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4acb54ba EI |
1 | /* |
2 | * Microblaze helper routines. | |
3 | * | |
4 | * Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>. | |
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 | |
8167ee88 | 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
4acb54ba EI |
18 | */ |
19 | ||
20 | #include <assert.h> | |
21 | #include "exec.h" | |
22 | #include "helper.h" | |
23 | #include "host-utils.h" | |
24 | ||
25 | #define D(x) | |
26 | ||
27 | #if !defined(CONFIG_USER_ONLY) | |
28 | #define MMUSUFFIX _mmu | |
29 | #define SHIFT 0 | |
30 | #include "softmmu_template.h" | |
31 | #define SHIFT 1 | |
32 | #include "softmmu_template.h" | |
33 | #define SHIFT 2 | |
34 | #include "softmmu_template.h" | |
35 | #define SHIFT 3 | |
36 | #include "softmmu_template.h" | |
37 | ||
38 | /* Try to fill the TLB and return an exception if error. If retaddr is | |
39 | NULL, it means that the function was called in C code (i.e. not | |
40 | from generated code or from helper.c) */ | |
41 | /* XXX: fix it to restore all registers */ | |
42 | void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) | |
43 | { | |
44 | TranslationBlock *tb; | |
45 | CPUState *saved_env; | |
46 | unsigned long pc; | |
47 | int ret; | |
48 | ||
49 | /* XXX: hack to restore env in all cases, even if not called from | |
50 | generated code */ | |
51 | saved_env = env; | |
52 | env = cpu_single_env; | |
53 | ||
54 | ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx, 1); | |
55 | if (unlikely(ret)) { | |
56 | if (retaddr) { | |
57 | /* now we have a real cpu fault */ | |
58 | pc = (unsigned long)retaddr; | |
59 | tb = tb_find_pc(pc); | |
60 | if (tb) { | |
61 | /* the PC is inside the translated code. It means that we have | |
62 | a virtual CPU fault */ | |
63 | cpu_restore_state(tb, env, pc, NULL); | |
64 | } | |
65 | } | |
66 | cpu_loop_exit(); | |
67 | } | |
68 | env = saved_env; | |
69 | } | |
70 | #endif | |
71 | ||
72 | void helper_raise_exception(uint32_t index) | |
73 | { | |
74 | env->exception_index = index; | |
75 | cpu_loop_exit(); | |
76 | } | |
77 | ||
78 | void helper_debug(void) | |
79 | { | |
80 | int i; | |
81 | ||
82 | qemu_log("PC=%8.8x\n", env->sregs[SR_PC]); | |
83 | for (i = 0; i < 32; i++) { | |
84 | qemu_log("r%2.2d=%8.8x ", i, env->regs[i]); | |
85 | if ((i + 1) % 4 == 0) | |
86 | qemu_log("\n"); | |
87 | } | |
88 | qemu_log("\n\n"); | |
89 | } | |
90 | ||
91 | static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin) | |
92 | { | |
93 | uint32_t cout = 0; | |
94 | ||
95 | if ((b == ~0) && cin) | |
96 | cout = 1; | |
97 | else if ((~0 - a) < (b + cin)) | |
98 | cout = 1; | |
99 | return cout; | |
100 | } | |
101 | ||
102 | uint32_t helper_cmp(uint32_t a, uint32_t b) | |
103 | { | |
104 | uint32_t t; | |
105 | ||
106 | t = b + ~a + 1; | |
107 | if ((b & 0x80000000) ^ (a & 0x80000000)) | |
108 | t = (t & 0x7fffffff) | (b & 0x80000000); | |
109 | return t; | |
110 | } | |
111 | ||
112 | uint32_t helper_cmpu(uint32_t a, uint32_t b) | |
113 | { | |
114 | uint32_t t; | |
115 | ||
116 | t = b + ~a + 1; | |
117 | if ((b & 0x80000000) ^ (a & 0x80000000)) | |
118 | t = (t & 0x7fffffff) | (a & 0x80000000); | |
119 | return t; | |
120 | } | |
121 | ||
122 | uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) | |
123 | { | |
124 | uint32_t d, cf = 0, ncf; | |
125 | ||
126 | if (c) | |
127 | cf = env->sregs[SR_MSR] >> 31; | |
128 | assert(cf == 0 || cf == 1); | |
129 | d = a + b + cf; | |
130 | ||
131 | if (!k) { | |
132 | ncf = compute_carry(a, b, cf); | |
133 | assert(ncf == 0 || ncf == 1); | |
134 | if (ncf) | |
135 | env->sregs[SR_MSR] |= MSR_C | MSR_CC; | |
136 | else | |
137 | env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); | |
138 | } | |
139 | D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n", | |
140 | d, a, b, cf, ncf, k, c)); | |
141 | return d; | |
142 | } | |
143 | ||
144 | uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) | |
145 | { | |
