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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2014 Lemote Corporation. * written by Huacai Chen <chenhc@lemote.com> * * based on arch/mips/cavium-octeon/cpu.c * Copyright (C) 2009 Wind River Systems, * written by Ralf Baechle <ralf@linux-mips.org> */ #include <linux/init.h> #include <linux/sched.h> #include <linux/notifier.h> #include <linux/ptrace.h> #include <linux/uaccess.h> #include <linux/sched/signal.h> #include <asm/fpu.h> #include <asm/cop2.h> #include <asm/inst.h> #include <asm/branch.h> #include <asm/current.h> #include <asm/mipsregs.h> #include <asm/unaligned-emul.h> static int loongson_cu2_call(struct notifier_block *nfb, unsigned long action, void *data) { unsigned int res, fpu_owned; unsigned long ra, value, value_next; union mips_instruction insn; int fr = !test_thread_flag(TIF_32BIT_FPREGS); struct pt_regs *regs = (struct pt_regs *)data; void __user *addr = (void __user *)regs->cp0_badvaddr; unsigned int __user *pc = (unsigned int __user *)exception_epc(regs); ra = regs->regs[31]; __get_user(insn.word, pc); switch (action) { case CU2_EXCEPTION: preempt_disable(); fpu_owned = __is_fpu_owner(); if (!fr) set_c0_status(ST0_CU1 | ST0_CU2); else set_c0_status(ST0_CU1 | ST0_CU2 | ST0_FR); enable_fpu_hazard(); KSTK_STATUS(current) |= (ST0_CU1 | ST0_CU2); if (fr) KSTK_STATUS(current) |= ST0_FR; else KSTK_STATUS(current) &= ~ST0_FR; /* If FPU is owned, we needn't init or restore fp */ if (!fpu_owned) { set_thread_flag(TIF_USEDFPU); init_fp_ctx(current); _restore_fp(current); } preempt_enable(); return NOTIFY_STOP; /* Don't call default notifier */ case CU2_LWC2_OP: if (insn.loongson3_lswc2_format.ls == 0) goto sigbus; if (insn.loongson3_lswc2_format.fr == 0) { /* gslq */ if (!access_ok(addr, 16)) goto sigbus; LoadDW(addr, value, res); if (res) goto fault; LoadDW(addr + 8, value_next, res); if (res) goto fault; regs->regs[insn.loongson3_lswc2_format.rt] = value; regs->regs[insn.loongson3_lswc2_format.rq] = value_next; compute_return_epc(regs); } else { /* gslqc1 */ if (!access_ok(addr, 16)) goto sigbus; lose_fpu(1); LoadDW(addr, value, res); if (res) goto fault; LoadDW(addr + 8, value_next, res); if (res) goto fault; set_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lswc2_format.rt], 0, value); set_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lswc2_format.rq], 0, value_next); compute_return_epc(regs); own_fpu(1); } return NOTIFY_STOP; /* Don't call default notifier */ case CU2_SWC2_OP: if (insn.loongson3_lswc2_format.ls == 0) goto sigbus; if (insn.loongson3_lswc2_format.fr == 0) { /* gssq */ if (!access_ok(addr, 16)) goto sigbus; /* write upper 8 bytes first */ value_next = regs->regs[insn.loongson3_lswc2_format.rq]; StoreDW(addr + 8, value_next, res); if (res) goto fault; value = regs->regs[insn.loongson3_lswc2_format.rt]; StoreDW(addr, value, res); if (res) goto fault; compute_return_epc(regs); } else { /* gssqc1 */ if (!access_ok(addr, 16)) goto sigbus; lose_fpu(1); value_next = get_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lswc2_format.rq], 0); StoreDW(addr + 8, value_next, res); if (res) goto fault; value = get_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lswc2_format.rt], 0); StoreDW(addr, value, res); if (res) goto fault; compute_return_epc(regs); own_fpu(1); } return NOTIFY_STOP; /* Don't call default notifier */ case CU2_LDC2_OP: switch (insn.loongson3_lsdc2_format.opcode1) { /* * Loongson-3 overridden ldc2 instructions. * opcode1 instruction * 0x1 gslhx: load 2 bytes to GPR * 0x2 gslwx: load 4 bytes to