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19#include "qemu/osdep.h"
20#include "cpu.h"
21#include "exec/helper-proto.h"
22#include "exec/exec-all.h"
23#include "exec/cpu_ldst.h"
24#include "exec/semihost.h"
25
26#if defined(CONFIG_USER_ONLY)
27
28void m68k_cpu_do_interrupt(CPUState *cs)
29{
30 cs->exception_index = -1;
31}
32
33static inline void do_interrupt_m68k_hardirq(CPUM68KState *env)
34{
35}
36
37#else
38
39
40
41
42void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
43 int mmu_idx, uintptr_t retaddr)
44{
45 int ret;
46
47 ret = m68k_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
48 if (unlikely(ret)) {
49 if (retaddr) {
50
51 cpu_restore_state(cs, retaddr);
52 }
53 cpu_loop_exit(cs);
54 }
55}
56
57static void do_rte(CPUM68KState *env)
58{
59 uint32_t sp;
60 uint32_t fmt;
61
62 sp = env->aregs[7];
63 fmt = cpu_ldl_kernel(env, sp);
64 env->pc = cpu_ldl_kernel(env, sp + 4);
65 sp |= (fmt >> 28) & 3;
66 env->aregs[7] = sp + 8;
67
68 helper_set_sr(env, fmt);
69}
70
71static void do_interrupt_all(CPUM68KState *env, int is_hw)
72{
73 CPUState *cs = CPU(m68k_env_get_cpu(env));
74 uint32_t sp;
75 uint32_t fmt;
76 uint32_t retaddr;
77 uint32_t vector;
78
79 fmt = 0;
80 retaddr = env->pc;
81
82 if (!is_hw) {
83 switch (cs->exception_index) {
84 case EXCP_RTE:
85
86 do_rte(env);
87 return;
88 case EXCP_HALT_INSN:
89 if (semihosting_enabled()
90 && (env->sr & SR_S) != 0
91 && (env->pc & 3) == 0
92 && cpu_lduw_code(env, env->pc - 4) == 0x4e71
93 && cpu_ldl_code(env, env->pc) == 0x4e7bf000) {
94 env->pc += 4;
95 do_m68k_semihosting(env, env->dregs[0]);
96 return;
97 }
98 cs->halted = 1;
99 cs->exception_index = EXCP_HLT;
100 cpu_loop_exit(cs);
101 return;
102 }
103 if (cs->exception_index >= EXCP_TRAP0
104 && cs->exception_index <= EXCP_TRAP15) {
105
106 retaddr += 2;
107 }
108 }
109
110 vector = cs->exception_index << 2;
111
112 fmt |= 0x40000000;
113 fmt |= vector << 16;
114 fmt |= env->sr;
115 fmt |= cpu_m68k_get_ccr(env);
116
117 env->sr |= SR_S;
118 if (is_hw) {
119 env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
120 env->sr &= ~SR_M;
121 }
122 m68k_switch_sp(env);
123 sp = env->aregs[7];
124 fmt |= (sp & 3) << 28;
125
126
127 sp &= ~3;
128 sp -= 4;
129 cpu_stl_kernel(env, sp, retaddr);
130 sp -= 4;
131 cpu_stl_kernel(env, sp, fmt);
132 env->aregs[7] = sp;
133
134 env->pc = cpu_ldl_kernel(env, env->vbr + vector);
135}
136
137void m68k_cpu_do_interrupt(CPUState *cs)
138{
139 M68kCPU *cpu = M68K_CPU(cs);
140 CPUM68KState *env = &cpu->env;
141
142 do_interrupt_all(env, 0);
143}
144
145static inline void do_interrupt_m68k_hardirq(CPUM68KState *env)
146{
147 do_interrupt_all(env, 1);
148}
149#endif
150
151bool m68k_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
152{
153 M68kCPU *cpu = M68K_CPU(cs);
154 CPUM68KState *env = &cpu->env;
155
156 if (interrupt_request & CPU_INTERRUPT_HARD
157 && ((env->sr & SR_I) >> SR_I_SHIFT) < env->pending_level) {
158
159
160
161
162 cs->exception_index = env->pending_vector;
163 do_interrupt_m68k_hardirq(env);
164 return true;
165 }
166 return false;
167}
168
169static void raise_exception(CPUM68KState *env, int tt)
170{
171 CPUState *cs = CPU(m68k_env_get_cpu(env));
172
173 cs->exception_index = tt;
174 cpu_loop_exit(cs);
175}
176
177void HELPER(raise_exception)(CPUM68KState *env, uint32_t tt)
178{
179 raise_exception(env, tt);
180}
181
182void HELPER(divu)(CPUM68KState *env, uint32_t word)
183{
184 uint32_t num;
185 uint32_t den;
186 uint32_t quot;
187 uint32_t rem;
188
189 num = env->div1;
190 den = env->div2;
191
192 if (den == 0) {
193 raise_exception(env, EXCP_DIV0);
194 }
195 quot = num / den;
196 rem = num % den;
197
198 env->cc_v = (word && quot > 0xffff ? -1 : 0);
199 env->cc_z = quot;
200 env->cc_n = quot;
201 env->cc_c = 0;
202
203 env->div1 = quot;
204 env->div2 = rem;
205}
206
207void HELPER(divs)(CPUM68KState *env, uint32_t word)
208{
209 int32_t num;
210 int32_t den;
211 int32_t quot;
212 int32_t rem;
213
214 num = env->div1;
215 den = env->div2;
216 if (den == 0) {
217 raise_exception(env, EXCP_DIV0);
218 }
219 quot = num / den;
220 rem = num % den;
221
222 env->cc_v = (word && quot != (int16_t)quot ? -1 : 0);
223 env->cc_z = quot;
224 env->cc_n = quot;
225 env->cc_c = 0;
226
227 env->div1 = quot;
228 env->div2 = rem;
229}
230