/* * 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" //#define DEBUG_PCALL #if 0 #define raise_exception_err(a, b)\ do {\ fprintf(logfile, "raise_exception line=%d\n", __LINE__);\ (raise_exception_err)(a, b);\ } while (0) #endif 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 */ regs_to_env(); longjmp(env->jmp_env, 1); } /* 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); } 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;itr.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); } } /* XXX: merge with load_seg() */ static void tss_load_seg(int seg_reg, int selector) { uint32_t e1, e2; int rpl, dpl, cpl; if ((selector & 0xfffc) != 0) { if (load_segment(&e1, &e2, selector) != 0) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); if (!(e2 & DESC_S_MASK)) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); rpl = selector & 3; dpl = (e2 >> DESC_DPL_SHIFT) & 3; cpl = env->hflags & HF_CPL_MASK; if (seg_reg == R_CS) { if (!(e2 & DESC_CS_MASK)) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); if (dpl != rpl) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); if ((e2 & DESC_C_MASK) && dpl > rpl) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); } else if (seg_reg == R_SS) { /* SS must be writable data */ if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); if (dpl != cpl || dpl != rpl) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); } else { /* not readable code */ if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK)) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); /* if data or non conforming code, checks the rights */ if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) { if (dpl < cpl || dpl < rpl) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); } } if (!(e2 & DESC_P_MASK)) 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); } else { if (seg_reg == R_SS || seg_reg == R_CS) raise_exception_err(EXCP0A_TSS, selector & 0xfffc); } } #define SWITCH_TSS_JMP 0 #define SWITCH_TSS_IRET 1 #define SWITCH_TSS_CALL 2 /* XXX: restore CPU state in registers (PowerPC case) */ static void switch_tss(int tss_selector, uint32_t e1, uint32_t e2, int source, uint32_t next_eip) { int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i; uint8_t *tss_base; uint32_t new_regs[8], new_segs[6]; uint32_t new_eflags, new_eip, new_cr3, new_ldt, new_trap; uint32_t old_eflags, eflags_mask; SegmentCache *dt; int index; uint8_t *ptr; type = (e2 >> DESC_TYPE_SHIFT) & 0xf; #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_PCALL) fprintf(logfile, "switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type, source); #endif /* if task gate, we read the TSS segment and we load it */ if (type == 5) { if (!(e2 & DESC_P_MASK)) raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc); tss_selector = e1 >> 16; if (tss_selector & 4) raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc); if (load_segment(&e1, &e2, tss_selector) != 0) raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc); if (e2 & DESC_S_MASK) raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc); type = (e2 >> DESC_TYPE_SHIFT) & 0xf; if ((type & 7) != 1) raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc); } if (!(e2 & DESC_P_MASK)) raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc); if (type & 8) tss_limit_max = 103; else tss_limit_max = 43; tss_limit = get_seg_limit(e1, e2); tss_base = get_seg_base(e1, e2); if ((tss_selector & 4) != 0 || tss_limit < tss_limit_max) raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc); old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; if (old_type & 8) old_tss_limit_max = 103; else old_tss_limit_max = 43; /* read all the registers from the new TSS */ if (type & 8) { /* 32 bit */ new_cr3 = ldl_kernel(tss_base + 0x1c); new_eip = ldl_kernel(tss_base + 0x20); new_eflags = ldl_kernel(tss_base + 0x24); for(i = 0; i < 8; i++) new_regs[i] = ldl_kernel(tss_base + (0x28 + i * 4)); for(i = 0; i < 6; i++) new_segs[i] = lduw_kernel(tss_base + (0x48 + i * 4)); new_ldt = lduw_kernel(tss_base + 0x60); new_trap = ldl_kernel(tss_base + 0x64); } else { /* 16 bit */ new_cr3 = 0; new_eip = lduw_kernel(tss_base + 0x0e); new_eflags = lduw_kernel(tss_base + 0x10); for(i = 0; i < 8; i++) new_regs[i] = lduw_kernel(tss_base + (0x12 + i * 2)) | 0xffff0000; for(i = 0; i < 4; i++) new_segs[i] = lduw_kernel(tss_base + (0x22 + i * 4)); new_ldt = lduw_kernel(tss_base + 0x2a); new_segs[R_FS] = 0; new_segs[R_GS] = 0; new_trap = 0; } /* NOTE: we must avoid memory exceptions during the task switch, so we make dummy accesses before */ /* XXX: it can still fail in some cases, so a bigger hack is necessary to valid the TLB after having done the accesses */ v1 = ldub_kernel(env->tr.base); v2 = ldub(env->tr.base + old_tss_limit_max); stb_kernel(env->tr.base, v1); stb_kernel(env->tr.base + old_tss_limit_max, v2); /* clear busy bit (it is restartable) */ if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) { uint8_t *ptr; uint32_t e2; ptr = env->gdt.base + (env->tr.selector & ~7); e2 = ldl_kernel(ptr + 4); e2 &= ~DESC_TSS_BUSY_MASK; stl_kernel(ptr + 4, e2); } old_eflags = compute_eflags(); if (source == SWITCH_TSS_IRET) old_eflags &= ~NT_MASK; /* save the current state in the old TSS */ if (type & 8) { /* 32 bit */ stl_kernel(env->tr.base + 0x20, next_eip); stl_kernel(env->tr.base + 0x24, old_eflags); stl_kernel(env->tr.base + (0x28 + 0 * 4), EAX); stl_kernel(env->tr.base + (0x28 + 1 * 4), ECX); stl_kernel(env->tr.base + (0x28 + 2 * 4), EDX); stl_kernel(env->tr.base + (0x28 + 3 * 4), EBX); stl_kernel(env->tr.base + (0x28 + 4 * 4), ESP); stl_kernel(env->tr.base + (0x28 + 5 * 4), EBP); stl_kernel(env->tr.base + (0x28 + 6 * 4), ESI); stl_kernel(env->tr.base + (0x28 + 7 * 4), EDI); for(i = 0; i < 6; i++) stw_kernel(env->tr.base + (0x48 + i * 4), env->segs[i].selector); } else { /* 16 bit */ stw_kernel(env->tr.base + 0x0e, next_eip); stw_kernel(env->tr.base + 0x10, old_eflags); stw_kernel(env->tr.base + (0x12 + 0 * 2), EAX); stw_kernel(env->tr.base + (0x12 + 1 * 2), ECX); stw_kernel(env->tr.base + (0x12 + 2 * 2), EDX); stw_kernel(env->tr.base + (0x12 + 3 * 2), EBX); stw_kernel(env->tr.base + (0x12 + 4 * 2), ESP); stw_kernel(env->tr.base + (0x12 + 5 * 2), EBP); stw_kernel(env->tr.base + (0x12 + 6 * 2), ESI); stw_kernel(env->tr.base + (0x12 + 7 * 2), EDI); for(i = 0; i < 4; i++) stw_kernel(env->tr.base + (0x22 + i * 4), env->segs[i].selector); } /* now if an exception occurs, it will occurs in the next task context */ if (source == SWITCH_TSS_CALL) { stw_kernel(tss_base, env->tr.selector); new_eflags |= NT_MASK; } /* set busy bit */ if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) { uint8_t *ptr; uint32_t e2; ptr = env->gdt.base + (tss_selector & ~7); e2 = ldl_kernel(ptr + 4); e2 |= DESC_TSS_BUSY_MASK; stl_kernel(ptr + 4, e2); } /* set the new CPU state */ /* from this point, any exception which occurs can give problems */ env->cr[0] |= CR0_TS_MASK; env->hflags |= HF_TS_MASK; env->tr.selector = tss_selector; env->tr.base = tss_base; env->tr.limit = tss_limit; env->tr.flags = e2 & ~DESC_TSS_BUSY_MASK; if ((type & 8) && (env->cr[0] & CR0_PG_MASK)) { cpu_x86_update_cr3(env, new_cr3); } /* load all registers without an exception, then reload them with possible exception */ env->eip = new_eip; eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK; if (!(type & 8)) eflags_mask &= 0xffff; load_eflags(new_eflags, eflags_mask); /* XXX: what to do in 16 bit case ? */ EAX = new_regs[0]; ECX = new_regs[1]; EDX = new_regs[2]; EBX = new_regs[3]; ESP = new_regs[4]; EBP = new_regs[5]; ESI = new_regs[6]; EDI = new_regs[7]; if (new_eflags & VM_MASK) { for(i = 0; i < 6; i++) load_seg_vm(i, new_segs[i]); /* in vm86, CPL is always 3 */ cpu_x86_set_cpl(env, 3); } else { /* CPL is set the RPL of CS */ cpu_x86_set_cpl(env, new_segs[R_CS] & 3); /* first just selectors as the rest may trigger exceptions */ for(i = 0; i < 6; i++) cpu_x86_load_seg_cache(env, i, new_segs[i], NULL, 0, 0); } env->ldt.selector = new_ldt & ~4; env->ldt.base = NULL; env->ldt.limit = 0; env->ldt.flags = 0; /* load the LDT */ if (new_ldt & 4) raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc); if ((new_ldt & 0xfffc) != 0) { dt = &env->gdt; index = new_ldt & ~7; if ((index + 7) > dt->limit) raise_exception_err(EXCP0A_TSS, new_ldt & 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(EXCP0A_TSS, new_ldt & 0xfffc); if (!