Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/exec_machdep.c
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1 /*- 2 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 3 * Copyright (C) 1995, 1996 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (C) 2001 Benno Rice 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 44 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 49 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 50 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 51 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 52 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 53 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $ 55 */ 56 57 #include <sys/cdefs.h> 58 __FBSDID("$FreeBSD: releng/8.3/sys/powerpc/powerpc/exec_machdep.c 211595 2010-08-22 00:04:24Z nwhitehorn $"); 59 60 #include "opt_compat.h" 61 62 #include <sys/param.h> 63 #include <sys/proc.h> 64 #include <sys/systm.h> 65 #include <sys/bio.h> 66 #include <sys/buf.h> 67 #include <sys/bus.h> 68 #include <sys/cons.h> 69 #include <sys/cpu.h> 70 #include <sys/exec.h> 71 #include <sys/imgact.h> 72 #include <sys/kernel.h> 73 #include <sys/ktr.h> 74 #include <sys/lock.h> 75 #include <sys/malloc.h> 76 #include <sys/mutex.h> 77 #include <sys/signalvar.h> 78 #include <sys/syscallsubr.h> 79 #include <sys/syscall.h> 80 #include <sys/sysent.h> 81 #include <sys/sysproto.h> 82 #include <sys/ucontext.h> 83 #include <sys/uio.h> 84 85 #include <machine/altivec.h> 86 #include <machine/cpu.h> 87 #include <machine/elf.h> 88 #include <machine/fpu.h> 89 #include <machine/pcb.h> 90 #include <machine/reg.h> 91 #include <machine/sigframe.h> 92 #include <machine/trap.h> 93 #include <machine/vmparam.h> 94 95 static int grab_mcontext(struct thread *, mcontext_t *, int); 96 97 void 98 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 99 { 100 struct trapframe *tf; 101 struct sigacts *psp; 102 struct sigframe sf; 103 struct thread *td; 104 struct proc *p; 105 size_t sfpsize; 106 caddr_t sfp, usfp; 107 int oonstack, rndfsize; 108 int sig; 109 int code; 110 111 td = curthread; 112 p = td->td_proc; 113 PROC_LOCK_ASSERT(p, MA_OWNED); 114 115 psp = p->p_sigacts; 116 mtx_assert(&psp->ps_mtx, MA_OWNED); 117 tf = td->td_frame; 118 oonstack = sigonstack(tf->fixreg[1]); 119 120 /* 121 * Fill siginfo structure. 122 */ 123 ksi->ksi_info.si_signo = ksi->ksi_signo; 124 #ifdef AIM 125 ksi->ksi_info.si_addr = (void *)((tf->exc == EXC_DSI) ? 126 tf->cpu.aim.dar : tf->srr0); 127 #else 128 ksi->ksi_info.si_addr = (void *)((tf->exc == EXC_DSI) ? 129 tf->cpu.booke.dear : tf->srr0); 130 #endif 131 132 sig = ksi->ksi_signo; 133 code = ksi->ksi_code; 134 sfp = (caddr_t)&sf; 135 sfpsize = sizeof(sf); 136 rndfsize = ((sizeof(sf) + 15) / 16) * 16; 137 138 /* 139 * Save user context 140 */ 141 142 memset(&sf, 0, sizeof(sf)); 143 grab_mcontext(td, &sf.sf_uc.uc_mcontext, 0); 144 145 sf.sf_uc.uc_sigmask = *mask; 146 sf.sf_uc.uc_stack = td->td_sigstk; 147 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 148 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 149 150 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 151 152 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 153 catcher, sig); 154 155 /* 156 * Allocate and validate space for the signal handler context. 