1 | /* |
2 | * Moxie helper routines. |
3 | * |
4 | * Copyright (c) 2008, 2009, 2010, 2013 Anthony Green |
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 2.1 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 License |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
18 | */ |
19 | |
20 | #include "qemu/osdep.h" |
21 | |
22 | #include "cpu.h" |
23 | #include "mmu.h" |
24 | #include "exec/exec-all.h" |
25 | #include "exec/cpu_ldst.h" |
26 | #include "qemu/host-utils.h" |
27 | #include "exec/helper-proto.h" |
28 | |
29 | void helper_raise_exception(CPUMoxieState *env, int ex) |
30 | { |
31 | CPUState *cs = env_cpu(env); |
32 | |
33 | cs->exception_index = ex; |
34 | /* Stash the exception type. */ |
35 | env->sregs[2] = ex; |
36 | /* Stash the address where the exception occurred. */ |
37 | cpu_restore_state(cs, GETPC(), true); |
38 | env->sregs[5] = env->pc; |
39 | /* Jump to the exception handline routine. */ |
40 | env->pc = env->sregs[1]; |
41 | cpu_loop_exit(cs); |
42 | } |
43 | |
44 | uint32_t helper_div(CPUMoxieState *env, uint32_t a, uint32_t b) |
45 | { |
46 | if (unlikely(b == 0)) { |
47 | helper_raise_exception(env, MOXIE_EX_DIV0); |
48 | return 0; |
49 | } |
50 | if (unlikely(a == INT_MIN && b == -1)) { |
51 | return INT_MIN; |
52 | } |
53 | |
54 | return (int32_t)a / (int32_t)b; |
55 | } |
56 | |
57 | uint32_t helper_udiv(CPUMoxieState *env, uint32_t a, uint32_t b) |
58 | { |
59 | if (unlikely(b == 0)) { |
60 | helper_raise_exception(env, MOXIE_EX_DIV0); |
61 | return 0; |
62 | } |
63 | return a / b; |
64 | } |
65 | |
66 | void helper_debug(CPUMoxieState *env) |
67 | { |
68 | CPUState *cs = env_cpu(env); |
69 | |
70 | cs->exception_index = EXCP_DEBUG; |
71 | cpu_loop_exit(cs); |
72 | } |
73 | |
74 | bool moxie_cpu_tlb_fill(CPUState *cs, vaddr address, int size, |
75 | MMUAccessType access_type, int mmu_idx, |
76 | bool probe, uintptr_t retaddr) |
77 | { |
78 | MoxieCPU *cpu = MOXIE_CPU(cs); |
79 | CPUMoxieState *env = &cpu->env; |
80 | MoxieMMUResult res; |
81 | int prot, miss; |
82 | |
83 | address &= TARGET_PAGE_MASK; |
84 | prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; |
85 | miss = moxie_mmu_translate(&res, env, address, access_type, mmu_idx); |
86 | if (likely(!miss)) { |
87 | tlb_set_page(cs, address, res.phy, prot, mmu_idx, TARGET_PAGE_SIZE); |
88 | return true; |
89 | } |
90 | if (probe) { |
91 | return false; |
92 | } |
93 | |
94 | cs->exception_index = MOXIE_EX_MMU_MISS; |
95 | cpu_loop_exit_restore(cs, retaddr); |
96 | } |
97 | |
98 | void moxie_cpu_do_interrupt(CPUState *cs) |
99 | { |
100 | switch (cs->exception_index) { |
101 | case MOXIE_EX_BREAK: |
102 | break; |
103 | default: |
104 | break; |
105 | } |
106 | } |
107 | |
108 | hwaddr moxie_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) |
109 | { |
110 | MoxieCPU *cpu = MOXIE_CPU(cs); |
111 | uint32_t phy = addr; |
112 | MoxieMMUResult res; |
113 | int miss; |
114 | |
115 | miss = moxie_mmu_translate(&res, &cpu->env, addr, 0, 0); |
116 | if (!miss) { |
117 | phy = res.phy; |
118 | } |
119 | return phy; |
120 | } |
121 | |