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" 21 #include "qemu.h" 22 #include "user-internals.h" 23 #include "cpu_loop-common.h" 24 #include "signal-common.h" 25 26 #define SPARC64_STACK_BIAS 2047 27 28 //#define DEBUG_WIN 29 30 /* WARNING: dealing with register windows _is_ complicated. More info 31 can be found at http://www.sics.se/~psm/sparcstack.html */ 32 static inline int get_reg_index(CPUSPARCState *env, int cwp, int index) 33 { 34 index = (index + cwp * 16) % (16 * env->nwindows); 35 /* wrap handling : if cwp is on the last window, then we use the 36 registers 'after' the end */ 37 if (index < 8 && env->cwp == env->nwindows - 1) 38 index += 16 * env->nwindows; 39 return index; 40 } 41 42 /* save the register window 'cwp1' */ 43 static inline void save_window_offset(CPUSPARCState *env, int cwp1) 44 { 45 unsigned int i; 46 abi_ulong sp_ptr; 47 48 sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)]; 49 #ifdef TARGET_SPARC64 50 if (sp_ptr & 3) 51 sp_ptr += SPARC64_STACK_BIAS; 52 #endif 53 #if defined(DEBUG_WIN) 54 printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n", 55 sp_ptr, cwp1); 56 #endif 57 for(i = 0; i < 16; i++) { 58 /* FIXME - what to do if put_user() fails? */ 59 put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr); 60 sp_ptr += sizeof(abi_ulong); 61 } 62 } 63 64 static void save_window(CPUSPARCState *env) 65 { 66 #ifndef TARGET_SPARC64 67 unsigned int new_wim; 68 new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) & 69 ((1LL << env->nwindows) - 1); 70 save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2)); 71 env->wim = new_wim; 72 #else 73 /* 74 * cansave is zero if the spill trap handler is triggered by `save` and 75 * nonzero if triggered by a `flushw` 76 */ 77 save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2)); 78 env->cansave++; 79 env->canrestore--; 80 #endif 81 } 82 83 static void restore_window(CPUSPARCState *env) 84 { 85 #ifndef TARGET_SPARC64 86 unsigned int new_wim; 87 #endif 88 unsigned int i, cwp1; 89 abi_ulong sp_ptr; 90 91 #ifndef TARGET_SPARC64 92 new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) & 93 ((1LL << env->nwindows) - 1); 94 #endif 95 96 /* restore the invalid window */ 97 cwp1 = cpu_cwp_inc(env, env->cwp + 1); 98 sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)]; 99 #ifdef TARGET_SPARC64 100 if (sp_ptr & 3) 101 sp_ptr += SPARC64_STACK_BIAS; 102 #endif 103 #if defined(DEBUG_WIN) 104 printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n", 105 sp_ptr, cwp1); 106 #endif 107 for(i = 0; i < 16; i++) { 108 /* FIXME - what to do if get_user() fails? */ 109 get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr); 110 sp_ptr += sizeof(abi_ulong); 111 } 112 #ifdef TARGET_SPARC64 113 env->canrestore++; 114 if (env->cleanwin < env->nwindows - 1) 115 env->cleanwin++; 116 env->cansave--; 117 #else 118 env->wim = new_wim; 119 #endif 120 } 121 122 static void flush_windows(CPUSPARCState *env) 123 { 124 int offset, cwp1; 125 126 offset = 1; 127 for(;;) { 128 /* if restore would invoke restore_window(), then we can stop */ 129 cwp1 = cpu_cwp_inc(env, env->cwp + offset); 130 #ifndef TARGET_SPARC64 131 if (env->wim & (1 << cwp1)) 132 break; 133 #else 134 if (env->canrestore == 0) 135 break; 136 env->cansave++; 137 env->canrestore--; 138 #endif 139 save_window_offset(env, cwp1); 