root / target-m68k / op_helper.c @ a8a358bf
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1 | 0633879f | pbrook | /*
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2 | 0633879f | pbrook | * M68K helper routines
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3 | 5fafdf24 | ths | *
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4 | 0633879f | pbrook | * Copyright (c) 2007 CodeSourcery
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5 | 0633879f | pbrook | *
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6 | 0633879f | pbrook | * This library is free software; you can redistribute it and/or
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7 | 0633879f | pbrook | * modify it under the terms of the GNU Lesser General Public
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8 | 0633879f | pbrook | * License as published by the Free Software Foundation; either
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9 | 0633879f | pbrook | * version 2 of the License, or (at your option) any later version.
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10 | 0633879f | pbrook | *
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11 | 0633879f | pbrook | * This library is distributed in the hope that it will be useful,
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12 | 0633879f | pbrook | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 0633879f | pbrook | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 0633879f | pbrook | * Lesser General Public License for more details.
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15 | 0633879f | pbrook | *
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16 | 0633879f | pbrook | * You should have received a copy of the GNU Lesser General Public
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17 | 8167ee88 | Blue Swirl | * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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18 | 0633879f | pbrook | */
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19 | 0633879f | pbrook | #include "exec.h" |
20 | e1f3808e | pbrook | #include "helpers.h" |
21 | 0633879f | pbrook | |
22 | 0633879f | pbrook | #if defined(CONFIG_USER_ONLY)
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23 | 0633879f | pbrook | |
24 | 0633879f | pbrook | void do_interrupt(int is_hw) |
25 | 0633879f | pbrook | { |
26 | 0633879f | pbrook | env->exception_index = -1;
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27 | 0633879f | pbrook | } |
28 | 0633879f | pbrook | |
29 | 0633879f | pbrook | #else
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30 | 0633879f | pbrook | |
31 | a87295e8 | pbrook | extern int semihosting_enabled; |
32 | a87295e8 | pbrook | |
33 | 0633879f | pbrook | #define MMUSUFFIX _mmu
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34 | 0633879f | pbrook | |
35 | 0633879f | pbrook | #define SHIFT 0 |
36 | 0633879f | pbrook | #include "softmmu_template.h" |
37 | 0633879f | pbrook | |
38 | 0633879f | pbrook | #define SHIFT 1 |
39 | 0633879f | pbrook | #include "softmmu_template.h" |
40 | 0633879f | pbrook | |
41 | 0633879f | pbrook | #define SHIFT 2 |
42 | 0633879f | pbrook | #include "softmmu_template.h" |
43 | 0633879f | pbrook | |
44 | 0633879f | pbrook | #define SHIFT 3 |
45 | 0633879f | pbrook | #include "softmmu_template.h" |
46 | 0633879f | pbrook | |
47 | 0633879f | pbrook | /* Try to fill the TLB and return an exception if error. If retaddr is
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48 | 0633879f | pbrook | NULL, it means that the function was called in C code (i.e. not
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49 | 0633879f | pbrook | from generated code or from helper.c) */
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50 | 0633879f | pbrook | /* XXX: fix it to restore all registers */
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51 | 6ebbf390 | j_mayer | void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) |
52 | 0633879f | pbrook | { |
53 | 0633879f | pbrook | TranslationBlock *tb; |
54 | 0633879f | pbrook | CPUState *saved_env; |
55 | 44f8625d | bellard | unsigned long pc; |
56 | 0633879f | pbrook | int ret;
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57 | 0633879f | pbrook | |
58 | 0633879f | pbrook | /* XXX: hack to restore env in all cases, even if not called from
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59 | 0633879f | pbrook | generated code */
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60 | 0633879f | pbrook | saved_env = env; |
61 | 0633879f | pbrook | env = cpu_single_env; |
62 | 6ebbf390 | j_mayer | ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
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63 | 551bd27f | ths | if (unlikely(ret)) {
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64 | 0633879f | pbrook | if (retaddr) {
