/* * 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) 1988 AT&T * All Rights Reserved * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * i386 specific setup routine - relocate ld.so's symbols, setup its * environment, map in loadable sections of the executable. * * Takes base address ld.so was loaded at, address of ld.so's dynamic * structure, address of process environment pointers, address of auxiliary * vector and * argv[0] (process name). * If errors occur, send process signal - otherwise * return executable's entry point to the bootstrap routine. */ #include "_synonyms.h" #include #include #include #include #include #include #include #include #include "_rtld.h" #include "_audit.h" #include "msg.h" extern int _end; extern int _etext; /* * Stub routine to prevent atexit_init() being extracted from libc_pic.a on * i386 and added to ld.so.1. We don't need it. */ void atexit_init() { } /* VARARGS */ unsigned long _setup(Boot * ebp, Dyn * ld_dyn) { unsigned long reladdr, relcount, ld_base = 0; unsigned long relent = 0; unsigned long strtab, soname, interp_base = 0; char *_rt_name, **_envp, **_argv; int _syspagsz = 0, fd = -1, dz_fd = FD_UNAVAIL; uint_t _flags = 0, hwcap_1 = 0; Dyn * dyn_ptr; Phdr * phdr = 0; Rt_map * lmp; auxv_t *auxv, *_auxv; uid_t uid = -1, euid = -1; gid_t gid = -1, egid = -1; char *_platform = 0, *_execname = 0, *_emulator = 0; int auxflags = -1; /* * Scan the bootstrap structure to pick up the basics. */ for (; ebp->eb_tag != EB_NULL; ebp++) switch (ebp->eb_tag) { case EB_LDSO_BASE: ld_base = (unsigned long)ebp->eb_un.eb_val; break; case EB_ARGV: _argv = (char **)ebp->eb_un.eb_ptr; break; case EB_ENVP: _envp = (char **)ebp->eb_un.eb_ptr; break; case EB_AUXV: _auxv = (auxv_t *)ebp->eb_un.eb_ptr; break; case EB_DEVZERO: dz_fd = (int)ebp->eb_un.eb_val; break; case EB_PAGESIZE: _syspagsz = (int)ebp->eb_un.eb_val; break; } /* * Search the aux. vector for the information passed by exec. */ for (auxv = _auxv; auxv->a_type != AT_NULL; auxv++) { switch (auxv->a_type) { case AT_EXECFD: /* this is the old exec that passes a file descriptor */ fd = (int)auxv->a_un.a_val; break; case AT_FLAGS: /* processor flags (MAU available, etc) */ _flags = auxv->a_un.a_val; break; case AT_PAGESZ: /* system page size */ _syspagsz = (int)auxv->a_un.a_val; break; case AT_PHDR: /* address of the segment table */ phdr = (Phdr *)auxv->a_un.a_ptr; break; case AT_BASE: /* interpreter base address */ if (ld_base == 0) ld_base = auxv->a_un.a_val; interp_base = auxv->a_un.a_val; break; case AT_SUN_UID: /* effective user id for the executable */ euid = (uid_t)auxv->a_un.a_val; break; case AT_SUN_RUID: /* real user id for the executable */ uid = (uid_t)auxv->a_un.a_val; break; case AT_SUN_GID: /* effective group id for the executable */ egid = (gid_t)auxv->a_un.a_val; break; case AT_SUN_RGID: /* real group id for the executable */ gid = (gid_t)auxv->a_un.a_val; break; #ifdef AT_SUN_PLATFORM /* Defined on SunOS 5.5 & greater. */ case AT_SUN_PLATFORM: /* platform name */ _platform = auxv->a_un.a_ptr; break; #endif #ifdef AT_SUN_EXECNAME /* Defined on SunOS 5.6 & greater. */ case AT_SUN_EXECNAME: /* full pathname of execed object */ _execname = auxv->a_un.a_ptr; break; #endif #ifdef AT_SUN_AUXFLAGS /* At the behest of PSARC 2002/188 */ case AT_SUN_AUXFLAGS: auxflags = (int)auxv->a_un.a_val; break; #endif #ifdef AT_SUN_HWCAP /* Hardware capabilities */ case AT_SUN_HWCAP: hwcap_1 = (uint_t)auxv->a_un.a_val; break; #endif #ifdef AT_SUN_EMULATOR /* Emulation library name */ case AT_SUN_EMULATOR: /* name of emulation library, if any */ _emulator = auxv->a_un.a_ptr; break; #endif } } /* * Get needed info from ld.so's dynamic structure. */ /* LINTED */ dyn_ptr = (Dyn *)((char *)ld_dyn + ld_base); for (ld_dyn = dyn_ptr; ld_dyn->d_tag != DT_NULL; ld_dyn++) { switch (ld_dyn->d_tag) { case DT_REL: reladdr = ld_dyn->d_un.d_ptr + ld_base; break; case DT_RELCOUNT: relcount = ld_dyn->d_un.d_val; break; case DT_RELENT: relent = ld_dyn->d_un.d_val; break; case DT_STRTAB: strtab = ld_dyn->d_un.d_ptr + ld_base; break; case DT_SONAME: soname = ld_dyn->d_un.d_val; break; } } _rt_name = (char *)strtab + soname; /* * If we don't have a RELENT, just assume * the size. */ if (relent == 0) relent = sizeof (Rel); /* * Relocate all symbols in ld.so. * * Because ld.so.1 is built with -Bsymbolic there should only be * RELATIVE and JMPSLOT relocations, both of which get relative * additions against them. */ for (; relcount; relcount--) { ulong_t roffset; roffset = ((Rel *)reladdr)->r_offset + ld_base; *((ulong_t *)roffset) += ld_base; reladdr += relent; } /* * If an emulation library is being used, use that as the linker's * effective executable name. The real executable is not linked by this * linker. */ if (_emulator != NULL) { _execname = _emulator; rtld_flags2 |= RT_FL2_BRANDED; } /* * Initialize the dyn_plt_ent_size field. It currently contains the * size of the dyn_plt_template. It still needs to be aligned and have * space for the 'dyn_data' area added. */ dyn_plt_ent_size = ROUND(dyn_plt_ent_size, M_WORD_ALIGN) + sizeof (uintptr_t) + sizeof (uintptr_t) + sizeof (ulong_t) + sizeof (ulong_t) + sizeof (Sym); /* * Continue with generic startup processing. */ if ((lmp = setup((char **)_envp, (auxv_t *)_auxv, _flags, _platform, _syspagsz, _rt_name, dyn_ptr, ld_base, interp_base, fd, phdr, _execname, _argv, dz_fd, uid, euid, gid, egid, NULL, auxflags, hwcap_1)) == NULL) { rtldexit(&lml_main, 1); } return (LM_ENTRY_PT(lmp)()); }