1 2 /*--------------------------------------------------------------------*/ 3 /*--- Doing syscalls. m_syscall.c ---*/ 4 /*--------------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2000-2012 Julian Seward 11 jseward (at) acm.org 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26 02111-1307, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 */ 30 31 #include "pub_core_basics.h" 32 #include "pub_core_libcassert.h" 33 #include "pub_core_vki.h" 34 #include "pub_core_vkiscnums.h" 35 #include "pub_core_syscall.h" 36 37 /* --------------------------------------------------------------------- 38 Building syscall return values. 39 ------------------------------------------------------------------ */ 40 41 #if defined(VGO_linux) 42 43 /* Make a SysRes value from a syscall return value. This is 44 Linux-specific. 45 46 From: 47 http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/unix/sysv/ 48 linux/i386/sysdep.h? 49 rev=1.28&content-type=text/x-cvsweb-markup&cvsroot=glibc 50 51 Linux uses a negative return value to indicate syscall errors, 52 unlike most Unices, which use the condition codes' carry flag. 53 54 Since version 2.1 the return value of a system call might be 55 negative even if the call succeeded. E.g., the 'lseek' system call 56 might return a large offset. Therefore we must not anymore test 57 for < 0, but test for a real error by making sure the value in %eax 58 is a real error number. Linus said he will make sure the no 59 syscall returns a value in -1 .. -4095 as a valid result so we can 60 safely test with -4095. 61 */ 62 63 SysRes VG_(mk_SysRes_x86_linux) ( Int val ) { 64 SysRes res; 65 res._valEx = 0; /* unused except on mips-linux */ 66 res._isError = val >= -4095 && val <= -1; 67 if (res._isError) { 68 res._val = (UInt)(-val); 69 } else { 70 res._val = (UInt)val; 71 } 72 return res; 73 } 74 75 /* Similarly .. */ 76 SysRes VG_(mk_SysRes_amd64_linux) ( Long val ) { 77 SysRes res; 78 res._valEx = 0; /* unused except on mips-linux */ 79 res._isError = val >= -4095 && val <= -1; 80 if (res._isError) { 81 res._val = (ULong)(-val); 82 } else { 83 res._val = (ULong)val; 84 } 85 return res; 86 } 87 88 /* PPC uses the CR7.SO bit to flag an error (CR0 in IBM-speak) */ 89 /* Note this must be in the bottom bit of the second arg */ 90 SysRes VG_(mk_SysRes_ppc32_linux) ( UInt val, UInt cr0so ) { 91 SysRes res; 92 res._valEx = 0; /* unused except on mips-linux */ 93 res._isError = (cr0so & 1) != 0; 94 res._val = val; 95 return res; 96 } 97 98 /* As per ppc32 version, cr0.so must be in l.s.b. of 2nd arg */ 99 SysRes VG_(mk_SysRes_ppc64_linux) ( ULong val, ULong cr0so ) { 100 SysRes res; 101 res._valEx = 0; /* unused except on mips-linux */ 102 res._isError = (cr0so & 1) != 0; 103 res._val = val; 104 return res; 105 } 106 107 SysRes VG_(mk_SysRes_s390x_linux) ( Long val ) { 108 SysRes res; 109 res._valEx = 0; /* unused except on mips-linux */ 110 res._isError = val >= -4095 && val <= -1; 111 if (res._isError) { 112 res._val = -val; 113 } else { 114 res._val = val; 115 } 116 return res; 117 } 118 119 SysRes VG_(mk_SysRes_arm_linux) ( Int val ) { 120 SysRes res; 121 res._valEx = 0; /* unused except on mips-linux */ 122 res._isError = val >= -4095 && val <= -1; 123 if (res._isError) { 124 res._val = (UInt)(-val); 125 } else { 126 res._val = (UInt)val; 127 } 128 return res; 129 } 130 131 /* MIPS