bsd-user/x86_64/target_arch_cpu.h

   1 /*
   2  *  x86_64 cpu init and loop
   3  *
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef _TARGET_ARCH_CPU_H_
  20 #define _TARGET_ARCH_CPU_H_
  21
  22 #include "target_arch.h"
  23
  24 #define TARGET_DEFAULT_CPU_MODEL "qemu64"
  25
  26 #define TARGET_CPU_RESET(cpu)
  27
  28 static inline void target_cpu_init(CPUX86State *env,
  29         struct target_pt_regs *regs)
  30 {
  31     uint64_t *gdt_table;
  32
  33     env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
  34     env->hflags |= HF_PE_MASK | HF_CPL_MASK;
  35     if (env->features[FEAT_1_EDX] & CPUID_SSE) {
  36         env->cr[4] |= CR4_OSFXSR_MASK;
  37         env->hflags |= HF_OSFXSR_MASK;
  38     }
  39
  40     /* enable 64 bit mode if possible */
  41     if (!(env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM)) {
  42         fprintf(stderr, "The selected x86 CPU does not support 64 bit mode\n");
  43         exit(1);
  44     }
  45     env->cr[4] |= CR4_PAE_MASK;
  46     env->efer |= MSR_EFER_LMA | MSR_EFER_LME;
  47     env->hflags |= HF_LMA_MASK;
  48
  49     /* flags setup : we activate the IRQs by default as in user mode */
  50     env->eflags |= IF_MASK;
  51
  52     /* register setup */
  53     env->regs[R_EAX] = regs->rax;
  54     env->regs[R_EBX] = regs->rbx;
  55     env->regs[R_ECX] = regs->rcx;
  56     env->regs[R_EDX] = regs->rdx;
  57     env->regs[R_ESI] = regs->rsi;
  58     env->regs[R_EDI] = regs->rdi;
  59     env->regs[R_EBP] = regs->rbp;
  60     env->regs[R_ESP] = regs->rsp;
  61     env->eip = regs->rip;
  62
  63     /* interrupt setup */
  64     env->idt.limit = 511;
  65
  66     env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
  67         PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  68     bsd_x86_64_set_idt_base(env->idt.base);
  69     bsd_x86_64_set_idt(0, 0);
  70     bsd_x86_64_set_idt(1, 0);
  71     bsd_x86_64_set_idt(2, 0);
  72     bsd_x86_64_set_idt(3, 3);
  73     bsd_x86_64_set_idt(4, 3);
  74     bsd_x86_64_set_idt(5, 0);
  75     bsd_x86_64_set_idt(6, 0);
  76     bsd_x86_64_set_idt(7, 0);
  77     bsd_x86_64_set_idt(8, 0);
  78     bsd_x86_64_set_idt(9, 0);
  79     bsd_x86_64_set_idt(10, 0);
  80     bsd_x86_64_set_idt(11, 0);
  81     bsd_x86_64_set_idt(12, 0);
  82     bsd_x86_64_set_idt(13, 0);
  83     bsd_x86_64_set_idt(14, 0);
  84     bsd_x86_64_set_idt(15, 0);
  85     bsd_x86_64_set_idt(16, 0);
  86     bsd_x86_64_set_idt(17, 0);
  87     bsd_x86_64_set_idt(18, 0);
  88     bsd_x86_64_set_idt(19, 0);
  89     bsd_x86_64_set_idt(0x80, 3);
  90
  91     /* segment setup */
  92     env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
  93             PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  94     env->gdt.limit = sizeof(uint64_t) * TARGET_GDT_ENTRIES - 1;
  95     gdt_table = g2h_untagged(env->gdt.base);
  96
  97     /* 64 bit code segment */
  98     bsd_x86_64_write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
  99             DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | DESC_L_MASK
 100             | (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
 101
 102     bsd_x86_64_write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
 103             DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
 104             (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
 105
 106     cpu_x86_load_seg(env, R_CS, __USER_CS);
 107     cpu_x86_load_seg(env, R_SS, __USER_DS);
 108     cpu_x86_load_seg(env, R_DS, 0);
 109     cpu_x86_load_seg(env, R_ES, 0);
 110     cpu_x86_load_seg(env, R_FS, 0);
 111     cpu_x86_load_seg(env, R_GS, 0);
 112 }
 113
 114 static inline void target_cpu_loop(CPUX86State *env)
 115 {
 116     CPUState *cs = env_cpu(env);
 117     int trapnr;
 118     abi_ulong pc;
 119     /* target_siginfo_t info; */
 120
 121     for (;;) {
 122         cpu_exec_start(cs);
 123         trapnr = cpu_exec(cs);
 124         cpu_exec_end(cs);
 125         process_queued_cpu_work(cs);
 126
 127         switch (trapnr) {
 128         case 0x80:
 129             /* syscall from int $0x80 */
 130             if (bsd_type == target_freebsd) {
 131                 abi_ulong params = (abi_ulong) env->regs[R_ESP] +
 132                     sizeof(int32_t);
 133                 int32_t syscall_nr = env->regs[R_EAX];
 134                 int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;
 135
 136                 if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
 137                     get_user_s32(syscall_nr, params);
 138                     params += sizeof(int32_t);
 139                 } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
 140                     get_user_s32(syscall_nr, params);
 141                     params += sizeof(int64_t);
 142                 }
 143                 get_user_s32(arg1, params);
 144                 params += sizeof(int32_t);
