elf32_machdep.c revision 291420
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/elf32_machdep.c 291420 2015-11-28 08:49:07Z 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/altivec.h> 51#include <machine/cpu.h> 52#include <machine/elf.h> 53#include <machine/reg.h> 54#include <machine/md_var.h> 55 56#ifdef __powerpc64__ 57#include <compat/freebsd32/freebsd32_proto.h> 58#include <compat/freebsd32/freebsd32_util.h> 59 60extern const char *freebsd32_syscallnames[]; 61#endif 62 63struct sysentvec elf32_freebsd_sysvec = { 64 .sv_size = SYS_MAXSYSCALL, 65#ifdef __powerpc64__ 66 .sv_table = freebsd32_sysent, 67#else 68 .sv_table = sysent, 69#endif 70 .sv_mask = 0, 71 .sv_errsize = 0, 72 .sv_errtbl = NULL, 73 .sv_transtrap = NULL, 74 .sv_fixup = __elfN(freebsd_fixup), 75 .sv_sendsig = sendsig, 76 .sv_sigcode = sigcode32, 77 .sv_szsigcode = &szsigcode32, 78 .sv_name = "FreeBSD ELF32", 79 .sv_coredump = __elfN(coredump), 80 .sv_imgact_try = NULL, 81 .sv_minsigstksz = MINSIGSTKSZ, 82 .sv_pagesize = PAGE_SIZE, 83 .sv_minuser = VM_MIN_ADDRESS, 84 .sv_stackprot = VM_PROT_ALL, 85#ifdef __powerpc64__ 86 .sv_maxuser = VM_MAXUSER_ADDRESS, 87 .sv_usrstack = FREEBSD32_USRSTACK, 88 .sv_psstrings = FREEBSD32_PS_STRINGS, 89 .sv_copyout_strings = freebsd32_copyout_strings, 90 .sv_setregs = ppc32_setregs, 91 .sv_syscallnames = freebsd32_syscallnames, 92#else 93 .sv_maxuser = VM_MAXUSER_ADDRESS, 94 .sv_usrstack = USRSTACK, 95 .sv_psstrings = PS_STRINGS, 96 .sv_copyout_strings = exec_copyout_strings, 97 .sv_setregs = exec_setregs, 98 .sv_syscallnames = syscallnames, 99#endif 100 .sv_fixlimit = NULL, 101 .sv_maxssiz = NULL, 102 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP, 103 .sv_set_syscall_retval = cpu_set_syscall_retval, 104 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 105 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 106 .sv_shared_page_len = PAGE_SIZE, 107 .sv_schedtail = NULL, 108 .sv_thread_detach = NULL, 109}; 110INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 111 112static Elf32_Brandinfo freebsd_brand_info = { 113 .brand = ELFOSABI_FREEBSD, 114 .machine = EM_PPC, 115 .compat_3_brand = "FreeBSD", 116 .emul_path = NULL, 117 .interp_path = "/libexec/ld-elf.so.1", 118 .sysvec = &elf32_freebsd_sysvec, 119#ifdef __powerpc64__ 120 .interp_newpath = "/libexec/ld-elf32.so.1", 121#else 122 .interp_newpath = NULL, 123#endif 124 .brand_note = &elf32_freebsd_brandnote, 125 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 126}; 127 128SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 129 (sysinit_cfunc_t) elf32_insert_brand_entry, 130 &freebsd_brand_info); 131 132static Elf32_Brandinfo freebsd_brand_oinfo = { 133 .brand = ELFOSABI_FREEBSD, 134 .machine = EM_PPC, 135 .compat_3_brand = "FreeBSD", 136 .emul_path = NULL, 137 .interp_path = "/usr/libexec/ld-elf.so.1", 138 .sysvec = &elf32_freebsd_sysvec, 139 .interp_newpath = NULL, 140 .brand_note = &elf32_freebsd_brandnote, 141 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 142}; 143 144SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 145 (sysinit_cfunc_t) elf32_insert_brand_entry, 146 &freebsd_brand_oinfo); 147 148void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 149 150void 151elf32_dump_thread(struct thread *td, void *dst, size_t *off) 152{ 153 size_t len; 154 struct pcb *pcb; 155 156 len = 0; 157 pcb = td->td_pcb; 158 if (pcb->pcb_flags & PCB_VEC) { 159 save_vec_nodrop(td); 160 if (dst != NULL) { 161 len += elf32_populate_note(NT_PPC_VMX, 162 &pcb->pcb_vec, dst, 163 sizeof(pcb->pcb_vec), NULL); 164 } else 165 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL, 166 sizeof(pcb->pcb_vec), NULL); 167 } 168 *off = len; 169} 170 171#ifndef __powerpc64__ 