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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <proc_service.h>
#include <link.h>
#include <rtld_db.h>
#include <_rtld_db.h>
#include <msg.h>
/*
* A un-initialized PLT look like so:
*
* .PLT
* sethi (.-.PLT0), %g1
* ba,a .PLT0
* nop
*
* To test to see if this is an uninitialized PLT we check
* the second instruction and confirm that it's a branch.
*/
/* ARGSUSED 2 */
rd_err_e
plt32_resolution(rd_agent_t *rap, psaddr_t pc, lwpid_t lwpid,
psaddr_t pltbase, rd_plt_info_t *rpi)
{
unsigned int instr[4];
rd_err_e rerr;
psaddr_t destaddr = 0;
psaddr_t pltoff, pltaddr;
int pltbound = 0;
pltoff = pc - pltbase;
pltaddr = pltbase +
((pltoff / M32_PLT_ENTSIZE) * M32_PLT_ENTSIZE);
if (ps_pread(rap->rd_psp, pltaddr, (char *)instr,
M32_PLT_ENTSIZE) != PS_OK) {
LOG(ps_plog(MSG_ORIG(MSG_DB_READFAIL_2), EC_ADDR(pltaddr)));
return (RD_ERR);
}
if (rtld_db_version >= RD_VERSION3) {
rpi->pi_flags = 0;
rpi->pi_baddr = 0;
}
if ((instr[0] != M_NOP) &&
((instr[1] & (~(S_MASK(22)))) == M_BA_A)) {
/*
* Unbound PLT
*/
if ((rerr = rd_binder_exit_addr(rap, MSG_ORIG(MSG_SYM_RTBIND),
&(rpi->pi_target))) != RD_OK) {
return (rerr);
}
rpi->pi_skip_method = RD_RESOLVE_TARGET_STEP;
rpi->pi_nstep = 1;
} else if ((instr[2] & (~(S_MASK(13)))) == M_JMPL) {
/*
* Resolved 32-bit PLT entry format (full-32):
*
* .PLT:
* 0 sethi (.-PLT0), %g1
* 1 sethi %hi(dest), %g1
* 2 jmpl %g1 + lo(dest), %g0
* 3 nop
*/
rpi->pi_skip_method = RD_RESOLVE_STEP;
rpi->pi_nstep = 4;
rpi->pi_target = 0;
if (rtld_db_version >= RD_VERSION3) {
uint_t hi_bits;
uint_t lo_bits;
hi_bits = instr[1] & S_MASK(22); /* 31..10 */
lo_bits = instr[2] & S_MASK(10); /* 09..00 */
destaddr = (hi_bits << 10) | lo_bits;
pltbound++;
}
} else if ((instr[0] == M_NOP) &&
((instr[1] & (~(S_MASK(22)))) == M_BA_A)) {
/*
* Resolved 32-bit PLT entry format (b+-8mb):
* .PLT
* 0 nop
* 1 ba,a <dest>
* 2 nop
* 3 nop
*/
rpi->pi_skip_method = RD_RESOLVE_STEP;
rpi->pi_nstep = 2;
rpi->pi_target = 0;
if (rtld_db_version >= RD_VERSION3) {
uint_t d22;
d22 = instr[1] & S_MASK(22);
destaddr = ((int)pltaddr + 4) +
(((int)d22 << 10) >> 8);
pltbound++;
}
} else if ((instr[0] == M_NOP) &&
((instr[1] & (~(S_MASK(19)))) == M_BA_A_PT)) {
/*
* Resolved 32-bit PLT entry format (b+-2mb):
* .PLT
* 0 nop
* 1 ba,a,pt %icc, <dest>
* 2 nop
* 3 nop
*/
rpi->pi_skip_method = RD_RESOLVE_STEP;
rpi->pi_nstep = 2;
rpi->pi_target = 0;
if (rtld_db_version >= RD_VERSION3) {
uint_t d19;
d19 = instr[1] & S_MASK(22);
destaddr = ((int)pltaddr + 4) +
(((int)d19 << 13) >> 11);
pltbound++;
}
} else
rpi->pi_skip_method = RD_RESOLVE_NONE;
if ((rtld_db_version >= RD_VERSION3) && pltbound) {
rpi->pi_flags |= RD_FLG_PI_PLTBOUND;
rpi->pi_baddr = destaddr;
}
return (RD_OK);
}
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