| /* |
| * i386 helpers |
| * |
| * Copyright (c) 2003 Fabrice Bellard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include "exec.h" |
| |
| const uint8_t parity_table[256] = { |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0, |
| 0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P, |
| }; |
| |
| /* modulo 17 table */ |
| const uint8_t rclw_table[32] = { |
| 0, 1, 2, 3, 4, 5, 6, 7, |
| 8, 9,10,11,12,13,14,15, |
| 16, 0, 1, 2, 3, 4, 5, 6, |
| 7, 8, 9,10,11,12,13,14, |
| }; |
| |
| /* modulo 9 table */ |
| const uint8_t rclb_table[32] = { |
| 0, 1, 2, 3, 4, 5, 6, 7, |
| 8, 0, 1, 2, 3, 4, 5, 6, |
| 7, 8, 0, 1, 2, 3, 4, 5, |
| 6, 7, 8, 0, 1, 2, 3, 4, |
| }; |
| |
| const CPU86_LDouble f15rk[7] = |
| { |
| 0.00000000000000000000L, |
| 1.00000000000000000000L, |
| 3.14159265358979323851L, /*pi*/ |
| 0.30102999566398119523L, /*lg2*/ |
| 0.69314718055994530943L, /*ln2*/ |
| 1.44269504088896340739L, /*l2e*/ |
| 3.32192809488736234781L, /*l2t*/ |
| }; |
| |
| /* thread support */ |
| |
| spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED; |
| |
| void cpu_lock(void) |
| { |
| spin_lock(&global_cpu_lock); |
| } |
| |
| void cpu_unlock(void) |
| { |
| spin_unlock(&global_cpu_lock); |
| } |
| |
| void cpu_loop_exit(void) |
| { |
| /* NOTE: the register at this point must be saved by hand because |
| longjmp restore them */ |
| #ifdef reg_EAX |
| env->regs[R_EAX] = EAX; |
| #endif |
| #ifdef reg_ECX |
| env->regs[R_ECX] = ECX; |
| #endif |
| #ifdef reg_EDX |
| env->regs[R_EDX] = EDX; |
| #endif |
| #ifdef reg_EBX |
| env->regs[R_EBX] = EBX; |
| #endif |
| #ifdef reg_ESP |
| env->regs[R_ESP] = ESP; |
| #endif |
| #ifdef reg_EBP |
| env->regs[R_EBP] = EBP; |
| #endif |
| #ifdef reg_ESI |
| env->regs[R_ESI] = ESI; |
| #endif |
| #ifdef reg_EDI |
| env->regs[R_EDI] = EDI; |
| #endif |
| longjmp(env->jmp_env, 1); |
| } |
| |
| static inline void get_ss_esp_from_tss(uint32_t *ss_ptr, |
| uint32_t *esp_ptr, int dpl) |
| { |
| int type, index, shift; |
| |
| #if 0 |
| { |
| int i; |
| printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit); |
| for(i=0;i<env->tr.limit;i++) { |
| printf("%02x ", env->tr.base[i]); |
| if ((i & 7) == 7) printf("\n"); |
| } |
| printf("\n"); |
| } |
| #endif |
| |
| if (!(env->tr.flags & DESC_P_MASK)) |
| cpu_abort(env, "invalid tss"); |
| type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; |
| if ((type & 7) != 1) |
| cpu_abort(env, "invalid tss type"); |
| shift = type >> 3; |
| index = (dpl * 4 + 2) << shift; |
| if (index + (4 << shift) - 1 > env->tr.limit) |
| raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc); |
| if (shift == 0) { |
| *esp_ptr = lduw_kernel(env->tr.base + index); |
| *ss_ptr = lduw_kernel(env->tr.base + index + 2); |
| } else { |
| *esp_ptr = ldl_kernel(env->tr.base + index); |
| *ss_ptr = lduw_kernel(env->tr.base + index + 4); |
| } |
| } |
| |
| /* return non zero if error */ |
| static inline int load_segment(uint32_t *e1_ptr, uint32_t *e2_ptr, |
| int selector) |
| { |
| SegmentCache *dt; |
| int index; |
| uint8_t *ptr; |
| |
| if (selector & 0x4) |
| dt = &env->ldt; |
| else |
| dt = &env->gdt; |
| index = selector & ~7; |
| if ((index + 7) > dt->limit) |
| return -1; |
| ptr = dt->base + index; |
| *e1_ptr = ldl_kernel(ptr); |
| *e2_ptr = ldl_kernel(ptr + 4); |
| return 0; |
| } |
| |
| static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2) |
| { |
| unsigned int limit; |
| limit = (e1 & 0xffff) | (e2 & 0x000f0000); |
| if (e2 & DESC_G_MASK) |
| limit = (limit << 12) | 0xfff; |
| return limit; |
| } |
| |
| static inline uint8_t *get_seg_base(uint32_t e1, uint32_t e2) |
| { |
| return (uint8_t *)((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000)); |
| } |
| |
| static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1, uint32_t e2) |
| { |
| sc->base = get_seg_base(e1, e2); |
| sc->limit = get_seg_limit(e1, e2); |
| sc->flags = e2; |
| } |
| |
| /* init the segment cache in vm86 mode. */ |
| static inline void load_seg_vm(int seg, int selector) |
| { |
| selector &= 0xffff; |
| cpu_x86_load_seg_cache(env, seg, selector, |
| (uint8_t *)(selector << 4), 0xffff, 0); |
| } |
| |
| /* protected mode interrupt */ |
| static void do_interrupt_protected(int intno, int is_int, int error_code, |
| unsigned int next_eip, int is_hw) |
| { |
| SegmentCache *dt; |
| uint8_t *ptr, *ssp; |
| int type, dpl, selector, ss_dpl, cpl; |
| int has_error_code, new_stack, shift; |
| uint32_t e1, e2, offset, ss, esp, ss_e1, ss_e2, push_size; |
| uint32_t old_cs, old_ss, old_esp, old_eip; |
| |
| dt = &env->idt; |
| if (intno * 8 + 7 > dt->limit) |
| raise_exception_err(EXCP0D_GPF, intno * 8 + 2); |
| ptr = dt->base + intno * 8; |
| e1 = ldl_kernel(ptr); |
| e2 = ldl_kernel(ptr + 4); |
| /* check gate type */ |
| type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; |
| switch(type) { |
| case 5: /* task gate */ |
| cpu_abort(env, "task gate not supported"); |
| break; |
| case 6: /* 286 interrupt gate */ |
| case 7: /* 286 trap gate */ |
| case 14: /* 386 interrupt gate */ |
| case 15: /* 386 trap gate */ |
| break; |
| default: |
| raise_exception_err(EXCP0D_GPF, intno * 8 + 2); |
| break; |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| cpl = env->hflags & HF_CPL_MASK; |
| /* check privledge if software int */ |
| if (is_int && dpl < cpl) |
| raise_exception_err(EXCP0D_GPF, intno * 8 + 2); |
| /* check valid bit */ |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, intno * 8 + 2); |
| selector = e1 >> 16; |
| offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff); |
| if ((selector & 0xfffc) == 0) |
| raise_exception_err(EXCP0D_GPF, 0); |
| |
| if (load_segment(&e1, &e2, selector) != 0) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl > cpl) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc); |
| if (!(e2 & DESC_C_MASK) && dpl < cpl) { |
| /* to inner priviledge */ |
| get_ss_esp_from_tss(&ss, &esp, dpl); |
| if ((ss & 0xfffc) == 0) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if ((ss & 3) != dpl) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if (load_segment(&ss_e1, &ss_e2, ss) != 0) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; |
| if (ss_dpl != dpl) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if (!(ss_e2 & DESC_S_MASK) || |
| (ss_e2 & DESC_CS_MASK) || |
| !(ss_e2 & DESC_W_MASK)) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if (!(ss_e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| new_stack = 1; |
| } else if ((e2 & DESC_C_MASK) || dpl == cpl) { |
| /* to same priviledge */ |
| new_stack = 0; |
| } else { |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| new_stack = 0; /* avoid warning */ |
| } |
| |
| shift = type >> 3; |
| has_error_code = 0; |
| if (!is_int && !is_hw) { |
| switch(intno) { |
| case 8: |
| case 10: |
| case 11: |
| case 12: |
| case 13: |
| case 14: |
| case 17: |
| has_error_code = 1; |
| break; |
| } |
| } |
| push_size = 6 + (new_stack << 2) + (has_error_code << 1); |
| if (env->eflags & VM_MASK) |
| push_size += 8; |
| push_size <<= shift; |
| |
| /* XXX: check that enough room is available */ |
| if (new_stack) { |
| old_esp = ESP; |
| old_ss = env->segs[R_SS].selector; |
| ss = (ss & ~3) | dpl; |
| cpu_x86_load_seg_cache(env, R_SS, ss, |
| get_seg_base(ss_e1, ss_e2), |
| get_seg_limit(ss_e1, ss_e2), |
| ss_e2); |
| } else { |
| old_esp = 0; |
| old_ss = 0; |
| esp = ESP; |
| } |
| if (is_int) |
| old_eip = next_eip; |
| else |
| old_eip = env->eip; |
| old_cs = env->segs[R_CS].selector; |
| selector = (selector & ~3) | dpl; |
| cpu_x86_load_seg_cache(env, R_CS, selector, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), |
| e2); |
| cpu_x86_set_cpl(env, dpl); |
| env->eip = offset; |
| ESP = esp - push_size; |
| ssp = env->segs[R_SS].base + esp; |
| if (shift == 1) { |
| int old_eflags; |
| if (env->eflags & VM_MASK) { |
| ssp -= 4; |
| stl_kernel(ssp, env->segs[R_GS].selector); |
| ssp -= 4; |
| stl_kernel(ssp, env->segs[R_FS].selector); |
| ssp -= 4; |
| stl_kernel(ssp, env->segs[R_DS].selector); |
| ssp -= 4; |
| stl_kernel(ssp, env->segs[R_ES].selector); |
| } |
| if (new_stack) { |
| ssp -= 4; |
| stl_kernel(ssp, old_ss); |
| ssp -= 4; |
| stl_kernel(ssp, old_esp); |
| } |
| ssp -= 4; |
| old_eflags = compute_eflags(); |
| stl_kernel(ssp, old_eflags); |
| ssp -= 4; |
| stl_kernel(ssp, old_cs); |
| ssp -= 4; |
| stl_kernel(ssp, old_eip); |
| if (has_error_code) { |
| ssp -= 4; |
| stl_kernel(ssp, error_code); |
| } |
| } else { |
| if (new_stack) { |
| ssp -= 2; |
| stw_kernel(ssp, old_ss); |
| ssp -= 2; |
| stw_kernel(ssp, old_esp); |
| } |
| ssp -= 2; |
| stw_kernel(ssp, compute_eflags()); |
| ssp -= 2; |
| stw_kernel(ssp, old_cs); |
| ssp -= 2; |
| stw_kernel(ssp, old_eip); |
| if (has_error_code) { |
| ssp -= 2; |
| stw_kernel(ssp, error_code); |
| } |
| } |
| |
| /* interrupt gate clear IF mask */ |
| if ((type & 1) == 0) { |
| env->eflags &= ~IF_MASK; |
| } |
| env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK); |
| } |
| |
| /* real mode interrupt */ |
| static void do_interrupt_real(int intno, int is_int, int error_code, |
| unsigned int next_eip) |
| { |
| SegmentCache *dt; |
| uint8_t *ptr, *ssp; |
| int selector; |
| uint32_t offset, esp; |
| uint32_t old_cs, old_eip; |
| |
| /* real mode (simpler !) */ |
| dt = &env->idt; |
| if (intno * 4 + 3 > dt->limit) |
| raise_exception_err(EXCP0D_GPF, intno * 8 + 2); |
| ptr = dt->base + intno * 4; |
| offset = lduw_kernel(ptr); |
| selector = lduw_kernel(ptr + 2); |
| esp = ESP; |
| ssp = env->segs[R_SS].base; |
| if (is_int) |
| old_eip = next_eip; |
| else |
| old_eip = env->eip; |
| old_cs = env->segs[R_CS].selector; |
| esp -= 2; |
| stw_kernel(ssp + (esp & 0xffff), compute_eflags()); |
| esp -= 2; |
| stw_kernel(ssp + (esp & 0xffff), old_cs); |
| esp -= 2; |
| stw_kernel(ssp + (esp & 0xffff), old_eip); |
| |
| /* update processor state */ |
| ESP = (ESP & ~0xffff) | (esp & 0xffff); |
| env->eip = offset; |
| env->segs[R_CS].selector = selector; |
| env->segs[R_CS].base = (uint8_t *)(selector << 4); |
| env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK); |
| } |
| |
| /* fake user mode interrupt */ |
| void do_interrupt_user(int intno, int is_int, int error_code, |
| unsigned int next_eip) |
| { |
| SegmentCache *dt; |
| uint8_t *ptr; |
| int dpl, cpl; |
| uint32_t e2; |
| |
| dt = &env->idt; |
| ptr = dt->base + (intno * 8); |
| e2 = ldl_kernel(ptr + 4); |
| |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| cpl = env->hflags & HF_CPL_MASK; |
| /* check privledge if software int */ |
| if (is_int && dpl < cpl) |
| raise_exception_err(EXCP0D_GPF, intno * 8 + 2); |
| |
| /* Since we emulate only user space, we cannot do more than |
| exiting the emulation with the suitable exception and error |
| code */ |
| if (is_int) |
| EIP = next_eip; |
| } |
| |
| /* |
| * Begin excution of an interruption. is_int is TRUE if coming from |
| * the int instruction. next_eip is the EIP value AFTER the interrupt |
| * instruction. It is only relevant if is_int is TRUE. |
