machrel.intel.c revision cce0e03bb2d07f0fe27cabb93acae9c23655859f
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 (c) 1990, 1991 UNIX System Laboratories, Inc.
* Copyright (c) 1988 AT&T
* All Rights Reserved
*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <string.h>
#include <stdio.h>
#include <sys/elf_386.h>
#include <debug.h>
#include <reloc.h>
#include "msg.h"
#include "_libld.h"
Word
ld_init_rel(Rel_desc *reld, void *reloc)
{
Rel * rel = (Rel *)reloc;
/* LINTED */
reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info);
reld->rel_roffset = rel->r_offset;
reld->rel_raddend = 0;
reld->rel_typedata = 0;
return ((Word)ELF_R_SYM(rel->r_info));
}
void
ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl)
{
ofl->ofl_dehdr->e_flags |= ehdr->e_flags;
}
void
ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt)
{
if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) {
/*
* Create this entry if we are going to create a PLT table.
*/
if (ofl->ofl_pltcnt)
(*cnt)++; /* DT_PLTGOT */
}
}
void
ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn)
{
if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) {
(*dyn)->d_tag = DT_PLTGOT;
if (ofl->ofl_osgot)
(*dyn)->d_un.d_ptr = ofl->ofl_osgot->os_shdr->sh_addr;
else
(*dyn)->d_un.d_ptr = 0;
(*dyn)++;
}
}
Xword
ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl)
{
Xword value;
value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) +
M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE);
return (value);
}
/*
* Build a single plt entry - code is:
* if (building a.out)
* JMP *got_off
* else
* JMP *got_off@GOT(%ebx)
* PUSHL &rel_off
* JMP -n(%pc) # -n is pcrel offset to first plt entry
*
* The got_off@GOT entry gets filled with the address of the PUSHL,
* so the first pass through the plt jumps back here, jumping
* in turn to the first plt entry, which jumps to the dynamic
* linker. The dynamic linker then patches the GOT, rerouting
* future plt calls to the proper destination.
*/
static void
plt_entry(Ofl_desc * ofl, Word rel_off, Sym_desc * sdp)
{
uchar_t *pltent, *gotent;
Sword plt_off;
Word got_off;
got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) *
M_PLT_ENTSIZE);
pltent = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf) + plt_off;
gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off;
/*
* Fill in the got entry with the address of the next instruction.
*/
/* LINTED */
*(Word *)gotent = ofl->ofl_osplt->os_shdr->sh_addr + plt_off +
M_PLT_INSSIZE;
if (!(ofl->ofl_flags & FLG_OF_SHAROBJ)) {
pltent[0] = M_SPECIAL_INST;
pltent[1] = M_JMP_DISP_IND;
pltent += 2;
/* LINTED */
*(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->sh_addr +
got_off);
} else {
pltent[0] = M_SPECIAL_INST;
pltent[1] = M_JMP_REG_DISP_IND;
pltent += 2;
/* LINTED */
*(Word *)pltent = (Word)got_off;
}
pltent += 4;
pltent[0] = M_INST_PUSHL;
pltent++;
/* LINTED */
*(Word *)pltent = (Word)rel_off;
pltent += 4;
plt_off = -(plt_off + 16); /* JMP, PUSHL, JMP take 16 bytes */
pltent[0] = M_INST_JMP;
pltent++;
/* LINTED */
*(Word *)pltent = (Word)plt_off;
}
uintptr_t
ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl)
{
Os_desc * relosp, * osp = 0;
Word ndx, roffset, value;
Rel rea;
char *relbits;
Sym_desc * sdp, * psym = (Sym_desc *)0;
int sectmoved = 0;
sdp = orsp->rel_sym;
/*
* If the section this relocation is against has been discarded
* (-zignore), then also discard (skip) the relocation itself.
*/
if (orsp->rel_isdesc && ((orsp->rel_flags &
(FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) &&
(orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) {
DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp));
return (1);
}
/*
* If this is a relocation against a move table, or expanded move
* table, adjust the relocation entries.
*/
if (orsp->rel_move)
ld_adj_movereloc(ofl, orsp);
/*
* If this is a relocation against a section using a partial initialized
* symbol, adjust the embedded symbol info.
*
* The second argument of the am_I_partial() is the value stored at the
* target address relocation is going to be applied.
*/
if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
if (ofl->ofl_parsym.head &&
(sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
/* LINTED */
(psym = ld_am_I_partial(orsp, *(Xword *)
((uchar_t *)(orsp->rel_isdesc->is_indata->d_buf) +
orsp->rel_roffset)))) {
DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym));
sectmoved = 1;
}
}
value = sdp->sd_sym->st_value;
if (orsp->rel_flags & FLG_REL_GOT) {
osp = ofl->ofl_osgot;
roffset = (Word)ld_calc_got_offset(orsp, ofl);
} else if (orsp->rel_flags & FLG_REL_PLT) {
/*
* Note that relocations for PLT's actually
* cause a relocation againt the GOT.
*/
osp = ofl->ofl_osplt;
roffset = (Word) (ofl->ofl_osgot->os_shdr->sh_addr) +
sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
plt_entry(ofl, osp->os_relosdesc->os_szoutrels, sdp);
} else if (orsp->rel_flags & FLG_REL_BSS) {
/*
* This must be a R_386_COPY. For these set the roffset to
* point to the new symbols location.
