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74ab5e8006
NetBSD/gnu/dist/sim/ppc/interrupts.c
thorpej 74ab5e8006 Import the simulator sources from the gdb-4.16 distribution which were 
omitted when our GDB was updated.
1998-02-01 07:56:37 +00:00

419 lines
9.8 KiB
C
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/* This file is part of the program psim.
Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _INTERRUPTS_C_
#define _INTERRUPTS_C_
#include <signal.h>
#include "cpu.h"
#include "idecode.h"
#include "os_emul.h"
/* Operating environment support code
Unlike the VEA, the OEA must fully model the effect an interrupt
has on the processors state.
Each function below return updated values for registers effected by
interrupts */
STATIC_INLINE_INTERRUPTS\
(msreg)
interrupt_msr(msreg old_msr,
msreg msr_clear,
msreg msr_set)
{
msreg msr_set_to_0 = (msr_branch_trace_enable
| msr_data_relocate
| msr_external_interrupt_enable
| msr_floating_point_exception_mode_0
| msr_floating_point_exception_mode_1
| msr_floating_point_available
| msr_instruction_relocate
| msr_power_management_enable
| msr_problem_state
| msr_recoverable_interrupt
| msr_single_step_trace_enable);
/* remember, in 32bit mode msr_64bit_mode is zero */
msreg new_msr = ((((old_msr & ~msr_set_to_0)
| msr_64bit_mode)
& ~msr_clear)
| msr_set);
return new_msr;
}
STATIC_INLINE_INTERRUPTS\
(msreg)
interrupt_srr1(msreg old_msr,
msreg srr1_clear,
msreg srr1_set)
{
spreg srr1_mask = (MASK(0,32)
| MASK(37, 41)
| MASK(48, 63));
spreg srr1 = (old_msr & srr1_mask & ~srr1_clear) | srr1_set;
return srr1;
}
STATIC_INLINE_INTERRUPTS\
(unsigned_word)
interrupt_base_ea(msreg msr)
{
if (msr & msr_interrupt_prefix)
return MASK(0, 43);
else
return 0;
}
/* finish off an interrupt for the OEA model, updating all registers
and forcing a restart of the processor */
STATIC_INLINE_INTERRUPTS\
(unsigned_word)
perform_oea_interrupt(cpu *processor,
unsigned_word cia,
unsigned_word vector_offset,
msreg msr_clear,
msreg msr_set,
msreg srr1_clear,
msreg srr1_set)
{
msreg old_msr = MSR;
msreg new_msr = interrupt_msr(old_msr, msr_clear, msr_set);
unsigned_word nia;
if (!(old_msr & msr_recoverable_interrupt))
error("perform_oea_interrupt() recoverable_interrupt bit clear, cia=0x%x, msr=0x%x\n",
cia, old_msr);
SRR0 = (spreg)(cia);
SRR1 = interrupt_srr1(old_msr, srr1_clear, srr1_set);
MSR = new_msr;
nia = interrupt_base_ea(new_msr) + vector_offset;
cpu_synchronize_context(processor);
return nia;
}
INLINE_INTERRUPTS\
(void)
machine_check_interrupt(cpu *processor,
unsigned_word cia)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
error("%s - cia=0x%x\n",
"machine_check_interrupt", cia);
case OPERATING_ENVIRONMENT:
cia = perform_oea_interrupt(processor, cia, 0x00200, 0, 0, 0, 0);
cpu_restart(processor, cia);
default:
error("machine_check_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
data_storage_interrupt(cpu *processor,
unsigned_word cia,
unsigned_word ea,
storage_interrupt_reasons reason,
int is_store)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
error("data_storage_interrupt() should not be called in VEA mode\n");
case OPERATING_ENVIRONMENT:
{
spreg direction = (is_store ? dsisr_store_operation : 0);
switch (reason) {
case direct_store_storage_interrupt:
DSISR = dsisr_direct_store_error_exception | direction;
break;
case hash_table_miss_storage_interrupt:
DSISR = dsisr_hash_table_or_dbat_miss | direction;
break;
case protection_violation_storage_interrupt:
DSISR = dsisr_protection_violation | direction;
break;
case earwax_violation_storage_interrupt:
DSISR = dsisr_earwax_violation | direction;
break;
case segment_table_miss_storage_interrupt:
DSISR = dsisr_segment_table_miss | direction;
break;
case earwax_disabled_storage_interrupt:
DSISR = dsisr_earwax_disabled | direction;
break;
default:
error("data_storage_interrupt: unknown reason %d\n", reason);
break;
}
DAR = (spreg)ea;
cia = perform_oea_interrupt(processor, cia, 0x00300, 0, 0, 0, 0);
cpu_restart(processor, cia);
}
default:
error("data_storage_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
instruction_storage_interrupt(cpu *processor,
unsigned_word cia,
storage_interrupt_reasons reason)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
