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 69static void freebsd32_exec_setregs(struct thread *, struct image_params *, u_long); 70static int get_mcontext32(struct thread *, mcontext32_t *, int); 71static int set_mcontext32(struct thread *, const mcontext32_t *); 72static void freebsd32_sendsig(sig_t, ksiginfo_t *, sigset_t *); 73 74extern const char *freebsd32_syscallnames[]; 75 76struct sysentvec elf32_freebsd_sysvec = { 77 .sv_size = SYS_MAXSYSCALL, 78 .sv_table = freebsd32_sysent, 79 .sv_mask = 0, 80 .sv_sigsize = 0, 81 .sv_sigtbl = NULL, 82 .sv_errsize = 0, 83 .sv_errtbl = NULL, 84 .sv_transtrap = NULL, 85 .sv_fixup = __elfN(freebsd_fixup), 86 .sv_sendsig = freebsd32_sendsig, 87 .sv_sigcode = sigcode32, 88 .sv_szsigcode = &szsigcode32, 89 .sv_prepsyscall = NULL, 90 .sv_name = "FreeBSD ELF32", 91 .sv_coredump = __elfN(coredump), 92 .sv_imgact_try = NULL, 93 .sv_minsigstksz = MINSIGSTKSZ, 94 .sv_pagesize = PAGE_SIZE, 95 .sv_minuser = VM_MIN_ADDRESS, 96 .sv_maxuser = ((vm_offset_t)0x80000000), 97 .sv_usrstack = FREEBSD32_USRSTACK, 98 .sv_psstrings = FREEBSD32_PS_STRINGS, 99 .sv_stackprot = VM_PROT_ALL, 100 .sv_copyout_strings = freebsd32_copyout_strings, 101 .sv_setregs = freebsd32_exec_setregs, 102 .sv_fixlimit = NULL, 103 .sv_maxssiz = NULL, 104 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 105 .sv_set_syscall_retval = cpu_set_syscall_retval, 106 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 107 .sv_syscallnames = freebsd32_syscallnames, 108 .sv_schedtail = NULL, 109}; 110INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 111 112static Elf32_Brandinfo freebsd_brand_info = { 113 .brand = ELFOSABI_FREEBSD, 114 .machine = EM_MIPS, 115 .compat_3_brand = "FreeBSD", 116 .emul_path = NULL, 117 .interp_path = "/libexec/ld-elf.so.1", 118 .sysvec = &elf32_freebsd_sysvec, 119 .interp_newpath = "/libexec/ld-elf32.so.1", 120 .flags = 0 121}; 122 123SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 124 (sysinit_cfunc_t) elf32_insert_brand_entry, 125 &freebsd_brand_info); 126 127static void 128freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 129{ 130 exec_setregs(td, imgp, stack); 131 132 /* 133 * See comment in exec_setregs about running 32-bit binaries with 64-bit 134 * registers. 135 */ 136 td->td_frame->sp -= 65536; 137 138 /* 139 * Clear extended address space bit for userland. 140 */ 141 td->td_frame->sr &= ~MIPS_SR_UX; 142} 143 144int 145set_regs32(struct thread *td, struct reg32 *regs) 146{ 147 struct reg r; 148 unsigned i; 149 150 for (i = 0; i < NUMSAVEREGS; i++) 151 r.r_regs[i] = regs->r_regs[i]; 152 153 return (set_regs(td, &r)); 154} 155 156int 157fill_regs32(struct thread *td, struct reg32 *regs) 158{ 159 struct reg r; 160 unsigned i; 161 int error; 162 163 error = fill_regs(td, &r); 164 if (error != 0) 165 return (error); 166 167 for (i = 0; i < NUMSAVEREGS; i++) 168 regs->r_regs[i] = r.r_regs[i]; 169 170 return (0); 171} 172 173int 174set_fpregs32(struct thread *td, struct fpreg32 *fpregs) 175{ 176 struct fpreg fp; 177 unsigned i; 178 179 for (i = 0; i < NUMFPREGS; i++) 180 fp.r_regs[i] = fpregs->r_regs[i]; 181 182 return (set_fpregs(td, &fp)); 183} 184 185int 186fill_fpregs32(struct thread *td, struct fpreg32 *fpregs) 187{ 188 struct fpreg fp; 189 unsigned i; 190 int error; 191 192 error = fill_fpregs(td, &fp); 193 if (error != 0) 194 return (error); 195 196 for (i = 0; i < NUMFPREGS; i++) 197 fpregs->r_regs[i] = fp.r_regs[i]; 198 199 return (0); 200} 201 202static int 203get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags) 204{ 205 mcontext_t mcp64; 206 unsigned i; 207 int error; 208 209 error = get_mcontext(td, &mcp64, flags); 210 if (error != 0) 211 return (error); 212 213 mcp->mc_onstack = mcp64.mc_onstack; 214 mcp->mc_pc = mcp64.mc_pc; 215 for (i = 0; i < 32; i++) 216 mcp->mc_regs[i] = mcp64.mc_regs[i]; 217 mcp->sr = mcp64.sr; 218 mcp->mullo = mcp64.mullo; 219 mcp->mulhi = mcp64.mulhi; 220 mcp->mc_fpused = mcp64.mc_fpused; 221 for (i = 0; i < 33; i++) 222 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i]; 223 mcp->mc_fpc_eir = mcp64.mc_fpc_eir; 224 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls; 225 226 return (0); 227} 228 229static int 230set_mcontext32(struct thread *td, const mcontext32_t *mcp) 231{ 232 mcontext_t mcp64; 233 unsigned i; 234 235 mcp64.mc_onstack = mcp->mc_onstack; 236 mcp64.mc_pc = mcp->mc_pc; 237 for (i = 0; i < 32; i++) 238 mcp64.mc_regs[i] = mcp->mc_regs[i]; 239 mcp64.sr = mcp->sr; 240 mcp64.mullo = mcp->mullo; 241 mcp64.mulhi = mcp->mulhi; 242 mcp64.mc_fpused = mcp->mc_fpused; 243 for (i = 0; i < 33; i++) 244 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i]; 245 mcp64.mc_fpc_eir = mcp->mc_fpc_eir; 246 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls; 247 248 return (set_mcontext(td, &mcp64)); 249} 250 251int 252freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 253{ 254 ucontext32_t uc; 255 int error; 256 257 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 258 259 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 260 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 261 return (EFAULT); 262 } 263 264 error = set_mcontext32(td, &uc.uc_mcontext); 265 if (error != 0) 266 return (error); 267 268 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 269 270#if 0 271 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 272 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 273#endif 274 275 return (EJUSTRETURN); 276} 277 278/* 279 * The first two fields of a ucontext_t are the signal mask and the machine 280 * context. The next field is uc_link; we want to avoid destroying the link 281 * when copying out contexts. 282 */ 283#define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link) 284 285int 286freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 287{ 288 ucontext32_t uc; 289 int ret; 290 291 if (uap->ucp == NULL) 292 ret = EINVAL; 293 else { 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 303int 304freebsd32_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 324int 325freebsd32_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 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 334 PROC_LOCK(td->td_proc); 335 uc.uc_sigmask = td->td_sigmask; 336 PROC_UNLOCK(td->td_proc); 337 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE); 338 if (ret == 0) { 339 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 340 if (ret == 0) { 341 ret = set_mcontext32(td, &uc.uc_mcontext); 342 if (ret == 0) { 343 kern_sigprocmask(td, SIG_SETMASK, 344 &uc.uc_sigmask, NULL, 0); 345 } 346 } 347 } 348 } 349 return (ret == 0 ? EJUSTRETURN : ret); 350} 351 352#define UCONTEXT_MAGIC 0xACEDBADE 353 354/* 355 * Send an interrupt to process. 356 * 357 * Stack is set up to allow sigcode stored 358 * at top to call routine, followed by kcall 359 * to sigreturn routine below. After sigreturn 360 * resets the signal mask, the stack, and the 361 * frame pointer, it returns to the user 362 * specified pc, psl. 363 */ 364static void 365freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 366{ 367 struct proc *p; 368 struct thread *td; 369 struct fpreg32 fpregs; 370 struct reg32 regs; 371 struct sigacts *psp; 372 struct sigframe32 sf, *sfp; 373 int sig; 374 int oonstack; 375 unsigned i; 376 377 td = curthread; 378 p = td->td_proc; 379 PROC_LOCK_ASSERT(p, MA_OWNED); 380 sig = ksi->ksi_signo; 381 psp = p->p_sigacts; 382 mtx_assert(&psp->ps_mtx, MA_OWNED); 383 384 fill_regs32(td, ®s); 