Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/elf_machdep.c
Version:
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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: releng/10.2/sys/arm/arm/elf_machdep.c 266373 2014-05-17 22:50:16Z ian $"); 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 49 struct 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 84 static 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 96 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 97 (sysinit_cfunc_t) elf32_insert_brand_entry, 98 &freebsd_brand_info); 99 100 static 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 }; 111 112 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 113 (sysinit_cfunc_t) elf32_insert_brand_entry, 114 &freebsd_brand_oinfo); 115 116 117 void 118 elf32_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. */ 125 static int 126 elf_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; 135 136 switch (type) { 137 case ELF_RELOC_REL: 138 rel = (const Elf_Rel *)data; 139 where = (Elf_Addr *) (relocbase + rel->r_offset); 140 addend = *where; 141 rtype = ELF_R_TYPE(rel->r_info); 142 symidx = ELF_R_SYM(rel->r_info); 143 break; 144 case ELF_RELOC_RELA: 145 rela = (const Elf_Rela *)data; 146 where = (Elf_Addr *) (relocbase + rela->r_offset); 147 addend = rela->r_addend; 148 rtype = ELF_R_TYPE(rela->r_info); 149 symidx = ELF_R_SYM(rela->r_info); 150 break; 151 default: 152 panic("unknown reloc type %d\n", type); 153 } 154 155 if (local) { 156 if (rtype == R_ARM_RELATIVE) { /* A + B */ 157 addr = elf_relocaddr(lf, relocbase + addend); 158 if (*where != addr) 159 *where = addr; 160 } 161 return (0); 162 } 163 164 switch (rtype) { 165 166 case R_ARM_NONE: /* none */ 167 break; 168 169 case R_ARM_ABS32: 170 addr = lookup(lf, symidx, 1); 171 if (addr == 0) 172 return -1; 173 *where += addr; 174 break; 175 176 case R_ARM_COPY: /* none */ 177 /* 178 * There shouldn't be copy relocations in kernel 179 * objects. 180 */ 181 printf("kldload: unexpected R_COPY relocation\n"); 182 return -1; 183 break; 184 185 case R_ARM_JUMP_SLOT: 186 addr = lookup(lf, symidx, 1); 187 if (addr) { 188 *where = addr; 189 return (0); 190 } 191 return (-1); 192 case R_ARM_RELATIVE: 193 break; 194 195 default: 196 printf("kldload: unexpected relocation type %d\n", 197 rtype); 198 return -1; 199 } 200 return(0); 201 } 202 203 int 204 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 205 elf_lookup_fn lookup) 206 { 207 208 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 209 } 210 211 int 212 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 213 int type, elf_lookup_fn lookup) 214 { 215 216 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 217 } 218 219 int 220 elf_cpu_load_file(linker_file_t lf __unused) 221 { 222 223 /* 224 * The pmap code does not do an icache sync upon establishing executable 225 * mappings in the kernel pmap. It's an optimization based on the fact 226 * that kernel memory allocations always have EXECUTABLE protection even 227 * when the memory isn't going to hold executable code. The only time 228 * kernel memory holding instructions does need a sync is after loading 229 * a kernel module, and that's when this function gets called. Normal 230 * data cache maintenance has already been done by the IO code, and TLB 231 * maintenance has been done by the pmap code, so all we have to do here 232 * is invalidate the instruction cache (which also invalidates the 233 * branch predictor cache on platforms that have one). 234 */ 235 cpu_icache_sync_all(); 236 return (0); 237 } 238 239 int 240 elf_cpu_unload_file(linker_file_t lf __unused) 241 { 242 243 return (0); 244 }
Cache object: 82a111c32a3e4ac769c5861e08cacd09
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