uses a3 != 0 to flag an error */ 132 SysRes VG_(mk_SysRes_mips32_linux) ( UWord v0, UWord v1, UWord a3 ) { 133 SysRes res; 134 res._isError = (a3 != (UWord)0); 135 res._val = v0; 136 res._valEx = v1; 137 return res; 138 } 139 140 /* Generic constructors. */ 141 SysRes VG_(mk_SysRes_Error) ( UWord err ) { 142 SysRes r; 143 r._valEx = 0; /* unused except on mips-linux */ 144 r._isError = True; 145 r._val = err; 146 return r; 147 } 148 149 SysRes VG_(mk_SysRes_Success) ( UWord res ) { 150 SysRes r; 151 r._valEx = 0; /* unused except on mips-linux */ 152 r._isError = False; 153 r._val = res; 154 return r; 155 } 156 157 158 #elif defined(VGO_darwin) 159 160 /* Darwin: Some syscalls return a double-word result. */ 161 SysRes VG_(mk_SysRes_x86_darwin) ( UChar scclass, Bool isErr, 162 UInt wHI, UInt wLO ) 163 { 164 SysRes res; 165 res._wHI = 0; 166 res._wLO = 0; 167 res._mode = 0; /* invalid */ 168 vg_assert(isErr == False || isErr == True); 169 vg_assert(sizeof(UWord) == sizeof(UInt)); 170 switch (scclass) { 171 case VG_DARWIN_SYSCALL_CLASS_UNIX: 172 res._wLO = wLO; 173 res._wHI = wHI; 174 res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; 175 break; 176 case VG_DARWIN_SYSCALL_CLASS_MACH: 177 vg_assert(!isErr); 178 vg_assert(wHI == 0); 179 res._wLO = wLO; 180 res._mode = SysRes_MACH; 181 break; 182 case VG_DARWIN_SYSCALL_CLASS_MDEP: 183 vg_assert(!isErr); 184 vg_assert(wHI == 0); 185 res._wLO = wLO; 186 res._mode = SysRes_MDEP; 187 break; 188 default: 189 vg_assert(0); 190 } 191 return res; 192 } 193 194 SysRes VG_(mk_SysRes_amd64_darwin) ( UChar scclass, Bool isErr, 195 ULong wHI, ULong wLO ) 196 { 197 SysRes res; 198 res._wHI = 0; 199 res._wLO = 0; 200 res._mode = 0; /* invalid */ 201 vg_assert(isErr == False || isErr == True); 202 vg_assert(sizeof(UWord) == sizeof(ULong)); 203 switch (scclass) { 204 case VG_DARWIN_SYSCALL_CLASS_UNIX: 205 res._wLO = wLO; 206 res._wHI = wHI; 207 res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; 208 break; 209 case VG_DARWIN_SYSCALL_CLASS_MACH: 210 vg_assert(!isErr); 211 vg_assert(wHI == 0); 212 res._wLO = wLO; 213 res._mode = SysRes_MACH; 214 break; 215 case VG_DARWIN_SYSCALL_CLASS_MDEP: 216 vg_assert(!isErr); 217 vg_assert(wHI == 0); 218 res._wLO = wLO; 219 res._mode = SysRes_MDEP; 220 break; 221 default: 222 vg_assert(0); 223 } 224 return res; 225 } 226 227 /* Generic constructors. We assume (without checking if this makes 228 any sense, from the caller's point of view) that these are for the 229 UNIX style of syscall. */ 230 SysRes VG_(mk_SysRes_Error) ( UWord err ) { 231 SysRes r; 232 r._wHI = 0; 233 r._wLO = err; 234 r._mode = SysRes_UNIX_ERR; 235 return r; 236 } 237 238 SysRes VG_(mk_SysRes_Success) ( UWord res ) { 239 SysRes r; 240 r._wHI = 0; 241 r._wLO = res; 242 r._mode = SysRes_UNIX_OK; 243 return r; 244 } 245 246 247 #else 248 # error "Unknown OS" 249 #endif 250 251 252 /* --------------------------------------------------------------------- 253 VG_(do_syscall): A function for doing syscalls. 254 ------------------------------------------------------------------ */ 255 256 #if defined(VGP_x86_linux) 257 /* Incoming args (syscall number + up to 6 args) come on the stack. 258 (ie. the C calling convention). 259 260 The syscall number goes in %eax. The args are passed to the syscall in 261 the regs %ebx, %ecx, %edx, %esi, %edi, %ebp, ie. the kernel's syscall 262 calling convention. 