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 <machine/armreg.h> 38 #ifdef VFP 39 #include <machine/vfp.h> 40 #endif 41 #include <compat/freebsd32/freebsd32_proto.h> 42 #include <compat/freebsd32/freebsd32_signal.h> 43 44 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 45 46 /* 47 * The first two fields of a ucontext_t are the signal mask and the machine 48 * context. The next field is uc_link; we want to avoid destroying the link 49 * when copying out contexts. 50 */ 51 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link) 52 53 #ifdef VFP 54 static void get_fpcontext32(struct thread *td, mcontext32_vfp_t *); 55 #endif 56 57 /* 58 * Stubs for machine dependent 32-bits system calls. 59 */ 60 61 int 62 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 63 { 64 int error; 65 66 #define ARM_SYNC_ICACHE 0 67 #define ARM_DRAIN_WRITEBUF 1 68 #define ARM_SET_TP 2 69 #define ARM_GET_TP 3 70 #define ARM_GET_VFPSTATE 4 71 72 switch(uap->op) { 73 case ARM_SET_TP: 74 WRITE_SPECIALREG(TPIDR_EL0, uap->parms); 75 WRITE_SPECIALREG(TPIDRRO_EL0, uap->parms); 76 return 0; 77 case ARM_SYNC_ICACHE: 78 { 79 struct { 80 uint32_t addr; 81 uint32_t size; 82 } args; 83 84 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0) 85 return (error); 86 if ((uint64_t)args.addr + (uint64_t)args.size > 0xffffffff) 87 return (EINVAL); 88 cpu_icache_sync_range_checked(args.addr, args.size); 89 return 0; 90 } 91 case ARM_GET_VFPSTATE: 92 { 93 mcontext32_vfp_t mcontext_vfp; 94 95 struct { 96 uint32_t mc_vfp_size; 97 uint32_t mc_vfp; 98 } args; 99 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0) 100 return (error); 101 if (args.mc_vfp_size != sizeof(mcontext_vfp)) 102 return (EINVAL); 103 #ifdef VFP 104 get_fpcontext32(td, &mcontext_vfp); 105 #else 106 bzero(&mcontext_vfp, sizeof(mcontext_vfp)); 107 #endif 108 error = copyout(&mcontext_vfp, 109 (void *)(uintptr_t)args.mc_vfp, 110 sizeof(mcontext_vfp)); 111 return error; 112 } 113 } 114 115 return (EINVAL); 116 } 117 118 119 120 #ifdef VFP 121 static void 122 get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp) 123 { 124 struct pcb *curpcb; 125 126 critical_enter(); 127 curpcb = curthread->td_pcb; 128 129 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) { 130 /* 131 * If we have just been running VFP instructions we will 132 * need to save the state to memcpy it below. 133 */ 134 vfp_save_state(td, curpcb); 135 136 KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate, 137 ("Called get_fpcontext while the kernel is using the VFP")); 138 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0, 139 ("Non-userspace FPU flags set in get_fpcontext")); 140 memcpy(mcp->mcv_reg, curpcb->pcb_fpustate.vfp_regs, 141 sizeof(mcp->mcv_reg)); 142 mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(curpcb->pcb_fpustate.vfp_fpcr, 143 curpcb->pcb_fpustate.vfp_fpsr); 144 } 145 critical_exit(); 146 } 147 148 static void 149 set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp) 150 { 151 struct pcb *pcb; 152 153 critical_enter(); 154 pcb = td->td_pcb; 155 if (td == curthread) 156 vfp_discard(td); 157 memcpy(pcb->pcb_fpustate.vfp_regs, mcp->mcv_reg, 158 sizeof(pcb->pcb_fpustate.vfp_regs)); 159 pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr); 160 pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr); 161 critical_exit(); 162 } 163 #endif 164 static void 165 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags) 166 { 167 struct pcb *pcb; 168 struct trapframe *tf; 169 int i; 170 171 pcb = td->td_pcb; 172 tf = td->td_frame; 173 174 if ((flags & GET_MC_CLEAR_RET) != 0) { 175 mcp->mc_gregset[0] = 0; 176 mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C; 177 } else { 178 mcp->mc_gregset[0] = tf->tf_x[0]; 179 mcp->mc_gregset[16] = tf->tf_spsr; 180 } 181 for (i = 1; i < 15; i++) 182 mcp->mc_gregset[i] = tf->tf_x[i]; 183 mcp->mc_gregset[15] = tf->tf_elr; 184 185 mcp->mc_vfp_size = 0; 186 mcp->mc_vfp_ptr = 0; 187 188 memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare)); 189 } 190 191 static int 192 set_mcontext32(struct thread *td, mcontext32_t *mcp) 193 { 194 struct trapframe *tf; 195 mcontext32_vfp_t mc_vfp; 196 int i; 197 198 tf = td->td_frame; 199 200 for (i = 0; i < 15; i++) 201 tf->tf_x[i] = mcp->mc_gregset[i]; 202 tf->tf_elr = mcp->mc_gregset[15]; 203 tf->tf_spsr = mcp->mc_gregset[16]; 204 #ifdef VFP 205 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) { 206 if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp, 207 sizeof(mc_vfp)) != 0) 208 return (EFAULT); 209 set_fpcontext32(td, &mc_vfp); 210 } 211 #endif 212 213 return (0); 214 } 215 216 #define UC_COPY_SIZE offsetof(ucontext32_t, uc_link) 217 218 int 219 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 220 { 221 ucontext32_t uc; 222 int ret; 223 224 if (uap->ucp == NULL) 225 ret = EINVAL; 226 else { 227 memset(&uc, 0, sizeof(uc)); 228 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 229 PROC_LOCK(td->td_proc); 230 uc.uc_sigmask = td->td_sigmask; 