| */ |
| void do_interrupt(int intno, int is_int, int error_code, |
| unsigned int next_eip, int is_hw) |
| { |
| if (env->cr[0] & CR0_PE_MASK) { |
| do_interrupt_protected(intno, is_int, error_code, next_eip, is_hw); |
| } else { |
| do_interrupt_real(intno, is_int, error_code, next_eip); |
| } |
| } |
| |
| /* |
| * Signal an interruption. It is executed in the main CPU loop. |
| * is_int is TRUE if coming from the int instruction. next_eip is the |
| * EIP value AFTER the interrupt instruction. It is only relevant if |
| * is_int is TRUE. |
| */ |
| void raise_interrupt(int intno, int is_int, int error_code, |
| unsigned int next_eip) |
| { |
| env->exception_index = intno; |
| env->error_code = error_code; |
| env->exception_is_int = is_int; |
| env->exception_next_eip = next_eip; |
| cpu_loop_exit(); |
| } |
| |
| /* shortcuts to generate exceptions */ |
| void raise_exception_err(int exception_index, int error_code) |
| { |
| raise_interrupt(exception_index, 0, error_code, 0); |
| } |
| |
| void raise_exception(int exception_index) |
| { |
| raise_interrupt(exception_index, 0, 0, 0); |
| } |
| |
| #ifdef BUGGY_GCC_DIV64 |
| /* gcc 2.95.4 on PowerPC does not seem to like using __udivdi3, so we |
| call it from another function */ |
| uint32_t div64(uint32_t *q_ptr, uint64_t num, uint32_t den) |
| { |
| *q_ptr = num / den; |
| return num % den; |
| } |
| |
| int32_t idiv64(int32_t *q_ptr, int64_t num, int32_t den) |
| { |
| *q_ptr = num / den; |
| return num % den; |
| } |
| #endif |
| |
| void helper_divl_EAX_T0(uint32_t eip) |
| { |
| unsigned int den, q, r; |
| uint64_t num; |
| |
| num = EAX | ((uint64_t)EDX << 32); |
| den = T0; |
| if (den == 0) { |
| EIP = eip; |
| raise_exception(EXCP00_DIVZ); |
| } |
| #ifdef BUGGY_GCC_DIV64 |
| r = div64(&q, num, den); |
| #else |
| q = (num / den); |
| r = (num % den); |
| #endif |
| EAX = q; |
| EDX = r; |
| } |
| |
| void helper_idivl_EAX_T0(uint32_t eip) |
| { |
| int den, q, r; |
| int64_t num; |
| |
| num = EAX | ((uint64_t)EDX << 32); |
| den = T0; |
| if (den == 0) { |
| EIP = eip; |
| raise_exception(EXCP00_DIVZ); |
| } |
| #ifdef BUGGY_GCC_DIV64 |
| r = idiv64(&q, num, den); |
| #else |
| q = (num / den); |
| r = (num % den); |
| #endif |
| EAX = q; |
| EDX = r; |
| } |
| |
| void helper_cmpxchg8b(void) |
| { |
| uint64_t d; |
| int eflags; |
| |
| eflags = cc_table[CC_OP].compute_all(); |
| d = ldq((uint8_t *)A0); |
| if (d == (((uint64_t)EDX << 32) | EAX)) { |
| stq((uint8_t *)A0, ((uint64_t)ECX << 32) | EBX); |
| eflags |= CC_Z; |
| } else { |
| EDX = d >> 32; |
| EAX = d; |
| eflags &= ~CC_Z; |
| } |
| CC_SRC = eflags; |
| } |
| |
| /* We simulate a pre-MMX pentium as in valgrind */ |
| #define CPUID_FP87 (1 << 0) |
| #define CPUID_VME (1 << 1) |
| #define CPUID_DE (1 << 2) |
| #define CPUID_PSE (1 << 3) |
| #define CPUID_TSC (1 << 4) |
| #define CPUID_MSR (1 << 5) |
| #define CPUID_PAE (1 << 6) |
| #define CPUID_MCE (1 << 7) |
| #define CPUID_CX8 (1 << 8) |
| #define CPUID_APIC (1 << 9) |
| #define CPUID_SEP (1 << 11) /* sysenter/sysexit */ |
| #define CPUID_MTRR (1 << 12) |
| #define CPUID_PGE (1 << 13) |
| #define CPUID_MCA (1 << 14) |
| #define CPUID_CMOV (1 << 15) |
| /* ... */ |
| #define CPUID_MMX (1 << 23) |
| #define CPUID_FXSR (1 << 24) |
| #define CPUID_SSE (1 << 25) |
| #define CPUID_SSE2 (1 << 26) |
| |
| void helper_cpuid(void) |
| { |
| if (EAX == 0) { |
| EAX = 1; /* max EAX index supported */ |
| EBX = 0x756e6547; |
| ECX = 0x6c65746e; |
| EDX = 0x49656e69; |
| } else if (EAX == 1) { |
| int family, model, stepping; |
| /* EAX = 1 info */ |
| #if 0 |
| /* pentium 75-200 */ |
| family = 5; |
| model = 2; |
| stepping = 11; |
| #else |
| /* pentium pro */ |
| family = 6; |
| model = 1; |
| stepping = 3; |
| #endif |
| EAX = (family << 8) | (model << 4) | stepping; |
| EBX = 0; |
| ECX = 0; |
| EDX = CPUID_FP87 | CPUID_DE | CPUID_PSE | |
| CPUID_TSC | CPUID_MSR | CPUID_MCE | |
| CPUID_CX8 | CPUID_PGE | CPUID_CMOV; |
| } |
| } |
| |
| void helper_lldt_T0(void) |
| { |
| int selector; |
| SegmentCache *dt; |
| uint32_t e1, e2; |
| int index; |
| uint8_t *ptr; |
| |
| selector = T0 & 0xffff; |
| if ((selector & 0xfffc) == 0) { |
| /* XXX: NULL selector case: invalid LDT */ |
| env->ldt.base = NULL; |
| env->ldt.limit = 0; |
| } else { |
| if (selector & 0x4) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| dt = &env->gdt; |
| index = selector & ~7; |
| if ((index + 7) > dt->limit) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| ptr = dt->base + index; |
| e1 = ldl_kernel(ptr); |
| e2 = ldl_kernel(ptr + 4); |
| if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc); |
| load_seg_cache_raw_dt(&env->ldt, e1, e2); |
| } |
| env->ldt.selector = selector; |
| } |
| |
| void helper_ltr_T0(void) |
| { |
| int selector; |
| SegmentCache *dt; |
| uint32_t e1, e2; |
| int index, type; |
| uint8_t *ptr; |
| |
| selector = T0 & 0xffff; |
| if ((selector & 0xfffc) == 0) { |
| /* NULL selector case: invalid LDT */ |
| env->tr.base = NULL; |
| env->tr.limit = 0; |
| env->tr.flags = 0; |
| } else { |
| if (selector & 0x4) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| dt = &env->gdt; |
| index = selector & ~7; |
| if ((index + 7) > dt->limit) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| ptr = dt->base + index; |
| e1 = ldl_kernel(ptr); |
| e2 = ldl_kernel(ptr + 4); |
| type = (e2 >> DESC_TYPE_SHIFT) & 0xf; |
| if ((e2 & DESC_S_MASK) || |
| (type != 2 && type != 9)) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc); |
