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 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kdb.h> 35 #include <sys/kernel.h> 36 #include <sys/proc.h> 37 #include <sys/signal.h> 38 39 #include <machine/gdb_machdep.h> 40 #include <machine/db_machdep.h> 41 #include <machine/vmparam.h> 42 #include <machine/pcb.h> 43 #include <machine/trap.h> 44 #include <machine/frame.h> 45 #include <machine/endian.h> 46 47 #include <gdb/gdb.h> 48 49 static register_t stacktest; 50 51 void * 52 gdb_cpu_getreg(int regnum, size_t *regsz) 53 { 54 55 *regsz = gdb_cpu_regsz(regnum); 56 57 if (kdb_thread == curthread) { 58 if (regnum < 13) 59 return (&kdb_frame->tf_r0 + regnum); 60 if (regnum == 13) 61 return (&kdb_frame->tf_svc_sp); 62 if (regnum == 14) 63 return (&kdb_frame->tf_svc_lr); 64 if (regnum == 15) 65 return (&kdb_frame->tf_pc); 66 if (regnum == 25) 67 return (&kdb_frame->tf_spsr); 68 } 69 70 switch (regnum) { 71 case 4: return (&kdb_thrctx->pcb_regs.sf_r4); 72 case 5: return (&kdb_thrctx->pcb_regs.sf_r5); 73 case 6: return (&kdb_thrctx->pcb_regs.sf_r6); 74 case 7: return (&kdb_thrctx->pcb_regs.sf_r7); 75 case 8: return (&kdb_thrctx->pcb_regs.sf_r8); 76 case 9: return (&kdb_thrctx->pcb_regs.sf_r9); 77 case 10: return (&kdb_thrctx->pcb_regs.sf_r10); 78 case 11: return (&kdb_thrctx->pcb_regs.sf_r11); 79 case 12: return (&kdb_thrctx->pcb_regs.sf_r12); 80 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4; 81 return (&stacktest); 82 case 15: 83 /* 84 * On context switch, the PC is not put in the PCB, but 85 * we can retrieve it from the stack. 86 */ 87 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) { 88 kdb_thrctx->pcb_regs.sf_pc = *(register_t *) 89 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4); 90 return (&kdb_thrctx->pcb_regs.sf_pc); 91 } 92 } 93 94 return (NULL); 95 } 96 97 void 98 gdb_cpu_setreg(int regnum, void *val) 99 { 100 if (kdb_thread != curthread) 101 return; 102 103 switch (regnum) { 104 case GDB_REG_PC: 105 kdb_frame->tf_pc = *(register_t *)val; 106 break; 107 case GDB_REG_SP: 108 kdb_frame->tf_svc_sp = *(register_t *)val; 109 break; 110 case GDB_REG_LR: 111 kdb_frame->tf_svc_lr = *(register_t *)val; 112 break; 113 default: 114 /* Write to the general purpose registers r0-r12. */ 115 if (regnum >= 0 && regnum <= 12) { 116 *(&kdb_frame->tf_r0 + regnum) = *(register_t *)val; 117 } 118 break; 119 } 120 } 121 122 int 123 gdb_cpu_signal(int type, int code) 124 { 125 126 switch (type) { 127 case T_BREAKPOINT: return (SIGTRAP); 128 } 129 return (SIGEMT); 130 } 131