255 lines
6.0 KiB
C
255 lines
6.0 KiB
C
/*
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* Misc Sparc helpers
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "qemu/timer.h"
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#include "qemu/host-utils.h"
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#include "exec/helper-proto.h"
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void cpu_raise_exception_ra(CPUSPARCState *env, int tt, uintptr_t ra)
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{
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CPUState *cs = env_cpu(env);
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cs->exception_index = tt;
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cpu_loop_exit_restore(cs, ra);
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}
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void helper_raise_exception(CPUSPARCState *env, int tt)
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{
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CPUState *cs = env_cpu(env);
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cs->exception_index = tt;
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cpu_loop_exit(cs);
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}
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void helper_debug(CPUSPARCState *env)
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{
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CPUState *cs = env_cpu(env);
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cs->exception_index = EXCP_DEBUG;
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cpu_loop_exit(cs);
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}
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#ifdef TARGET_SPARC64
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void helper_tick_set_count(void *opaque, uint64_t count)
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{
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#if !defined(CONFIG_USER_ONLY)
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cpu_tick_set_count(opaque, count);
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#endif
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}
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uint64_t helper_tick_get_count(CPUSPARCState *env, void *opaque, int mem_idx)
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{
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#if !defined(CONFIG_USER_ONLY)
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CPUTimer *timer = opaque;
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if (timer->npt && mem_idx < MMU_KERNEL_IDX) {
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cpu_raise_exception_ra(env, TT_PRIV_INSN, GETPC());
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}
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return cpu_tick_get_count(timer);
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#else
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/* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist.
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Just pass through the host cpu clock ticks. */
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return cpu_get_host_ticks();
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#endif
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}
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void helper_tick_set_limit(void *opaque, uint64_t limit)
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{
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#if !defined(CONFIG_USER_ONLY)
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cpu_tick_set_limit(opaque, limit);
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#endif
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}
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#endif
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static target_ulong do_udiv(CPUSPARCState *env, target_ulong a,
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target_ulong b, int cc, uintptr_t ra)
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{
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int overflow = 0;
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uint64_t x0;
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uint32_t x1;
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x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
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x1 = (b & 0xffffffff);
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if (x1 == 0) {
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cpu_raise_exception_ra(env, TT_DIV_ZERO, ra);
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}
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x0 = x0 / x1;
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if (x0 > UINT32_MAX) {
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x0 = UINT32_MAX;
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overflow = 1;
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}
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if (cc) {
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env->cc_dst = x0;
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env->cc_src2 = overflow;
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env->cc_op = CC_OP_DIV;
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}
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return x0;
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}
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target_ulong helper_udiv(CPUSPARCState *env, target_ulong a, target_ulong b)
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{
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return do_udiv(env, a, b, 0, GETPC());
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}
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target_ulong helper_udiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b)
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{
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return do_udiv(env, a, b, 1, GETPC());
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}
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static target_ulong do_sdiv(CPUSPARCState *env, target_ulong a,
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target_ulong b, int cc, uintptr_t ra)
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{
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int overflow = 0;
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int64_t x0;
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int32_t x1;
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x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
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x1 = (b & 0xffffffff);
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if (x1 == 0) {
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cpu_raise_exception_ra(env, TT_DIV_ZERO, ra);
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} else if (x1 == -1 && x0 == INT64_MIN) {
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x0 = INT32_MAX;
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overflow = 1;
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} else {
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x0 = x0 / x1;
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if ((int32_t) x0 != x0) {
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x0 = x0 < 0 ? INT32_MIN : INT32_MAX;
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overflow = 1;
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}
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}
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if (cc) {
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env->cc_dst = x0;
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env->cc_src2 = overflow;
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env->cc_op = CC_OP_DIV;
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}
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return x0;
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}
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target_ulong helper_sdiv(CPUSPARCState *env, target_ulong a, target_ulong b)
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{
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return do_sdiv(env, a, b, 0, GETPC());
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}
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target_ulong helper_sdiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b)
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{
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return do_sdiv(env, a, b, 1, GETPC());
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}
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#ifdef TARGET_SPARC64
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int64_t helper_sdivx(CPUSPARCState *env, int64_t a, int64_t b)
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{
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if (b == 0) {
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/* Raise divide by zero trap. */
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cpu_raise_exception_ra(env, TT_DIV_ZERO, GETPC());
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} else if (b == -1) {
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/* Avoid overflow trap with i386 divide insn. */
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return -a;
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} else {
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return a / b;
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}
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}
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uint64_t helper_udivx(CPUSPARCState *env, uint64_t a, uint64_t b)
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{
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if (b == 0) {
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/* Raise divide by zero trap. */
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cpu_raise_exception_ra(env, TT_DIV_ZERO, GETPC());
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}
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return a / b;
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}
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#endif
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target_ulong helper_taddcctv(CPUSPARCState *env, target_ulong src1,
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target_ulong src2)
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{
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target_ulong dst;
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/* Tag overflow occurs if either input has bits 0 or 1 set. */
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if ((src1 | src2) & 3) {
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goto tag_overflow;
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}
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dst = src1 + src2;
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/* Tag overflow occurs if the addition overflows. */
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if (~(src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
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goto tag_overflow;
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}
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/* Only modify the CC after any exceptions have been generated. */
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env->cc_op = CC_OP_TADDTV;
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env->cc_src = src1;
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env->cc_src2 = src2;
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env->cc_dst = dst;
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return dst;
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tag_overflow:
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cpu_raise_exception_ra(env, TT_TOVF, GETPC());
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}
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target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1,
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target_ulong src2)
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{
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target_ulong dst;
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/* Tag overflow occurs if either input has bits 0 or 1 set. */
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if ((src1 | src2) & 3) {
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goto tag_overflow;
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}
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dst = src1 - src2;
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/* Tag overflow occurs if the subtraction overflows. */
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if ((src1 ^ src2) & (src1 ^ dst) & (1u << 31)) {
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goto tag_overflow;
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}
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/* Only modify the CC after any exceptions have been generated. */
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env->cc_op = CC_OP_TSUBTV;
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env->cc_src = src1;
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env->cc_src2 = src2;
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env->cc_dst = dst;
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return dst;
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tag_overflow:
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cpu_raise_exception_ra(env, TT_TOVF, GETPC());
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}
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#ifndef TARGET_SPARC64
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void helper_power_down(CPUSPARCState *env)
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{
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CPUState *cs = env_cpu(env);
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cs->halted = 1;
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cs->exception_index = EXCP_HLT;
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env->pc = env->npc;
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env->npc = env->pc + 4;
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cpu_loop_exit(cs);
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}
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#endif
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