| load_seg_cache_raw_dt(&env->tr, e1, e2); |
| e2 |= 0x00000200; /* set the busy bit */ |
| stl_kernel(ptr + 4, e2); |
| } |
| env->tr.selector = selector; |
| } |
| |
| /* only works if protected mode and not VM86. Calling load_seg with |
| seg_reg == R_CS is discouraged */ |
| void load_seg(int seg_reg, int selector, unsigned int cur_eip) |
| { |
| uint32_t e1, e2; |
| |
| if ((selector & 0xfffc) == 0) { |
| /* null selector case */ |
| if (seg_reg == R_SS) { |
| EIP = cur_eip; |
| raise_exception_err(EXCP0D_GPF, 0); |
| } else { |
| cpu_x86_load_seg_cache(env, seg_reg, selector, NULL, 0, 0); |
| } |
| } else { |
| if (load_segment(&e1, &e2, selector) != 0) { |
| EIP = cur_eip; |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_S_MASK) || |
| (e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) { |
| EIP = cur_eip; |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| } |
| |
| if (seg_reg == R_SS) { |
| if ((e2 & (DESC_CS_MASK | DESC_W_MASK)) == 0) { |
| EIP = cur_eip; |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| } |
| } else { |
| if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) { |
| EIP = cur_eip; |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| } |
| } |
| |
| if (!(e2 & DESC_P_MASK)) { |
| EIP = cur_eip; |
| if (seg_reg == R_SS) |
| raise_exception_err(EXCP0C_STACK, selector & 0xfffc); |
| else |
| raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| cpu_x86_load_seg_cache(env, seg_reg, selector, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), |
| e2); |
| #if 0 |
| fprintf(logfile, "load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx flags=%08x\n", |
| selector, (unsigned long)sc->base, sc->limit, sc->flags); |
| #endif |
| } |
| } |
| |
| /* protected mode jump */ |
| void helper_ljmp_protected_T0_T1(void) |
| { |
| int new_cs, new_eip; |
| uint32_t e1, e2, cpl, dpl, rpl, limit; |
| |
| new_cs = T0; |
| new_eip = T1; |
| if ((new_cs & 0xfffc) == 0) |
| raise_exception_err(EXCP0D_GPF, 0); |
| if (load_segment(&e1, &e2, new_cs) != 0) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| cpl = env->hflags & HF_CPL_MASK; |
| if (e2 & DESC_S_MASK) { |
| if (!(e2 & DESC_CS_MASK)) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (e2 & DESC_CS_MASK) { |
| /* conforming code segment */ |
| if (dpl > cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| } else { |
| /* non conforming code segment */ |
| rpl = new_cs & 3; |
| if (rpl > cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| if (dpl != cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc); |
| limit = get_seg_limit(e1, e2); |
| if (new_eip > limit) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, |
| get_seg_base(e1, e2), limit, e2); |
| EIP = new_eip; |
| } else { |
| cpu_abort(env, "jmp to call/task gate not supported 0x%04x:0x%08x", |
| new_cs, new_eip); |
| } |
| } |
| |
| /* real mode call */ |
| void helper_lcall_real_T0_T1(int shift, int next_eip) |
| { |
| int new_cs, new_eip; |
| uint32_t esp, esp_mask; |
| uint8_t *ssp; |
| |
| new_cs = T0; |
| new_eip = T1; |
| esp = ESP; |
| esp_mask = 0xffffffff; |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| esp_mask = 0xffff; |
| ssp = env->segs[R_SS].base; |
| if (shift) { |
| esp -= 4; |
| stl_kernel(ssp + (esp & esp_mask), env->segs[R_CS].selector); |
| esp -= 4; |
| stl_kernel(ssp + (esp & esp_mask), next_eip); |
| } else { |
| esp -= 2; |
| stw_kernel(ssp + (esp & esp_mask), env->segs[R_CS].selector); |
| esp -= 2; |
| stw_kernel(ssp + (esp & esp_mask), next_eip); |
| } |
| |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| ESP = (ESP & ~0xffff) | (esp & 0xffff); |
| else |
| ESP = esp; |
| env->eip = new_eip; |
| env->segs[R_CS].selector = new_cs; |
| env->segs[R_CS].base = (uint8_t *)(new_cs << 4); |
| } |
| |
| /* protected mode call */ |
| void helper_lcall_protected_T0_T1(int shift, int next_eip) |
| { |
| int new_cs, new_eip; |
| uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count; |
| uint32_t ss, ss_e1, ss_e2, push_size, sp, type, ss_dpl; |
| uint32_t old_ss, old_esp, val, i, limit; |
| uint8_t *ssp, *old_ssp; |
| |
| new_cs = T0; |
| new_eip = T1; |
| if ((new_cs & 0xfffc) == 0) |
| raise_exception_err(EXCP0D_GPF, 0); |
| if (load_segment(&e1, &e2, new_cs) != 0) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| cpl = env->hflags & HF_CPL_MASK; |
| if (e2 & DESC_S_MASK) { |
| if (!(e2 & DESC_CS_MASK)) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (e2 & DESC_CS_MASK) { |
| /* conforming code segment */ |
| if (dpl > cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| } else { |
| /* non conforming code segment */ |
| rpl = new_cs & 3; |
| if (rpl > cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| if (dpl != cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc); |
| |
| sp = ESP; |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| sp &= 0xffff; |
| ssp = env->segs[R_SS].base + sp; |
| if (shift) { |
| ssp -= 4; |
| stl_kernel(ssp, env->segs[R_CS].selector); |
| ssp -= 4; |
| stl_kernel(ssp, next_eip); |
| } else { |
| ssp -= 2; |
| stw_kernel(ssp, env->segs[R_CS].selector); |
| ssp -= 2; |
| stw_kernel(ssp, next_eip); |
| } |
| sp -= (4 << shift); |
| |
| limit = get_seg_limit(e1, e2); |
| if (new_eip > limit) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| /* from this point, not restartable */ |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| ESP = (ESP & 0xffff0000) | (sp & 0xffff); |
| else |
| ESP = sp; |
| cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, |
| get_seg_base(e1, e2), limit, e2); |
| EIP = new_eip; |
| } else { |
| /* check gate type */ |
| type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; |
| switch(type) { |
| case 1: /* available 286 TSS */ |
| case 9: /* available 386 TSS */ |
| case 5: /* task gate */ |
| cpu_abort(env, "task gate not supported"); |
| break; |
| case 4: /* 286 call gate */ |
| case 12: /* 386 call gate */ |
| break; |
| default: |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| break; |
| } |
| shift = type >> 3; |
| |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| rpl = new_cs & 3; |
| if (dpl < cpl || dpl < rpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| /* check valid bit */ |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc); |
| selector = e1 >> 16; |
| offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff); |
| if ((selector & 0xfffc) == 0) |
| raise_exception_err(EXCP0D_GPF, 0); |
| |
| if (load_segment(&e1, &e2, selector) != 0) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl > cpl) |
| raise_exception_err(EXCP0D_GPF, selector & 0xfffc); |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc); |
| |
| if (!(e2 & DESC_C_MASK) && dpl < cpl) { |
| /* to inner priviledge */ |
| get_ss_esp_from_tss(&ss, &sp, dpl); |
| if ((ss & 0xfffc) == 0) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if ((ss & 3) != dpl) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if (load_segment(&ss_e1, &ss_e2, ss) != 0) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; |
| if (ss_dpl != dpl) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if (!(ss_e2 & DESC_S_MASK) || |
| (ss_e2 & DESC_CS_MASK) || |
| !(ss_e2 & DESC_W_MASK)) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| if (!(ss_e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0A_TSS, ss & 0xfffc); |
| |
| param_count = e2 & 0x1f; |
| push_size = ((param_count * 2) + 8) << shift; |
| |
| old_esp = ESP; |
| old_ss = env->segs[R_SS].selector; |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| old_esp &= 0xffff; |
| old_ssp = env->segs[R_SS].base + old_esp; |
| |
| /* XXX: from this point not restartable */ |
| ss = (ss & ~3) | dpl; |
| cpu_x86_load_seg_cache(env, R_SS, ss, |
| get_seg_base(ss_e1, ss_e2), |
| get_seg_limit(ss_e1, ss_e2), |
| ss_e2); |
| |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| sp &= 0xffff; |
| ssp = env->segs[R_SS].base + sp; |
| if (shift) { |
| ssp -= 4; |
| stl_kernel(ssp, old_ss); |
| ssp -= 4; |
| stl_kernel(ssp, old_esp); |
| ssp -= 4 * param_count; |
| for(i = 0; i < param_count; i++) { |
| val = ldl_kernel(old_ssp + i * 4); |
| stl_kernel(ssp + i * 4, val); |
| } |
| } else { |
| ssp -= 2; |
| stw_kernel(ssp, old_ss); |
| ssp -= 2; |
| stw_kernel(ssp, old_esp); |
| ssp -= 2 * param_count; |
| for(i = 0; i < param_count; i++) { |
| val = lduw_kernel(old_ssp + i * 2); |
| stw_kernel(ssp + i * 2, val); |
| } |
| } |
| } else { |
| /* to same priviledge */ |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| sp &= 0xffff; |
| ssp = env->segs[R_SS].base + sp; |
| push_size = (4 << shift); |
| } |
| |
| if (shift) { |
| ssp -= 4; |
| stl_kernel(ssp, env->segs[R_CS].selector); |
| ssp -= 4; |
| stl_kernel(ssp, next_eip); |
| } else { |
| ssp -= 2; |
| stw_kernel(ssp, env->segs[R_CS].selector); |
| ssp -= 2; |
| stw_kernel(ssp, next_eip); |
| } |
| |
| sp -= push_size; |
| selector = (selector & ~3) | dpl; |
| cpu_x86_load_seg_cache(env, R_CS, selector, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), |
| e2); |
| cpu_x86_set_cpl(env, dpl); |
| |
| /* from this point, not restartable if same priviledge */ |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| ESP = (ESP & 0xffff0000) | (sp & 0xffff); |
| else |
| ESP = sp; |
| EIP = offset; |
| } |
| } |
| |
| /* real mode iret */ |
| void helper_iret_real(int shift) |
| { |
| uint32_t sp, new_cs, new_eip, new_eflags, new_esp; |
| uint8_t *ssp; |
| int eflags_mask; |
| |
| sp = ESP & 0xffff; |
| ssp = env->segs[R_SS].base + sp; |
| if (shift == 1) { |
| /* 32 bits */ |
| new_eflags = ldl_kernel(ssp + 8); |
| new_cs = ldl_kernel(ssp + 4) & 0xffff; |
| new_eip = ldl_kernel(ssp) & 0xffff; |
| } else { |
| /* 16 bits */ |
| new_eflags = lduw_kernel(ssp + 4); |
| new_cs = lduw_kernel(ssp + 2); |
| new_eip = lduw_kernel(ssp); |
| } |
| new_esp = sp + (6 << shift); |
| ESP = (ESP & 0xffff0000) | |
| (new_esp & 0xffff); |
| load_seg_vm(R_CS, new_cs); |
| env->eip = new_eip; |
| eflags_mask = FL_UPDATE_CPL0_MASK; |
| if (shift == 0) |
| eflags_mask &= 0xffff; |
| load_eflags(new_eflags, eflags_mask); |
| } |
| |
| /* protected mode iret */ |
| static inline void helper_ret_protected(int shift, int is_iret, int addend) |
| { |
| uint32_t sp, new_cs, new_eip, new_eflags, new_esp, new_ss; |
| uint32_t new_es, new_ds, new_fs, new_gs; |
| uint32_t e1, e2, ss_e1, ss_e2; |
| int cpl, dpl, rpl, eflags_mask; |
| uint8_t *ssp; |
| |
| sp = ESP; |
| if (!(env->segs[R_SS].flags & DESC_B_MASK)) |
| sp &= 0xffff; |
| ssp = env->segs[R_SS].base + sp; |
| if (shift == 1) { |
| /* 32 bits */ |
| if (is_iret) |
| new_eflags = ldl_kernel(ssp + 8); |
| new_cs = ldl_kernel(ssp + 4) & 0xffff; |
| new_eip = ldl_kernel(ssp); |
| if (is_iret && (new_eflags & VM_MASK)) |
| goto return_to_vm86; |
| } else { |
| /* 16 bits */ |
| if (is_iret) |
| new_eflags = lduw_kernel(ssp + 4); |
| new_cs = lduw_kernel(ssp + 2); |
| new_eip = lduw_kernel(ssp); |
| } |
