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db_interface.c
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db_interface.c
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/* $OpenBSD: db_interface.c,v 1.37 2021/08/31 14:37:49 mlarkin Exp $ */
/* $NetBSD: db_interface.c,v 1.1 2003/04/26 18:39:27 fvdl Exp $ */
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
*/
/*
* Interface to new debugger.
*/
#include <sys/param.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <uvm/uvm_extern.h>
#include <dev/cons.h>
#include <machine/cpufunc.h>
#include <machine/db_machdep.h>
#include <machine/cpuvar.h>
#include <machine/i82093var.h>
#include <machine/atomic.h>
#include <machine/specialreg.h>
#include <ddb/db_sym.h>
#include <ddb/db_command.h>
#include <ddb/db_extern.h>
#include <ddb/db_output.h>
#include <ddb/db_run.h>
#include <ddb/db_var.h>
#include "acpi.h"
#if NACPI > 0
#include <dev/acpi/acpidebug.h>
#endif /* NACPI > 0 */
#include "wsdisplay.h"
#if NWSDISPLAY > 0
#include <dev/wscons/wsdisplayvar.h>
#endif
extern label_t *db_recover;
extern const char * const trap_type[];
extern const int trap_types;
#ifdef MULTIPROCESSOR
struct db_mutex ddb_mp_mutex = DB_MUTEX_INITIALIZER;
volatile int ddb_state = DDB_STATE_NOT_RUNNING;
volatile cpuid_t ddb_active_cpu;
int db_switch_cpu;
long db_switch_to_cpu;
#endif
db_regs_t ddb_regs;
void db_printtrap(int, int);
#ifdef MULTIPROCESSOR
void db_cpuinfo_cmd(db_expr_t, int, db_expr_t, char *);
void db_startproc_cmd(db_expr_t, int, db_expr_t, char *);
void db_stopproc_cmd(db_expr_t, int, db_expr_t, char *);
void db_ddbproc_cmd(db_expr_t, int, db_expr_t, char *);
#endif
/*
* Print trap reason.
*/
void
db_printtrap(int type, int code)
{
db_printf("kernel: ");
if (type >= trap_types || type < 0)
db_printf("type %d", type);
else
db_printf("%s", trap_type[type]);
db_printf(" trap, code=%x\n", code);
}
/*
* db_ktrap - field a TRACE or BPT trap
*/
int
db_ktrap(int type, int code, db_regs_t *regs)
{
int s;
#if NWSDISPLAY > 0
wsdisplay_enter_ddb();
#endif
switch (type) {
case T_BPTFLT: /* breakpoint */
case T_TRCTRAP: /* single_step */
case T_NMI: /* NMI */
case -1: /* keyboard interrupt */
break;
default:
if (!db_panic)
return (0);
db_printtrap(type, code);
if (db_recover != 0) {
db_error("Faulted in DDB; continuing...\n");
/*NOTREACHED*/
}
}
#ifdef MULTIPROCESSOR
db_mtx_enter(&ddb_mp_mutex);
if (ddb_state == DDB_STATE_EXITING)
ddb_state = DDB_STATE_NOT_RUNNING;
db_mtx_leave(&ddb_mp_mutex);
while (db_enter_ddb()) {
#endif
ddb_regs = *regs;
ddb_regs.tf_cs &= 0xffff;
ddb_regs.tf_ss &= 0xffff;
s = splhigh();
db_active++;
cnpollc(1);
db_trap(type, code);
cnpollc(0);
db_active--;
splx(s);
*regs = ddb_regs;
#ifdef MULTIPROCESSOR
if (!db_switch_cpu)
ddb_state = DDB_STATE_EXITING;
}
#endif
return (1);
}
void
db_sysregs_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
int64_t idtr, gdtr;
uint64_t cr;
uint16_t ldtr, tr;
uint64_t gsb;
