1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2020 The FreeBSD Foundation 5 * 6 * This software was developed by Mitchell Horne under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 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/armreg.h> 39 #include <machine/frame.h> 40 #include <machine/gdb_machdep.h> 41 #include <machine/pcb.h> 42 43 #include <gdb/gdb.h> 44 #include <gdb/gdb_int.h> 45 46 void * 47 gdb_cpu_getreg(int regnum, size_t *regsz) 48 { 49 50 *regsz = gdb_cpu_regsz(regnum); 51 52 if (kdb_thread == curthread) { 53 switch (regnum) { 54 case GDB_REG_LR: return (&kdb_frame->tf_lr); 55 case GDB_REG_SP: return (&kdb_frame->tf_sp); 56 case GDB_REG_PC: return (&kdb_frame->tf_elr); 57 case GDB_REG_CSPR: return (&kdb_frame->tf_spsr); 58 } 59 } 60 switch (regnum) { 61 case GDB_REG_SP: return (&kdb_thrctx->pcb_sp); 62 case GDB_REG_PC: /* FALLTHROUGH */ 63 case GDB_REG_LR: return (&kdb_thrctx->pcb_lr); 64 default: 65 if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) 66 return (&kdb_thrctx->pcb_x[regnum]); 67 break; 68 } 69 70 return (NULL); 71 } 72 73 void 74 gdb_cpu_setreg(int regnum, void *val) 75 { 76 register_t regval = *(register_t *)val; 77 78 /* For curthread, keep the pcb and trapframe in sync. */ 79 if (kdb_thread == curthread) { 80 switch (regnum) { 81 case GDB_REG_PC: kdb_frame->tf_elr = regval; break; 82 case GDB_REG_SP: kdb_frame->tf_sp = regval; break; 83 default: 84 if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) { 85 kdb_frame->tf_x[regnum] = regval; 86 } 87 break; 88 } 89 } 90 switch (regnum) { 91 case GDB_REG_PC: /* FALLTHROUGH */ 92 case GDB_REG_LR: kdb_thrctx->pcb_lr = regval; break; 93 case GDB_REG_SP: kdb_thrctx->pcb_sp = regval; break; 94 default: 95 if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) { 96 kdb_thrctx->pcb_x[regnum] = regval; 97 } 98 break; 99 } 100 } 101 102 int 103 gdb_cpu_signal(int type, int code __unused) 104 { 105 106 switch (type) { 107 case EXCP_WATCHPT_EL1: 108 case EXCP_SOFTSTP_EL1: 109 case EXCP_BRK: 110 return (SIGTRAP); 111 } 112 return (SIGEMT); 113 } 114 115 void 116 gdb_cpu_stop_reason(int type, int code __unused) 117 { 118 119 if (type == EXCP_WATCHPT_EL1) { 120 gdb_tx_str("watch:"); 121 gdb_tx_varhex((uintmax_t)READ_SPECIALREG(far_el1)); 122 gdb_tx_char(';'); 123 } 124 } 125