157 */ 158 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 159 SIGISMEMBER(psp->ps_sigonstack, sig)) { 160 usfp = (void *)(td->td_sigstk.ss_sp + 161 td->td_sigstk.ss_size - rndfsize); 162 } else { 163 usfp = (void *)(tf->fixreg[1] - rndfsize); 164 } 165 166 /* 167 * Translate the signal if appropriate (Linux emu ?) 168 */ 169 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 170 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 171 172 /* 173 * Save the floating-point state, if necessary, then copy it. 174 */ 175 /* XXX */ 176 177 /* 178 * Set up the registers to return to sigcode. 179 * 180 * r1/sp - sigframe ptr 181 * lr - sig function, dispatched to by blrl in trampoline 182 * r3 - sig number 183 * r4 - SIGINFO ? &siginfo : exception code 184 * r5 - user context 185 * srr0 - trampoline function addr 186 */ 187 tf->lr = (register_t)catcher; 188 tf->fixreg[1] = (register_t)usfp; 189 tf->fixreg[FIRSTARG] = sig; 190 tf->fixreg[FIRSTARG+2] = (register_t)usfp + 191 offsetof(struct sigframe, sf_uc); 192 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 193 /* 194 * Signal handler installed with SA_SIGINFO. 195 */ 196 tf->fixreg[FIRSTARG+1] = (register_t)usfp + 197 offsetof(struct sigframe, sf_si); 198 sf.sf_si = ksi->ksi_info; 199 } else { 200 /* Old FreeBSD-style arguments. */ 201 tf->fixreg[FIRSTARG+1] = code; 202 #ifdef AIM 203 tf->fixreg[FIRSTARG+3] = (tf->exc == EXC_DSI) ? 204 tf->cpu.aim.dar : tf->srr0; 205 #else 206 tf->fixreg[FIRSTARG+3] = (tf->exc == EXC_DSI) ? 207 tf->cpu.booke.dear : tf->srr0; 208 #endif 209 } 210 mtx_unlock(&psp->ps_mtx); 211 PROC_UNLOCK(p); 212 213 tf->srr0 = (register_t)(p->p_sysent->sv_psstrings - 214 *(p->p_sysent->sv_szsigcode)); 215 216 /* 217 * copy the frame out to userland. 218 */ 219 if (copyout(sfp, usfp, sfpsize) != 0) { 220 /* 221 * Process has trashed its stack. Kill it. 222 */ 223 CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp); 224 PROC_LOCK(p); 225 sigexit(td, SIGILL); 226 } 227 228 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, 229 tf->srr0, tf->fixreg[1]); 230 231 PROC_LOCK(p); 232 mtx_lock(&psp->ps_mtx); 233 } 234 235 int 236 sigreturn(struct thread *td, struct sigreturn_args *uap) 237 { 238 ucontext_t uc; 239 int error; 240 241 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 242 243 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 244 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 245 return (EFAULT); 246 } 247 248 error = set_mcontext(td, &uc.uc_mcontext); 249 if (error != 0) 250 return (error); 251 252 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 253 254 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 255 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 256 257 return (EJUSTRETURN); 258 } 259 260 #ifdef COMPAT_FREEBSD4 261 int 262 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 263 { 264 265 return sigreturn(td, (struct sigreturn_args *)uap); 266 } 267 #endif 268 269 /* 270 * Construct a PCB from a trapframe. This is called from kdb_trap() where 271 * we want to start a backtrace from the function that caused us to enter 272 * the debugger. We have the context in the trapframe, but base the trace 273 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 274 * enough for a backtrace. 