1 /* $NetBSD: arm_machdep.c,v 1.5 2002/04/03 23:33:27 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1994-1998 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Mark Brinicombe 21 * for the NetBSD Project. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include "opt_compat_netbsd.h" 40 41 #include <sys/param.h> 42 43 __KERNEL_RCSID(0, "$NetBSD: arm_machdep.c,v 1.5 2002/04/03 23:33:27 thorpej Exp $"); 44 45 #include <sys/exec.h> 46 #include <sys/proc.h> 47 #include <sys/systm.h> 48 #include <sys/user.h> 49 50 #include <machine/pcb.h> 51 #include <machine/vmparam.h> 52 53 /* 54 * The ARM architecture places the vector page at address 0. 55 * Later ARM architecture versions, however, allow it to be 56 * relocated to a high address (0xffff0000). This is primarily 57 * to support the Fast Context Switch Extension. 58 * 59 * This variable contains the address of the vector page. It 60 * defaults to 0; it only needs to be initialized if we enable 61 * relocated vectors. 62 */ 63 vaddr_t vector_page; 64 65 /* 66 * Clear registers on exec 67 */ 68 69 void 70 setregs(struct proc *p, struct exec_package *pack, u_long stack) 71 { 72 struct trapframe *tf; 73 74 tf = p->p_addr->u_pcb.pcb_tf; 75 76 memset(tf, 0, sizeof(*tf)); 77 tf->tf_r0 = (u_int)p->p_psstr; 78 #ifdef COMPAT_13 79 tf->tf_r12 = stack; /* needed by pre 1.4 crt0.c */ 80 #endif 81 tf->tf_usr_sp = stack; 82 tf->tf_usr_lr = pack->ep_entry; 83 tf->tf_svc_lr = 0x77777777; /* Something we can see */ 84 tf->tf_pc = pack->ep_entry; 85 #ifdef __PROG32 86 tf->tf_spsr = PSR_USR32_MODE; 87 #endif 88 89 p->p_addr->u_pcb.pcb_flags = 0; 90 } 91