usb-mtp: fix alignment of access of ObjectInfo filename field
[qemu/ar7.git] / linux-user / tilegx / cpu_loop.c
blob4f39eb9ad3e5ac0f9528c8e29f238c8908eee721
1 /*
2 * qemu user cpu loop
4 * Copyright (c) 2003-2008 Fabrice Bellard
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.
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.
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/>.
20 #include "qemu/osdep.h"
21 #include "qemu.h"
22 #include "cpu_loop-common.h"
24 static void gen_sigill_reg(CPUTLGState *env)
26 target_siginfo_t info;
28 info.si_signo = TARGET_SIGILL;
29 info.si_errno = 0;
30 info.si_code = TARGET_ILL_PRVREG;
31 info._sifields._sigfault._addr = env->pc;
32 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
35 static void do_signal(CPUTLGState *env, int signo, int sigcode)
37 target_siginfo_t info;
39 info.si_signo = signo;
40 info.si_errno = 0;
41 info._sifields._sigfault._addr = env->pc;
43 if (signo == TARGET_SIGSEGV) {
44 /* The passed in sigcode is a dummy; check for a page mapping
45 and pass either MAPERR or ACCERR. */
46 target_ulong addr = env->excaddr;
47 info._sifields._sigfault._addr = addr;
48 if (page_check_range(addr, 1, PAGE_VALID) < 0) {
49 sigcode = TARGET_SEGV_MAPERR;
50 } else {
51 sigcode = TARGET_SEGV_ACCERR;
54 info.si_code = sigcode;
56 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
59 static void gen_sigsegv_maperr(CPUTLGState *env, target_ulong addr)
61 env->excaddr = addr;
62 do_signal(env, TARGET_SIGSEGV, 0);
65 static void set_regval(CPUTLGState *env, uint8_t reg, uint64_t val)
67 if (unlikely(reg >= TILEGX_R_COUNT)) {
68 switch (reg) {
69 case TILEGX_R_SN:
70 case TILEGX_R_ZERO:
71 return;
72 case TILEGX_R_IDN0:
73 case TILEGX_R_IDN1:
74 case TILEGX_R_UDN0:
75 case TILEGX_R_UDN1:
76 case TILEGX_R_UDN2:
77 case TILEGX_R_UDN3:
78 gen_sigill_reg(env);
79 return;
80 default:
81 g_assert_not_reached();
84 env->regs[reg] = val;
88 * Compare the 8-byte contents of the CmpValue SPR with the 8-byte value in
89 * memory at the address held in the first source register. If the values are
90 * not equal, then no memory operation is performed. If the values are equal,
91 * the 8-byte quantity from the second source register is written into memory
92 * at the address held in the first source register. In either case, the result
93 * of the instruction is the value read from memory. The compare and write to
94 * memory are atomic and thus can be used for synchronization purposes. This
95 * instruction only operates for addresses aligned to a 8-byte boundary.
96 * Unaligned memory access causes an Unaligned Data Reference interrupt.
98 * Functional Description (64-bit)
99 * uint64_t memVal = memoryReadDoubleWord (rf[SrcA]);
100 * rf[Dest] = memVal;
101 * if (memVal == SPR[CmpValueSPR])
102 * memoryWriteDoubleWord (rf[SrcA], rf[SrcB]);
104 * Functional Description (32-bit)
105 * uint64_t memVal = signExtend32 (memoryReadWord (rf[SrcA]));
106 * rf[Dest] = memVal;
107 * if (memVal == signExtend32 (SPR[CmpValueSPR]))
108 * memoryWriteWord (rf[SrcA], rf[SrcB]);
111 * This function also processes exch and exch4 which need not process SPR.
