1 | /* |
2 | * Misc Sparc helpers |
3 | * |
4 | * Copyright (c) 2003-2005 Fabrice Bellard |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2 of the License, or (at your option) any later version. |
10 | * |
11 | * This library is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
18 | */ |
19 | |
20 | #include "qemu/osdep.h" |
21 | #include "cpu.h" |
22 | #include "exec/exec-all.h" |
23 | #include "qemu/host-utils.h" |
24 | #include "exec/helper-proto.h" |
25 | |
26 | void cpu_raise_exception_ra(CPUSPARCState *env, int tt, uintptr_t ra) |
27 | { |
28 | CPUState *cs = env_cpu(env); |
29 | |
30 | cs->exception_index = tt; |
31 | cpu_loop_exit_restore(cs, ra); |
32 | } |
33 | |
34 | void helper_raise_exception(CPUSPARCState *env, int tt) |
35 | { |
36 | CPUState *cs = env_cpu(env); |
37 | |
38 | cs->exception_index = tt; |
39 | cpu_loop_exit(cs); |
40 | } |
41 | |
42 | void helper_debug(CPUSPARCState *env) |
43 | { |
44 | CPUState *cs = env_cpu(env); |
45 | |
46 | cs->exception_index = EXCP_DEBUG; |
47 | cpu_loop_exit(cs); |
48 | } |
49 | |
50 | #ifdef TARGET_SPARC64 |
51 | void helper_tick_set_count(void *opaque, uint64_t count) |
52 | { |
53 | #if !defined(CONFIG_USER_ONLY) |
54 | cpu_tick_set_count(opaque, count); |
55 | #endif |
56 | } |
57 | |
58 | uint64_t helper_tick_get_count(CPUSPARCState *env, void *opaque, int mem_idx) |
59 | { |
60 | #if !defined(CONFIG_USER_ONLY) |
61 | CPUTimer *timer = opaque; |
62 | |
63 | if (timer->npt && mem_idx < MMU_KERNEL_IDX) { |
64 | cpu_raise_exception_ra(env, TT_PRIV_INSN, GETPC()); |
65 | } |
66 | |
67 | return cpu_tick_get_count(timer); |
68 | #else |
69 | /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. |
70 | Just pass through the host cpu clock ticks. */ |
71 | return cpu_get_host_ticks(); |
72 | #endif |
73 | } |
74 | |
75 | void helper_tick_set_limit(void *opaque, uint64_t limit) |
76 | { |
77 | #if !defined(CONFIG_USER_ONLY) |
78 | cpu_tick_set_limit(opaque, limit); |
79 | #endif |
80 | } |
81 | #endif |
82 | |
83 | static target_ulong do_udiv(CPUSPARCState *env, target_ulong a, |
84 | target_ulong b, int cc, uintptr_t ra) |
85 | { |
86 | int overflow = 0; |
87 | uint64_t x0; |
88 | uint32_t x1; |
89 | |
90 | x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32); |
91 | x1 = (b & 0xffffffff); |
92 | |
93 | if (x1 == 0) { |
94 | cpu_raise_exception_ra(env, TT_DIV_ZERO, ra); |
95 | } |
96 | |
97 | x0 = x0 / x1; |
98 | if (x0 > UINT32_MAX) { |
99 | x0 = UINT32_MAX; |
100 | overflow = 1; |
101 | } |
102 | |
103 | if (cc) { |
104 | env->cc_dst = x0; |
105 | env->cc_src2 = overflow; |
106 | env->cc_op = CC_OP_DIV; |
107 | } |
108 | return x0; |
109 | } |
110 | |
111 | target_ulong helper_udiv(CPUSPARCState *env, target_ulong a, target_ulong b) |
112 | { |
113 | return do_udiv(env, a, b, 0, GETPC()); |
114 | } |
115 | |
116 | target_ulong helper_udiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b) |
117 | { |
118 | return do_udiv(env, a, b, 1, GETPC()); |
119 | } |
120 | |
121 | static target_ulong do_sdiv(CPUSPARCState *env, target_ulong a, |
122 | target_ulong b, int cc, uintptr_t ra) |
123 | { |
124 | int overflow = 0; |
125 | int64_t x0; |
126 | int32_t x1; |
127 | |
128 | x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32); |
129 | x1 = (b & 0xffffffff); |
130 | |
131 | if (x1 == 0) { |
132 | cpu_raise_exception_ra(env, TT_DIV_ZERO, ra); |
