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-rw-r--r--linux-user/vm86.c482
1 files changed, 0 insertions, 482 deletions
diff --git a/linux-user/vm86.c b/linux-user/vm86.c
deleted file mode 100644
index b28eea6..0000000
--- a/linux-user/vm86.c
+++ /dev/null
@@ -1,482 +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, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-
-#include "qemu.h"
-
-//#define DEBUG_VM86
-
-#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(uint8_t *segptr, unsigned int reg16, unsigned int val)
-{
- stw(segptr + (reg16 & 0xffff), val);
-}
-
-static inline void vm_putl(uint8_t *segptr, unsigned int reg16, unsigned int val)
-{
- stl(segptr + (reg16 & 0xffff), val);
-}
-
-static inline unsigned int vm_getw(uint8_t *segptr, unsigned int reg16)
-{
- return lduw(segptr + (reg16 & 0xffff));
-}
-
-static inline unsigned int vm_getl(uint8_t *segptr, unsigned int reg16)
-{
- return ldl(segptr + (reg16 & 0xffff));
-}
-
-void save_v86_state(CPUX86State *env)
-{
- TaskState *ts = env->opaque;
- struct target_vm86plus_struct * target_v86;
-
- lock_user_struct(target_v86, ts->target_v86, 0);
- /* 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);
-#ifdef DEBUG_VM86
- fprintf(logfile, "save_v86_state: eflags=%08x cs:ip=%04x:%04x\n",
- env->eflags, env->segs[R_CS].selector, env->eip);
-#endif
-
- /* 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)
-{
-#ifdef DEBUG_VM86
- fprintf(logfile, "return_to_32bit: ret=0x%x\n", retval);
-#endif
- save_v86_state(env);
- env->regs[R_EAX] = retval;
-}
-
-static inline int set_IF(CPUX86State *env)
-{
- TaskState *ts = env->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)
-{
- TaskState *ts = env->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)
-{
- TaskState *ts = env->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)
-{
- TaskState *ts = env->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)
-{
- TaskState *ts = env->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)
-{
- TaskState *ts = env->opaque;
- uint32_t *int_ptr, segoffs;
- uint8_t *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_ptr = (uint32_t *)(intno << 2);
- segoffs = tswap32(*int_ptr);
- if ((segoffs >> 16) == TARGET_BIOSSEG)
- goto cannot_handle;
-#if defined(DEBUG_VM86)
- fprintf(logfile, "VM86: emulating int 0x%x. CS:IP=%04x:%04x\n",
- intno, segoffs >> 16, segoffs & 0xffff);
-#endif
- /* save old state */
- ssp = (uint8_t *)(env->segs[R_SS].selector << 4);
- sp = env->regs[R_ESP] & 0xffff;
- vm_putw(ssp, sp - 2, get_vflags(env));
- vm_putw(ssp, sp - 4, env->segs[R_CS].selector);
- vm_putw(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:
-#if defined(DEBUG_VM86)
- fprintf(logfile, "VM86: return to 32 bits int 0x%x\n", intno);
-#endif
- 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)
-{
- TaskState *ts = env->opaque;
- uint8_t *csp, *pc, *ssp;
- unsigned int ip, sp, newflags, newip, newcs, opcode, intno;
- int data32, pref_done;
-
- csp = (uint8_t *)(env->segs[R_CS].selector << 4);
- ip = env->eip & 0xffff;
- pc = csp + ip;
-
- ssp = (uint8_t *)(env->segs[R_SS].selector << 4);
- sp = env->regs[R_ESP] & 0xffff;
-
-#if defined(DEBUG_VM86)
- fprintf(logfile, "VM86 exception %04x:%08x %02x %02x\n",
- env->segs[R_CS].selector, env->eip, pc[0], pc[1]);
-#endif
-
- data32 = 0;
- pref_done = 0;
- do {
- opcode = 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(ssp, sp - 4, get_vflags(env));
- ADD16(env->regs[R_ESP], -4);
- } else {
- vm_putw(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(ssp, sp);
- ADD16(env->regs[R_ESP], 4);
- } else {
- newflags = vm_getw(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 = 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(ssp, sp) & 0xffff;
- newcs = vm_getl(ssp, sp + 4) & 0xffff;
- newflags = vm_getl(ssp, sp + 8);
- ADD16(env->regs[R_ESP], 12);
- } else {
- newip = vm_getw(ssp, sp);
- newcs = vm_getw(ssp, sp + 2);
- newflags = vm_getw(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, target_ulong vm86_addr)
-{
- TaskState *ts = env->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 = -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;
- lock_user_struct(target_v86, vm86_addr, 1);
- /* 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 = tswapl(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 = tswapl(target_v86->vm86plus.flags);
- memcpy(&ts->vm86plus.vm86plus.vm86dbg_intxxtab,
- target_v86->vm86plus.vm86dbg_intxxtab, 32);
- unlock_user_struct(target_v86, vm86_addr, 0);
-
-#ifdef DEBUG_VM86
- fprintf(logfile, "do_vm86: cs:ip=%04x:%04x\n",
- env->segs[R_CS].selector, env->eip);
-#endif
- /* now the virtual CPU is ready for vm86 execution ! */
- out:
- return ret;
-}
-
generated by cgit v1.1 at 2024-05-20 21:04:34 +0000