/* * 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 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include "msg.h" #include "_libld.h" Word ld_init_rel(Rel_desc *reld, void *reloc) { Rela * rel = (Rela *)reloc; /* LINTED */ reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info); reld->rel_roffset = rel->r_offset; reld->rel_raddend = rel->r_addend; reld->rel_typedata = 0; reld->rel_flags |= FLG_REL_RELA; 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: * JMP *name1@GOTPCREL(%rip) * PUSHL $index * JMP .PLT0 */ static uchar_t pltn_entry[M_PLT_ENTSIZE] = { /* 0x00 jmpq *name1@GOTPCREL(%rip) */ 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, /* 0x06 pushq $index */ 0x68, 0x00, 0x00, 0x00, 0x00, /* 0x0b jmpq .plt0(%rip) */ 0xe9, 0x00, 0x00, 0x00, 0x00 /* 0x10 */ }; static uintptr_t plt_entry(Ofl_desc * ofl, Sym_desc * sdp) { uchar_t *plt0, *pltent, *gotent; Sword plt_off; Word got_off; Xword val1; Word flags = ofl->ofl_flags; Word dtflags1 = ofl->ofl_dtflags_1; got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE; plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE); plt0 = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf); pltent = plt0 + plt_off; gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off; bcopy(pltn_entry, pltent, sizeof (pltn_entry)); /* * 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; /* * patchup: * jmpq *name1@gotpcrel(%rip) * * NOTE: 0x06 represents next instruction. */ val1 = (ofl->ofl_osgot->os_shdr->sh_addr + got_off) - (ofl->ofl_osplt->os_shdr->sh_addr + plt_off) - 0x06; /* * If '-z noreloc' is specified - skip the do_reloc * stage. */ if ((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) { if (do_reloc(R_AMD64_GOTPCREL, &pltent[0x02], &val1, MSG_ORIG(MSG_SYM_PLTENT), MSG_ORIG(MSG_SPECFIL_PLTENT), ofl->ofl_lml) == 0) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL), sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name)); return (S_ERROR); } } /* * patchup: * pushq $pltndx */ val1 = (Xword)(sdp->sd_aux->sa_PLTndx - 1); /* * If '-z noreloc' is specified - skip the do_reloc * stage. */ if ((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) { if (do_reloc(R_AMD64_32, &pltent[0x07], &val1, MSG_ORIG(MSG_SYM_PLTENT), MSG_ORIG(MSG_SPECFIL_PLTENT), ofl->ofl_lml) == 0) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL), sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name)); return (S_ERROR); } } /* * patchup: * jmpq .plt0(%rip) * NOTE: 0x10 represents next instruction. The rather complex series * of casts is necessary to sign extend an offset into a 64-bit value * while satisfying various compiler error checks. Handle with care. */ val1 = (Xword)((intptr_t)((uintptr_t)plt0 - (uintptr_t)(&pltent[0x10]))); /* * If '-z noreloc' is specified - skip the do_reloc * stage. */ if ((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) { if (do_reloc(R_AMD64_PC32, &pltent[0x0c], &val1, MSG_ORIG(MSG_SYM_PLTENT), MSG_ORIG(MSG_SPECFIL_PLTENT), ofl->ofl_lml) == 0) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL), sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name)); return (S_ERROR); } } return (1); } uintptr_t ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl) { Os_desc * relosp, * osp = 0; Word ndx; Xword roffset, value; Sxword raddend; Rela rea; char *relbits; Sym_desc * sdp, * psym = (Sym_desc *)0; int sectmoved = 0; raddend = orsp->rel_raddend; 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 then we need to adjust the * raddend field to compensate for the new position of the input section * within the new output section. */ 