freebsd32_machdep.c revision 293613
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 293613 2016-01-09 20:18:53Z 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_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}; 109INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 110 111static 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 122SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 123 (sysinit_cfunc_t) elf32_insert_brand_entry, 124 &freebsd_brand_info); 125 126static void 127freebsd32_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 143int 144set_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 155int 156fill_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 172int 173set_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 184int 185fill_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 201static int 202get_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 228static int 229set_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 250int 251freebsd32_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 284int 285freebsd32_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 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 294 PROC_LOCK(td->td_proc); 295 uc.uc_sigmask = td->td_sigmask; 296 PROC_UNLOCK(td->td_proc); 297 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE); 298 } 299 return (ret); 300} 301 302int 303freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 304{ 305 ucontext32_t uc; 306 int ret; 307 308 if (uap->ucp == NULL) 309 ret = EINVAL; 310 else { 311 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 312 if (ret == 0) { 313 ret = set_mcontext32(td, &uc.uc_mcontext); 314 if (ret == 0) { 315 kern_sigprocmask(td, SIG_SETMASK, 316 &uc.uc_sigmask, NULL, 0); 317 } 318 } 319 } 320 return (ret == 0 ? EJUSTRETURN : ret); 321} 322 323int 324freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 325{ 326 ucontext32_t uc; 327 int ret; 328 329 if (uap->oucp == NULL || uap->ucp == NULL) 330 ret = EINVAL; 331 else { 332 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 333 PROC_LOCK(td->td_proc); 334 uc.uc_sigmask = td->td_sigmask; 335 PROC_UNLOCK(td->td_proc); 336 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE); 337 if (ret == 0) { 338 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 339 if (ret == 0) { 340 ret = set_mcontext32(td, &uc.uc_mcontext); 341 if (ret == 0) { 342 kern_sigprocmask(td, SIG_SETMASK, 343 &uc.uc_sigmask, NULL, 0); 344 } 345 } 346 } 347 } 348 return (ret == 0 ? EJUSTRETURN : ret); 349} 350 351#define UCONTEXT_MAGIC 0xACEDBADE 352 353/* 354 * Send an interrupt to process. 355 * 356 * Stack is set up to allow sigcode stored 357 * at top to call routine, followed by kcall 358 * to sigreturn routine below. After sigreturn 359 * resets the signal mask, the stack, and the 360 * frame pointer, it returns to the user 361 * specified pc, psl. 362 */ 363static void 364freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 365{ 366 struct proc *p; 367 struct thread *td; 368 struct fpreg32 fpregs; 369 struct reg32 regs; 370 struct sigacts *psp; 371 struct sigframe32 sf, *sfp; 372 int sig; 373 int oonstack; 374 unsigned i; 375 376 td = curthread; 377 p = td->td_proc; 378 PROC_LOCK_ASSERT(p, MA_OWNED); 379 sig = ksi->ksi_signo; 380 psp = p->p_sigacts; 381 mtx_assert(&psp->ps_mtx, MA_OWNED); 382 383 fill_regs32(td, ®s); 384 oonstack = sigonstack(td->td_frame->sp); 385 386 /* save user context */ 387 bzero(&sf, sizeof sf); 388 sf.sf_uc.uc_sigmask = *mask; 389 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp; 390 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 391 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags; 392 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 393 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC]; 394 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO]; 395 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI]; 396 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls; 397 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */ 398 for (i = 1; i < 32; i++) 399 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i]; 400 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED; 401 if (sf.sf_uc.uc_mcontext.mc_fpused) { 402 /* if FPU has current state, save it first */ 403 if (td == PCPU_GET(fpcurthread)) 404 MipsSaveCurFPState(td); 405 fill_fpregs32(td, &fpregs); 406 for (i = 0; i < 33; i++) 407 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i]; 408 } 409 410 /* Allocate and validate space for the signal handler context. */ 411 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 412 SIGISMEMBER(psp->ps_sigonstack, sig)) { 413 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_sigstk.ss_sp + 414 td->td_sigstk.ss_size - sizeof(struct sigframe32)) 415 & ~(sizeof(__int64_t) - 1)); 416 } else 417 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp - 418 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1)); 419 420 /* Build the argument list for the signal handler. */ 421 td->td_frame->a0 = sig; 422 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc; 423 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 424 /* Signal handler installed with SA_SIGINFO. */ 425 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si; 426 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */ 427 428 /* fill siginfo structure */ 429 sf.sf_si.si_signo = sig; 430 sf.sf_si.si_code = ksi->ksi_code; 431 sf.sf_si.si_addr = td->td_frame->badvaddr; 432 } else { 433 /* Old FreeBSD-style arguments. */ 434 td->td_frame->a1 = ksi->ksi_code; 435 td->td_frame->a3 = td->td_frame->badvaddr; 436 /* sf.sf_ahu.sf_handler = catcher; */ 437 } 438 439 mtx_unlock(&psp->ps_mtx); 440 PROC_UNLOCK(p); 441 442 /* 443 * Copy the sigframe out to the user's stack. 444 */ 445 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) { 446 /* 447 * Something is wrong with the stack pointer. 448 * ...Kill the process. 449 */ 450 PROC_LOCK(p); 451 sigexit(td, SIGILL); 452 } 453 454 td->td_frame->pc = (register_t)(intptr_t)catcher; 455 td->td_frame->t9 = (register_t)(intptr_t)catcher; 456 td->td_frame->sp = (register_t)(intptr_t)sfp; 457 /* 458 * Signal trampoline code is at base of user stack. 459 */ 460 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 461 PROC_LOCK(p); 462 mtx_lock(&psp->ps_mtx); 463} 464 465int 466freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 467{ 468 int error; 469 int32_t tlsbase; 470 471 switch (uap->op) { 472 case MIPS_SET_TLS: 473 td->td_md.md_tls = (void *)(intptr_t)uap->parms; 474 return (0); 475 case MIPS_GET_TLS: 476 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls; 477 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase)); 478 return (error); 479 default: 480 break; 481 } 482 return (EINVAL); 483} 484 485void 486elf32_dump_thread(struct thread *td __unused, void *dst __unused, 487 size_t *off __unused) 488{ 489} 490