1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kdb.h> 33 #include <sys/kernel.h> 34 #include <sys/proc.h> 35 #include <sys/signal.h> 36 37 #include <machine/gdb_machdep.h> 38 #include <machine/db_machdep.h> 39 #include <machine/vmparam.h> 40 #include <machine/pcb.h> 41 #include <machine/trap.h> 42 #include <machine/frame.h> 43 #include <machine/endian.h> 44 45 #include <gdb/gdb.h> 46 47 static register_t stacktest; 48 49 void * 50 gdb_cpu_getreg(int regnum, size_t *regsz) 51 { 52 53 *regsz = gdb_cpu_regsz(regnum); 54 55 if (kdb_thread == curthread) { 56 if (regnum < 13) 57 return (&kdb_frame->tf_r0 + regnum); 58 if (regnum == 13) 59 return (&kdb_frame->tf_svc_sp); 60 if (regnum == 14) 61 return (&kdb_frame->tf_svc_lr); 62 if (regnum == 15) 63 return (&kdb_frame->tf_pc); 64 if (regnum == 25) 65 return (&kdb_frame->tf_spsr); 66 } 67 68 switch (regnum) { 69 case 4: return (&kdb_thrctx->pcb_regs.sf_r4); 70 case 5: return (&kdb_thrctx->pcb_regs.sf_r5); 71 case 6: return (&kdb_thrctx->pcb_regs.sf_r6); 72 case 7: return (&kdb_thrctx->pcb_regs.sf_r7); 73 case 8: return (&kdb_thrctx->pcb_regs.sf_r8); 74 case 9: return (&kdb_thrctx->pcb_regs.sf_r9); 75 case 10: return (&kdb_thrctx->pcb_regs.sf_r10); 76 case 11: return (&kdb_thrctx->pcb_regs.sf_r11); 77 case 12: return (&kdb_thrctx->pcb_regs.sf_r12); 78 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4; 79 return (&stacktest); 80 case 15: 81 /* 82 * On context switch, the PC is not put in the PCB, but 83 * we can retrieve it from the stack. 84 */ 85 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) { 86 kdb_thrctx->pcb_regs.sf_pc = *(register_t *) 87 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4); 88 return (&kdb_thrctx->pcb_regs.sf_pc); 89 } 90 } 91 92 return (NULL); 93 } 94 95 void 96 gdb_cpu_setreg(int regnum, void *val) 97 { 98 if (kdb_thread != curthread) 99 return; 100 101 switch (regnum) { 102 case GDB_REG_PC: 103 kdb_frame->tf_pc = *(register_t *)val; 104 break; 105 case GDB_REG_SP: 106 kdb_frame->tf_svc_sp = *(register_t *)val; 107 break; 108 case GDB_REG_LR: 109 kdb_frame->tf_svc_lr = *(register_t *)val; 110 break; 111 default: 112 /* Write to the general purpose registers r0-r12. */ 113 if (regnum >= 0 && regnum <= 12) { 114 *(&kdb_frame->tf_r0 + regnum) = *(register_t *)val; 115 } 116 break; 117 } 118 } 119 120 int 121 gdb_cpu_signal(int type, int code) 122 { 123 124 switch (type) { 125 case T_BREAKPOINT: return (SIGTRAP); 126 } 127 return (SIGEMT); 128 } 129