/* * 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) 2004, 2010, Oracle and/or its affiliates. All rights reserved. */ /* Get the x86 version of the relocation engine */ #define DO_RELOC_LIBLD_X86 #include #include #include #include #include #include #include #include "msg.h" #include "_libld.h" /* * This module uses do_reloc_ld() to execute several synthesized relocations. * That function expects to be passed two things that we need to construct * here: * * 1) A Rel_desc descriptor for each relocation type, from which the * rel_rtype field, and nothing else, is obtained. This is easily * handled by constructing the necessary descriptors. * * 2) A function, which called with the Rel_desc descriptor, returns * a string representing the name of the symbol associated with * the descriptor. The usual function for this is ld_reloc_sym_name(). * However, that function will not work in this case, as these synthetic * relocations do not have an associated symbol. We supply the * syn_rdesc_sym_name() function to simply return the fixed name. */ static Rel_desc rdesc_r_amd64_gotpcrel = { NULL, NULL, NULL, 0, 0, 0, R_AMD64_GOTPCREL }; static Rel_desc rdesc_r_amd64_32 = { NULL, NULL, NULL, 0, 0, 0, R_AMD64_32 }; static Rel_desc rdesc_r_amd64_pc32 = { NULL, NULL, NULL, 0, 0, 0, R_AMD64_PC32 }; /*ARGSUSED*/ static const char * syn_rdesc_sym_name(Rel_desc *rdesc) { return (MSG_ORIG(MSG_SYM_PLTENT)); } /* * Search the GOT index list for a GOT entry with a matching reference and the * proper addend. */ static Gotndx * ld_find_got_ndx(Alist *alp, Gotref gref, Ofl_desc *ofl, Rel_desc *rdesc) { Aliste idx; Gotndx *gnp; assert(rdesc != 0); if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) return (ofl->ofl_tlsldgotndx); for (ALIST_TRAVERSE(alp, idx, gnp)) { if ((rdesc->rel_raddend == gnp->gn_addend) && (gnp->gn_gotref == gref)) { return (gnp); } } return (NULL); } static 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_got_ndx(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))); } static Word ld_init_rel(Rel_desc *reld, Word *typedata, void *reloc) { Rela *rel = (Rela *)reloc; /* LINTED */ reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info, M_MACH); reld->rel_roffset = rel->r_offset; reld->rel_raddend = rel->r_addend; *typedata = 0; reld->rel_flags |= FLG_REL_RELA; return ((Word)ELF_R_SYM(rel->r_info)); } static void ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl) { ofl->ofl_dehdr->e_flags |= ehdr->e_flags; } static 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 */ } } static 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)++; } } static 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; int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 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; if (bswap) /* LINTED */ *(Word *)gotent = ld_bswap_Word(*(Word *)gotent); /* * If '-z noreloc' is specified - skip the do_reloc_ld * stage. */ if (!OFL_DO_RELOC(ofl)) return (1); /* * 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 (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x02], &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap, ofl->ofl_lml) == 0) { ld_eprintf(ofl, 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 (do_reloc_ld(&rdesc_r_amd64_32, &pltent[0x07], &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap, ofl->ofl_lml) == 0) { ld_eprintf(ofl, 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 (do_reloc_ld(&rdesc_r_amd64_pc32, &pltent[0x0c], &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap, ofl->ofl_lml) == 0) { ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL), sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name)); return (S_ERROR); } return (1); } static uintptr_t ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl, Boolean *remain_seen) { 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 (RELAUX_GET_MOVE(orsp)) 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_parsyms && (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 = RELAUX_GET_OSDESC(orsp); /* * 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 && sdp->sd_isc->is_osdesc) ndx = sdp->sd_isc->is_osdesc->os_identndx; else