113 static void do_exch(CPUTLGState *env, bool quad, bool cmp)
115 target_ulong addr;
116 target_long val, sprval;
118 start_exclusive();
120 addr = env->atomic_srca;
121 if (quad ? get_user_s64(val, addr) : get_user_s32(val, addr)) {
122 goto sigsegv_maperr;
125 if (cmp) {
126 if (quad) {
127 sprval = env->spregs[TILEGX_SPR_CMPEXCH];
128 } else {
129 sprval = sextract64(env->spregs[TILEGX_SPR_CMPEXCH], 0, 32);
133 if (!cmp || val == sprval) {
134 target_long valb = env->atomic_srcb;
135 if (quad ? put_user_u64(valb, addr) : put_user_u32(valb, addr)) {
136 goto sigsegv_maperr;
140 set_regval(env, env->atomic_dstr, val);
141 end_exclusive();
142 return;
144 sigsegv_maperr:
145 end_exclusive();
146 gen_sigsegv_maperr(env, addr);
149 static void do_fetch(CPUTLGState *env, int trapnr, bool quad)
151 int8_t write = 1;
152 target_ulong addr;
153 target_long val, valb;
155 start_exclusive();
157 addr = env->atomic_srca;
158 valb = env->atomic_srcb;
159 if (quad ? get_user_s64(val, addr) : get_user_s32(val, addr)) {
160 goto sigsegv_maperr;
163 switch (trapnr) {
164 case TILEGX_EXCP_OPCODE_FETCHADD:
165 case TILEGX_EXCP_OPCODE_FETCHADD4:
166 valb += val;
167 break;
168 case TILEGX_EXCP_OPCODE_FETCHADDGEZ:
169 valb += val;
170 if (valb < 0) {
171 write = 0;
173 break;
174 case TILEGX_EXCP_OPCODE_FETCHADDGEZ4:
175 valb += val;
176 if ((int32_t)valb < 0) {
177 write = 0;
179 break;
180 case TILEGX_EXCP_OPCODE_FETCHAND:
181 case TILEGX_EXCP_OPCODE_FETCHAND4:
182 valb &= val;
183 break;
184 case TILEGX_EXCP_OPCODE_FETCHOR:
185 case TILEGX_EXCP_OPCODE_FETCHOR4:
186 valb |= val;
187 break;
188 default:
189 g_assert_not_reached();
192 if (write) {
193 if (quad ? put_user_u64(valb, addr) : put_user_u32(valb, addr)) {
194 goto sigsegv_maperr;
198 set_regval(env, env->atomic_dstr, val);
199 end_exclusive();
200 return;
202 sigsegv_maperr:
203 end_exclusive();
204 gen_sigsegv_maperr(env, addr);
207 void cpu_loop(CPUTLGState *env)
209 CPUState *cs = CPU(tilegx_env_get_cpu(env));
210 int trapnr;
212 while (1) {
213 cpu_exec_start(cs);
214 trapnr = cpu_exec(cs);
215 cpu_exec_end(cs);
216 process_queued_cpu_work(cs);
218 switch (trapnr) {
219 case TILEGX_EXCP_SYSCALL:
221 abi_ulong ret = do_syscall(env, env->regs[TILEGX_R_NR],
222 env->regs[0], env->regs[1],
223 env->regs[2], env->regs[3],
224 env->regs[4], env->regs[5],
225 env->regs[6], env->regs[7]);
226 if (ret == -TARGET_ERESTARTSYS) {
227 env->pc -= 8;
228 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
229 env->regs[TILEGX_R_RE] = ret;
230 env->regs[TILEGX_R_ERR] = TILEGX_IS_ERRNO(ret) ? -ret : 0;
232 break;
234 case TILEGX_EXCP_OPCODE_EXCH:
235 do_exch(env, true, false);
236 break;
237 case TILEGX_EXCP_OPCODE_EXCH4:
238 do_exch(env, false, false);
239 break;
240 case TILEGX_EXCP_OPCODE_CMPEXCH:
241 do_exch(env, true, true);
242 break;
243 case TILEGX_EXCP_OPCODE_CMPEXCH4:
244 do_exch(env, false, true);
245 break;
246 case TILEGX_EXCP_OPCODE_FETCHADD:
247 case TILEGX_EXCP_OPCODE_FETCHADDGEZ:
248 case TILEGX_EXCP_OPCODE_FETCHAND:
249 case TILEGX_EXCP_OPCODE_FETCHOR:
250 do_fetch(env, trapnr, true);
251 break;
252 case TILEGX_EXCP_OPCODE_FETCHADD4:
253 case TILEGX_EXCP_OPCODE_FETCHADDGEZ4:
254 case TILEGX_EXCP_OPCODE_FETCHAND4:
255 case TILEGX_EXCP_OPCODE_FETCHOR4:
256 do_fetch(env, trapnr, false);
257 break;
258 case TILEGX_EXCP_SIGNAL:
259 do_signal(env, env->signo, env->sigcode);
260 break;
261 case TILEGX_EXCP_REG_IDN_ACCESS:
262 case TILEGX_EXCP_REG_UDN_ACCESS:
263 gen_sigill_reg(env);
264 break;
265 case EXCP_ATOMIC:
266 cpu_exec_step_atomic(cs);
267 break;
268 default:
269 fprintf(stderr, "trapnr is %d[0x%x].\n", trapnr, trapnr);
270 g_assert_not_reached();
272 process_pending_signals(env);
276 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
278 int i;
279 for (i = 0; i < TILEGX_R_COUNT; i++) {
280 env->regs[i] = regs->regs[i];
282 for (i = 0; i < TILEGX_SPR_COUNT; i++) {
283 env->spregs[i] = 0;
285 env->pc = regs->pc;