1 /* $NetBSD: kobj_machdep.c,v 1.8 2023/04/28 07:33:56 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /*- 30 * Copyright 1996-1998 John D. Polstra. 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 42 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 43 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 44 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 45 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 46 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 47 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 48 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 49 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 50 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 51 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 52 */ 53 54 #include <sys/cdefs.h> 55 __KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.8 2023/04/28 07:33:56 skrll Exp $"); 56 57 #define ELFSIZE ARCH_ELFSIZE 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/kobj.h> 62 #include <sys/exec.h> 63 #include <sys/exec_elf.h> 64 65 int 66 kobj_reloc(kobj_t ko, uintptr_t relocbase, const void *data, 67 bool isrela, bool local) 68 { 69 #ifdef _LP64 70 Elf64_Half *wwhere; 71 #endif 72 Elf_Addr *where; 73 Elf32_Half *hwhere; 74 Elf_Addr addr; 75 Elf_Sword addend; /* needs to be signed */ 76 u_int rtype, symidx; 77 const Elf_Rela *rela; 78 int error; 79 80 if (!isrela) { 81 panic("kobj_reloc: REL relocations not supported"); 82 } 83 84 rela = (const Elf_Rela *)data; 85 where = (Elf_Addr *) (relocbase + rela->r_offset); 86 hwhere = (Elf32_Half *) (relocbase + rela->r_offset); 87 #ifdef _LP64 88 wwhere = (Elf64_Half *) (relocbase + rela->r_offset); 89 #endif 90 addend = rela->r_addend; 91 rtype = ELF_R_TYPE(rela->r_info); 92 symidx = ELF_R_SYM(rela->r_info); 93 94 const Elf_Sym *sym = kobj_symbol(ko, symidx); 95 96 if (!local && ELF_ST_BIND(sym->st_info) == STB_LOCAL) { 97 return 0; 98 } 99 100 switch (rtype) { 101 case R_PPC_NONE: 102 break; 103 104 case R_PPC_RELATIVE: /* word32 B + A */ 105 addend += relocbase; /* A += B */ 106 break; 107 108 case R_PPC_REL32: /* word32 S + A - P */ 109 case R_PPC_REL16: /* half16* (S + A - P) */ 110 case R_PPC_REL16_LO: /* half16 #lo(S + A - P) */ 111 case R_PPC_REL16_HI: /* half16 #hi(S + A - P) */ 112 case R_PPC_REL16_HA: /* half16 #ha(S + A - P) */ 113 addend -= relocbase + rela->r_offset; /* A -= P */ 114 /* FALLTHROUGH */ 115 116 #ifdef _LP64 117 case R_PPC_ADDR64: /* doubleword64 S + A */ 118 #endif 119 case R_PPC_ADDR32: /* word32 S + A */ 120 case R_PPC_ADDR16: /* half16* S + A */ 121 case R_PPC_ADDR16_LO: /* half16 #lo(S + A) */ 122 case R_PPC_ADDR16_HA: /* half16 #ha(S + A) */ 123 case R_PPC_ADDR16_HI: /* half16 #hi(S + A) */ 124 error = kobj_sym_lookup(ko, symidx, &addr); 125 if (error) 126 return -1; 127 128 #if 0 129 /* 130 * addend values are sometimes relative to sections 131 * (i.e. .rodata) in rela, where in reality they 132 * are relative to relocbase. Detect this condition. 133 */ 134 if (addr > relocbase && addr <= (relocbase + addend)) 135 addr = relocbase + addend; 136 else 137 #endif 138 addend += addr; /* A += S */ 139 break; 140 141 default: 142 printf("kobj_reloc: unexpected relocation type %u\n", rtype); 143 return -1; 144 } 145 146 147 switch (rtype) { 148 case R_PPC_REL32: /* word32 S + A - P */ 149 #ifdef _LP64 150 *wwhere = addend; 151 break; 152 #endif 153 case R_PPC_RELATIVE: /* doubleword64/word32 B + A */ 154 case R_PPC_ADDR32: /* doubleword64/word32 S + A */ 155 *where = addend; 156 break; 157 158 case R_PPC_REL16: /* half16* (S + A - P) */ 159 case R_PPC_ADDR16: /* half16* S + A */ 160 if ((int16_t) addend != addend) 161 return -1; 162 /* FALLTHROUGH */ 163 case R_PPC_REL16_LO: /* half16 #lo(S + A - P) */ 164 case R_PPC_ADDR16_LO: /* half16 #lo(S + A) */ 165 *hwhere = addend & 0xffff; 166 break; 167 168 case R_PPC_REL16_HA: /* half16 #ha(S + A - P) */ 169 case R_PPC_ADDR16_HA: /* half16 #ha(S + A) */ 170 addend += 0x8000; 171 /* FALLTHROUGH */ 172 case R_PPC_REL16_HI: /* half16 #hi(S + A - P) */ 173 case R_PPC_ADDR16_HI: /* half16 #hi(S + A) */ 174 *hwhere = (addend >> 16) & 0xffff; 175 break; 176 } 177 178 return 0; 179 } 180 181 int 182 kobj_machdep(kobj_t ko, void *base, size_t size, bool load) 183 { 184 if (load) 185 __syncicache(base, size); 186 187 return 0; 188 } 189
Indexes created Sun Oct 25 00:26:45 UTC 2026