error("instruction_storage_interrupt - cia=0x%x - not implemented\n",
cia);
case OPERATING_ENVIRONMENT:
{
msreg srr1_set;
switch(reason) {
case hash_table_miss_storage_interrupt:
srr1_set = srr1_hash_table_or_ibat_miss;
break;
case direct_store_storage_interrupt:
srr1_set = srr1_direct_store_error_exception;
break;
case protection_violation_storage_interrupt:
srr1_set = srr1_protection_violation;
break;
case segment_table_miss_storage_interrupt:
srr1_set = srr1_segment_table_miss;
break;
default:
srr1_set = 0;
error("instruction_storage_interrupt: unknown reason %d\n", reason);
break;
}
cia = perform_oea_interrupt(processor, cia, 0x00400, 0, 0, 0, srr1_set);
cpu_restart(processor, cia);
}
default:
error("instruction_storage_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
alignment_interrupt(cpu *processor,
unsigned_word cia,
unsigned_word ra)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
error("%s - cia=0x%x, ra=0x%x\n",
"alignment_interrupt", cia, ra);
case OPERATING_ENVIRONMENT:
DAR = (spreg)ra;
DSISR = 0; /* FIXME */
cia = perform_oea_interrupt(processor, cia, 0x00600, 0, 0, 0, 0);
cpu_restart(processor, cia);
default:
error("alignment_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
program_interrupt(cpu *processor,
unsigned_word cia,
program_interrupt_reasons reason)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
switch (reason) {
default:
error("%s - cia=0x%x, reason=%d - not implemented\n",
"program_interrupt", cia, reason);
}
case OPERATING_ENVIRONMENT:
{
msreg srr1_set;
switch (reason) {
case illegal_instruction_program_interrupt:
srr1_set = srr1_illegal_instruction;
break;
case privileged_instruction_program_interrupt:
srr1_set = srr1_priviliged_instruction;
break;
case trap_program_interrupt:
srr1_set = srr1_trap;
break;
default:
srr1_set = 0;
error("program_interrupt - cia=0x%x, reason=%d(%s) - not implemented\n",
cia, reason);
}
cia = perform_oea_interrupt(processor, cia, 0x00700, 0, 0, 0, srr1_set);
cpu_restart(processor, cia);
}
default:
error("program_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
floating_point_unavailable_interrupt(cpu *processor,
unsigned_word cia)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
error("%s - cia=0x%x - not implemented\n",
"floating_point_unavailable_interrupt", cia);
case OPERATING_ENVIRONMENT:
cia = perform_oea_interrupt(processor, cia, 0x00800, 0, 0, 0, 0);
cpu_restart(processor, cia);
default:
error("floating_point_unavailable_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
system_call_interrupt(cpu *processor,
unsigned_word cia)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
os_emul_system_call(processor, cia);
cpu_restart(processor, cia+4);
case OPERATING_ENVIRONMENT:
cia = perform_oea_interrupt(processor, cia+4, 0x00c00, 0, 0, 0, 0);
cpu_restart(processor, cia);
default:
error("system_call_interrupt() - internal error\n");
}
}
INLINE_INTERRUPTS\
(void)
floating_point_assist_interrupt(cpu *processor,
unsigned_word cia)
{
switch (CURRENT_ENVIRONMENT) {
case USER_ENVIRONMENT:
case VIRTUAL_ENVIRONMENT:
error("%s - cia=0x%x - not implemented\n",
"floating_point_assist_interrupt", cia);
case OPERATING_ENVIRONMENT:
cia = perform_oea_interrupt(processor, cia, 0x00e00, 0, 0, 0, 0);
cpu_restart(processor, cia);
default:
error("floating_point_assist_interrupt() - internal error\n");
}
}
/* handle an externally generated event */
INLINE_INTERRUPTS\
(int)
decrementer_interrupt(cpu *processor)
{
if (cpu_registers(processor)->msr & msr_external_interrupt_enable) {
unsigned_word cia = cpu_get_program_counter(processor);
unsigned_word nia = perform_oea_interrupt(processor,
cia, 0x00900, 0, 0, 0, 0);
cpu_set_program_counter(processor, nia);
return 1;
}
else {
return 0;
}
}
INLINE_INTERRUPTS\
(int)
external_interrupt(cpu *processor)
{
if (cpu_registers(processor)->msr & msr_external_interrupt_enable) {
unsigned_word cia = cpu_get_program_counter(processor);
unsigned_word nia = perform_oea_interrupt(processor,
cia, 0x00500, 0, 0, 0, 0);
cpu_set_program_counter(processor, nia);
return 1;
}
else {
return 0; /* not delivered */
}
}
#endif /* _INTERRUPTS_C_ */
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