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65 | 0633879f | pbrook | /* now we have a real cpu fault */
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66 | 44f8625d | bellard | pc = (unsigned long)retaddr; |
67 | 0633879f | pbrook | tb = tb_find_pc(pc); |
68 | 0633879f | pbrook | if (tb) {
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69 | 0633879f | pbrook | /* the PC is inside the translated code. It means that we have
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70 | 0633879f | pbrook | a virtual CPU fault */
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71 | 0633879f | pbrook | cpu_restore_state(tb, env, pc, NULL);
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72 | 0633879f | pbrook | } |
73 | 0633879f | pbrook | } |
74 | 0633879f | pbrook | cpu_loop_exit(); |
75 | 0633879f | pbrook | } |
76 | 0633879f | pbrook | env = saved_env; |
77 | 0633879f | pbrook | } |
78 | 0633879f | pbrook | |
79 | 0633879f | pbrook | static void do_rte(void) |
80 | 0633879f | pbrook | { |
81 | 0633879f | pbrook | uint32_t sp; |
82 | 0633879f | pbrook | uint32_t fmt; |
83 | 0633879f | pbrook | |
84 | 0633879f | pbrook | sp = env->aregs[7];
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85 | 0633879f | pbrook | fmt = ldl_kernel(sp); |
86 | 0633879f | pbrook | env->pc = ldl_kernel(sp + 4);
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87 | 0633879f | pbrook | sp |= (fmt >> 28) & 3; |
88 | 0633879f | pbrook | env->sr = fmt & 0xffff;
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89 | 20dcee94 | pbrook | m68k_switch_sp(env); |
90 | 0633879f | pbrook | env->aregs[7] = sp + 8; |
91 | 0633879f | pbrook | } |
92 | 0633879f | pbrook | |
93 | 0633879f | pbrook | void do_interrupt(int is_hw) |
94 | 0633879f | pbrook | { |
95 | 0633879f | pbrook | uint32_t sp; |
96 | 0633879f | pbrook | uint32_t fmt; |
97 | 0633879f | pbrook | uint32_t retaddr; |
98 | 0633879f | pbrook | uint32_t vector; |
99 | 0633879f | pbrook | |
100 | 0633879f | pbrook | fmt = 0;
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101 | 0633879f | pbrook | retaddr = env->pc; |
102 | 0633879f | pbrook | |
103 | 0633879f | pbrook | if (!is_hw) {
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104 | 0633879f | pbrook | switch (env->exception_index) {
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105 | 0633879f | pbrook | case EXCP_RTE:
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106 | 0633879f | pbrook | /* Return from an exception. */
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107 | 0633879f | pbrook | do_rte(); |
108 | 0633879f | pbrook | return;
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109 | a87295e8 | pbrook | case EXCP_HALT_INSN:
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110 | a87295e8 | pbrook | if (semihosting_enabled
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111 | a87295e8 | pbrook | && (env->sr & SR_S) != 0
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112 | a87295e8 | pbrook | && (env->pc & 3) == 0 |
113 | a87295e8 | pbrook | && lduw_code(env->pc - 4) == 0x4e71 |
114 | a87295e8 | pbrook | && ldl_code(env->pc) == 0x4e7bf000) {
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115 | a87295e8 | pbrook | env->pc += 4;
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116 | a87295e8 | pbrook | do_m68k_semihosting(env, env->dregs[0]);
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117 | a87295e8 | pbrook | return;
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118 | a87295e8 | pbrook | } |
119 | a87295e8 | pbrook | env->halted = 1;
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120 | a87295e8 | pbrook | env->exception_index = EXCP_HLT; |
121 | a87295e8 | pbrook | cpu_loop_exit(); |
122 | a87295e8 | pbrook | return;
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123 | 0633879f | pbrook | } |
124 | 0633879f | pbrook | if (env->exception_index >= EXCP_TRAP0
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125 | 0633879f | pbrook | && env->exception_index <= EXCP_TRAP15) { |
126 | 0633879f | pbrook | /* Move the PC after the trap instruction. */
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127 | 0633879f | pbrook | retaddr += 2;
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128 | 0633879f | pbrook | } |
129 | 0633879f | pbrook | } |
130 | 0633879f | pbrook | |
131 | 0633879f | pbrook | vector = env->exception_index << 2;
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132 | 0633879f | pbrook | |
133 | 0cf5c677 | pbrook | sp = env->aregs[7];
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134 | 0cf5c677 | pbrook | |
135 | 0633879f | pbrook | fmt |= 0x40000000;
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136 | 0633879f | pbrook | fmt |= (sp & 3) << 28; |
137 | 0633879f | pbrook | fmt |= vector << 16;
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138 | 0633879f | pbrook | fmt |= env->sr; |
