elf32_machdep.c revision 288289
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: stable/10/sys/powerpc/powerpc/elf32_machdep.c 288289 2015-09-27 01:37:30Z kib $ 26 */ 27 28#include <sys/param.h> 29#include <sys/kernel.h> 30#include <sys/systm.h> 31 32#define __ELF_WORD_SIZE 32 33 34#include <sys/exec.h> 35#include <sys/imgact.h> 36#include <sys/malloc.h> 37#include <sys/proc.h> 38#include <sys/namei.h> 39#include <sys/fcntl.h> 40#include <sys/sysent.h> 41#include <sys/imgact_elf.h> 42#include <sys/syscall.h> 43#include <sys/signalvar.h> 44#include <sys/vnode.h> 45#include <sys/linker.h> 46 47#include <vm/vm.h> 48#include <vm/vm_param.h> 49 50#include <machine/cpu.h> 51#include <machine/elf.h> 52#include <machine/reg.h> 53#include <machine/md_var.h> 54 55#ifdef __powerpc64__ 56#include <compat/freebsd32/freebsd32_proto.h> 57#include <compat/freebsd32/freebsd32_util.h> 58 59extern const char *freebsd32_syscallnames[]; 60#endif 61 62struct sysentvec elf32_freebsd_sysvec = { 63 .sv_size = SYS_MAXSYSCALL, 64#ifdef __powerpc64__ 65 .sv_table = freebsd32_sysent, 66#else 67 .sv_table = sysent, 68#endif 69 .sv_mask = 0, 70 .sv_sigsize = 0, 71 .sv_sigtbl = NULL, 72 .sv_errsize = 0, 73 .sv_errtbl = NULL, 74 .sv_transtrap = NULL, 75 .sv_fixup = __elfN(freebsd_fixup), 76 .sv_sendsig = sendsig, 77 .sv_sigcode = sigcode32, 78 .sv_szsigcode = &szsigcode32, 79 .sv_prepsyscall = NULL, 80 .sv_name = "FreeBSD ELF32", 81 .sv_coredump = __elfN(coredump), 82 .sv_imgact_try = NULL, 83 .sv_minsigstksz = MINSIGSTKSZ, 84 .sv_pagesize = PAGE_SIZE, 85 .sv_minuser = VM_MIN_ADDRESS, 86 .sv_stackprot = VM_PROT_ALL, 87#ifdef __powerpc64__ 88 .sv_maxuser = VM_MAXUSER_ADDRESS, 89 .sv_usrstack = FREEBSD32_USRSTACK, 90 .sv_psstrings = FREEBSD32_PS_STRINGS, 91 .sv_copyout_strings = freebsd32_copyout_strings, 92 .sv_setregs = ppc32_setregs, 93 .sv_syscallnames = freebsd32_syscallnames, 94#else 95 .sv_maxuser = VM_MAXUSER_ADDRESS, 96 .sv_usrstack = USRSTACK, 97 .sv_psstrings = PS_STRINGS, 98 .sv_copyout_strings = exec_copyout_strings, 99 .sv_setregs = exec_setregs, 100 .sv_syscallnames = syscallnames, 101#endif 102 .sv_fixlimit = NULL, 103 .sv_maxssiz = NULL, 104 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP, 105 .sv_set_syscall_retval = cpu_set_syscall_retval, 106 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 107 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 108 .sv_shared_page_len = PAGE_SIZE, 109 .sv_schedtail = NULL, 110}; 111INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 112 113static Elf32_Brandinfo freebsd_brand_info = { 114 .brand = ELFOSABI_FREEBSD, 115 .machine = EM_PPC, 116 .compat_3_brand = "FreeBSD", 117 .emul_path = NULL, 118 .interp_path = "/libexec/ld-elf.so.1", 119 .sysvec = &elf32_freebsd_sysvec, 120#ifdef __powerpc64__ 121 .interp_newpath = "/libexec/ld-elf32.so.1", 122#else 123 .interp_newpath = NULL, 124#endif 125 .brand_note = &elf32_freebsd_brandnote, 126 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 127}; 128 129SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 130 (sysinit_cfunc_t) elf32_insert_brand_entry, 131 &freebsd_brand_info); 132 133static Elf32_Brandinfo freebsd_brand_oinfo = { 134 .brand = ELFOSABI_FREEBSD, 135 .machine = EM_PPC, 136 .compat_3_brand = "FreeBSD", 137 .emul_path = NULL, 138 .interp_path = "/usr/libexec/ld-elf.so.1", 