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/7.4/sys/powerpc/powerpc/elf_machdep.c 191210 2009-04-17 16:42:57Z 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 }; 80 81 static Elf32_Brandinfo freebsd_brand_info = { 82 .brand = ELFOSABI_FREEBSD, 83 .machine = EM_PPC, 84 .compat_3_brand = "FreeBSD", 85 .emul_path = NULL, 86 .interp_path = "/libexec/ld-elf.so.1", 87 .sysvec = &elf32_freebsd_sysvec, 88 .interp_newpath = NULL, 89 .brand_note = &elf32_freebsd_brandnote, 90 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 91 }; 92 93 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, 94 (sysinit_cfunc_t) elf32_insert_brand_entry, 95 &freebsd_brand_info); 96 97 static 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 .brand_note = &elf32_freebsd_brandnote, 106 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 107 }; 108 109 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 110 (sysinit_cfunc_t) elf32_insert_brand_entry, 111 &freebsd_brand_oinfo); 112 113 114 void 115 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 116 size_t *off __unused) 117 { 118 } 119 120 121 /* Process one elf relocation with addend. */ 122 static int 123 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 124 int type, int local, elf_lookup_fn lookup) 125 { 126 Elf_Addr *where; 127 Elf_Half *hwhere; 128 Elf_Addr addr; 129 Elf_Addr addend; 130 Elf_Word rtype, symidx; 131 const Elf_Rela *rela; 132 133 switch (type) { 134 case ELF_RELOC_REL: 135 panic("PPC only supports RELA relocations"); 136 break; 137 case ELF_RELOC_RELA: 138 rela = (const Elf_Rela *)data; 139 where = (Elf_Addr *) (relocbase + rela->r_offset); 140 hwhere = (Elf_Half *) (relocbase + rela->r_offset); 141 addend = rela->r_addend; 142 rtype = ELF_R_TYPE(rela->r_info); 143 symidx = ELF_R_SYM(rela->r_info); 144 break; 145 default: 146 panic("elf_reloc: unknown relocation mode %d\n", type); 147 } 148 149 switch (rtype) { 150 151 case R_PPC_NONE: 152 break; 153 154 case R_PPC_ADDR32: /* word32 S + A */ 155 addr = lookup(lf, symidx, 1); 156 if (addr == 0) 157 return -1; 158 addr += addend; 159 *where = addr; 160 break; 161 162 case R_PPC_ADDR16_LO: /* #lo(S) */ 163 addr = lookup(lf, symidx, 1); 164 if (addr == 0) 165 return -1; 166 /* 167 * addend values are sometimes relative to sections 168 * (i.e. .rodata) in rela, where in reality they 169 * are relative to relocbase. Detect this condition. 170 */ 171 if (addr > relocbase && addr <= (relocbase + addend)) 172 addr = relocbase + addend; 173 else 174 addr += addend; 175 *hwhere = addr & 0xffff; 176 break; 177 178 case R_PPC_ADDR16_HA: /* #ha(S) */ 179 addr = lookup(lf, symidx, 1); 180 if (addr == 0) 181 return -1; 182 /* 183 * addend values are sometimes relative to sections 184 * (i.e. .rodata) in rela, where in reality they 185 * are relative to relocbase. Detect this condition. 186 */ 187 if (addr > relocbase && addr <= (relocbase + addend)) 188 addr = relocbase + addend; 189 else 190 addr += addend; 191 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 192 & 0xffff; 193 break; 194 195 case R_PPC_RELATIVE: /* word32 B + A */ 196 *where = relocbase + addend; 197 break; 198 199 default: 200 printf("kldload: unexpected relocation type %d\n", 201 (int) rtype); 202 return -1; 203 } 204 return(0); 205 } 206 207 int 208 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 209 elf_lookup_fn lookup) 210 { 211 212 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 213 } 214 215 int 216 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 217 int type, elf_lookup_fn lookup) 218 { 219 220 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 221 } 222 223 int 224 elf_cpu_load_file(linker_file_t lf) 225 { 226 /* Only sync the cache for non-kernel modules */ 227 if (lf->id != 1) 228 __syncicache(lf->address, lf->size); 229 return (0); 230 } 231 232 int 233 elf_cpu_unload_file(linker_file_t lf __unused) 234 { 235 236 return (0); 237 }
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