| /* |
| * x86 segmentation related helpers: |
| * TSS, interrupts, system calls, jumps and call/task gates, descriptors |
| * |
| * 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "cpu.h" |
| #include "qemu/log.h" |
| #include "helper.h" |
| |
| //#define DEBUG_PCALL |
| #if !defined(CONFIG_USER_ONLY) |
| #include "exec/softmmu_exec.h" |
| #endif /* !defined(CONFIG_USER_ONLY) */ |
| |
| |
| |
| #ifdef DEBUG_PCALL |
| # define LOG_PCALL(...) qemu_log_mask(CPU_LOG_PCALL, ## __VA_ARGS__) |
| # define LOG_PCALL_STATE(env) \ |
| log_cpu_state_mask(CPU_LOG_PCALL, (env), X86_DUMP_CCOP) |
| #else |
| # define LOG_PCALL(...) do { } while (0) |
| # define LOG_PCALL_STATE(env) do { } while (0) |
| #endif |
| |
| /* return non zero if error */ |
| static inline int load_segment(CPUX86State *env, uint32_t *e1_ptr, |
| uint32_t *e2_ptr, int selector) |
| { |
| SegmentCache *dt; |
| int index; |
| target_ulong 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 = cpu_ldl_kernel(env, ptr); |
| *e2_ptr = cpu_ldl_kernel(env, 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 uint32_t get_seg_base(uint32_t e1, uint32_t e2) |
| { |
| return (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(CPUX86State *env, int seg, int selector) |
| { |
| selector &= 0xffff; |
| cpu_x86_load_seg_cache(env, seg, selector, |
| (selector << 4), 0xffff, 0); |
| } |
| |
| static inline void get_ss_esp_from_tss(CPUX86State *env, uint32_t *ss_ptr, |
| uint32_t *esp_ptr, int dpl) |
| { |
| X86CPU *cpu = x86_env_get_cpu(env); |
| 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(CPU(cpu), "invalid tss"); |
| } |
| type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; |
| if ((type & 7) != 1) { |
| cpu_abort(CPU(cpu), "invalid tss type"); |
| } |
| shift = type >> 3; |
| index = (dpl * 4 + 2) << shift; |
| if (index + (4 << shift) - 1 > env->tr.limit) { |
| raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc); |
| } |
| if (shift == 0) { |
| *esp_ptr = cpu_lduw_kernel(env, env->tr.base + index); |
| *ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 2); |
| } else { |
| *esp_ptr = cpu_ldl_kernel(env, env->tr.base + index); |
| *ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 4); |
| } |
| } |
| |
| /* XXX: merge with load_seg() */ |
| static void tss_load_seg(CPUX86State *env, int seg_reg, int selector) |
| { |
| uint32_t e1, e2; |
| int rpl, dpl, cpl; |
| |
| if ((selector & 0xfffc) != 0) { |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_S_MASK)) { |
| raise_exception_err(env, 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(env, EXCP0A_TSS, selector & 0xfffc); |
| } |
| /* XXX: is it correct ? */ |
| if (dpl != rpl) { |
| raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc); |
| } |
| if ((e2 & DESC_C_MASK) && dpl > rpl) { |
| raise_exception_err(env, 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(env, EXCP0A_TSS, selector & 0xfffc); |
| } |
| if (dpl != cpl || dpl != rpl) { |
| raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc); |
| } |
| } else { |
| /* not readable code */ |
| if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK)) { |
| raise_exception_err(env, 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(env, EXCP0A_TSS, selector & 0xfffc); |
| } |
| } |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, 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(env, 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(CPUX86State *env, 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; |
| target_ulong tss_base; |
| uint32_t new_regs[8], new_segs[6]; |
| uint32_t new_eflags, new_eip, new_cr3, new_ldt; |
| uint32_t old_eflags, eflags_mask; |
| SegmentCache *dt; |
| int index; |
| target_ulong ptr; |
| |
| type = (e2 >> DESC_TYPE_SHIFT) & 0xf; |
| LOG_PCALL("switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type, |
| source); |
| |
| /* if task gate, we read the TSS segment and we load it */ |
| if (type == 5) { |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc); |
| } |
| tss_selector = e1 >> 16; |
| if (tss_selector & 4) { |
| raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc); |
| } |
| if (load_segment(env, &e1, &e2, tss_selector) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc); |
| } |
| if (e2 & DESC_S_MASK) { |
| raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc); |
| } |
| type = (e2 >> DESC_TYPE_SHIFT) & 0xf; |
| if ((type & 7) != 1) { |
| raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc); |
| } |
| } |
| |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, 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(env, 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 = cpu_ldl_kernel(env, tss_base + 0x1c); |
| new_eip = cpu_ldl_kernel(env, tss_base + 0x20); |
| new_eflags = cpu_ldl_kernel(env, tss_base + 0x24); |
| for (i = 0; i < 8; i++) { |
| new_regs[i] = cpu_ldl_kernel(env, tss_base + (0x28 + i * 4)); |
| } |
| for (i = 0; i < 6; i++) { |
| new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x48 + i * 4)); |
| } |
| new_ldt = cpu_lduw_kernel(env, tss_base + 0x60); |
| cpu_ldl_kernel(env, tss_base + 0x64); |
| } else { |
| /* 16 bit */ |
| new_cr3 = 0; |
| new_eip = cpu_lduw_kernel(env, tss_base + 0x0e); |
| new_eflags = cpu_lduw_kernel(env, tss_base + 0x10); |
| for (i = 0; i < 8; i++) { |
| new_regs[i] = cpu_lduw_kernel(env, tss_base + (0x12 + i * 2)) | |
| 0xffff0000; |
| } |
| for (i = 0; i < 4; i++) { |
| new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x22 + i * 4)); |
| } |
| new_ldt = cpu_lduw_kernel(env, tss_base + 0x2a); |
| new_segs[R_FS] = 0; |
| new_segs[R_GS] = 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 = cpu_ldub_kernel(env, env->tr.base); |
| v2 = cpu_ldub_kernel(env, env->tr.base + old_tss_limit_max); |
| cpu_stb_kernel(env, env->tr.base, v1); |
| cpu_stb_kernel(env, env->tr.base + old_tss_limit_max, v2); |
| |
| /* clear busy bit (it is restartable) */ |
| if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) { |
| target_ulong ptr; |
| uint32_t e2; |
| ptr = env->gdt.base + (env->tr.selector & ~7); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| e2 &= ~DESC_TSS_BUSY_MASK; |
| cpu_stl_kernel(env, ptr + 4, e2); |
| } |
| old_eflags = cpu_compute_eflags(env); |
| if (source == SWITCH_TSS_IRET) { |
| old_eflags &= ~NT_MASK; |
| } |
| |
| /* save the current state in the old TSS */ |
| if (type & 8) { |
| /* 32 bit */ |
| cpu_stl_kernel(env, env->tr.base + 0x20, next_eip); |