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, orsp->rel_raddend))) { DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym)); sectmoved = 1; if (ofl->ofl_flags & FLG_OF_RELOBJ) raddend = psym->sd_sym->st_value; else raddend = psym->sd_sym->st_value - psym->sd_isc->is_osdesc->os_shdr->sh_addr; /* LINTED */ raddend += (Off)_elf_getxoff(psym->sd_isc->is_indata); if (psym->sd_isc->is_shdr->sh_flags & SHF_ALLOC) raddend += psym->sd_isc->is_osdesc->os_shdr->sh_addr; } else { /* LINTED */ raddend += (Off)_elf_getxoff(sdp->sd_isc->is_indata); if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC) raddend += sdp->sd_isc->is_osdesc->os_shdr->sh_addr; } } value = sdp->sd_sym->st_value; if (orsp->rel_flags & FLG_REL_GOT) { /* * Note: for GOT relative relocations on amd64 * we discard the addend. It was relevant * to the reference - not to the data item * being referenced (ie: that -4 thing). */ raddend = 0; osp = ofl->ofl_osgot; roffset = 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 = (ofl->ofl_osgot->os_shdr->sh_addr) + sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE; raddend = 0; if (plt_entry(ofl, sdp) == S_ERROR) return (S_ERROR); } else if (orsp->rel_flags & FLG_REL_BSS) { /* * This must be a R_AMD64_COPY. For these set the roffset to * point to the new symbols location. */ osp = ofl->ofl_isbss->is_osdesc; roffset = value; /* * The raddend doesn't mean anything in a R_SPARC_COPY * relocation. Null it out because it can confuse people. */ raddend = 0; } 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_AMD64_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; /* * Add the symbols 'value' to the addend field. */ if (orsp->rel_flags & FLG_REL_ADVAL) raddend += value; /* * The addend field for R_AMD64_DTPMOD64 means nothing. The addend * is propagated in the corresponding R_AMD64_DTPOFF64 relocation. */ if (orsp->rel_rtype == R_AMD64_DTPMOD64) raddend = 0; relbits = (char *)relosp->os_outdata->d_buf; rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype); rea.r_offset = roffset; rea.r_addend = raddend; DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &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 (Rela)); relosp->os_szoutrels += (Xword)sizeof (Rela); /* * 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_AMD64_JUMP_SLOT) actually * result in modifications to the .got. */ if (orsp->rel_rtype == R_AMD64_JUMP_SLOT) osp = ofl->ofl_osgot; ld_reloc_remain_entry(orsp, osp, ofl); return (1); } /* * amd64 Instructions for TLS processing */ static uchar_t tlsinstr_gd_ie[] = { /* * 0x00 movq %fs:0, %rax */ 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00, /* * 0x09 addq x@gottpoff(%rip), %rax */ 0x48, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00 }; static uchar_t tlsinstr_gd_le[] = { /* * 0x00 movq %fs:0, %rax */ 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00, /* * 0x09 leaq x@gottpoff(%rip), %rax */ 0x48, 0x8d, 0x80, 0x00, 0x00, 0x00, 0x00 }; static uchar_t tlsinstr_ld_le[] = { /* * .byte 0x66 */ 0x66, /* * .byte 0x66 */ 0x66, /* * .byte 0x66 */ 0x66, /* * movq %fs:0, %rax */ 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00 }; static Fixupret tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) { Sym_desc *sdp = arsp->rel_sym; Word rtype = arsp->rel_rtype; uchar_t *offset; 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_AMD64_TLSGD: /* * GD -> IE * * Transition: * 0x00 .byte 0x66 * 0x01 leaq x@tlsgd(%rip), %rdi * 0x08 .word 0x6666 * 0x0a rex64 * 0x0b call __tls_get_addr@plt * 0x10 * To: * 0x00 movq %fs:0, %rax * 0x09 addq x@gottpoff(%rip), %rax * 0x10 */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, rtype, R_AMD64_GOTTPOFF, arsp->rel_roffset, sdp->sd_name)); arsp->rel_rtype = R_AMD64_GOTTPOFF; arsp->rel_roffset += 8; arsp->rel_raddend = (Sxword)-4; /* * Addjust 'offset' to beginning of instruction * sequence. */ offset -= 4; (void) memcpy(offset, tlsinstr_gd_ie, sizeof (tlsinstr_gd_ie)); return (FIX_RELOC); case R_AMD64_PLT32: /* * Fixup done via the TLS_GD relocation */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, rtype, R_AMD64_NONE, arsp->rel_roffset, sdp->sd_name)); return (FIX_DONE); } } /* * LE reference model */ switch (rtype) { case R_AMD64_TLSGD: /* * GD -> LE * * Transition: * 0x00 .byte 0x66 * 0x01 leaq x@tlsgd(%rip), %rdi * 0x08 .word 0x6666 * 0x0a rex64 * 0x0b call __tls_get_addr@plt * 0x10 * To: * 0x00 movq %fs:0, %rax * 0x09 leaq x@tpoff(%rax), %rax * 0x10 */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, rtype, R_AMD64_TPOFF32, arsp->rel_roffset, sdp->sd_name)); arsp->rel_rtype = R_AMD64_TPOFF32; arsp->rel_roffset += 8; arsp->rel_raddend = 0; /* * Addjust 'offset' to beginning of instruction * sequence. */ offset -= 4; (void) memcpy(offset, tlsinstr_gd_le, sizeof (tlsinstr_gd_le)); return (FIX_RELOC); case R_AMD64_GOTTPOFF: /* * IE -> LE * * Transition: * 0x00 movq %fs:0, %rax * 0x09 addq x@gottopoff(%rip), %rax * 0x10 * To: * 0x00 movq %fs:0, %rax * 0x09 leaq x@tpoff(%rax), %rax * 0x10 */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, rtype, R_AMD64_TPOFF32, arsp->rel_roffset, sdp->sd_name)); arsp->rel_rtype = R_AMD64_TPOFF32; arsp->rel_raddend = 0; /* * Addjust 'offset' to beginning of instruction * sequence. */ offset -= 12; /* * Same code sequence used in the GD -> LE * transition. */ (void) memcpy(offset, tlsinstr_gd_le, sizeof (tlsinstr_gd_le)); return (FIX_RELOC); case R_AMD64_TLSLD: /* * LD -> LE * * Transition * 0x00 leaq x1@tlsgd(%rip), %rdi * 0x07 call __tls_get_addr@plt * 0x0c * To: * 0x00 .byte 0x66 * 0x01 .byte 0x66 * 0x02 .byte 0x66 * 0x03 movq %fs:0, %rax */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, rtype, R_AMD64_NONE, arsp->rel_roffset, sdp->sd_name)); offset -= 3; (void) memcpy(offset, tlsinstr_ld_le, sizeof (tlsinstr_ld_le)); return (FIX_DONE); case R_AMD64_DTPOFF32: /* * LD->LE * * Transition: * 0x00 leaq x1@dtpoff(%rax), %rcx * To: * 0x00 leaq x1@tpoff(%rax), %rcx */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, rtype, R_AMD64_TPOFF32, arsp->rel_roffset, sdp->sd_name)); arsp->rel_rtype = R_AMD64_TPOFF32; arsp->rel_raddend = 0; return (FIX_RELOC); } 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; Word dtflags1 = ofl->ofl_dtflags_1; 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) || (arsp->rel_flags & FLG_REL_GOTCL)) 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 { /* * 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); } /* * Add relocations addend to value. Add extra * relocation addend if needed. * * Note: for GOT relative relocations on amd64 * we discard the addend. It was relevant * to the reference - not to the data item * being referenced (ie: that -4 thing). */ if ((arsp->rel_flags & FLG_REL_GOT) == 0) value += arsp->rel_raddend; /* * 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, arsp); assert(gnp); if (arsp->rel_rtype == R_AMD64_DTPOFF64) 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_RELA, arsp->rel_rtype, R1addr, value, arsp->rel_sname, arsp->rel_osdesc)); /* * And do it. */ *(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_GOTPCREL(arsp->rel_rtype) && ((flags & FLG_OF_RELOBJ) == 0)) { Gotndx *gnp; /* * Calculation: * G + GOT + A - P */ gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, arsp); assert(gnp); value = (Xword)(ofl->ofl_osgot->os_shdr-> sh_addr) + ((Xword)gnp->gn_gotndx * M_GOT_ENTSIZE) + arsp->rel_raddend - refaddr; } else if (IS_GOT_PC(arsp->rel_rtype) && ((flags & FLG_OF_RELOBJ) == 0)) { value = (Xword)(ofl->ofl_osgot->os_shdr-> sh_addr) - refaddr + arsp->rel_raddend; } 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, arsp); assert(gnp); value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && ((flags & FLG_OF_RELOBJ) == 0)) { Gotndx *gnp; gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, arsp); 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_AMD64_TPOFF32) 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) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_EMPTYSEC), conv_reloc_amd64_type(arsp->rel_rtype, 0), 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_RELA, 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)) { 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_amd64_type(arsp->rel_rtype, 0), 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 '-z noreloc' is specified - skip the do_reloc * stage. */ if ((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) { if (do_reloc((uchar_t)arsp->rel_rtype, addr, &value, arsp->rel_sname, ifl_name, ofl->ofl_lml) == 0) return_code = S_ERROR; } } } return (return_code); } 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 (Rela); else if (flags & FLG_REL_PLT) ofl->ofl_relocpltsz += (Xword)sizeof (Rela); else if (flags & FLG_REL_BSS) ofl->ofl_relocbsssz += (Xword)sizeof (Rela); else if (flags & FLG_REL_NOINFO) ofl->ofl_relocrelsz += (Xword)sizeof (Rela); else orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rela); 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_RELA, M_MACH, orsp)); return (1); } /* * Stub routine since register symbols are not supported on amd64. */ /* 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; Word ortype = rsp->rel_rtype; /* * if ((shared object) and (not pc relative relocation) and * (not against ABS symbol)) * then * build R_AMD64_RELATIVE * fi */ if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && !(IS_PC_RELATIVE(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))) { /* * R_AMD64_RELATIVE updates a 64bit address, if this * relocation isn't a 64bit binding then we can not * simplify it to a RELATIVE relocation. */ if (reloc_table[ortype].re_fsize != sizeof (Addr)) { return (ld_add_outrel(NULL, rsp, ofl)); } rsp->rel_rtype = R_AMD64_RELATIVE; if (ld_add_outrel(FLG_REL_ADVAL, rsp, ofl) == S_ERROR) return (S_ERROR); rsp->rel_rtype = ortype; return (1); } /* * 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)))) { /* * 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); (void) eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), conv_reloc_amd64_type(rsp->rel_rtype, 0), 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 amd64. */ 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, rsp)) == 0) { if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSIE, FLG_REL_STLS, rtype, R_AMD64_TPOFF64, 0) == S_ERROR) return (S_ERROR); } /* * IE access model. */ if (IS_TLS_IE(rtype)) return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); /* * 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)) 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, rsp)) == 0)) { if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, FLG_REL_MTLS, rtype, R_AMD64_DTPMOD64, 0) == S_ERROR) return (S_ERROR); } else if (IS_TLS_GD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, ofl, rsp)) == 0)) { if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, FLG_REL_DTLS, rtype, R_AMD64_DTPMOD64, R_AMD64_DTPOFF64) == S_ERROR) return (S_ERROR); } 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; assert(rdesc != 0); if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) return (ofl->ofl_tlsldgotndx); for (LIST_TRAVERSE(lst, lnp, gnp)) { if ((rdesc->rel_raddend == gnp->gn_addend) && (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, rdesc); assert(gnp); gotndx = (Xword)gnp->gn_gotndx; if ((rdesc->rel_flags & FLG_REL_DTLS) && (rdesc->rel_rtype == R_AMD64_DTPOFF64)) gotndx++; return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); } /* ARGSUSED5 */ uintptr_t ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, Rel_desc * rsp, Sym_desc * sdp) { Xword raddend; Gotndx *gnp, *_gnp; Listnode *lnp, *plnp; uint_t gotents; raddend = rsp->rel_raddend; if (pgnp && (pgnp->gn_addend == raddend) && (pgnp->gn_gotref == gref)) return (1); if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) gotents = 2; else gotents = 1; plnp = 0; for (LIST_TRAVERSE(lst, lnp, _gnp)) { if (_gnp->gn_addend > raddend) break; plnp = lnp; } /* * Allocate a new entry. */ if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) return (S_ERROR); gnp->gn_addend = raddend; 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 (plnp == 0) { /* * Insert at head of list */ if (list_prependc(lst, (void *)gnp) == 0) return (S_ERROR); } else if (_gnp->gn_addend > raddend) { /* * Insert in middle of lest */ if (list_insertc(lst, (void *)gnp, plnp) == 0) return (S_ERROR); } else { /* * Append to tail of list */ 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; } static uchar_t plt0_template[M_PLT_ENTSIZE] = { /* 0x00 PUSHQ GOT+8(%rip) */ 0xff, 0x35, 0x00, 0x00, 0x00, 0x00, /* 0x06 JMP *GOT+16(%rip) */ 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, /* 0x0c NOP */ 0x90, /* 0x0d NOP */ 0x90, /* 0x0e NOP */ 0x90, /* 0x0f NOP */ 0x90 }; /* * Initializes .got[0] with the _DYNAMIC symbol value. */ uintptr_t ld_fillin_gotplt(Ofl_desc *ofl) { Word flags = ofl->ofl_flags; Word dtflags1 = ofl->ofl_dtflags_1; 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 */ *(Xword *)genptr = sdp->sd_sym->st_value; } } /* * Fill in the reserved slot in the procedure linkage table the first * entry is: * 0x00 PUSHQ GOT+8(%rip) # GOT[1] * 0x06 JMP *GOT+16(%rip) # GOT[2] * 0x0c NOP * 0x0d NOP * 0x0e NOP * 0x0f NOP */ if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { uchar_t *pltent; Xword val1; pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; bcopy(plt0_template, pltent, sizeof (plt0_template)); /* * filin: * PUSHQ GOT + 8(%rip) * * Note: 0x06 below represents the offset to the * next instruction - which is what %rip will * be pointing at. */ val1 = (ofl->ofl_osgot->os_shdr->sh_addr) + (M_GOT_XLINKMAP * M_GOT_ENTSIZE) - ofl->ofl_osplt->os_shdr->sh_addr - 0x06; /* * If '-z noreloc' is specified - skip the do_reloc * stage. */ if ((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) { if (do_reloc(R_AMD64_GOTPCREL, &pltent[0x02], &val1, MSG_ORIG(MSG_SYM_PLTENT), MSG_ORIG(MSG_SPECFIL_PLTENT), ofl->ofl_lml) == 0) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL)); return (S_ERROR); } } /* * filin: * JMP *GOT+16(%rip) */ val1 = (ofl->ofl_osgot->os_shdr->sh_addr) + (M_GOT_XRTLD * M_GOT_ENTSIZE) - ofl->ofl_osplt->os_shdr->sh_addr - 0x0c; /* * If '-z noreloc' is specified - skip the do_reloc * stage. */ if ((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) { if (do_reloc(R_AMD64_GOTPCREL, &pltent[0x08], &val1, MSG_ORIG(MSG_SYM_PLTENT), MSG_ORIG(MSG_SPECFIL_PLTENT), ofl->ofl_lml) == 0) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL)); return (S_ERROR); } } } return (1); }