qemu/target-sparc/helper.c
Andreas Färber 259186a7d2 cpu: Move halted and interrupt_request fields to CPUState
Both fields are used in VMState, thus need to be moved together.
Explicitly zero them on reset since they were located before
breakpoints.

Pass PowerPCCPU to kvmppc_handle_halt().

Signed-off-by: Andreas Färber <afaerber@suse.de>
2013-03-12 10:35:55 +01:00

241 lines
5.6 KiB
C

/*
* Misc Sparc 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 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 "cpu.h"
#include "qemu/host-utils.h"
#include "helper.h"
#include "sysemu/sysemu.h"
void helper_raise_exception(CPUSPARCState *env, int tt)
{
env->exception_index = tt;
cpu_loop_exit(env);
}
void helper_debug(CPUSPARCState *env)
{
env->exception_index = EXCP_DEBUG;
cpu_loop_exit(env);
}
#ifdef TARGET_SPARC64
target_ulong helper_popc(target_ulong val)
{
return ctpop64(val);
}
void helper_tick_set_count(void *opaque, uint64_t count)
{
#if !defined(CONFIG_USER_ONLY)
cpu_tick_set_count(opaque, count);
#endif
}
uint64_t helper_tick_get_count(void *opaque)
{
#if !defined(CONFIG_USER_ONLY)
return cpu_tick_get_count(opaque);
#else
return 0;
#endif
}
void helper_tick_set_limit(void *opaque, uint64_t limit)
{
#if !defined(CONFIG_USER_ONLY)
cpu_tick_set_limit(opaque, limit);
#endif
}
#endif
static target_ulong helper_udiv_common(CPUSPARCState *env, target_ulong a,
target_ulong b, int cc)
{
int overflow = 0;
uint64_t x0;
uint32_t x1;
x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
x1 = (b & 0xffffffff);
if (x1 == 0) {
cpu_restore_state(env, GETPC());
helper_raise_exception(env, TT_DIV_ZERO);
}
x0 = x0 / x1;
if (x0 > 0xffffffff) {
x0 = 0xffffffff;
overflow = 1;
}
if (cc) {
env->cc_dst = x0;
env->cc_src2 = overflow;
env->cc_op = CC_OP_DIV;
}
return x0;
}
target_ulong helper_udiv(CPUSPARCState *env, target_ulong a, target_ulong b)
{
return helper_udiv_common(env, a, b, 0);
}
target_ulong helper_udiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b)
{
return helper_udiv_common(env, a, b, 1);
}
static target_ulong helper_sdiv_common(CPUSPARCState *env, target_ulong a,
target_ulong b, int cc)
{
int overflow = 0;
int64_t x0;
int32_t x1;
x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
x1 = (b & 0xffffffff);
if (x1 == 0) {
cpu_restore_state(env, GETPC());
helper_raise_exception(env, TT_DIV_ZERO);
}
x0 = x0 / x1;
if ((int32_t) x0 != x0) {
x0 = x0 < 0 ? 0x80000000 : 0x7fffffff;
overflow = 1;
}
if (cc) {
env->cc_dst = x0;
env->cc_src2 = overflow;
env->cc_op = CC_OP_DIV;
}
return x0;
}
target_ulong helper_sdiv(CPUSPARCState *env, target_ulong a, target_ulong b)
{
return helper_sdiv_common(env, a, b, 0);
}
target_ulong helper_sdiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b)
{
return helper_sdiv_common(env, a, b, 1);
}
#ifdef TARGET_SPARC64
int64_t helper_sdivx(CPUSPARCState *env, int64_t a, int64_t b)
{
if (b == 0) {
/* Raise divide by zero trap. */
cpu_restore_state(env, GETPC());
helper_raise_exception(env, TT_DIV_ZERO);
} else if (b == -1) {
/* Avoid overflow trap with i386 divide insn. */
return -a;
} else {
return a / b;
}
}
uint64_t helper_udivx(CPUSPARCState *env, uint64_t a, uint64_t b)
{
if (b == 0) {
/* Raise divide by zero trap. */
cpu_restore_state(env, GETPC());
helper_raise_exception(env, TT_DIV_ZERO);
}
return a / b;
}
#endif
target_ulong helper_taddcctv(CPUSPARCState *env, target_ulong src1,
target_ulong src2)
{
target_ulong dst;
/* Tag overflow occurs if either input has bits 0 or 1 set. */
if ((src1 | src2) & 3) {
goto tag_overflow;
}
dst = src1 + src2;
/* Tag overflow occurs if the addition overflows. */
if (~(src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
goto tag_overflow;
}
/* Only modify the CC after any exceptions have been generated. */
env->cc_op = CC_OP_TADDTV;
env->cc_src = src1;
env->cc_src2 = src2;
env->cc_dst = dst;
return dst;
tag_overflow:
cpu_restore_state(env, GETPC());
helper_raise_exception(env, TT_TOVF);
}
target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1,
target_ulong src2)
{
target_ulong dst;
/* Tag overflow occurs if either input has bits 0 or 1 set. */
if ((src1 | src2) & 3) {
goto tag_overflow;
}
dst = src1 - src2;
/* Tag overflow occurs if the subtraction overflows. */
if ((src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
goto tag_overflow;
}
/* Only modify the CC after any exceptions have been generated. */
env->cc_op = CC_OP_TSUBTV;
env->cc_src = src1;
env->cc_src2 = src2;
env->cc_dst = dst;
return dst;
tag_overflow:
cpu_restore_state(env, GETPC());
helper_raise_exception(env, TT_TOVF);
}
#ifndef TARGET_SPARC64
void helper_power_down(CPUSPARCState *env)
{
CPUState *cs = CPU(sparc_env_get_cpu(env));
cs->halted = 1;
env->exception_index = EXCP_HLT;
env->pc = env->npc;
env->npc = env->pc + 4;
cpu_loop_exit(env);
}
#endif