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/*
* Sparc32 interrupt helpers
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "cpu.h"
#include "trace.h"
#include "exec/cpu_ldst.h"
#include "exec/log.h"
#include "sysemu/runstate.h"
static const char * const excp_names[0x80] = {
[TT_TFAULT] = "Instruction Access Fault",
[TT_ILL_INSN] = "Illegal Instruction",
[TT_PRIV_INSN] = "Privileged Instruction",
[TT_NFPU_INSN] = "FPU Disabled",
[TT_WIN_OVF] = "Window Overflow",
[TT_WIN_UNF] = "Window Underflow",
[TT_UNALIGNED] = "Unaligned Memory Access",
[TT_FP_EXCP] = "FPU Exception",
[TT_DFAULT] = "Data Access Fault",
[TT_TOVF] = "Tag Overflow",
[TT_EXTINT | 0x1] = "External Interrupt 1",
[TT_EXTINT | 0x2] = "External Interrupt 2",
[TT_EXTINT | 0x3] = "External Interrupt 3",
[TT_EXTINT | 0x4] = "External Interrupt 4",
[TT_EXTINT | 0x5] = "External Interrupt 5",
[TT_EXTINT | 0x6] = "External Interrupt 6",
[TT_EXTINT | 0x7] = "External Interrupt 7",
[TT_EXTINT | 0x8] = "External Interrupt 8",
[TT_EXTINT | 0x9] = "External Interrupt 9",
[TT_EXTINT | 0xa] = "External Interrupt 10",
[TT_EXTINT | 0xb] = "External Interrupt 11",
[TT_EXTINT | 0xc] = "External Interrupt 12",
[TT_EXTINT | 0xd] = "External Interrupt 13",
[TT_EXTINT | 0xe] = "External Interrupt 14",
[TT_EXTINT | 0xf] = "External Interrupt 15",
[TT_CODE_ACCESS] = "Instruction Access Error",
[TT_DATA_ACCESS] = "Data Access Error",
[TT_DIV_ZERO] = "Division By Zero",
[TT_NCP_INSN] = "Coprocessor Disabled",
};
static const char *excp_name_str(int32_t exception_index)
{
if (exception_index < 0 || exception_index >= ARRAY_SIZE(excp_names)) {
return "Unknown";
}
return excp_names[exception_index];
}
void cpu_check_irqs(CPUSPARCState *env)
{
CPUState *cs;
/* We should be holding the BQL before we mess with IRQs */
g_assert(bql_locked());
if (env->pil_in && (env->interrupt_index == 0 ||
(env->interrupt_index & ~15) == TT_EXTINT)) {
unsigned int i;
for (i = 15; i > 0; i--) {
if (env->pil_in & (1 << i)) {
int old_interrupt = env->interrupt_index;
env->interrupt_index = TT_EXTINT | i;
if (old_interrupt != env->interrupt_index) {
cs = env_cpu(env);
trace_sun4m_cpu_interrupt(i);
cpu_interrupt(cs, CPU_INTERRUPT_HARD);
}
break;
}
}
} else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
cs = env_cpu(env);
trace_sun4m_cpu_reset_interrupt(env->interrupt_index & 15);
env->interrupt_index = 0;
cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
}
}
void sparc_cpu_do_interrupt(CPUState *cs)
{
CPUSPARCState *env = cpu_env(cs);
int cwp, intno = cs->exception_index;
if (qemu_loglevel_mask(CPU_LOG_INT)) {
static int count;
const char *name;
if (intno < 0 || intno >= 0x100) {
name = "Unknown";
} else if (intno >= 0x80) {
name = "Trap Instruction";
} else {
name = excp_name_str(intno);
}
qemu_log("%6d: %s (v=%02x)\n", count, name, intno);
log_cpu_state(cs, 0);
count++;
}
#ifndef CONFIG_USER_ONLY
if (env->psret == 0) {
if (cs->exception_index == 0x80 &&
env->def.features & CPU_FEATURE_TA0_SHUTDOWN) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
} else {
cpu_abort(cs, "Trap 0x%02x (%s) while interrupts disabled, "
"Error state",
cs->exception_index, excp_name_str(cs->exception_index));
}
return;
}
if (intno == TT_FP_EXCP) {
/*
* The sparc32 fpu has three states related to exception handling.
* The FPop that signals an exception transitions from fp_execute
* to fp_exception_pending. A subsequent FPop transitions from
* fp_exception_pending to fp_exception, which forces the trap.
*
* If the queue is not empty, this trap is due to execution of an
* illegal FPop while in fp_exception state. Here we are to
* re-enter fp_exception_pending state without queuing the insn.
*
* We do not model the fp_exception_pending state, but instead
* skip directly to fp_exception state. We advance pc/npc to
* mimic delayed trap delivery as if by the subsequent insn.
*/
if (!env->fsr_qne) {
env->fsr_qne = FSR_QNE;
env->fq.s.addr = env->pc;
env->fq.s.insn = cpu_ldl_code(env, env->pc);
}
env->pc = env->npc;
env->npc = env->npc + 4;
}
#endif
env->psret = 0;
cwp = cpu_cwp_dec(env, env->cwp - 1);
cpu_set_cwp(env, cwp);
env->regwptr[9] = env->pc;
env->regwptr[10] = env->npc;
env->psrps = env->psrs;
env->psrs = 1;
env->tbr = (env->tbr & TBR_BASE_MASK) | (intno << 4);
env->pc = env->tbr;
env->npc = env->pc + 4;
cs->exception_index = -1;
#if !defined(CONFIG_USER_ONLY)
/* IRQ acknowledgment */
if ((intno & ~15) == TT_EXTINT && env->qemu_irq_ack != NULL) {
env->qemu_irq_ack(env, intno);
}
#endif
}
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