gdb_machdep.c revision 330897 
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: stable/11/sys/amd64/amd64/gdb_machdep.c 330897 2018-03-14 03:19:51Z eadler $");
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
50void *
51gdb_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
89void
90gdb_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
101int
102gdb_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