140 offset++; 141 } 142 cwp1 = cpu_cwp_inc(env, env->cwp + 1); 143 #ifndef TARGET_SPARC64 144 /* set wim so that restore will reload the registers */ 145 env->wim = 1 << cwp1; 146 #endif 147 #if defined(DEBUG_WIN) 148 printf("flush_windows: nb=%d\n", offset - 1); 149 #endif 150 } 151 152 /* Avoid ifdefs below for the abi32 and abi64 paths. */ 153 #ifdef TARGET_ABI32 154 #define TARGET_TT_SYSCALL (TT_TRAP + 0x10) /* t_linux */ 155 #define syscall_cc psr 156 #else 157 #define TARGET_TT_SYSCALL (TT_TRAP + 0x6d) /* tl0_linux64 */ 158 #define syscall_cc xcc 159 #endif 160 161 void cpu_loop (CPUSPARCState *env) 162 { 163 CPUState *cs = env_cpu(env); 164 int trapnr; 165 abi_long ret; 166 167 while (1) { 168 cpu_exec_start(cs); 169 trapnr = cpu_exec(cs); 170 cpu_exec_end(cs); 171 process_queued_cpu_work(cs); 172 173 /* Compute PSR before exposing state. */ 174 if (env->cc_op != CC_OP_FLAGS) { 175 cpu_get_psr(env); 176 } 177 178 switch (trapnr) { 179 case TARGET_TT_SYSCALL: 180 ret = do_syscall (env, env->gregs[1], 181 env->regwptr[0], env->regwptr[1], 182 env->regwptr[2], env->regwptr[3], 183 env->regwptr[4], env->regwptr[5], 184 0, 0); 185 if (ret == -QEMU_ERESTARTSYS || ret == -QEMU_ESIGRETURN) { 186 break; 187 } 188 if ((abi_ulong)ret >= (abi_ulong)(-515)) { 189 env->syscall_cc |= PSR_CARRY; 190 ret = -ret; 191 } else { 192 env->syscall_cc &= ~PSR_CARRY; 193 } 194 env->regwptr[0] = ret; 195 /* next instruction */ 196 env->pc = env->npc; 197 env->npc = env->npc + 4; 198 break; 199 case 0x83: /* flush windows */ 200 #ifdef TARGET_ABI32 201 case 0x103: 202 #endif 203 flush_windows(env); 204 /* next instruction */ 205 env->pc = env->npc; 206 env->npc = env->npc + 4; 207 break; 208 #ifndef TARGET_SPARC64 209 case TT_WIN_OVF: /* window overflow */ 210 save_window(env); 211 break; 212 case TT_WIN_UNF: /* window underflow */ 213 restore_window(env); 214 break; 215 #else 216 case TT_SPILL: /* window overflow */ 217 save_window(env); 218 break; 219 case TT_FILL: /* window underflow */ 220 restore_window(env); 221 break; 222 #ifndef TARGET_ABI32 223 case 0x16e: 224 flush_windows(env); 225 sparc64_get_context(env); 226 break; 227 case 0x16f: 228 flush_windows(env); 229 sparc64_set_context(env); 230 break; 231 #endif 232 #endif 233 case EXCP_INTERRUPT: 234 /* just indicate that signals should be handled asap */ 235 break; 236 case TT_ILL_INSN: 237 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc); 238 break; 239 case EXCP_DEBUG: 240 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 241 break; 242 case EXCP_ATOMIC: 243 cpu_exec_step_atomic(cs); 244 break; 245 default: 246 /* 247 * Most software trap numbers vector to BAD_TRAP. 248 * Handle anything not explicitly matched above. 249 */ 250 if (trapnr >= TT_TRAP && trapnr <= TT_TRAP + 0x7f) { 251 force_sig_fault(TARGET_SIGILL, ILL_ILLTRP, env->pc); 252 break; 253 } 254 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 255 cpu_dump_state(cs, stderr, 0); 256 exit(EXIT_FAILURE); 257 } 258 process_pending_signals (env); 259 } 260 } 261 262 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 263 { 264 int i; 265 env->pc = regs->pc; 266 env->npc = regs->npc; 267 env->y = regs->y; 268 for(i = 0; i < 8; i++) 269 env->gregs[i] = regs->u_regs[i]; 270 for(i = 0; i < 8; i++) 271 env->regwptr[i] = regs->u_regs[i + 8]; 272 } 273