| 1 | #ifdef HAVE_XORG_CONFIG_H |
| 2 | #include <xorg-config.h> |
| 3 | #endif |
| 4 | |
| 5 | #include <errno.h> |
| 6 | #include <string.h> |
| 7 | |
| 8 | #include "xf86.h" |
| 9 | #include "xf86_OSproc.h" |
| 10 | #include "xf86Pci.h" |
| 11 | #include "compiler.h" |
| 12 | #define _INT10_PRIVATE |
| 13 | #include "xf86int10.h" |
| 14 | |
| 15 | #define REG pInt |
| 16 | |
| 17 | #ifdef _VM86_LINUX |
| 18 | #include "int10Defines.h" |
| 19 | |
| 20 | static int vm86_rep(struct vm86_struct *ptr); |
| 21 | static struct vm86_struct vm86_s; |
| 22 | |
| 23 | Bool |
| 24 | xf86Int10ExecSetup(xf86Int10InfoPtr pInt) |
| 25 | { |
| 26 | #define VM86S ((struct vm86_struct *)pInt->cpuRegs) |
| 27 | |
| 28 | pInt->cpuRegs = &vm86_s; |
| 29 | VM86S->flags = 0; |
| 30 | VM86S->screen_bitmap = 0; |
| 31 | VM86S->cpu_type = CPU_586; |
| 32 | memset(&VM86S->int_revectored, 0xff, sizeof(VM86S->int_revectored)); |
| 33 | memset(&VM86S->int21_revectored, 0xff, sizeof(VM86S->int21_revectored)); |
| 34 | return TRUE; |
| 35 | } |
| 36 | |
| 37 | /* get the linear address */ |
| 38 | #define LIN_PREF_SI ((pref_seg << 4) + X86_SI) |
| 39 | #define LWECX ((prefix66 ^ prefix67) ? X86_ECX : X86_CX) |
| 40 | #define LWECX_ZERO {if (prefix66 ^ prefix67) X86_ECX = 0; else X86_CX = 0;} |
| 41 | #define DF (1 << 10) |
| 42 | |
| 43 | /* vm86 fault handling */ |
| 44 | static Bool |
| 45 | vm86_GP_fault(xf86Int10InfoPtr pInt) |
| 46 | { |
| 47 | unsigned char *csp, *lina; |
| 48 | CARD32 org_eip; |
| 49 | int pref_seg; |
| 50 | int done, is_rep, prefix66, prefix67; |
| 51 | |
| 52 | csp = lina = SEG_ADR((unsigned char *), X86_CS, IP); |
| 53 | |
| 54 | is_rep = 0; |
| 55 | prefix66 = prefix67 = 0; |
| 56 | pref_seg = -1; |
| 57 | |
| 58 | /* eat up prefixes */ |
| 59 | done = 0; |
| 60 | do { |
| 61 | switch (MEM_RB(pInt, (int) csp++)) { |
| 62 | case 0x66: /* operand prefix */ |
| 63 | prefix66 = 1; |
| 64 | break; |
| 65 | case 0x67: /* address prefix */ |
| 66 | prefix67 = 1; |
| 67 | break; |
| 68 | case 0x2e: /* CS */ |
| 69 | pref_seg = X86_CS; |
| 70 | break; |
| 71 | case 0x3e: /* DS */ |
| 72 | pref_seg = X86_DS; |
| 73 | break; |
| 74 | case 0x26: /* ES */ |
| 75 | pref_seg = X86_ES; |
| 76 | break; |
| 77 | case 0x36: /* SS */ |
| 78 | pref_seg = X86_SS; |
| 79 | break; |
| 80 | case 0x65: /* GS */ |
| 81 | pref_seg = X86_GS; |
| 82 | break; |
| 83 | case 0x64: /* FS */ |
| 84 | pref_seg = X86_FS; |
| 85 | break; |
| 86 | case 0xf0: /* lock */ |
| 87 | break; |
| 88 | case 0xf2: /* repnz */ |
| 89 | case 0xf3: /* rep */ |
| 90 | is_rep = 1; |
| 91 | break; |
| 92 | default: |
| 93 | done = 1; |
| 94 | } |
| 95 | } while (!done); |
| 96 | csp--; /* oops one too many */ |
| 97 | org_eip = X86_EIP; |
| 98 | X86_IP += (csp - lina); |
| 99 | |
| 100 | switch (MEM_RB(pInt, (int) csp)) { |
| 101 | case 0x6c: /* insb */ |
| 102 | /* NOTE: ES can't be overwritten; prefixes 66,67 should use esi,edi,ecx |
| 103 | * but is anyone using extended regs in real mode? */ |
| 104 | /* WARNING: no test for DI wrapping! */ |
| 105 | X86_EDI += port_rep_inb(pInt, X86_DX, SEG_EADR((CARD32), X86_ES, DI), |
| 106 | X86_FLAGS & DF, is_rep ? LWECX : 1); |
| 107 | if (is_rep) |
| 108 | LWECX_ZERO; |
| 109 | X86_IP++; |
| 110 | break; |
| 111 | |
