2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004 Marcel Moolenaar
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/signal.h>
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>
54 gdb_cpu_getreg(int regnum, size_t *regsz)
56 static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
57 static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
59 *regsz = gdb_cpu_regsz(regnum);
61 if (kdb_thread == curthread) {
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);
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);
93 gdb_cpu_setreg(int regnum, void *val)
95 register_t regval = *(register_t *)val;
98 * Write registers to the trapframe and pcb, if applicable.
99 * Some scratch registers are not tracked by the pcb.
101 if (kdb_thread == curthread) {
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;
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;
135 gdb_cpu_signal(int type, int code)
138 switch (type & ~T_USER) {
139 case 0: return (SIGFPE); /* Divide by zero. */
140 case 1: return (SIGTRAP); /* Debug exception. */
141 case 3: return (SIGTRAP); /* Breakpoint. */
142 case 4: return (SIGSEGV); /* into instr. (overflow). */
143 case 5: return (SIGURG); /* bound instruction. */
144 case 6: return (SIGILL); /* Invalid opcode. */
145 case 7: return (SIGFPE); /* Coprocessor not present. */
146 case 8: return (SIGEMT); /* Double fault. */
147 case 9: return (SIGSEGV); /* Coprocessor segment overrun. */
148 case 10: return (SIGTRAP); /* Invalid TSS (also single-step). */
149 case 11: return (SIGSEGV); /* Segment not present. */
150 case 12: return (SIGSEGV); /* Stack exception. */
151 case 13: return (SIGSEGV); /* General protection. */
152 case 14: return (SIGSEGV); /* Page fault. */
153 case 16: return (SIGEMT); /* Coprocessor error. */
159 gdb_begin_write(void)
162 return (disable_wp() ? &gdb_begin_write : NULL);
166 gdb_end_write(void *arg)
169 restore_wp(arg != NULL);