275 */ 276 void 277 makectx(struct trapframe *tf, struct pcb *pcb) 278 { 279 280 pcb->pcb_lr = tf->srr0; 281 pcb->pcb_sp = tf->fixreg[1]; 282 } 283 284 /* 285 * get_mcontext/sendsig helper routine that doesn't touch the 286 * proc lock 287 */ 288 static int 289 grab_mcontext(struct thread *td, mcontext_t *mcp, int flags) 290 { 291 struct pcb *pcb; 292 293 pcb = td->td_pcb; 294 295 memset(mcp, 0, sizeof(mcontext_t)); 296 297 mcp->mc_vers = _MC_VERSION; 298 mcp->mc_flags = 0; 299 memcpy(&mcp->mc_frame, td->td_frame, sizeof(struct trapframe)); 300 if (flags & GET_MC_CLEAR_RET) { 301 mcp->mc_gpr[3] = 0; 302 mcp->mc_gpr[4] = 0; 303 } 304 305 #ifdef AIM 306 /* 307 * This assumes that floating-point context is *not* lazy, 308 * so if the thread has used FP there would have been a 309 * FP-unavailable exception that would have set things up 310 * correctly. 311 */ 312 if (pcb->pcb_flags & PCB_FPU) { 313 KASSERT(td == curthread, 314 ("get_mcontext: fp save not curthread")); 315 critical_enter(); 316 save_fpu(td); 317 critical_exit(); 318 mcp->mc_flags |= _MC_FP_VALID; 319 memcpy(&mcp->mc_fpscr, &pcb->pcb_fpu.fpscr, sizeof(double)); 320 memcpy(mcp->mc_fpreg, pcb->pcb_fpu.fpr, 32*sizeof(double)); 321 } 322 323 /* 324 * Repeat for Altivec context 325 */ 326 327 if (pcb->pcb_flags & PCB_VEC) { 328 KASSERT(td == curthread, 329 ("get_mcontext: fp save not curthread")); 330 critical_enter(); 331 save_vec(td); 332 critical_exit(); 333 mcp->mc_flags |= _MC_AV_VALID; 334 mcp->mc_vscr = pcb->pcb_vec.vscr; 335 mcp->mc_vrsave = pcb->pcb_vec.vrsave; 336 memcpy(mcp->mc_avec, pcb->pcb_vec.vr, sizeof(mcp->mc_avec)); 337 } 338 #endif 339 340 mcp->mc_len = sizeof(*mcp); 341 342 return (0); 343 } 344 345 int 346 get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 347 { 348 int error; 349 350 error = grab_mcontext(td, mcp, flags); 351 if (error == 0) { 352 PROC_LOCK(curthread->td_proc); 353 mcp->mc_onstack = sigonstack(td->td_frame->fixreg[1]); 354 PROC_UNLOCK(curthread->td_proc); 355 } 356 357 return (error); 358 } 359 360 int 361 set_mcontext(struct thread *td, const mcontext_t *mcp) 362 { 363 struct pcb *pcb; 364 struct trapframe *tf; 365 366 pcb = td->td_pcb; 367 tf = td->td_frame; 368 369 if (mcp->mc_vers != _MC_VERSION || mcp->mc_len != sizeof(*mcp)) 370 return (EINVAL); 371 372 #ifdef AIM 373 /* 374 * Don't let the user set privileged MSR bits 375 */ 376 if ((mcp->mc_srr1 & PSL_USERSTATIC) != (tf->srr1 & PSL_USERSTATIC)) { 377 return (EINVAL); 378 } 379 #endif 380 381 memcpy(tf, mcp->mc_frame, sizeof(mcp->mc_frame)); 382 383 #ifdef AIM 384 if (mcp->mc_flags & _MC_FP_VALID) { 385 if ((pcb->pcb_flags & PCB_FPU) != PCB_FPU) { 386 critical_enter(); 387 enable_fpu(td); 388 critical_exit(); 389 } 390 memcpy(&pcb->pcb_fpu.fpscr, &mcp->mc_fpscr, sizeof(double)); 391 memcpy(pcb->pcb_fpu.fpr, mcp->mc_fpreg, 32*sizeof(double)); 392 } 393 394 if (mcp->mc_flags & _MC_AV_VALID) { 395 if ((pcb->pcb_flags & PCB_VEC) != PCB_VEC) { 396 critical_enter(); 397 enable_vec(td); 398 critical_exit(); 399 } 400 pcb->pcb_vec.vscr = mcp->mc_vscr; 401 pcb->pcb_vec.vrsave = mcp->mc_vrsave; 402 memcpy(pcb->pcb_vec.vr, mcp->mc_avec, sizeof(mcp->mc_avec)); 403 } 404 #endif 405 406 return (0); 