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/cpufunc.h> 40 #include <machine/frame.h> 41 #include <machine/gdb_machdep.h> 42 #include <machine/md_var.h> 43 #include <machine/pcb.h> 44 #include <machine/psl.h> 45 #include <machine/reg.h> 46 #include <machine/specialreg.h> 47 #include <machine/trap.h> 48 #include <machine/frame.h> 49 #include <machine/endian.h> 50 51 #include <gdb/gdb.h> 52 53 void * 54 gdb_cpu_getreg(int regnum, size_t *regsz) 55 { 56 static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL); 57 static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL); 58 59 *regsz = gdb_cpu_regsz(regnum); 60 61 if (kdb_thread == curthread) { 62 switch (regnum) { 63 case 0: return (&kdb_frame->tf_rax); 64 case 2: return (&kdb_frame->tf_rcx); 65 case 3: return (&kdb_frame->tf_rdx); 66 case 4: return (&kdb_frame->tf_rsi); 67 case 5: return (&kdb_frame->tf_rdi); 68 case 8: return (&kdb_frame->tf_r8); 69 case 9: return (&kdb_frame->tf_r9); 70 case 10: return (&kdb_frame->tf_r10); 71 case 11: return (&kdb_frame->tf_r11); 72 case 17: return (&kdb_frame->tf_rflags); 73 case 18: return (&kdb_frame->tf_cs); 74 case 19: return (&kdb_frame->tf_ss); 75 } 76 } 77 switch (regnum) { 78 case 1: return (&kdb_thrctx->pcb_rbx); 79 case 6: return (&kdb_thrctx->pcb_rbp); 80 case 7: return (&kdb_thrctx->pcb_rsp); 81 case 12: return (&kdb_thrctx->pcb_r12); 82 case 13: return (&kdb_thrctx->pcb_r13); 83 case 14: return (&kdb_thrctx->pcb_r14); 84 case 15: return (&kdb_thrctx->pcb_r15); 85 case 16: return (&kdb_thrctx->pcb_rip); 86 case 18: return (&_kcodesel); 87 case 19: return (&_kdatasel); 88 } 89 return (NULL); 90 } 91 92 void 93 gdb_cpu_setreg(int regnum, void *val) 94 { 95 96 switch (regnum) { 97 case GDB_REG_PC: 98 kdb_thrctx->pcb_rip = *(register_t *)val; 99 if (kdb_thread == curthread) 100 kdb_frame->tf_rip = *(register_t *)val; 101 } 102 } 103 104 int 105 gdb_cpu_signal(int type, int code) 106 { 107 108 switch (type & ~T_USER) { 109 case 0: return (SIGFPE); /* Divide by zero. */ 110 case 1: return (SIGTRAP); /* Debug exception. */ 111 case 3: return (SIGTRAP); /* Breakpoint. */ 112 case 4: return (SIGSEGV); /* into instr. (overflow). */ 113 case 5: return (SIGURG); /* bound instruction. */ 114 case 6: return (SIGILL); /* Invalid opcode. */ 115 case 7: return (SIGFPE); /* Coprocessor not present. */ 116 case 8: return (SIGEMT); /* Double fault. */ 117 case 9: return (SIGSEGV); /* Coprocessor segment overrun. */ 118 case 10: return (SIGTRAP); /* Invalid TSS (also single-step). */ 119 case 11: return (SIGSEGV); /* Segment not present. */ 120 case 12: return (SIGSEGV); /* Stack exception. */ 121 case 13: return (SIGSEGV); /* General protection. */ 122 case 14: return (SIGSEGV); /* Page fault. */ 123 case 16: return (SIGEMT); /* Coprocessor error. */ 124 } 125 return (SIGEMT); 126 } 127 128 void * 129 gdb_begin_write(void) 130 { 131 132 return (disable_wp() ? &gdb_begin_write : NULL); 133 } 134 135 void 136 gdb_end_write(void *arg) 137 { 138 139 restore_wp(arg != NULL); 140 } 141 142