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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 | |
17 | * License along with this library; if not, write to the Free Software | |
fad6cb1a | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA |
0633879f PB |
19 | */ |
20 | #include "exec.h" | |
e1f3808e | 21 | #include "helpers.h" |
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22 | |
23 | #if defined(CONFIG_USER_ONLY) | |
24 | ||
25 | void do_interrupt(int is_hw) | |
26 | { | |
27 | env->exception_index = -1; | |
28 | } | |
29 | ||
30 | #else | |
31 | ||
a87295e8 PB |
32 | extern int semihosting_enabled; |
33 | ||
0633879f | 34 | #define MMUSUFFIX _mmu |
0633879f PB |
35 | |
36 | #define SHIFT 0 | |
37 | #include "softmmu_template.h" | |
38 | ||
39 | #define SHIFT 1 | |
40 | #include "softmmu_template.h" | |
41 | ||
42 | #define SHIFT 2 | |
43 | #include "softmmu_template.h" | |
44 | ||
45 | #define SHIFT 3 | |
46 | #include "softmmu_template.h" | |
47 | ||
48 | /* Try to fill the TLB and return an exception if error. If retaddr is | |
49 | NULL, it means that the function was called in C code (i.e. not | |
50 | from generated code or from helper.c) */ | |
51 | /* XXX: fix it to restore all registers */ | |
6ebbf390 | 52 | void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) |
0633879f PB |
53 | { |
54 | TranslationBlock *tb; | |
55 | CPUState *saved_env; | |
44f8625d | 56 | unsigned long pc; |
0633879f PB |
57 | int ret; |
58 | ||
59 | /* XXX: hack to restore env in all cases, even if not called from | |
60 | generated code */ | |
61 | saved_env = env; | |
62 | env = cpu_single_env; | |
6ebbf390 | 63 | ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx, 1); |
551bd27f | 64 | if (unlikely(ret)) { |
0633879f PB |
65 | if (retaddr) { |
66 | /* now we have a real cpu fault */ | |
44f8625d | 67 | pc = (unsigned long)retaddr; |
0633879f PB |
68 | tb = tb_find_pc(pc); |
69 | if (tb) { | |
70 | /* the PC is inside the translated code. It means that we have | |
71 | a virtual CPU fault */ | |
72 | cpu_restore_state(tb, env, pc, NULL); | |
73 | } | |
74 | } | |
75 | cpu_loop_exit(); | |
76 | } | |
77 | env = saved_env; | |
78 | } | |
79 | ||
80 | static void do_rte(void) | |
81 | { | |
82 | uint32_t sp; | |
83 | uint32_t fmt; | |
84 | ||
85 | sp = env->aregs[7]; | |
86 | fmt = ldl_kernel(sp); | |
87 | env->pc = ldl_kernel(sp + 4); | |
88 | sp |= (fmt >> 28) & 3; | |
89 | env->sr = fmt & 0xffff; | |
20dcee94 | 90 | m68k_switch_sp(env); |
0633879f PB |
91 | env->aregs[7] = sp + 8; |
92 | } | |
93 | ||
94 | void do_interrupt(int is_hw) | |
95 | { | |
96 | uint32_t sp; | |
97 | uint32_t fmt; | |
98 | uint32_t retaddr; | |
99 | uint32_t vector; | |
100 | ||
101 | fmt = 0; | |
102 | retaddr = env->pc; | |
103 | ||
104 | if (!is_hw) { | |
105 | switch (env->exception_index) { | |
106 | case EXCP_RTE: | |
107 | /* Return from an exception. */ | |
108 | do_rte(); | |
109 | return; | |
a87295e8 PB |
110 | case EXCP_HALT_INSN: |
111 | if (semihosting_enabled | |
112 | && (env->sr & SR_S) != 0 | |
113 | && (env->pc & 3) == 0 | |
114 | && lduw_code(env->pc - 4) == 0x4e71 | |
115 | && ldl_code(env->pc) == 0x4e7bf000) { | |
