gdb_machdep.c revision 331722
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: stable/11/sys/arm/arm/gdb_machdep.c 331722 2018-03-29 02:50:57Z eadler $"); 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 < 13) 58 return (&kdb_frame->tf_r0 + regnum); 59 if (regnum == 13) 60 return (&kdb_frame->tf_svc_sp); 61 if (regnum == 14) 62 return (&kdb_frame->tf_svc_lr); 63 if (regnum == 15) 64 return (&kdb_frame->tf_pc); 65 if (regnum == 25) 66 return (&kdb_frame->tf_spsr); 67 } 68 69 switch (regnum) { 70 case 4: return (&kdb_thrctx->pcb_regs.sf_r4); 71 case 5: return (&kdb_thrctx->pcb_regs.sf_r5); 72 case 6: return (&kdb_thrctx->pcb_regs.sf_r6); 73 case 7: return (&kdb_thrctx->pcb_regs.sf_r7); 74 case 8: return (&kdb_thrctx->pcb_regs.sf_r8); 75 case 9: return (&kdb_thrctx->pcb_regs.sf_r9); 76 case 10: return (&kdb_thrctx->pcb_regs.sf_r10); 77 case 11: return (&kdb_thrctx->pcb_regs.sf_r11); 78 case 12: return (&kdb_thrctx->pcb_regs.sf_r12); 79 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4; 80 return (&stacktest); 81 case 15: 82 /* 83 * On context switch, the PC is not put in the PCB, but 84 * we can retrieve it from the stack. 85 */ 86 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) { 87 kdb_thrctx->pcb_regs.sf_pc = *(register_t *) 88 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4); 89 return (&kdb_thrctx->pcb_regs.sf_pc); 90 } 91 } 92 93 return (NULL); 94} 95 96void 97gdb_cpu_setreg(int regnum, void *val) 98{ 99 100 switch (regnum) { 101 case GDB_REG_PC: 102 if (kdb_thread == curthread) 103 kdb_frame->tf_pc = *(register_t *)val; 104 } 105} 106 107int 108gdb_cpu_signal(int type, int code) 109{ 110 111 switch (type) { 112 case T_BREAKPOINT: return (SIGTRAP); 113 } 114 return (SIGEMT); 115} 116