root / target-microblaze / op_helper.c @ a8a358bf
History | View | Annotate | Download (5.1 kB)
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
|
17 |
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
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; |
170 |
/* FIXME: Raise the div by zero exception. */
|
171 |
return 0; |
172 |
} |
173 |
env->sregs[SR_MSR] &= ~MSR_DZ; |
174 |
return 1; |
175 |
} |
176 |
|
177 |
uint32_t helper_divs(uint32_t a, uint32_t b) |
178 |
{ |
179 |
if (!div_prepare(a, b))
|
180 |
return 0; |
181 |
return (int32_t)a / (int32_t)b;
|
182 |
} |
183 |
|
184 |
uint32_t helper_divu(uint32_t a, uint32_t b) |
185 |
{ |
186 |
if (!div_prepare(a, b))
|
187 |
return 0; |
188 |
return a / b;
|
189 |
} |
190 |
|
191 |
uint32_t helper_pcmpbf(uint32_t a, uint32_t b) |
192 |
{ |
193 |
unsigned int i; |
194 |
uint32_t mask = 0xff000000;
|
195 |
|
196 |
for (i = 0; i < 4; i++) { |
197 |
if ((a & mask) == (b & mask))
|
198 |
return i + 1; |
199 |
mask >>= 8;
|
200 |
} |
201 |
return 0; |
202 |
} |
203 |
|
204 |
#if !defined(CONFIG_USER_ONLY)
|
205 |
/* Writes/reads to the MMU's special regs end up here. */
|
206 |
uint32_t helper_mmu_read(uint32_t rn) |
207 |
{ |
208 |
return mmu_read(env, rn);
|
209 |
} |
210 |
|
211 |
void helper_mmu_write(uint32_t rn, uint32_t v)
|
212 |
{ |
213 |
mmu_write(env, rn, v); |
214 |
} |
215 |
#endif
|