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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright 2018 Joyent, Inc.
*/
/*
* Kernel/Debugger Interface (KDI) routines. Called during debugger under
* various system states (boot, while running, while the debugger has control).
* Functions intended for use while the debugger has control may not grab any
* locks or perform any functions that assume the availability of other system
* services.
*/
#include <sys/systm.h>
#include <sys/x86_archext.h>
#include <sys/kdi_impl.h>
#include <sys/smp_impldefs.h>
#include <sys/psm_types.h>
#include <sys/segments.h>
#include <sys/archsystm.h>
#include <sys/controlregs.h>
#include <sys/trap.h>
#include <sys/kobj.h>
#include <sys/kobj_impl.h>
#include <sys/mach_mmu.h>
void
kdi_idt_write(gate_desc_t *gate, uint_t vec)
{
gate_desc_t *idt = CPU->cpu_m.mcpu_idt;
/*
* See kdi_idtr_set().
*/
if (idt == NULL) {
desctbr_t idtr;
rd_idtr(&idtr);
idt = (gate_desc_t *)idtr.dtr_base;
}
idt[vec] = *gate;
}
ulong_t
kdi_dreg_get(int reg)
{
switch (reg) {
case 0:
return (kdi_getdr0());
case 1:
return (kdi_getdr1());
case 2:
return (kdi_getdr2());
case 3:
return (kdi_getdr3());
case 6:
return (kdi_getdr6());
case 7:
return (kdi_getdr7());
default:
panic("invalid debug register dr%d", reg);
/*NOTREACHED*/
}
}
void
kdi_dreg_set(int reg, ulong_t value)
{
switch (reg) {
case 0:
kdi_setdr0(value);
break;
case 1:
kdi_setdr1(value);
break;
case 2:
kdi_setdr2(value);
break;
case 3:
kdi_setdr3(value);
break;
case 6:
kdi_setdr6(value);
break;
case 7:
kdi_setdr7(value);
break;
default:
panic("invalid debug register dr%d", reg);
/*NOTREACHED*/
}
}
extern void kdi_slave_entry(void);
void
kdi_stop_slaves(int cpu, int doxc)
{
if (doxc)
kdi_xc_others(cpu, kdi_slave_entry);
}
/*
* On i86pc, slaves busy-loop, so we don't need to do anything here.
*/
void
kdi_start_slaves(void)
{
}
void
kdi_slave_wait(void)
{
}
/*
* Caution.
* These routines are called -extremely- early, during kmdb initialization.
*
* Many common kernel functions assume that %gs has been initialized,
* and fail horribly if it hasn't. At this point, the boot code has
* reserved a descriptor for us (KMDBGS_SEL) in it's GDT; arrange for it
* to point at a dummy cpu_t, temporarily at least.
*
* Note that kmdb entry relies on the fake cpu_t having zero cpu_idt/cpu_id.
*/
#if defined(__amd64)
void *
boot_kdi_tmpinit(void)
{
cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP);
uintptr_t old;
cpu->cpu_self = cpu;
old = (uintptr_t)rdmsr(MSR_AMD_GSBASE);
wrmsr(MSR_AMD_GSBASE, (uint64_t)cpu);
return ((void *)old);
}
void
boot_kdi_tmpfini(void *old)
{
wrmsr(MSR_AMD_GSBASE, (uint64_t)old);
}
#elif defined(__i386)
void *
boot_kdi_tmpinit(void)
{
cpu_t *cpu = kobj_zalloc(sizeof (*cpu), KM_TMP);
uintptr_t old;
desctbr_t b_gdtr;
user_desc_t *bgdt;
cpu->cpu_self = cpu;
rd_gdtr(&b_gdtr);
bgdt = (user_desc_t *)(b_gdtr.dtr_base);
set_usegd(&bgdt[GDT_BGSTMP],
cpu, sizeof (*cpu), SDT_MEMRWA, SEL_KPL, SDP_BYTES, SDP_OP32);
/*
* Now switch %gs to point at it.
*/
old = getgs();
setgs(KMDBGS_SEL);
return ((void *)old);
}
void
boot_kdi_tmpfini(void *old)
{
setgs((uintptr_t)old);
}
#endif /* __i386 */
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