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0633879f PB |
1 | /* |
2 | * M68K helper routines | |
5fafdf24 | 3 | * |
0633879f PB |
4 | * Copyright (c) 2007 CodeSourcery |
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 | |
8167ee88 | 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
0633879f PB |
18 | */ |
19 | #include "exec.h" | |
e1f3808e | 20 | #include "helpers.h" |
0633879f PB |
21 | |
22 | #if defined(CONFIG_USER_ONLY) | |
23 | ||
3c688828 BS |
24 | void do_interrupt(CPUState *env1) |
25 | { | |
26 | env1->exception_index = -1; | |
27 | } | |
28 | ||
29 | void do_interrupt_m68k_hardirq(CPUState *env1) | |
0633879f | 30 | { |
0633879f PB |
31 | } |
32 | ||
33 | #else | |
34 | ||
a87295e8 PB |
35 | extern int semihosting_enabled; |
36 | ||
0633879f | 37 | #define MMUSUFFIX _mmu |
0633879f PB |
38 | |
39 | #define SHIFT 0 | |
40 | #include "softmmu_template.h" | |
41 | ||
42 | #define SHIFT 1 | |
43 | #include "softmmu_template.h" | |
44 | ||
45 | #define SHIFT 2 | |
46 | #include "softmmu_template.h" | |
47 | ||
48 | #define SHIFT 3 | |
49 | #include "softmmu_template.h" | |
50 | ||
51 | /* Try to fill the TLB and return an exception if error. If retaddr is | |
52 | NULL, it means that the function was called in C code (i.e. not | |
53 | from generated code or from helper.c) */ | |
54 | /* XXX: fix it to restore all registers */ | |
6ebbf390 | 55 | void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) |
0633879f PB |
56 | { |
57 | TranslationBlock *tb; | |
58 | CPUState *saved_env; | |
44f8625d | 59 | unsigned long pc; |
0633879f PB |
60 | int ret; |
61 | ||
62 | /* XXX: hack to restore env in all cases, even if not called from | |
63 | generated code */ | |
64 | saved_env = env; | |
65 | env = cpu_single_env; | |
6ebbf390 | 66 | ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx, 1); |
551bd27f | 67 | if (unlikely(ret)) { |
0633879f PB |
68 | if (retaddr) { |
69 | /* now we have a real cpu fault */ | |
44f8625d | 70 | pc = (unsigned long)retaddr; |
0633879f PB |
71 | tb = tb_find_pc(pc); |
72 | if (tb) { | |
73 | /* the PC is inside the translated code. It means that we have | |
74 | a virtual CPU fault */ | |
618ba8e6 | 75 | cpu_restore_state(tb, env, pc); |
0633879f PB |
76 | } |
77 | } | |
1162c041 | 78 | cpu_loop_exit(env); |
0633879f PB |
79 | } |
80 | env = saved_env; | |
81 | } | |
82 | ||
83 | static void do_rte(void) | |
84 | { | |
85 | uint32_t sp; | |
86 | uint32_t fmt; | |
87 | ||
88 | sp = env->aregs[7]; | |
89 | fmt = ldl_kernel(sp); | |
90 | env->pc = ldl_kernel(sp + 4); | |
91 | sp |= (fmt >> 28) & 3; | |
92 | env->sr = fmt & 0xffff; | |
20dcee94 | 93 | m68k_switch_sp(env); |
0633879f PB |
94 | env->aregs[7] = sp + 8; |
95 | } | |
96 | ||
3c688828 | 97 | static void do_interrupt_all(int is_hw) |
0633879f PB |
98 | { |
99 | uint32_t sp; | |
100 | uint32_t fmt; | |
101 | uint32_t retaddr; | |
102 | uint32_t vector; | |
103 | ||
104 | fmt = 0; | |
105 | retaddr = env->pc; | |
106 | ||
107 | if (!is_hw) { | |
108 | switch (env->exception_index) { | |
109 | case EXCP_RTE: | |
110 | /* Return from an exception. */ | |
111 | do_rte(); | |
112 | return; | |
a87295e8 PB |
113 | case EXCP_HALT_INSN: |
114 | if (semihosting_enabled | |
115 | && (env->sr & SR_S) != 0 | |
116 | && (env->pc & 3) == 0 | |
117 | && lduw_code(env->pc - 4) == 0x4e71 | |
118 | && ldl_code(env->pc) == 0x4e7bf000) { | |
119 | env->pc += 4; | |
120 | do_m68k_semihosting(env, env->dregs[0]); | |
121 | return; | |
122 | } | |
123 | env->halted = 1; | |