| cpu_stl_kernel(env, env->tr.base + 0x24, old_eflags); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 0 * 4), env->regs[R_EAX]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 1 * 4), env->regs[R_ECX]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 2 * 4), env->regs[R_EDX]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 3 * 4), env->regs[R_EBX]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 4 * 4), env->regs[R_ESP]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 5 * 4), env->regs[R_EBP]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 6 * 4), env->regs[R_ESI]); |
| cpu_stl_kernel(env, env->tr.base + (0x28 + 7 * 4), env->regs[R_EDI]); |
| for (i = 0; i < 6; i++) { |
| cpu_stw_kernel(env, env->tr.base + (0x48 + i * 4), |
| env->segs[i].selector); |
| } |
| } else { |
| /* 16 bit */ |
| cpu_stw_kernel(env, env->tr.base + 0x0e, next_eip); |
| cpu_stw_kernel(env, env->tr.base + 0x10, old_eflags); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 0 * 2), env->regs[R_EAX]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 1 * 2), env->regs[R_ECX]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 2 * 2), env->regs[R_EDX]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 3 * 2), env->regs[R_EBX]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 4 * 2), env->regs[R_ESP]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 5 * 2), env->regs[R_EBP]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 6 * 2), env->regs[R_ESI]); |
| cpu_stw_kernel(env, env->tr.base + (0x12 + 7 * 2), env->regs[R_EDI]); |
| for (i = 0; i < 4; i++) { |
| cpu_stw_kernel(env, 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) { |
| cpu_stw_kernel(env, tss_base, env->tr.selector); |
| new_eflags |= NT_MASK; |
| } |
| |
| /* set busy bit */ |
| if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) { |
| target_ulong ptr; |
| uint32_t e2; |
| ptr = env->gdt.base + (tss_selector & ~7); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| e2 |= DESC_TSS_BUSY_MASK; |
| cpu_stl_kernel(env, 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; |
| } |
| cpu_load_eflags(env, new_eflags, eflags_mask); |
| /* XXX: what to do in 16 bit case ? */ |
| env->regs[R_EAX] = new_regs[0]; |
| env->regs[R_ECX] = new_regs[1]; |
| env->regs[R_EDX] = new_regs[2]; |
| env->regs[R_EBX] = new_regs[3]; |
| env->regs[R_ESP] = new_regs[4]; |
| env->regs[R_EBP] = new_regs[5]; |
| env->regs[R_ESI] = new_regs[6]; |
| env->regs[R_EDI] = new_regs[7]; |
| if (new_eflags & VM_MASK) { |
| for (i = 0; i < 6; i++) { |
| load_seg_vm(env, 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], 0, 0, 0); |
| } |
| } |
| |
| env->ldt.selector = new_ldt & ~4; |
| env->ldt.base = 0; |
| env->ldt.limit = 0; |
| env->ldt.flags = 0; |
| |
| /* load the LDT */ |
| if (new_ldt & 4) { |
| raise_exception_err(env, 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(env, EXCP0A_TSS, new_ldt & 0xfffc); |
| } |
| ptr = dt->base + index; |
| e1 = cpu_ldl_kernel(env, ptr); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) { |
| raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, 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(env, R_CS, new_segs[R_CS]); |
| tss_load_seg(env, R_SS, new_segs[R_SS]); |
| tss_load_seg(env, R_ES, new_segs[R_ES]); |
| tss_load_seg(env, R_DS, new_segs[R_DS]); |
| tss_load_seg(env, R_FS, new_segs[R_FS]); |
| tss_load_seg(env, R_GS, new_segs[R_GS]); |
| } |
| |
| /* check that env->eip is in the CS segment limits */ |
| if (new_eip > env->segs[R_CS].limit) { |
| /* XXX: different exception if CALL ? */ |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| |
| #ifndef CONFIG_USER_ONLY |
| /* reset local breakpoints */ |
| if (env->dr[7] & 0x55) { |
| for (i = 0; i < 4; i++) { |
| if (hw_breakpoint_enabled(env->dr[7], i) == 0x1) { |
| hw_breakpoint_remove(env, i); |
| } |
| } |
| env->dr[7] &= ~0x55; |
| } |
| #endif |
| } |
| |
| static inline unsigned int get_sp_mask(unsigned int e2) |
| { |
| if (e2 & DESC_B_MASK) { |
| return 0xffffffff; |
| } else { |
| return 0xffff; |
| } |
| } |
| |
| static int exception_has_error_code(int intno) |
| { |
| switch(intno) { |
| case 8: |
| case 10: |
| case 11: |
| case 12: |
| case 13: |
| case 14: |
| case 17: |
| return 1; |
| } |
| return 0; |
| } |
| |
| #ifdef TARGET_X86_64 |
| #define SET_ESP(val, sp_mask)\ |
| do {\ |
| if ((sp_mask) == 0xffff) { \ |
| env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | \ |
| ((val) & 0xffff); \ |
| } else if ((sp_mask) == 0xffffffffLL) { \ |
| env->regs[R_ESP] = (uint32_t)(val); \ |
| } else { \ |
| env->regs[R_ESP] = (val); \ |
| } \ |
| } while (0) |
| #else |
| #define SET_ESP(val, sp_mask) \ |
| do { \ |
| env->regs[R_ESP] = (env->regs[R_ESP] & ~(sp_mask)) | \ |
| ((val) & (sp_mask)); \ |
| } while (0) |
| #endif |
| |
| /* in 64-bit machines, this can overflow. So this segment addition macro |
| * can be used to trim the value to 32-bit whenever needed */ |
| #define SEG_ADDL(ssp, sp, sp_mask) ((uint32_t)((ssp) + (sp & (sp_mask)))) |
| |
| /* XXX: add a is_user flag to have proper security support */ |
| #define PUSHW(ssp, sp, sp_mask, val)\ |
| {\ |
| sp -= 2;\ |
| cpu_stw_kernel(env, (ssp) + (sp & (sp_mask)), (val));\ |
| } |
| |
| #define PUSHL(ssp, sp, sp_mask, val)\ |
| {\ |
| sp -= 4;\ |
| cpu_stl_kernel(env, SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val));\ |
| } |
| |
| #define POPW(ssp, sp, sp_mask, val)\ |
| {\ |
| val = cpu_lduw_kernel(env, (ssp) + (sp & (sp_mask)));\ |
| sp += 2;\ |
| } |
| |
| #define POPL(ssp, sp, sp_mask, val)\ |
| {\ |
| val = (uint32_t)cpu_ldl_kernel(env, SEG_ADDL(ssp, sp, sp_mask));\ |
| sp += 4;\ |
| } |
| |
| /* protected mode interrupt */ |
| static void do_interrupt_protected(CPUX86State *env, int intno, int is_int, |
| int error_code, unsigned int next_eip, |
| int is_hw) |
| { |
| SegmentCache *dt; |
| target_ulong ptr, ssp; |
| int type, dpl, selector, ss_dpl, cpl; |
| int has_error_code, new_stack, shift; |
| uint32_t e1, e2, offset, ss = 0, esp, ss_e1 = 0, ss_e2 = 0; |
| uint32_t old_eip, sp_mask; |
| |
| has_error_code = 0; |
| if (!is_int && !is_hw) { |
| has_error_code = exception_has_error_code(intno); |
| } |
| if (is_int) { |
| old_eip = next_eip; |
| } else { |
| old_eip = env->eip; |
| } |
| |
| dt = &env->idt; |
| if (intno * 8 + 7 > dt->limit) { |
| raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2); |
| } |
| ptr = dt->base + intno * 8; |
| e1 = cpu_ldl_kernel(env, ptr); |
| e2 = cpu_ldl_kernel(env, 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(env, EXCP0B_NOSEG, intno * 8 + 2); |
| } |
| switch_tss(env, intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip); |
