diff options
Diffstat (limited to 'qemu/linux-user/vm86.c')
| -rw-r--r-- | qemu/linux-user/vm86.c | 490 |
1 files changed, 0 insertions, 490 deletions
diff --git a/qemu/linux-user/vm86.c b/qemu/linux-user/vm86.c deleted file mode 100644 index 3829b9a67..000000000 --- a/qemu/linux-user/vm86.c +++ /dev/null @@ -1,490 +0,0 @@ -/* - * vm86 linux syscall support - * - * Copyright (c) 2003 Fabrice Bellard - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see <http://www.gnu.org/licenses/>. - */ -#include "qemu/osdep.h" - -#include "qemu.h" - -//#define DEBUG_VM86 - -#ifdef DEBUG_VM86 -# define LOG_VM86(...) qemu_log(__VA_ARGS__); -#else -# define LOG_VM86(...) do { } while (0) -#endif - - -#define set_flags(X,new,mask) \ -((X) = ((X) & ~(mask)) | ((new) & (mask))) - -#define SAFE_MASK (0xDD5) -#define RETURN_MASK (0xDFF) - -static inline int is_revectored(int nr, struct target_revectored_struct *bitmap) -{ - return (((uint8_t *)bitmap)[nr >> 3] >> (nr & 7)) & 1; -} - -static inline void vm_putw(CPUX86State *env, uint32_t segptr, - unsigned int reg16, unsigned int val) -{ - cpu_stw_data(env, segptr + (reg16 & 0xffff), val); -} - -static inline void vm_putl(CPUX86State *env, uint32_t segptr, - unsigned int reg16, unsigned int val) -{ - cpu_stl_data(env, segptr + (reg16 & 0xffff), val); -} - -static inline unsigned int vm_getb(CPUX86State *env, - uint32_t segptr, unsigned int reg16) -{ - return cpu_ldub_data(env, segptr + (reg16 & 0xffff)); -} - -static inline unsigned int vm_getw(CPUX86State *env, - uint32_t segptr, unsigned int reg16) -{ - return cpu_lduw_data(env, segptr + (reg16 & 0xffff)); -} - -static inline unsigned int vm_getl(CPUX86State *env, - uint32_t segptr, unsigned int reg16) -{ - return cpu_ldl_data(env, segptr + (reg16 & 0xffff)); -} - -void save_v86_state(CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - struct target_vm86plus_struct * target_v86; - - if (!lock_user_struct(VERIFY_WRITE, target_v86, ts->target_v86, 0)) - /* FIXME - should return an error */ - return; - /* put the VM86 registers in the userspace register structure */ - target_v86->regs.eax = tswap32(env->regs[R_EAX]); - target_v86->regs.ebx = tswap32(env->regs[R_EBX]); - target_v86->regs.ecx = tswap32(env->regs[R_ECX]); - target_v86->regs.edx = tswap32(env->regs[R_EDX]); - target_v86->regs.esi = tswap32(env->regs[R_ESI]); - target_v86->regs.edi = tswap32(env->regs[R_EDI]); - target_v86->regs.ebp = tswap32(env->regs[R_EBP]); - target_v86->regs.esp = tswap32(env->regs[R_ESP]); - target_v86->regs.eip = tswap32(env->eip); - target_v86->regs.cs = tswap16(env->segs[R_CS].selector); - target_v86->regs.ss = tswap16(env->segs[R_SS].selector); - target_v86->regs.ds = tswap16(env->segs[R_DS].selector); - target_v86->regs.es = tswap16(env->segs[R_ES].selector); - target_v86->regs.fs = tswap16(env->segs[R_FS].selector); - target_v86->regs.gs = tswap16(env->segs[R_GS].selector); - set_flags(env->eflags, ts->v86flags, VIF_MASK | ts->v86mask); - target_v86->regs.eflags = tswap32(env->eflags); - unlock_user_struct(target_v86, ts->target_v86, 1); - LOG_VM86("save_v86_state: eflags=%08x cs:ip=%04x:%04x\n", - env->eflags, env->segs[R_CS].selector, env->eip); - - /* restore 32 bit registers */ - env->regs[R_EAX] = ts->vm86_saved_regs.eax; - env->regs[R_EBX] = ts->vm86_saved_regs.ebx; - env->regs[R_ECX] = ts->vm86_saved_regs.ecx; - env->regs[R_EDX] = ts->vm86_saved_regs.edx; - env->regs[R_ESI] = ts->vm86_saved_regs.esi; - env->regs[R_EDI] = ts->vm86_saved_regs.edi; - env->regs[R_EBP] = ts->vm86_saved_regs.ebp; - env->regs[R_ESP] = ts->vm86_saved_regs.esp; - env->eflags = ts->vm86_saved_regs.eflags; - env->eip = ts->vm86_saved_regs.eip; - - cpu_x86_load_seg(env, R_CS, ts->vm86_saved_regs.cs); - cpu_x86_load_seg(env, R_SS, ts->vm86_saved_regs.ss); - cpu_x86_load_seg(env, R_DS, ts->vm86_saved_regs.ds); - cpu_x86_load_seg(env, R_ES, ts->vm86_saved_regs.es); - cpu_x86_load_seg(env, R_FS, ts->vm86_saved_regs.fs); - cpu_x86_load_seg(env, R_GS, ts->vm86_saved_regs.gs); -} - -/* return from vm86 mode to 32 bit. The vm86() syscall will return - 'retval' */ -static inline void return_to_32bit(CPUX86State *env, int retval) -{ - LOG_VM86("return_to_32bit: ret=0x%x\n", retval); - save_v86_state(env); - env->regs[R_EAX] = retval; -} - -static inline int set_IF(CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - - ts->v86flags |= VIF_MASK; - if (ts->v86flags & VIP_MASK) { - return_to_32bit(env, TARGET_VM86_STI); - return 1; - } - return 0; -} - -static inline void clear_IF(CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - - ts->v86flags &= ~VIF_MASK; -} - -static inline void clear_TF(CPUX86State *env) -{ - env->eflags &= ~TF_MASK; -} - -static inline void clear_AC(CPUX86State *env) -{ - env->eflags &= ~AC_MASK; -} - -static inline int set_vflags_long(unsigned long eflags, CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - - set_flags(ts->v86flags, eflags, ts->v86mask); - set_flags(env->eflags, eflags, SAFE_MASK); - if (eflags & IF_MASK) - return set_IF(env); - else - clear_IF(env); - return 0; -} - -static inline int set_vflags_short(unsigned short flags, CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - - set_flags(ts->v86flags, flags, ts->v86mask & 0xffff); - set_flags(env->eflags, flags, SAFE_MASK); - if (flags & IF_MASK) - return set_IF(env); - else - clear_IF(env); - return 0; -} - -static inline unsigned int get_vflags(CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - unsigned int flags; - - flags = env->eflags & RETURN_MASK; - if (ts->v86flags & VIF_MASK) - flags |= IF_MASK; - flags |= IOPL_MASK; - return flags | (ts->v86flags & ts->v86mask); -} - -#define ADD16(reg, val) reg = (reg & ~0xffff) | ((reg + (val)) & 0xffff) - -/* handle VM86 interrupt (NOTE: the CPU core currently does not - support TSS interrupt revectoring, so this code is always executed) */ -static void do_int(CPUX86State *env, int intno) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - uint32_t int_addr, segoffs, ssp; - unsigned int sp; - - if (env->segs[R_CS].selector == TARGET_BIOSSEG) - goto cannot_handle; - if (is_revectored(intno, &ts->vm86plus.int_revectored)) - goto cannot_handle; - if (intno == 0x21 && is_revectored((env->regs[R_EAX] >> 8) & 0xff, - &ts->vm86plus.int21_revectored)) - goto cannot_handle; - int_addr = (intno << 2); - segoffs = cpu_ldl_data(env, int_addr); - if ((segoffs >> 16) == TARGET_BIOSSEG) - goto cannot_handle; - LOG_VM86("VM86: emulating int 0x%x. CS:IP=%04x:%04x\n", - intno, segoffs >> 16, segoffs & 0xffff); - /* save old state */ - ssp = env->segs[R_SS].selector << 4; - sp = env->regs[R_ESP] & 0xffff; - vm_putw(env, ssp, sp - 2, get_vflags(env)); - vm_putw(env, ssp, sp - 4, env->segs[R_CS].selector); - vm_putw(env, ssp, sp - 6, env->eip); - ADD16(env->regs[R_ESP], -6); - /* goto interrupt handler */ - env->eip = segoffs & 0xffff; - cpu_x86_load_seg(env, R_CS, segoffs >> 16); - clear_TF(env); - clear_IF(env); - clear_AC(env); - return; - cannot_handle: - LOG_VM86("VM86: return to 32 bits int 0x%x\n", intno); - return_to_32bit(env, TARGET_VM86_INTx | (intno << 8)); -} - -void handle_vm86_trap(CPUX86State *env, int trapno) -{ - if (trapno == 1 || trapno == 3) { - return_to_32bit(env, TARGET_VM86_TRAP + (trapno << 8)); - } else { - do_int(env, trapno); - } -} - -#define CHECK_IF_IN_TRAP() \ - if ((ts->vm86plus.vm86plus.flags & TARGET_vm86dbg_active) && \ - (ts->vm86plus.vm86plus.flags & TARGET_vm86dbg_TFpendig)) \ - newflags |= TF_MASK - -#define VM86_FAULT_RETURN \ - if ((ts->vm86plus.vm86plus.flags & TARGET_force_return_for_pic) && \ - (ts->v86flags & (IF_MASK | VIF_MASK))) \ - return_to_32bit(env, TARGET_VM86_PICRETURN); \ - return - -void handle_vm86_fault(CPUX86State *env) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - uint32_t csp, ssp; - unsigned int ip, sp, newflags, newip, newcs, opcode, intno; - int data32, pref_done; - - csp = env->segs[R_CS].selector << 4; - ip = env->eip & 0xffff; - - ssp = env->segs[R_SS].selector << 4; - sp = env->regs[R_ESP] & 0xffff; - - LOG_VM86("VM86 exception %04x:%08x\n", - env->segs[R_CS].selector, env->eip); - - data32 = 0; - pref_done = 0; - do { - opcode = vm_getb(env, csp, ip); - ADD16(ip, 1); - switch (opcode) { - case 0x66: /* 32-bit data */ data32=1; break; - case 0x67: /* 32-bit address */ break; - case 0x2e: /* CS */ break; - case 0x3e: /* DS */ break; - case 0x26: /* ES */ break; - case 0x36: /* SS */ break; - case 0x65: /* GS */ break; - case 0x64: /* FS */ break; - case 0xf2: /* repnz */ break; - case 0xf3: /* rep */ break; - default: pref_done = 1; - } - } while (!pref_done); - - /* VM86 mode */ - switch(opcode) { - case 0x9c: /* pushf */ - if (data32) { - vm_putl(env, ssp, sp - 4, get_vflags(env)); - ADD16(env->regs[R_ESP], -4); - } else { - vm_putw(env, ssp, sp - 2, get_vflags(env)); - ADD16(env->regs[R_ESP], -2); - } - env->eip = ip; - VM86_FAULT_RETURN; - - case 0x9d: /* popf */ - if (data32) { - newflags = vm_getl(env, ssp, sp); - ADD16(env->regs[R_ESP], 4); - } else { - newflags = vm_getw(env, ssp, sp); - ADD16(env->regs[R_ESP], 2); - } - env->eip = ip; - CHECK_IF_IN_TRAP(); - if (data32) { - if (set_vflags_long(newflags, env)) - return; - } else { - if (set_vflags_short(newflags, env)) - return; - } - VM86_FAULT_RETURN; - - case 0xcd: /* int */ - intno = vm_getb(env, csp, ip); - ADD16(ip, 1); - env->eip = ip; - if (ts->vm86plus.vm86plus.flags & TARGET_vm86dbg_active) { - if ( (ts->vm86plus.vm86plus.vm86dbg_intxxtab[intno >> 3] >> - (intno &7)) & 1) { - return_to_32bit(env, TARGET_VM86_INTx + (intno << 8)); - return; - } - } - do_int(env, intno); - break; - - case 0xcf: /* iret */ - if (data32) { - newip = vm_getl(env, ssp, sp) & 0xffff; - newcs = vm_getl(env, ssp, sp + 4) & 0xffff; - newflags = vm_getl(env, ssp, sp + 8); - ADD16(env->regs[R_ESP], 12); - } else { - newip = vm_getw(env, ssp, sp); - newcs = vm_getw(env, ssp, sp + 2); - newflags = vm_getw(env, ssp, sp + 4); - ADD16(env->regs[R_ESP], 6); - } - env->eip = newip; - cpu_x86_load_seg(env, R_CS, newcs); - CHECK_IF_IN_TRAP(); - if (data32) { - if (set_vflags_long(newflags, env)) - return; - } else { - if (set_vflags_short(newflags, env)) - return; - } - VM86_FAULT_RETURN; - - case 0xfa: /* cli */ - env->eip = ip; - clear_IF(env); - VM86_FAULT_RETURN; - - case 0xfb: /* sti */ - env->eip = ip; - if (set_IF(env)) - return; - VM86_FAULT_RETURN; - - default: - /* real VM86 GPF exception */ - return_to_32bit(env, TARGET_VM86_UNKNOWN); - break; - } -} - -int do_vm86(CPUX86State *env, long subfunction, abi_ulong vm86_addr) -{ - CPUState *cs = CPU(x86_env_get_cpu(env)); - TaskState *ts = cs->opaque; - struct target_vm86plus_struct * target_v86; - int ret; - - switch (subfunction) { - case TARGET_VM86_REQUEST_IRQ: - case TARGET_VM86_FREE_IRQ: - case TARGET_VM86_GET_IRQ_BITS: - case TARGET_VM86_GET_AND_RESET_IRQ: - gemu_log("qemu: unsupported vm86 subfunction (%ld)\n", subfunction); - ret = -TARGET_EINVAL; - goto out; - case TARGET_VM86_PLUS_INSTALL_CHECK: - /* NOTE: on old vm86 stuff this will return the error - from verify_area(), because the subfunction is - interpreted as (invalid) address to vm86_struct. - So the installation check works. - */ - ret = 0; - goto out; - } - - /* save current CPU regs */ - ts->vm86_saved_regs.eax = 0; /* default vm86 syscall return code */ - ts->vm86_saved_regs.ebx = env->regs[R_EBX]; - ts->vm86_saved_regs.ecx = env->regs[R_ECX]; - ts->vm86_saved_regs.edx = env->regs[R_EDX]; - ts->vm86_saved_regs.esi = env->regs[R_ESI]; - ts->vm86_saved_regs.edi = env->regs[R_EDI]; - ts->vm86_saved_regs.ebp = env->regs[R_EBP]; - ts->vm86_saved_regs.esp = env->regs[R_ESP]; - ts->vm86_saved_regs.eflags = env->eflags; - ts->vm86_saved_regs.eip = env->eip; - ts->vm86_saved_regs.cs = env->segs[R_CS].selector; - ts->vm86_saved_regs.ss = env->segs[R_SS].selector; - ts->vm86_saved_regs.ds = env->segs[R_DS].selector; - ts->vm86_saved_regs.es = env->segs[R_ES].selector; - ts->vm86_saved_regs.fs = env->segs[R_FS].selector; - ts->vm86_saved_regs.gs = env->segs[R_GS].selector; - - ts->target_v86 = vm86_addr; - if (!lock_user_struct(VERIFY_READ, target_v86, vm86_addr, 1)) - return -TARGET_EFAULT; - /* build vm86 CPU state */ - ts->v86flags = tswap32(target_v86->regs.eflags); - env->eflags = (env->eflags & ~SAFE_MASK) | - (tswap32(target_v86->regs.eflags) & SAFE_MASK) | VM_MASK; - - ts->vm86plus.cpu_type = tswapal(target_v86->cpu_type); - switch (ts->vm86plus.cpu_type) { - case TARGET_CPU_286: - ts->v86mask = 0; - break; - case TARGET_CPU_386: - ts->v86mask = NT_MASK | IOPL_MASK; - break; - case TARGET_CPU_486: - ts->v86mask = AC_MASK | NT_MASK | IOPL_MASK; - break; - default: - ts->v86mask = ID_MASK | AC_MASK | NT_MASK | IOPL_MASK; - break; - } - - env->regs[R_EBX] = tswap32(target_v86->regs.ebx); - env->regs[R_ECX] = tswap32(target_v86->regs.ecx); - env->regs[R_EDX] = tswap32(target_v86->regs.edx); - env->regs[R_ESI] = tswap32(target_v86->regs.esi); - env->regs[R_EDI] = tswap32(target_v86->regs.edi); - env->regs[R_EBP] = tswap32(target_v86->regs.ebp); - env->regs[R_ESP] = tswap32(target_v86->regs.esp); - env->eip = tswap32(target_v86->regs.eip); - cpu_x86_load_seg(env, R_CS, tswap16(target_v86->regs.cs)); - cpu_x86_load_seg(env, R_SS, tswap16(target_v86->regs.ss)); - cpu_x86_load_seg(env, R_DS, tswap16(target_v86->regs.ds)); - cpu_x86_load_seg(env, R_ES, tswap16(target_v86->regs.es)); - cpu_x86_load_seg(env, R_FS, tswap16(target_v86->regs.fs)); - cpu_x86_load_seg(env, R_GS, tswap16(target_v86->regs.gs)); - ret = tswap32(target_v86->regs.eax); /* eax will be restored at - the end of the syscall */ - memcpy(&ts->vm86plus.int_revectored, - &target_v86->int_revectored, 32); - memcpy(&ts->vm86plus.int21_revectored, - &target_v86->int21_revectored, 32); - ts->vm86plus.vm86plus.flags = tswapal(target_v86->vm86plus.flags); - memcpy(&ts->vm86plus.vm86plus.vm86dbg_intxxtab, - target_v86->vm86plus.vm86dbg_intxxtab, 32); - unlock_user_struct(target_v86, vm86_addr, 0); - - LOG_VM86("do_vm86: cs:ip=%04x:%04x\n", - env->segs[R_CS].selector, env->eip); - /* now the virtual CPU is ready for vm86 execution ! */ - out: - return ret; -} |