gdb_machdep.c revision 331722 
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: stable/11/sys/amd64/amd64/gdb_machdep.c 331722 2018-03-29 02:50:57Z eadler $");
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/frame.h>
38#include <machine/gdb_machdep.h>
39#include <machine/pcb.h>
40#include <machine/psl.h>
41#include <machine/reg.h>
42#include <machine/trap.h>
43#include <machine/frame.h>
44#include <machine/endian.h>
45
46#include <gdb/gdb.h>
47
48void *
49gdb_cpu_getreg(int regnum, size_t *regsz)
50{
51	static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
52	static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
53
54	*regsz = gdb_cpu_regsz(regnum);
55
56	if (kdb_thread  == curthread) {
57		switch (regnum) {
58		case 0:	return (&kdb_frame->tf_rax);
59		case 2:	return (&kdb_frame->tf_rcx);
60		case 3:	return (&kdb_frame->tf_rdx);
61		case 4:	return (&kdb_frame->tf_rsi);
62		case 5:	return (&kdb_frame->tf_rdi);
63		case 8: return (&kdb_frame->tf_r8);
64		case 9: return (&kdb_frame->tf_r9);
65		case 10: return (&kdb_frame->tf_r10);
66		case 11: return (&kdb_frame->tf_r11);
67		case 17: return (&kdb_frame->tf_rflags);
68		case 18: return (&kdb_frame->tf_cs);
69		case 19: return (&kdb_frame->tf_ss);
70		}
71	}
72	switch (regnum) {
73	case 1:  return (&kdb_thrctx->pcb_rbx);
74	case 6:  return (&kdb_thrctx->pcb_rbp);
75	case 7:  return (&kdb_thrctx->pcb_rsp);
76	case 12: return (&kdb_thrctx->pcb_r12);
77	case 13: return (&kdb_thrctx->pcb_r13);
78	case 14: return (&kdb_thrctx->pcb_r14);
79	case 15: return (&kdb_thrctx->pcb_r15);
80	case 16: return (&kdb_thrctx->pcb_rip);
81	case 18: return (&_kcodesel);
82	case 19: return (&_kdatasel);
83	}
84	return (NULL);
85}
86
87void
88gdb_cpu_setreg(int regnum, void *val)
89{
90
91	switch (regnum) {
92	case GDB_REG_PC:
93		kdb_thrctx->pcb_rip = *(register_t *)val;
94		if (kdb_thread  == curthread)
95			kdb_frame->tf_rip = *(register_t *)val;
96	}
97}
98
99int
100gdb_cpu_signal(int type, int code)
101{
102
103	switch (type & ~T_USER) {
104	case 0: return (SIGFPE);	/* Divide by zero. */
105	case 1: return (SIGTRAP);	/* Debug exception. */
106	case 3: return (SIGTRAP);	/* Breakpoint. */
107	case 4: return (SIGSEGV);	/* into instr. (overflow). */
108	case 5: return (SIGURG);	/* bound instruction. */
109	case 6: return (SIGILL);	/* Invalid opcode. */
110	case 7: return (SIGFPE);	/* Coprocessor not present. */
111	case 8: return (SIGEMT);	/* Double fault. */
112	case 9: return (SIGSEGV);	/* Coprocessor segment overrun. */
113	case 10: return (SIGTRAP);	/* Invalid TSS (also single-step). */
114	case 11: return (SIGSEGV);	/* Segment not present. */
115	case 12: return (SIGSEGV);	/* Stack exception. */
116	case 13: return (SIGSEGV);	/* General protection. */
117	case 14: return (SIGSEGV);	/* Page fault. */
118	case 16: return (SIGEMT);	/* Coprocessor error. */
119	}
120	return (SIGEMT);
121}
122