1 /*- 2 * Copyright (c) 2018 Olivier Houchard 3 * Copyright (c) 2017 Nuxi, https://nuxi.nl/ 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/proc.h> 32 #include <sys/lock.h> 33 #include <sys/mutex.h> 34 #include <sys/syscallsubr.h> 35 #include <sys/ktr.h> 36 #include <sys/sysent.h> 37 #include <sys/sysproto.h> 38 #include <machine/armreg.h> 39 #ifdef VFP 40 #include <machine/vfp.h> 41 #endif 42 #include <compat/freebsd32/freebsd32_proto.h> 43 #include <compat/freebsd32/freebsd32_signal.h> 44 45 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 46 47 /* 48 * The first two fields of a ucontext_t are the signal mask and the machine 49 * context. The next field is uc_link; we want to avoid destroying the link 50 * when copying out contexts. 51 */ 52 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link) 53 54 #ifdef VFP 55 static void get_fpcontext32(struct thread *td, mcontext32_vfp_t *); 56 #endif 57 58 /* 59 * Stubs for machine dependent 32-bits system calls. 60 */ 61 62 int 63 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 64 { 65 int error; 66 67 #define ARM_SYNC_ICACHE 0 68 #define ARM_DRAIN_WRITEBUF 1 69 #define ARM_SET_TP 2 70 #define ARM_GET_TP 3 71 #define ARM_GET_VFPSTATE 4 72 73 switch(uap->op) { 74 case ARM_SET_TP: 75 WRITE_SPECIALREG(tpidr_el0, uap->parms); 76 WRITE_SPECIALREG(tpidrro_el0, uap->parms); 77 return 0; 78 case ARM_SYNC_ICACHE: 79 { 80 struct { 81 uint32_t addr; 82 uint32_t size; 83 } args; 84 85 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0) 86 return (error); 87 if ((uint64_t)args.addr + (uint64_t)args.size > 0xffffffff) 88 return (EINVAL); 89 cpu_icache_sync_range_checked(args.addr, args.size); 90 return 0; 91 } 92 case ARM_GET_VFPSTATE: 93 { 94 mcontext32_vfp_t mcontext_vfp; 95 96 struct { 97 uint32_t mc_vfp_size; 98 uint32_t mc_vfp; 99 } args; 100 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0) 101 return (error); 102 if (args.mc_vfp_size != sizeof(mcontext_vfp)) 103 return (EINVAL); 104 #ifdef VFP 105 get_fpcontext32(td, &mcontext_vfp); 106 #else 107 bzero(&mcontext_vfp, sizeof(mcontext_vfp)); 108 #endif 109 error = copyout(&mcontext_vfp, 110 (void *)(uintptr_t)args.mc_vfp, 111 sizeof(mcontext_vfp)); 112 return error; 113 } 114 } 115 116 return (EINVAL); 117 } 118 119 120 121 #ifdef VFP 122 static void 123 get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp) 124 { 125 struct pcb *curpcb; 126 int i; 127 128 critical_enter(); 129 curpcb = curthread->td_pcb; 130 131 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) { 132 /* 133 * If we have just been running VFP instructions we will 134 * need to save the state to memcpy it below. 135 */ 136 vfp_save_state(td, curpcb); 137 138 KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate, 139 ("Called get_fpcontext while the kernel is using the VFP")); 140 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0, 141 ("Non-userspace FPU flags set in get_fpcontext")); 142 for (i = 0; i < 32; i++) 143 mcp->mcv_reg[i] = (uint64_t)curpcb->pcb_fpustate.vfp_regs[i]; 144 mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(curpcb->pcb_fpustate.vfp_fpcr, 145 curpcb->pcb_fpustate.vfp_fpsr); 146 } 147 critical_exit(); 148 } 149 150 static void 151 set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp) 152 { 153 struct pcb *pcb; 154 int i; 155 156 critical_enter(); 157 pcb = td->td_pcb; 158 if (td == curthread) 159 vfp_discard(td); 160 for (i = 0; i < 32; i++) 161 pcb->pcb_fpustate.vfp_regs[i] = mcp->mcv_reg[i]; 162 pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr); 163 pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr); 164 critical_exit(); 165 } 166 #endif 167 