/*-
* 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/signal.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/gdb_machdep.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/psl.h>
#include <machine/reg.h>
#include <machine/specialreg.h>
#include <machine/trap.h>
#include <machine/frame.h>
#include <machine/endian.h>
#include <gdb/gdb.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);
*regsz = gdb_cpu_regsz(regnum);
if (kdb_thread == curthread) {
switch (regnum) {
case 0: return (&kdb_frame->tf_rax);
case 2: return (&kdb_frame->tf_rcx);
case 3: return (&kdb_frame->tf_rdx);
case 4: return (&kdb_frame->tf_rsi);
case 5: return (&kdb_frame->tf_rdi);
case 8: return (&kdb_frame->tf_r8);
case 9: return (&kdb_frame->tf_r9);
case 10: return (&kdb_frame->tf_r10);
case 11: return (&kdb_frame->tf_r11);
case 17: return (&kdb_frame->tf_rflags);
case 18: return (&kdb_frame->tf_cs);
case 19: return (&kdb_frame->tf_ss);
}
}
switch (regnum) {
case 1: return (&kdb_thrctx->pcb_rbx);
case 6: return (&kdb_thrctx->pcb_rbp);
case 7: return (&kdb_thrctx->pcb_rsp);
case 12: return (&kdb_thrctx->pcb_r12);
case 13: return (&kdb_thrctx->pcb_r13);
case 14: return (&kdb_thrctx->pcb_r14);
case 15: return (&kdb_thrctx->pcb_r15);
case 16: return (&kdb_thrctx->pcb_rip);
case 18: return (&_kcodesel);
case 19: return (&_kdatasel);
}
return (NULL);
}
void
gdb_cpu_setreg(int regnum, void *val)
{
register_t regval = *(register_t *)val;
/*
* Write registers to the trapframe and pcb, if applicable.
* Some scratch registers are not tracked by the pcb.
*/
if (kdb_thread == curthread) {
switch (regnum) {
case GDB_REG_RAX: kdb_frame->tf_rax = regval; break;
case GDB_REG_RBX: kdb_frame->tf_rbx = regval; break;
case GDB_REG_RCX: kdb_frame->tf_rcx = regval; break;
case GDB_REG_RDX: kdb_frame->tf_rdx = regval; break;
case GDB_REG_RSI: kdb_frame->tf_rsi = regval; break;
case GDB_REG_RDI: kdb_frame->tf_rdi = regval; break;
case GDB_REG_RBP: kdb_frame->tf_rbp = regval; break;
case GDB_REG_RSP: kdb_frame->tf_rsp = regval; break;
case GDB_REG_R8: kdb_frame->tf_r8 = regval; break;
case GDB_REG_R9: kdb_frame->tf_r9 = regval; break;
case GDB_REG_R10: kdb_frame->tf_r10 = regval; break;
case GDB_REG_R11: kdb_frame->tf_r11 = regval; break;
case GDB_REG_R12: kdb_frame->tf_r12 = regval; break;
case GDB_REG_R13: kdb_frame->tf_r13 = regval; break;
case GDB_REG_R14: kdb_frame->tf_r14 = regval; break;
case GDB_REG_R15: kdb_frame->tf_r15 = regval; break;
case GDB_REG_PC: kdb_frame->tf_rip = regval; break;
}
}
switch (regnum) {
case GDB_REG_RBX: kdb_thrctx->pcb_rbx = regval; break;
case GDB_REG_RBP: kdb_thrctx->pcb_rbp = regval; break;
case GDB_REG_RSP: kdb_thrctx->pcb_rsp = regval; break;
case GDB_REG_R12: kdb_thrctx->pcb_r12 = regval; break;
case GDB_REG_R13: kdb_thrctx->pcb_r13 = regval; break;
case GDB_REG_R14: kdb_thrctx->pcb_r14 = regval; break;
case GDB_REG_R15: kdb_thrctx->pcb_r15 = regval; break;
case GDB_REG_PC: kdb_thrctx->pcb_rip = regval; break;
}
}
int
gdb_cpu_signal(int type, int code)
{
switch (type & ~T_USER) {
case 0: return (SIGFPE); /* Divide by zero. */
case 1: return (SIGTRAP); /* Debug exception. */
case 3: return (SIGTRAP); /* Breakpoint. */
case 4: return (SIGSEGV); /* into instr. (overflow). */
case 5: return (SIGURG); /* bound instruction. */
case 6: return (SIGILL); /* Invalid opcode. */
case 7: return (SIGFPE); /* Coprocessor not present. */
case 8: return (SIGEMT); /* Double fault. */
case 9: return (SIGSEGV); /* Coprocessor segment overrun. */
case 10: return (SIGTRAP); /* Invalid TSS (also single-step). */
case 11: return (SIGSEGV); /* Segment not present. */
case 12: return (SIGSEGV); /* Stack exception. */
case 13: return (SIGSEGV); /* General protection. */
case 14: return (SIGSEGV); /* Page fault. */
case 16: return (SIGEMT); /* Coprocessor error. */
}
return (SIGEMT);
}
void *
gdb_begin_write(void)
{
return (disable_wp() ? &gdb_begin_write : NULL);
}
void
gdb_end_write(void *arg)
{
restore_wp(arg != NULL);
}