263 264 %eax gets the return value. Not sure which registers the kernel 265 clobbers, so we preserve all the callee-save regs (%esi, %edi, %ebx, 266 %ebp). 267 */ 268 extern UWord do_syscall_WRK ( 269 UWord syscall_no, 270 UWord a1, UWord a2, UWord a3, 271 UWord a4, UWord a5, UWord a6 272 ); 273 asm( 274 ".text\n" 275 ".globl do_syscall_WRK\n" 276 "do_syscall_WRK:\n" 277 " push %esi\n" 278 " push %edi\n" 279 " push %ebx\n" 280 " push %ebp\n" 281 " movl 16+ 4(%esp),%eax\n" 282 " movl 16+ 8(%esp),%ebx\n" 283 " movl 16+12(%esp),%ecx\n" 284 " movl 16+16(%esp),%edx\n" 285 " movl 16+20(%esp),%esi\n" 286 " movl 16+24(%esp),%edi\n" 287 " movl 16+28(%esp),%ebp\n" 288 " int $0x80\n" 289 " popl %ebp\n" 290 " popl %ebx\n" 291 " popl %edi\n" 292 " popl %esi\n" 293 " ret\n" 294 ".previous\n" 295 ); 296 297 #elif defined(VGP_amd64_linux) 298 /* Incoming args (syscall number + up to 6 args) come in %rdi, %rsi, 299 %rdx, %rcx, %r8, %r9, and the last one on the stack (ie. the C 300 calling convention). 301 302 The syscall number goes in %rax. The args are passed to the syscall in 303 the regs %rdi, %rsi, %rdx, %r10, %r8, %r9 (yes, really %r10, not %rcx), 304 ie. the kernel's syscall calling convention. 305 306 %rax gets the return value. %rcx and %r11 are clobbered by the syscall; 307 no matter, they are caller-save (the syscall clobbers no callee-save 308 regs, so we don't have to do any register saving/restoring). 309 */ 310 extern UWord do_syscall_WRK ( 311 UWord syscall_no, 312 UWord a1, UWord a2, UWord a3, 313 UWord a4, UWord a5, UWord a6 314 ); 315 asm( 316 ".text\n" 317 ".globl do_syscall_WRK\n" 318 "do_syscall_WRK:\n" 319 /* Convert function calling convention --> syscall calling 320 convention */ 321 " movq %rdi, %rax\n" 322 " movq %rsi, %rdi\n" 323 " movq %rdx, %rsi\n" 324 " movq %rcx, %rdx\n" 325 " movq %r8, %r10\n" 326 " movq %r9, %r8\n" 327 " movq 8(%rsp), %r9\n" /* last arg from stack */ 328 " syscall\n" 329 " ret\n" 330 ".previous\n" 331 ); 332 333 #elif defined(VGP_ppc32_linux) 334 /* Incoming args (syscall number + up to 6 args) come in %r3:%r9. 335 336 The syscall number goes in %r0. The args are passed to the syscall in 337 the regs %r3:%r8, i.e. the kernel's syscall calling convention. 338 339 The %cr0.so bit flags an error. 340 We return the syscall return value in %r3, and the %cr0.so in 341 the lowest bit of %r4. 342 We return a ULong, of which %r3 is the high word, and %r4 the low. 343 No callee-save regs are clobbered, so no saving/restoring is needed. 344 */ 345 extern ULong do_syscall_WRK ( 346 UWord syscall_no, 347 UWord a1, UWord a2, UWord a3, 348 UWord a4, UWord a5, UWord a6 349 ); 350 asm( 351 ".text\n" 352 ".globl do_syscall_WRK\n" 353 "do_syscall_WRK:\n" 354 " mr 0,3\n" 355 " mr 3,4\n" 356 " mr 4,5\n" 357 " mr 5,6\n" 358 " mr 6,7\n" 359 " mr 7,8\n" 360 " mr 8,9\n" 361 " sc\n" /* syscall: sets %cr0.so on error */ 362 " mfcr 4\n" /* %cr -> low word of return var */ 363 " rlwinm 4,4,4,31,31\n" /* rotate flag bit so to lsb, and mask it */ 364 " blr\n" /* and return */ 365 ".previous\n" 366 ); 367 368 #elif defined(VGP_ppc64_linux) 369 /* Due to the need to return 65 bits of result, this is completely 370 different from the ppc32 case. The single arg register points to a 371 7-word block containing the syscall # and the 6 args. The syscall 372 result proper is put in [0] of the block, and %cr0.so is in the 373 bottom bit of [1]. */ 374 extern void do_syscall_WRK ( ULong* argblock ); 375 asm( 376 ".align 2\n" 377 ".globl do_syscall_WRK\n" 378 ".section \".opd\",\"aw\"\n" 379 ".align 3\n" 380 "do_syscall_WRK:\n" 381 ".quad .do_syscall_WRK,.TOC.