static void 168 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags) 169 { 170 struct pcb *pcb; 171 struct trapframe *tf; 172 int i; 173 174 pcb = td->td_pcb; 175 tf = td->td_frame; 176 177 if ((flags & GET_MC_CLEAR_RET) != 0) { 178 mcp->mc_gregset[0] = 0; 179 mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C; 180 } else { 181 mcp->mc_gregset[0] = tf->tf_x[0]; 182 mcp->mc_gregset[16] = tf->tf_spsr; 183 } 184 for (i = 1; i < 15; i++) 185 mcp->mc_gregset[i] = tf->tf_x[i]; 186 mcp->mc_gregset[15] = tf->tf_elr; 187 188 mcp->mc_vfp_size = 0; 189 mcp->mc_vfp_ptr = 0; 190 191 memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare)); 192 } 193 194 static int 195 set_mcontext32(struct thread *td, mcontext32_t *mcp) 196 { 197 struct trapframe *tf; 198 mcontext32_vfp_t mc_vfp; 199 int i; 200 201 tf = td->td_frame; 202 203 for (i = 0; i < 15; i++) 204 tf->tf_x[i] = mcp->mc_gregset[i]; 205 tf->tf_elr = mcp->mc_gregset[15]; 206 tf->tf_spsr = mcp->mc_gregset[16]; 207 #ifdef VFP 208 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) { 209 if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp, 210 sizeof(mc_vfp)) != 0) 211 return (EFAULT); 212 set_fpcontext32(td, &mc_vfp); 213 } 214 #endif 215 216 return (0); 217 } 218 219 #define UC_COPY_SIZE offsetof(ucontext32_t, uc_link) 220 221 int 222 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 223 { 224 ucontext32_t uc; 225 int ret; 226 227 if (uap->ucp == NULL) 228 ret = EINVAL; 229 else { 230 memset(&uc, 0, sizeof(uc)); 231 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 232 PROC_LOCK(td->td_proc); 233 uc.uc_sigmask = td->td_sigmask; 234 PROC_UNLOCK(td->td_proc); 235 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE); 236 } 237 return (ret); 238 } 239 240 int 241 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 242 { 243 ucontext32_t uc; 244 int ret; 245 246 if (uap->ucp == NULL) 247 ret = EINVAL; 248 else { 249 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 250 if (ret == 0) { 251 ret = set_mcontext32(td, &uc.uc_mcontext); 252 if (ret == 0) 253 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, 254 NULL, 0); 255 } 256 } 257 return (ret); 258 } 259 260 int 261 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 262 { 263 ucontext32_t uc; 264 int error; 265 266 if (uap == NULL) 267 return (EFAULT); 268 if (copyin(uap->sigcntxp, &uc, sizeof(uc))) 269 return (EFAULT); 270 error = set_mcontext32(td, &uc.uc_mcontext); 271 if (error != 0) 272 return (0); 273 274 /* Restore signal mask. */ 275 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 276 277 return (EJUSTRETURN); 278 279 } 280 281 int 282 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 283 { 284 ucontext32_t uc; 285 int ret; 286 287 if (uap->oucp == NULL || uap->ucp == NULL) 288 ret = EINVAL; 289 else { 290 bzero(&uc, sizeof(uc)); 291 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 292 PROC_LOCK(td->td_proc); 293 uc.uc_sigmask = td->td_sigmask; 294 PROC_UNLOCK(td->td_proc); 295 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE); 296 if (ret == 0) { 297 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 298 if (ret == 0) { 299 ret = set_mcontext32(td, &uc.uc_mcontext); 300 kern_sigprocmask(td, SIG_SETMASK, 301 &uc.uc_sigmask, NULL, 0); 302 } 303 } 304 } 305 return (ret); 306 } 307 308 void 309 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 310 { 311 struct thread *td; 312 struct proc *p; 313 struct trapframe *tf; 314 struct sigframe32 *fp, frame; 315 struct sigacts *psp; 316 struct siginfo32 siginfo; 317 struct sysentvec *sysent; 318 int onstack; 319 int sig; 320 int code; 321 322 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 