| if (has_error_code) { |
| int type; |
| uint32_t mask; |
| /* push the error code */ |
| type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; |
| shift = type >> 3; |
| if (env->segs[R_SS].flags & DESC_B_MASK) { |
| mask = 0xffffffff; |
| } else { |
| mask = 0xffff; |
| } |
| esp = (env->regs[R_ESP] - (2 << shift)) & mask; |
| ssp = env->segs[R_SS].base + esp; |
| if (shift) { |
| cpu_stl_kernel(env, ssp, error_code); |
| } else { |
| cpu_stw_kernel(env, ssp, error_code); |
| } |
| SET_ESP(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(env, EXCP0D_GPF, intno * 8 + 2); |
| break; |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| cpl = env->hflags & HF_CPL_MASK; |
| /* check privilege if software int */ |
| if (is_int && dpl < cpl) { |
| raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2); |
| } |
| /* check valid bit */ |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2); |
| } |
| selector = e1 >> 16; |
| offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff); |
| if ((selector & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| |
| } |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl > cpl) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_C_MASK) && dpl < cpl) { |
| /* to inner privilege */ |
| get_ss_esp_from_tss(env, &ss, &esp, dpl); |
| if ((ss & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if ((ss & 3) != dpl) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; |
| if (ss_dpl != dpl) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if (!(ss_e2 & DESC_S_MASK) || |
| (ss_e2 & DESC_CS_MASK) || |
| !(ss_e2 & DESC_W_MASK)) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if (!(ss_e2 & DESC_P_MASK)) { |
| raise_exception_err(env, 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 privilege */ |
| if (env->eflags & VM_MASK) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| new_stack = 0; |
| sp_mask = get_sp_mask(env->segs[R_SS].flags); |
| ssp = env->segs[R_SS].base; |
| esp = env->regs[R_ESP]; |
| dpl = cpl; |
| } else { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| new_stack = 0; /* avoid warning */ |
| sp_mask = 0; /* avoid warning */ |
| ssp = 0; /* 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, env->regs[R_ESP]); |
| } |
| PUSHL(ssp, esp, sp_mask, cpu_compute_eflags(env)); |
| 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, env->regs[R_ESP]); |
| } |
| PUSHW(ssp, esp, sp_mask, cpu_compute_eflags(env)); |
| 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, 0, 0, 0); |
| cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0, 0); |
| cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0, 0); |
| cpu_x86_load_seg_cache(env, R_GS, 0, 0, 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); |
| } |
| SET_ESP(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); |
| } |
| |
| #ifdef TARGET_X86_64 |
| |
| #define PUSHQ(sp, val)\ |
| {\ |
| sp -= 8;\ |
| cpu_stq_kernel(env, sp, (val));\ |
| } |
| |
| #define POPQ(sp, val)\ |
| {\ |
| val = cpu_ldq_kernel(env, sp);\ |
| sp += 8;\ |
| } |
| |
| static inline target_ulong get_rsp_from_tss(CPUX86State *env, int level) |
| { |
| X86CPU *cpu = x86_env_get_cpu(env); |
| int index; |
| |
| #if 0 |
| printf("TR: base=" TARGET_FMT_lx " limit=%x\n", |
| env->tr.base, env->tr.limit); |
| #endif |
| |
| if (!(env->tr.flags & DESC_P_MASK)) { |
| cpu_abort(CPU(cpu), "invalid tss"); |
| } |
| index = 8 * level + 4; |
| if ((index + 7) > env->tr.limit) { |
| raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc); |
| } |
| return cpu_ldq_kernel(env, env->tr.base + index); |
| } |
| |
| /* 64 bit interrupt */ |
| static void do_interrupt64(CPUX86State *env, int intno, int is_int, |
| int error_code, target_ulong next_eip, int is_hw) |
| { |
| SegmentCache *dt; |
| target_ulong ptr; |
| int type, dpl, selector, cpl, ist; |
| int has_error_code, new_stack; |
| uint32_t e1, e2, e3, ss; |
| target_ulong old_eip, esp, offset; |
| |
| has_error_code = 0; |
| if (!is_int && !is_hw) { |
| has_error_code = exception_has_error_code(intno); |
| } |
| if (is_int) { |
| old_eip = next_eip; |
| } else { |
| old_eip = env->eip; |
| } |
| |
| dt = &env->idt; |
| if (intno * 16 + 15 > dt->limit) { |
| raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2); |
| } |
| ptr = dt->base + intno * 16; |
| e1 = cpu_ldl_kernel(env, ptr); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| e3 = cpu_ldl_kernel(env, ptr + 8); |
| /* check gate type */ |
| type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; |
| switch(type) { |
| case 14: /* 386 interrupt gate */ |
| case 15: /* 386 trap gate */ |
| break; |
| default: |
| raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2); |
| break; |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| cpl = env->hflags & HF_CPL_MASK; |
| /* check privilege if software int */ |
| if (is_int && dpl < cpl) { |
| raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2); |
| } |
| /* check valid bit */ |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, intno * 16 + 2); |
| } |
| selector = e1 >> 16; |
| offset = ((target_ulong)e3 << 32) | (e2 & 0xffff0000) | (e1 & 0x0000ffff); |
| ist = e2 & 7; |
| if ((selector & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl > cpl) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if ((!(e2 & DESC_C_MASK) && dpl < cpl) || ist != 0) { |
| /* to inner privilege */ |
| if (ist != 0) { |
| esp = get_rsp_from_tss(env, ist + 3); |
| } else { |
| esp = get_rsp_from_tss(env, dpl); |
| } |
| esp &= ~0xfLL; /* align stack */ |
| ss = 0; |
| new_stack = 1; |
| } else if ((e2 & DESC_C_MASK) || dpl == cpl) { |
| /* to same privilege */ |
| if (env->eflags & VM_MASK) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| new_stack = 0; |
| if (ist != 0) { |
| esp = get_rsp_from_tss(env, ist + 3); |
| } else { |
| esp = env->regs[R_ESP]; |
| } |
| esp &= ~0xfLL; /* align stack */ |
| dpl = cpl; |
| } else { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| new_stack = 0; /* avoid warning */ |
| esp = 0; /* avoid warning */ |
| } |
| |
| PUSHQ(esp, env->segs[R_SS].selector); |
| PUSHQ(esp, env->regs[R_ESP]); |
| PUSHQ(esp, cpu_compute_eflags(env)); |
| PUSHQ(esp, env->segs[R_CS].selector); |
| PUSHQ(esp, old_eip); |
| if (has_error_code) { |
| PUSHQ(esp, error_code); |
| } |
| |
| if (new_stack) { |
| ss = 0 | dpl; |
| cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0); |
| } |
| env->regs[R_ESP] = esp; |
| |
| 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); |
| } |
| #endif |
| |
| #ifdef TARGET_X86_64 |