@tocbase,0\n" 382 ".previous\n" 383 ".type .do_syscall_WRK,@function\n" 384 ".globl .do_syscall_WRK\n" 385 ".do_syscall_WRK:\n" 386 " std 3,-16(1)\n" /* stash arg */ 387 " ld 8, 48(3)\n" /* sc arg 6 */ 388 " ld 7, 40(3)\n" /* sc arg 5 */ 389 " ld 6, 32(3)\n" /* sc arg 4 */ 390 " ld 5, 24(3)\n" /* sc arg 3 */ 391 " ld 4, 16(3)\n" /* sc arg 2 */ 392 " ld 0, 0(3)\n" /* sc number */ 393 " ld 3, 8(3)\n" /* sc arg 1 */ 394 " sc\n" /* result in r3 and cr0.so */ 395 " ld 5,-16(1)\n" /* reacquire argblock ptr (r5 is caller-save) */ 396 " std 3,0(5)\n" /* argblock[0] = r3 */ 397 " mfcr 3\n" 398 " srwi 3,3,28\n" 399 " andi. 3,3,1\n" 400 " std 3,8(5)\n" /* argblock[1] = cr0.s0 & 1 */ 401 " blr\n" 402 ); 403 404 #elif defined(VGP_arm_linux) 405 /* I think the conventions are: 406 args in r0 r1 r2 r3 r4 r5 407 sysno in r7 408 return value in r0, w/ same conventions as x86-linux, viz r0 in 409 -4096 .. -1 is an error value. All other values are success 410 values. 411 */ 412 extern UWord do_syscall_WRK ( 413 UWord a1, UWord a2, UWord a3, 414 UWord a4, UWord a5, UWord a6, 415 UWord syscall_no 416 ); 417 asm( 418 ".text\n" 419 ".globl do_syscall_WRK\n" 420 "do_syscall_WRK:\n" 421 " push {r4, r5, r7}\n" 422 " ldr r4, [sp, #12]\n" 423 " ldr r5, [sp, #16]\n" 424 " ldr r7, [sp, #20]\n" 425 " svc 0x0\n" 426 " pop {r4, r5, r7}\n" 427 " bx lr\n" 428 ".previous\n" 429 ); 430 431 #elif defined(VGP_x86_darwin) 432 433 /* Incoming args (syscall number + up to 8 args) come in on the stack 434 435 The kernel's syscall calling convention is: 436 * the syscall number goes in eax 437 * the args are passed to the syscall on the stack, 438 pushed onto the stack R->L (that is, the usual x86 439 calling conventions, with the leftmost arg at the lowest 440 address) 441 Call instruction: 442 * UNIX: sysenter 443 * UNIX: int $0x80 444 * MACH: int $0x81 445 * MDEP: int $0x82 446 Note that the call type can be determined from the syscall number; 447 there is no need to inspect the actual instruction. Although obviously 448 the instruction must match. 449 Return value: 450 * MACH,MDEP: the return value comes back in eax 451 * UNIX: the return value comes back in edx:eax (hi32:lo32) 452 Error: 453 * MACH,MDEP: no error is returned 454 * UNIX: the carry flag indicates success or failure 455 456 nb here, sizeof(UWord) == sizeof(UInt) 457 */ 458 459 __private_extern__ ULong 460 do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 461 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 462 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 463 UWord syscall_no, /* 36(esp) */ 464 /*OUT*/UInt* errflag /* 40(esp) */ ); 465 // Unix syscall: 64-bit return in edx:eax, with LSB in eax 466 // error indicated by carry flag: clear=good, set=bad 467 asm(".private_extern _do_syscall_unix_WRK\n" 468 "_do_syscall_unix_WRK:\n" 469 " movl 40(%esp), %ecx \n" /* assume syscall success */ 470 " movl $0, (%ecx) \n" 471 " movl 36(%esp), %eax \n" 472 " int $0x80 \n" 473 " jnc 1f \n" /* jump if success */ 474 " movl 40(%esp), %ecx \n" /* syscall failed - set *errflag */ 475 " movl $1, (%ecx) \n" 476 " 1: ret \n" 