ndx = sdp->sd_shndx; } else ndx = ofl->ofl_parexpnndx; } 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, ld_reloc_sym_name(orsp))); /* * 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, remain_seen); 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 }; #define REX_B 0x1 #define REX_X 0x2 #define REX_R 0x4 #define REX_W 0x8 #define REX_PREFIX 0x40 #define REX_RW (REX_PREFIX | REX_R | REX_W) #define REX_BW (REX_PREFIX | REX_B | REX_W) #define REX_BRW (REX_PREFIX | REX_B | REX_R | REX_W) #define REG_ESP 0x4 #define INSN_ADDMR 0x03 /* addq mem,reg */ #define INSN_ADDIR 0x81 /* addq imm,reg */ #define INSN_MOVMR 0x8b /* movq mem,reg */ #define INSN_MOVIR 0xc7 /* movq imm,reg */ #define INSN_LEA 0x8d /* leaq mem,reg */ 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)RELAUX_GET_OSDESC(arsp)->os_outdata->d_buf); /* * Note that in certain of the original insn sequences below, the * instructions are not necessarily adjacent */ 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, R_AMD64_GOTTPOFF, arsp, ld_reloc_sym_name)); arsp->rel_rtype = R_AMD64_GOTTPOFF; arsp->rel_roffset += 8; arsp->rel_raddend = (Sxword)-4; /* * Adjust '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, R_AMD64_NONE, arsp, ld_reloc_sym_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, R_AMD64_TPOFF32, arsp, ld_reloc_sym_name)); arsp->rel_rtype = R_AMD64_TPOFF32; arsp->rel_roffset += 8; arsp->rel_raddend = 0; /* * Adjust '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 1: * movq %fs:0, %reg * addq x@gottpoff(%rip), %reg * To: * movq %fs:0, %reg * leaq x@tpoff(%reg), %reg * * Transition (as a special case): * movq %fs:0, %r12/%rsp * addq x@gottpoff(%rip), %r12/%rsp * To: * movq %fs:0, %r12/%rsp * addq x@tpoff(%rax), %r12/%rsp * * Transition 2: * movq x@gottpoff(%rip), %reg * movq %fs:(%reg), %reg * To: * movq x@tpoff(%reg), %reg * movq %fs:(%reg), %reg */ Conv_inv_buf_t inv_buf; uint8_t reg; /* Register */ offset -= 3; reg = offset[2] >> 3; /* Encoded dest. reg. operand */ DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, R_AMD64_TPOFF32, arsp, ld_reloc_sym_name)); arsp->rel_rtype = R_AMD64_TPOFF32; arsp->rel_raddend = 0; /* * This is transition 2, and the special case of form 1 where * a normal transition would index %rsp or %r12 and need a SIB * byte in the leaq for which we lack space */ if ((offset[1] == INSN_MOVMR) || ((offset[1] == INSN_ADDMR) && (reg == REG_ESP))) { /* * If we needed an extra bit of MOD.reg to refer to * this register as the dest of the original movq we * need an extra bit of MOD.rm to refer to it in the * dest of the replacement movq or addq. */ if (offset[0] == REX_RW) offset[0] = REX_BW; offset[1] = (offset[1] == INSN_MOVMR) ? INSN_MOVIR : INSN_ADDIR; offset[2] = 0xc0 | reg; return (FIX_RELOC); } else if (offset[1] == INSN_ADDMR) { /* * If we needed an extra bit of MOD.reg to refer to * this register in the dest of the addq we need an * extra bit of both MOD.reg and MOD.rm to refer to it * in the source and dest of the leaq */ if (offset[0] == REX_RW) offset[0] = REX_BRW; offset[1] = INSN_LEA; offset[2] = 0x80 | (reg << 3) | reg; return (FIX_RELOC); } ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf), arsp->rel_isdesc->is_file->ifl_name, ld_reloc_sym_name(arsp), arsp->rel_isdesc->is_name, EC_OFF(arsp->rel_roffset)); return (FIX_ERROR); } 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, R_AMD64_NONE, arsp, ld_reloc_sym_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, R_AMD64_TPOFF32, arsp, ld_reloc_sym_name)); arsp->rel_rtype = R_AMD64_TPOFF32; arsp->rel_raddend = 0; return (FIX_RELOC); } return (FIX_RELOC); } static uintptr_t ld_do_activerelocs(Ofl_desc *ofl) { Rel_desc *arsp; Rel_cachebuf *rcbp; Aliste idx; uintptr_t return_code = 1; ofl_flag_t flags = ofl->ofl_flags; if (aplist_nitems(ofl->ofl_actrels.rc_list) != 0) DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); /* * Process active relocations. */ REL_CACHE_TRAVERSE(&ofl->ofl_actrels, idx, rcbp, arsp) { uchar_t *addr; Xword value; Sym_desc *sdp; const char *ifl_name; Xword refaddr; int moved = 0; Gotref gref; Os_desc *osp; /* * 