| #if defined(CONFIG_USER_ONLY) |
| void helper_syscall(CPUX86State *env, int next_eip_addend) |
| { |
| env->exception_index = EXCP_SYSCALL; |
| env->exception_next_eip = env->eip + next_eip_addend; |
| cpu_loop_exit(ENV_GET_CPU(env)); |
| } |
| #else |
| void helper_syscall(CPUX86State *env, int next_eip_addend) |
| { |
| int selector; |
| |
| if (!(env->efer & MSR_EFER_SCE)) { |
| raise_exception_err(env, EXCP06_ILLOP, 0); |
| } |
| selector = (env->star >> 32) & 0xffff; |
| if (env->hflags & HF_LMA_MASK) { |
| int code64; |
| |
| env->regs[R_ECX] = env->eip + next_eip_addend; |
| env->regs[11] = cpu_compute_eflags(env); |
| |
| code64 = env->hflags & HF_CS64_MASK; |
| |
| cpu_x86_set_cpl(env, 0); |
| cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_P_MASK | |
| DESC_S_MASK | |
| DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | |
| DESC_L_MASK); |
| cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | |
| DESC_W_MASK | DESC_A_MASK); |
| env->eflags &= ~env->fmask; |
| cpu_load_eflags(env, env->eflags, 0); |
| if (code64) { |
| env->eip = env->lstar; |
| } else { |
| env->eip = env->cstar; |
| } |
| } else { |
| env->regs[R_ECX] = (uint32_t)(env->eip + next_eip_addend); |
| |
| cpu_x86_set_cpl(env, 0); |
| cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc, |
| 0, 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, (selector + 8) & 0xfffc, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | |
| DESC_W_MASK | DESC_A_MASK); |
| env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK); |
| env->eip = (uint32_t)env->star; |
| } |
| } |
| #endif |
| #endif |
| |
| #ifdef TARGET_X86_64 |
| void helper_sysret(CPUX86State *env, int dflag) |
| { |
| int cpl, selector; |
| |
| if (!(env->efer & MSR_EFER_SCE)) { |
| raise_exception_err(env, EXCP06_ILLOP, 0); |
| } |
| cpl = env->hflags & HF_CPL_MASK; |
| if (!(env->cr[0] & CR0_PE_MASK) || cpl != 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| selector = (env->star >> 48) & 0xffff; |
| if (env->hflags & HF_LMA_MASK) { |
| if (dflag == 2) { |
| cpu_x86_load_seg_cache(env, R_CS, (selector + 16) | 3, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_P_MASK | |
| DESC_S_MASK | (3 << DESC_DPL_SHIFT) | |
| DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | |
| DESC_L_MASK); |
| env->eip = env->regs[R_ECX]; |
| } else { |
| cpu_x86_load_seg_cache(env, R_CS, selector | 3, |
| 0, 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); |
| env->eip = (uint32_t)env->regs[R_ECX]; |
| } |
| cpu_x86_load_seg_cache(env, R_SS, selector + 8, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | (3 << DESC_DPL_SHIFT) | |
| DESC_W_MASK | DESC_A_MASK); |
| cpu_load_eflags(env, (uint32_t)(env->regs[11]), TF_MASK | AC_MASK |
| | ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | |
| NT_MASK); |
| cpu_x86_set_cpl(env, 3); |
| } else { |
| cpu_x86_load_seg_cache(env, R_CS, selector | 3, |
| 0, 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); |
| env->eip = (uint32_t)env->regs[R_ECX]; |
| cpu_x86_load_seg_cache(env, R_SS, selector + 8, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | (3 << DESC_DPL_SHIFT) | |
| DESC_W_MASK | DESC_A_MASK); |
| env->eflags |= IF_MASK; |
| cpu_x86_set_cpl(env, 3); |
| } |
| } |
| #endif |
| |
| /* real mode interrupt */ |
| static void do_interrupt_real(CPUX86State *env, int intno, int is_int, |
| int error_code, unsigned int next_eip) |
| { |
| SegmentCache *dt; |
| target_ulong 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(env, EXCP0D_GPF, intno * 8 + 2); |
| } |
| ptr = dt->base + intno * 4; |
| offset = cpu_lduw_kernel(env, ptr); |
| selector = cpu_lduw_kernel(env, ptr + 2); |
| esp = env->regs[R_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, cpu_compute_eflags(env)); |
| PUSHW(ssp, esp, 0xffff, old_cs); |
| PUSHW(ssp, esp, 0xffff, old_eip); |
| |
| /* update processor state */ |
| env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | (esp & 0xffff); |
| env->eip = offset; |
| env->segs[R_CS].selector = selector; |
| env->segs[R_CS].base = (selector << 4); |
| env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK); |
| } |
| |
| #if defined(CONFIG_USER_ONLY) |
| /* fake user mode interrupt */ |
| static void do_interrupt_user(CPUX86State *env, int intno, int is_int, |
| int error_code, target_ulong next_eip) |
| { |
| SegmentCache *dt; |
| target_ulong ptr; |
| int dpl, cpl, shift; |
| uint32_t e2; |
| |
| dt = &env->idt; |
| if (env->hflags & HF_LMA_MASK) { |
| shift = 4; |
| } else { |
| shift = 3; |
| } |
| ptr = dt->base + (intno << shift); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| cpl = env->hflags & HF_CPL_MASK; |
| /* check privilege if software int */ |
| if (is_int && dpl < cpl) { |
| raise_exception_err(env, EXCP0D_GPF, (intno << shift) + 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) { |
| env->eip = next_eip; |
| } |
| } |
| |
| #else |
| |
| static void handle_even_inj(CPUX86State *env, int intno, int is_int, |
| int error_code, int is_hw, int rm) |
| { |
| uint32_t event_inj = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj)); |
| if (!(event_inj & SVM_EVTINJ_VALID)) { |
| int type; |
| if (is_int) { |
| type = SVM_EVTINJ_TYPE_SOFT; |
| } else { |
| type = SVM_EVTINJ_TYPE_EXEPT; |
| } |
| event_inj = intno | type | SVM_EVTINJ_VALID; |
| if (!rm && exception_has_error_code(intno)) { |
| event_inj |= SVM_EVTINJ_VALID_ERR; |
| stl_phys(env->vm_vmcb + offsetof(struct vmcb, |
| control.event_inj_err), |
| error_code); |
| } |
| stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj), |
| event_inj); |
| } |
| } |
| #endif |
| |
| /* |
| * Begin execution of an interruption. is_int is TRUE if coming from |
| * the int instruction. next_eip is the env->eip value AFTER the interrupt |
| * instruction. It is only relevant if is_int is TRUE. |
| */ |
| static void do_interrupt_all(CPUX86State *env, int intno, int is_int, |
| int error_code, target_ulong next_eip, int is_hw) |
| { |
| if (qemu_loglevel_mask(CPU_LOG_INT)) { |
| if ((env->cr[0] & CR0_PE_MASK)) { |
| static int count; |
| qemu_log("%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:" TARGET_FMT_lx |
| " pc=" TARGET_FMT_lx " SP=%04x:" TARGET_FMT_lx, |
| count, intno, error_code, is_int, |
| env->hflags & HF_CPL_MASK, |
| env->segs[R_CS].selector, env->eip, |
| (int)env->segs[R_CS].base + env->eip, |
| env->segs[R_SS].selector, env->regs[R_ESP]); |
| if (intno == 0x0e) { |
| qemu_log(" CR2=" TARGET_FMT_lx, env->cr[2]); |
| } else { |
| qemu_log(" EAX=" TARGET_FMT_lx, env->regs[R_EAX]); |
| } |
| qemu_log("\n"); |
