elf_machdep.c revision 288287
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: stable/10/sys/arm/arm/elf_machdep.c 288287 2015-09-27 01:33:43Z kib $"); 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/proc.h> 38#include <sys/syscall.h> 39#include <sys/signalvar.h> 40#include <sys/vnode.h> 41 42#include <vm/vm.h> 43#include <vm/pmap.h> 44#include <vm/vm_param.h> 45 46#include <machine/elf.h> 47#include <machine/md_var.h> 48 49struct sysentvec elf32_freebsd_sysvec = { 50 .sv_size = SYS_MAXSYSCALL, 51 .sv_table = sysent, 52 .sv_mask = 0, 53 .sv_sigsize = 0, 54 .sv_sigtbl = NULL, 55 .sv_errsize = 0, 56 .sv_errtbl = NULL, 57 .sv_transtrap = NULL, 58 .sv_fixup = __elfN(freebsd_fixup), 59 .sv_sendsig = sendsig, 60 .sv_sigcode = sigcode, 61 .sv_szsigcode = &szsigcode, 62 .sv_prepsyscall = NULL, 63 .sv_name = "FreeBSD ELF32", 64 .sv_coredump = __elfN(coredump), 65 .sv_imgact_try = NULL, 66 .sv_minsigstksz = MINSIGSTKSZ, 67 .sv_pagesize = PAGE_SIZE, 68 .sv_minuser = VM_MIN_ADDRESS, 69 .sv_maxuser = VM_MAXUSER_ADDRESS, 70 .sv_usrstack = USRSTACK, 71 .sv_psstrings = PS_STRINGS, 72 .sv_stackprot = VM_PROT_ALL, 73 .sv_copyout_strings = exec_copyout_strings, 74 .sv_setregs = exec_setregs, 75 .sv_fixlimit = NULL, 76 .sv_maxssiz = NULL, 77 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 78 .sv_set_syscall_retval = cpu_set_syscall_retval, 79 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 80 .sv_syscallnames = syscallnames, 81 .sv_schedtail = NULL, 82}; 83 84static Elf32_Brandinfo freebsd_brand_info = { 85 .brand = ELFOSABI_FREEBSD, 86 .machine = EM_ARM, 87 .compat_3_brand = "FreeBSD", 88 .emul_path = NULL, 89 .interp_path = "/libexec/ld-elf.so.1", 90 .sysvec = &elf32_freebsd_sysvec, 91 .interp_newpath = NULL, 92 .brand_note = &elf32_freebsd_brandnote, 93 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 94}; 95 96SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 97 (sysinit_cfunc_t) elf32_insert_brand_entry, 98 &freebsd_brand_info); 99 100static Elf32_Brandinfo freebsd_brand_oinfo = { 101 .brand = ELFOSABI_FREEBSD, 102 .machine = EM_ARM, 103 .compat_3_brand = "FreeBSD", 104 .emul_path = NULL, 105 .interp_path = "/usr/libexec/ld-elf.so.1", 106 .sysvec = &elf32_freebsd_sysvec, 107 .interp_newpath = NULL, 108 .brand_note = &elf32_freebsd_brandnote, 109 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 110}; 111 112SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 113 (sysinit_cfunc_t) elf32_insert_brand_entry, 114 &freebsd_brand_oinfo); 115 116 117void 118elf32_dump_thread(struct thread *td __unused, void *dst __unused, 119 size_t *off __unused) 120{ 121} 122 123 124/* Process one elf relocation with addend. */ 125static int 126elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 127 int type, int local, elf_lookup_fn lookup) 128{ 129 Elf_Addr *where; 130 Elf_Addr addr; 131 Elf_Addr addend; 132 Elf_Word rtype, symidx; 133 const Elf_Rel *rel; 134 const Elf_Rela *rela; 135 int error; 136 137 switch (type) { 138 case ELF_RELOC_REL: 139 rel = (const Elf_Rel *)data; 140 where = (Elf_Addr *) (relocbase + rel->r_offset); 141 addend = *where; 142 rtype = ELF_R_TYPE(rel->r_info); 143 symidx = ELF_R_SYM(rel->r_info); 144 break; 145 case ELF_RELOC_RELA: 146 rela = (const Elf_Rela *)data; 147 where = (Elf_Addr *) (relocbase + rela->r_offset); 148 addend = rela->r_addend; 149 rtype = ELF_R_TYPE(rela->r_info); 150 symidx = ELF_R_SYM(rela->r_info); 151 break; 152 default: 153 panic("unknown reloc type %d\n", type); 154 } 155 156 if (local) { 157 if (rtype == R_ARM_RELATIVE) { /* A + B */ 158 addr = elf_relocaddr(lf, relocbase + addend); 159 if (*where != addr) 160 *where = addr; 161 } 162 return (0); 163 } 164 165 switch (rtype) { 166 167 case R_ARM_NONE: /* none */ 168 break; 169 170 case R_ARM_ABS32: 171 error = lookup(lf, symidx, 1, &addr); 172 if (error != 0) 173 return -1; 174 *where += addr; 175 break; 176 177 case R_ARM_COPY: /* none */ 178 /* 179 * There shouldn't be copy relocations in kernel 180 * objects. 181 */ 182 printf("kldload: unexpected R_COPY relocation\n"); 183 return -1; 184 break; 185 186 case R_ARM_JUMP_SLOT: 187 error = lookup(lf, symidx, 1, &addr); 188 if (error == 0) { 189 *where = addr; 190 return (0); 191 } 192 return (-1); 193 case R_ARM_RELATIVE: 194 break; 195 196 default: 197 printf("kldload: unexpected relocation type %d\n", 198 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 __unused) 222{ 223 224 /* 225 * The pmap code does not do an icache sync upon establishing executable 226 * mappings in the kernel pmap. It's an optimization based on the fact 227 * that kernel memory allocations always have EXECUTABLE protection even 228 * when the memory isn't going to hold executable code. The only time 229 * kernel memory holding instructions does need a sync is after loading 230 * a kernel module, and that's when this function gets called. Normal 231 * data cache maintenance has already been done by the IO code, and TLB 232 * maintenance has been done by the pmap code, so all we have to do here 233 * is invalidate the instruction cache (which also invalidates the 234 * branch predictor cache on platforms that have one). 235 */ 236 cpu_icache_sync_all(); 237 return (0); 238} 239 240int 241elf_cpu_unload_file(linker_file_t lf __unused) 242{ 243 244 return (0); 245} 246