1/*-
2 * Copyright (c) 2004 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: releng/10.3/sys/i386/i386/gdb_machdep.c 290734 2015-11-13 00:50:34Z jhb $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kdb.h>
33#include <sys/kernel.h>
34#include <sys/proc.h>
35#include <sys/signal.h>
36
37#include <machine/gdb_machdep.h>
38#include <machine/pcb.h>
39#include <machine/trap.h>
40#include <machine/frame.h>
41#include <machine/endian.h>
42
43#include <gdb/gdb.h>
44
45void *
46gdb_cpu_getreg(int regnum, size_t *regsz)
47{
48	static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
49	static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
50	static uint32_t _kprivsel = GSEL(GPRIV_SEL, SEL_KPL);
51
52	*regsz = gdb_cpu_regsz(regnum);
53
54	if (kdb_thread == curthread) {
55		switch (regnum) {
56		case 0:	return (&kdb_frame->tf_eax);
57		case 1:	return (&kdb_frame->tf_ecx);
58		case 2:	return (&kdb_frame->tf_edx);
59		case 9: return (&kdb_frame->tf_eflags);
60		case 10: return (&kdb_frame->tf_cs);
61		case 12: return (&kdb_frame->tf_ds);
62		case 13: return (&kdb_frame->tf_es);
63		case 14: return (&kdb_frame->tf_fs);
64		}
65	}
66	switch (regnum) {
67	case 3:  return (&kdb_thrctx->pcb_ebx);
68	case 4:  return (&kdb_thrctx->pcb_esp);
69	case 5:  return (&kdb_thrctx->pcb_ebp);
70	case 6:  return (&kdb_thrctx->pcb_esi);
71	case 7:  return (&kdb_thrctx->pcb_edi);
72	case 8:  return (&kdb_thrctx->pcb_eip);
73	case 10: return (&_kcodesel);
74	case 11: return (&_kdatasel);
75	case 12: return (&_kdatasel);
76	case 13: return (&_kdatasel);
77	case 14: return (&_kprivsel);
78	case 15: return (&kdb_thrctx->pcb_gs);
79	}
80	return (NULL);
81}
82
83void
84gdb_cpu_setreg(int regnum, void *val)
85{
86
87	switch (regnum) {
88	case GDB_REG_PC:
89		kdb_thrctx->pcb_eip = *(register_t *)val;
90		if (kdb_thread  == curthread)
91			kdb_frame->tf_eip = *(register_t *)val;
92	}
93}
94
95int
96gdb_cpu_signal(int type, int code)
97{
98
99	switch (type & ~T_USER) {
100	case 0: return (SIGFPE);	/* Divide by zero. */
101	case 1: return (SIGTRAP);	/* Debug exception. */
102	case 3: return (SIGTRAP);	/* Breakpoint. */
103	case 4: return (SIGURG);	/* into instr. (overflow). */
104	case 5: return (SIGURG);	/* bound instruction. */
105	case 6: return (SIGILL);	/* Invalid opcode. */
106	case 7: return (SIGFPE);	/* Coprocessor not present. */
107	case 8: return (SIGEMT);	/* Double fault. */
108	case 9: return (SIGSEGV);	/* Coprocessor segment overrun. */
109	case 10: return (SIGTRAP);	/* Invalid TSS (also single-step). */
110	case 11: return (SIGSEGV);	/* Segment not present. */
111	case 12: return (SIGSEGV);	/* Stack exception. */
112	case 13: return (SIGSEGV);	/* General protection. */
113	case 14: return (SIGSEGV);	/* Page fault. */
114	case 16: return (SIGEMT);	/* Coprocessor error. */
115	}
116	return (SIGEMT);
117}
118