target/i386/tcg/misc_helper.c

   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);
  45     if (eflags & CC_O) {
  46         raise_interrupt(env, EXCP04_INTO, 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 helper_pause(CPUX86State *env)
  92 {
  93     CPUState *cs = env_cpu(env);
  94
  95     /* Do gen_eob() tasks before going back to the main loop.  */
  96     do_end_instruction(env);
  97     helper_rechecking_single_step(env);
  98
  99     /* Just let another CPU run.  */
 100     cs->exception_index = EXCP_INTERRUPT;
 101     cpu_loop_exit(cs);
 102 }
 103
 104 uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx)
 105 {
 106     if ((env->cr[4] & CR4_PKE_MASK) == 0) {
 107         raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
 108     }
 109     if (ecx != 0) {
 110         raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
 111     }
 112
 113     return env->pkru;
 114 }
 115
 116 void helper_wrpkru(CPUX86State *env, uint32_t ecx, uint64_t val)
 117 {
 118     CPUState *cs = env_cpu(env);
 119
 120     if ((env->cr[4] & CR4_PKE_MASK) == 0) {
 121         raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
 122     }
 123     if (ecx != 0 || (val & 0xFFFFFFFF00000000ull)) {
 124         raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
 125     }
 126
 127     env->pkru = val;
 128     tlb_flush(cs);
 129 }
 130
 131 target_ulong HELPER(rdpid)(CPUX86State *env)
 132 {
 133 #if !defined CONFIG_USER_ONLY
 134     return env->tsc_aux;
 135 #elif defined CONFIG_LINUX && defined CONFIG_GETCPU
 136     unsigned cpu, node;
 137     getcpu(&cpu, &node);
 138     return (node << 12) | (cpu & 0xfff);
 139 #elif defined CONFIG_SCHED_GETCPU
 140     return sched_getcpu();
 141 #else
 142     return 0;
 143 #endif
 144 }