231 PROC_UNLOCK(td->td_proc); 232 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE); 233 } 234 return (ret); 235 } 236 237 int 238 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 239 { 240 ucontext32_t uc; 241 int ret; 242 243 if (uap->ucp == NULL) 244 ret = EINVAL; 245 else { 246 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 247 if (ret == 0) { 248 ret = set_mcontext32(td, &uc.uc_mcontext); 249 if (ret == 0) 250 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, 251 NULL, 0); 252 } 253 } 254 return (ret); 255 } 256 257 int 258 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 259 { 260 ucontext32_t uc; 261 int error; 262 263 if (uap == NULL) 264 return (EFAULT); 265 if (copyin(uap->sigcntxp, &uc, sizeof(uc))) 266 return (EFAULT); 267 error = set_mcontext32(td, &uc.uc_mcontext); 268 if (error != 0) 269 return (0); 270 271 /* Restore signal mask. */ 272 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 273 274 return (EJUSTRETURN); 275 276 } 277 278 int 279 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 280 { 281 ucontext32_t uc; 282 int ret; 283 284 if (uap->oucp == NULL || uap->ucp == NULL) 285 ret = EINVAL; 286 else { 287 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 288 PROC_LOCK(td->td_proc); 289 uc.uc_sigmask = td->td_sigmask; 290 PROC_UNLOCK(td->td_proc); 291 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE); 292 if (ret == 0) { 293 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 294 if (ret == 0) { 295 ret = set_mcontext32(td, &uc.uc_mcontext); 296 kern_sigprocmask(td, SIG_SETMASK, 297 &uc.uc_sigmask, NULL, 0); 298 } 299 } 300 } 301 return (ret); 302 } 303 304 void 305 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 306 { 307 struct thread *td; 308 struct proc *p; 309 struct trapframe *tf; 310 struct sigframe32 *fp, frame; 311 struct sigacts *psp; 312 struct siginfo32 siginfo; 313 struct sysentvec *sysent; 314 int onstack; 315 int sig; 316 int code; 317 318 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 319 td = curthread; 320 p = td->td_proc; 321 PROC_LOCK_ASSERT(p, MA_OWNED); 322 sig = ksi->ksi_signo; 323 code = ksi->ksi_code; 324 psp = p->p_sigacts; 325 mtx_assert(&psp->ps_mtx, MA_OWNED); 326 tf = td->td_frame; 327 onstack = sigonstack(tf->tf_x[13]); 328 329 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 330 catcher, sig); 331 332 /* Allocate and validate space for the signal handler context. */ 333 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) && 334 SIGISMEMBER(psp->ps_sigonstack, sig)) { 335 fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp + 336 td->td_sigstk.ss_size); 337 #if defined(COMPAT_43) 338 td->td_sigstk.ss_flags |= SS_ONSTACK; 339 #endif 340 } else 341 fp = (struct sigframe32 *)td->td_frame->tf_x[13]; 342 343 /* make room on the stack */ 344 fp--; 345 346 /* make the stack aligned */ 347 fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1)); 348 /* Populate the siginfo frame. */ 349 get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0); 350 #ifdef VFP 351 get_fpcontext32(td, &frame.sf_vfp); 352 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp); 353 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp; 354 #else 355 frame.sf_uc.uc_mcontext.mc_vfp_size = 0; 356 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL; 357 #endif 358 frame.sf_si = siginfo; 359 frame.sf_uc.uc_sigmask = *mask; 360 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK ) 361 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE; 362 frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 363 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 364 365 mtx_unlock(&psp->ps_mtx); 366 PROC_UNLOCK(td->td_proc); 367 368 /* Copy the sigframe out to the user's stack. */ 369 if (copyout(&frame, fp, sizeof(*fp)) != 0) { 370 /* Process has trashed its stack. Kill it. */ 371 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp); 372 PROC_LOCK(p); 373 sigexit(td, SIGILL); 374 } 375 376 /* 377 * Build context to run handler in. We invoke the handler 378 * directly, only returning via the trampoline. Note the 379 * trampoline version numbers are coordinated with machine- 380 * dependent code in libc. 381 */ 382 383 tf->tf_x[0] = sig; 384 tf->tf_x[1] = (register_t)&fp->sf_si; 385 tf->tf_x[2] = (register_t)&fp->sf_uc; 386 387 /* the trampoline uses r5 as the uc address */ 388 tf->tf_x[5] = (register_t)&fp->sf_uc; 389 tf->tf_elr = (register_t)catcher; 390 tf->tf_x[13] = (register_t)fp; 391 sysent = p->p_sysent; 392 if (sysent->sv_sigcode_base != 0) 393 tf->tf_x[14] = (register_t)sysent->sv_sigcode_base; 394 else 395 tf->tf_x[14] = (register_t)(sysent->sv_psstrings - 396 *(sysent->sv_szsigcode)); 397 /* Set the mode to enter in the signal handler */ 398 if ((register_t)catcher & 1) 399 tf->tf_spsr |= PSR_T; 400 else 401 tf->tf_spsr &= ~PSR_T; 402 403 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14], 404 tf->tf_x[13]); 405 406 PROC_LOCK(p); 407 mtx_lock(&psp->ps_mtx); 408 409 } 410