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1 | /* |
2 | * M68K helper routines | |
3 | * | |
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 | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | #include "exec.h" | |
21 | ||
22 | #if defined(CONFIG_USER_ONLY) | |
23 | ||
24 | void do_interrupt(int is_hw) | |
25 | { | |
26 | env->exception_index = -1; | |
27 | } | |
28 | ||
29 | #else | |
30 | ||
31 | #define MMUSUFFIX _mmu | |
32 | #define GETPC() (__builtin_return_address(0)) | |
33 | ||
34 | #define SHIFT 0 | |
35 | #include "softmmu_template.h" | |
36 | ||
37 | #define SHIFT 1 | |
38 | #include "softmmu_template.h" | |
39 | ||
40 | #define SHIFT 2 | |
41 | #include "softmmu_template.h" | |
42 | ||
43 | #define SHIFT 3 | |
44 | #include "softmmu_template.h" | |
45 | ||
46 | /* Try to fill the TLB and return an exception if error. If retaddr is | |
47 | NULL, it means that the function was called in C code (i.e. not | |
48 | from generated code or from helper.c) */ | |
49 | /* XXX: fix it to restore all registers */ | |
50 | void tlb_fill (target_ulong addr, int is_write, int is_user, void *retaddr) | |
51 | { | |
52 | TranslationBlock *tb; | |
53 | CPUState *saved_env; | |
54 | target_phys_addr_t pc; | |
55 | int ret; | |
56 | ||
57 | /* XXX: hack to restore env in all cases, even if not called from | |
58 | generated code */ | |
59 | saved_env = env; | |
60 | env = cpu_single_env; | |
61 | ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, is_user, 1); | |
62 | if (__builtin_expect(ret, 0)) { | |
63 | if (retaddr) { | |
64 | /* now we have a real cpu fault */ | |
65 | pc = (target_phys_addr_t)retaddr; | |
66 | tb = tb_find_pc(pc); | |
67 | if (tb) { | |
68 | /* the PC is inside the translated code. It means that we have | |
69 | a virtual CPU fault */ | |
70 | cpu_restore_state(tb, env, pc, NULL); | |
71 | } | |
72 | } | |
73 | cpu_loop_exit(); | |
74 | } | |
75 | env = saved_env; | |
76 | } | |
77 | ||
78 | static void do_rte(void) | |
79 | { | |
80 | uint32_t sp; | |
81 | uint32_t fmt; | |
82 | ||
83 | sp = env->aregs[7]; | |
84 | fmt = ldl_kernel(sp); | |
85 | env->pc = ldl_kernel(sp + 4); | |
86 | sp |= (fmt >> 28) & 3; | |
87 | env->sr = fmt & 0xffff; | |
88 | env->aregs[7] = sp + 8; | |
89 | } | |
90 | ||
91 | void do_interrupt(int is_hw) | |
92 | { | |
93 | uint32_t sp; | |
94 | uint32_t fmt; | |
95 | uint32_t retaddr; | |
96 | uint32_t vector; | |
97 | ||
98 | fmt = 0; | |
99 | retaddr = env->pc; | |
100 | ||
101 | if (!is_hw) { | |
102 | switch (env->exception_index) { | |
103 | case EXCP_RTE: | |
104 | /* Return from an exception. */ | |
105 | do_rte(); | |
106 | return; | |
107 | } | |
108 | if (env->exception_index >= EXCP_TRAP0 | |
109 | && env->exception_index <= EXCP_TRAP15) { | |
110 | /* Move the PC after the trap instruction. */ | |
111 | retaddr += 2; | |
112 | } | |
113 | } | |
114 | ||
115 | /* TODO: Implement USP. */ | |
116 | sp = env->aregs[7]; | |
117 | ||
118 | vector = env->exception_index << 2; | |
119 | ||
120 | fmt |= 0x40000000; | |
121 | fmt |= (sp & 3) << 28; | |
122 | fmt |= vector << 16; | |
123 | fmt |= env->sr; | |
124 | ||
125 | /* ??? This could cause MMU faults. */ | |
126 | sp &= ~3; | |
127 | sp -= 4; | |
128 | stl_kernel(sp, retaddr); | |
129 | sp -= 4; | |
130 | stl_kernel(sp, fmt); | |
131 | env->aregs[7] = sp; | |
132 | env->sr |= SR_S; | |
133 | if (is_hw) { | |
134 | env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT); | |
135 | } | |
136 | /* Jump to vector. */ | |
137 | env->pc = ldl_kernel(env->vbr + vector); | |
138 | } | |
139 | ||
140 | #endif |