Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/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 * $FreeBSD: releng/8.4/sys/powerpc/powerpc/elf_machdep.c 222846 2011-06-08 03:45:40Z dchagin $ 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 51 struct 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 .sv_schedtail = NULL, 84 }; 85 86 static Elf32_Brandinfo freebsd_brand_info = { 87 .brand = ELFOSABI_FREEBSD, 88 .machine = EM_PPC, 89 .compat_3_brand = "FreeBSD", 90 .emul_path = NULL, 91 .interp_path = "/libexec/ld-elf.so.1", 92 .sysvec = &elf32_freebsd_sysvec, 93 .interp_newpath = NULL, 94 .brand_note = &elf32_freebsd_brandnote, 95 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 96 }; 97 98 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 99 (sysinit_cfunc_t) elf32_insert_brand_entry, 100 &freebsd_brand_info); 101 102 static Elf32_Brandinfo freebsd_brand_oinfo = { 103 .brand = ELFOSABI_FREEBSD, 104 .machine = EM_PPC, 105 .compat_3_brand = "FreeBSD", 106 .emul_path = NULL, 107 .interp_path = "/usr/libexec/ld-elf.so.1", 108 .sysvec = &elf32_freebsd_sysvec, 109 .interp_newpath = NULL, 110 .brand_note = &elf32_freebsd_brandnote, 111 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 112 }; 113 114 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 115 (sysinit_cfunc_t) elf32_insert_brand_entry, 116 &freebsd_brand_oinfo); 117 118 119 void 120 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 121 size_t *off __unused) 122 { 123 } 124 125 126 /* Process one elf relocation with addend. */ 127 static int 128 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 129 int type, int local, elf_lookup_fn lookup) 130 { 131 Elf_Addr *where; 132 Elf_Half *hwhere; 133 Elf_Addr addr; 134 Elf_Addr addend; 135 Elf_Word rtype, symidx; 136 const Elf_Rela *rela; 137 138 switch (type) { 139 case ELF_RELOC_REL: 140 panic("PPC only supports RELA relocations"); 141 break; 142 case ELF_RELOC_RELA: 143 rela = (const Elf_Rela *)data; 144 where = (Elf_Addr *) (relocbase + rela->r_offset); 145 hwhere = (Elf_Half *) (relocbase + rela->r_offset); 146 addend = rela->r_addend; 147 rtype = ELF_R_TYPE(rela->r_info); 148 symidx = ELF_R_SYM(rela->r_info); 149 break; 150 default: 151 panic("elf_reloc: unknown relocation mode %d\n", type); 152 } 153 154 switch (rtype) { 155 156 case R_PPC_NONE: 157 break; 158 159 case R_PPC_ADDR32: /* word32 S + A */ 160 addr = lookup(lf, symidx, 1); 161 if (addr == 0) 162 return -1; 163 addr += addend; 164 *where = addr; 165 break; 166 167 case R_PPC_ADDR16_LO: /* #lo(S) */ 168 addr = lookup(lf, symidx, 1); 169 if (addr == 0) 170 return -1; 171 /* 172 * addend values are sometimes relative to sections 173 * (i.e. .rodata) in rela, where in reality they 174 * are relative to relocbase. Detect this condition. 175 */ 176 if (addr > relocbase && addr <= (relocbase + addend)) 177 addr = relocbase + addend; 178 else 179 addr += addend; 180 *hwhere = addr & 0xffff; 181 break; 182 183 case R_PPC_ADDR16_HA: /* #ha(S) */ 184 addr = lookup(lf, symidx, 1); 185 if (addr == 0) 186 return -1; 187 /* 188 * addend values are sometimes relative to sections 189 * (i.e. .rodata) in rela, where in reality they 190 * are relative to relocbase. Detect this condition. 191 */ 192 if (addr > relocbase && addr <= (relocbase + addend)) 193 addr = relocbase + addend; 194 else 195 addr += addend; 196 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 197 & 0xffff; 198 break; 199 200 case R_PPC_RELATIVE: /* word32 B + A */ 201 *where = elf_relocaddr(lf, relocbase + addend); 202 break; 203 204 default: 205 printf("kldload: unexpected relocation type %d\n", 206 (int) rtype); 207 return -1; 208 } 209 return(0); 210 } 211 212 int 213 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 214 elf_lookup_fn lookup) 215 { 216 217 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 218 } 219 220 int 221 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 222 int type, elf_lookup_fn lookup) 223 { 224 225 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 226 } 227 228 int 229 elf_cpu_load_file(linker_file_t lf) 230 { 231 /* Only sync the cache for non-kernel modules */ 232 if (lf->id != 1) 233 __syncicache(lf->address, lf->size); 234 return (0); 235 } 236 237 int 238 elf_cpu_unload_file(linker_file_t lf __unused) 239 { 240 241 return (0); 242 }
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