477 ); 478 479 __private_extern__ UInt 480 do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 481 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 482 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 483 UWord syscall_no /* 36(esp) */ ); 484 // Mach trap: 32-bit result in %eax, no error flag 485 asm(".private_extern _do_syscall_mach_WRK\n" 486 "_do_syscall_mach_WRK:\n" 487 " movl 36(%esp), %eax \n" 488 " int $0x81 \n" 489 " ret \n" 490 ); 491 492 __private_extern__ UInt 493 do_syscall_mdep_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 494 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 495 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 496 UWord syscall_no /* 36(esp) */ ); 497 // mdep trap: 32-bit result in %eax, no error flag 498 asm( 499 ".private_extern _do_syscall_mdep_WRK\n" 500 "_do_syscall_mdep_WRK:\n" 501 " movl 36(%esp), %eax \n" 502 " int $0x82 \n" 503 " ret \n" 504 ); 505 506 507 #elif defined(VGP_amd64_darwin) 508 509 /* Incoming args (syscall number + up to 8 args) come in registers and stack 510 511 The kernel's syscall calling convention is: 512 * the syscall number goes in rax 513 * the args are passed to the syscall in registers and the stack 514 * the call instruction is 'syscall' 515 Return value: 516 * MACH,MDEP: the return value comes back in rax 517 * UNIX: the return value comes back in rdx:rax (hi64:lo64) 518 Error: 519 * MACH,MDEP: no error is returned 520 * UNIX: the carry flag indicates success or failure 521 522 nb here, sizeof(UWord) == sizeof(ULong) 523 */ 524 525 __private_extern__ UWord 526 do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ 527 UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ 528 UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ 529 UWord syscall_no, /* 24(rsp) */ 530 /*OUT*/ULong* errflag, /* 32(rsp) */ 531 /*OUT*/ULong* res2 ); /* 40(rsp) */ 532 // Unix syscall: 128-bit return in rax:rdx, with LSB in rax 533 // error indicated by carry flag: clear=good, set=bad 534 asm(".private_extern _do_syscall_unix_WRK\n" 535 "_do_syscall_unix_WRK:\n" 536 " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ 537 " movq 32(%rsp), %rax \n" /* assume syscall success */ 538 " movq $0, (%rax) \n" 539 " movq 24(%rsp), %rax \n" /* load syscall_no */ 540 " syscall \n" 541 " jnc 1f \n" /* jump if success */ 542 " movq 32(%rsp), %rcx \n" /* syscall failed - set *errflag */ 543 " movq $1, (%rcx) \n" 544 " 1: movq 40(%rsp), %rcx \n" /* save 2nd result word */ 545 " movq %rdx, (%rcx) \n" 546 " retq \n" /* return 1st result word */ 547 ); 548 549 __private_extern__ UWord 550 do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ 551 UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ 552 UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ 553 UWord syscall_no ); /* 24(rsp) */ 554 // Mach trap: 64-bit result, no error flag 555 asm(".private_extern _do_syscall_mach_WRK\n" 556 "_do_syscall_mach_WRK:\n" 557 " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ 558 " movq 24(%rsp), %rax \n" /* load syscall_no */ 559 " syscall \n" 560 " retq \n" 561 ); 562 563 #elif defined(VGP_s390x_linux) 564 565 static UWord do_syscall_WRK ( 566 UWord syscall_no, 567 UWord arg1, UWord arg2, UWord arg3, 568 UWord arg4, UWord arg5, UWord arg6 569 ) 570 { 571 register UWord __arg1 asm("2") = arg1; 572 register UWord __arg2 asm("3") = arg2; 573 register