Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/freebsd32_machdep.c
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1 /*- 2 * Copyright (c) 2012 Juli Mallett <jmallett@FreeBSD.org> 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 AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Based on nwhitehorn's COMPAT_FREEBSD32 support code for PowerPC64. 31 */ 32 33 #include "opt_compat.h" 34 35 #define __ELF_WORD_SIZE 32 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/sysent.h> 42 #include <sys/exec.h> 43 #include <sys/imgact.h> 44 #include <sys/malloc.h> 45 #include <sys/proc.h> 46 #include <sys/namei.h> 47 #include <sys/fcntl.h> 48 #include <sys/sysent.h> 49 #include <sys/imgact_elf.h> 50 #include <sys/syscall.h> 51 #include <sys/syscallsubr.h> 52 #include <sys/sysproto.h> 53 #include <sys/signalvar.h> 54 #include <sys/vnode.h> 55 #include <sys/linker.h> 56 57 #include <vm/vm.h> 58 #include <vm/vm_param.h> 59 60 #include <machine/md_var.h> 61 #include <machine/reg.h> 62 #include <machine/sigframe.h> 63 #include <machine/sysarch.h> 64 65 #include <compat/freebsd32/freebsd32_signal.h> 66 #include <compat/freebsd32/freebsd32_util.h> 67 #include <compat/freebsd32/freebsd32_proto.h> 68 69 static void freebsd32_exec_setregs(struct thread *, struct image_params *, u_long); 70 static int get_mcontext32(struct thread *, mcontext32_t *, int); 71 static int set_mcontext32(struct thread *, mcontext32_t *); 72 static void freebsd32_sendsig(sig_t, ksiginfo_t *, sigset_t *); 73 74 extern const char *freebsd32_syscallnames[]; 75 76 struct sysentvec elf32_freebsd_sysvec = { 77 .sv_size = SYS_MAXSYSCALL, 78 .sv_table = freebsd32_sysent, 79 .sv_mask = 0, 80 .sv_errsize = 0, 81 .sv_errtbl = NULL, 82 .sv_transtrap = NULL, 83 .sv_fixup = __elfN(freebsd_fixup), 84 .sv_sendsig = freebsd32_sendsig, 85 .sv_sigcode = sigcode32, 86 .sv_szsigcode = &szsigcode32, 87 .sv_name = "FreeBSD ELF32", 88 .sv_coredump = __elfN(coredump), 89 .sv_imgact_try = NULL, 90 .sv_minsigstksz = MINSIGSTKSZ, 91 .sv_pagesize = PAGE_SIZE, 92 .sv_minuser = VM_MIN_ADDRESS, 93 .sv_maxuser = ((vm_offset_t)0x80000000), 94 .sv_usrstack = FREEBSD32_USRSTACK, 95 .sv_psstrings = FREEBSD32_PS_STRINGS, 96 .sv_stackprot = VM_PROT_ALL, 97 .sv_copyout_strings = freebsd32_copyout_strings, 98 .sv_setregs = freebsd32_exec_setregs, 99 .sv_fixlimit = NULL, 100 .sv_maxssiz = NULL, 101 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 102 .sv_set_syscall_retval = cpu_set_syscall_retval, 103 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 104 .sv_syscallnames = freebsd32_syscallnames, 105 .sv_schedtail = NULL, 106 .sv_thread_detach = NULL, 107 .sv_trap = NULL, 108 }; 109 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 110 111 static Elf32_Brandinfo freebsd_brand_info = { 112 .brand = ELFOSABI_FREEBSD, 113 .machine = EM_MIPS, 114 .compat_3_brand = "FreeBSD", 115 .emul_path = NULL, 116 .interp_path = "/libexec/ld-elf.so.1", 117 .sysvec = &elf32_freebsd_sysvec, 118 .interp_newpath = "/libexec/ld-elf32.so.1", 119 .flags = 0 120 }; 121 122 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 123 (sysinit_cfunc_t) elf32_insert_brand_entry, 124 &freebsd_brand_info); 125 126 static void 127 freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 128 { 129 exec_setregs(td, imgp, stack); 130 131 /* 132 * See comment in exec_setregs about running 32-bit binaries with 64-bit 133 * registers. 134 */ 135 td->td_frame->sp -= 65536; 136 137 /* 138 * Clear extended address space bit for userland. 139 */ 140 td->td_frame->sr &= ~MIPS_SR_UX; 141 } 142 143 int 144 set_regs32(struct thread *td, struct reg32 *regs) 145 { 146 struct reg r; 147 unsigned i; 148 149 for (i = 0; i < NUMSAVEREGS; i++) 150 r.r_regs[i] = regs->r_regs[i]; 151 152 return (set_regs(td, &r)); 153 } 154 155 int 156 fill_regs32(struct thread *td, struct reg32 *regs) 157 { 158 struct reg r; 159 unsigned i; 160 int error; 161 162 error = fill_regs(td, &r); 163 if (error != 0) 164 return (error); 165 166 for (i = 0; i < NUMSAVEREGS; i++) 167 regs->r_regs[i] = r.r_regs[i]; 168 169 return (0); 170 } 171 172 int 173 set_fpregs32(struct thread *td, struct fpreg32 *fpregs) 174 { 175 struct fpreg fp; 176 unsigned i; 177 178 for (i = 0; i < NUMFPREGS; i++) 179 fp.r_regs[i] = fpregs->r_regs[i]; 180 181 return (set_fpregs(td, &fp)); 