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 GDB_REG_RAX: return (&kdb_frame->tf_rax); 64 case GDB_REG_RCX: return (&kdb_frame->tf_rcx); 65 case GDB_REG_RDX: return (&kdb_frame->tf_rdx); 66 case GDB_REG_RSI: return (&kdb_frame->tf_rsi); 67 case GDB_REG_RDI: return (&kdb_frame->tf_rdi); 68 case GDB_REG_R8: return (&kdb_frame->tf_r8); 69 case GDB_REG_R9: return (&kdb_frame->tf_r9); 70 case GDB_REG_R10: return (&kdb_frame->tf_r10); 71 case GDB_REG_R11: return (&kdb_frame->tf_r11); 72 case GDB_REG_RFLAGS: return (&kdb_frame->tf_rflags); 73 case GDB_REG_CS: return (&kdb_frame->tf_cs); 74 case GDB_REG_SS: return (&kdb_frame->tf_ss); 75 } 76 } 77 switch (regnum) { 78 case GDB_REG_RBX: return (&kdb_thrctx->pcb_rbx); 79 case GDB_REG_RBP: return (&kdb_thrctx->pcb_rbp); 80 case GDB_REG_RSP: return (&kdb_thrctx->pcb_rsp); 81 case GDB_REG_R12: return (&kdb_thrctx->pcb_r12); 82 case GDB_REG_R13: return (&kdb_thrctx->pcb_r13); 83 case GDB_REG_R14: return (&kdb_thrctx->pcb_r14); 84 case GDB_REG_R15: return (&kdb_thrctx->pcb_r15); 85 case GDB_REG_PC: return (&kdb_thrctx->pcb_rip); 86 case GDB_REG_CS: return (&_kcodesel); 87 case GDB_REG_SS: return (&_kdatasel); 88 } 89 return (NULL); 90 } 91 92 void 93 gdb_cpu_setreg(int regnum, void *val) 94 { 95 register_t regval = *(register_t *)val; 96 97 /* 98 * Write registers to the trapframe and pcb, if applicable. 99 * Some scratch registers are not tracked by the pcb. 100 */ 101 if (kdb_thread == curthread) { 102 switch (regnum) { 103 case GDB_REG_RAX: kdb_frame->tf_rax = regval; break; 104 case GDB_REG_RBX: kdb_frame->tf_rbx = regval; break; 105 case GDB_REG_RCX: kdb_frame->tf_rcx = regval; break; 106 case GDB_REG_RDX: kdb_frame->tf_rdx = regval; break; 107 case GDB_REG_RSI: kdb_frame->tf_rsi = regval; break; 108 case GDB_REG_RDI: kdb_frame->tf_rdi = regval; break; 109 case GDB_REG_RBP: kdb_frame->tf_rbp = regval; break; 110 case GDB_REG_RSP: kdb_frame->tf_rsp = regval; break; 111 case GDB_REG_R8: kdb_frame->tf_r8 = regval; break; 112 case GDB_REG_R9: kdb_frame->tf_r9 = regval; break; 113 case GDB_REG_R10: kdb_frame->tf_r10 = regval; break; 114 case GDB_REG_R11: kdb_frame->tf_r11 = regval; break; 115 case GDB_REG_R12: kdb_frame->tf_r12 = regval; break; 116 case GDB_REG_R13: kdb_frame->tf_r13 = regval; break; 117 case GDB_REG_R14: kdb_frame->tf_r14 = regval; break; 118 case GDB_REG_R15: kdb_frame->tf_r15 = regval; break; 119 case GDB_REG_PC: kdb_frame->tf_rip = regval; break; 120 } 121 } 122 switch (regnum) { 123 case GDB_REG_RBX: kdb_thrctx->pcb_rbx = regval; break; 124 case GDB_REG_RBP: kdb_thrctx->pcb_rbp = regval; break; 125 case GDB_REG_RSP: kdb_thrctx->pcb_rsp = regval; break; 126 case GDB_REG_R12: kdb_thrctx->pcb_r12 = regval; break; 127 case GDB_REG_R13: kdb_thrctx->pcb_r13 = regval; break; 128 case GDB_REG_R14: kdb_thrctx->pcb_r14 = regval; break; 129 case GDB_REG_R15: kdb_thrctx->pcb_r15 = regval; break; 130 case GDB_REG_PC: kdb_thrctx->pcb_rip = regval; break; 131 } 132 } 133 134 int 135 gdb_cpu_signal(int type, int code) 136 { 137 138 switch (type & ~T_USER) { 139 case T_BPTFLT: return (SIGTRAP); 140 case T_ARITHTRAP: return (SIGFPE); 141 case T_PROTFLT: return (SIGSEGV); 142 case T_TRCTRAP: return (SIGTRAP); 143 case T_PAGEFLT: return (SIGSEGV); 144 case T_DIVIDE: return (SIGFPE); 145 case T_NMI: return (SIGTRAP); 146 case T_FPOPFLT: return (SIGILL); 147 case T_TSSFLT: return (SIGSEGV); 148 case T_SEGNPFLT: return (SIGSEGV); 149 case T_STKFLT: return (SIGSEGV); 150 case T_XMMFLT: return (SIGFPE); 151 } 152 return (SIGEMT); 153 } 154 155 void * 156 gdb_begin_write(void) 157 { 158 159 return (disable_wp() ? &gdb_begin_write : NULL); 160 } 161 162 void 163 gdb_end_write(void *arg) 164 { 165 166 restore_wp(arg != NULL); 167 } 168