| 112 | case 0x6d: /* (rep) insw / insd */ |
| 113 | /* NOTE: ES can't be overwritten */ |
| 114 | /* WARNING: no test for _DI wrapping! */ |
| 115 | if (prefix66) { |
| 116 | X86_DI += port_rep_inl(pInt, X86_DX, SEG_ADR((CARD32), X86_ES, DI), |
| 117 | X86_EFLAGS & DF, is_rep ? LWECX : 1); |
| 118 | } |
| 119 | else { |
| 120 | X86_DI += port_rep_inw(pInt, X86_DX, SEG_ADR((CARD32), X86_ES, DI), |
| 121 | X86_FLAGS & DF, is_rep ? LWECX : 1); |
| 122 | } |
| 123 | if (is_rep) |
| 124 | LWECX_ZERO; |
| 125 | X86_IP++; |
| 126 | break; |
| 127 | |
| 128 | case 0x6e: /* (rep) outsb */ |
| 129 | if (pref_seg < 0) |
| 130 | pref_seg = X86_DS; |
| 131 | /* WARNING: no test for _SI wrapping! */ |
| 132 | X86_SI += port_rep_outb(pInt, X86_DX, (CARD32) LIN_PREF_SI, |
| 133 | X86_FLAGS & DF, is_rep ? LWECX : 1); |
| 134 | if (is_rep) |
| 135 | LWECX_ZERO; |
| 136 | X86_IP++; |
| 137 | break; |
| 138 | |
| 139 | case 0x6f: /* (rep) outsw / outsd */ |
| 140 | if (pref_seg < 0) |
| 141 | pref_seg = X86_DS; |
| 142 | /* WARNING: no test for _SI wrapping! */ |
| 143 | if (prefix66) { |
| 144 | X86_SI += port_rep_outl(pInt, X86_DX, (CARD32) LIN_PREF_SI, |
| 145 | X86_EFLAGS & DF, is_rep ? LWECX : 1); |
| 146 | } |
| 147 | else { |
| 148 | X86_SI += port_rep_outw(pInt, X86_DX, (CARD32) LIN_PREF_SI, |
| 149 | X86_FLAGS & DF, is_rep ? LWECX : 1); |
| 150 | } |
| 151 | if (is_rep) |
| 152 | LWECX_ZERO; |
| 153 | X86_IP++; |
| 154 | break; |
| 155 | |
| 156 | case 0xe5: /* inw xx, inl xx */ |
| 157 | if (prefix66) |
| 158 | X86_EAX = x_inl(csp[1]); |
| 159 | else |
| 160 | X86_AX = x_inw(csp[1]); |
| 161 | X86_IP += 2; |
| 162 | break; |
| 163 | |
| 164 | case 0xe4: /* inb xx */ |
| 165 | X86_AL = x_inb(csp[1]); |
| 166 | X86_IP += 2; |
| 167 | break; |
| 168 | |
| 169 | case 0xed: /* inw dx, inl dx */ |
| 170 | if (prefix66) |
| 171 | X86_EAX = x_inl(X86_DX); |
| 172 | else |
| 173 | X86_AX = x_inw(X86_DX); |
| 174 | X86_IP += 1; |
| 175 | break; |
| 176 | |
| 177 | case 0xec: /* inb dx */ |
| 178 | X86_AL = x_inb(X86_DX); |
| 179 | X86_IP += 1; |
| 180 | break; |
| 181 | |
| 182 | case 0xe7: /* outw xx */ |
| 183 | if (prefix66) |
| 184 | x_outl(csp[1], X86_EAX); |
| 185 | else |
| 186 | x_outw(csp[1], X86_AX); |
| 187 | X86_IP += 2; |
| 188 | break; |
| 189 | |
| 190 | case 0xe6: /* outb xx */ |
| 191 | x_outb(csp[1], X86_AL); |
| 192 | X86_IP += 2; |
| 193 | break; |
| 194 | |
| 195 | case 0xef: /* outw dx */ |
| 196 | if (prefix66) |
| 197 | x_outl(X86_DX, X86_EAX); |
| 198 | else |
| 199 | x_outw(X86_DX, X86_AX); |
| 200 | X86_IP += 1; |
| 201 | break; |
| 202 | |
| 203 | case 0xee: /* outb dx */ |
| 204 | x_outb(X86_DX, X86_AL); |
| 205 | X86_IP += 1; |
| 206 | break; |
| 207 | |
| 208 | case 0xf4: |
| 209 | DebugF("hlt at %p\n", lina); |
| 210 | return FALSE; |
| 211 | |
| 212 | case 0x0f: |
| 213 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, |
| 214 | "CPU 0x0f Trap at CS:EIP=0x%4.4x:0x%8.8lx\n", X86_CS, |
| 215 | X86_EIP); |
| 216 | goto op0ferr; |
| 217 | |
| 218 | default: |
| 219 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, "unknown reason for exception\n"); |
| 220 | |
| 221 | op0ferr: |
| 222 | dump_registers(pInt); |
| 223 | stack_trace(pInt); |
| 224 | dump_code(pInt); |
| 225 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, "cannot continue\n"); |
