--- /dev/null
+/*
+ * 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 "exec/helper-proto.h"
+#include "sysemu/sysemu.h"
+
+void helper_raise_exception(CPUSPARCState *env, int tt)
+{
+ CPUState *cs = CPU(sparc_env_get_cpu(env));
+
+ cs->exception_index = tt;
+ cpu_loop_exit(cs);
+}
+
+void helper_debug(CPUSPARCState *env)
+{
+ CPUState *cs = CPU(sparc_env_get_cpu(env));
+
+ cs->exception_index = EXCP_DEBUG;
+ cpu_loop_exit(cs);
+}
+
+#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)
+{
+ SPARCCPU *cpu = sparc_env_get_cpu(env);
+ 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(CPU(cpu), GETPC());
+ helper_raise_exception(env, TT_DIV_ZERO);
+ }
+
+ x0 = x0 / x1;
+ if (x0 > UINT32_MAX) {
+ x0 = UINT32_MAX;
+ 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)
+{
+ SPARCCPU *cpu = sparc_env_get_cpu(env);
+ 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(CPU(cpu), GETPC());
+ helper_raise_exception(env, TT_DIV_ZERO);
+ } else if (x1 == -1 && x0 == INT64_MIN) {
+ x0 = INT32_MAX;
+ overflow = 1;
+ } else {
+ x0 = x0 / x1;
+ if ((int32_t) x0 != x0) {
+ x0 = x0 < 0 ? INT32_MIN : INT32_MAX;
+ 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. */
+ SPARCCPU *cpu = sparc_env_get_cpu(env);
+
+ cpu_restore_state(CPU(cpu), 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. */
+ SPARCCPU *cpu = sparc_env_get_cpu(env);
+
+ cpu_restore_state(CPU(cpu), GETPC());
+ helper_raise_exception(env, TT_DIV_ZERO);
+ }
+ return a / b;
+}
+#endif
+
+target_ulong helper_taddcctv(CPUSPARCState *env, target_ulong src1,
+ target_ulong src2)
+{
+ SPARCCPU *cpu = sparc_env_get_cpu(env);
+ 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(CPU(cpu), GETPC());
+ helper_raise_exception(env, TT_TOVF);
+}
+
+target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1,
+ target_ulong src2)
+{
+ SPARCCPU *cpu = sparc_env_get_cpu(env);
+ 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(CPU(cpu), 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;
+ cs->exception_index = EXCP_HLT;
+ env->pc = env->npc;
+ env->npc = env->pc + 4;
+ cpu_loop_exit(cs);
+}
+#endif
Code Review / kvmfornfv.git / blobdiff