*/
osp = ofl->ofl_isbss->is_osdesc;
roffset = (Word)value;
} else {
osp = orsp->rel_osdesc;
/*
* Calculate virtual offset of reference point; equals offset
* into section + vaddr of section for loadable sections, or
* offset plus section displacement for nonloadable sections.
*/
roffset = orsp->rel_roffset +
(Off)_elf_getxoff(orsp->rel_isdesc->is_indata);
if (!(ofl->ofl_flags & FLG_OF_RELOBJ))
roffset += orsp->rel_isdesc->is_osdesc->
os_shdr->sh_addr;
}
if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0))
relosp = ofl->ofl_osrel;
/*
* Assign the symbols index for the output relocation. If the
* relocation refers to a SECTION symbol then it's index is based upon
* the output sections symbols index. Otherwise the index can be
* derived from the symbols index itself.
*/
if (orsp->rel_rtype == R_386_RELATIVE)
ndx = STN_UNDEF;
else if ((orsp->rel_flags & FLG_REL_SCNNDX) ||
(ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) {
if (sectmoved == 0) {
/*
* Check for a null input section. This can
* occur if this relocation references a symbol
* generated by sym_add_sym().
*/
if ((sdp->sd_isc != 0) &&
(sdp->sd_isc->is_osdesc != 0))
ndx = sdp->sd_isc->is_osdesc->os_scnsymndx;
else
ndx = sdp->sd_shndx;
} else
ndx = ofl->ofl_sunwdata1ndx;
} else
ndx = sdp->sd_symndx;
/*
* If we have a replacement value for the relocation
* target, put it in place now.
*/
if (orsp->rel_flags & FLG_REL_NADDEND) {
Xword addend = orsp->rel_raddend;
uchar_t *addr;
/*
* Get the address of the data item we need to modify.
*/
addr = (uchar_t *)((uintptr_t)orsp->rel_roffset +
(uintptr_t)_elf_getxoff(orsp->rel_isdesc->is_indata));
addr += (uintptr_t)orsp->rel_osdesc->os_outdata->d_buf;
if (ld_reloc_targval_set(ofl, orsp, addr, addend) == 0)
return (S_ERROR);
}
relbits = (char *)relosp->os_outdata->d_buf;
rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype);
rea.r_offset = roffset;
DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_REL, &rea, relosp->os_name,
orsp->rel_sname));
/*
* Assert we haven't walked off the end of our relocation table.
*/
assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size);
(void) memcpy((relbits + relosp->os_szoutrels),
(char *)&rea, sizeof (Rel));
relosp->os_szoutrels += sizeof (Rel);
/*
* Determine if this relocation is against a non-writable, allocatable
* section. If so we may need to provide a text relocation diagnostic.
* Note that relocations against the .plt (R_386_JMP_SLOT) actually
* result in modifications to the .got.
*/
if (orsp->rel_rtype == R_386_JMP_SLOT)
osp = ofl->ofl_osgot;
ld_reloc_remain_entry(orsp, osp, ofl);
return (1);
}
/*
* i386 Instructions for TLS processing
*/
static uchar_t tlsinstr_gd_ie[] = {
/*
* 0x00 movl %gs:0x0, %eax
*/
0x65, 0xa1, 0x00, 0x00, 0x00, 0x00,
/*
* 0x06 addl x(%eax), %eax
* 0x0c ...
*/
0x03, 0x80, 0x00, 0x00, 0x00, 0x00
};
static uchar_t tlsinstr_gd_le[] = {
/*
* 0x00 movl %gs:0x0, %eax
*/
0x65, 0xa1, 0x00, 0x00, 0x00, 0x00,
/*
* 0x06 addl $0x0, %eax
*/
0x05, 0x00, 0x00, 0x00, 0x00,
/*
* 0x0b nop
* 0x0c
*/
0x90
};
static uchar_t tlsinstr_gd_ie_movgs[] = {
/*
* movl %gs:0x0,%eax
*/
0x65, 0xa1, 0x00, 0x00, 0x00, 00
};
#define TLS_GD_IE_MOV 0x8b /* movl opcode */
#define TLS_GD_IE_POP 0x58 /* popl + reg */
#define TLS_GD_LE_MOVL 0xb8 /* movl + reg */
#define TLS_NOP 0x90 /* NOP instruction */
#define MODRM_MSK_MOD 0xc0
#define MODRM_MSK_RO 0x38
#define MODRM_MSK_RM 0x07
#define SIB_MSK_SS 0xc0
#define SIB_MSK_IND 0x38
#define SIB_MSK_BS 0x07
static Fixupret
tls_fixups(Ofl_desc *ofl, Rel_desc *arsp)
{
Sym_desc *sdp = arsp->rel_sym;
Word rtype = arsp->rel_rtype;
uchar_t *offset, r1, r2;
offset = (uchar_t *)((uintptr_t)arsp->rel_roffset +
(uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) +
(uintptr_t)arsp->rel_osdesc->os_outdata->d_buf);
if (sdp->sd_ref == REF_DYN_NEED) {
/*
* IE reference model
*/
switch (rtype) {
case R_386_TLS_GD:
/*
* Transition:
* 0x0 leal x@tlsgd(,r1,1), %eax
* 0x7 call ___tls_get_addr
* 0xc
* To:
* 0x0 movl %gs:0, %eax
* 0x6 addl x@gotntpoff(r1), %eax
*/
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_TLS_GOTIE, arsp));
arsp->rel_rtype = R_386_TLS_GOTIE;
arsp->rel_roffset += 5;
/*
* Adjust 'offset' to beginning of instruction
* sequence.
