1 /*-
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 /*
31 * Interface to new debugger.
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kdb.h>
37 #include <sys/pcpu.h>
38 #include <sys/proc.h>
39
40 #include <machine/psl.h>
41
42 #include <ddb/ddb.h>
43
44 /*
45 * Read bytes from kernel address space for debugger.
46 */
47 int
48 db_read_bytes(vm_offset_t addr, size_t size, char *data)
49 {
50 jmp_buf jb;
51 void *prev_jb;
52 char *src;
53 int ret;
54
55 prev_jb = kdb_jmpbuf(jb);
56 ret = setjmp(jb);
57 if (ret == 0) {
58 src = (char *)addr;
59 while (size-- > 0)
60 *data++ = *src++;
61 }
62 (void)kdb_jmpbuf(prev_jb);
63 return (ret);
64 }
65
66 /*
67 * Write bytes to kernel address space for debugger.
68 */
69 int
70 db_write_bytes(vm_offset_t addr, size_t size, char *data)
71 {
72 jmp_buf jb;
73 void *prev_jb;
74 char *dst;
75 int ret;
76
77 prev_jb = kdb_jmpbuf(jb);
78 ret = setjmp(jb);
79 if (ret == 0) {
80 dst = (char *)addr;
81 while (size-- > 0)
82 *dst++ = *data++;
83 }
84 (void)kdb_jmpbuf(prev_jb);
85 return (ret);
86 }
87
88 int
89 db_segsize(struct trapframe *tfp)
90 {
91 struct proc_ldt *plp;
92 struct segment_descriptor *sdp;
93 int sel;
94
95 if (tfp == NULL)
96 return (32);
97 if (tfp->tf_eflags & PSL_VM)
98 return (16);
99 sel = tfp->tf_cs & 0xffff;
100 if (sel == GSEL(GCODE_SEL, SEL_KPL))
101 return (32);
102 /* Rare cases follow. User mode cases are currently unreachable. */
103 if (ISLDT(sel)) {
104 plp = curthread->td_proc->p_md.md_ldt;
105 sdp = (plp != NULL) ? &plp->ldt_sd : &ldt[0].sd;
106 } else {
107 sdp = &gdt[PCPU_GET(cpuid) * NGDT].sd;
108 }
109 return (sdp[IDXSEL(sel)].sd_def32 == 0 ? 16 : 32);
110 }
111
112 void
113 db_show_mdpcpu(struct pcpu *pc)
114 {
115
116 db_printf("APIC ID = %d\n", pc->pc_apic_id);
117 db_printf("currentldt = 0x%x\n", pc->pc_currentldt);
118 db_printf("trampstk = 0x%x\n", pc->pc_trampstk);
119 db_printf("kesp0 = 0x%x\n", pc->pc_kesp0);
120 db_printf("common_tssp = 0x%x\n", (u_int)pc->pc_common_tssp);
121 db_printf("tlb gen = %u\n", pc->pc_smp_tlb_done);
122 }
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