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 determine 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 (RELAUX_GET_MOVE(arsp)) 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. */ if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && /* LINTED */ (sym = ld_am_I_partial(arsp, arsp->rel_raddend))) { /* * The symbol was moved, so adjust the value * relative to the new section. */ value = sym->sd_sym->st_value; moved = 1; /* * The original raddend covers the displacement * from the section start to the desired * address. The value computed above gets us * from the section start to the start of the * symbol range. Adjust the old raddend to * remove the offset from section start to * symbol start, leaving the displacement * within the range of the symbol. */ arsp->rel_raddend -= sym->sd_osym->st_value; } 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 if ((sdp->sd_flags & FLG_SY_CAP) && sdp->sd_aux && sdp->sd_aux->sa_PLTndx) { /* * If relocation is against a capabilities symbol, we * need to jump to an associated PLT, so that at runtime * ld.so.1 is involved to determine the best binding * choice. Otherwise, the value is the symbols value. */ value = ld_calc_plt_addr(sdp, ofl); } else value = sdp->sd_sym->st_value; /* * Relocation against the GLOBAL_OFFSET_TABLE. */ if ((arsp->rel_flags & FLG_REL_GOT) && !ld_reloc_set_aux_osdesc(ofl, arsp, ofl->ofl_osgot)) return (S_ERROR); osp = RELAUX_GET_OSDESC(arsp); /* * 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, its 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_got_ndx(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)osp->os_outdata->d_buf; DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT, M_MACH, SHT_RELA, arsp, R1addr, value, ld_reloc_sym_name)); /* * And do it. */ if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) *(Xword *)R2addr = ld_bswap_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_GOTPCREL(arsp->rel_rtype) && ((flags & FLG_OF_RELOBJ) == 0)) { Gotndx *gnp; /* * Calculation: * G + GOT + A - P */ gnp = ld_find_got_ndx(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) || (osp == 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_got_ndx(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_got_ndx(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) { Conv_inv_buf_t inv_buf; ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_EMPTYSEC), conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf), ifl_name, ld_reloc_sym_name(arsp), EC_WORD(arsp->rel_isdesc->is_scnndx), 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_ACT, M_MACH, SHT_RELA, arsp, EC_NATPTR(addr), value, ld_reloc_sym_name)); addr += (uintptr_t)osp->os_outdata->d_buf; if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) || (arsp->rel_roffset > osp->os_shdr->sh_size)) { int class; Conv_inv_buf_t inv_buf; if (((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) class = ERR_FATAL; else class = ERR_WARNING; ld_eprintf(ofl, class, MSG_INTL(MSG_REL_INVALOFFSET), conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf), ifl_name, EC_WORD(arsp->rel_isdesc->is_scnndx), arsp->rel_isdesc->is_name, ld_reloc_sym_name(arsp), 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_ld stage. */ if (OFL_DO_RELOC(ofl)) { /* * If this is a PROGBITS section and the running linker * has a different byte order than the target host, * tell do_reloc_ld() to swap bytes. */ if (do_reloc_ld(arsp, addr, &value, ld_reloc_sym_name, ifl_name, OFL_SWAP_RELOC_DATA(ofl, arsp), ofl->ofl_lml) == 0) { ofl->ofl_flags |= FLG_OF_FATAL; return_code = S_ERROR; } } } return (return_code); } static uintptr_t ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) { Rel_desc *orsp; 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_IS_STATIC_EXEC(ofl)) return (1); /* * 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; Is_desc *isp = sdp->sd_isc; if (isp && ((osp = isp->is_osdesc) != NULL) && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { ofl->ofl_dynshdrcnt++; osp->os_flags |= FLG_OS_OUTREL; } } } /* Enter it into the output relocation cache */ if ((orsp = ld_reloc_enter(ofl, &ofl->ofl_outrels, rsp, flags)) == NULL) return (S_ERROR); 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 RELAUX_GET_OSDESC(orsp)->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); } /* * process relocation for a LOCAL symbol */ static uintptr_t ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) { ofl_flag_t 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_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))) { /* * 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(0, 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)))) { Conv_inv_buf_t inv_buf; Os_desc *osp = RELAUX_GET_OSDESC(rsp); /* * If the relocation is against a SHT_SUNW_ANNOTATE * section - then silently ignore that the relocation * can not be resolved. */ if (osp && (osp->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) return (0); ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), conv_reloc_amd64_type(rsp->rel_rtype, 0, &inv_buf), rsp->rel_isdesc->is_file->ifl_name, ld_reloc_sym_name(rsp), osp->os_name); return (1); } /* * Perform relocation. */ return (ld_add_actrel(NULL, rsp, ofl)); } static uintptr_t ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) { Word rtype = rsp->rel_rtype; Sym_desc *sdp = rsp->rel_sym; ofl_flag_t 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_got_ndx(sdp->sd_GOTndxs, GOT_REF_TLSIE, ofl, rsp)) == NULL) { 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_got_ndx(sdp->sd_GOTndxs, GOT_REF_TLSLD, ofl, rsp)) == NULL)) { if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, FLG_REL_MTLS, rtype, R_AMD64_DTPMOD64, NULL) == S_ERROR) return (S_ERROR); } else if (IS_TLS_GD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, GOT_REF_TLSGD, ofl, rsp)) == NULL)) { 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)); } /* ARGSUSED5 */ static uintptr_t ld_assign_got_ndx(Alist **alpp, Gotndx *pgnp, Gotref gref, Ofl_desc *ofl, Rel_desc *rsp, Sym_desc *sdp) { Xword raddend; Gotndx gn, *gnp; Aliste idx; 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; gn.gn_addend = raddend; gn.gn_gotndx = ofl->ofl_gotcnt; gn.gn_gotref = gref; ofl->ofl_gotcnt += gotents; if (gref == GOT_REF_TLSLD) { if (ofl->ofl_tlsldgotndx == NULL) { if ((gnp = libld_malloc(sizeof (Gotndx))) == NULL) return (S_ERROR); (void) memcpy(gnp, &gn, sizeof (Gotndx)); ofl->ofl_tlsldgotndx = gnp; } return (1); } idx = 0; for (ALIST_TRAVERSE(*alpp, idx, gnp)) { if (gnp->gn_addend > raddend) break; } /* * GOT indexes are maintained on an Alist, where there is typically * only one index. The usage of this list is to scan the list to find * an index, and then apply that index immediately to a relocation. * Thus there are no external references to these GOT index structures * that can be compromised by the Alist being reallocated. */ if (alist_insert(alpp, &gn, sizeof (Gotndx), AL_CNT_SDP_GOT, idx) == NULL) return (S_ERROR); return (1); } static 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. */ static uintptr_t ld_fillin_gotplt(Ofl_desc *ofl) { int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; if (ofl->ofl_osgot) { Sym_desc *sdp; if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), SYM_NOHASH, NULL, 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; if (bswap) /* LINTED */ *(Xword *)genptr = /* LINTED */ ld_bswap_Xword(*(Xword *)genptr); } } /* * 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 ((ofl->ofl_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)); /* * If '-z noreloc' is specified - skip the do_reloc_ld * stage. */ if (!OFL_DO_RELOC(ofl)) return (1); /* * 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 (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x02], &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap, ofl->ofl_lml) == 0) { ld_eprintf(ofl, 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 (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x08], &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap, ofl->ofl_lml) == 0) { ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL)); return (S_ERROR); } } return (1); } /* * Template for generating "void (*)(void)" function */ static const uchar_t nullfunc_tmpl[] = { /* amd64 */ /* 0x00 */ 