 145                 get_user_s32(arg2, params);
 146                 params += sizeof(int32_t);
 147                 get_user_s32(arg3, params);
 148                 params += sizeof(int32_t);
 149                 get_user_s32(arg4, params);
 150                 params += sizeof(int32_t);
 151                 get_user_s32(arg5, params);
 152                 params += sizeof(int32_t);
 153                 get_user_s32(arg6, params);
 154                 params += sizeof(int32_t);
 155                 get_user_s32(arg7, params);
 156                 params += sizeof(int32_t);
 157                 get_user_s32(arg8, params);
 158                 env->regs[R_EAX] = do_freebsd_syscall(env,
 159                                                       syscall_nr,
 160                                                       arg1,
 161                                                       arg2,
 162                                                       arg3,
 163                                                       arg4,
 164                                                       arg5,
 165                                                       arg6,
 166                                                       arg7,
 167                                                       arg8);
 168             } else { /* if (bsd_type == target_openbsd) */
 169                 env->regs[R_EAX] = do_openbsd_syscall(env,
 170                                                       env->regs[R_EAX],
 171                                                       env->regs[R_EBX],
 172                                                       env->regs[R_ECX],
 173                                                       env->regs[R_EDX],
 174                                                       env->regs[R_ESI],
 175                                                       env->regs[R_EDI],
 176                                                       env->regs[R_EBP]);
 177             }
 178             if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
 179                 env->regs[R_EAX] = -env->regs[R_EAX];
 180                 env->eflags |= CC_C;
 181             } else {
 182                 env->eflags &= ~CC_C;
 183             }
 184             break;
 185
 186         case EXCP_SYSCALL:
 187             /* syscall from syscall instruction */
 188             if (bsd_type == target_freebsd) {
 189                 env->regs[R_EAX] = do_freebsd_syscall(env,
 190                                                       env->regs[R_EAX],
 191                                                       env->regs[R_EDI],
 192                                                       env->regs[R_ESI],
 193                                                       env->regs[R_EDX],
 194                                                       env->regs[R_ECX],
 195                                                       env->regs[8],
 196                                                       env->regs[9], 0, 0);
 197             } else { /* if (bsd_type == target_openbsd) */
 198                 env->regs[R_EAX] = do_openbsd_syscall(env,
 199                                                       env->regs[R_EAX],
 200                                                       env->regs[R_EDI],
 201                                                       env->regs[R_ESI],
 202                                                       env->regs[R_EDX],
 203                                                       env->regs[10],
 204                                                       env->regs[8],
 205                                                       env->regs[9]);
 206             }
 207             env->eip = env->exception_next_eip;
 208             if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
 209                 env->regs[R_EAX] = -env->regs[R_EAX];
 210                 env->eflags |= CC_C;
 211             } else {
 212                 env->eflags &= ~CC_C;
 213             }
 214             break;
 215
 216         case EXCP_INTERRUPT:
 217             /* just indicate that signals should be handled asap */
 218             break;
 219
 220         case EXCP_ATOMIC:
 221             cpu_exec_step_atomic(cs);
 222             break;
 223
 224         default:
 225             pc = env->segs[R_CS].base + env->eip;
 226             fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - "
 227                     "aborting\n", (long)pc, trapnr);
 228             abort();
 229         }
 230         process_pending_signals(env);
 231     }
 232 }
 233
 234 static inline void target_cpu_clone_regs(CPUX86State *env, target_ulong newsp)
 235 {
 236     if (newsp) {
 237         env->regs[R_ESP] = newsp;
 238     }
 239     env->regs[R_EAX] = 0;
 240 }
 241
 242 static inline void target_cpu_reset(CPUArchState *cpu)
 243 {
 244     cpu_reset(env_cpu(cpu));
 245 }
 246
 247 #endif /* ! _TARGET_ARCH_CPU_H_ */