| log_cpu_state(ENV_GET_CPU(env), X86_DUMP_CCOP); |
| #if 0 |
| { |
| int i; |
| target_ulong ptr; |
| qemu_log(" code="); |
| ptr = env->segs[R_CS].base + env->eip; |
| for(i = 0; i < 16; i++) { |
| qemu_log(" %02x", ldub(ptr + i)); |
| } |
| qemu_log("\n"); |
| } |
| #endif |
| count++; |
| } |
| } |
| if (env->cr[0] & CR0_PE_MASK) { |
| #if !defined(CONFIG_USER_ONLY) |
| if (env->hflags & HF_SVMI_MASK) { |
| handle_even_inj(env, intno, is_int, error_code, is_hw, 0); |
| } |
| #endif |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| do_interrupt64(env, intno, is_int, error_code, next_eip, is_hw); |
| } else |
| #endif |
| { |
| do_interrupt_protected(env, intno, is_int, error_code, next_eip, |
| is_hw); |
| } |
| } else { |
| #if !defined(CONFIG_USER_ONLY) |
| if (env->hflags & HF_SVMI_MASK) { |
| handle_even_inj(env, intno, is_int, error_code, is_hw, 1); |
| } |
| #endif |
| do_interrupt_real(env, intno, is_int, error_code, next_eip); |
| } |
| |
| #if !defined(CONFIG_USER_ONLY) |
| if (env->hflags & HF_SVMI_MASK) { |
| uint32_t event_inj = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj)); |
| stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj), event_inj & ~SVM_EVTINJ_VALID); |
| } |
| #endif |
| } |
| |
| void do_interrupt(CPUX86State *env) |
| { |
| CPUState *cs = ENV_GET_CPU(env); |
| |
| #if defined(CONFIG_USER_ONLY) |
| /* if user mode only, we simulate a fake exception |
| which will be handled outside the cpu execution |
| loop */ |
| do_interrupt_user(env, cs->exception_index, |
| env->exception_is_int, |
| env->error_code, |
| env->exception_next_eip); |
| /* successfully delivered */ |
| env->old_exception = -1; |
| #else |
| /* simulate a real cpu exception. On i386, it can |
| trigger new exceptions, but we do not handle |
| double or triple faults yet. */ |
| do_interrupt_all(env, cs->exception_index, |
| env->exception_is_int, |
| env->error_code, |
| env->exception_next_eip, 0); |
| /* successfully delivered */ |
| env->old_exception = -1; |
| #endif |
| } |
| |
| void do_interrupt_x86_hardirq(CPUX86State *env, int intno, int is_hw) |
| { |
| do_interrupt_all(env, intno, 0, 0, 0, is_hw); |
| } |
| |
| /* This should come from sysemu.h - if we could include it here... */ |
| void qemu_system_reset_request(void); |
| |
| void helper_enter_level(CPUX86State *env, int level, int data32, |
| target_ulong t1) |
| { |
| target_ulong ssp; |
| uint32_t esp_mask, esp, ebp; |
| |
| esp_mask = get_sp_mask(env->segs[R_SS].flags); |
| ssp = env->segs[R_SS].base; |
| ebp = env->regs[R_EBP]; |
| esp = env->regs[R_ESP]; |
| if (data32) { |
| /* 32 bit */ |
| esp -= 4; |
| while (--level) { |
| esp -= 4; |
| ebp -= 4; |
| cpu_stl_data(env, ssp + (esp & esp_mask), |
| cpu_ldl_data(env, ssp + (ebp & esp_mask))); |
| } |
| esp -= 4; |
| cpu_stl_data(env, ssp + (esp & esp_mask), t1); |
| } else { |
| /* 16 bit */ |
| esp -= 2; |
| while (--level) { |
| esp -= 2; |
| ebp -= 2; |
| cpu_stw_data(env, ssp + (esp & esp_mask), |
| cpu_lduw_data(env, ssp + (ebp & esp_mask))); |
| } |
| esp -= 2; |
| cpu_stw_data(env, ssp + (esp & esp_mask), t1); |
| } |
| } |
| |
| #ifdef TARGET_X86_64 |
| void helper_enter64_level(CPUX86State *env, int level, int data64, |
| target_ulong t1) |
| { |
| target_ulong esp, ebp; |
| ebp = env->regs[R_EBP]; |
| esp = env->regs[R_ESP]; |
| |
| if (data64) { |
| /* 64 bit */ |
| esp -= 8; |
| while (--level) { |
| esp -= 8; |
| ebp -= 8; |
| cpu_stq_data(env, esp, cpu_ldq_data(env, ebp)); |
| } |
| esp -= 8; |
| cpu_stq_data(env, esp, t1); |
| } else { |
| /* 16 bit */ |
| esp -= 2; |
| while (--level) { |
| esp -= 2; |
| ebp -= 2; |
| cpu_stw_data(env, esp, cpu_lduw_data(env, ebp)); |
| } |
| esp -= 2; |
| cpu_stw_data(env, esp, t1); |
| } |
| } |
| #endif |
| |
| void helper_lldt(CPUX86State *env, int selector) |
| { |
| SegmentCache *dt; |
| uint32_t e1, e2; |
| int index, entry_limit; |
| target_ulong ptr; |
| |
| selector &= 0xffff; |
| if ((selector & 0xfffc) == 0) { |
| /* XXX: NULL selector case: invalid LDT */ |
| env->ldt.base = 0; |
| env->ldt.limit = 0; |
| } else { |
| if (selector & 0x4) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| dt = &env->gdt; |
| index = selector & ~7; |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| entry_limit = 15; |
| } else |
| #endif |
| { |
| entry_limit = 7; |
| } |
| if ((index + entry_limit) > dt->limit) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| ptr = dt->base + index; |
| e1 = cpu_ldl_kernel(env, ptr); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| uint32_t e3; |
| e3 = cpu_ldl_kernel(env, ptr + 8); |
| load_seg_cache_raw_dt(&env->ldt, e1, e2); |
| env->ldt.base |= (target_ulong)e3 << 32; |
| } else |
| #endif |
| { |
| load_seg_cache_raw_dt(&env->ldt, e1, e2); |
| } |
| } |
| env->ldt.selector = selector; |
| } |
| |
| void helper_ltr(CPUX86State *env, int selector) |
| { |
| SegmentCache *dt; |
| uint32_t e1, e2; |
| int index, type, entry_limit; |
| target_ulong ptr; |
| |
| selector &= 0xffff; |
| if ((selector & 0xfffc) == 0) { |
| /* NULL selector case: invalid TR */ |
| env->tr.base = 0; |
| env->tr.limit = 0; |
| env->tr.flags = 0; |
| } else { |
| if (selector & 0x4) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| dt = &env->gdt; |
| index = selector & ~7; |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| entry_limit = 15; |
| } else |
| #endif |
| { |
| entry_limit = 7; |
| } |
| if ((index + entry_limit) > dt->limit) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| ptr = dt->base + index; |
| e1 = cpu_ldl_kernel(env, ptr); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| type = (e2 >> DESC_TYPE_SHIFT) & 0xf; |
| if ((e2 & DESC_S_MASK) || |
| (type != 1 && type != 9)) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| uint32_t e3, e4; |
| e3 = cpu_ldl_kernel(env, ptr + 8); |
| e4 = cpu_ldl_kernel(env, ptr + 12); |
| if ((e4 >> DESC_TYPE_SHIFT) & 0xf) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| load_seg_cache_raw_dt(&env->tr, e1, e2); |
| env->tr.base |= (target_ulong)e3 << 32; |
| } else |
| #endif |
| { |
| load_seg_cache_raw_dt(&env->tr, e1, e2); |
| } |
| e2 |= DESC_TSS_BUSY_MASK; |
| cpu_stl_kernel(env, ptr + 4, e2); |
| } |
| env->tr.selector = selector; |
| } |
| |
| /* only works if protected mode and not VM86. seg_reg must be != R_CS */ |
| void helper_load_seg(CPUX86State *env, int seg_reg, int selector) |
| { |
| uint32_t e1, e2; |
| int cpl, dpl, rpl; |
| SegmentCache *dt; |
| int index; |
| target_ulong ptr; |
| |
| selector &= 0xffff; |
| cpl = env->hflags & HF_CPL_MASK; |
