1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2021 Mitchell Horne <mhorne@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kdb.h> 32 #include <sys/kernel.h> 33 #include <sys/proc.h> 34 #include <sys/signal.h> 35 36 #include <machine/frame.h> 37 #include <machine/gdb_machdep.h> 38 #include <machine/pcb.h> 39 #include <machine/riscvreg.h> 40 41 #include <gdb/gdb.h> 42 43 void * 44 gdb_cpu_getreg(int regnum, size_t *regsz) 45 { 46 *regsz = gdb_cpu_regsz(regnum); 47 48 if (kdb_thread == curthread) { 49 switch (regnum) { 50 case GDB_REG_RA: return (&kdb_frame->tf_ra); 51 case GDB_REG_PC: return (&kdb_frame->tf_sepc); 52 case GDB_REG_SSTATUS: return (&kdb_frame->tf_sstatus); 53 case GDB_REG_STVAL: return (&kdb_frame->tf_stval); 54 case GDB_REG_SCAUSE: return (&kdb_frame->tf_scause); 55 default: 56 if (regnum >= GDB_REG_A0 && regnum < GDB_REG_S2) 57 return (&kdb_frame->tf_a[regnum - GDB_REG_A0]); 58 if (regnum >= GDB_REG_T0 && regnum < GDB_REG_FP) 59 return (&kdb_frame->tf_t[regnum - GDB_REG_T0]); 60 if (regnum >= GDB_REG_T3 && regnum < GDB_REG_PC) 61 return (&kdb_frame->tf_t[regnum - GDB_REG_T3]); 62 break; 63 } 64 } 65 switch (regnum) { 66 case GDB_REG_PC: /* FALLTHROUGH */ 67 case GDB_REG_RA: return (&kdb_thrctx->pcb_ra); 68 case GDB_REG_SP: return (&kdb_thrctx->pcb_sp); 69 case GDB_REG_GP: return (&kdb_thrctx->pcb_gp); 70 case GDB_REG_TP: return (&kdb_thrctx->pcb_tp); 71 case GDB_REG_FP: return (&kdb_thrctx->pcb_s[0]); 72 case GDB_REG_S1: return (&kdb_thrctx->pcb_s[1]); 73 default: 74 if (regnum >= GDB_REG_S2 && regnum < GDB_REG_T3) 75 return (&kdb_thrctx->pcb_s[regnum - GDB_REG_S2]); 76 break; 77 } 78 79 return (NULL); 80 } 81 82 void 83 gdb_cpu_setreg(int regnum, void *val) 84 { 85 register_t regval = *(register_t *)val; 86 87 /* For curthread, keep the pcb and trapframe in sync. */ 88 if (kdb_thread == curthread) { 89 switch (regnum) { 90 case GDB_REG_PC: kdb_frame->tf_sepc = regval; break; 91 case GDB_REG_RA: kdb_frame->tf_ra = regval; break; 92 case GDB_REG_SP: kdb_frame->tf_sp = regval; break; 93 case GDB_REG_GP: kdb_frame->tf_gp = regval; break; 94 case GDB_REG_TP: kdb_frame->tf_tp = regval; break; 95 case GDB_REG_FP: kdb_frame->tf_s[0] = regval; break; 96 case GDB_REG_S1: kdb_frame->tf_s[1] = regval; break; 97 case GDB_REG_SSTATUS: kdb_frame->tf_sstatus = regval; break; 98 case GDB_REG_STVAL: kdb_frame->tf_stval = regval; break; 99 case GDB_REG_SCAUSE: kdb_frame->tf_scause = regval; break; 100 default: 101 if (regnum >= GDB_REG_A0 && regnum < GDB_REG_S2) 102 kdb_frame->tf_a[regnum - GDB_REG_A0] = regval; 103 if (regnum >= GDB_REG_S2 && regnum < GDB_REG_T3) 104 kdb_frame->tf_s[regnum - GDB_REG_S2] = regval; 105 if (regnum >= GDB_REG_T0 && regnum < GDB_REG_FP) 106 kdb_frame->tf_t[regnum - GDB_REG_T0] = regval; 107 if (regnum >= GDB_REG_T3 && regnum < GDB_REG_PC) 108 kdb_frame->tf_t[regnum - GDB_REG_T3] = regval; 109 break; 110 } 111 } 112 switch (regnum) { 113 case GDB_REG_PC: /* FALLTHROUGH */ 114 case GDB_REG_RA: kdb_thrctx->pcb_ra = regval; break; 115 case GDB_REG_SP: kdb_thrctx->pcb_sp = regval; break; 116 case GDB_REG_GP: kdb_thrctx->pcb_gp = regval; break; 117 case GDB_REG_TP: kdb_thrctx->pcb_tp = regval; break; 118 case GDB_REG_FP: kdb_thrctx->pcb_s[0] = regval; break; 119 case GDB_REG_S1: kdb_thrctx->pcb_s[1] = regval; break; 120 default: 121 if (regnum >= GDB_REG_S2 && regnum < GDB_REG_T3) 122 kdb_thrctx->pcb_s[regnum - GDB_REG_S2] = regval; 123 break; 124 } 125 } 126 127 int 128 gdb_cpu_signal(int type, int code) 129 { 130 131 if (type == SCAUSE_BREAKPOINT) 132 return (SIGTRAP); 133 134 return (SIGEMT); 135 } 136