*/
offset -= 3;
r1 = (offset[2] & SIB_MSK_IND) >> 3;
(void) memcpy(offset, tlsinstr_gd_ie,
sizeof (tlsinstr_gd_ie));
/*
* set register %r1 into the addl
* instruction.
*/
offset[0x7] |= r1;
return (FIX_RELOC);
case R_386_TLS_GD_PLT:
/*
* Fixup done via the TLS_GD relocation
*/
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_NONE, arsp));
return (FIX_DONE);
}
}
/*
* LE reference model
*/
switch (rtype) {
case R_386_TLS_GD:
/*
* Transition:
* 0x0 leal x@tlsgd(,r1,1), %eax
* 0x7 call ___tls_get_addr
* 0xc
* To:
* 0x0 movl %gs:0, %eax
* 0x6 addl $x@ntpoff, %eax
* 0xb nop
* 0xc
*/
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_TLS_LE, arsp));
arsp->rel_rtype = R_386_TLS_LE;
arsp->rel_roffset += 4;
/*
* Adjust 'offset' to beginning of instruction
* sequence.
*/
offset -= 3;
(void) memcpy(offset, tlsinstr_gd_le,
sizeof (tlsinstr_gd_le));
return (FIX_RELOC);
case R_386_TLS_GD_PLT:
case R_386_PLT32:
/*
* Fixup done via the TLS_GD relocation
*/
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_NONE, arsp));
return (FIX_DONE);
case R_386_TLS_LDM_PLT:
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_NONE, arsp));
/*
* Transition:
* call __tls_get_addr()
* to:
* nop
* nop
* nop
* nop
* nop
*/
*(offset - 1) = TLS_NOP;
*(offset) = TLS_NOP;
*(offset + 1) = TLS_NOP;
*(offset + 2) = TLS_NOP;
*(offset + 3) = TLS_NOP;
return (FIX_DONE);
case R_386_TLS_LDM:
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_NONE, arsp));
/*
* Transition:
*
* 0x00 leal x1@tlsldm(%ebx), %eax
* 0x06 call ___tls_get_addr
*
* to:
*
* 0x00 movl %gs:0, %eax
*/
(void) memcpy(offset - 2, tlsinstr_gd_ie_movgs,
sizeof (tlsinstr_gd_ie_movgs));
return (FIX_DONE);
case R_386_TLS_LDO_32:
/*
* Instructions:
*
* 0x10 leal x1@dtpoff(%eax), %edx R_386_TLS_LDO_32
* to
* 0x10 leal x1@ntpoff(%eax), %edx R_386_TLS_LE
*
*/
offset -= 2;
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_TLS_LE, arsp));
arsp->rel_rtype = R_386_TLS_LE;
return (FIX_RELOC);
case R_386_TLS_GOTIE:
/*
* These transitions are a little different than the
* others, in that we could have multiple instructions
* pointed to by a single relocation. Depending upon the
* instruction, we perform a different code transition.
*
* Here's the known transitions:
*
* 1) movl foo@gotntpoff(%reg1), %reg2
* 0x8b, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff
*
* 2) addl foo@gotntpoff(%reg1), %reg2
* 0x03, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff
*
* Transitions IE -> LE
*
* 1) movl $foo@ntpoff, %reg2
* 0xc7, 0xc0 | reg2, foo@ntpoff
*
* 2) addl $foo@ntpoff, %reg2
* 0x81, 0xc0 | reg2, foo@ntpoff
*
* Note: reg1 != 4 (%esp)
*/
DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
R_386_TLS_LE, arsp));
arsp->rel_rtype = R_386_TLS_LE;
offset -= 2;
r2 = (offset[1] & MODRM_MSK_RO) >> 3;
if (offset[0] == 0x8b) {
/* case 1 above */
offset[0] = 0xc7; /* movl */
offset[1] = 0xc0 | r2;
return (FIX_RELOC);
}
if (offset[0] == 0x03) {
/* case 2 above */
assert(offset[0] == 0x03);
offset[0] = 0x81; /* addl */
offset[1] = 0xc0 | r2;
return (FIX_RELOC);
}
/*
* Unexpected instruction sequence - fatal error.
*/
{
Conv_inv_buf_t inv_buf;
eprintf(ofl->ofl_lml, ERR_FATAL,
MSG_INTL(MSG_REL_BADTLSINS),
conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf),
arsp->rel_isdesc->is_file->ifl_name,
demangle(arsp->rel_sname),
arsp->rel_isdesc->is_name,
EC_OFF(arsp->rel_roffset));
}
return (FIX_ERROR);
case R_386_TLS_IE:
/*
* These transitions are a little different than the
* others, in that we could have multiple instructions
* pointed to by a single relocation. Depending upon the
* instruction, we perform a different code transition.