| if ((selector & 0xfffc) == 0) { |
| /* null selector case */ |
| if (seg_reg == R_SS |
| #ifdef TARGET_X86_64 |
| && (!(env->hflags & HF_CS64_MASK) || cpl == 3) |
| #endif |
| ) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| cpu_x86_load_seg_cache(env, seg_reg, selector, 0, 0, 0); |
| } else { |
| |
| if (selector & 0x4) { |
| dt = &env->ldt; |
| } else { |
| dt = &env->gdt; |
| } |
| index = selector & ~7; |
| if ((index + 7) > dt->limit) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| ptr = dt->base + index; |
| e1 = cpu_ldl_kernel(env, ptr); |
| e2 = cpu_ldl_kernel(env, ptr + 4); |
| |
| if (!(e2 & DESC_S_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| rpl = selector & 3; |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (seg_reg == R_SS) { |
| /* must be writable segment */ |
| if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (rpl != cpl || dpl != cpl) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| } else { |
| /* must be readable segment */ |
| if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) { |
| raise_exception_err(env, 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(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| } |
| } |
| |
| if (!(e2 & DESC_P_MASK)) { |
| if (seg_reg == R_SS) { |
| raise_exception_err(env, EXCP0C_STACK, selector & 0xfffc); |
| } else { |
| raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| } |
| |
| /* set the access bit if not already set */ |
| if (!(e2 & DESC_A_MASK)) { |
| e2 |= DESC_A_MASK; |
| cpu_stl_kernel(env, 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 |
| qemu_log("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(CPUX86State *env, int new_cs, target_ulong new_eip, |
| int next_eip_addend) |
| { |
| int gate_cs, type; |
| uint32_t e1, e2, cpl, dpl, rpl, limit; |
| target_ulong next_eip; |
| |
| if ((new_cs & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| if (load_segment(env, &e1, &e2, new_cs) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| cpl = env->hflags & HF_CPL_MASK; |
| if (e2 & DESC_S_MASK) { |
| if (!(e2 & DESC_CS_MASK)) { |
| raise_exception_err(env, 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(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| } else { |
| /* non conforming code segment */ |
| rpl = new_cs & 3; |
| if (rpl > cpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (dpl != cpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc); |
| } |
| limit = get_seg_limit(e1, e2); |
| if (new_eip > limit && |
| !(env->hflags & HF_LMA_MASK) && !(e2 & DESC_L_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, |
| get_seg_base(e1, e2), limit, e2); |
| env->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(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| next_eip = env->eip + next_eip_addend; |
| switch_tss(env, new_cs, e1, e2, SWITCH_TSS_JMP, next_eip); |
| CC_OP = CC_OP_EFLAGS; |
| break; |
| case 4: /* 286 call gate */ |
| case 12: /* 386 call gate */ |
| if ((dpl < cpl) || (dpl < rpl)) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc); |
| } |
| gate_cs = e1 >> 16; |
| new_eip = (e1 & 0xffff); |
| if (type == 12) { |
| new_eip |= (e2 & 0xffff0000); |
| } |
| if (load_segment(env, &e1, &e2, gate_cs) != 0) { |
| raise_exception_err(env, 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(env, EXCP0D_GPF, gate_cs & 0xfffc); |
| } |
| if (((e2 & DESC_C_MASK) && (dpl > cpl)) || |
| (!(e2 & DESC_C_MASK) && (dpl != cpl))) { |
| raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc); |
| } |
| limit = get_seg_limit(e1, e2); |
| if (new_eip > limit) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl, |
| get_seg_base(e1, e2), limit, e2); |
| env->eip = new_eip; |
| break; |
| default: |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| break; |
| } |
| } |
| } |
| |
| /* real mode call */ |
| void helper_lcall_real(CPUX86State *env, int new_cs, target_ulong new_eip1, |
| int shift, int next_eip) |
| { |
| int new_eip; |
| uint32_t esp, esp_mask; |
| target_ulong ssp; |
| |
| new_eip = new_eip1; |
| esp = env->regs[R_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); |
| } |
| |
| SET_ESP(esp, esp_mask); |
| env->eip = new_eip; |
| env->segs[R_CS].selector = new_cs; |
| env->segs[R_CS].base = (new_cs << 4); |
| } |
| |
| /* protected mode call */ |
| void helper_lcall_protected(CPUX86State *env, int new_cs, target_ulong new_eip, |
| int shift, int next_eip_addend) |
| { |
| int new_stack, i; |
| uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count; |
| uint32_t ss = 0, ss_e1 = 0, ss_e2 = 0, sp, type, ss_dpl, sp_mask; |
| uint32_t val, limit, old_sp_mask; |
| target_ulong ssp, old_ssp, next_eip; |
| |
| next_eip = env->eip + next_eip_addend; |
| LOG_PCALL("lcall %04x:%08x s=%d\n", new_cs, (uint32_t)new_eip, shift); |
| LOG_PCALL_STATE(env); |
| if ((new_cs & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| if (load_segment(env, &e1, &e2, new_cs) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| cpl = env->hflags & HF_CPL_MASK; |
| LOG_PCALL("desc=%08x:%08x\n", e1, e2); |
| if (e2 & DESC_S_MASK) { |
| if (!(e2 & DESC_CS_MASK)) { |
| raise_exception_err(env, 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(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| } else { |
| /* non conforming code segment */ |
| rpl = new_cs & 3; |
| if (rpl > cpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (dpl != cpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc); |
| } |
| |
| #ifdef TARGET_X86_64 |
| /* XXX: check 16/32 bit cases in long mode */ |
| if (shift == 2) { |
| target_ulong rsp; |
| /* 64 bit case */ |
| rsp = env->regs[R_ESP]; |
| PUSHQ(rsp, env->segs[R_CS].selector); |
| PUSHQ(rsp, next_eip); |
| /* from this point, not restartable */ |
| env->regs[R_ESP] = rsp; |
| cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), e2); |
| env->eip = new_eip; |
| } else |
| #endif |
| { |
| sp = env->regs[R_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(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| /* from this point, not restartable */ |
| SET_ESP(sp, sp_mask); |
| cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, |
| get_seg_base(e1, e2), limit, e2); |
| env->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(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| switch_tss(env, new_cs, e1, e2, SWITCH_TSS_CALL, next_eip); |
| CC_OP = CC_OP_EFLAGS; |
| return; |
| case 4: /* 286 call gate */ |
| case 12: /* 386 call gate */ |
| break; |
| default: |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| break; |
