elf32_machdep.c revision 208453
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 208453 2010-05-23 18:32:02Z 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 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 80 .sv_set_syscall_retval = cpu_set_syscall_retval, 81 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 82 .sv_syscallnames = syscallnames, 83}; 84 85static Elf32_Brandinfo freebsd_brand_info = { 86 .brand = ELFOSABI_FREEBSD, 87 .machine = EM_PPC, 88 .compat_3_brand = "FreeBSD", 89 .emul_path = NULL, 90 .interp_path = "/libexec/ld-elf.so.1", 91 .sysvec = &elf32_freebsd_sysvec, 92 .interp_newpath = NULL, 93 .brand_note = &elf32_freebsd_brandnote, 94 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 95}; 96 97SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 98 (sysinit_cfunc_t) elf32_insert_brand_entry, 99 &freebsd_brand_info); 100 101static Elf32_Brandinfo freebsd_brand_oinfo = { 102 .brand = ELFOSABI_FREEBSD, 103 .machine = EM_PPC, 104 .compat_3_brand = "FreeBSD", 105 .emul_path = NULL, 106 .interp_path = "/usr/libexec/ld-elf.so.1", 107 .sysvec = &elf32_freebsd_sysvec, 108 .interp_newpath = NULL, 109 .brand_note = &elf32_freebsd_brandnote, 110 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 111}; 112 113SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 114 (sysinit_cfunc_t) elf32_insert_brand_entry, 115 &freebsd_brand_oinfo); 116 117 118void 119elf32_dump_thread(struct thread *td __unused, void *dst __unused, 120 size_t *off __unused) 121{ 122} 123 124 125/* Process one elf relocation with addend. */ 126static int 127elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 128 int type, int local, elf_lookup_fn lookup) 129{ 130 Elf_Addr *where; 131 Elf_Half *hwhere; 132 Elf_Addr addr; 133 Elf_Addr addend; 134 Elf_Word rtype, symidx; 135 const Elf_Rela *rela; 136 137 switch (type) { 138 case ELF_RELOC_REL: 139 panic("PPC only supports RELA relocations"); 140 break; 141 case ELF_RELOC_RELA: 142 rela = (const Elf_Rela *)data; 143 where = (Elf_Addr *) (relocbase + rela->r_offset); 144 hwhere = (Elf_Half *) (relocbase + rela->r_offset); 145 addend = rela->r_addend; 146 rtype = ELF_R_TYPE(rela->r_info); 147 symidx = ELF_R_SYM(rela->r_info); 148 break; 149 default: 150 panic("elf_reloc: unknown relocation mode %d\n", type); 151 } 152 153 switch (rtype) { 154 155 case R_PPC_NONE: 156 break; 157 158 case R_PPC_ADDR32: /* word32 S + A */ 159 addr = lookup(lf, symidx, 1); 160 if (addr == 0) 161 return -1; 162 addr += addend; 163 *where = addr; 164 break; 165 166 case R_PPC_ADDR16_LO: /* #lo(S) */ 167 addr = lookup(lf, symidx, 1); 168 if (addr == 0) 169 return -1; 170 /* 171 * addend values are sometimes relative to sections 172 * (i.e. .rodata) in rela, where in reality they 173 * are relative to relocbase. Detect this condition. 174 */ 175 if (addr > relocbase && addr <= (relocbase + addend)) 176 addr = relocbase + addend; 177 else 178 addr += addend; 179 *hwhere = addr & 0xffff; 180 break; 181 182 case R_PPC_ADDR16_HA: /* #ha(S) */ 183 addr = lookup(lf, symidx, 1); 184 if (addr == 0) 185 return -1; 186 /* 187 * addend values are sometimes relative to sections 188 * (i.e. .rodata) in rela, where in reality they 189 * are relative to relocbase. Detect this condition. 190 */ 191 if (addr > relocbase && addr <= (relocbase + addend)) 192 addr = relocbase + addend; 193 else 194 addr += addend; 195 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 196 & 0xffff; 197 break; 198 199 case R_PPC_RELATIVE: /* word32 B + A */ 200 *where = elf_relocaddr(lf, relocbase + addend); 201 break; 202 203 default: 204 printf("kldload: unexpected relocation type %d\n", 205 (int) rtype); 206 return -1; 207 } 208 return(0); 209} 210 211int 212elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 213 elf_lookup_fn lookup) 214{ 215 216 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 217} 218 219int 220elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 221 int type, elf_lookup_fn lookup) 222{ 223 224 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 225} 226 227int 228elf_cpu_load_file(linker_file_t lf) 229{ 230 /* Only sync the cache for non-kernel modules */ 231 if (lf->id != 1) 232 __syncicache(lf->address, lf->size); 233 return (0); 234} 235 236int 237elf_cpu_unload_file(linker_file_t lf __unused) 238{ 239 240 return (0); 241} 242