(e2 & DESC_P_MASK)) raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc); load_seg_cache_raw_dt(&env->ldt, e1, e2); } /* load the segments */ if (!(new_eflags & VM_MASK)) { tss_load_seg(R_CS, new_segs[R_CS]); tss_load_seg(R_SS, new_segs[R_SS]); tss_load_seg(R_ES, new_segs[R_ES]); tss_load_seg(R_DS, new_segs[R_DS]); tss_load_seg(R_FS, new_segs[R_FS]); tss_load_seg(R_GS, new_segs[R_GS]); } /* check that EIP is in the CS segment limits */ if (new_eip > env->segs[R_CS].limit) { /* XXX: different exception if CALL ? */ raise_exception_err(EXCP0D_GPF, 0); } } /* check if Port I/O is allowed in TSS */ static inline void check_io(int addr, int size) { int io_offset, val, mask; /* TSS must be a valid 32 bit one */ if (!(env->tr.flags & DESC_P_MASK) || ((env->tr.flags >> DESC_TYPE_SHIFT) & 0xf) != 9 || env->tr.limit < 103) goto fail; io_offset = lduw_kernel(env->tr.base + 0x66); io_offset += (addr >> 3); /* Note: the check needs two bytes */ if ((io_offset + 1) > env->tr.limit) goto fail; val = lduw_kernel(env->tr.base + io_offset); val >>= (addr & 7); mask = (1 << size) - 1; /* all bits must be zero to allow the I/O */ if ((val & mask) != 0) { fail: raise_exception_err(EXCP0D_GPF, 0); } } void check_iob_T0(void) { check_io(T0, 1); } void check_iow_T0(void) { check_io(T0, 2); } void check_iol_T0(void) { check_io(T0, 4); } void check_iob_DX(void) { check_io(EDX & 0xffff, 1); } void check_iow_DX(void) { check_io(EDX & 0xffff, 2); } void check_iol_DX(void) { check_io(EDX & 0xffff, 4); } static inline unsigned int get_sp_mask(unsigned int e2) { if (e2 & DESC_B_MASK) return 0xffffffff; else return 0xffff; } /* XXX: add a is_user flag to have proper security support */ #define PUSHW(ssp, sp, sp_mask, val)\ {\ sp -= 2;\ stw_kernel((ssp) + (sp & (sp_mask)), (val));\ } #define PUSHL(ssp, sp, sp_mask, val)\ {\ sp -= 4;\ stl_kernel((ssp) + (sp & (sp_mask)), (val));\ } #define POPW(ssp, sp, sp_mask, val)\ {\ val = lduw_kernel((ssp) + (sp & (sp_mask)));\ sp += 2;\ } #define POPL(ssp, sp, sp_mask, val)\ {\ val = ldl_kernel((ssp) + (sp & (sp_mask)));\ sp += 4;\ } /* 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, sp_mask; int has_error_code, new_stack, shift; uint32_t e1, e2, offset, ss, esp, ss_e1, ss_e2; uint32_t old_eip; 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; } } if (is_int) old_eip = next_eip; else old_eip = env->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 */ /* must do that check here to return the correct error code */ if (!(e2 & DESC_P_MASK)) raise_exception_err(EXCP0B_NOSEG, intno * 8 + 2); switch_tss(intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip); if (has_error_code) { int mask; /* push the error code */ shift = (env->segs[R_CS].flags >> DESC_B_SHIFT) & 1; if (env->segs[R_SS].flags & DESC_B_MASK) mask = 0xffffffff; else mask = 0xffff; esp = (ESP - (2 << shift)) & mask; ssp = env->segs[R_SS].base + esp; if (shift) stl_kernel(ssp, error_code); else stw_kernel(ssp, error_code); ESP = (esp & mask) | (ESP & ~mask); } return; 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; sp_mask = get_sp_mask(ss_e2); ssp = get_seg_base(ss_e1, ss_e2); } else if ((e2 & DESC_C_MASK) || dpl == cpl) { /* to same priviledge */ if (env->eflags & VM_MASK) raise_exception_err(EXCP0D_GPF, selector & 0xfffc); new_stack = 0; sp_mask = get_sp_mask(env->segs[R_SS].flags); ssp = env->segs[R_SS].base; esp = ESP; dpl = cpl; } else { raise_exception_err(EXCP0D_GPF, selector & 0xfffc); new_stack = 0; /* avoid warning */ sp_mask = 0; /* avoid warning */ ssp = NULL; /* avoid warning */ esp = 0; /* avoid warning */ } shift = type >> 3; #if 0 /* XXX: check that enough room is available */ push_size = 6 + (new_stack << 2) + (has_error_code << 1); if (env->eflags & VM_MASK) push_size += 8; push_size <<= shift; #endif if (shift == 1) { if (new_stack) { if (env->eflags & VM_MASK) { PUSHL(ssp, esp, sp_mask, env->segs[R_GS].selector); PUSHL(ssp, esp, sp_mask, env->segs[R_FS].selector); PUSHL(ssp, esp, sp_mask, env->segs[R_DS].selector); PUSHL(ssp, esp, sp_mask, env->segs[R_ES].selector); } PUSHL(ssp, esp, sp_mask, env->segs[R_SS].selector); PUSHL(ssp, esp, sp_mask, ESP); } PUSHL(ssp, esp, sp_mask, compute_eflags()); PUSHL(ssp, esp, sp_mask, env->segs[R_CS].selector); PUSHL(ssp, esp, sp_mask, old_eip); if (has_error_code) { PUSHL(ssp, esp, sp_mask, error_code); } } else { if (new_stack) { if (env->eflags & VM_MASK) { PUSHW(ssp, esp, sp_mask, env->segs[R_GS].selector); PUSHW(ssp, esp, sp_mask, env->segs[R_FS].selector); PUSHW(ssp, esp, sp_mask, env->segs[R_DS].selector); PUSHW(ssp, esp, sp_mask, env->segs[R_ES].selector); } PUSHW(ssp, esp, sp_mask, env->segs[R_SS].selector); PUSHW(ssp, esp, sp_mask, ESP); } PUSHW(ssp, esp, sp_mask, compute_eflags()); PUSHW(ssp, esp, sp_mask, env->segs[R_CS].selector); PUSHW(ssp, esp, sp_mask, old_eip); if (has_error_code) { PUSHW(ssp, esp, sp_mask, error_code); } } if (new_stack) { if (env->eflags & VM_MASK) { cpu_x86_load_seg_cache(env, R_ES, 0, NULL, 0, 0); cpu_x86_load_seg_cache(env, R_DS, 0, NULL, 0, 0); cpu_x86_load_seg_cache(env, R_FS, 0, NULL, 0, 0); cpu_x86_load_seg_cache(env, R_GS, 0, NULL, 0, 0); } ss = (ss & ~3) | dpl; cpu_x86_load_seg_cache(env, R_SS, ss, ssp, get_seg_limit(ss_e1, ss_e2), ss_e2); } ESP = (ESP & ~sp_mask) | (esp & sp_mask); 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; /* 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; /* XXX: use SS segment size ? */ PUSHW(ssp, esp, 0xffff, compute_eflags()); PUSHW(ssp, esp, 0xffff, old_cs); PUSHW(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 execution 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) { #ifdef DEBUG_PCALL if (loglevel & (CPU_LOG_PCALL | CPU_LOG_INT)) { if ((env->cr[0] & CR0_PE_MASK)) { static int count; fprintf(logfile, "%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:%08x pc=%08x SP=%04x:%08x", count, intno, error_code, is_int, env->hflags & HF_CPL_MASK, env->segs[R_CS].selector, EIP, (int)env->segs[R_CS].base + EIP, env->segs[R_SS].selector, ESP); if (intno == 0x0e) { fprintf(logfile, " CR2=%08x", env->cr[2]); } else { fprintf(logfile, " EAX=%08x", EAX); } fprintf(logfile, "\n"); #if 0 cpu_dump_state(env, logfile, fprintf, X86_DUMP_CCOP); { int i; uint8_t *ptr; fprintf(logfile, " code="); ptr = env->segs[R_CS].base + env->eip; for(i = 0; i < 16; i++) { fprintf(logfile, " %02x", ldub(ptr + i)); } fprintf(logfile, "\n"); } #endif count++; } } #endif 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(); } /* same as raise_exception_err, but do not restore global registers */ static void raise_exception_err_norestore(int exception_index, int error_code) { env->exception_index = exception_index; env->error_code = error_code; env->exception_is_int = 0; env->exception_next_eip = 0; longjmp(env->jmp_env, 1); } /* 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; } #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) { switch(EAX) { case 0: EAX = 2; /* max EAX index supported */ EBX = 0x756e6547; ECX = 0x6c65746e; EDX = 0x49656e69; break; case 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; } break; default: /* cache info: needed for Pentium Pro compatibility */ EAX = 0x410601; EBX = 0; ECX = 0; EDX = 0; break; } } 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 != 1 && 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 |= DESC_TSS_BUSY_MASK; stl_kernel(ptr + 4, e2); } env->tr.selector = selector; } /* only works if protected mode and not VM86. seg_reg must be != R_CS */ void load_seg(int seg_reg, int selector) { uint32_t e1, e2; int cpl, dpl, rpl; SegmentCache *dt; int index; uint8_t *ptr; selector &= 0xffff; if ((selector & 0xfffc) == 0) { /* null selector case */ if (seg_reg == R_SS) raise_exception_err(EXCP0D_GPF, 0); cpu_x86_load_seg_cache(env, seg_reg, selector, NULL, 0, 0); } else { if (selector & 0x4) dt = &env->ldt; else 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)) raise_exception_err(EXCP0D_GPF, selector & 0xfffc); rpl = selector & 3; dpl = (e2 >> DESC_DPL_SHIFT) & 3; cpl = env->hflags & HF_CPL_MASK; if (seg_reg == R_SS) { /* must be writable segment */ if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) raise_exception_err(EXCP0D_GPF, selector & 0xfffc); if (rpl != cpl || dpl != cpl) raise_exception_err(EXCP0D_GPF, selector & 0xfffc); } else { /* must be readable segment */ if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) raise_exception_err(EXCP0D_GPF, selector & 0xfffc); if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) { /* if not conforming code, test rights */ if (dpl < cpl || dpl < rpl) raise_exception_err(EXCP0D_GPF, selector & 0xfffc); } } if (!