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cd71c089 LV |
1 | /* |
2 | * qemu user cpu loop | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program 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 | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "qemu/osdep.h" | |
a8d25326 | 21 | #include "qemu-common.h" |
cd71c089 | 22 | #include "qemu.h" |
3b249d26 | 23 | #include "user-internals.h" |
cd71c089 | 24 | #include "cpu_loop-common.h" |
2113aed6 | 25 | #include "signal-common.h" |
cd71c089 | 26 | |
d0a28415 LV |
27 | #define SPARC64_STACK_BIAS 2047 |
28 | ||
29 | //#define DEBUG_WIN | |
30 | ||
31 | /* WARNING: dealing with register windows _is_ complicated. More info | |
32 | can be found at http://www.sics.se/~psm/sparcstack.html */ | |
33 | static inline int get_reg_index(CPUSPARCState *env, int cwp, int index) | |
34 | { | |
35 | index = (index + cwp * 16) % (16 * env->nwindows); | |
36 | /* wrap handling : if cwp is on the last window, then we use the | |
37 | registers 'after' the end */ | |
38 | if (index < 8 && env->cwp == env->nwindows - 1) | |
39 | index += 16 * env->nwindows; | |
40 | return index; | |
41 | } | |
42 | ||
43 | /* save the register window 'cwp1' */ | |
44 | static inline void save_window_offset(CPUSPARCState *env, int cwp1) | |
45 | { | |
46 | unsigned int i; | |
47 | abi_ulong sp_ptr; | |
48 | ||
49 | sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)]; | |
50 | #ifdef TARGET_SPARC64 | |
51 | if (sp_ptr & 3) | |
52 | sp_ptr += SPARC64_STACK_BIAS; | |
53 | #endif | |
54 | #if defined(DEBUG_WIN) | |
55 | printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n", | |
56 | sp_ptr, cwp1); | |
57 | #endif | |
58 | for(i = 0; i < 16; i++) { | |
59 | /* FIXME - what to do if put_user() fails? */ | |
60 | put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr); | |
61 | sp_ptr += sizeof(abi_ulong); | |
62 | } | |
63 | } | |
64 | ||
65 | static void save_window(CPUSPARCState *env) | |
66 | { | |
67 | #ifndef TARGET_SPARC64 | |
68 | unsigned int new_wim; | |
69 | new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) & | |
70 | ((1LL << env->nwindows) - 1); | |
71 | save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2)); | |
72 | env->wim = new_wim; | |
73 | #else | |
d43624c4 GM |
74 | /* |
75 | * cansave is zero if the spill trap handler is triggered by `save` and | |
76 | * nonzero if triggered by a `flushw` | |
77 | */ | |
78 | save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2)); | |
d0a28415 LV |
79 | env->cansave++; |
80 | env->canrestore--; | |
81 | #endif | |
82 | } | |
83 | ||
84 | static void restore_window(CPUSPARCState *env) | |
85 | { | |
86 | #ifndef TARGET_SPARC64 | |
87 | unsigned int new_wim; | |
88 | #endif | |
89 | unsigned int i, cwp1; | |
90 | abi_ulong sp_ptr; | |
91 | ||
92 | #ifndef TARGET_SPARC64 | |
93 | new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) & | |
94 | ((1LL << env->nwindows) - 1); | |
95 | #endif | |
96 | ||
97 | /* restore the invalid window */ | |
98 | cwp1 = cpu_cwp_inc(env, env->cwp + 1); | |
99 | sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)]; | |
100 | #ifdef TARGET_SPARC64 | |
101 | if (sp_ptr & 3) | |
102 | sp_ptr += SPARC64_STACK_BIAS; | |
103 | #endif | |
104 | #if defined(DEBUG_WIN) | |
105 | printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n", | |
106 | sp_ptr, cwp1); | |
107 | #endif | |
108 | for(i = 0; i < 16; i++) { | |
109 | /* FIXME - what to do if get_user() fails? */ | |
110 | get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr); | |
111 | sp_ptr += sizeof(abi_ulong); | |
112 | } | |
113 | #ifdef TARGET_SPARC64 | |
114 | env->canrestore++; | |
115 | if (env->cleanwin < env->nwindows - 1) | |
116 | env->cleanwin++; | |
117 | env->cansave--; | |
118 | #else | |
119 | env->wim = new_wim; | |
120 | #endif | |
121 | } | |
122 | ||
123 | static void flush_windows(CPUSPARCState *env) | |
124 | { | |
125 | int offset, cwp1; | |
126 | ||
127 | offset = 1; | |
128 | for(;;) { | |
129 | /* if restore would invoke restore_window(), then we can stop */ | |
130 | cwp1 = cpu_cwp_inc(env, env->cwp + offset); | |
131 | #ifndef TARGET_SPARC64 | |
132 | if (env->wim & (1 << cwp1)) | |
133 | break; | |
134 | #else | |
135 | if (env->canrestore == 0) | |
136 | break; | |
137 | env->cansave++; | |
138 | env->canrestore--; | |
139 | #endif | |
