == M_BA_A)) { 76 /* 77 * Unbound PLT 78 */ 79 if ((rerr = rd_binder_exit_addr(rap, MSG_ORIG(MSG_SYM_RTBIND), 80 &(rpi->pi_target))) != RD_OK) { 81 return (rerr); 82 } 83 rpi->pi_skip_method = RD_RESOLVE_TARGET_STEP; 84 rpi->pi_nstep = 1; 85 } else if ((instr[2] & (~(S_MASK(13)))) == M_JMPL) { 86 /* 87 * Resolved 32-bit PLT entry format (full-32): 88 * 89 * .PLT: 90 * 0 sethi (.-PLT0), %g1 91 * 1 sethi %hi(dest), %g1 92 * 2 jmpl %g1 + lo(dest), %g0 93 * 3 nop 94 */ 95 rpi->pi_skip_method = RD_RESOLVE_STEP; 96 rpi->pi_nstep = 4; 97 rpi->pi_target = 0; 98 if (rtld_db_version >= RD_VERSION3) { 99 uint_t hi_bits; 100 uint_t lo_bits; 101 hi_bits = instr[1] & S_MASK(22); /* 31..10 */ 102 lo_bits = instr[2] & S_MASK(10); /* 09..00 */ 103 destaddr = (hi_bits << 10) | lo_bits; 104 pltbound++; 105 } 106 } else if ((instr[0] == M_NOP) && 107 ((instr[1] & (~(S_MASK(22)))) == M_BA_A)) { 108 /* 109 * Resolved 32-bit PLT entry format (b+-8mb): 110 * .PLT 111 * 0 nop 112 * 1 ba,a <dest> 113 * 2 nop 114 * 3 nop 115 */ 116 rpi->pi_skip_method = RD_RESOLVE_STEP; 117 rpi->pi_nstep = 2; 118 rpi->pi_target = 0; 119 if (rtld_db_version >= RD_VERSION3) { 120 uint_t d22; 121 d22 = instr[1] & S_MASK(22); 122 destaddr = ((int)pltaddr + 4) + 123 (((int)d22 << 10) >> 8); 124 pltbound++; 125 } 126 } else if ((instr[0] == M_NOP) && 127 ((instr[1] & (~(S_MASK(19)))) == M_BA_A_PT)) { 128 /* 129 * Resolved 32-bit PLT entry format (b+-2mb): 130 * .PLT 131 * 0 nop 132 * 1 ba,a,pt %icc, <dest> 133 * 2 nop 134 * 3 nop 135 */ 136 rpi->pi_skip_method = RD_RESOLVE_STEP; 137 rpi->pi_nstep = 2; 138 rpi->pi_target = 0; 139 if (rtld_db_version >= RD_VERSION3) { 140 uint_t d19; 141 d19 = instr[1] & S_MASK(22); 142 destaddr = ((int)pltaddr + 4) + 143 (((int)d19 << 13) >> 11); 144 pltbound++; 145 } 146 } else 147 rpi->pi_skip_method = RD_RESOLVE_NONE; 148 149 if ((rtld_db_version >= RD_VERSION3) && pltbound) { 150 rpi->pi_flags |= RD_FLG_PI_PLTBOUND; 151 rpi->pi_baddr = destaddr; 152 } 153 return (RD_OK); 154 } 155