407 } 408 409 /* 410 * Set set up registers on exec. 411 */ 412 void 413 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings) 414 { 415 struct trapframe *tf; 416 register_t argc; 417 418 tf = trapframe(td); 419 bzero(tf, sizeof *tf); 420 tf->fixreg[1] = -roundup(-stack + 8, 16); 421 422 /* 423 * Set up arguments for _start(): 424 * _start(argc, argv, envp, obj, cleanup, ps_strings); 425 * 426 * Notes: 427 * - obj and cleanup are the auxilliary and termination 428 * vectors. They are fixed up by ld.elf_so. 429 * - ps_strings is a NetBSD extention, and will be 430 * ignored by executables which are strictly 431 * compliant with the SVR4 ABI. 432 * 433 * XXX We have to set both regs and retval here due to different 434 * XXX calling convention in trap.c and init_main.c. 435 */ 436 437 /* Collect argc from the user stack */ 438 argc = fuword((void *)stack); 439 440 /* 441 * XXX PG: these get overwritten in the syscall return code. 442 * execve() should return EJUSTRETURN, like it does on NetBSD. 443 * Emulate by setting the syscall return value cells. The 444 * registers still have to be set for init's fork trampoline. 445 */ 446 td->td_retval[0] = argc; 447 td->td_retval[1] = stack + sizeof(register_t); 448 tf->fixreg[3] = argc; 449 tf->fixreg[4] = stack + sizeof(register_t); 450 tf->fixreg[5] = stack + (2 + argc)*sizeof(register_t); 451 tf->fixreg[6] = 0; /* auxillary vector */ 452 tf->fixreg[7] = 0; /* termination vector */ 453 tf->fixreg[8] = (register_t)ps_strings; /* NetBSD extension */ 454 455 tf->srr0 = entry; 456 tf->srr1 = PSL_USERSET | PSL_FE_DFLT; 457 td->td_pcb->pcb_flags = 0; 458 } 459 460 461 int 462 fill_regs(struct thread *td, struct reg *regs) 463 { 464 struct trapframe *tf; 465 466 tf = td->td_frame; 467 memcpy(regs, tf, sizeof(struct reg)); 468 469 return (0); 470 } 471 472 int 473 fill_dbregs(struct thread *td, struct dbreg *dbregs) 474 { 475 /* No debug registers on PowerPC */ 476 return (ENOSYS); 477 } 478 479 int 480 fill_fpregs(struct thread *td, struct fpreg *fpregs) 481 { 482 struct pcb *pcb; 483 484 pcb = td->td_pcb; 485 486 if ((pcb->pcb_flags & PCB_FPU) == 0) 487 memset(fpregs, 0, sizeof(struct fpreg)); 488 else 489 memcpy(fpregs, &pcb->pcb_fpu, sizeof(struct fpreg)); 490 491 return (0); 492 } 493 494 int 495 set_regs(struct thread *td, struct reg *regs) 496 { 497 struct trapframe *tf; 498 499 tf = td->td_frame; 500 memcpy(tf, regs, sizeof(struct reg)); 501 502 return (0); 503 } 504 505 int 506 set_dbregs(struct thread *td, struct dbreg *dbregs) 507 { 508 /* No debug registers on PowerPC */ 509 return (ENOSYS); 510 } 511 512 int 513 set_fpregs(struct thread *td, struct fpreg *fpregs) 514 { 515 #ifdef AIM 516 struct pcb *pcb; 517 518 pcb = td->td_pcb; 519 if ((pcb->pcb_flags & PCB_FPU) == 0) 520 enable_fpu(td); 521 memcpy(&pcb->pcb_fpu, fpregs, sizeof(struct fpreg)); 522 #endif 523 524 return (0); 525 } 526 527 528 529 void 530 cpu_set_syscall_retval(struct thread *td, int error) 531 { 532 struct proc *p; 533 struct trapframe *tf; 534 int fixup; 535 536 if (error == EJUSTRETURN) 537 return; 538 539 p = td->td_proc; 540 tf = td->td_frame; 541 542 if (tf->fixreg[0] == SYS___syscall) { 543 int code = tf->fixreg[FIRSTARG + 1]; 544 if (p->p_sysent->sv_mask) 545 code &= p->p_sysent->sv_mask; 546 fixup = (code != SYS_freebsd6_lseek && code != SYS_lseek) ? 