elf32_machdep.c revision 185169
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 185169 2008-11-22 12:36:15Z 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}; 81 82static Elf32_Brandinfo freebsd_brand_info = { 83 .brand = ELFOSABI_FREEBSD, 84 .machine = EM_PPC, 85 .compat_3_brand = "FreeBSD", 86 .emul_path = NULL, 87 .interp_path = "/libexec/ld-elf.so.1", 88 .sysvec = &elf32_freebsd_sysvec, 89 .interp_newpath = NULL, 90 .flags = BI_CAN_EXEC_DYN, 91}; 92 93SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, 94 (sysinit_cfunc_t) elf32_insert_brand_entry, 95 &freebsd_brand_info); 96 97static Elf32_Brandinfo freebsd_brand_oinfo = { 98 .brand = ELFOSABI_FREEBSD, 99 .machine = EM_PPC, 100 .compat_3_brand = "FreeBSD", 101 .emul_path = NULL, 102 .interp_path = "/usr/libexec/ld-elf.so.1", 103 .sysvec = &elf32_freebsd_sysvec, 104 .interp_newpath = NULL, 105 .flags = BI_CAN_EXEC_DYN, 106}; 107 108SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 109 (sysinit_cfunc_t) elf32_insert_brand_entry, 110 &freebsd_brand_oinfo); 111 112 113void 114elf32_dump_thread(struct thread *td __unused, void *dst __unused, 115 size_t *off __unused) 116{ 117} 118 119 120/* Process one elf relocation with addend. */ 121static int 122elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 123 int type, int local, elf_lookup_fn lookup) 124{ 125 Elf_Addr *where; 126 Elf_Half *hwhere; 127 Elf_Addr addr; 128 Elf_Addr addend; 129 Elf_Word rtype, symidx; 130 const Elf_Rela *rela; 131 132 switch (type) { 133 case ELF_RELOC_REL: 134 panic("PPC only supports RELA relocations"); 135 break; 136 case ELF_RELOC_RELA: 137 rela = (const Elf_Rela *)data; 138 where = (Elf_Addr *) (relocbase + rela->r_offset); 139 hwhere = (Elf_Half *) (relocbase + rela->r_offset); 140 addend = rela->r_addend; 141 rtype = ELF_R_TYPE(rela->r_info); 142 symidx = ELF_R_SYM(rela->r_info); 143 break; 144 default: 145 panic("elf_reloc: unknown relocation mode %d\n", type); 146 } 147 148 switch (rtype) { 149 150 case R_PPC_NONE: 151 break; 152 153 case R_PPC_ADDR32: /* word32 S + A */ 154 addr = lookup(lf, symidx, 1); 155 if (addr == 0) 156 return -1; 157 addr += addend; 158 *where = addr; 159 break; 160 161 case R_PPC_ADDR16_LO: /* #lo(S) */ 162 addr = lookup(lf, symidx, 1); 163 if (addr == 0) 164 return -1; 165 /* 166 * addend values are sometimes relative to sections 167 * (i.e. .rodata) in rela, where in reality they 168 * are relative to relocbase. Detect this condition. 169 */ 170 if (addr > relocbase && addr <= (relocbase + addend)) 171 addr = relocbase + addend; 172 else 173 addr += addend; 174 *hwhere = addr & 0xffff; 175 break; 176 177 case R_PPC_ADDR16_HA: /* #ha(S) */ 178 addr = lookup(lf, symidx, 1); 179 if (addr == 0) 180 return -1; 181 /* 182 * addend values are sometimes relative to sections 183 * (i.e. .rodata) in rela, where in reality they 184 * are relative to relocbase. Detect this condition. 185 */ 186 if (addr > relocbase && addr <= (relocbase + addend)) 187 addr = relocbase + addend; 188 else 189 addr += addend; 190 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 191 & 0xffff; 192 break; 193 194 case R_PPC_RELATIVE: /* word32 B + A */ 195 *where = relocbase + addend; 196 break; 197 198 default: 199 printf("kldload: unexpected relocation type %d\n", 200 (int) rtype); 201 return -1; 202 } 203 return(0); 204} 205 206int 207elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 208 elf_lookup_fn lookup) 209{ 210 211 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 212} 213 214int 215elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 216 int type, elf_lookup_fn lookup) 217{ 218 219 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 220} 221 222int 223elf_cpu_load_file(linker_file_t lf) 224{ 225 /* Only sync the cache for non-kernel modules */ 226 if (lf->id != 1) 227 __syncicache(lf->address, lf->size); 228 return (0); 229} 230 231int 232elf_cpu_unload_file(linker_file_t lf __unused) 233{ 234 235 return (0); 236} 237