GPR * 0x3 gsldx: load 8 bytes to GPR * 0x6 gslwxc1: load 4 bytes to FPR * 0x7 gsldxc1: load 8 bytes to FPR */ case 0x1: if (!access_ok(addr, 2)) goto sigbus; LoadHW(addr, value, res); if (res) goto fault; compute_return_epc(regs); regs->regs[insn.loongson3_lsdc2_format.rt] = value; break; case 0x2: if (!access_ok(addr, 4)) goto sigbus; LoadW(addr, value, res); if (res) goto fault; compute_return_epc(regs); regs->regs[insn.loongson3_lsdc2_format.rt] = value; break; case 0x3: if (!access_ok(addr, 8)) goto sigbus; LoadDW(addr, value, res); if (res) goto fault; compute_return_epc(regs); regs->regs[insn.loongson3_lsdc2_format.rt] = value; break; case 0x6: die_if_kernel("Unaligned FP access in kernel code", regs); BUG_ON(!used_math()); if (!access_ok(addr, 4)) goto sigbus; lose_fpu(1); LoadW(addr, value, res); if (res) goto fault; set_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lsdc2_format.rt], 0, value); compute_return_epc(regs); own_fpu(1); break; case 0x7: die_if_kernel("Unaligned FP access in kernel code", regs); BUG_ON(!used_math()); if (!access_ok(addr, 8)) goto sigbus; lose_fpu(1); LoadDW(addr, value, res); if (res) goto fault; set_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lsdc2_format.rt], 0, value); compute_return_epc(regs); own_fpu(1); break; } return NOTIFY_STOP; /* Don't call default notifier */ case CU2_SDC2_OP: switch (insn.loongson3_lsdc2_format.opcode1) { /* * Loongson-3 overridden sdc2 instructions. * opcode1 instruction * 0x1 gsshx: store 2 bytes from GPR * 0x2 gsswx: store 4 bytes from GPR * 0x3 gssdx: store 8 bytes from GPR * 0x6 gsswxc1: store 4 bytes from FPR * 0x7 gssdxc1: store 8 bytes from FPR */ case 0x1: if (!access_ok(addr, 2)) goto sigbus; compute_return_epc(regs); value = regs->regs[insn.loongson3_lsdc2_format.rt]; StoreHW(addr, value, res); if (res) goto fault; break; case 0x2: if (!access_ok(addr, 4)) goto sigbus; compute_return_epc(regs); value = regs->regs[insn.loongson3_lsdc2_format.rt]; StoreW(addr, value, res); if (res) goto fault; break; case 0x3: if (!access_ok(addr, 8)) goto sigbus; compute_return_epc(regs); value = regs->regs[insn.loongson3_lsdc2_format.rt]; StoreDW(addr, value, res); if (res) goto fault; break; case 0x6: die_if_kernel("Unaligned FP access in kernel code", regs); BUG_ON(!used_math()); if (!access_ok(addr, 4)) goto sigbus; lose_fpu(1); value = get_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lsdc2_format.rt], 0); StoreW(addr, value, res); if (res) goto fault; compute_return_epc(regs); own_fpu(1); break; case 0x7: die_if_kernel("Unaligned FP access in kernel code", regs); BUG_ON(!used_math()); if (!access_ok(addr, 8)) goto sigbus; lose_fpu(1); value = get_fpr64(¤t->thread.fpu.fpr[insn.loongson3_lsdc2_format.rt], 0); StoreDW(addr, value, res); if (res) goto fault; compute_return_epc(regs); own_fpu(1); break; } return NOTIFY_STOP; /* Don't call default notifier */ } return NOTIFY_OK; /* Let default notifier send signals */ fault: /* roll back jump/branch */ regs->regs[31] = ra; regs->cp0_epc = (unsigned long)pc; /* Did we have an exception handler installed? */ if (fixup_exception(regs)) return NOTIFY_STOP; /* Don't call default notifier */ die_if_kernel("Unhandled kernel unaligned access", regs); force_sig(SIGSEGV); return NOTIFY_STOP; /* Don't call default notifier */ sigbus: die_if_kernel("Unhandled kernel unaligned access", regs); force_sig(SIGBUS); return NOTIFY_STOP; /* Don't call default notifier */ } static int __init loongson_cu2_setup(void) { return cu2_notifier(loongson_cu2_call, 0); } early_initcall(loongson_cu2_setup); |