547 1 : 0; 548 } else 549 fixup = 0; 550 551 switch (error) { 552 case 0: 553 if (fixup) { 554 /* 555 * 64-bit return, 32-bit syscall. Fixup byte order 556 */ 557 tf->fixreg[FIRSTARG] = 0; 558 tf->fixreg[FIRSTARG + 1] = td->td_retval[0]; 559 } else { 560 tf->fixreg[FIRSTARG] = td->td_retval[0]; 561 tf->fixreg[FIRSTARG + 1] = td->td_retval[1]; 562 } 563 tf->cr &= ~0x10000000; /* Unset summary overflow */ 564 break; 565 case ERESTART: 566 /* 567 * Set user's pc back to redo the system call. 568 */ 569 tf->srr0 -= 4; 570 break; 571 default: 572 if (p->p_sysent->sv_errsize) { 573 error = (error < p->p_sysent->sv_errsize) ? 574 p->p_sysent->sv_errtbl[error] : -1; 575 } 576 tf->fixreg[FIRSTARG] = error; 577 tf->cr |= 0x10000000; /* Set summary overflow */ 578 break; 579 } 580 } 581 582 /* 583 * Threading functions 584 */ 585 void 586 cpu_thread_exit(struct thread *td) 587 { 588 } 589 590 void 591 cpu_thread_clean(struct thread *td) 592 { 593 } 594 595 void 596 cpu_thread_alloc(struct thread *td) 597 { 598 struct pcb *pcb; 599 600 pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 601 sizeof(struct pcb)) & ~0x2fUL); 602 td->td_pcb = pcb; 603 td->td_frame = (struct trapframe *)pcb - 1; 604 } 605 606 void 607 cpu_thread_free(struct thread *td) 608 { 609 } 610 611 int 612 cpu_set_user_tls(struct thread *td, void *tls_base) 613 { 614 615 td->td_frame->fixreg[2] = (register_t)tls_base + 0x7008; 616 return (0); 617 } 618 619 void 620 cpu_set_upcall(struct thread *td, struct thread *td0) 621 { 622 struct pcb *pcb2; 623 struct trapframe *tf; 624 struct callframe *cf; 625 626 pcb2 = td->td_pcb; 627 628 /* Copy the upcall pcb */ 629 bcopy(td0->td_pcb, pcb2, sizeof(*pcb2)); 630 631 /* Create a stack for the new thread */ 632 tf = td->td_frame; 633 bcopy(td0->td_frame, tf, sizeof(struct trapframe)); 634 tf->fixreg[FIRSTARG] = 0; 635 tf->fixreg[FIRSTARG + 1] = 0; 636 tf->cr &= ~0x10000000; 637 638 /* Set registers for trampoline to user mode. */ 639 cf = (struct callframe *)tf - 1; 640 memset(cf, 0, sizeof(struct callframe)); 641 cf->cf_func = (register_t)fork_return; 642 cf->cf_arg0 = (register_t)td; 643 cf->cf_arg1 = (register_t)tf; 644 645 pcb2->pcb_sp = (register_t)cf; 646 pcb2->pcb_lr = (register_t)fork_trampoline; 647 pcb2->pcb_cpu.aim.usr = 0; 648 649 /* Setup to release spin count in fork_exit(). */ 650 td->td_md.md_spinlock_count = 1; 651 td->td_md.md_saved_msr = PSL_KERNSET; 652 } 653 654 void 655 cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg, 656 stack_t *stack) 657 { 658 struct trapframe *tf; 659 uintptr_t sp; 660 661 tf = td->td_frame; 662 /* align stack and alloc space for frame ptr and saved LR */ 663 sp = ((uintptr_t)stack->ss_sp + stack->ss_size - 8) & 664 ~0x1f; 665 bzero(tf, sizeof(struct trapframe)); 666 667 tf->fixreg[1] = (register_t)sp; 668 tf->fixreg[3] = (register_t)arg; 669 tf->srr0 = (register_t)entry; 670 #ifdef AIM 671 tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 672 #else 673 tf->srr1 = PSL_USERSET; 674 #endif 675 676 td->td_pcb->pcb_flags = 0; 677 678 td->td_retval[0] = (register_t)entry; 679 td->td_retval[1] = 0; 680 } 681
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