| if ((new_cs & 0xfffc) == 0) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| if (load_segment(&e1, &e2, new_cs) != 0) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| if (!(e2 & DESC_S_MASK) || |
| !(e2 & DESC_CS_MASK)) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| cpl = env->hflags & HF_CPL_MASK; |
| rpl = new_cs & 3; |
| if (rpl < cpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (e2 & DESC_CS_MASK) { |
| if (dpl > rpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| } else { |
| if (dpl != rpl) |
| raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc); |
| |
| if (rpl == cpl) { |
| /* return to same priledge level */ |
| cpu_x86_load_seg_cache(env, R_CS, new_cs, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), |
| e2); |
| new_esp = sp + (4 << shift) + ((2 * is_iret) << shift) + addend; |
| } else { |
| /* return to different priviledge level */ |
| ssp += (4 << shift) + ((2 * is_iret) << shift) + addend; |
| if (shift == 1) { |
| /* 32 bits */ |
| new_esp = ldl_kernel(ssp); |
| new_ss = ldl_kernel(ssp + 4) & 0xffff; |
| } else { |
| /* 16 bits */ |
| new_esp = lduw_kernel(ssp); |
| new_ss = lduw_kernel(ssp + 2); |
| } |
| |
| if ((new_ss & 3) != rpl) |
| raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc); |
| if (load_segment(&ss_e1, &ss_e2, new_ss) != 0) |
| raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc); |
| if (!(ss_e2 & DESC_S_MASK) || |
| (ss_e2 & DESC_CS_MASK) || |
| !(ss_e2 & DESC_W_MASK)) |
| raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc); |
| dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl != rpl) |
| raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc); |
| if (!(ss_e2 & DESC_P_MASK)) |
| raise_exception_err(EXCP0B_NOSEG, new_ss & 0xfffc); |
| |
| cpu_x86_load_seg_cache(env, R_CS, new_cs, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), |
| e2); |
| cpu_x86_load_seg_cache(env, R_SS, new_ss, |
| get_seg_base(ss_e1, ss_e2), |
| get_seg_limit(ss_e1, ss_e2), |
| ss_e2); |
| cpu_x86_set_cpl(env, rpl); |
| } |
| if (env->segs[R_SS].flags & DESC_B_MASK) |
| ESP = new_esp; |
| else |
| ESP = (ESP & 0xffff0000) | |
| (new_esp & 0xffff); |
| env->eip = new_eip; |
| if (is_iret) { |
| /* NOTE: 'cpl' can be different from the current CPL */ |
| if (cpl == 0) |
| eflags_mask = FL_UPDATE_CPL0_MASK; |
| else |
| eflags_mask = FL_UPDATE_MASK32; |
| if (shift == 0) |
| eflags_mask &= 0xffff; |
| load_eflags(new_eflags, eflags_mask); |
| } |
| return; |
| |
| return_to_vm86: |
| new_esp = ldl_kernel(ssp + 12); |
| new_ss = ldl_kernel(ssp + 16); |
| new_es = ldl_kernel(ssp + 20); |
| new_ds = ldl_kernel(ssp + 24); |
| new_fs = ldl_kernel(ssp + 28); |
| new_gs = ldl_kernel(ssp + 32); |
| |
| /* modify processor state */ |
| load_eflags(new_eflags, FL_UPDATE_CPL0_MASK | VM_MASK | VIF_MASK | VIP_MASK); |
| load_seg_vm(R_CS, new_cs); |
| cpu_x86_set_cpl(env, 3); |
| load_seg_vm(R_SS, new_ss); |
| load_seg_vm(R_ES, new_es); |
| load_seg_vm(R_DS, new_ds); |
| load_seg_vm(R_FS, new_fs); |
| load_seg_vm(R_GS, new_gs); |
| |
| env->eip = new_eip; |
| ESP = new_esp; |
| } |
| |
| void helper_iret_protected(int shift) |
| { |
| helper_ret_protected(shift, 1, 0); |
| } |
| |
| void helper_lret_protected(int shift, int addend) |
| { |
| helper_ret_protected(shift, 0, addend); |
| } |
| |
| void helper_movl_crN_T0(int reg) |
| { |
| env->cr[reg] = T0; |
| switch(reg) { |
| case 0: |
| cpu_x86_update_cr0(env); |
| break; |
| case 3: |
| cpu_x86_update_cr3(env); |
| break; |
| } |
| } |
| |
| /* XXX: do more */ |
| void helper_movl_drN_T0(int reg) |
| { |
| env->dr[reg] = T0; |
| } |
| |
| void helper_invlpg(unsigned int addr) |
| { |
| cpu_x86_flush_tlb(env, addr); |
| } |
| |
| /* rdtsc */ |
| #ifndef __i386__ |
| uint64_t emu_time; |
| #endif |
| |
| void helper_rdtsc(void) |
| { |
| uint64_t val; |
| #ifdef __i386__ |
| asm("rdtsc" : "=A" (val)); |
| #else |
| /* better than nothing: the time increases */ |
| val = emu_time++; |
| #endif |
| EAX = val; |
| EDX = val >> 32; |
| } |
| |
| void helper_wrmsr(void) |
| { |
| switch(ECX) { |
| case MSR_IA32_SYSENTER_CS: |
| env->sysenter_cs = EAX & 0xffff; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| env->sysenter_esp = EAX; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| env->sysenter_eip = EAX; |
| break; |
| default: |
| /* XXX: exception ? */ |
| break; |
| } |
| } |
| |
| void helper_rdmsr(void) |
| { |
| switch(ECX) { |
| case MSR_IA32_SYSENTER_CS: |
| EAX = env->sysenter_cs; |
| EDX = 0; |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| EAX = env->sysenter_esp; |
| EDX = 0; |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| EAX = env->sysenter_eip; |
| EDX = 0; |
| break; |
| default: |
| /* XXX: exception ? */ |
| break; |
| } |
| } |
| |
| void helper_lsl(void) |
| { |
| unsigned int selector, limit; |
| uint32_t e1, e2; |
| |
| CC_SRC = cc_table[CC_OP].compute_all() & ~CC_Z; |
| selector = T0 & 0xffff; |
| if (load_segment(&e1, &e2, selector) != 0) |
| return; |
| limit = (e1 & 0xffff) | (e2 & 0x000f0000); |
| if (e2 & (1 << 23)) |
| limit = (limit << 12) | 0xfff; |
| T1 = limit; |
| CC_SRC |= CC_Z; |
| } |
| |
| void helper_lar(void) |
| { |
| unsigned int selector; |
| uint32_t e1, e2; |
| |
| CC_SRC = cc_table[CC_OP].compute_all() & ~CC_Z; |
| selector = T0 & 0xffff; |
| if (load_segment(&e1, &e2, selector) != 0) |
| return; |
| T1 = e2 & 0x00f0ff00; |
| CC_SRC |= CC_Z; |
| } |
| |
| /* FPU helpers */ |
| |
| #ifndef USE_X86LDOUBLE |
| void helper_fldt_ST0_A0(void) |
| { |
| int new_fpstt; |
| new_fpstt = (env->fpstt - 1) & 7; |