182 } 183 184 int 185 fill_fpregs32(struct thread *td, struct fpreg32 *fpregs) 186 { 187 struct fpreg fp; 188 unsigned i; 189 int error; 190 191 error = fill_fpregs(td, &fp); 192 if (error != 0) 193 return (error); 194 195 for (i = 0; i < NUMFPREGS; i++) 196 fpregs->r_regs[i] = fp.r_regs[i]; 197 198 return (0); 199 } 200 201 static int 202 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags) 203 { 204 mcontext_t mcp64; 205 unsigned i; 206 int error; 207 208 error = get_mcontext(td, &mcp64, flags); 209 if (error != 0) 210 return (error); 211 212 mcp->mc_onstack = mcp64.mc_onstack; 213 mcp->mc_pc = mcp64.mc_pc; 214 for (i = 0; i < 32; i++) 215 mcp->mc_regs[i] = mcp64.mc_regs[i]; 216 mcp->sr = mcp64.sr; 217 mcp->mullo = mcp64.mullo; 218 mcp->mulhi = mcp64.mulhi; 219 mcp->mc_fpused = mcp64.mc_fpused; 220 for (i = 0; i < 33; i++) 221 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i]; 222 mcp->mc_fpc_eir = mcp64.mc_fpc_eir; 223 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls; 224 225 return (0); 226 } 227 228 static int 229 set_mcontext32(struct thread *td, mcontext32_t *mcp) 230 { 231 mcontext_t mcp64; 232 unsigned i; 233 234 mcp64.mc_onstack = mcp->mc_onstack; 235 mcp64.mc_pc = mcp->mc_pc; 236 for (i = 0; i < 32; i++) 237 mcp64.mc_regs[i] = mcp->mc_regs[i]; 238 mcp64.sr = mcp->sr; 239 mcp64.mullo = mcp->mullo; 240 mcp64.mulhi = mcp->mulhi; 241 mcp64.mc_fpused = mcp->mc_fpused; 242 for (i = 0; i < 33; i++) 243 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i]; 244 mcp64.mc_fpc_eir = mcp->mc_fpc_eir; 245 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls; 246 247 return (set_mcontext(td, &mcp64)); 248 } 249 250 int 251 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 252 { 253 ucontext32_t uc; 254 int error; 255 256 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 257 258 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 259 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 260 return (EFAULT); 261 } 262 263 error = set_mcontext32(td, &uc.uc_mcontext); 264 if (error != 0) 265 return (error); 266 267 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 268 269 #if 0 270 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 271 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 272 #endif 273 274 return (EJUSTRETURN); 275 } 276 277 /* 278 * The first two fields of a ucontext_t are the signal mask and the machine 279 * context. The next field is uc_link; we want to avoid destroying the link 280 * when copying out contexts. 281 */ 282 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link) 283 284 int 285 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 286 { 287 ucontext32_t uc; 288 int ret; 289 290 if (uap->ucp == NULL) 291 ret = EINVAL; 292 else { 293 bzero(&uc, sizeof(uc)); 294 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 295 PROC_LOCK(td->td_proc); 296 uc.uc_sigmask = td->td_sigmask; 297 PROC_UNLOCK(td->td_proc); 298 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE); 299 } 300 return (ret); 301 } 302 303 int 304 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 305 { 306 ucontext32_t uc; 307 int ret; 308 309 if (uap->ucp == NULL) 310 ret = EINVAL; 311 else { 312 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 313 if (ret == 0) { 314 ret = set_mcontext32(td, &uc.uc_mcontext); 315 if (ret == 0) { 316 kern_sigprocmask(td, SIG_SETMASK, 317 &uc.uc_sigmask, NULL, 0); 318 } 319 } 320 } 321 return (ret == 0 ? EJUSTRETURN : ret); 322 } 323 324 int 325 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 326 { 327 ucontext32_t uc; 328 int ret; 329 330 if (uap->oucp == NULL || uap->ucp == NULL) 331 ret = EINVAL; 332 else { 333 bzero(&uc, sizeof(uc)); 334 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 335 PROC_LOCK(td->td_proc); 336 uc.uc_sigmask = td->td_sigmask; 337 PROC_UNLOCK(td->td_proc); 338 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE); 339 if (ret == 0) { 340 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 341 if (ret == 0) { 342 ret = set_mcontext32(td, &uc.uc_mcontext); 343 if (ret == 0) { 344 kern_sigprocmask(td, SIG_SETMASK, 345 &uc.uc_sigmask, NULL, 0); 346 } 347 } 348 } 349 } 350 return (ret == 0 ? EJUSTRETURN : ret); 351 } 352 353 #define UCONTEXT_MAGIC 0xACEDBADE 354 355 /* 356 * Send an interrupt to process. 