elf32_machdep.c revision 119015
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: head/sys/powerpc/powerpc/elf_machdep.c 119015 2003-08-17 08:08:38Z gordon $ 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/elf.h> 48#include <machine/md_var.h> 49 50struct sysentvec elf32_freebsd_sysvec = { 51 SYS_MAXSYSCALL, 52 sysent, 53 0, 54 0, 55 NULL, 56 0, 57 NULL, 58 NULL, 59 __elfN(freebsd_fixup), 60 sendsig, 61 sigcode, 62 &szsigcode, 63 NULL, 64 "FreeBSD ELF32", 65 __elfN(coredump), 66 NULL, 67 MINSIGSTKSZ, 68 PAGE_SIZE, 69 VM_MIN_ADDRESS, 70 VM_MAXUSER_ADDRESS, 71 USRSTACK, 72 PS_STRINGS, 73 VM_PROT_ALL, 74 exec_copyout_strings, 75 exec_setregs 76}; 77 78static Elf32_Brandinfo freebsd_brand_info = { 79 ELFOSABI_FREEBSD, 80 EM_PPC, 81 "FreeBSD", 82 "", 83 "/libexec/ld-elf.so.1", 84 &elf32_freebsd_sysvec 85 }; 86 87SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, 88 (sysinit_cfunc_t) elf32_insert_brand_entry, 89 &freebsd_brand_info); 90 91/* Process one elf relocation with addend. */ 92static int 93elf_reloc_internal(linker_file_t lf, const void *data, int type, int local) 94{ 95 Elf_Addr relocbase = (Elf_Addr) lf->address; 96 Elf_Addr *where; 97 Elf_Addr addr; 98 Elf_Addr addend; 99 Elf_Word rtype, symidx; 100 const Elf_Rel *rel; 101 const Elf_Rela *rela; 102 103 switch (type) { 104 case ELF_RELOC_REL: 105 rel = (const Elf_Rel *)data; 106 where = (Elf_Addr *) (relocbase + rel->r_offset); 107 addend = *where; 108 rtype = ELF_R_TYPE(rel->r_info); 109 symidx = ELF_R_SYM(rel->r_info); 110 break; 111 case ELF_RELOC_RELA: 112 rela = (const Elf_Rela *)data; 113 where = (Elf_Addr *) (relocbase + rela->r_offset); 114 addend = rela->r_addend; 115 rtype = ELF_R_TYPE(rela->r_info); 116 symidx = ELF_R_SYM(rela->r_info); 117 break; 118 default: 119 panic("elf_reloc: unknown relocation mode %d\n", type); 120 } 121 122 switch (rtype) { 123 124 case R_PPC_NONE: 125 break; 126 127 case R_PPC_GLOB_DAT: 128 addr = elf_lookup(lf, symidx, 1); 129 if (addr == 0) 130 return -1; 131 addr += addend; 132 if (*where != addr) 133 *where = addr; 134 break; 135 136 case R_PPC_JMP_SLOT: 137 /* No point in lazy binding for kernel modules. */ 138 addr = elf_lookup(lf, symidx, 1); 139 if (addr == 0) 140 return -1; 141 if (*where != addr) 142 *where = addr; 143 break; 144 145 case R_PPC_RELATIVE: 146 addr = relocbase + addend + *where; 147 if (*where != addr) 148 *where = addr; 149 break; 150 151 case R_PPC_COPY: 152 /* 153 * There shouldn't be copy relocations in kernel 154 * objects. 155 */ 156 printf("kldload: unexpected R_COPY relocation\n"); 157 return -1; 158 159 default: 160 printf("kldload: unexpected relocation type %d\n", 161 (int) rtype); 162 return -1; 163 } 164 return(0); 165} 166 167int 168elf_reloc(linker_file_t lf, const void *data, int type) 169{ 170 171 return (elf_reloc_internal(lf, data, type, 0)); 172} 173 174int 175elf_reloc_local(linker_file_t lf, const void *data, int type) 176{ 177 178 return (elf_reloc_internal(lf, data, type, 1)); 179} 180 181int 182elf_cpu_load_file(linker_file_t lf __unused) 183{ 184 185 return (0); 186} 187 188int 189elf_cpu_unload_file(linker_file_t lf __unused) 190{ 191 192 return (0); 193} 194