| env->fpregs[new_fpstt] = helper_fldt((uint8_t *)A0); |
| env->fpstt = new_fpstt; |
| env->fptags[new_fpstt] = 0; /* validate stack entry */ |
| } |
| |
| void helper_fstt_ST0_A0(void) |
| { |
| helper_fstt(ST0, (uint8_t *)A0); |
| } |
| #endif |
| |
| /* BCD ops */ |
| |
| #define MUL10(iv) ( iv + iv + (iv << 3) ) |
| |
| void helper_fbld_ST0_A0(void) |
| { |
| CPU86_LDouble tmp; |
| uint64_t val; |
| unsigned int v; |
| int i; |
| |
| val = 0; |
| for(i = 8; i >= 0; i--) { |
| v = ldub((uint8_t *)A0 + i); |
| val = (val * 100) + ((v >> 4) * 10) + (v & 0xf); |
| } |
| tmp = val; |
| if (ldub((uint8_t *)A0 + 9) & 0x80) |
| tmp = -tmp; |
| fpush(); |
| ST0 = tmp; |
| } |
| |
| void helper_fbst_ST0_A0(void) |
| { |
| CPU86_LDouble tmp; |
| int v; |
| uint8_t *mem_ref, *mem_end; |
| int64_t val; |
| |
| tmp = rint(ST0); |
| val = (int64_t)tmp; |
| mem_ref = (uint8_t *)A0; |
| mem_end = mem_ref + 9; |
| if (val < 0) { |
| stb(mem_end, 0x80); |
| val = -val; |
| } else { |
| stb(mem_end, 0x00); |
| } |
| while (mem_ref < mem_end) { |
| if (val == 0) |
| break; |
| v = val % 100; |
| val = val / 100; |
| v = ((v / 10) << 4) | (v % 10); |
| stb(mem_ref++, v); |
| } |
| while (mem_ref < mem_end) { |
| stb(mem_ref++, 0); |
| } |
| } |
| |
| void helper_f2xm1(void) |
| { |
| ST0 = pow(2.0,ST0) - 1.0; |
| } |
| |
| void helper_fyl2x(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if (fptemp>0.0){ |
| fptemp = log(fptemp)/log(2.0); /* log2(ST) */ |
| ST1 *= fptemp; |
| fpop(); |
| } else { |
| env->fpus &= (~0x4700); |
| env->fpus |= 0x400; |
| } |
| } |
| |
| void helper_fptan(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if((fptemp > MAXTAN)||(fptemp < -MAXTAN)) { |
| env->fpus |= 0x400; |
| } else { |
| ST0 = tan(fptemp); |
| fpush(); |
| ST0 = 1.0; |
| env->fpus &= (~0x400); /* C2 <-- 0 */ |
| /* the above code is for |arg| < 2**52 only */ |
| } |
| } |
| |
| void helper_fpatan(void) |
| { |
| CPU86_LDouble fptemp, fpsrcop; |
| |
| fpsrcop = ST1; |
| fptemp = ST0; |
| ST1 = atan2(fpsrcop,fptemp); |
| fpop(); |
| } |
| |
| void helper_fxtract(void) |
| { |
| CPU86_LDoubleU temp; |
| unsigned int expdif; |
| |
| temp.d = ST0; |
| expdif = EXPD(temp) - EXPBIAS; |
| /*DP exponent bias*/ |
| ST0 = expdif; |
| fpush(); |
| BIASEXPONENT(temp); |
| ST0 = temp.d; |
| } |
| |
| void helper_fprem1(void) |
| { |
| CPU86_LDouble dblq, fpsrcop, fptemp; |
| CPU86_LDoubleU fpsrcop1, fptemp1; |
| int expdif; |
| int q; |
| |
| fpsrcop = ST0; |
| fptemp = ST1; |
| fpsrcop1.d = fpsrcop; |
| fptemp1.d = fptemp; |
| expdif = EXPD(fpsrcop1) - EXPD(fptemp1); |
| if (expdif < 53) { |
| dblq = fpsrcop / fptemp; |
| dblq = (dblq < 0.0)? ceil(dblq): floor(dblq); |
| ST0 = fpsrcop - fptemp*dblq; |
| q = (int)dblq; /* cutting off top bits is assumed here */ |
| env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */ |
| /* (C0,C1,C3) <-- (q2,q1,q0) */ |
| env->fpus |= (q&0x4) << 6; /* (C0) <-- q2 */ |
| env->fpus |= (q&0x2) << 8; /* (C1) <-- q1 */ |
| env->fpus |= (q&0x1) << 14; /* (C3) <-- q0 */ |
| } else { |
| env->fpus |= 0x400; /* C2 <-- 1 */ |
| fptemp = pow(2.0, expdif-50); |
| fpsrcop = (ST0 / ST1) / fptemp; |
| /* fpsrcop = integer obtained by rounding to the nearest */ |
| fpsrcop = (fpsrcop-floor(fpsrcop) < ceil(fpsrcop)-fpsrcop)? |
| floor(fpsrcop): ceil(fpsrcop); |
| ST0 -= (ST1 * fpsrcop * fptemp); |
| } |
| } |
| |
| void helper_fprem(void) |
| { |
| CPU86_LDouble dblq, fpsrcop, fptemp; |
| CPU86_LDoubleU fpsrcop1, fptemp1; |
| int expdif; |
| int q; |
| |
| fpsrcop = ST0; |
| fptemp = ST1; |
| fpsrcop1.d = fpsrcop; |
| fptemp1.d = fptemp; |
| expdif = EXPD(fpsrcop1) - EXPD(fptemp1); |
| if ( expdif < 53 ) { |
| dblq = fpsrcop / fptemp; |
| dblq = (dblq < 0.0)? ceil(dblq): floor(dblq); |
| ST0 = fpsrcop - fptemp*dblq; |
| q = (int)dblq; /* cutting off top bits is assumed here */ |
| env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */ |
| /* (C0,C1,C3) <-- (q2,q1,q0) */ |
| env->fpus |= (q&0x4) << 6; /* (C0) <-- q2 */ |
| env->fpus |= (q&0x2) << 8; /* (C1) <-- q1 */ |
| env->fpus |= (q&0x1) << 14; /* (C3) <-- q0 */ |
| } else { |
| env->fpus |= 0x400; /* C2 <-- 1 */ |
| fptemp = pow(2.0, expdif-50); |
| fpsrcop = (ST0 / ST1) / fptemp; |
| /* fpsrcop = integer obtained by chopping */ |
| fpsrcop = (fpsrcop < 0.0)? |
| -(floor(fabs(fpsrcop))): floor(fpsrcop); |
| ST0 -= (ST1 * fpsrcop * fptemp); |
| } |
| } |
| |
| void helper_fyl2xp1(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if ((fptemp+1.0)>0.0) { |
| fptemp = log(fptemp+1.0) / log(2.0); /* log2(ST+1.0) */ |
| ST1 *= fptemp; |
| fpop(); |
| } else { |
| env->fpus &= (~0x4700); |
| env->fpus |= 0x400; |
| } |
| } |
| |
| void helper_fsqrt(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if (fptemp<0.0) { |
| env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */ |
| env->fpus |= 0x400; |
| } |
| ST0 = sqrt(fptemp); |
| } |
| |
| void helper_fsincos(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if ((fptemp > MAXTAN)||(fptemp < -MAXTAN)) { |
| env->fpus |= 0x400; |
| } else { |
| ST0 = sin(fptemp); |
| fpush(); |
| ST0 = cos(fptemp); |
| env->fpus &= (~0x400); /* C2 <-- 0 */ |
| /* the above code is for |arg| < 2**63 only */ |
| } |
| } |
| |
| void helper_frndint(void) |
| { |
| CPU86_LDouble a; |
| |
| a = ST0; |
| #ifdef __arm__ |
| switch(env->fpuc & RC_MASK) { |
| default: |
| case RC_NEAR: |
| asm("rndd %0, %1" : "=f" (a) : "f"(a)); |
| break; |
| case RC_DOWN: |
| asm("rnddm %0, %1" : "=f" (a) : "f"(a)); |
| break; |
