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1.1 root 1: /*
2: * Microblaze helper routines.
3: *
4: * Copyright (c) 2009 Edgar E. Iglesias <[email protected]>.
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
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