UWord __arg3 asm("4") = arg3; 574 register UWord __arg4 asm("5") = arg4; 575 register UWord __arg5 asm("6") = arg5; 576 register UWord __arg6 asm("7") = arg6; 577 register ULong __svcres asm("2"); 578 579 __asm__ __volatile__ ( 580 "lgr %%r1,%1\n\t" 581 "svc 0\n\t" 582 : "=d" (__svcres) 583 : "a" (syscall_no), 584 "0" (__arg1), 585 "d" (__arg2), 586 "d" (__arg3), 587 "d" (__arg4), 588 "d" (__arg5), 589 "d" (__arg6) 590 : "1", "cc", "memory"); 591 592 return (UWord) (__svcres); 593 } 594 595 #elif defined(VGP_mips32_linux) 596 /* Incoming args (syscall number + up to 6 args) come in a0 - a3 and stack. 597 598 The syscall number goes in v0. The args are passed to the syscall in 599 the regs a0 - a3 and stack, i.e. the kernel's syscall calling convention. 600 601 (a3 != 0) flags an error. 602 We return the syscall return value in v0. 603 MIPS version 604 */ 605 extern int do_syscall_WRK ( 606 int a1, int a2, int a3, 607 int a4, int a5, int a6, int syscall_no, UWord *err, 608 UWord *valHi, UWord* valLo 609 ); 610 asm( 611 ".globl do_syscall_WRK\n" 612 ".ent do_syscall_WRK\n" 613 ".text\n" 614 "do_syscall_WRK:\n" 615 " lw $2, 24($29)\n" 616 " syscall\n" 617 " lw $8, 28($29)\n" 618 " sw $7, ($8)\n" 619 " lw $8, 32($29)\n" 620 " sw $3, ($8)\n" // store valHi 621 " lw $8, 36($29)\n" 622 " sw $2, ($8)\n" // store valLo 623 " jr $31\n" 624 " nop\n" 625 ".previous\n" 626 ".end do_syscall_WRK\n" 627 ); 628 629 #else 630 # error Unknown platform 631 #endif 632 633 634 /* Finally, the generic code. This sends the call to the right 635 helper. */ 636 637 SysRes VG_(do_syscall) ( UWord sysno, UWord a1, UWord a2, UWord a3, 638 UWord a4, UWord a5, UWord a6, 639 UWord a7, UWord a8 ) 640 { 641 # if defined(VGP_x86_linux) 642 UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 643 return VG_(mk_SysRes_x86_linux)( val ); 644 645 # elif defined(VGP_amd64_linux) 646 UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 647 return VG_(mk_SysRes_amd64_linux)( val ); 648 649 # elif defined(VGP_ppc32_linux) 650 ULong ret = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 651 UInt val = (UInt)(ret>>32); 652 UInt cr0so = (UInt)(ret); 653 return VG_(mk_SysRes_ppc32_linux)( val, cr0so ); 654 655 # elif defined(VGP_ppc64_linux) 656 ULong argblock[7]; 657 argblock[0] = sysno; 658 argblock[1] = a1; 659 argblock[2] = a2; 660 argblock[3] = a3; 661 argblock[4] = a4; 662 argblock[5] = a5; 663 argblock[6] = a6; 664 do_syscall_WRK( &argblock[0] ); 665 return VG_(mk_SysRes_ppc64_linux)( argblock[0], argblock[1] ); 666 667 # elif defined(VGP_arm_linux) 668 UWord val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno); 669 return VG_(mk_SysRes_arm_linux)( val ); 670 671 # elif defined(VGP_x86_darwin) 672 UInt wLO = 0, wHI = 0, err = 0; 673 ULong u64; 674 UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); 675 switch (scclass) { 676 case VG_DARWIN_SYSCALL_CLASS_UNIX: 677 u64 = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 678 VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err); 679 wLO = (UInt)u64; 680 wHI = (UInt)(u64 >> 32); 681 break; 682 case VG_DARWIN_SYSCALL_CLASS_MACH: 683 wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 684 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 685 err = 0; 686 break; 687 case VG_DARWIN_SYSCALL_CLASS_MDEP: 688 wLO = do_syscall_mdep_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 