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("$FreeBSD$");
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
45 void *
46 gdb_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
83 void
84 gdb_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
95 int
96 gdb_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 }
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