124 | env->exception_index = EXCP_HLT; | |
1162c041 | 125 | cpu_loop_exit(env); |
a87295e8 | 126 | return; |
0633879f PB |
127 | } |
128 | if (env->exception_index >= EXCP_TRAP0 | |
129 | && env->exception_index <= EXCP_TRAP15) { | |
130 | /* Move the PC after the trap instruction. */ | |
131 | retaddr += 2; | |
132 | } | |
133 | } | |
134 | ||
0633879f PB |
135 | vector = env->exception_index << 2; |
136 | ||
0cf5c677 PB |
137 | sp = env->aregs[7]; |
138 | ||
0633879f PB |
139 | fmt |= 0x40000000; |
140 | fmt |= (sp & 3) << 28; | |
141 | fmt |= vector << 16; | |
142 | fmt |= env->sr; | |
143 | ||
20dcee94 PB |
144 | env->sr |= SR_S; |
145 | if (is_hw) { | |
146 | env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT); | |
147 | env->sr &= ~SR_M; | |
148 | } | |
149 | m68k_switch_sp(env); | |
150 | ||
0633879f PB |
151 | /* ??? This could cause MMU faults. */ |
152 | sp &= ~3; | |
153 | sp -= 4; | |
154 | stl_kernel(sp, retaddr); | |
155 | sp -= 4; | |
156 | stl_kernel(sp, fmt); | |
157 | env->aregs[7] = sp; | |
0633879f PB |
158 | /* Jump to vector. */ |
159 | env->pc = ldl_kernel(env->vbr + vector); | |
160 | } | |
161 | ||
3c688828 BS |
162 | void do_interrupt(CPUState *env1) |
163 | { | |
164 | CPUState *saved_env; | |
165 | ||
166 | saved_env = env; | |
167 | env = env1; | |
168 | do_interrupt_all(0); | |
169 | env = saved_env; | |
170 | } | |
171 | ||
172 | void do_interrupt_m68k_hardirq(CPUState *env1) | |
173 | { | |
174 | CPUState *saved_env; | |
175 | ||
176 | saved_env = env; | |
177 | env = env1; | |
178 | do_interrupt_all(1); | |
179 | env = saved_env; | |
180 | } | |
0633879f | 181 | #endif |
e1f3808e PB |
182 | |
183 | static void raise_exception(int tt) | |
184 | { | |
185 | env->exception_index = tt; | |
1162c041 | 186 | cpu_loop_exit(env); |
e1f3808e PB |
187 | } |
188 | ||
189 | void HELPER(raise_exception)(uint32_t tt) | |
190 | { | |
191 | raise_exception(tt); | |
192 | } | |
193 | ||
194 | void HELPER(divu)(CPUState *env, uint32_t word) | |
195 | { | |
196 | uint32_t num; | |
197 | uint32_t den; | |
198 | uint32_t quot; | |
199 | uint32_t rem; | |
200 | uint32_t flags; | |
201 | ||
202 | num = env->div1; | |
203 | den = env->div2; | |
204 | /* ??? This needs to make sure the throwing location is accurate. */ | |
205 | if (den == 0) | |
206 | raise_exception(EXCP_DIV0); | |
207 | quot = num / den; | |
208 | rem = num % den; | |
209 | flags = 0; | |
210 | /* Avoid using a PARAM1 of zero. This breaks dyngen because it uses | |
211 | the address of a symbol, and gcc knows symbols can't have address | |
212 | zero. */ | |
213 | if (word && quot > 0xffff) | |
214 | flags |= CCF_V; | |
215 | if (quot == 0) | |
216 | flags |= CCF_Z; | |
217 | else if ((int32_t)quot < 0) | |
218 | flags |= CCF_N; | |
219 | env->div1 = quot; | |
220 | env->div2 = rem; | |
221 | env->cc_dest = flags; | |
222 | } | |
223 | ||
224 | void HELPER(divs)(CPUState *env, uint32_t word) | |
225 | { | |
226 | int32_t num; | |
227 | int32_t den; | |
228 | int32_t quot; | |
229 | int32_t rem; | |
230 | int32_t flags; | |
231 | ||
232 | num = env->div1; | |
233 | den = env->div2; | |
234 | if (den == 0) | |
235 | raise_exception(EXCP_DIV0); | |
236 | quot = num / den; | |
237 | rem = num % den; | |
238 | flags = 0; | |
239 | if (word && quot != (int16_t)quot) | |
240 | flags |= CCF_V; | |
241 | if (quot == 0) | |
242 | flags |= CCF_Z; | |
243 | else if (quot < 0) | |
244 | flags |= CCF_N; | |
245 | env->div1 = quot; | |
246 | env->div2 = rem; | |
247 | env->cc_dest = flags; | |
248 | } |