*
* Here's the known transitions:
* 1) movl foo@indntpoff, %eax
* 0xa1, foo@indntpoff
*
* 2) movl foo@indntpoff, %eax
* 0x8b, 0x05 | (reg << 3), foo@gotntpoff
*
* 3) addl foo@indntpoff, %eax
* 0x03, 0x05 | (reg << 3), foo@gotntpoff
*
* Transitions IE -> LE
*
* 1) movl $foo@ntpoff, %eax
* 0xb8, foo@ntpoff
*
* 2) movl $foo@ntpoff, %reg
* 0xc7, 0xc0 | reg, foo@ntpoff
*
* 3) addl $foo@ntpoff, %reg
* 0x81, 0xc0 | reg, foo@ntpoff
*/
arsp->rel_rtype = R_386_TLS_LE;
offset--;
if (offset[0] == 0xa1) {
/* case 1 above */
offset[0] = 0xb8; /* movl */
return (FIX_RELOC);
}
offset--;
if (offset[0] == 0x8b) {
/* case 2 above */
r2 = (offset[1] & MODRM_MSK_RO) >> 3;
offset[0] = 0xc7; /* movl */
offset[1] = 0xc0 | r2;
return (FIX_RELOC);
}
if (offset[0] == 0x03) {
/* case 3 above */
r2 = (offset[1] & MODRM_MSK_RO) >> 3;
offset[0] = 0x81; /* addl */
offset[1] = 0xc0 | r2;
return (FIX_RELOC);
}
/*
* Unexpected instruction sequence - fatal error.
*/
{
Conv_inv_buf_t inv_buf;
eprintf(ofl->ofl_lml, ERR_FATAL,
MSG_INTL(MSG_REL_BADTLSINS),
conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf),
arsp->rel_isdesc->is_file->ifl_name,
demangle(arsp->rel_sname),
arsp->rel_isdesc->is_name,
EC_OFF(arsp->rel_roffset));
}
return (FIX_ERROR);
}
return (FIX_RELOC);
}
uintptr_t
ld_do_activerelocs(Ofl_desc *ofl)
{
Rel_desc *arsp;
Rel_cache *rcp;
Listnode *lnp;
uintptr_t return_code = 1;
Word flags = ofl->ofl_flags;
if (ofl->ofl_actrels.head)
DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml));
/*
* Process active relocations.
*/
for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) {
/* LINTED */
for (arsp = (Rel_desc *)(rcp + 1);
arsp < rcp->rc_free; arsp++) {
uchar_t *addr;
Xword value;
Sym_desc *sdp;
const char *ifl_name;
Xword refaddr;
int moved = 0;
Gotref gref;
/*
* If the section this relocation is against has been
* discarded (-zignore), then discard (skip) the
* relocation itself.
*/
if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) &&
((arsp->rel_flags &
(FLG_REL_GOT | FLG_REL_BSS |
FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) {
DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml,
M_MACH, arsp));
continue;
}
/*
* We deteremine what the 'got reference'
* model (if required) is at this point. This
* needs to be done before tls_fixup() since
* it may 'transition' our instructions.
*
* The got table entries have already been assigned,
* and we bind to those initial entries.
*/
if (arsp->rel_flags & FLG_REL_DTLS)
gref = GOT_REF_TLSGD;
else if (arsp->rel_flags & FLG_REL_MTLS)
gref = GOT_REF_TLSLD;
else if (arsp->rel_flags & FLG_REL_STLS)
gref = GOT_REF_TLSIE;
else
gref = GOT_REF_GENERIC;
/*
* Perform any required TLS fixups.
*/
if (arsp->rel_flags & FLG_REL_TLSFIX) {
Fixupret ret;
if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR)
return (S_ERROR);
if (ret == FIX_DONE)
continue;
}
/*
* If this is a relocation against a move table, or
* expanded move table, adjust the relocation entries.
*/
if (arsp->rel_move)
ld_adj_movereloc(ofl, arsp);
sdp = arsp->rel_sym;
refaddr = arsp->rel_roffset +
(Off)_elf_getxoff(arsp->rel_isdesc->is_indata);
if (arsp->rel_flags & FLG_REL_CLVAL)
value = 0;
else if (ELF_ST_TYPE(sdp->sd_sym->st_info) ==
STT_SECTION) {
Sym_desc *sym;
/*
* The value for a symbol pointing to a SECTION
* is based off of that sections position.
*
* The second argument of the ld_am_I_partial()
* is the value stored at the target address
* relocation is going to be applied.
*/
if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
/* LINTED */
(sym = ld_am_I_partial(arsp, *(Xword *)
((uchar_t *)
arsp->rel_isdesc->is_indata->d_buf +
arsp->rel_roffset)))) {
/*
* If the symbol is moved,
* adjust the value
*/
value = sym->sd_sym->st_value;
moved = 1;
} else {
value = _elf_getxoff(
sdp->sd_isc->is_indata);
if (sdp->sd_isc->is_shdr->sh_flags &
SHF_ALLOC)
value += sdp->sd_isc->
is_osdesc->os_shdr->sh_addr;
}
if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS)
value -= ofl->ofl_tlsphdr->p_vaddr;
} else if (IS_SIZE(arsp->rel_rtype)) {
/*
* Size relocations require the symbols size.
*/
value = sdp->sd_sym->st_size;
} else {
/*
* Else the value is the symbols value.
