diff options
Diffstat (limited to 'qemu/target-sparc/helper.c')
| -rw-r--r-- | qemu/target-sparc/helper.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/qemu/target-sparc/helper.c b/qemu/target-sparc/helper.c new file mode 100644 index 000000000..4850c7cec --- /dev/null +++ b/qemu/target-sparc/helper.c @@ -0,0 +1,255 @@ +/* + * 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 |