elf32_machdep.c revision 183322
1/*- 2 * Copyright 1996-1998 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD: head/sys/powerpc/powerpc/elf_machdep.c 183322 2008-09-24 10:14:37Z kib $ 26 */ 27 28#include <sys/param.h> 29#include <sys/kernel.h> 30#include <sys/systm.h> 31#include <sys/exec.h> 32#include <sys/imgact.h> 33#include <sys/malloc.h> 34#include <sys/proc.h> 35#include <sys/namei.h> 36#include <sys/fcntl.h> 37#include <sys/sysent.h> 38#include <sys/imgact_elf.h> 39#include <sys/syscall.h> 40#include <sys/signalvar.h> 41#include <sys/vnode.h> 42#include <sys/linker.h> 43 44#include <vm/vm.h> 45#include <vm/vm_param.h> 46 47#include <machine/cpu.h> 48#include <machine/elf.h> 49#include <machine/md_var.h> 50 51struct sysentvec elf32_freebsd_sysvec = { 52 .sv_size = SYS_MAXSYSCALL, 53 .sv_table = sysent, 54 .sv_mask = 0, 55 .sv_sigsize = 0, 56 .sv_sigtbl = NULL, 57 .sv_errsize = 0, 58 .sv_errtbl = NULL, 59 .sv_transtrap = NULL, 60 .sv_fixup = __elfN(freebsd_fixup), 61 .sv_sendsig = sendsig, 62 .sv_sigcode = sigcode, 63 .sv_szsigcode = &szsigcode, 64 .sv_prepsyscall = NULL, 65 .sv_name = "FreeBSD ELF32", 66 .sv_coredump = __elfN(coredump), 67 .sv_imgact_try = NULL, 68 .sv_minsigstksz = MINSIGSTKSZ, 69 .sv_pagesize = PAGE_SIZE, 70 .sv_minuser = VM_MIN_ADDRESS, 71 .sv_maxuser = VM_MAXUSER_ADDRESS, 72 .sv_usrstack = USRSTACK, 73 .sv_psstrings = PS_STRINGS, 74 .sv_stackprot = VM_PROT_ALL, 75 .sv_copyout_strings = exec_copyout_strings, 76 .sv_setregs = exec_setregs, 77 .sv_fixlimit = NULL, 78 .sv_maxssiz = NULL 79}; 80 81static Elf32_Brandinfo freebsd_brand_info = { 82 .brand = ELFOSABI_FREEBSD, 83 .machine = EM_PPC, 84 .compat_3_brand = "FreeBSD", 85 .emul_path = NULL, 86 .interp_path = "/libexec/ld-elf.so.1", 87 .sysvec = &elf32_freebsd_sysvec, 88 .interp_newpath = NULL, 89 .flags = BI_CAN_EXEC_DYN, 90}; 91 92SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, 93 (sysinit_cfunc_t) elf32_insert_brand_entry, 94 &freebsd_brand_info); 95 96static Elf32_Brandinfo freebsd_brand_oinfo = { 97 .brand = ELFOSABI_FREEBSD, 98 .machine = EM_PPC, 99 .compat_3_brand = "FreeBSD", 100 .emul_path = NULL, 101 .interp_path = "/usr/libexec/ld-elf.so.1", 102 .sysvec = &elf32_freebsd_sysvec, 103 .interp_newpath = NULL, 104 .flags = BI_CAN_EXEC_DYN, 105}; 106 107SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 108 (sysinit_cfunc_t) elf32_insert_brand_entry, 109 &freebsd_brand_oinfo); 110 111 112void 113elf32_dump_thread(struct thread *td __unused, void *dst __unused, 114 size_t *off __unused) 115{ 116} 117 118 119/* Process one elf relocation with addend. */ 120static int 121elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 122 int type, int local, elf_lookup_fn lookup) 123{ 124 Elf_Addr *where; 125 Elf_Half *hwhere; 126 Elf_Addr addr; 127 Elf_Addr addend; 128 Elf_Word rtype, symidx; 129 const Elf_Rela *rela; 130 131 switch (type) { 132 case ELF_RELOC_REL: 133 panic("PPC only supports RELA relocations"); 134 break; 135 case ELF_RELOC_RELA: 136 rela = (const Elf_Rela *)data; 137 where = (Elf_Addr *) (relocbase + rela->r_offset); 138 hwhere = (Elf_Half *) (relocbase + rela->r_offset); 139 addend = rela->r_addend; 140 rtype = ELF_R_TYPE(rela->r_info); 141 symidx = ELF_R_SYM(rela->r_info); 142 break; 143 default: 144 panic("elf_reloc: unknown relocation mode %d\n", type); 145 } 146 147 switch (rtype) { 148 149 case R_PPC_NONE: 150 break; 151 152 case R_PPC_ADDR32: /* word32 S + A */ 153 addr = lookup(lf, symidx, 1); 154 if (addr == 0) 155 return -1; 156 addr += addend; 157 *where = addr; 158 break; 159 160 case R_PPC_ADDR16_LO: /* #lo(S) */ 161 addr = lookup(lf, symidx, 1); 162 if (addr == 0) 163 return -1; 164 /* 165 * addend values are sometimes relative to sections 166 * (i.e. .rodata) in rela, where in reality they 167 * are relative to relocbase. Detect this condition. 168 */ 169 if (addr > relocbase && addr <= (relocbase + addend)) 170 addr = relocbase + addend; 171 else 172 addr += addend; 173 *hwhere = addr & 0xffff; 174 break; 175 176 case R_PPC_ADDR16_HA: /* #ha(S) */ 177 addr = lookup(lf, symidx, 1); 178 if (addr == 0) 179 return -1; 180 /* 181 * addend values are sometimes relative to sections 182 * (i.e. .rodata) in rela, where in reality they 183 * are relative to relocbase. Detect this condition. 184 */ 185 if (addr > relocbase && addr <= (relocbase + addend)) 186 addr = relocbase + addend; 187 else 188 addr += addend; 189 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 190 & 0xffff; 191 break; 192 193 case R_PPC_RELATIVE: /* word32 B + A */ 194 *where = relocbase + addend; 195 break; 196 197 default: 198 printf("kldload: unexpected relocation type %d\n", 199 (int) rtype); 200 return -1; 201 } 202 return(0); 203} 204 205int 206elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 207 elf_lookup_fn lookup) 208{ 209 210 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 211} 212 213int 214elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 215 int type, elf_lookup_fn lookup) 216{ 217 218 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 219} 220 221int 222elf_cpu_load_file(linker_file_t lf) 223{ 224 /* Only sync the cache for non-kernel modules */ 225 if (lf->id != 1) 226 __syncicache(lf->address, lf->size); 227 return (0); 228} 229 230int 231elf_cpu_unload_file(linker_file_t lf __unused) 232{ 233 234 return (0); 235} 236