| 226 | return FALSE; |
| 227 | } /* end of switch() */ |
| 228 | return TRUE; |
| 229 | } |
| 230 | |
| 231 | static int |
| 232 | do_vm86(xf86Int10InfoPtr pInt) |
| 233 | { |
| 234 | int retval, signo; |
| 235 | |
| 236 | xf86InterceptSignals(&signo); |
| 237 | retval = vm86_rep(VM86S); |
| 238 | xf86InterceptSignals(NULL); |
| 239 | |
| 240 | if (signo >= 0) { |
| 241 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, |
| 242 | "vm86() syscall generated signal %d.\n", signo); |
| 243 | dump_registers(pInt); |
| 244 | dump_code(pInt); |
| 245 | stack_trace(pInt); |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | switch (VM86_TYPE(retval)) { |
| 250 | case VM86_UNKNOWN: |
| 251 | if (!vm86_GP_fault(pInt)) |
| 252 | return 0; |
| 253 | break; |
| 254 | case VM86_STI: |
| 255 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, "vm86_sti :-((\n"); |
| 256 | dump_registers(pInt); |
| 257 | dump_code(pInt); |
| 258 | stack_trace(pInt); |
| 259 | return 0; |
| 260 | case VM86_INTx: |
| 261 | pInt->num = VM86_ARG(retval); |
| 262 | if (!int_handler(pInt)) { |
| 263 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, |
| 264 | "Unknown vm86_int: 0x%X\n\n", VM86_ARG(retval)); |
| 265 | dump_registers(pInt); |
| 266 | dump_code(pInt); |
| 267 | stack_trace(pInt); |
| 268 | return 0; |
| 269 | } |
| 270 | /* I'm not sure yet what to do if we can handle ints */ |
| 271 | break; |
| 272 | case VM86_SIGNAL: |
| 273 | return 1; |
| 274 | /* |
| 275 | * we used to warn here and bail out - but now the sigio stuff |
| 276 | * always fires signals at us. So we just ignore them for now. |
| 277 | */ |
| 278 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_WARNING, "received signal\n"); |
| 279 | return 0; |
| 280 | default: |
| 281 | xf86DrvMsg(pInt->pScrn->scrnIndex, X_ERROR, "unknown type(0x%x)=0x%x\n", |
| 282 | VM86_ARG(retval), VM86_TYPE(retval)); |
| 283 | dump_registers(pInt); |
| 284 | dump_code(pInt); |
| 285 | stack_trace(pInt); |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | return 1; |
| 290 | } |
| 291 | |
| 292 | void |
| 293 | xf86ExecX86int10(xf86Int10InfoPtr pInt) |
| 294 | { |
| 295 | int sig = setup_int(pInt); |
| 296 | |
| 297 | if (int_handler(pInt)) |
| 298 | while (do_vm86(pInt)) { |
| 299 | }; |
| 300 | |
| 301 | finish_int(pInt, sig); |
| 302 | } |
| 303 | |
| 304 | static int |
| 305 | vm86_rep(struct vm86_struct *ptr) |
| 306 | { |
| 307 | int __res; |
| 308 | |
| 309 | #ifdef __PIC__ |
| 310 | /* When compiling with -fPIC, we can't use asm constraint "b" because |
| 311 | %ebx is already taken by gcc. */ |
| 312 | __asm__ __volatile__("pushl %%ebx\n\t" |
| 313 | "push %%gs\n\t" |
| 314 | "movl %2,%%ebx\n\t" |
| 315 | "movl %1,%%eax\n\t" |
| 316 | "int $0x80\n\t" "pop %%gs\n\t" "popl %%ebx":"=a"(__res) |
| 317 | :"n"((int) 113), "r"((struct vm86_struct *) ptr)); |
| 318 | #else |
| 319 | __asm__ __volatile__("push %%gs\n\t" |
| 320 | "int $0x80\n\t" |
| 321 | "pop %%gs":"=a"(__res):"a"((int) 113), |
| 322 | "b"((struct vm86_struct *) ptr)); |
| 323 | #endif |
| 324 | |
| 325 | if (__res < 0) { |
| 326 | errno = -__res; |
| 327 | __res = -1; |
| 328 | } |
| 329 | else |
| 330 | errno = 0; |
| 331 | return __res; |
| 332 | } |
| 333 | |
| 334 | #endif |