(e2 & DESC_P_MASK)) { if (seg_reg == R_SS) raise_exception_err(EXCP0C_STACK, selector & 0xfffc); else raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc); } /* set the access bit if not already set */ if (!(e2 & DESC_A_MASK)) { e2 |= DESC_A_MASK; stl_kernel(ptr + 4, e2); } 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(int next_eip) { int new_cs, new_eip, gate_cs, type; 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_C_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 { /* jump to call or task gate */ dpl = (e2 >> DESC_DPL_SHIFT) & 3; rpl = new_cs & 3; cpl = env->hflags & HF_CPL_MASK; type = (e2 >> DESC_TYPE_SHIFT) & 0xf; switch(type) { case 1: /* 286 TSS */ case 9: /* 386 TSS */ case 5: /* task gate */ if (dpl < cpl || dpl < rpl) raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); switch_tss(new_cs, e1, e2, SWITCH_TSS_JMP, next_eip); break; case 4: /* 286 call gate */ case 12: /* 386 call gate */ if ((dpl < cpl) || (dpl < rpl)) raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); if (!(e2 & DESC_P_MASK)) raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc); gate_cs = e1 >> 16; new_eip = (e1 & 0xffff); if (type == 12) new_eip |= (e2 & 0xffff0000); if (load_segment(&e1, &e2, gate_cs) != 0) raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc); dpl = (e2 >> DESC_DPL_SHIFT) & 3; /* must be code segment */ if (((e2 & (DESC_S_MASK | DESC_CS_MASK)) != (DESC_S_MASK | DESC_CS_MASK))) raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc); if (((e2 & DESC_C_MASK) && (dpl > cpl)) || (!(e2 & DESC_C_MASK) && (dpl != cpl))) raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc); if (!(e2 & DESC_P_MASK)) raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc); limit = get_seg_limit(e1, e2); if (new_eip > limit) raise_exception_err(EXCP0D_GPF, 0); cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl, get_seg_base(e1, e2), limit, e2); EIP = new_eip; break; default: raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); break; } } } /* 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 = get_sp_mask(env->segs[R_SS].flags); ssp = env->segs[R_SS].base; if (shift) { PUSHL(ssp, esp, esp_mask, env->segs[R_CS].selector); PUSHL(ssp, esp, esp_mask, next_eip); } else { PUSHW(ssp, esp, esp_mask, env->segs[R_CS].selector); PUSHW(ssp, esp, esp_mask, next_eip); } ESP = (ESP & ~esp_mask) | (esp & esp_mask); 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, new_stack, i; uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count; uint32_t ss, ss_e1, ss_e2, sp, type, ss_dpl, sp_mask; uint32_t val, limit, old_sp_mask; uint8_t *ssp, *old_ssp; new_cs = T0; new_eip = T1; #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_PCALL) { fprintf(logfile, "lcall %04x:%08x s=%d\n", new_cs, new_eip, shift); cpu_dump_state(env, logfile, fprintf, X86_DUMP_CCOP); } #endif 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; #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_PCALL) { fprintf(logfile, "desc=%08x:%08x\n", e1, e2); } #endif 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_C_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; sp_mask = get_sp_mask(env->segs[R_SS].flags); ssp = env->segs[R_SS].base; if (shift) { PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector); PUSHL(ssp, sp, sp_mask, next_eip); } else { PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector); PUSHW(ssp, sp, sp_mask, next_eip); } limit = get_seg_limit(e1, e2); if (new_eip > limit) raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); /* from this point, not restartable */ ESP = (ESP & ~sp_mask) | (sp & sp_mask); 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; dpl = (e2 >> DESC_DPL_SHIFT) & 3; rpl = new_cs & 3; switch(type) { case 1: /* available 286 TSS */ case 9: /* available 386 TSS */ case 5: /* task gate */ if (dpl < cpl || dpl < rpl) raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); switch_tss(new_cs, e1, e2, SWITCH_TSS_CALL, next_eip); return; case 4: /* 286 call gate */ case 12: /* 386 call gate */ break; default: raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc); break; } shift = type >> 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); param_count = e2 & 0x1f; 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); #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_PCALL) fprintf(logfile, "new ss:esp=%04x:%08x param_count=%d ESP=%x\n", ss, sp, param_count, ESP); #endif 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); // push_size = ((param_count * 2) + 8) << shift; old_sp_mask = get_sp_mask(env->segs[R_SS].flags); old_ssp = env->segs[R_SS].base; sp_mask = get_sp_mask(ss_e2); ssp = get_seg_base(ss_e1, ss_e2); if (shift) { PUSHL(ssp, sp, sp_mask, env->segs[R_SS].selector); PUSHL(ssp, sp, sp_mask, ESP); for(i = param_count - 1; i >= 0; i--) { val = ldl_kernel(old_ssp + ((ESP + i * 4) & old_sp_mask)); PUSHL(ssp, sp, sp_mask, val); } } else { PUSHW(ssp, sp, sp_mask, env->segs[R_SS].selector); PUSHW(ssp, sp, sp_mask, ESP); for(i = param_count - 1; i >= 0; i--) { val = lduw_kernel(old_ssp + ((ESP + i * 2) & old_sp_mask)); PUSHW(ssp, sp, sp_mask, val); } } new_stack = 1; } else { /* to same priviledge */ sp = ESP; sp_mask = get_sp_mask(env->segs[R_SS].flags); ssp = env->segs[R_SS].base; // push_size = (4 << shift); new_stack = 0; } if (shift) { PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector); PUSHL(ssp, sp, sp_mask, next_eip); } else { PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector); PUSHW(ssp, sp, sp_mask, next_eip); } /* from this point, not restartable */ if (new_stack) { ss = (ss & ~3) | dpl; cpu_x86_load_seg_cache(env, R_SS, ss, ssp, get_seg_limit(ss_e1, ss_e2), ss_e2); } 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); ESP = (ESP & ~sp_mask) | (sp & sp_mask); EIP = offset; } } /* real and vm86 mode iret */ void helper_iret_real(int shift) { uint32_t sp, new_cs, new_eip, new_eflags, sp_mask; uint8_t *ssp; int eflags_mask; sp_mask = 0xffff; /* XXXX: use SS segment size ? */ sp = ESP; ssp = env->segs[R_SS].base; if (shift == 1) { /* 32 bits */ POPL(ssp, sp, sp_mask, new_eip); POPL(ssp, sp, sp_mask, new_cs); new_cs &= 0xffff; POPL(ssp, sp, sp_mask, new_eflags); } else { /* 16 bits */ POPW(ssp, sp, sp_mask, new_eip); POPW(ssp, sp, sp_mask, new_cs); POPW(ssp, sp, sp_mask, new_eflags); } ESP = (ESP & ~sp_mask) | (sp & sp_mask); load_seg_vm(R_CS, new_cs); env->eip = new_eip; if (env->eflags & VM_MASK) eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK | NT_MASK; else eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | RF_MASK | NT_MASK; if (shift == 0) eflags_mask &= 0xffff; load_eflags(new_eflags, eflags_mask); } static inline void validate_seg(int seg_reg, int cpl) { int dpl; uint32_t e2; e2 = env->segs[seg_reg].flags; dpl = (e2 >> DESC_DPL_SHIFT) & 3; if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) { /* data or non conforming code segment */ if (dpl < cpl) { cpu_x86_load_seg_cache(env, seg_reg, 0, NULL, 0, 0); } } } /* 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, sp_mask; uint32_t new_es, new_ds, new_fs, new_gs; uint32_t e1, e2, ss_e1, ss_e2; int cpl, dpl, rpl, eflags_mask, iopl; uint8_t *ssp; sp_mask = get_sp_mask(env->segs[R_SS].flags); sp = ESP; ssp = env->segs[R_SS].base; new_eflags = 0; /* avoid warning */ if (shift == 1) { /* 32 bits */ POPL(ssp, sp, sp_mask, new_eip); POPL(ssp, sp, sp_mask, new_cs); new_cs &= 0xffff; if (is_iret) { POPL(ssp, sp, sp_mask, new_eflags); if (new_eflags & VM_MASK) goto return_to_vm86; } } else { /* 16 bits */ POPW(ssp, sp, sp_mask, new_eip); POPW(ssp, sp, sp_mask, new_cs); if (is_iret) POPW(ssp, sp, sp_mask, new_eflags); } #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_PCALL) { fprintf(logfile, "lret new %04x:%08x s=%d addend=0x%x\n", new_cs, new_eip, shift, addend); cpu_dump_state(env, logfile, fprintf, X86_DUMP_CCOP); } #endif 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_C_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); sp += addend; 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); } else { /* return to different priviledge level */ if (shift == 1) { /* 32 bits */ POPL(ssp, sp, sp_mask, new_esp); POPL(ssp, sp, sp_mask, new_ss); new_ss &= 0xffff; } else { /* 16 bits */ POPW(ssp, sp, sp_mask, new_esp); POPW(ssp, sp, sp_mask, new_ss); } #ifdef DEBUG_PCALL if (loglevel & CPU_LOG_PCALL) { fprintf(logfile, "new ss:esp=%04x:%08x\n", new_ss, new_esp); } #endif 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); sp = new_esp; sp_mask = get_sp_mask(ss_e2); /* validate data segments */ validate_seg(R_ES, cpl); validate_seg(R_DS, cpl); validate_seg(R_FS, cpl); validate_seg(R_GS, cpl); sp += addend; } ESP = (ESP & ~sp_mask) | (sp & sp_mask); env->eip = new_eip; if (is_iret) { /* NOTE: 'cpl' is the _old_ CPL */ eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK | NT_MASK; if (cpl == 0) eflags_mask |= IOPL_MASK; iopl = (env->eflags >> IOPL_SHIFT) & 3; if (cpl <= iopl) eflags_mask |= IF_MASK; if (shift == 0) eflags_mask &= 0xffff; load_eflags(new_eflags, eflags_mask); } return; return_to_vm86: POPL(ssp, sp, sp_mask, new_esp); POPL(ssp, sp, sp_mask, new_ss); POPL(ssp, sp, sp_mask, new_es); POPL(ssp, sp, sp_mask, new_ds); POPL(ssp, sp, sp_mask, new_fs); POPL(ssp, sp, sp_mask, new_gs); /* modify processor state */ load_eflags(new_eflags, TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK | VIP_MASK); load_seg_vm(R_CS, new_cs & 0xffff); cpu_x86_set_cpl(env, 3); load_seg_vm(R_SS, new_ss & 0xffff); load_seg_vm(R_ES, new_es & 0xffff); load_seg_vm(R_DS, new_ds & 0xffff); load_seg_vm(R_FS, new_fs & 0xffff); load_seg_vm(R_GS, new_gs & 0xffff); env->eip = new_eip & 0xffff; ESP = new_esp; } void helper_iret_protected(int shift, int next_eip) { int tss_selector, type; uint32_t e1, e2; /* specific case for TSS */ if (env->eflags & NT_MASK) { tss_selector = lduw_kernel(env->tr.base + 0); if (tss_selector & 4) raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc); if (load_segment(&e1, &e2, tss_selector) != 0) raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc); type = (e2 >> DESC_TYPE_SHIFT) & 0x17; /* NOTE: we check both segment and busy TSS */ if (type != 3) raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc); switch_tss(tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip); } else { helper_ret_protected(shift, 1, 0); } } void helper_lret_protected(int shift, int addend) { helper_ret_protected(shift, 0, addend); } void helper_sysenter(void) { if (env->sysenter_cs == 0) { raise_exception_err(EXCP0D_GPF, 0); } env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK); cpu_x86_set_cpl(env, 0); cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc, NULL, 0xffffffff, DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc, NULL, 0xffffffff, DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | DESC_A_MASK); ESP = env->sysenter_esp; EIP = env->sysenter_eip; } void helper_sysexit(void) { int cpl; cpl = env->hflags & HF_CPL_MASK; if (env->sysenter_cs == 0 || cpl != 0) { raise_exception_err(EXCP0D_GPF, 0); } cpu_x86_set_cpl(env, 3); cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) | 3, NULL, 0xffffffff, DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | (3 << DESC_DPL_SHIFT) | DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) | 3, NULL, 0xffffffff, DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | (3 << DESC_DPL_SHIFT) | DESC_W_MASK | DESC_A_MASK); ESP = ECX; EIP = EDX; } void helper_movl_crN_T0(int reg) { switch(reg) { case 0: cpu_x86_update_cr0(env, T0); break; case 3: cpu_x86_update_cr3(env, T0); break; case 4: cpu_x86_update_cr4(env, T0); break; default: env->cr[reg] = T0; 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); } void helper_rdtsc(void) { uint64_t val; val = cpu_get_tsc(env); 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; int rpl, dpl, cpl, type; CC_SRC = cc_table[CC_OP].compute_all() & ~CC_Z; selector = T0 & 0xffff; if (load_segment(&e1, &e2, selector) != 0) return; rpl = selector & 3; dpl = (e2 >> DESC_DPL_SHIFT) & 3; cpl = env->hflags & HF_CPL_MASK; if (e2 & DESC_S_MASK) { if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) { /* conforming */ } else { if (dpl < cpl || dpl < rpl) return; } } else { type = (e2 >> DESC_TYPE_SHIFT) & 0xf; switch(type) { case 1: case 2: case 3: case 9: case 11: break; default: return; } if (dpl < cpl || dpl < rpl) return; } limit = get_seg_limit(e1, e2); T1 = limit; CC_SRC |= CC_Z; } void helper_lar(void) { unsigned int selector; uint32_t e1, e2; int rpl, dpl, cpl, type; CC_SRC = cc_table[CC_OP].compute_all() & ~CC_Z; selector = T0 & 0xffff; if ((selector & 0xfffc) == 0) return; if (load_segment(&e1, &e2, selector) != 0) return; rpl = selector & 3; dpl = (e2 >> DESC_DPL_SHIFT) & 3; cpl = env->hflags & HF_CPL_MASK; if (e2 & DESC_S_MASK) { if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) { /* conforming */ } else { if (dpl < cpl || dpl < rpl) return; } } else { type = (e2 >> DESC_TYPE_SHIFT) & 0xf; switch(type) { case 1: case 2: case 3: case 4: case 5: case 9: case 11: case 12: break; default: return; } if (dpl < cpl || dpl < rpl) return; } T1 = e2 & 0x00f0ff00; CC_SRC |= CC_Z; } void helper_verr(void) { unsigned int selector; uint32_t e1, e2; int rpl, dpl, cpl; CC_SRC = cc_table[CC_OP].compute_all() & ~CC_Z; selector = T0 & 0xffff; if ((selector & 0xfffc) == 0) return; if (load_segment(&e1, &e2, selector) != 0) return; if (!(e2 & DESC_S_MASK)) return; rpl = selector & 3; dpl = (e2 >> DESC_DPL_SHIFT) & 3; cpl = env->hflags & HF_CPL_MASK; if (e2 & DESC_CS_MASK) { if (!(e2 & DESC_R_MASK)) return; if (!(e2 & DESC_C_MASK)) { if (dpl < cpl || dpl < rpl) return; } } else { if (dpl < cpl || dpl < rpl) return; } CC_SRC |= CC_Z; } void helper_verw(void) { unsigned int selector; uint32_t e1, e2; int rpl, dpl, cpl; CC_SRC = cc_table[CC_OP].compute_all() & ~CC_Z; selector = T0 & 0xffff; if ((selector & 0xfffc) == 0) return; if (load_segment(&e1, &e2, selector) != 0) return; if (!(e2 & DESC_S_MASK)) return; rpl = selector & 3; dpl = (e2 >> DESC_DPL_SHIFT) & 3; cpl = env->hflags & HF_CPL_MASK; if (e2 & DESC_CS_MASK) { return; } else { if (dpl < cpl || dpl < rpl) return; if (!(e2 & DESC_W_MASK)) return; } CC_SRC |= CC_Z; } /* FPU helpers */ 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); } void fpu_set_exception(int mask) { env->fpus |= mask; if (env->fpus & (~env->fpuc & FPUC_EM)) env->fpus |= FPUS_SE | FPUS_B; } CPU86_LDouble helper_fdiv(CPU86_LDouble a, CPU86_LDouble b) { if (b == 0.0) fpu_set_exception(FPUS_ZE); return a / b; } void fpu_raise_exception(void) { if (env->cr[0] & CR0_NE_MASK) { raise_exception(EXCP10_COPR); } #if !defined(CONFIG_USER_ONLY) else { cpu_set_ferr(env); } #endif } /* BCD ops */ 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); /* fpip */ stl(ptr + 16, 0); /* fpcs */ stl(ptr + 20, 0); /* fpoo */ stl(ptr + 24, 0); /* fpos */ } 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 < 8; 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); helper_fstt(tmp, ptr); 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++) { tmp = helper_fldt(ptr); ST(i) = tmp; ptr += 10; } } /* XXX: merge with helper_fstt ? */ #ifndef USE_X86LDOUBLE void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f) { CPU86_LDoubleU temp; int e; temp.d = f; /* mantissa */ *pmant = (MANTD(temp) << 11) | (1LL << 63); /* exponent + sign */ e = EXPD(temp) - EXPBIAS + 16383; e |= SIGND(temp) >> 16; *pexp = e; } CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper) { CPU86_LDoubleU temp; int e; uint64_t ll; /* XXX: handle overflow ? */ e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */ e |= (upper >> 4) & 0x800; /* sign */ ll = (mant >> 11) & ((1LL << 52) - 1); #ifdef __arm__ temp.l.upper = (e << 20) | (ll >> 32); temp.l.lower = ll; #else temp.ll = ll | ((uint64_t)e << 52); #endif return temp.d; } #else void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f) { CPU86_LDoubleU temp; temp.d = f; *pmant = temp.l.lower; *pexp = temp.l.upper; } CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper) { CPU86_LDoubleU temp; temp.l.upper = upper; temp.l.lower = mant; return temp.d; } #endif #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; 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, NULL); } } if (retaddr) raise_exception_err(EXCP0E_PAGE, env->error_code); else raise_exception_err_norestore(EXCP0E_PAGE, env->error_code); } env = saved_env; }