140 | save_window_offset(env, cwp1); | |
141 | offset++; | |
142 | } | |
143 | cwp1 = cpu_cwp_inc(env, env->cwp + 1); | |
144 | #ifndef TARGET_SPARC64 | |
145 | /* set wim so that restore will reload the registers */ | |
146 | env->wim = 1 << cwp1; | |
147 | #endif | |
148 | #if defined(DEBUG_WIN) | |
149 | printf("flush_windows: nb=%d\n", offset - 1); | |
150 | #endif | |
151 | } | |
152 | ||
153 | void cpu_loop (CPUSPARCState *env) | |
154 | { | |
5a59fbce | 155 | CPUState *cs = env_cpu(env); |
d0a28415 LV |
156 | int trapnr; |
157 | abi_long ret; | |
158 | target_siginfo_t info; | |
159 | ||
160 | while (1) { | |
161 | cpu_exec_start(cs); | |
162 | trapnr = cpu_exec(cs); | |
163 | cpu_exec_end(cs); | |
164 | process_queued_cpu_work(cs); | |
165 | ||
166 | /* Compute PSR before exposing state. */ | |
167 | if (env->cc_op != CC_OP_FLAGS) { | |
168 | cpu_get_psr(env); | |
169 | } | |
170 | ||
171 | switch (trapnr) { | |
172 | #ifndef TARGET_SPARC64 | |
173 | case 0x88: | |
174 | case 0x90: | |
175 | #else | |
176 | case 0x110: | |
177 | case 0x16d: | |
178 | #endif | |
179 | ret = do_syscall (env, env->gregs[1], | |
180 | env->regwptr[0], env->regwptr[1], | |
181 | env->regwptr[2], env->regwptr[3], | |
182 | env->regwptr[4], env->regwptr[5], | |
183 | 0, 0); | |
57a0c938 | 184 | if (ret == -QEMU_ERESTARTSYS || ret == -QEMU_ESIGRETURN) { |
d0a28415 LV |
185 | break; |
186 | } | |
187 | if ((abi_ulong)ret >= (abi_ulong)(-515)) { | |
188 | #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32) | |
189 | env->xcc |= PSR_CARRY; | |
190 | #else | |
191 | env->psr |= PSR_CARRY; | |
192 | #endif | |
193 | ret = -ret; | |
194 | } else { | |
195 | #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32) | |
196 | env->xcc &= ~PSR_CARRY; | |
197 | #else | |
198 | env->psr &= ~PSR_CARRY; | |
199 | #endif | |
200 | } | |
201 | env->regwptr[0] = ret; | |
202 | /* next instruction */ | |
203 | env->pc = env->npc; | |
204 | env->npc = env->npc + 4; | |
205 | break; | |
206 | case 0x83: /* flush windows */ | |
207 | #ifdef TARGET_ABI32 | |
208 | case 0x103: | |
209 | #endif | |
210 | flush_windows(env); | |
211 | /* next instruction */ | |
212 | env->pc = env->npc; | |
213 | env->npc = env->npc + 4; | |
214 | break; | |
215 | #ifndef TARGET_SPARC64 | |
216 | case TT_WIN_OVF: /* window overflow */ | |
217 | save_window(env); | |
218 | break; | |
219 | case TT_WIN_UNF: /* window underflow */ | |
220 | restore_window(env); | |
221 | break; | |
d0a28415 LV |
222 | #else |
223 | case TT_SPILL: /* window overflow */ | |
224 | save_window(env); | |
225 | break; | |
226 | case TT_FILL: /* window underflow */ | |
227 | restore_window(env); | |
228 | break; | |
d0a28415 LV |
229 | #ifndef TARGET_ABI32 |
230 | case 0x16e: | |
231 | flush_windows(env); | |
232 | sparc64_get_context(env); | |
233 | break; | |
234 | case 0x16f: | |
235 | flush_windows(env); | |
236 | sparc64_set_context(env); | |
237 | break; | |
238 | #endif | |
239 | #endif | |
240 | case EXCP_INTERRUPT: | |
241 | /* just indicate that signals should be handled asap */ | |
242 | break; | |
243 | case TT_ILL_INSN: | |
244 | { | |
245 | info.si_signo = TARGET_SIGILL; | |
246 | info.si_errno = 0; | |
247 | info.si_code = TARGET_ILL_ILLOPC; | |
248 | info._sifields._sigfault._addr = env->pc; | |
249 | queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); | |
250 | } | |
251 | break; | |
252 | case EXCP_DEBUG: | |
b10089a1 PM |
253 | info.si_signo = TARGET_SIGTRAP; |
254 | info.si_errno = 0; | |
255 | info.si_code = TARGET_TRAP_BRKPT; | |
256 | queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); | |
d0a28415 LV |
257 | break; |
258 | case EXCP_ATOMIC: | |
259 | cpu_exec_step_atomic(cs); | |
260 | break; | |
261 | default: | |
84ca4fa9 | 262 | fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); |
90c84c56 | 263 | cpu_dump_state(cs, stderr, 0); |
d0a28415 LV |
264 | exit(EXIT_FAILURE); |
265 | } | |
266 | process_pending_signals (env); | |
267 | } | |
268 | } | |
269 | ||
cd71c089 LV |
270 | void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) |
271 | { | |
d0a28415 LV |
272 | int i; |
273 | env->pc = regs->pc; | |
274 | env->npc = regs->npc; | |
275 | env->y = regs->y; | |
276 | for(i = 0; i < 8; i++) | |
277 | env->gregs[i] = regs->u_regs[i]; | |
278 | for(i = 0; i < 8; i++) | |
279 | env->regwptr[i] = regs->u_regs[i + 8]; | |
cd71c089 | 280 | } |