357 * 358 * Stack is set up to allow sigcode stored 359 * at top to call routine, followed by kcall 360 * to sigreturn routine below. After sigreturn 361 * resets the signal mask, the stack, and the 362 * frame pointer, it returns to the user 363 * specified pc, psl. 364 */ 365 static void 366 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 367 { 368 struct proc *p; 369 struct thread *td; 370 struct fpreg32 fpregs; 371 struct reg32 regs; 372 struct sigacts *psp; 373 struct sigframe32 sf, *sfp; 374 int sig; 375 int oonstack; 376 unsigned i; 377 378 td = curthread; 379 p = td->td_proc; 380 PROC_LOCK_ASSERT(p, MA_OWNED); 381 sig = ksi->ksi_signo; 382 psp = p->p_sigacts; 383 mtx_assert(&psp->ps_mtx, MA_OWNED); 384 385 fill_regs32(td, ®s); 386 oonstack = sigonstack(td->td_frame->sp); 387 388 /* save user context */ 389 bzero(&sf, sizeof sf); 390 sf.sf_uc.uc_sigmask = *mask; 391 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp; 392 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 393 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags; 394 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 395 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC]; 396 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO]; 397 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI]; 398 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls; 399 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */ 400 for (i = 1; i < 32; i++) 401 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i]; 402 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED; 403 if (sf.sf_uc.uc_mcontext.mc_fpused) { 404 /* if FPU has current state, save it first */ 405 if (td == PCPU_GET(fpcurthread)) 406 MipsSaveCurFPState(td); 407 fill_fpregs32(td, &fpregs); 408 for (i = 0; i < 33; i++) 409 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i]; 410 } 411 412 /* Allocate and validate space for the signal handler context. */ 413 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 414 SIGISMEMBER(psp->ps_sigonstack, sig)) { 415 sfp = (struct sigframe32 *)(((uintptr_t)td->td_sigstk.ss_sp + 416 td->td_sigstk.ss_size - sizeof(struct sigframe32)) 417 & ~(sizeof(__int64_t) - 1)); 418 } else 419 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp - 420 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1)); 421 422 /* Build the argument list for the signal handler. */ 423 td->td_frame->a0 = sig; 424 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc; 425 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 426 /* Signal handler installed with SA_SIGINFO. */ 427 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si; 428 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */ 429 430 /* fill siginfo structure */ 431 sf.sf_si.si_signo = sig; 432 sf.sf_si.si_code = ksi->ksi_code; 433 sf.sf_si.si_addr = td->td_frame->badvaddr; 434 } else { 435 /* Old FreeBSD-style arguments. */ 436 td->td_frame->a1 = ksi->ksi_code; 437 td->td_frame->a3 = td->td_frame->badvaddr; 438 /* sf.sf_ahu.sf_handler = catcher; */ 439 } 440 441 mtx_unlock(&psp->ps_mtx); 442 PROC_UNLOCK(p); 443 444 /* 445 * Copy the sigframe out to the user's stack. 446 */ 447 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) { 448 /* 449 * Something is wrong with the stack pointer. 450 * ...Kill the process. 451 */ 452 PROC_LOCK(p); 453 sigexit(td, SIGILL); 454 } 455 456 td->td_frame->pc = (register_t)(intptr_t)catcher; 457 td->td_frame->t9 = (register_t)(intptr_t)catcher; 458 td->td_frame->sp = (register_t)(intptr_t)sfp; 459 /* 460 * Signal trampoline code is at base of user stack. 461 */ 462 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 463 PROC_LOCK(p); 464 mtx_lock(&psp->ps_mtx); 465 } 466 467 int 468 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 469 { 470 int error; 471 int32_t tlsbase; 472 473 switch (uap->op) { 474 case MIPS_SET_TLS: 475 td->td_md.md_tls = (void *)(intptr_t)uap->parms; 476 return (0); 477 case MIPS_GET_TLS: 478 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls; 479 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase)); 480 return (error); 481 default: 482 break; 483 } 484 return (EINVAL); 485 } 486 487 void 488 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 489 size_t *off __unused) 490 { 491 }
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