| } |
| shift = type >> 3; |
| |
| if (dpl < cpl || dpl < rpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| /* check valid bit */ |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc); |
| } |
| selector = e1 >> 16; |
| offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff); |
| param_count = e2 & 0x1f; |
| if ((selector & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl > cpl) { |
| raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); |
| } |
| |
| if (!(e2 & DESC_C_MASK) && dpl < cpl) { |
| /* to inner privilege */ |
| get_ss_esp_from_tss(env, &ss, &sp, dpl); |
| LOG_PCALL("new ss:esp=%04x:%08x param_count=%d ESP=" |
| TARGET_FMT_lx "\n", ss, sp, param_count, |
| env->regs[R_ESP]); |
| if ((ss & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if ((ss & 3) != dpl) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; |
| if (ss_dpl != dpl) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if (!(ss_e2 & DESC_S_MASK) || |
| (ss_e2 & DESC_CS_MASK) || |
| !(ss_e2 & DESC_W_MASK)) { |
| raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); |
| } |
| if (!(ss_e2 & DESC_P_MASK)) { |
| raise_exception_err(env, 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, env->regs[R_ESP]); |
| for(i = param_count - 1; i >= 0; i--) { |
| val = cpu_ldl_kernel(env, old_ssp + |
| ((env->regs[R_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, env->regs[R_ESP]); |
| for(i = param_count - 1; i >= 0; i--) { |
| val = cpu_lduw_kernel(env, old_ssp + |
| ((env->regs[R_ESP] + i * 2) & |
| old_sp_mask)); |
| PUSHW(ssp, sp, sp_mask, val); |
| } |
| } |
| new_stack = 1; |
| } else { |
| /* to same privilege */ |
| sp = env->regs[R_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); |
| SET_ESP(sp, sp_mask); |
| env->eip = offset; |
| } |
| } |
| |
| /* real and vm86 mode iret */ |
| void helper_iret_real(CPUX86State *env, int shift) |
| { |
| uint32_t sp, new_cs, new_eip, new_eflags, sp_mask; |
| target_ulong ssp; |
| int eflags_mask; |
| |
| sp_mask = 0xffff; /* XXXX: use SS segment size ? */ |
| sp = env->regs[R_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); |
| } |
| env->regs[R_ESP] = (env->regs[R_ESP] & ~sp_mask) | (sp & sp_mask); |
| env->segs[R_CS].selector = new_cs; |
| env->segs[R_CS].base = (new_cs << 4); |
| 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; |
| } |
| cpu_load_eflags(env, new_eflags, eflags_mask); |
| env->hflags2 &= ~HF2_NMI_MASK; |
| } |
| |
| static inline void validate_seg(CPUX86State *env, int seg_reg, int cpl) |
| { |
| int dpl; |
| uint32_t e2; |
| |
| /* XXX: on x86_64, we do not want to nullify FS and GS because |
| they may still contain a valid base. I would be interested to |
| know how a real x86_64 CPU behaves */ |
| if ((seg_reg == R_FS || seg_reg == R_GS) && |
| (env->segs[seg_reg].selector & 0xfffc) == 0) { |
| return; |
| } |
| |
| 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, 0, 0, 0); |
| } |
| } |
| } |
| |
| /* protected mode iret */ |
| static inline void helper_ret_protected(CPUX86State *env, int shift, |
| int is_iret, int addend) |
| { |
| uint32_t new_cs, new_eflags, 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, iopl; |
| target_ulong ssp, sp, new_eip, new_esp, sp_mask; |
| |
| #ifdef TARGET_X86_64 |
| if (shift == 2) { |
| sp_mask = -1; |
| } else |
| #endif |
| { |
| sp_mask = get_sp_mask(env->segs[R_SS].flags); |
| } |
| sp = env->regs[R_ESP]; |
| ssp = env->segs[R_SS].base; |
| new_eflags = 0; /* avoid warning */ |
| #ifdef TARGET_X86_64 |
| if (shift == 2) { |
| POPQ(sp, new_eip); |
| POPQ(sp, new_cs); |
| new_cs &= 0xffff; |
| if (is_iret) { |
| POPQ(sp, new_eflags); |
| } |
| } else |
| #endif |
| { |
| 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); |
| } |
| } |
| } |
| LOG_PCALL("lret new %04x:" TARGET_FMT_lx " s=%d addend=0x%x\n", |
| new_cs, new_eip, shift, addend); |
| LOG_PCALL_STATE(env); |
| if ((new_cs & 0xfffc) == 0) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (load_segment(env, &e1, &e2, new_cs) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| if (!(e2 & DESC_S_MASK) || |
| !(e2 & DESC_CS_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| cpl = env->hflags & HF_CPL_MASK; |
| rpl = new_cs & 3; |
| if (rpl < cpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| if (e2 & DESC_C_MASK) { |
| if (dpl > rpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| } else { |
| if (dpl != rpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc); |
| } |
| } |
| if (!(e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc); |
| } |
| |
| sp += addend; |
| if (rpl == cpl && (!(env->hflags & HF_CS64_MASK) || |
| ((env->hflags & HF_CS64_MASK) && !is_iret))) { |
| /* return to same privilege 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 privilege level */ |
| #ifdef TARGET_X86_64 |
| if (shift == 2) { |
| POPQ(sp, new_esp); |
| POPQ(sp, new_ss); |
| new_ss &= 0xffff; |
| } else |
| #endif |
| { |
| 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); |
| } |
| } |
| LOG_PCALL("new ss:esp=%04x:" TARGET_FMT_lx "\n", |
| new_ss, new_esp); |
| if ((new_ss & 0xfffc) == 0) { |
| #ifdef TARGET_X86_64 |
| /* NULL ss is allowed in long mode if cpl != 3*/ |
| /* XXX: test CS64 ? */ |
| if ((env->hflags & HF_LMA_MASK) && rpl != 3) { |
| cpu_x86_load_seg_cache(env, R_SS, new_ss, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | (rpl << DESC_DPL_SHIFT) | |
| DESC_W_MASK | DESC_A_MASK); |
| ss_e2 = DESC_B_MASK; /* XXX: should not be needed ? */ |
| } else |
| #endif |
| { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| } else { |
| if ((new_ss & 3) != rpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc); |
| } |
| if (load_segment(env, &ss_e1, &ss_e2, new_ss) != 0) { |
| raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc); |
| } |
| if (!(ss_e2 & DESC_S_MASK) || |
| (ss_e2 & DESC_CS_MASK) || |
| !(ss_e2 & DESC_W_MASK)) { |
| raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc); |
| } |
| dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; |
| if (dpl != rpl) { |
| raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc); |
| } |
| if (!(ss_e2 & DESC_P_MASK)) { |
| raise_exception_err(env, EXCP0B_NOSEG, new_ss & 0xfffc); |
| } |
| 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_load_seg_cache(env, R_CS, new_cs, |
| get_seg_base(e1, e2), |
| get_seg_limit(e1, e2), |
| e2); |
| cpu_x86_set_cpl(env, rpl); |
| sp = new_esp; |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_CS64_MASK) { |
| sp_mask = -1; |
| } else |
| #endif |
| { |
| sp_mask = get_sp_mask(ss_e2); |
