elf_machdep.c revision 197729
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 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: head/sys/arm/arm/elf_machdep.c 197729 2009-10-03 11:57:21Z bz $"); 28 29#include <sys/param.h> 30#include <sys/kernel.h> 31#include <sys/systm.h> 32#include <sys/exec.h> 33#include <sys/imgact.h> 34#include <sys/linker.h> 35#include <sys/sysent.h> 36#include <sys/imgact_elf.h> 37#include <sys/syscall.h> 38#include <sys/signalvar.h> 39#include <sys/vnode.h> 40 41#include <vm/vm.h> 42#include <vm/pmap.h> 43#include <vm/vm_param.h> 44 45#include <machine/elf.h> 46#include <machine/md_var.h> 47 48struct sysentvec elf32_freebsd_sysvec = { 49 .sv_size = SYS_MAXSYSCALL, 50 .sv_table = sysent, 51 .sv_mask = 0, 52 .sv_sigsize = 0, 53 .sv_sigtbl = NULL, 54 .sv_errsize = 0, 55 .sv_errtbl = NULL, 56 .sv_transtrap = NULL, 57 .sv_fixup = __elfN(freebsd_fixup), 58 .sv_sendsig = sendsig, 59 .sv_sigcode = sigcode, 60 .sv_szsigcode = &szsigcode, 61 .sv_prepsyscall = NULL, 62 .sv_name = "FreeBSD ELF32", 63 .sv_coredump = __elfN(coredump), 64 .sv_imgact_try = NULL, 65 .sv_minsigstksz = MINSIGSTKSZ, 66 .sv_pagesize = PAGE_SIZE, 67 .sv_minuser = VM_MIN_ADDRESS, 68 .sv_maxuser = VM_MAXUSER_ADDRESS, 69 .sv_usrstack = USRSTACK, 70 .sv_psstrings = PS_STRINGS, 71 .sv_stackprot = VM_PROT_ALL, 72 .sv_copyout_strings = exec_copyout_strings, 73 .sv_setregs = exec_setregs, 74 .sv_fixlimit = NULL, 75 .sv_maxssiz = NULL, 76 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 77}; 78 79static Elf32_Brandinfo freebsd_brand_info = { 80 .brand = ELFOSABI_FREEBSD, 81 .machine = EM_ARM, 82 .compat_3_brand = "FreeBSD", 83 .emul_path = NULL, 84 .interp_path = "/libexec/ld-elf.so.1", 85 .sysvec = &elf32_freebsd_sysvec, 86 .interp_newpath = NULL, 87 .brand_note = &elf32_freebsd_brandnote, 88 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 89}; 90 91SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 92 (sysinit_cfunc_t) elf32_insert_brand_entry, 93 &freebsd_brand_info); 94 95static Elf32_Brandinfo freebsd_brand_oinfo = { 96 .brand = ELFOSABI_FREEBSD, 97 .machine = EM_ARM, 98 .compat_3_brand = "FreeBSD", 99 .emul_path = NULL, 100 .interp_path = "/usr/libexec/ld-elf.so.1", 101 .sysvec = &elf32_freebsd_sysvec, 102 .interp_newpath = NULL, 103 .brand_note = &elf32_freebsd_brandnote, 104 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 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_Addr addr; 126 Elf_Addr addend; 127 Elf_Word rtype, symidx; 128 const Elf_Rel *rel; 129 const Elf_Rela *rela; 130 131 switch (type) { 132 case ELF_RELOC_REL: 133 rel = (const Elf_Rel *)data; 134 where = (Elf_Addr *) (relocbase + rel->r_offset); 135 addend = *where; 136 rtype = ELF_R_TYPE(rel->r_info); 137 symidx = ELF_R_SYM(rel->r_info); 138 break; 139 case ELF_RELOC_RELA: 140 rela = (const Elf_Rela *)data; 141 where = (Elf_Addr *) (relocbase + rela->r_offset); 142 addend = rela->r_addend; 143 rtype = ELF_R_TYPE(rela->r_info); 144 symidx = ELF_R_SYM(rela->r_info); 145 break; 146 default: 147 panic("unknown reloc type %d\n", type); 148 } 149 150 if (local) { 151 if (rtype == R_ARM_RELATIVE) { /* A + B */ 152 addr = elf_relocaddr(lf, relocbase + addend); 153 if (*where != addr) 154 *where = addr; 155 } 156 return (0); 157 } 158 159 switch (rtype) { 160 161 case R_ARM_NONE: /* none */ 162 break; 163 164 case R_ARM_ABS32: 165 addr = lookup(lf, symidx, 1); 166 if (addr == 0) 167 return -1; 168 if (*where != addr) 169 *where = addr; 170 171 break; 172 173 case R_ARM_COPY: /* none */ 174 /* 175 * There shouldn't be copy relocations in kernel 176 * objects. 177 */ 178 printf("kldload: unexpected R_COPY relocation\n"); 179 return -1; 180 break; 181 182 case R_ARM_JUMP_SLOT: 183 addr = lookup(lf, symidx, 1); 184 if (addr) { 185 *where = addr; 186 return (0); 187 } 188 return (-1); 189 case R_ARM_RELATIVE: 190 break; 191 192 default: 193 printf("kldload: unexpected relocation type %d\n", 194 rtype); 195 return -1; 196 } 197 return(0); 198} 199 200int 201elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 202 elf_lookup_fn lookup) 203{ 204 205 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 206} 207 208int 209elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 210 int type, elf_lookup_fn lookup) 211{ 212 213 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 214} 215 216int 217elf_cpu_load_file(linker_file_t lf __unused) 218{ 219 220 cpu_idcache_wbinv_all(); 221 cpu_l2cache_wbinv_all(); 222 cpu_tlb_flushID(); 223 return (0); 224} 225 226int 227elf_cpu_unload_file(linker_file_t lf __unused) 228{ 229 230 return (0); 231} 232