*/
value = sdp->sd_sym->st_value;
}
/*
* Relocation against the GLOBAL_OFFSET_TABLE.
*/
if (arsp->rel_flags & FLG_REL_GOT)
arsp->rel_osdesc = ofl->ofl_osgot;
/*
* If loadable and not producing a relocatable object
* add the sections virtual address to the reference
* address.
*/
if ((arsp->rel_flags & FLG_REL_LOAD) &&
((flags & FLG_OF_RELOBJ) == 0))
refaddr += arsp->rel_isdesc->is_osdesc->
os_shdr->sh_addr;
/*
* If this entry has a PLT assigned to it, it's
* value is actually the address of the PLT (and
* not the address of the function).
*/
if (IS_PLT(arsp->rel_rtype)) {
if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx)
value = ld_calc_plt_addr(sdp, ofl);
}
/*
* Determine whether the value needs further adjustment.
* Filter through the attributes of the relocation to
* determine what adjustment is required. Note, many
* of the following cases are only applicable when a
* .got is present. As a .got is not generated when a
* relocatable object is being built, any adjustments
* that require a .got need to be skipped.
*/
if ((arsp->rel_flags & FLG_REL_GOT) &&
((flags & FLG_OF_RELOBJ) == 0)) {
Xword R1addr;
uintptr_t R2addr;
Word gotndx;
Gotndx *gnp;
/*
* Perform relocation against GOT table. Since
* this doesn't fit exactly into a relocation
* we place the appropriate byte in the GOT
* directly
*
* Calculate offset into GOT at which to apply
* the relocation.
*/
gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref,
ofl, 0);
assert(gnp);
if (arsp->rel_rtype == R_386_TLS_DTPOFF32)
gotndx = gnp->gn_gotndx + 1;
else
gotndx = gnp->gn_gotndx;
R1addr = (Xword)(gotndx * M_GOT_ENTSIZE);
/*
* Add the GOTs data's offset.
*/
R2addr = R1addr + (uintptr_t)
arsp->rel_osdesc->os_outdata->d_buf;
DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml,
ELF_DBG_LD, M_MACH, SHT_REL,
arsp->rel_rtype, R1addr, value,
arsp->rel_sname, arsp->rel_osdesc));
/*
* And do it.
*/
if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF)
*(Xword *)R2addr =
ld_byteswap_Xword(value);
else
*(Xword *)R2addr = value;
continue;
} else if (IS_GOT_BASED(arsp->rel_rtype) &&
((flags & FLG_OF_RELOBJ) == 0)) {
value -= ofl->ofl_osgot->os_shdr->sh_addr;
} else if (IS_GOT_PC(arsp->rel_rtype) &&
((flags & FLG_OF_RELOBJ) == 0)) {
value =
(Xword)(ofl->ofl_osgot->os_shdr->sh_addr) -
refaddr;
} else if ((IS_PC_RELATIVE(arsp->rel_rtype)) &&
(((flags & FLG_OF_RELOBJ) == 0) ||
(arsp->rel_osdesc == sdp->sd_isc->is_osdesc))) {
value -= refaddr;
} else if (IS_TLS_INS(arsp->rel_rtype) &&
IS_GOT_RELATIVE(arsp->rel_rtype) &&
((flags & FLG_OF_RELOBJ) == 0)) {
Gotndx *gnp;
gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref,
ofl, 0);
assert(gnp);
value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
if (arsp->rel_rtype == R_386_TLS_IE) {
value +=
ofl->ofl_osgot->os_shdr->sh_addr;
}
} else if (IS_GOT_RELATIVE(arsp->rel_rtype) &&
((flags & FLG_OF_RELOBJ) == 0)) {
Gotndx *gnp;
gnp = ld_find_gotndx(&(sdp->sd_GOTndxs),
GOT_REF_GENERIC, ofl, 0);
assert(gnp);
value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
} else if ((arsp->rel_flags & FLG_REL_STLS) &&
((flags & FLG_OF_RELOBJ) == 0)) {
Xword tlsstatsize;
/*
* This is the LE TLS reference model. Static
* offset is hard-coded.
*/
tlsstatsize =
S_ROUND(ofl->ofl_tlsphdr->p_memsz,
M_TLSSTATALIGN);
value = tlsstatsize - value;
/*
* Since this code is fixed up, it assumes a
* negative offset that can be added to the
* thread pointer.
*/
if ((arsp->rel_rtype == R_386_TLS_LDO_32) ||
(arsp->rel_rtype == R_386_TLS_LE))
value = -value;
}
if (arsp->rel_isdesc->is_file)
ifl_name = arsp->rel_isdesc->is_file->ifl_name;
else
ifl_name = MSG_INTL(MSG_STR_NULL);
/*
* Make sure we have data to relocate. Compiler and
* assembler developers have been known to generate
* relocations against invalid sections (normally .bss),
* so for their benefit give them sufficient information
* to help analyze the problem. End users should never
* see this.
*/
if (arsp->rel_isdesc->is_indata->d_buf == 0) {
Conv_inv_buf_t inv_buf;
eprintf(ofl->ofl_lml, ERR_FATAL,
MSG_INTL(MSG_REL_EMPTYSEC),
conv_reloc_386_type(arsp->rel_rtype,
0, &inv_buf),
ifl_name, demangle(arsp->rel_sname),
arsp->rel_isdesc->is_name);
return (S_ERROR);
}
/*
* Get the address of the data item we need to modify.
