elf32_machdep.c revision 153741
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 153741 2005-12-26 21:23:57Z sobomax $ 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 SYS_MAXSYSCALL, 53 sysent, 54 0, 55 0, 56 NULL, 57 0, 58 NULL, 59 NULL, 60 __elfN(freebsd_fixup), 61 sendsig, 62 sigcode, 63 &szsigcode, 64 NULL, 65 "FreeBSD ELF32", 66 __elfN(coredump), 67 NULL, 68 MINSIGSTKSZ, 69 PAGE_SIZE, 70 VM_MIN_ADDRESS, 71 VM_MAXUSER_ADDRESS, 72 USRSTACK, 73 PS_STRINGS, 74 VM_PROT_ALL, 75 exec_copyout_strings, 76 exec_setregs, 77 NULL 78}; 79 80static Elf32_Brandinfo freebsd_brand_info = { 81 ELFOSABI_FREEBSD, 82 EM_PPC, 83 "FreeBSD", 84 NULL, 85 "/libexec/ld-elf.so.1", 86 &elf32_freebsd_sysvec, 87 NULL, 88 0, 89 }; 90 91SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, 92 (sysinit_cfunc_t) elf32_insert_brand_entry, 93 &freebsd_brand_info); 94 95static Elf32_Brandinfo freebsd_brand_oinfo = { 96 ELFOSABI_FREEBSD, 97 EM_PPC, 98 "FreeBSD", 99 NULL, 100 "/usr/libexec/ld-elf.so.1", 101 &elf32_freebsd_sysvec, 102 NULL, 103 0, 104 }; 105 106SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 107 (sysinit_cfunc_t) elf32_insert_brand_entry, 108 &freebsd_brand_oinfo); 109 110 111void 112elf32_dump_thread(struct thread *td __unused, void *dst __unused, 113 size_t *off __unused) 114{ 115} 116 117 118/* Process one elf relocation with addend. */ 119static int 120elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 121 int type, int local, elf_lookup_fn lookup) 122{ 123 Elf_Addr *where; 124 Elf_Half *hwhere; 125 Elf_Addr addr; 126 Elf_Addr addend; 127 Elf_Word rtype, symidx; 128 const Elf_Rela *rela; 129 130 switch (type) { 131 case ELF_RELOC_REL: 132 panic("PPC only supports RELA relocations"); 133 break; 134 case ELF_RELOC_RELA: 135 rela = (const Elf_Rela *)data; 136 where = (Elf_Addr *) (relocbase + rela->r_offset); 137 hwhere = (Elf_Half *) (relocbase + rela->r_offset); 138 addend = rela->r_addend; 139 rtype = ELF_R_TYPE(rela->r_info); 140 symidx = ELF_R_SYM(rela->r_info); 141 break; 142 default: 143 panic("elf_reloc: unknown relocation mode %d\n", type); 144 } 145 146 switch (rtype) { 147 148 case R_PPC_NONE: 149 break; 150 151 case R_PPC_ADDR32: /* word32 S + A */ 152 addr = lookup(lf, symidx, 1); 153 if (addr == 0) 154 return -1; 155 addr += addend; 156 *where = addr; 157 break; 158 159 case R_PPC_ADDR16_LO: /* #lo(S) */ 160 addr = lookup(lf, symidx, 1); 161 if (addr == 0) 162 return -1; 163 /* 164 * addend values are sometimes relative to sections 165 * (i.e. .rodata) in rela, where in reality they 166 * are relative to relocbase. Detect this condition. 167 */ 168 if (addr > relocbase && addr <= (relocbase + addend)) 169 addr = relocbase + addend; 170 else 171 addr += addend; 172 *hwhere = addr & 0xffff; 173 break; 174 175 case R_PPC_ADDR16_HA: /* #ha(S) */ 176 addr = lookup(lf, symidx, 1); 177 if (addr == 0) 178 return -1; 179 /* 180 * addend values are sometimes relative to sections 181 * (i.e. .rodata) in rela, where in reality they 182 * are relative to relocbase. Detect this condition. 183 */ 184 if (addr > relocbase && addr <= (relocbase + addend)) 185 addr = relocbase + addend; 186 else 187 addr += addend; 188 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 189 & 0xffff; 190 break; 191 192 case R_PPC_RELATIVE: /* word32 B + A */ 193 *where = relocbase + addend; 194 break; 195 196 default: 197 printf("kldload: unexpected relocation type %d\n", 198 (int) rtype); 199 return -1; 200 } 201 return(0); 202} 203 204int 205elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 206 elf_lookup_fn lookup) 207{ 208 209 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 210} 211 212int 213elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 214 int type, elf_lookup_fn lookup) 215{ 216 217 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 218} 219 220int 221elf_cpu_load_file(linker_file_t lf) 222{ 223 /* Only sync the cache for non-kernel modules */ 224 if (lf->id != 1) 225 __syncicache(lf->address, lf->size); 226 return (0); 227} 228 229int 230elf_cpu_unload_file(linker_file_t lf __unused) 231{ 232 233 return (0); 234} 235