| case RC_UP: |
| asm("rnddp %0, %1" : "=f" (a) : "f"(a)); |
| break; |
| case RC_CHOP: |
| asm("rnddz %0, %1" : "=f" (a) : "f"(a)); |
| break; |
| } |
| #else |
| a = rint(a); |
| #endif |
| ST0 = a; |
| } |
| |
| void helper_fscale(void) |
| { |
| CPU86_LDouble fpsrcop, fptemp; |
| |
| fpsrcop = 2.0; |
| fptemp = pow(fpsrcop,ST1); |
| ST0 *= fptemp; |
| } |
| |
| void helper_fsin(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if ((fptemp > MAXTAN)||(fptemp < -MAXTAN)) { |
| env->fpus |= 0x400; |
| } else { |
| ST0 = sin(fptemp); |
| env->fpus &= (~0x400); /* C2 <-- 0 */ |
| /* the above code is for |arg| < 2**53 only */ |
| } |
| } |
| |
| void helper_fcos(void) |
| { |
| CPU86_LDouble fptemp; |
| |
| fptemp = ST0; |
| if((fptemp > MAXTAN)||(fptemp < -MAXTAN)) { |
| env->fpus |= 0x400; |
| } else { |
| ST0 = cos(fptemp); |
| env->fpus &= (~0x400); /* C2 <-- 0 */ |
| /* the above code is for |arg5 < 2**63 only */ |
| } |
| } |
| |
| void helper_fxam_ST0(void) |
| { |
| CPU86_LDoubleU temp; |
| int expdif; |
| |
| temp.d = ST0; |
| |
| env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */ |
| if (SIGND(temp)) |
| env->fpus |= 0x200; /* C1 <-- 1 */ |
| |
| expdif = EXPD(temp); |
| if (expdif == MAXEXPD) { |
| if (MANTD(temp) == 0) |
| env->fpus |= 0x500 /*Infinity*/; |
| else |
| env->fpus |= 0x100 /*NaN*/; |
| } else if (expdif == 0) { |
| if (MANTD(temp) == 0) |
| env->fpus |= 0x4000 /*Zero*/; |
| else |
| env->fpus |= 0x4400 /*Denormal*/; |
| } else { |
| env->fpus |= 0x400; |
| } |
| } |
| |
| void helper_fstenv(uint8_t *ptr, int data32) |
| { |
| int fpus, fptag, exp, i; |
| uint64_t mant; |
| CPU86_LDoubleU tmp; |
| |
| fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
| fptag = 0; |
| for (i=7; i>=0; i--) { |
| fptag <<= 2; |
| if (env->fptags[i]) { |
| fptag |= 3; |
| } else { |
| tmp.d = env->fpregs[i]; |
| exp = EXPD(tmp); |
| mant = MANTD(tmp); |
| if (exp == 0 && mant == 0) { |
| /* zero */ |
| fptag |= 1; |
| } else if (exp == 0 || exp == MAXEXPD |
| #ifdef USE_X86LDOUBLE |
| || (mant & (1LL << 63)) == 0 |
| #endif |
| ) { |
| /* NaNs, infinity, denormal */ |
| fptag |= 2; |
| } |
| } |
| } |
| if (data32) { |
| /* 32 bit */ |
| stl(ptr, env->fpuc); |
| stl(ptr + 4, fpus); |
| stl(ptr + 8, fptag); |
| stl(ptr + 12, 0); |
| stl(ptr + 16, 0); |
| stl(ptr + 20, 0); |
| stl(ptr + 24, 0); |
| } else { |
| /* 16 bit */ |
| stw(ptr, env->fpuc); |
| stw(ptr + 2, fpus); |
| stw(ptr + 4, fptag); |
| stw(ptr + 6, 0); |
| stw(ptr + 8, 0); |
| stw(ptr + 10, 0); |
| stw(ptr + 12, 0); |
| } |
| } |
| |
| void helper_fldenv(uint8_t *ptr, int data32) |
| { |
| int i, fpus, fptag; |
| |
| if (data32) { |
| env->fpuc = lduw(ptr); |
| fpus = lduw(ptr + 4); |
| fptag = lduw(ptr + 8); |
| } |
| else { |
| env->fpuc = lduw(ptr); |
| fpus = lduw(ptr + 2); |
| fptag = lduw(ptr + 4); |
| } |
| env->fpstt = (fpus >> 11) & 7; |
| env->fpus = fpus & ~0x3800; |
| for(i = 0;i < 7; i++) { |
| env->fptags[i] = ((fptag & 3) == 3); |
| fptag >>= 2; |
| } |
| } |
| |
| void helper_fsave(uint8_t *ptr, int data32) |
| { |
| CPU86_LDouble tmp; |
| int i; |
| |
| helper_fstenv(ptr, data32); |
| |
| ptr += (14 << data32); |
| for(i = 0;i < 8; i++) { |
| tmp = ST(i); |
| #ifdef USE_X86LDOUBLE |
| *(long double *)ptr = tmp; |
| #else |
| helper_fstt(tmp, ptr); |
| #endif |
| ptr += 10; |
| } |
| |
| /* fninit */ |
| env->fpus = 0; |
| env->fpstt = 0; |
| env->fpuc = 0x37f; |
| env->fptags[0] = 1; |
| env->fptags[1] = 1; |
| env->fptags[2] = 1; |
| env->fptags[3] = 1; |
| env->fptags[4] = 1; |
| env->fptags[5] = 1; |
| env->fptags[6] = 1; |
| env->fptags[7] = 1; |
| } |
| |
| void helper_frstor(uint8_t *ptr, int data32) |
| { |
| CPU86_LDouble tmp; |
| int i; |
| |
| helper_fldenv(ptr, data32); |
| ptr += (14 << data32); |
| |
| for(i = 0;i < 8; i++) { |
| #ifdef USE_X86LDOUBLE |
| tmp = *(long double *)ptr; |
| #else |
| tmp = helper_fldt(ptr); |
| #endif |
| ST(i) = tmp; |
| ptr += 10; |
| } |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| |
| #define MMUSUFFIX _mmu |
| #define GETPC() (__builtin_return_address(0)) |
| |
| #define SHIFT 0 |
| #include "softmmu_template.h" |
| |
| #define SHIFT 1 |
| #include "softmmu_template.h" |
| |
| #define SHIFT 2 |
| #include "softmmu_template.h" |
| |
| #define SHIFT 3 |
| #include "softmmu_template.h" |
| |
| #endif |
| |
| /* try to fill the TLB and return an exception if error. If retaddr is |
| NULL, it means that the function was called in C code (i.e. not |
| from generated code or from helper.c) */ |
| /* XXX: fix it to restore all registers */ |
| void tlb_fill(unsigned long addr, int is_write, int is_user, void *retaddr) |
| { |
| TranslationBlock *tb; |
| int ret; |
| unsigned long pc; |
| CPUX86State *saved_env; |
| |
| /* XXX: hack to restore env in all cases, even if not called from |
| generated code */ |
| saved_env = env; |
| env = cpu_single_env; |
| if (is_write && page_unprotect(addr)) { |
| /* nothing more to do: the page was write protected because |
| there was code in it. page_unprotect() flushed the code. */ |
| } |
| |
| ret = cpu_x86_handle_mmu_fault(env, addr, is_write, is_user, 1); |
| if (ret) { |
| if (retaddr) { |
| /* now we have a real cpu fault */ |
| pc = (unsigned long)retaddr; |
| tb = tb_find_pc(pc); |
| if (tb) { |
| /* the PC is inside the translated code. It means that we have |
| a virtual CPU fault */ |
| cpu_restore_state(tb, env, pc); |
| } |
| } |
| raise_exception_err(EXCP0E_PAGE, env->error_code); |
| } |
| env = saved_env; |
| } |