*/
addr = (uchar_t *)((uintptr_t)arsp->rel_roffset +
(uintptr_t)_elf_getxoff(arsp->rel_isdesc->
is_indata));
DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD,
M_MACH, SHT_REL, arsp->rel_rtype, EC_NATPTR(addr),
value, arsp->rel_sname, arsp->rel_osdesc));
addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf;
if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
ofl->ofl_size) || (arsp->rel_roffset >
arsp->rel_osdesc->os_shdr->sh_size)) {
Conv_inv_buf_t inv_buf;
int class;
if (((uintptr_t)addr -
(uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size)
class = ERR_FATAL;
else
class = ERR_WARNING;
eprintf(ofl->ofl_lml, class,
MSG_INTL(MSG_REL_INVALOFFSET),
conv_reloc_386_type(arsp->rel_rtype,
0, &inv_buf),
ifl_name, arsp->rel_isdesc->is_name,
demangle(arsp->rel_sname),
EC_ADDR((uintptr_t)addr -
(uintptr_t)ofl->ofl_nehdr));
if (class == ERR_FATAL) {
return_code = S_ERROR;
continue;
}
}
/*
* The relocation is additive. Ignore the previous
* symbol value if this local partial symbol is
* expanded.
*/
if (moved)
value -= *addr;
/*
* If we have a replacement value for the relocation
* target, put it in place now.
*/
if (arsp->rel_flags & FLG_REL_NADDEND) {
Xword addend = arsp->rel_raddend;
if (ld_reloc_targval_set(ofl, arsp,
addr, addend) == 0)
return (S_ERROR);
}
/*
* If '-z noreloc' is specified - skip the do_reloc_ld
* stage.
*/
if (OFL_DO_RELOC(ofl)) {
if (do_reloc_ld((uchar_t)arsp->rel_rtype, addr,
&value, arsp->rel_sname, ifl_name,
OFL_SWAP_RELOC_DATA(ofl, arsp),
ofl->ofl_lml) == 0)
return_code = S_ERROR;
}
}
}
return (return_code);
}
/*
* Add an output relocation record.
*/
uintptr_t
ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl)
{
Rel_desc *orsp;
Rel_cache *rcp;
Sym_desc *sdp = rsp->rel_sym;
/*
* Static executables *do not* want any relocations against them.
* Since our engine still creates relocations against a WEAK UNDEFINED
* symbol in a static executable, it's best to disable them here
* instead of through out the relocation code.
*/
if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) ==
(FLG_OF_STATIC | FLG_OF_EXEC))
return (1);
/*
* If no relocation cache structures are available allocate
* a new one and link it into the cache list.
*/
if ((ofl->ofl_outrels.tail == 0) ||
((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) ||
((orsp = rcp->rc_free) == rcp->rc_end)) {
static size_t nextsize = 0;
size_t size;
/*
* Output relocation numbers can vary considerably between
* building executables or shared objects (pic vs. non-pic),
* etc. But, they typically aren't very large, so for these
* objects use a standard bucket size. For building relocatable
* objects, typically there will be an output relocation for
* every input relocation.
*/
if (nextsize == 0) {
if (ofl->ofl_flags & FLG_OF_RELOBJ) {
if ((size = ofl->ofl_relocincnt) == 0)
size = REL_LOIDESCNO;
if (size > REL_HOIDESCNO)
nextsize = REL_HOIDESCNO;
else
nextsize = REL_LOIDESCNO;
} else
nextsize = size = REL_HOIDESCNO;
} else
size = nextsize;
size = size * sizeof (Rel_desc);
if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) ||
(list_appendc(&ofl->ofl_outrels, rcp) == 0))
return (S_ERROR);
/* LINTED */
rcp->rc_free = orsp = (Rel_desc *)(rcp + 1);
/* LINTED */
rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size);
}
/*
* If we are adding a output relocation against a section
* symbol (non-RELATIVE) then mark that section. These sections
* will be added to the .dynsym symbol table.
*/
if (sdp && (rsp->rel_rtype != M_R_RELATIVE) &&
((flags & FLG_REL_SCNNDX) ||
(ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) {
/*
* If this is a COMMON symbol - no output section
* exists yet - (it's created as part of sym_validate()).
* So - we mark here that when it's created it should
* be tagged with the FLG_OS_OUTREL flag.
*/
if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
(sdp->sd_sym->st_shndx == SHN_COMMON)) {
if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS)
ofl->ofl_flags1 |= FLG_OF1_BSSOREL;
else
ofl->ofl_flags1 |= FLG_OF1_TLSOREL;
} else {
Os_desc *osp = sdp->sd_isc->is_osdesc;
if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) {
ofl->ofl_dynshdrcnt++;
osp->os_flags |= FLG_OS_OUTREL;
}
}
}
*orsp = *rsp;
orsp->rel_flags |= flags;
rcp->rc_free++;
ofl->ofl_outrelscnt++;
if (flags & FLG_REL_GOT)
ofl->ofl_relocgotsz += (Xword)sizeof (Rel);
else if (flags & FLG_REL_PLT)
ofl->ofl_relocpltsz += (Xword)sizeof (Rel);
else if (flags & FLG_REL_BSS)
ofl->ofl_relocbsssz += (Xword)sizeof (Rel);
else if (flags & FLG_REL_NOINFO)
ofl->ofl_relocrelsz += (Xword)sizeof (Rel);
else
orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rel);
if (orsp->rel_rtype == M_R_RELATIVE)
ofl->ofl_relocrelcnt++;
/*
* We don't perform sorting on PLT relocations because
* they have already been assigned a PLT index and if we
* were to sort them we would have to re-assign the plt indexes.
