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/frame.h> 40 #include <machine/gdb_machdep.h> 41 #include <machine/pcb.h> 42 #include <machine/psl.h> 43 #include <machine/reg.h> 44 #include <machine/trap.h> 45 #include <machine/frame.h> 46 #include <machine/endian.h> 47 48 #include <gdb/gdb.h> 49 50 void * 51 gdb_cpu_getreg(int regnum, size_t *regsz) 52 { 53 static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL); 54 static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL); 55 56 *regsz = gdb_cpu_regsz(regnum); 57 58 if (kdb_thread == curthread) { 59 switch (regnum) { 60 case 0: return (&kdb_frame->tf_rax); 61 case 2: return (&kdb_frame->tf_rcx); 62 case 3: return (&kdb_frame->tf_rdx); 63 case 4: return (&kdb_frame->tf_rsi); 64 case 5: return (&kdb_frame->tf_rdi); 65 case 8: return (&kdb_frame->tf_r8); 66 case 9: return (&kdb_frame->tf_r9); 67 case 10: return (&kdb_frame->tf_r10); 68 case 11: return (&kdb_frame->tf_r11); 69 case 17: return (&kdb_frame->tf_rflags); 70 case 18: return (&kdb_frame->tf_cs); 71 case 19: return (&kdb_frame->tf_ss); 72 } 73 } 74 switch (regnum) { 75 case 1: return (&kdb_thrctx->pcb_rbx); 76 case 6: return (&kdb_thrctx->pcb_rbp); 77 case 7: return (&kdb_thrctx->pcb_rsp); 78 case 12: return (&kdb_thrctx->pcb_r12); 79 case 13: return (&kdb_thrctx->pcb_r13); 80 case 14: return (&kdb_thrctx->pcb_r14); 81 case 15: return (&kdb_thrctx->pcb_r15); 82 case 16: return (&kdb_thrctx->pcb_rip); 83 case 18: return (&_kcodesel); 84 case 19: return (&_kdatasel); 85 } 86 return (NULL); 87 } 88 89 void 90 gdb_cpu_setreg(int regnum, void *val) 91 { 92 93 switch (regnum) { 94 case GDB_REG_PC: 95 kdb_thrctx->pcb_rip = *(register_t *)val; 96 if (kdb_thread == curthread) 97 kdb_frame->tf_rip = *(register_t *)val; 98 } 99 } 100 101 int 102 gdb_cpu_signal(int type, int code) 103 { 104 105 switch (type & ~T_USER) { 106 case 0: return (SIGFPE); /* Divide by zero. */ 107 case 1: return (SIGTRAP); /* Debug exception. */ 108 case 3: return (SIGTRAP); /* Breakpoint. */ 109 case 4: return (SIGSEGV); /* into instr. (overflow). */ 110 case 5: return (SIGURG); /* bound instruction. */ 111 case 6: return (SIGILL); /* Invalid opcode. */ 112 case 7: return (SIGFPE); /* Coprocessor not present. */ 113 case 8: return (SIGEMT); /* Double fault. */ 114 case 9: return (SIGSEGV); /* Coprocessor segment overrun. */ 115 case 10: return (SIGTRAP); /* Invalid TSS (also single-step). */ 116 case 11: return (SIGSEGV); /* Segment not present. */ 117 case 12: return (SIGSEGV); /* Stack exception. */ 118 case 13: return (SIGSEGV); /* General protection. */ 119 case 14: return (SIGSEGV); /* Page fault. */ 120 case 16: return (SIGEMT); /* Coprocessor error. */ 121 } 122 return (SIGEMT); 123 } 124