qemu

FORK: QEMU emulator
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misc_helper.c (3878B)

      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 void helper_rdtscp(CPUX86State *env)
     79 {
     80     helper_rdtsc(env);
     81     env->regs[R_ECX] = (uint32_t)(env->tsc_aux);
     82 }
     83 
     84 G_NORETURN void helper_rdpmc(CPUX86State *env)
     85 {
     86     if (((env->cr[4] & CR4_PCE_MASK) == 0 ) &&
     87         ((env->hflags & HF_CPL_MASK) != 0)) {
     88         raise_exception_ra(env, EXCP0D_GPF, GETPC());
     89     }
     90     cpu_svm_check_intercept_param(env, SVM_EXIT_RDPMC, 0, GETPC());
     91 
     92     /* currently unimplemented */
     93     qemu_log_mask(LOG_UNIMP, "x86: unimplemented rdpmc\n");
     94     raise_exception_err(env, EXCP06_ILLOP, 0);
     95 }
     96 
     97 G_NORETURN void do_pause(CPUX86State *env)
     98 {
     99     CPUState *cs = env_cpu(env);
    100 
    101     /* Just let another CPU run.  */
    102     cs->exception_index = EXCP_INTERRUPT;
    103     cpu_loop_exit(cs);
    104 }
    105 
    106 G_NORETURN void helper_pause(CPUX86State *env, int next_eip_addend)
    107 {
    108     cpu_svm_check_intercept_param(env, SVM_EXIT_PAUSE, 0, GETPC());
    109     env->eip += next_eip_addend;
    110 
    111     do_pause(env);
    112 }
    113 
    114 uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx)
    115 {
    116     if ((env->cr[4] & CR4_PKE_MASK) == 0) {
    117         raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
    118     }
    119     if (ecx != 0) {
    120         raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
    121     }
    122 
    123     return env->pkru;
    124 }
    125 
    126 void helper_wrpkru(CPUX86State *env, uint32_t ecx, uint64_t val)
    127 {
    128     CPUState *cs = env_cpu(env);
    129 
    130     if ((env->cr[4] & CR4_PKE_MASK) == 0) {
    131         raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
    132     }
    133     if (ecx != 0 || (val & 0xFFFFFFFF00000000ull)) {
    134         raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
    135     }
    136 
    137     env->pkru = val;
    138     tlb_flush(cs);
    139 }