| } |
| |
| /* validate data segments */ |
| validate_seg(env, R_ES, rpl); |
| validate_seg(env, R_DS, rpl); |
| validate_seg(env, R_FS, rpl); |
| validate_seg(env, R_GS, rpl); |
| |
| sp += addend; |
| } |
| SET_ESP(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; |
| } |
| cpu_load_eflags(env, 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 */ |
| cpu_load_eflags(env, new_eflags, TF_MASK | AC_MASK | ID_MASK | |
| IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK | |
| VIP_MASK); |
| load_seg_vm(env, R_CS, new_cs & 0xffff); |
| cpu_x86_set_cpl(env, 3); |
| load_seg_vm(env, R_SS, new_ss & 0xffff); |
| load_seg_vm(env, R_ES, new_es & 0xffff); |
| load_seg_vm(env, R_DS, new_ds & 0xffff); |
| load_seg_vm(env, R_FS, new_fs & 0xffff); |
| load_seg_vm(env, R_GS, new_gs & 0xffff); |
| |
| env->eip = new_eip & 0xffff; |
| env->regs[R_ESP] = new_esp; |
| } |
| |
| void helper_iret_protected(CPUX86State *env, int shift, int next_eip) |
| { |
| int tss_selector, type; |
| uint32_t e1, e2; |
| |
| /* specific case for TSS */ |
| if (env->eflags & NT_MASK) { |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| #endif |
| tss_selector = cpu_lduw_kernel(env, env->tr.base + 0); |
| if (tss_selector & 4) { |
| raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc); |
| } |
| if (load_segment(env, &e1, &e2, tss_selector) != 0) { |
| raise_exception_err(env, 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(env, EXCP0A_TSS, tss_selector & 0xfffc); |
| } |
| switch_tss(env, tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip); |
| } else { |
| helper_ret_protected(env, shift, 1, 0); |
| } |
| env->hflags2 &= ~HF2_NMI_MASK; |
| } |
| |
| void helper_lret_protected(CPUX86State *env, int shift, int addend) |
| { |
| helper_ret_protected(env, shift, 0, addend); |
| } |
| |
| void helper_sysenter(CPUX86State *env) |
| { |
| if (env->sysenter_cs == 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK); |
| cpu_x86_set_cpl(env, 0); |
| |
| #ifdef TARGET_X86_64 |
| if (env->hflags & HF_LMA_MASK) { |
| cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | |
| DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | |
| DESC_L_MASK); |
| } else |
| #endif |
| { |
| cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc, |
| 0, 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, |
| 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | |
| DESC_W_MASK | DESC_A_MASK); |
| env->regs[R_ESP] = env->sysenter_esp; |
| env->eip = env->sysenter_eip; |
| } |
| |
| void helper_sysexit(CPUX86State *env, int dflag) |
| { |
| int cpl; |
| |
| cpl = env->hflags & HF_CPL_MASK; |
| if (env->sysenter_cs == 0 || cpl != 0) { |
| raise_exception_err(env, EXCP0D_GPF, 0); |
| } |
| cpu_x86_set_cpl(env, 3); |
| #ifdef TARGET_X86_64 |
| if (dflag == 2) { |
| cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 32) & 0xfffc) | |
| 3, 0, 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 | |
| DESC_L_MASK); |
| cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 40) & 0xfffc) | |
| 3, 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | (3 << DESC_DPL_SHIFT) | |
| DESC_W_MASK | DESC_A_MASK); |
| } else |
| #endif |
| { |
| cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) | |
| 3, 0, 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, 0, 0xffffffff, |
| DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | |
| DESC_S_MASK | (3 << DESC_DPL_SHIFT) | |
| DESC_W_MASK | DESC_A_MASK); |
| } |
| env->regs[R_ESP] = env->regs[R_ECX]; |
| env->eip = env->regs[R_EDX]; |
| } |
| |
| target_ulong helper_lsl(CPUX86State *env, target_ulong selector1) |
| { |
| unsigned int limit; |
| uint32_t e1, e2, eflags, selector; |
| int rpl, dpl, cpl, type; |
| |
| selector = selector1 & 0xffff; |
| eflags = helper_cc_compute_all(env, CC_OP); |
| if ((selector & 0xfffc) == 0) { |
| goto fail; |
| } |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| goto fail; |
| } |
| 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) { |
| goto fail; |
| } |
| } |
| } else { |
| type = (e2 >> DESC_TYPE_SHIFT) & 0xf; |
| switch(type) { |
| case 1: |
| case 2: |
| case 3: |
| case 9: |
| case 11: |
| break; |
| default: |
| goto fail; |
| } |
| if (dpl < cpl || dpl < rpl) { |
| fail: |
| CC_SRC = eflags & ~CC_Z; |
| return 0; |
| } |
| } |
| limit = get_seg_limit(e1, e2); |
| CC_SRC = eflags | CC_Z; |
| return limit; |
| } |
| |
| target_ulong helper_lar(CPUX86State *env, target_ulong selector1) |
| { |
| uint32_t e1, e2, eflags, selector; |
| int rpl, dpl, cpl, type; |
| |
| selector = selector1 & 0xffff; |
| eflags = helper_cc_compute_all(env, CC_OP); |
| if ((selector & 0xfffc) == 0) { |
| goto fail; |
| } |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| goto fail; |
| } |
| 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) { |
| goto fail; |
| } |
| } |
| } 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: |
| goto fail; |
| } |
| if (dpl < cpl || dpl < rpl) { |
| fail: |
| CC_SRC = eflags & ~CC_Z; |
| return 0; |
| } |
| } |
| CC_SRC = eflags | CC_Z; |
| return e2 & 0x00f0ff00; |
| } |
| |
| void helper_verr(CPUX86State *env, target_ulong selector1) |
| { |
| uint32_t e1, e2, eflags, selector; |
| int rpl, dpl, cpl; |
| |
| selector = selector1 & 0xffff; |
| eflags = helper_cc_compute_all(env, CC_OP); |
| if ((selector & 0xfffc) == 0) { |
| goto fail; |
| } |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| goto fail; |
| } |
| if (!(e2 & DESC_S_MASK)) { |
| goto fail; |
| } |
| 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)) { |
| goto fail; |
| } |
| if (!(e2 & DESC_C_MASK)) { |
| if (dpl < cpl || dpl < rpl) { |
| goto fail; |
| } |
| } |
| } else { |
| if (dpl < cpl || dpl < rpl) { |
| fail: |
| CC_SRC = eflags & ~CC_Z; |
| return; |
| } |
| } |
| CC_SRC = eflags | CC_Z; |
| } |
| |
| void helper_verw(CPUX86State *env, target_ulong selector1) |
| { |
| uint32_t e1, e2, eflags, selector; |
| int rpl, dpl, cpl; |
| |
| selector = selector1 & 0xffff; |
| eflags = helper_cc_compute_all(env, CC_OP); |
| if ((selector & 0xfffc) == 0) { |
| goto fail; |
| } |
| if (load_segment(env, &e1, &e2, selector) != 0) { |
| goto fail; |
| } |
| if (!(e2 & DESC_S_MASK)) { |
| goto fail; |
| } |
| rpl = selector & 3; |
| dpl = (e2 >> DESC_DPL_SHIFT) & 3; |
| cpl = env->hflags & HF_CPL_MASK; |
| if (e2 & DESC_CS_MASK) { |
| goto fail; |
| } else { |
| if (dpl < cpl || dpl < rpl) { |
| goto fail; |
| } |
| if (!(e2 & DESC_W_MASK)) { |
| fail: |
| CC_SRC = eflags & ~CC_Z; |
| return; |
| } |
| } |
| CC_SRC = eflags | CC_Z; |
| } |