116 | env->pc += 4; | |
117 | do_m68k_semihosting(env, env->dregs[0]); | |
118 | return; | |
119 | } | |
120 | env->halted = 1; | |
121 | env->exception_index = EXCP_HLT; | |
122 | cpu_loop_exit(); | |
123 | return; | |
0633879f PB |
124 | } |
125 | if (env->exception_index >= EXCP_TRAP0 | |
126 | && env->exception_index <= EXCP_TRAP15) { | |
127 | /* Move the PC after the trap instruction. */ | |
128 | retaddr += 2; | |
129 | } | |
130 | } | |
131 | ||
0633879f PB |
132 | vector = env->exception_index << 2; |
133 | ||
0cf5c677 PB |
134 | sp = env->aregs[7]; |
135 | ||
0633879f PB |
136 | fmt |= 0x40000000; |
137 | fmt |= (sp & 3) << 28; | |
138 | fmt |= vector << 16; | |
139 | fmt |= env->sr; | |
140 | ||
20dcee94 PB |
141 | env->sr |= SR_S; |
142 | if (is_hw) { | |
143 | env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT); | |
144 | env->sr &= ~SR_M; | |
145 | } | |
146 | m68k_switch_sp(env); | |
147 | ||
0633879f PB |
148 | /* ??? This could cause MMU faults. */ |
149 | sp &= ~3; | |
150 | sp -= 4; | |
151 | stl_kernel(sp, retaddr); | |
152 | sp -= 4; | |
153 | stl_kernel(sp, fmt); | |
154 | env->aregs[7] = sp; | |
0633879f PB |
155 | /* Jump to vector. */ |
156 | env->pc = ldl_kernel(env->vbr + vector); | |
157 | } | |
158 | ||
159 | #endif | |
e1f3808e PB |
160 | |
161 | static void raise_exception(int tt) | |
162 | { | |
163 | env->exception_index = tt; | |
164 | cpu_loop_exit(); | |
165 | } | |
166 | ||
167 | void HELPER(raise_exception)(uint32_t tt) | |
168 | { | |
169 | raise_exception(tt); | |
170 | } | |
171 | ||
172 | void HELPER(divu)(CPUState *env, uint32_t word) | |
173 | { | |
174 | uint32_t num; | |
175 | uint32_t den; | |
176 | uint32_t quot; | |
177 | uint32_t rem; | |
178 | uint32_t flags; | |
179 | ||
180 | num = env->div1; | |
181 | den = env->div2; | |
182 | /* ??? This needs to make sure the throwing location is accurate. */ | |
183 | if (den == 0) | |
184 | raise_exception(EXCP_DIV0); | |
185 | quot = num / den; | |
186 | rem = num % den; | |
187 | flags = 0; | |
188 | /* Avoid using a PARAM1 of zero. This breaks dyngen because it uses | |
189 | the address of a symbol, and gcc knows symbols can't have address | |
190 | zero. */ | |
191 | if (word && quot > 0xffff) | |
192 | flags |= CCF_V; | |
193 | if (quot == 0) | |
194 | flags |= CCF_Z; | |
195 | else if ((int32_t)quot < 0) | |
196 | flags |= CCF_N; | |
197 | env->div1 = quot; | |
198 | env->div2 = rem; | |
199 | env->cc_dest = flags; | |
200 | } | |
201 | ||
202 | void HELPER(divs)(CPUState *env, uint32_t word) | |
203 | { | |
204 | int32_t num; | |
205 | int32_t den; | |
206 | int32_t quot; | |
207 | int32_t rem; | |
208 | int32_t flags; | |
209 | ||
210 | num = env->div1; | |
211 | den = env->div2; | |
212 | if (den == 0) | |
213 | raise_exception(EXCP_DIV0); | |
214 | quot = num / den; | |
215 | rem = num % den; | |
216 | flags = 0; | |
217 | if (word && quot != (int16_t)quot) | |
218 | flags |= CCF_V; | |
219 | if (quot == 0) | |
220 | flags |= CCF_Z; | |
221 | else if (quot < 0) | |
222 | flags |= CCF_N; | |
223 | env->div1 = quot; | |
224 | env->div2 = rem; | |
225 | env->cc_dest = flags; | |
226 | } |