__asm__ volatile("sidt %0" : "=m" (idtr));
db_printf("idtr: 0x%08llx/%04llx\n", idtr >> 16, idtr & 0xffff);
__asm__ volatile("sgdt %0" : "=m" (gdtr));
db_printf("gdtr: 0x%08llx/%04llx\n", gdtr >> 16, gdtr & 0xffff);
__asm__ volatile("sldt %0" : "=g" (ldtr));
db_printf("ldtr: 0x%04x\n", ldtr);
__asm__ volatile("str %0" : "=g" (tr));
db_printf("tr: 0x%04x\n", tr);
__asm__ volatile("movq %%cr0,%0" : "=r" (cr));
db_printf("cr0: 0x%016llx\n", cr);
__asm__ volatile("movq %%cr2,%0" : "=r" (cr));
db_printf("cr2: 0x%016llx\n", cr);
__asm__ volatile("movq %%cr3,%0" : "=r" (cr));
db_printf("cr3: 0x%016llx\n", cr);
__asm__ volatile("movq %%cr4,%0" : "=r" (cr));
db_printf("cr4: 0x%016llx\n", cr);
gsb = rdmsr(MSR_GSBASE);
db_printf("gsb: 0x%016llx\n", gsb);
gsb = rdmsr(MSR_KERNELGSBASE);
db_printf("kgsb: 0x%016llx\n", gsb);
}
#ifdef MULTIPROCESSOR
void
db_cpuinfo_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
int i;
for (i = 0; i < MAXCPUS; i++) {
if (cpu_info[i] != NULL) {
db_printf("%c%4d: ", (i == cpu_number()) ? '*' : ' ',
CPU_INFO_UNIT(cpu_info[i]));
switch(cpu_info[i]->ci_ddb_paused) {
case CI_DDB_RUNNING:
db_printf("running\n");
break;
case CI_DDB_SHOULDSTOP:
db_printf("stopping\n");
break;
case CI_DDB_STOPPED:
db_printf("stopped\n");
break;
case CI_DDB_ENTERDDB:
db_printf("entering ddb\n");
break;
case CI_DDB_INDDB:
db_printf("ddb\n");
break;
default:
db_printf("? (%d)\n",
cpu_info[i]->ci_ddb_paused);
break;
}
}
}
}
void
db_startproc_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
int i;
if (have_addr) {
if (addr >= 0 && addr < MAXCPUS &&
cpu_info[addr] != NULL && addr != cpu_number())
db_startcpu(addr);
else
db_printf("Invalid cpu %d\n", (int)addr);
} else {
for (i = 0; i < MAXCPUS; i++) {
if (cpu_info[i] != NULL && i != cpu_number())
db_startcpu(i);
}
}
}
void
db_stopproc_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
int i;
if (have_addr) {
if (addr >= 0 && addr < MAXCPUS &&
cpu_info[addr] != NULL && addr != cpu_number())
db_stopcpu(addr);
else
db_printf("Invalid cpu %d\n", (int)addr);
} else {
for (i = 0; i < MAXCPUS; i++) {
if (cpu_info[i] != NULL && i != cpu_number())
db_stopcpu(i);
}
}
}
void
db_ddbproc_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
if (have_addr) {
if (addr >= 0 && addr < MAXCPUS &&
cpu_info[addr] != NULL && addr != cpu_number()) {
db_stopcpu(addr);
db_switch_to_cpu = addr;
db_switch_cpu = 1;
db_cmd_loop_done = 1;
} else {
db_printf("Invalid cpu %d\n", (int)addr);
}
} else {
db_printf("CPU not specified\n");
}
}
int
db_enter_ddb(void)
{
int i;
db_mtx_enter(&ddb_mp_mutex);
/* If we are first in, grab ddb and stop all other CPUs */
if (ddb_state == DDB_STATE_NOT_RUNNING) {
ddb_active_cpu = cpu_number();
ddb_state = DDB_STATE_RUNNING;
curcpu()->ci_ddb_paused = CI_DDB_INDDB;
db_mtx_leave(&ddb_mp_mutex);
for (i = 0; i < MAXCPUS; i++) {
if (cpu_info[i] != NULL && i != cpu_number() &&
cpu_info[i]->ci_ddb_paused != CI_DDB_STOPPED) {
