freebsd32_machdep.c revision 283382
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: head/sys/mips/mips/freebsd32_machdep.c 283382 2015-05-24 14:51:29Z dchagin $ 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 *, 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 .sv_thread_detach = NULL, 110}; 111INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 112 113static Elf32_Brandinfo freebsd_brand_info = { 114 .brand = ELFOSABI_FREEBSD, 115 .machine = EM_MIPS, 116 .compat_3_brand = "FreeBSD", 117 .emul_path = NULL, 118 .interp_path = "/libexec/ld-elf.so.1", 119 .sysvec = &elf32_freebsd_sysvec, 120 .interp_newpath = "/libexec/ld-elf32.so.1", 121 .flags = 0 122}; 123 124SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 125 (sysinit_cfunc_t) elf32_insert_brand_entry, 126 &freebsd_brand_info); 127 128static void 129freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 130{ 131 exec_setregs(td, imgp, stack); 132 133 /* 134 * See comment in exec_setregs about running 32-bit binaries with 64-bit 135 * registers. 136 */ 137 td->td_frame->sp -= 65536; 138 139 /* 140 * Clear extended address space bit for userland. 141 */ 142 td->td_frame->sr &= ~MIPS_SR_UX; 143} 144 145int 146set_regs32(struct thread *td, struct reg32 *regs) 147{ 148 struct reg r; 149 unsigned i; 150 151 for (i = 0; i < NUMSAVEREGS; i++) 152 r.r_regs[i] = regs->r_regs[i]; 153 154 return (set_regs(td, &r)); 155} 156 157int 158fill_regs32(struct thread *td, struct reg32 *regs) 159{ 160 struct reg r; 161 unsigned i; 162 int error; 163 164 error = fill_regs(td, &r); 165 if (error != 0) 166 return (error); 167 168 for (i = 0; i < NUMSAVEREGS; i++) 169 regs->r_regs[i] = r.r_regs[i]; 170 171 return (0); 172} 173 174int 175set_fpregs32(struct thread *td, struct fpreg32 *fpregs) 176{ 177 struct fpreg fp; 178 unsigned i; 179 180 for (i = 0; i < NUMFPREGS; i++) 181 fp.r_regs[i] = fpregs->r_regs[i]; 182 183 return (set_fpregs(td, &fp)); 184} 185 186int 187fill_fpregs32(struct thread *td, struct fpreg32 *fpregs) 188{ 189 struct fpreg fp; 190 unsigned i; 191 int error; 192 193 error = fill_fpregs(td, &fp); 194 if (error != 0) 195 return (error); 196 197 for (i = 0; i < NUMFPREGS; i++) 198 fpregs->r_regs[i] = fp.r_regs[i]; 199 200 return (0); 201} 202 203static int 204get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags) 205{ 206 mcontext_t mcp64; 207 unsigned i; 208 int error; 209 210 error = get_mcontext(td, &mcp64, flags); 211 if (error != 0) 212 return (error); 213 214 mcp->mc_onstack = mcp64.mc_onstack; 215 mcp->mc_pc = mcp64.mc_pc; 216 for (i = 0; i < 32; i++) 217 mcp->mc_regs[i] = mcp64.mc_regs[i]; 218 mcp->sr = mcp64.sr; 219 mcp->mullo = mcp64.mullo; 220 mcp->mulhi = mcp64.mulhi; 221 mcp->mc_fpused = mcp64.mc_fpused; 222 for (i = 0; i < 33; i++) 223 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i]; 224 mcp->mc_fpc_eir = mcp64.mc_fpc_eir; 225 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls; 226 227 return (0); 228} 229 230static int 231set_mcontext32(struct thread *td, mcontext32_t *mcp) 232{ 233 mcontext_t mcp64; 234 unsigned i; 235 236 mcp64.mc_onstack = mcp->mc_onstack; 237 mcp64.mc_pc = mcp->mc_pc; 238 for (i = 0; i < 32; i++) 239 mcp64.mc_regs[i] = mcp->mc_regs[i]; 240 mcp64.sr = mcp->sr; 241 mcp64.mullo = mcp->mullo; 242 mcp64.mulhi = mcp->mulhi; 243 mcp64.mc_fpused = mcp->mc_fpused; 244 for (i = 0; i < 33; i++) 245 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i]; 246 mcp64.mc_fpc_eir = mcp->mc_fpc_eir; 247 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls; 248 249 return (set_mcontext(td, &mcp64)); 250} 251 252int 253freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 254{ 255 ucontext32_t uc; 256 int error; 257 258 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 259 260 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 261 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 262 return (EFAULT); 263 } 264 265 error = set_mcontext32(td, &uc.uc_mcontext); 266 if (error != 0) 267 return (error); 268 269 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 270 271#if 0 272 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 273 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 274#endif 275 276 return (EJUSTRETURN); 277} 278 279/* 280 * The first two fields of a ucontext_t are the signal mask and the machine 281 * context. The next field is uc_link; we want to avoid destroying the link 282 * when copying out contexts. 