*/
if (!(flags & FLG_REL_PLT))
ofl->ofl_reloccnt++;
/*
* Insure a GLOBAL_OFFSET_TABLE is generated if required.
*/
if (IS_GOT_REQUIRED(orsp->rel_rtype))
ofl->ofl_flags |= FLG_OF_BLDGOT;
/*
* Identify and possibly warn of a displacement relocation.
*/
if (orsp->rel_flags & FLG_REL_DISP) {
ofl->ofl_dtflags_1 |= DF_1_DISPRELPND;
if (ofl->ofl_flags & FLG_OF_VERBOSE)
ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl);
}
DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL,
M_MACH, orsp));
return (1);
}
/*
* Stub routine since register symbols are not supported on i386.
*/
/* ARGSUSED */
uintptr_t
ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl)
{
eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_NOREG));
return (S_ERROR);
}
/*
* process relocation for a LOCAL symbol
*/
uintptr_t
ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl)
{
Word flags = ofl->ofl_flags;
Sym_desc *sdp = rsp->rel_sym;
Word shndx = sdp->sd_sym->st_shndx;
/*
* if ((shared object) and (not pc relative relocation) and
* (not against ABS symbol))
* then
* build R_386_RELATIVE
* fi
*/
if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) &&
!(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) &&
!(IS_GOT_BASED(rsp->rel_rtype)) &&
!(rsp->rel_isdesc != NULL &&
(rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) &&
(((sdp->sd_flags & FLG_SY_SPECSEC) == 0) ||
(shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) {
Word ortype = rsp->rel_rtype;
rsp->rel_rtype = R_386_RELATIVE;
if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR)
return (S_ERROR);
rsp->rel_rtype = ortype;
}
/*
* If the relocation is against a 'non-allocatable' section
* and we can not resolve it now - then give a warning
* message.
*
* We can not resolve the symbol if either:
* a) it's undefined
* b) it's defined in a shared library and a
* COPY relocation hasn't moved it to the executable
*
* Note: because we process all of the relocations against the
* text segment before any others - we know whether
* or not a copy relocation will be generated before
* we get here (see reloc_init()->reloc_segments()).
*/
if (!(rsp->rel_flags & FLG_REL_LOAD) &&
((shndx == SHN_UNDEF) ||
((sdp->sd_ref == REF_DYN_NEED) &&
((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) {
Conv_inv_buf_t inv_buf;
/*
* If the relocation is against a SHT_SUNW_ANNOTATE
* section - then silently ignore that the relocation
* can not be resolved.
*/
if (rsp->rel_osdesc &&
(rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE))
return (0);
eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM),
conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf),
rsp->rel_isdesc->is_file->ifl_name,
demangle(rsp->rel_sname), rsp->rel_osdesc->os_name);
return (1);
}
/*
* Perform relocation.
*/
return (ld_add_actrel(NULL, rsp, ofl));
}
uintptr_t
/* ARGSUSED */
ld_reloc_GOTOP(Boolean local, Rel_desc * rsp, Ofl_desc * ofl)
{
/*
* Stub routine for common code compatibility, we shouldn't
* actually get here on x86.
*/
assert(0);
return (S_ERROR);
}
uintptr_t
ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl)
{
Word rtype = rsp->rel_rtype;
Sym_desc *sdp = rsp->rel_sym;
Word flags = ofl->ofl_flags;
Gotndx *gnp;
/*
* If we're building an executable - use either the IE or LE access
* model. If we're building a shared object process any IE model.
*/
if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) {
/*
* Set the DF_STATIC_TLS flag.
*/
ofl->ofl_dtflags |= DF_STATIC_TLS;
if (!local || ((flags & FLG_OF_EXEC) == 0)) {
/*
* Assign a GOT entry for static TLS references.
*/
if ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs),
GOT_REF_TLSIE, ofl, 0)) == 0) {
if (ld_assign_got_TLS(local, rsp, ofl, sdp,
gnp, GOT_REF_TLSIE, FLG_REL_STLS,
rtype, R_386_TLS_TPOFF, 0) == S_ERROR)
return (S_ERROR);
}
/*
* IE access model.
*/
if (IS_TLS_IE(rtype)) {
if (ld_add_actrel(FLG_REL_STLS,
rsp, ofl) == S_ERROR)
return (S_ERROR);
/*
* A non-pic shared object needs to adjust the
* active relocation (indntpoff).
*/
if (((flags & FLG_OF_EXEC) == 0) &&
(rtype == R_386_TLS_IE)) {
rsp->rel_rtype = R_386_RELATIVE;
return (ld_add_outrel(NULL, rsp, ofl));
}
return (1);
}
/*
* Fixups are required for other executable models.
*/
return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
rsp, ofl));
}
/*
* LE access model.
*/
if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32))
return (ld_add_actrel(FLG_REL_STLS, rsp, ofl));
return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
rsp, ofl));
}
/*
* Building a shared object.