139 | 0633879f | pbrook | |
140 | 20dcee94 | pbrook | env->sr |= SR_S; |
141 | 20dcee94 | pbrook | if (is_hw) {
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142 | 20dcee94 | pbrook | env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT); |
143 | 20dcee94 | pbrook | env->sr &= ~SR_M; |
144 | 20dcee94 | pbrook | } |
145 | 20dcee94 | pbrook | m68k_switch_sp(env); |
146 | 20dcee94 | pbrook | |
147 | 0633879f | pbrook | /* ??? This could cause MMU faults. */
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148 | 0633879f | pbrook | sp &= ~3;
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149 | 0633879f | pbrook | sp -= 4;
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150 | 0633879f | pbrook | stl_kernel(sp, retaddr); |
151 | 0633879f | pbrook | sp -= 4;
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152 | 0633879f | pbrook | stl_kernel(sp, fmt); |
153 | 0633879f | pbrook | env->aregs[7] = sp;
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154 | 0633879f | pbrook | /* Jump to vector. */
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155 | 0633879f | pbrook | env->pc = ldl_kernel(env->vbr + vector); |
156 | 0633879f | pbrook | } |
157 | 0633879f | pbrook | |
158 | 0633879f | pbrook | #endif
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159 | e1f3808e | pbrook | |
160 | e1f3808e | pbrook | static void raise_exception(int tt) |
161 | e1f3808e | pbrook | { |
162 | e1f3808e | pbrook | env->exception_index = tt; |
163 | e1f3808e | pbrook | cpu_loop_exit(); |
164 | e1f3808e | pbrook | } |
165 | e1f3808e | pbrook | |
166 | e1f3808e | pbrook | void HELPER(raise_exception)(uint32_t tt)
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167 | e1f3808e | pbrook | { |
168 | e1f3808e | pbrook | raise_exception(tt); |
169 | e1f3808e | pbrook | } |
170 | e1f3808e | pbrook | |
171 | e1f3808e | pbrook | void HELPER(divu)(CPUState *env, uint32_t word)
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172 | e1f3808e | pbrook | { |
173 | e1f3808e | pbrook | uint32_t num; |
174 | e1f3808e | pbrook | uint32_t den; |
175 | e1f3808e | pbrook | uint32_t quot; |
176 | e1f3808e | pbrook | uint32_t rem; |
177 | e1f3808e | pbrook | uint32_t flags; |
178 | e1f3808e | pbrook | |
179 | e1f3808e | pbrook | num = env->div1; |
180 | e1f3808e | pbrook | den = env->div2; |
181 | e1f3808e | pbrook | /* ??? This needs to make sure the throwing location is accurate. */
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182 | e1f3808e | pbrook | if (den == 0) |
183 | e1f3808e | pbrook | raise_exception(EXCP_DIV0); |
184 | e1f3808e | pbrook | quot = num / den; |
185 | e1f3808e | pbrook | rem = num % den; |
186 | e1f3808e | pbrook | flags = 0;
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187 | e1f3808e | pbrook | /* Avoid using a PARAM1 of zero. This breaks dyngen because it uses
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188 | e1f3808e | pbrook | the address of a symbol, and gcc knows symbols can't have address
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189 | e1f3808e | pbrook | zero. */
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190 | e1f3808e | pbrook | if (word && quot > 0xffff) |
191 | e1f3808e | pbrook | flags |= CCF_V; |
192 | e1f3808e | pbrook | if (quot == 0) |
193 | e1f3808e | pbrook | flags |= CCF_Z; |
194 | e1f3808e | pbrook | else if ((int32_t)quot < 0) |
195 | e1f3808e | pbrook | flags |= CCF_N; |
196 | e1f3808e | pbrook | env->div1 = quot; |
197 | e1f3808e | pbrook | env->div2 = rem; |
198 | e1f3808e | pbrook | env->cc_dest = flags; |
199 | e1f3808e | pbrook | } |
200 | e1f3808e | pbrook | |
201 | e1f3808e | pbrook | void HELPER(divs)(CPUState *env, uint32_t word)
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202 | e1f3808e | pbrook | { |
203 | e1f3808e | pbrook | int32_t num; |
204 | e1f3808e | pbrook | int32_t den; |
205 | e1f3808e | pbrook | int32_t quot; |
206 | e1f3808e | pbrook | int32_t rem; |
207 | e1f3808e | pbrook | int32_t flags; |
208 | e1f3808e | pbrook | |
209 | e1f3808e | pbrook | num = env->div1; |
210 | e1f3808e | pbrook | den = env->div2; |
211 | e1f3808e | pbrook | if (den == 0) |
212 | e1f3808e | pbrook | raise_exception(EXCP_DIV0); |
213 | e1f3808e | pbrook | quot = num / den; |
214 | e1f3808e | pbrook | rem = num % den; |
215 | e1f3808e | pbrook | flags = 0;
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216 | e1f3808e | pbrook | if (word && quot != (int16_t)quot)
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217 | e1f3808e | pbrook | flags |= CCF_V; |
218 | e1f3808e | pbrook | if (quot == 0) |
219 | e1f3808e | pbrook | flags |= CCF_Z; |
220 | e1f3808e | pbrook | else if (quot < 0) |
221 | e1f3808e | pbrook | flags |= CCF_N; |
222 | e1f3808e | pbrook | env->div1 = quot; |
223 | e1f3808e | pbrook | env->div2 = rem; |
224 | e1f3808e | pbrook | env->cc_dest = flags; |
225 | e1f3808e | pbrook | } |