1 /* 2 * x86 misc helpers 3 * 4 * Copyright (c) 2003 Fabrice Bellard 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 2.1 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 "qemu/osdep.h" 21 #include "qemu/log.h" 22 #include "cpu.h" 23 #include "exec/helper-proto.h" 24 #include "exec/exec-all.h" 25 #include "helper-tcg.h" 26 27 /* 28 * NOTE: the translator must set DisasContext.cc_op to CC_OP_EFLAGS 29 * after generating a call to a helper that uses this. 30 */ 31 void cpu_load_eflags(CPUX86State *env, int eflags, int update_mask) 32 { 33 CC_SRC = eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); 34 CC_OP = CC_OP_EFLAGS; 35 env->df = 1 - (2 * ((eflags >> 10) & 1)); 36 env->eflags = (env->eflags & ~update_mask) | 37 (eflags & update_mask) | 0x2; 38 } 39 40 void helper_into(CPUX86State *env, int next_eip_addend) 41 { 42 int eflags; 43 44 eflags = cpu_cc_compute_all(env, CC_OP); 45 if (eflags & CC_O) { 46 raise_interrupt(env, EXCP04_INTO, 1, 0, next_eip_addend); 47 } 48 } 49 50 void helper_cpuid(CPUX86State *env) 51 { 52 uint32_t eax, ebx, ecx, edx; 53 54 cpu_svm_check_intercept_param(env, SVM_EXIT_CPUID, 0, GETPC()); 55 56 cpu_x86_cpuid(env, (uint32_t)env->regs[R_EAX], (uint32_t)env->regs[R_ECX], 57 &eax, &ebx, &ecx, &edx); 58 env->regs[R_EAX] = eax; 59 env->regs[R_EBX] = ebx; 60 env->regs[R_ECX] = ecx; 61 env->regs[R_EDX] = edx; 62 } 63 64 void helper_rdtsc(CPUX86State *env) 65 { 66 uint64_t val; 67 68 if ((env->cr[4] & CR4_TSD_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) { 69 raise_exception_ra(env, EXCP0D_GPF, GETPC()); 70 } 71 cpu_svm_check_intercept_param(env, SVM_EXIT_RDTSC, 0, GETPC()); 72 73 val = cpu_get_tsc(env) + env->tsc_offset; 74 env->regs[R_EAX] = (uint32_t)(val); 75 env->regs[R_EDX] = (uint32_t)(val >> 32); 76 } 77 78 G_NORETURN void helper_rdpmc(CPUX86State *env) 79 { 80 if (((env->cr[4] & CR4_PCE_MASK) == 0 ) && 81 ((env->hflags & HF_CPL_MASK) != 0)) { 82 raise_exception_ra(env, EXCP0D_GPF, GETPC()); 83 } 84 cpu_svm_check_intercept_param(env, SVM_EXIT_RDPMC, 0, GETPC()); 85 86 /* currently unimplemented */ 87 qemu_log_mask(LOG_UNIMP, "x86: unimplemented rdpmc\n"); 88 raise_exception_err(env, EXCP06_ILLOP, 0); 89 } 90 91 G_NORETURN void do_pause(CPUX86State *env) 92 { 93 CPUState *cs = env_cpu(env); 94 95 /* Just let another CPU run. */ 96 cs->exception_index = EXCP_INTERRUPT; 97 cpu_loop_exit(cs); 98 } 99 100 G_NORETURN void helper_pause(CPUX86State *env, int next_eip_addend) 101 { 102 cpu_svm_check_intercept_param(env, SVM_EXIT_PAUSE, 0, GETPC()); 103 env->eip += next_eip_addend; 104 105 do_pause(env); 106 } 107 108 uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx) 109 { 110 if ((env->cr[4] & CR4_PKE_MASK) == 0) { 111 raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC()); 112 } 113 if (ecx != 0) { 114 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 115 } 116 117 return env->pkru; 118 } 119 120 void helper_wrpkru(CPUX86State *env, uint32_t ecx, uint64_t val) 121 { 122 CPUState *cs = env_cpu(env); 123 124 if ((env->cr[4] & CR4_PKE_MASK) == 0) { 125 raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC()); 126 } 127 if (ecx != 0 || (val & 0xFFFFFFFF00000000ull)) { 128 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 129 } 130 131 env->pkru = val; 132 tlb_flush(cs); 133 } 134 135 target_ulong HELPER(rdpid)(CPUX86State *env) 136 { 137 #if !defined CONFIG_USER_ONLY 138 return env->tsc_aux; 139 #elif defined CONFIG_LINUX && defined CONFIG_GETCPU 140 unsigned cpu, node; 141 getcpu(&cpu, &node); 142 return (node << 12) | (cpu & 0xfff); 143 #elif defined CONFIG_SCHED_GETCPU 144 return sched_getcpu(); 145 #else 146 return 0; 147 #endif 148 } 149