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
helper_raise_exception(CPUMoxieState * env,int ex)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
helper_div(CPUMoxieState * env,uint32_t a,uint32_t b)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
helper_udiv(CPUMoxieState * env,uint32_t a,uint32_t b)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
helper_debug(CPUMoxieState * env)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
moxie_cpu_tlb_fill(CPUState * cs,vaddr address,int size,MMUAccessType access_type,int mmu_idx,bool probe,uintptr_t retaddr)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
moxie_cpu_do_interrupt(CPUState * cs)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
moxie_cpu_get_phys_page_debug(CPUState * cs,vaddr addr)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