133 | } else if (x1 == -1 && x0 == INT64_MIN) { |
134 | x0 = INT32_MAX; |
135 | overflow = 1; |
136 | } else { |
137 | x0 = x0 / x1; |
138 | if ((int32_t) x0 != x0) { |
139 | x0 = x0 < 0 ? INT32_MIN : INT32_MAX; |
140 | overflow = 1; |
141 | } |
142 | } |
143 | |
144 | if (cc) { |
145 | env->cc_dst = x0; |
146 | env->cc_src2 = overflow; |
147 | env->cc_op = CC_OP_DIV; |
148 | } |
149 | return x0; |
150 | } |
151 | |
152 | target_ulong helper_sdiv(CPUSPARCState *env, target_ulong a, target_ulong b) |
153 | { |
154 | return do_sdiv(env, a, b, 0, GETPC()); |
155 | } |
156 | |
157 | target_ulong helper_sdiv_cc(CPUSPARCState *env, target_ulong a, target_ulong b) |
158 | { |
159 | return do_sdiv(env, a, b, 1, GETPC()); |
160 | } |
161 | |
162 | #ifdef TARGET_SPARC64 |
163 | int64_t helper_sdivx(CPUSPARCState *env, int64_t a, int64_t b) |
164 | { |
165 | if (b == 0) { |
166 | /* Raise divide by zero trap. */ |
167 | cpu_raise_exception_ra(env, TT_DIV_ZERO, GETPC()); |
168 | } else if (b == -1) { |
169 | /* Avoid overflow trap with i386 divide insn. */ |
170 | return -a; |
171 | } else { |
172 | return a / b; |
173 | } |
174 | } |
175 | |
176 | uint64_t helper_udivx(CPUSPARCState *env, uint64_t a, uint64_t b) |
177 | { |
178 | if (b == 0) { |
179 | /* Raise divide by zero trap. */ |
180 | cpu_raise_exception_ra(env, TT_DIV_ZERO, GETPC()); |
181 | } |
182 | return a / b; |
183 | } |
184 | #endif |
185 | |
186 | target_ulong helper_taddcctv(CPUSPARCState *env, target_ulong src1, |
187 | target_ulong src2) |
188 | { |
189 | target_ulong dst; |
190 | |
191 | /* Tag overflow occurs if either input has bits 0 or 1 set. */ |
192 | if ((src1 | src2) & 3) { |
193 | goto tag_overflow; |
194 | } |
195 | |
196 | dst = src1 + src2; |
197 | |
198 | /* Tag overflow occurs if the addition overflows. */ |
199 | if (~(src1 ^ src2) & (src1 ^ dst) & (1u << 31)) { |
200 | goto tag_overflow; |
201 | } |
202 | |
203 | /* Only modify the CC after any exceptions have been generated. */ |
204 | env->cc_op = CC_OP_TADDTV; |
205 | env->cc_src = src1; |
206 | env->cc_src2 = src2; |
207 | env->cc_dst = dst; |
208 | return dst; |
209 | |
210 | tag_overflow: |
211 | cpu_raise_exception_ra(env, TT_TOVF, GETPC()); |
212 | } |
213 | |
214 | target_ulong helper_tsubcctv(CPUSPARCState *env, target_ulong src1, |
215 | target_ulong src2) |
216 | { |
217 | target_ulong dst; |
218 | |
219 | /* Tag overflow occurs if either input has bits 0 or 1 set. */ |
220 | if ((src1 | src2) & 3) { |
221 | goto tag_overflow; |
222 | } |
223 | |
224 | dst = src1 - src2; |
225 | |
226 | /* Tag overflow occurs if the subtraction overflows. */ |
227 | if ((src1 ^ src2) & (src1 ^ dst) & (1u << 31)) { |
228 | goto tag_overflow; |
229 | } |
230 | |
231 | /* Only modify the CC after any exceptions have been generated. */ |
232 | env->cc_op = CC_OP_TSUBTV; |
233 | env->cc_src = src1; |
234 | env->cc_src2 = src2; |
235 | env->cc_dst = dst; |
236 | return dst; |
237 | |
238 | tag_overflow: |
239 | cpu_raise_exception_ra(env, TT_TOVF, GETPC()); |
240 | } |
241 | |
242 | #ifndef TARGET_SPARC64 |
243 | void helper_power_down(CPUSPARCState *env) |
244 | { |
245 | CPUState *cs = env_cpu(env); |
246 | |
247 | cs->halted = 1; |
248 | cs->exception_index = EXCP_HLT; |
249 | env->pc = env->npc; |
250 | env->npc = env->pc + 4; |
251 | cpu_loop_exit(cs); |
252 | } |
253 | #endif |
254 | |