1/*- 2 * Copyright (c) 2006 Olivier Houchard 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 * 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/kdb.h> 34#include <sys/kernel.h> 35#include <sys/proc.h> 36#include <sys/signal.h> 37 38#include <machine/gdb_machdep.h> 39#include <machine/db_machdep.h> 40#include <machine/vmparam.h> 41#include <machine/pcb.h> 42#include <machine/trap.h> 43#include <machine/frame.h> 44#include <machine/endian.h> 45 46#include <gdb/gdb.h> 47 48static register_t stacktest; 49 50void * 51gdb_cpu_getreg(int regnum, size_t *regsz) 52{ 53 54 *regsz = gdb_cpu_regsz(regnum); 55 56 if (kdb_thread == curthread) { 57 if (regnum < 15) 58 return (&kdb_frame->tf_r0 + regnum); 59 if (regnum == 15) 60 return (&kdb_frame->tf_pc); 61 if (regnum == 25) 62 return (&kdb_frame->tf_spsr); 63 } 64 65 switch (regnum) { 66 case 8: return (&kdb_thrctx->un_32.pcb32_r8); 67 case 9: return (&kdb_thrctx->un_32.pcb32_r9); 68 case 10: return (&kdb_thrctx->un_32.pcb32_r10); 69 case 11: return (&kdb_thrctx->un_32.pcb32_r11); 70 case 12: return (&kdb_thrctx->un_32.pcb32_r12); 71 case 13: stacktest = kdb_thrctx->un_32.pcb32_sp + 5 * 4; 72 return (&stacktest); 73 case 15: 74 /* 75 * On context switch, the PC is not put in the PCB, but 76 * we can retrieve it from the stack. 77 */ 78 if (kdb_thrctx->un_32.pcb32_sp > KERNBASE) { 79 kdb_thrctx->un_32.pcb32_pc = *(register_t *) 80 (kdb_thrctx->un_32.pcb32_sp + 4 * 4); 81 return (&kdb_thrctx->un_32.pcb32_pc); 82 } 83 } 84 85 return (NULL); 86} 87 88void 89gdb_cpu_setreg(int regnum, void *val) 90{ 91 92 switch (regnum) { 93 case GDB_REG_PC: 94 if (kdb_thread == curthread) 95 kdb_frame->tf_pc = *(register_t *)val; 96 } 97} 98 99int 100gdb_cpu_signal(int type, int code) 101{ 102 103 switch (type) { 104 case T_BREAKPOINT: return (SIGTRAP); 105 } 106 return (SIGEMT); 107} 108