139 .sysvec = &elf32_freebsd_sysvec, 140 .interp_newpath = NULL, 141 .brand_note = &elf32_freebsd_brandnote, 142 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 143}; 144 145SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 146 (sysinit_cfunc_t) elf32_insert_brand_entry, 147 &freebsd_brand_oinfo); 148 149void 150elf32_dump_thread(struct thread *td __unused, void *dst __unused, 151 size_t *off __unused) 152{ 153} 154 155#ifndef __powerpc64__ 156/* Process one elf relocation with addend. */ 157static int 158elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 159 int type, int local, elf_lookup_fn lookup) 160{ 161 Elf_Addr *where; 162 Elf_Half *hwhere; 163 Elf_Addr addr; 164 Elf_Addr addend; 165 Elf_Word rtype, symidx; 166 const Elf_Rela *rela; 167 int error; 168 169 switch (type) { 170 case ELF_RELOC_REL: 171 panic("PPC only supports RELA relocations"); 172 break; 173 case ELF_RELOC_RELA: 174 rela = (const Elf_Rela *)data; 175 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset); 176 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset); 177 addend = rela->r_addend; 178 rtype = ELF_R_TYPE(rela->r_info); 179 symidx = ELF_R_SYM(rela->r_info); 180 break; 181 default: 182 panic("elf_reloc: unknown relocation mode %d\n", type); 183 } 184 185 switch (rtype) { 186 187 case R_PPC_NONE: 188 break; 189 190 case R_PPC_ADDR32: /* word32 S + A */ 191 error = lookup(lf, symidx, 1, &addr); 192 if (error != 0) 193 return -1; 194 addr += addend; 195 *where = addr; 196 break; 197 198 case R_PPC_ADDR16_LO: /* #lo(S) */ 199 error = lookup(lf, symidx, 1, &addr); 200 if (error != 0) 201 return -1; 202 /* 203 * addend values are sometimes relative to sections 204 * (i.e. .rodata) in rela, where in reality they 205 * are relative to relocbase. Detect this condition. 206 */ 207 if (addr > relocbase && addr <= (relocbase + addend)) 208 addr = relocbase + addend; 209 else 210 addr += addend; 211 *hwhere = addr & 0xffff; 212 break; 213 214 case R_PPC_ADDR16_HA: /* #ha(S) */ 215 error = lookup(lf, symidx, 1, &addr); 216 if (error != 0) 217 return -1; 218 /* 219 * addend values are sometimes relative to sections 220 * (i.e. .rodata) in rela, where in reality they 221 * are relative to relocbase. Detect this condition. 222 */ 223 if (addr > relocbase && addr <= (relocbase + addend)) 224 addr = relocbase + addend; 225 else 226 addr += addend; 227 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 228 & 0xffff; 229 break; 230 231 case R_PPC_RELATIVE: /* word32 B + A */ 232 *where = elf_relocaddr(lf, relocbase + addend); 233 break; 234 235 default: 236 printf("kldload: unexpected relocation type %d\n", 237 (int) rtype); 238 return -1; 239 } 240 return(0); 241} 242 243int 244elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 245 elf_lookup_fn lookup) 246{ 247 248 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 249} 250 251int 252elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 253 int type, elf_lookup_fn lookup) 254{ 255 256 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 257} 258 259int 260elf_cpu_load_file(linker_file_t lf) 261{ 262 /* Only sync the cache for non-kernel modules */ 263 if (lf->id != 1) 264 __syncicache(lf->address, lf->size); 265 return (0); 266} 267 268int 269elf_cpu_unload_file(linker_file_t lf __unused) 270{ 271 272 return (0); 273} 274#endif 275