*
* Assign a GOT entry for a dynamic TLS reference.
*/
if (IS_TLS_LD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs),
GOT_REF_TLSLD, ofl, 0)) == 0)) {
if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD,
FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, 0) == S_ERROR)
return (S_ERROR);
} else if (IS_TLS_GD(rtype) &&
((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD,
ofl, 0)) == 0)) {
if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD,
FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32,
R_386_TLS_DTPOFF32) == S_ERROR)
return (S_ERROR);
}
/*
* For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually
* cause a call to __tls_get_addr(). Convert this relocation to that
* symbol now, and prepare for the PLT magic.
*/
if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) {
Sym_desc *tlsgetsym;
if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU),
ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR)
return (S_ERROR);
rsp->rel_sym = tlsgetsym;
rsp->rel_sname = tlsgetsym->sd_name;
rsp->rel_rtype = R_386_PLT32;
if (ld_reloc_plt(rsp, ofl) == S_ERROR)
return (S_ERROR);
rsp->rel_sym = sdp;
rsp->rel_sname = sdp->sd_name;
rsp->rel_rtype = rtype;
return (1);
}
if (IS_TLS_LD(rtype))
return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl));
return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl));
}
/* ARGSUSED3 */
Gotndx *
ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc)
{
Listnode * lnp;
Gotndx * gnp;
if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx)
return (ofl->ofl_tlsldgotndx);
for (LIST_TRAVERSE(lst, lnp, gnp)) {
if (gnp->gn_gotref == gref)
return (gnp);
}
return ((Gotndx *)0);
}
Xword
ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl)
{
Os_desc *osp = ofl->ofl_osgot;
Sym_desc *sdp = rdesc->rel_sym;
Xword gotndx;
Gotref gref;
Gotndx *gnp;
if (rdesc->rel_flags & FLG_REL_DTLS)
gref = GOT_REF_TLSGD;
else if (rdesc->rel_flags & FLG_REL_MTLS)
gref = GOT_REF_TLSLD;
else if (rdesc->rel_flags & FLG_REL_STLS)
gref = GOT_REF_TLSIE;
else
gref = GOT_REF_GENERIC;
gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, 0);
assert(gnp);
gotndx = (Xword)gnp->gn_gotndx;
if ((rdesc->rel_flags & FLG_REL_DTLS) &&
(rdesc->rel_rtype == R_386_TLS_DTPOFF32))
gotndx++;
return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE)));
}
/* ARGSUSED4 */
uintptr_t
ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl,
Rel_desc * rsp, Sym_desc * sdp)
{
Gotndx *gnp;
uint_t gotents;
if (pgnp)
return (1);
if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD))
gotents = 2;
else
gotents = 1;
if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0)
return (S_ERROR);
gnp->gn_gotndx = ofl->ofl_gotcnt;
gnp->gn_gotref = gref;
ofl->ofl_gotcnt += gotents;
if (gref == GOT_REF_TLSLD) {
ofl->ofl_tlsldgotndx = gnp;
return (1);
}
if (list_appendc(lst, (void *)gnp) == 0)
return (S_ERROR);
return (1);
}
void
ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl)
{
sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++;
sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++;
ofl->ofl_flags |= FLG_OF_BLDGOT;
}
/*
* Initializes .got[0] with the _DYNAMIC symbol value.
*/
uintptr_t
ld_fillin_gotplt(Ofl_desc *ofl)
{
Word flags = ofl->ofl_flags;
if (ofl->ofl_osgot) {
Sym_desc *sdp;
if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U),
SYM_NOHASH, 0, ofl)) != NULL) {
uchar_t *genptr;
genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf +
(M_GOT_XDYNAMIC * M_GOT_ENTSIZE));
/* LINTED */
*(Word *)genptr = (Word)sdp->sd_sym->st_value;
}
}
/*
* Fill in the reserved slot in the procedure linkage table the first
* entry is:
* if (building a.out) {
* PUSHL got[1] # the address of the link map entry
* JMP * got[2] # the address of rtbinder
* } else {
* PUSHL got[1]@GOT(%ebx) # the address of the link map entry
* JMP * got[2]@GOT(%ebx) # the address of rtbinder
* }
*/
if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) {
uchar_t *pltent;
pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf;
if (!(flags & FLG_OF_SHAROBJ)) {
pltent[0] = M_SPECIAL_INST;
pltent[1] = M_PUSHL_DISP;
pltent += 2;
/* LINTED */
*(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->
sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE);
pltent += 4;
pltent[0] = M_SPECIAL_INST;
pltent[1] = M_JMP_DISP_IND;
pltent += 2;
/* LINTED */
*(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->
sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE);
} else {
pltent[0] = M_SPECIAL_INST;
pltent[1] = M_PUSHL_REG_DISP;
pltent += 2;
/* LINTED */
*(Word *)pltent = (Word)(M_GOT_XLINKMAP *
M_GOT_ENTSIZE);
pltent += 4;
pltent[0] = M_SPECIAL_INST;
pltent[1] = M_JMP_REG_DISP_IND;
pltent += 2;
/* LINTED */
*(Word *)pltent = (Word)(M_GOT_XRTLD *
M_GOT_ENTSIZE);
}
}
return (1);
}