1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2006 Olivier Houchard 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kdb.h> 36 #include <sys/kernel.h> 37 #include <sys/proc.h> 38 #include <sys/signal.h> 39 40 #include <machine/gdb_machdep.h> 41 #include <machine/db_machdep.h> 42 #include <machine/vmparam.h> 43 #include <machine/pcb.h> 44 #include <machine/trap.h> 45 #include <machine/frame.h> 46 #include <machine/endian.h> 47 48 #include <gdb/gdb.h> 49 50 static register_t stacktest; 51 52 void * 53 gdb_cpu_getreg(int regnum, size_t *regsz) 54 { 55 56 *regsz = gdb_cpu_regsz(regnum); 57 58 if (kdb_thread == curthread) { 59 if (regnum < 13) 60 return (&kdb_frame->tf_r0 + regnum); 61 if (regnum == 13) 62 return (&kdb_frame->tf_svc_sp); 63 if (regnum == 14) 64 return (&kdb_frame->tf_svc_lr); 65 if (regnum == 15) 66 return (&kdb_frame->tf_pc); 67 if (regnum == 25) 68 return (&kdb_frame->tf_spsr); 69 } 70 71 switch (regnum) { 72 case 4: return (&kdb_thrctx->pcb_regs.sf_r4); 73 case 5: return (&kdb_thrctx->pcb_regs.sf_r5); 74 case 6: return (&kdb_thrctx->pcb_regs.sf_r6); 75 case 7: return (&kdb_thrctx->pcb_regs.sf_r7); 76 case 8: return (&kdb_thrctx->pcb_regs.sf_r8); 77 case 9: return (&kdb_thrctx->pcb_regs.sf_r9); 78 case 10: return (&kdb_thrctx->pcb_regs.sf_r10); 79 case 11: return (&kdb_thrctx->pcb_regs.sf_r11); 80 case 12: return (&kdb_thrctx->pcb_regs.sf_r12); 81 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4; 82 return (&stacktest); 83 case 15: 84 /* 85 * On context switch, the PC is not put in the PCB, but 86 * we can retrieve it from the stack. 87 */ 88 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) { 89 kdb_thrctx->pcb_regs.sf_pc = *(register_t *) 90 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4); 91 return (&kdb_thrctx->pcb_regs.sf_pc); 92 } 93 } 94 95 return (NULL); 96 } 97 98 void 99 gdb_cpu_setreg(int regnum, void *val) 100 { 101 102 switch (regnum) { 103 case GDB_REG_PC: 104 if (kdb_thread == curthread) 105 kdb_frame->tf_pc = *(register_t *)val; 106 } 107 } 108 109 int 110 gdb_cpu_signal(int type, int code) 111 { 112 113 switch (type) { 114 case T_BREAKPOINT: return (SIGTRAP); 115 } 116 return (SIGEMT); 117 } 118