cpu_info[i]->ci_ddb_paused = CI_DDB_SHOULDSTOP;
x86_send_ipi(cpu_info[i], X86_IPI_DDB);
}
}
return (1);
}
/* Leaving ddb completely. Start all other CPUs and return 0 */
if (ddb_active_cpu == cpu_number() && ddb_state == DDB_STATE_EXITING) {
for (i = 0; i < MAXCPUS; i++) {
if (cpu_info[i] != NULL) {
cpu_info[i]->ci_ddb_paused = CI_DDB_RUNNING;
}
}
db_mtx_leave(&ddb_mp_mutex);
return (0);
}
/* We're switching to another CPU. db_ddbproc_cmd() has made sure
* it is waiting for ddb, we just have to set ddb_active_cpu. */
if (ddb_active_cpu == cpu_number() && db_switch_cpu) {
curcpu()->ci_ddb_paused = CI_DDB_SHOULDSTOP;
db_switch_cpu = 0;
ddb_active_cpu = db_switch_to_cpu;
cpu_info[db_switch_to_cpu]->ci_ddb_paused = CI_DDB_ENTERDDB;
}
/* Wait until we should enter ddb or resume */
while (ddb_active_cpu != cpu_number() &&
curcpu()->ci_ddb_paused != CI_DDB_RUNNING) {
if (curcpu()->ci_ddb_paused == CI_DDB_SHOULDSTOP)
curcpu()->ci_ddb_paused = CI_DDB_STOPPED;
db_mtx_leave(&ddb_mp_mutex);
/* Busy wait without locking, we'll confirm with lock later */
while (ddb_active_cpu != cpu_number() &&
curcpu()->ci_ddb_paused != CI_DDB_RUNNING)
CPU_BUSY_CYCLE();
db_mtx_enter(&ddb_mp_mutex);
}
/* Either enter ddb or exit */
if (ddb_active_cpu == cpu_number() && ddb_state == DDB_STATE_RUNNING) {
curcpu()->ci_ddb_paused = CI_DDB_INDDB;
db_mtx_leave(&ddb_mp_mutex);
return (1);
} else {
db_mtx_leave(&ddb_mp_mutex);
return (0);
}
}
void
db_startcpu(int cpu)
{
if (cpu != cpu_number() && cpu_info[cpu] != NULL) {
db_mtx_enter(&ddb_mp_mutex);
cpu_info[cpu]->ci_ddb_paused = CI_DDB_RUNNING;
db_mtx_leave(&ddb_mp_mutex);
}
}
void
db_stopcpu(int cpu)
{
db_mtx_enter(&ddb_mp_mutex);
if (cpu != cpu_number() && cpu_info[cpu] != NULL &&
cpu_info[cpu]->ci_ddb_paused != CI_DDB_STOPPED) {
cpu_info[cpu]->ci_ddb_paused = CI_DDB_SHOULDSTOP;
db_mtx_leave(&ddb_mp_mutex);
x86_send_ipi(cpu_info[cpu], X86_IPI_DDB);
} else {
db_mtx_leave(&ddb_mp_mutex);
}
}
void
x86_ipi_db(struct cpu_info *ci)
{
db_enter();
}
#endif /* MULTIPROCESSOR */
#if NACPI > 0
struct db_command db_acpi_cmds[] = {
{ "disasm", db_acpi_disasm, CS_OWN, NULL },
{ "showval", db_acpi_showval, CS_OWN, NULL },
{ "tree", db_acpi_tree, 0, NULL },
{ "trace", db_acpi_trace, 0, NULL },
{ NULL, NULL, 0, NULL }
};
#endif /* NACPI > 0 */
struct db_command db_machine_command_table[] = {
#ifdef MULTIPROCESSOR
{ "cpuinfo", db_cpuinfo_cmd, 0, 0 },
{ "startcpu", db_startproc_cmd, 0, 0 },
{ "stopcpu", db_stopproc_cmd, 0, 0 },
{ "ddbcpu", db_ddbproc_cmd, 0, 0 },
{ "sysregs", db_sysregs_cmd, 0, 0 },
#endif
#if NACPI > 0
{ "acpi", NULL, 0, db_acpi_cmds },
#endif /* NACPI > 0 */
{ NULL, },
};
void
db_machine_init(void)
{
#ifdef MULTIPROCESSOR
int i;
#endif
db_machine_commands_install(db_machine_command_table);
#ifdef MULTIPROCESSOR
for (i = 0; i < MAXCPUS; i++) {
if (cpu_info[i] != NULL)
cpu_info[i]->ci_ddb_paused = CI_DDB_RUNNING;
}
#endif
}
void
db_enter(void)
{
breakpoint();
}