1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 Marcel Moolenaar 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/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 void * 48 gdb_cpu_getreg(int regnum, size_t *regsz) 49 { 50 static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL); 51 static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL); 52 static uint32_t _kprivsel = GSEL(GPRIV_SEL, SEL_KPL); 53 54 *regsz = gdb_cpu_regsz(regnum); 55 56 if (kdb_thread == curthread) { 57 switch (regnum) { 58 case 0: return (&kdb_frame->tf_eax); 59 case 1: return (&kdb_frame->tf_ecx); 60 case 2: return (&kdb_frame->tf_edx); 61 case 9: return (&kdb_frame->tf_eflags); 62 case 10: return (&kdb_frame->tf_cs); 63 case 12: return (&kdb_frame->tf_ds); 64 case 13: return (&kdb_frame->tf_es); 65 case 14: return (&kdb_frame->tf_fs); 66 } 67 } 68 switch (regnum) { 69 case 3: return (&kdb_thrctx->pcb_ebx); 70 case 4: return (&kdb_thrctx->pcb_esp); 71 case 5: return (&kdb_thrctx->pcb_ebp); 72 case 6: return (&kdb_thrctx->pcb_esi); 73 case 7: return (&kdb_thrctx->pcb_edi); 74 case 8: return (&kdb_thrctx->pcb_eip); 75 case 10: return (&_kcodesel); 76 case 11: return (&_kdatasel); 77 case 12: return (&_kdatasel); 78 case 13: return (&_kdatasel); 79 case 14: return (&_kprivsel); 80 case 15: return (&kdb_thrctx->pcb_gs); 81 } 82 return (NULL); 83 } 84 85 void 86 gdb_cpu_setreg(int regnum, void *val) 87 { 88 89 switch (regnum) { 90 case GDB_REG_PC: 91 kdb_thrctx->pcb_eip = *(register_t *)val; 92 if (kdb_thread == curthread) 93 kdb_frame->tf_eip = *(register_t *)val; 94 } 95 } 96 97 int 98 gdb_cpu_signal(int type, int code) 99 { 100 101 switch (type & ~T_USER) { 102 case 0: return (SIGFPE); /* Divide by zero. */ 103 case 1: return (SIGTRAP); /* Debug exception. */ 104 case 3: return (SIGTRAP); /* Breakpoint. */ 105 case 4: return (SIGURG); /* into instr. (overflow). */ 106 case 5: return (SIGURG); /* bound instruction. */ 107 case 6: return (SIGILL); /* Invalid opcode. */ 108 case 7: return (SIGFPE); /* Coprocessor not present. */ 109 case 8: return (SIGEMT); /* Double fault. */ 110 case 9: return (SIGSEGV); /* Coprocessor segment overrun. */ 111 case 10: return (SIGTRAP); /* Invalid TSS (also single-step). */ 112 case 11: return (SIGSEGV); /* Segment not present. */ 113 case 12: return (SIGSEGV); /* Stack exception. */ 114 case 13: return (SIGSEGV); /* General protection. */ 115 case 14: return (SIGSEGV); /* Page fault. */ 116 case 16: return (SIGEMT); /* Coprocessor error. */ 117 } 118 return (SIGEMT); 119 } 120