385 oonstack = sigonstack(td->td_frame->sp); 386 387 /* save user context */ 388 bzero(&sf, sizeof sf); 389 sf.sf_uc.uc_sigmask = *mask; 390 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp; 391 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 392 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags; 393 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 394 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC]; 395 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO]; 396 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI]; 397 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls; 398 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */ 399 for (i = 1; i < 32; i++) 400 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i]; 401 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED; 402 if (sf.sf_uc.uc_mcontext.mc_fpused) { 403 /* if FPU has current state, save it first */ 404 if (td == PCPU_GET(fpcurthread)) 405 MipsSaveCurFPState(td); 406 fill_fpregs32(td, &fpregs); 407 for (i = 0; i < 33; i++) 408 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i]; 409 } 410 411 /* Allocate and validate space for the signal handler context. */ 412 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 413 SIGISMEMBER(psp->ps_sigonstack, sig)) { 414 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_sigstk.ss_sp + 415 td->td_sigstk.ss_size - sizeof(struct sigframe32)) 416 & ~(sizeof(__int64_t) - 1)); 417 } else 418 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp - 419 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1)); 420 421 /* Translate the signal if appropriate */ 422 if (p->p_sysent->sv_sigtbl) { 423 if (sig <= p->p_sysent->sv_sigsize) 424 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 425 } 426 427 /* Build the argument list for the signal handler. */ 428 td->td_frame->a0 = sig; 429 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc; 430 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 431 /* Signal handler installed with SA_SIGINFO. */ 432 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si; 433 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */ 434 435 /* fill siginfo structure */ 436 sf.sf_si.si_signo = sig; 437 sf.sf_si.si_code = ksi->ksi_code; 438 sf.sf_si.si_addr = td->td_frame->badvaddr; 439 } else { 440 /* Old FreeBSD-style arguments. */ 441 td->td_frame->a1 = ksi->ksi_code; 442 td->td_frame->a3 = td->td_frame->badvaddr; 443 /* sf.sf_ahu.sf_handler = catcher; */ 444 } 445 446 mtx_unlock(&psp->ps_mtx); 447 PROC_UNLOCK(p); 448 449 /* 450 * Copy the sigframe out to the user's stack. 451 */ 452 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) { 453 /* 454 * Something is wrong with the stack pointer. 455 * ...Kill the process. 456 */ 457 PROC_LOCK(p); 458 sigexit(td, SIGILL); 459 } 460 461 td->td_frame->pc = (register_t)(intptr_t)catcher; 462 td->td_frame->t9 = (register_t)(intptr_t)catcher; 463 td->td_frame->sp = (register_t)(intptr_t)sfp; 464 /* 465 * Signal trampoline code is at base of user stack. 466 */ 467 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 468 PROC_LOCK(p); 469 mtx_lock(&psp->ps_mtx); 470} 471 472int 473freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 474{ 475 int error; 476 int32_t tlsbase; 477 478 switch (uap->op) { 479 case MIPS_SET_TLS: 480 td->td_md.md_tls = (void *)(intptr_t)uap->parms; 481 return (0); 482 case MIPS_GET_TLS: 483 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls; 484 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase)); 485 return (error); 486 default: 487 break; 488 } 489 return (EINVAL); 490} 491 492void 493elf32_dump_thread(struct thread *td __unused, void *dst __unused, 494 size_t *off __unused) 495{ 496} 497