0x55, /* pushq %rbp */ /* 0x01 */ 0x48, 0x8b, 0xec, /* movq %rsp,%rbp */ /* 0x04 */ 0x48, 0x8b, 0xe5, /* movq %rbp,%rsp */ /* 0x07 */ 0x5d, /* popq %rbp */ /* 0x08 */ 0xc3 /* ret */ }; /* * Function used to provide fill padding in SHF_EXECINSTR sections * * entry: * * base - base address of section being filled * offset - starting offset for fill within memory referenced by base * cnt - # bytes to be filled * * exit: * The fill has been completed. */ static void execfill(void *base, off_t off, size_t cnt) { /* * 0x90 is an X86 NOP instruction in both 32 and 64-bit worlds. * There are no alignment constraints. */ (void) memset(off + (char *)base, 0x90, cnt); } /* * Return the ld_targ definition for this target. */ const Target * ld_targ_init_x86(void) { static const Target _ld_targ = { { /* Target_mach */ M_MACH, /* m_mach */ M_MACHPLUS, /* m_machplus */ M_FLAGSPLUS, /* m_flagsplus */ M_CLASS, /* m_class */ M_DATA, /* m_data */ M_SEGM_ALIGN, /* m_segm_align */ M_SEGM_ORIGIN, /* m_segm_origin */ M_SEGM_AORIGIN, /* m_segm_aorigin */ M_DATASEG_PERM, /* m_dataseg_perm */ M_STACK_PERM, /* m_stack_perm */ M_WORD_ALIGN, /* m_word_align */ MSG_ORIG(MSG_PTH_RTLD_AMD64), /* m_def_interp */ /* Relocation type codes */ M_R_ARRAYADDR, /* m_r_arrayaddr */ M_R_COPY, /* m_r_copy */ M_R_GLOB_DAT, /* m_r_glob_dat */ M_R_JMP_SLOT, /* m_r_jmp_slot */ M_R_NUM, /* m_r_num */ M_R_NONE, /* m_r_none */ M_R_RELATIVE, /* m_r_relative */ M_R_REGISTER, /* m_r_register */ /* Relocation related constants */ M_REL_DT_COUNT, /* m_rel_dt_count */ M_REL_DT_ENT, /* m_rel_dt_ent */ M_REL_DT_SIZE, /* m_rel_dt_size */ M_REL_DT_TYPE, /* m_rel_dt_type */ M_REL_SHT_TYPE, /* m_rel_sht_type */ /* GOT related constants */ M_GOT_ENTSIZE, /* m_got_entsize */ M_GOT_XNumber, /* m_got_xnumber */ /* PLT related constants */ M_PLT_ALIGN, /* m_plt_align */ M_PLT_ENTSIZE, /* m_plt_entsize */ M_PLT_RESERVSZ, /* m_plt_reservsz */ M_PLT_SHF_FLAGS, /* m_plt_shf_flags */ /* Section type of .eh_frame/.eh_frame_hdr sections */ SHT_AMD64_UNWIND, /* m_sht_unwind */ M_DT_REGISTER, /* m_dt_register */ }, { /* Target_machid */ M_ID_ARRAY, /* id_array */ M_ID_BSS, /* id_bss */ M_ID_CAP, /* id_cap */ M_ID_CAPINFO, /* id_capinfo */ M_ID_CAPCHAIN, /* id_capchain */ M_ID_DATA, /* id_data */ M_ID_DYNAMIC, /* id_dynamic */ M_ID_DYNSORT, /* id_dynsort */ M_ID_DYNSTR, /* id_dynstr */ M_ID_DYNSYM, /* id_dynsym */ M_ID_DYNSYM_NDX, /* id_dynsym_ndx */ M_ID_GOT, /* id_got */ M_ID_UNKNOWN, /* id_gotdata (unused) */ M_ID_HASH, /* id_hash */ M_ID_INTERP, /* id_interp */ M_ID_LBSS, /* id_lbss */ M_ID_LDYNSYM, /* id_ldynsym */ M_ID_NOTE, /* id_note */ M_ID_NULL, /* id_null */ M_ID_PLT, /* id_plt */ M_ID_REL, /* id_rel */ M_ID_STRTAB, /* id_strtab */ M_ID_SYMINFO, /* id_syminfo */ M_ID_SYMTAB, /* id_symtab */ M_ID_SYMTAB_NDX, /* id_symtab_ndx */ M_ID_TEXT, /* id_text */ M_ID_TLS, /* id_tls */ M_ID_TLSBSS, /* id_tlsbss */ M_ID_UNKNOWN, /* id_unknown */ M_ID_UNWIND, /* id_unwind */ M_ID_UNWINDHDR, /* id_unwindhdr */ M_ID_USER, /* id_user */ M_ID_VERSION, /* id_version */ }, { /* Target_nullfunc */ nullfunc_tmpl, /* nf_template */ sizeof (nullfunc_tmpl), /* nf_size */ }, { /* Target_fillfunc */ execfill /* ff_execfill */ }, { /* Target_machrel */ reloc_table, ld_init_rel, /* mr_init_rel */ ld_mach_eflags, /* mr_mach_eflags */ ld_mach_make_dynamic, /* mr_mach_make_dynamic */ ld_mach_update_odynamic, /* mr_mach_update_odynamic */ ld_calc_plt_addr, /* mr_calc_plt_addr */ ld_perform_outreloc, /* mr_perform_outreloc */ ld_do_activerelocs, /* mr_do_activerelocs */ ld_add_outrel, /* mr_add_outrel */ NULL, /* mr_reloc_register */ ld_reloc_local, /* mr_reloc_local */ NULL, /* mr_reloc_GOTOP */ ld_reloc_TLS, /* mr_reloc_TLS */ NULL, /* mr_assign_got */ ld_find_got_ndx, /* mr_find_got_ndx */ ld_calc_got_offset, /* mr_calc_got_offset */ ld_assign_got_ndx, /* mr_assign_got_ndx */ ld_assign_plt_ndx, /* mr_assign_plt_ndx */ NULL, /* mr_allocate_got */ ld_fillin_gotplt, /* mr_fillin_gotplt */ }, { /* Target_machsym */ NULL, /* ms_reg_check */ NULL, /* ms_mach_sym_typecheck */ NULL, /* ms_is_regsym */ NULL, /* ms_reg_find */ NULL /* ms_reg_enter */ } }; return (&_ld_targ); }