323 td = curthread; 324 p = td->td_proc; 325 PROC_LOCK_ASSERT(p, MA_OWNED); 326 sig = ksi->ksi_signo; 327 code = ksi->ksi_code; 328 psp = p->p_sigacts; 329 mtx_assert(&psp->ps_mtx, MA_OWNED); 330 tf = td->td_frame; 331 onstack = sigonstack(tf->tf_x[13]); 332 333 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 334 catcher, sig); 335 336 /* Allocate and validate space for the signal handler context. */ 337 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) && 338 SIGISMEMBER(psp->ps_sigonstack, sig)) { 339 fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp + 340 td->td_sigstk.ss_size); 341 #if defined(COMPAT_43) 342 td->td_sigstk.ss_flags |= SS_ONSTACK; 343 #endif 344 } else 345 fp = (struct sigframe32 *)td->td_frame->tf_x[13]; 346 347 /* make room on the stack */ 348 fp--; 349 350 /* make the stack aligned */ 351 fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1)); 352 /* Populate the siginfo frame. */ 353 get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0); 354 #ifdef VFP 355 get_fpcontext32(td, &frame.sf_vfp); 356 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp); 357 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp; 358 #else 359 frame.sf_uc.uc_mcontext.mc_vfp_size = 0; 360 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL; 361 #endif 362 frame.sf_si = siginfo; 363 frame.sf_uc.uc_sigmask = *mask; 364 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK ) 365 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE; 366 frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 367 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 368 369 mtx_unlock(&psp->ps_mtx); 370 PROC_UNLOCK(td->td_proc); 371 372 /* Copy the sigframe out to the user's stack. */ 373 if (copyout(&frame, fp, sizeof(*fp)) != 0) { 374 /* Process has trashed its stack. Kill it. */ 375 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp); 376 PROC_LOCK(p); 377 sigexit(td, SIGILL); 378 } 379 380 /* 381 * Build context to run handler in. We invoke the handler 382 * directly, only returning via the trampoline. Note the 383 * trampoline version numbers are coordinated with machine- 384 * dependent code in libc. 385 */ 386 387 tf->tf_x[0] = sig; 388 tf->tf_x[1] = (register_t)&fp->sf_si; 389 tf->tf_x[2] = (register_t)&fp->sf_uc; 390 391 /* the trampoline uses r5 as the uc address */ 392 tf->tf_x[5] = (register_t)&fp->sf_uc; 393 tf->tf_elr = (register_t)catcher; 394 tf->tf_x[13] = (register_t)fp; 395 sysent = p->p_sysent; 396 if (sysent->sv_sigcode_base != 0) 397 tf->tf_x[14] = (register_t)sysent->sv_sigcode_base; 398 else 399 tf->tf_x[14] = (register_t)(sysent->sv_psstrings - 400 *(sysent->sv_szsigcode)); 401 /* Set the mode to enter in the signal handler */ 402 if ((register_t)catcher & 1) 403 tf->tf_spsr |= PSR_T; 404 else 405 tf->tf_spsr &= ~PSR_T; 406 407 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14], 408 tf->tf_x[13]); 409 410 PROC_LOCK(p); 411 mtx_lock(&psp->ps_mtx); 412 413 } 414 415 #ifdef COMPAT_43 416 /* 417 * COMPAT_FREEBSD32 assumes we have this system call when COMPAT_43 is defined. 418 * FreeBSD/arm provies a similar getpagesize() syscall. 419 */ 420 #define ARM32_PAGE_SIZE 4096 421 int 422 ofreebsd32_getpagesize(struct thread *td, 423 struct ofreebsd32_getpagesize_args *uap) 424 { 425 426 td->td_retval[0] = ARM32_PAGE_SIZE; 427 return (0); 428 } 429 430 /* 431 * Mirror the osigreturn definition in kern_sig.c for !i386 platforms. This 432 * mirrors what's connected to the FreeBSD/arm syscall. 433 */ 434 int 435 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap) 436 { 437 438 return (nosys(td, (struct nosys_args *)uap)); 439 } 440 #endif 441