283 */ 284#define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link) 285 286int 287freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 288{ 289 ucontext32_t uc; 290 int ret; 291 292 if (uap->ucp == NULL) 293 ret = EINVAL; 294 else { 295 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 296 PROC_LOCK(td->td_proc); 297 uc.uc_sigmask = td->td_sigmask; 298 PROC_UNLOCK(td->td_proc); 299 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE); 300 } 301 return (ret); 302} 303 304int 305freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 306{ 307 ucontext32_t uc; 308 int ret; 309 310 if (uap->ucp == NULL) 311 ret = EINVAL; 312 else { 313 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 314 if (ret == 0) { 315 ret = set_mcontext32(td, &uc.uc_mcontext); 316 if (ret == 0) { 317 kern_sigprocmask(td, SIG_SETMASK, 318 &uc.uc_sigmask, NULL, 0); 319 } 320 } 321 } 322 return (ret == 0 ? EJUSTRETURN : ret); 323} 324 325int 326freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 327{ 328 ucontext32_t uc; 329 int ret; 330 331 if (uap->oucp == NULL || uap->ucp == NULL) 332 ret = EINVAL; 333 else { 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 */ 365static void 366freebsd32_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 *)((vm_offset_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 /* Translate the signal if appropriate */ 423 if (p->p_sysent->sv_sigtbl) { 424 if (sig <= p->p_sysent->sv_sigsize) 425 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 426 } 427 428 /* Build the argument list for the signal handler. */ 429 td->td_frame->a0 = sig; 430 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc; 431 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 432 /* Signal handler installed with SA_SIGINFO. */ 433 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si; 434 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */ 435 436 /* fill siginfo structure */ 437 sf.sf_si.si_signo = sig; 438 sf.sf_si.si_code = ksi->ksi_code; 439 sf.sf_si.si_addr = td->td_frame->badvaddr; 440 } else { 441 /* Old FreeBSD-style arguments. */ 442 td->td_frame->a1 = ksi->ksi_code; 443 td->td_frame->a3 = td->td_frame->badvaddr; 444 /* sf.sf_ahu.sf_handler = catcher; */ 445 } 446 447 mtx_unlock(&psp->ps_mtx); 448 PROC_UNLOCK(p); 449 450 /* 451 * Copy the sigframe out to the user's stack. 452 */ 453 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) { 454 /* 455 * Something is wrong with the stack pointer. 456 * ...Kill the process. 457 */ 458 PROC_LOCK(p); 459 sigexit(td, SIGILL); 460 } 461 462 td->td_frame->pc = (register_t)(intptr_t)catcher; 463 td->td_frame->t9 = (register_t)(intptr_t)catcher; 464 td->td_frame->sp = (register_t)(intptr_t)sfp; 465 /* 466 * Signal trampoline code is at base of user stack. 467 */ 468 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 469 PROC_LOCK(p); 470 mtx_lock(&psp->ps_mtx); 471} 472 473int 474freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 475{ 476 int error; 477 int32_t tlsbase; 478 479 switch (uap->op) { 480 case MIPS_SET_TLS: 481 td->td_md.md_tls = (void *)(intptr_t)uap->parms; 482 return (0); 483 case MIPS_GET_TLS: 484 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls; 485 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase)); 486 return (error); 487 default: 488 break; 489 } 490 return (EINVAL); 491} 492 493void 494elf32_dump_thread(struct thread *td __unused, void *dst __unused, 495 size_t *off __unused) 496{ 497} 498