172/* Process one elf relocation with addend. */ 173static int 174elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 175 int type, int local, elf_lookup_fn lookup) 176{ 177 Elf_Addr *where; 178 Elf_Half *hwhere; 179 Elf_Addr addr; 180 Elf_Addr addend; 181 Elf_Word rtype, symidx; 182 const Elf_Rela *rela; 183 int error; 184 185 switch (type) { 186 case ELF_RELOC_REL: 187 panic("PPC only supports RELA relocations"); 188 break; 189 case ELF_RELOC_RELA: 190 rela = (const Elf_Rela *)data; 191 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset); 192 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset); 193 addend = rela->r_addend; 194 rtype = ELF_R_TYPE(rela->r_info); 195 symidx = ELF_R_SYM(rela->r_info); 196 break; 197 default: 198 panic("elf_reloc: unknown relocation mode %d\n", type); 199 } 200 201 switch (rtype) { 202 203 case R_PPC_NONE: 204 break; 205 206 case R_PPC_ADDR32: /* word32 S + A */ 207 error = lookup(lf, symidx, 1, &addr); 208 if (error != 0) 209 return -1; 210 *where = elf_relocaddr(lf, addr + addend); 211 break; 212 213 case R_PPC_ADDR16_LO: /* #lo(S) */ 214 error = lookup(lf, symidx, 1, &addr); 215 if (error != 0) 216 return -1; 217 /* 218 * addend values are sometimes relative to sections 219 * (i.e. .rodata) in rela, where in reality they 220 * are relative to relocbase. Detect this condition. 221 */ 222 if (addr > relocbase && addr <= (relocbase + addend)) 223 addr = relocbase; 224 addr = elf_relocaddr(lf, addr + addend); 225 *hwhere = addr & 0xffff; 226 break; 227 228 case R_PPC_ADDR16_HA: /* #ha(S) */ 229 error = lookup(lf, symidx, 1, &addr); 230 if (error != 0) 231 return -1; 232 /* 233 * addend values are sometimes relative to sections 234 * (i.e. .rodata) in rela, where in reality they 235 * are relative to relocbase. Detect this condition. 236 */ 237 if (addr > relocbase && addr <= (relocbase + addend)) 238 addr = relocbase; 239 addr = elf_relocaddr(lf, addr + addend); 240 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 241 & 0xffff; 242 break; 243 244 case R_PPC_RELATIVE: /* word32 B + A */ 245 *where = elf_relocaddr(lf, relocbase + addend); 246 break; 247 248 default: 249 printf("kldload: unexpected relocation type %d\n", 250 (int) rtype); 251 return -1; 252 } 253 return(0); 254} 255 256void 257elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 258{ 259 Elf_Rela *rela = 0, *relalim; 260 Elf_Addr relasz = 0; 261 Elf_Addr *where; 262 263 /* 264 * Extract the rela/relasz values from the dynamic section 265 */ 266 for (; dynp->d_tag != DT_NULL; dynp++) { 267 switch (dynp->d_tag) { 268 case DT_RELA: 269 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 270 break; 271 case DT_RELASZ: 272 relasz = dynp->d_un.d_val; 273 break; 274 } 275 } 276 277 /* 278 * Relocate these values 279 */ 280 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 281 for (; rela < relalim; rela++) { 282 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 283 continue; 284 where = (Elf_Addr *)(relocbase + rela->r_offset); 285 *where = (Elf_Addr)(relocbase + rela->r_addend); 286 } 287} 288 289int 290elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 291 elf_lookup_fn lookup) 292{ 293 294 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 295} 296 297int 298elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 299 int type, elf_lookup_fn lookup) 300{ 301 302 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 303} 304 305int 306elf_cpu_load_file(linker_file_t lf) 307{ 308 /* Only sync the cache for non-kernel modules */ 309 if (lf->id != 1) 310 __syncicache(lf->address, lf->size); 311 return (0); 312} 313 314int 315elf_cpu_unload_file(linker_file_t lf __unused) 316{ 317 318 return (0); 319} 320#endif 321