146 | uint32_t d, cf = 1, ncf; | |
147 | ||
148 | if (c) | |
149 | cf = env->sregs[SR_MSR] >> 31; | |
150 | assert(cf == 0 || cf == 1); | |
151 | d = b + ~a + cf; | |
152 | ||
153 | if (!k) { | |
154 | ncf = compute_carry(b, ~a, cf); | |
155 | assert(ncf == 0 || ncf == 1); | |
156 | if (ncf) | |
157 | env->sregs[SR_MSR] |= MSR_C | MSR_CC; | |
158 | else | |
159 | env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); | |
160 | } | |
161 | D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n", | |
162 | d, a, b, cf, ncf, k, c)); | |
163 | return d; | |
164 | } | |
165 | ||
166 | static inline int div_prepare(uint32_t a, uint32_t b) | |
167 | { | |
168 | if (b == 0) { | |
169 | env->sregs[SR_MSR] |= MSR_DZ; | |
821ebb33 EI |
170 | |
171 | if ((env->sregs[SR_MSR] & MSR_EE) | |
172 | && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) { | |
173 | env->sregs[SR_ESR] = ESR_EC_DIVZERO; | |
174 | helper_raise_exception(EXCP_HW_EXCP); | |
175 | } | |
4acb54ba EI |
176 | return 0; |
177 | } | |
178 | env->sregs[SR_MSR] &= ~MSR_DZ; | |
179 | return 1; | |
180 | } | |
181 | ||
182 | uint32_t helper_divs(uint32_t a, uint32_t b) | |
183 | { | |
184 | if (!div_prepare(a, b)) | |
185 | return 0; | |
186 | return (int32_t)a / (int32_t)b; | |
187 | } | |
188 | ||
189 | uint32_t helper_divu(uint32_t a, uint32_t b) | |
190 | { | |
191 | if (!div_prepare(a, b)) | |
192 | return 0; | |
193 | return a / b; | |
194 | } | |
195 | ||
196 | uint32_t helper_pcmpbf(uint32_t a, uint32_t b) | |
197 | { | |
198 | unsigned int i; | |
199 | uint32_t mask = 0xff000000; | |
200 | ||
201 | for (i = 0; i < 4; i++) { | |
202 | if ((a & mask) == (b & mask)) | |
203 | return i + 1; | |
204 | mask >>= 8; | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
3aa80988 | 209 | void helper_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask) |
968a40f6 | 210 | { |
968a40f6 | 211 | if (addr & mask) { |
97f90cbf EI |
212 | qemu_log_mask(CPU_LOG_INT, |
213 | "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n", | |
214 | addr, mask, wr, dr); | |
215 | env->sregs[SR_EAR] = addr; | |
968a40f6 EI |
216 | env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \ |
217 | | (dr & 31) << 5; | |
3aa80988 | 218 | if (mask == 3) { |
968a40f6 EI |
219 | env->sregs[SR_ESR] |= 1 << 11; |
220 | } | |
97f90cbf EI |
221 | if (!(env->sregs[SR_MSR] & MSR_EE)) { |
222 | return; | |
223 | } | |
968a40f6 EI |
224 | helper_raise_exception(EXCP_HW_EXCP); |
225 | } | |
226 | } | |
227 | ||
4acb54ba EI |
228 | #if !defined(CONFIG_USER_ONLY) |
229 | /* Writes/reads to the MMU's special regs end up here. */ | |
230 | uint32_t helper_mmu_read(uint32_t rn) | |
231 | { | |
232 | return mmu_read(env, rn); | |
233 | } | |
234 | ||
235 | void helper_mmu_write(uint32_t rn, uint32_t v) | |
236 | { | |
237 | mmu_write(env, rn, v); | |
238 | } | |
239 | #endif | |
faed1c2a | 240 | |
c227f099 | 241 | void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec, |
faed1c2a EI |
242 | int is_asi, int size) |
243 | { | |
244 | CPUState *saved_env; | |
245 | /* XXX: hack to restore env in all cases, even if not called from | |
246 | generated code */ | |
247 | saved_env = env; | |
248 | env = cpu_single_env; | |
97f90cbf | 249 | qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n", |
faed1c2a EI |
250 | addr, is_write, is_exec); |
251 | if (!(env->sregs[SR_MSR] & MSR_EE)) { | |
95b279de | 252 | env = saved_env; |
faed1c2a EI |
253 | return; |
254 | } | |
255 | ||
97f90cbf | 256 | env->sregs[SR_EAR] = addr; |
faed1c2a | 257 | if (is_exec) { |
97f90cbf | 258 | if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) { |
faed1c2a EI |
259 | env->sregs[SR_ESR] = ESR_EC_INSN_BUS; |
260 | helper_raise_exception(EXCP_HW_EXCP); | |
261 | } | |
262 | } else { | |
97f90cbf | 263 | if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) { |
faed1c2a EI |
264 | env->sregs[SR_ESR] = ESR_EC_DATA_BUS; |
265 | helper_raise_exception(EXCP_HW_EXCP); | |
266 | } | |
267 | } | |
95b279de | 268 | env = saved_env; |
faed1c2a | 269 | } |