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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2004 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/reg.h>
#include <sys/signal.h>
#include <machine/endian.h>
#include <machine/frame.h>
#include <machine/gdb_machdep.h>
#include <machine/pcb.h>
#include <machine/trap.h>
#include <gdb/gdb.h>
#include <gdb/gdb_int.h>
void *
gdb_cpu_getreg(int regnum, size_t *regsz)
{
static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
static uint32_t _kprivsel = GSEL(GPRIV_SEL, SEL_KPL);
*regsz = gdb_cpu_regsz(regnum);
if (kdb_thread == curthread) {
switch (regnum) {
case 0: return (&kdb_frame->tf_eax);
case 1: return (&kdb_frame->tf_ecx);
case 2: return (&kdb_frame->tf_edx);
case 9: return (&kdb_frame->tf_eflags);
case 10: return (&kdb_frame->tf_cs);
case 12: return (&kdb_frame->tf_ds);
case 13: return (&kdb_frame->tf_es);
case 14: return (&kdb_frame->tf_fs);
}
}
switch (regnum) {
case 3: return (&kdb_thrctx->pcb_ebx);
case 4: return (&kdb_thrctx->pcb_esp);
case 5: return (&kdb_thrctx->pcb_ebp);
case 6: return (&kdb_thrctx->pcb_esi);
case 7: return (&kdb_thrctx->pcb_edi);
case 8: return (&kdb_thrctx->pcb_eip);
case 10: return (&_kcodesel);
case 11: return (&_kdatasel);
case 12: return (&_kdatasel);
case 13: return (&_kdatasel);
case 14: return (&_kprivsel);
case 15: return (&kdb_thrctx->pcb_gs);
}
return (NULL);
}
void
gdb_cpu_setreg(int regnum, void *val)
{
switch (regnum) {
case GDB_REG_PC:
kdb_thrctx->pcb_eip = *(register_t *)val;
if (kdb_thread == curthread)
kdb_frame->tf_eip = *(register_t *)val;
}
}
int
gdb_cpu_signal(int type, int code)
{
switch (type & ~T_USER) {
case T_BPTFLT: return (SIGTRAP);
case T_ARITHTRAP: return (SIGFPE);
case T_PROTFLT: return (SIGSEGV);
case T_TRCTRAP: return (SIGTRAP);
case T_PAGEFLT: return (SIGSEGV);
case T_DIVIDE: return (SIGFPE);
case T_NMI: return (SIGTRAP);
case T_FPOPFLT: return (SIGILL);
case T_TSSFLT: return (SIGSEGV);
case T_SEGNPFLT: return (SIGSEGV);
case T_STKFLT: return (SIGSEGV);
case T_XMMFLT: return (SIGFPE);
}
return (SIGEMT);
}
void
gdb_cpu_stop_reason(int type, int code)
{
uintmax_t val;
val = 0;
if (type == T_TRCTRAP) {
/* NB: 'code' contains the value of dr6 at the trap. */
if ((code & DBREG_DR6_B(0)) != 0) {
val = rdr0();
}
if ((code & DBREG_DR6_B(1)) != 0) {
val = rdr1();
}
if ((code & DBREG_DR6_B(2)) != 0) {
val = rdr2();
}
if ((code & DBREG_DR6_B(3)) != 0) {
val = rdr3();
}
/*
* TODO: validate the bits in DR7 to differentiate between a
* watchpoint trap and a hardware breakpoint trap (currently
* unsupported).
*/
if (val != 0) {
gdb_tx_str("watch:");
gdb_tx_varhex(val);
gdb_tx_char(';');
}
}
}
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