bsd-user/i386/target_arch_cpu.h

   1 /*
   2  *  i386 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 "qemu32"
  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     /* flags setup : we activate the IRQs by default as in user mode */
  41     env->eflags |= IF_MASK;
  42
  43     /* register setup */
  44     env->regs[R_EAX] = regs->eax;
  45     env->regs[R_EBX] = regs->ebx;
  46     env->regs[R_ECX] = regs->ecx;
  47     env->regs[R_EDX] = regs->edx;
  48     env->regs[R_ESI] = regs->esi;
  49     env->regs[R_EDI] = regs->edi;
  50     env->regs[R_EBP] = regs->ebp;
  51     env->regs[R_ESP] = regs->esp;
  52     env->eip = regs->eip;
  53
  54     /* interrupt setup */
  55     env->idt.limit = 255;
  56
  57     env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
  58         PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  59     bsd_i386_set_idt_base(env->idt.base);
  60     bsd_i386_set_idt(0, 0);
  61     bsd_i386_set_idt(1, 0);
  62     bsd_i386_set_idt(2, 0);
  63     bsd_i386_set_idt(3, 3);
  64     bsd_i386_set_idt(4, 3);
  65     bsd_i386_set_idt(5, 0);
  66     bsd_i386_set_idt(6, 0);
  67     bsd_i386_set_idt(7, 0);
  68     bsd_i386_set_idt(8, 0);
  69     bsd_i386_set_idt(9, 0);
  70     bsd_i386_set_idt(10, 0);
  71     bsd_i386_set_idt(11, 0);
  72     bsd_i386_set_idt(12, 0);
  73     bsd_i386_set_idt(13, 0);
  74     bsd_i386_set_idt(14, 0);
  75     bsd_i386_set_idt(15, 0);
  76     bsd_i386_set_idt(16, 0);
  77     bsd_i386_set_idt(17, 0);
  78     bsd_i386_set_idt(18, 0);
  79     bsd_i386_set_idt(19, 0);
  80     bsd_i386_set_idt(0x80, 3);
  81
  82     /* segment setup */
  83     env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
  84             PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  85     env->gdt.limit = sizeof(uint64_t) * TARGET_GDT_ENTRIES - 1;
  86     gdt_table = g2h_untagged(env->gdt.base);
  87
  88     bsd_i386_write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
  89             DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
  90             (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
  91
  92     bsd_i386_write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
  93             DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
  94             (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
  95
  96     cpu_x86_load_seg(env, R_CS, __USER_CS);
  97     cpu_x86_load_seg(env, R_SS, __USER_DS);
  98     cpu_x86_load_seg(env, R_DS, __USER_DS);
  99     cpu_x86_load_seg(env, R_ES, __USER_DS);
 100     cpu_x86_load_seg(env, R_FS, __USER_DS);
 101     cpu_x86_load_seg(env, R_GS, __USER_DS);
 102     /* This hack makes Wine work... */
 103     env->segs[R_FS].selector = 0;
 104 }
 105
 106 static inline void target_cpu_loop(CPUX86State *env)
 107 {
 108     CPUState *cs = env_cpu(env);
 109     int trapnr;
 110     abi_ulong pc;
 111     /* target_siginfo_t info; */
 112
 113     for (;;) {
 114         cpu_exec_start(cs);
 115         trapnr = cpu_exec(cs);
 116         cpu_exec_end(cs);
 117         process_queued_cpu_work(cs);
 118
 119         switch (trapnr) {
 120         case 0x80:
 121             /* syscall from int $0x80 */
 122             if (bsd_type == target_freebsd) {
 123                 abi_ulong params = (abi_ulong) env->regs[R_ESP] +
 124                     sizeof(int32_t);
 125                 int32_t syscall_nr = env->regs[R_EAX];
 126                 int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;
 127
 128                 if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
 129                     get_user_s32(syscall_nr, params);
 130                     params += sizeof(int32_t);
 131                 } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
 132                     get_user_s32(syscall_nr, params);
 133                     params += sizeof(int64_t);
 134                 }
 135                 get_user_s32(arg1, params);
 136                 params += sizeof(int32_t);
 137                 get_user_s32(arg2, params);
 138                 params += sizeof(int32_t);
 139                 get_user_s32(arg3, params);
 140                 params += sizeof(int32_t);
 141                 get_user_s32(arg4, params);
 142                 params += sizeof(int32_t);
 143                 get_user_s32(arg5, params);
 144                 params += sizeof(int32_t);
 145                 get_user_s32(arg6, params);
 146                 params += sizeof(int32_t);
 147                 get_user_s32(arg7, params);
 148                 params += sizeof(int32_t);
 149                 get_user_s32(arg8, params);
 150                 env->regs[R_EAX] = do_freebsd_syscall(env,
 151                                                       syscall_nr,
 152                                                       arg1,
 153                                                       arg2,
 154                                                       arg3,
 155                                                       arg4,
 156                                                       arg5,
 157                                                       arg6,
 158                                                       arg7,
 159                                                       arg8);
 160             } else { /* if (bsd_type == target_openbsd) */
 161                 env->regs[R_EAX] = do_openbsd_syscall(env,
 162                                                       env->regs[R_EAX],
 163                                                       env->regs[R_EBX],
 164                                                       env->regs[R_ECX],
 165                                                       env->regs[R_EDX],
 166                                                       env->regs[R_ESI],
 167                                                       env->regs[R_EDI],
 168                                                       env->regs[R_EBP]);
 169             }
 170             if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
 171                 env->regs[R_EAX] = -env->regs[R_EAX];
 172                 env->eflags |= CC_C;
 173             } else {
 174                 env->eflags &= ~CC_C;
 175             }
 176             break;
 177
 178         case EXCP_INTERRUPT:
 179             /* just indicate that signals should be handled asap */
 180             break;
 181
 182         case EXCP_ATOMIC:
 183             cpu_exec_step_atomic(cs);
 184             break;
 185
 186         default:
 187             pc = env->segs[R_CS].base + env->eip;
 188             fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - "
 189                     "aborting\n", (long)pc, trapnr);
 190             abort();
 191         }
 192         process_pending_signals(env);
 193     }
 194 }
 195
 196 static inline void target_cpu_clone_regs(CPUX86State *env, target_ulong newsp)
 197 {
 198     if (newsp) {
 199         env->regs[R_ESP] = newsp;
 200     }
 201     env->regs[R_EAX] = 0;
 202 }
 203
 204 static inline void target_cpu_reset(CPUArchState *cpu)
 205 {
 206     cpu_reset(env_cpu(cpu));
 207 }
 208
 209 #endif /* ! _TARGET_ARCH_CPU_H_ */