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 */
47int
48db_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 */
69int
70db_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
88int
89db_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
112void
113db_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}
123