689 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 690 err = 0; 691 break; 692 default: 693 vg_assert(0); 694 break; 695 } 696 return VG_(mk_SysRes_x86_darwin)( scclass, err ? True : False, wHI, wLO ); 697 698 # elif defined(VGP_amd64_darwin) 699 ULong wLO = 0, wHI = 0, err = 0; 700 UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); 701 switch (scclass) { 702 case VG_DARWIN_SYSCALL_CLASS_UNIX: 703 wLO = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 704 VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err, &wHI); 705 break; 706 case VG_DARWIN_SYSCALL_CLASS_MACH: 707 case VG_DARWIN_SYSCALL_CLASS_MDEP: 708 wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 709 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 710 err = 0; 711 break; 712 default: 713 vg_assert(0); 714 break; 715 } 716 return VG_(mk_SysRes_amd64_darwin)( scclass, err ? True : False, wHI, wLO ); 717 718 #elif defined(VGP_s390x_linux) 719 UWord val; 720 721 if (sysno == __NR_mmap) { 722 ULong argbuf[6]; 723 724 argbuf[0] = a1; 725 argbuf[1] = a2; 726 argbuf[2] = a3; 727 argbuf[3] = a4; 728 argbuf[4] = a5; 729 argbuf[5] = a6; 730 val = do_syscall_WRK(sysno,(UWord)&argbuf[0],0,0,0,0,0); 731 } else { 732 val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 733 } 734 735 return VG_(mk_SysRes_s390x_linux)( val ); 736 737 #elif defined(VGP_mips32_linux) 738 UWord err = 0; 739 UWord valHi = 0; 740 UWord valLo = 0; 741 (void) do_syscall_WRK(a1,a2,a3,a4,a5,a6, sysno,&err,&valHi,&valLo); 742 return VG_(mk_SysRes_mips32_linux)( valLo, valHi, (ULong)err ); 743 #else 744 # error Unknown platform 745 #endif 746 } 747 748 /* --------------------------------------------------------------------- 749 Names of errors. 750 ------------------------------------------------------------------ */ 751 752 /* Return a string which gives the name of an error value. Note, 753 unlike the standard C syserror fn, the returned string is not 754 malloc-allocated or writable -- treat it as a constant. 755 TODO: implement this properly. */ 756 757 const HChar* VG_(strerror) ( UWord errnum ) 758 { 759 switch (errnum) { 760 case VKI_EPERM: return "Operation not permitted"; 761 case VKI_ENOENT: return "No such file or directory"; 762 case VKI_ESRCH: return "No such process"; 763 case VKI_EINTR: return "Interrupted system call"; 764 case VKI_EIO: return "Input/output error"; 765 case VKI_ENXIO: return "No such device or address"; 766 case VKI_E2BIG: return "Argument list too long"; 767 case VKI_ENOEXEC: return "Exec format error"; 768 case VKI_EBADF: return "Bad file descriptor"; 769 case VKI_ECHILD: return "No child processes"; 770 case VKI_EAGAIN: return "Resource temporarily unavailable"; 771 case VKI_ENOMEM: return "Cannot allocate memory"; 772 case VKI_EACCES: return "Permission denied"; 773 case VKI_EFAULT: return "Bad address"; 774 case VKI_ENOTBLK: return "Block device required"; 775 case VKI_EBUSY: return "Device or resource busy"; 776 case VKI_EEXIST: return "File exists"; 777 case VKI_EXDEV: return "Invalid cross-device link"; 778 case VKI_ENODEV: return "No such device"; 779 case VKI_ENOTDIR: return "Not a directory"; 780 case VKI_EISDIR: return "Is a directory"; 781 case VKI_EINVAL: return "Invalid argument"; 782 case VKI_ENFILE: return "Too many open files in system"; 783 case VKI_EMFILE: return "Too many open files"; 784 case VKI_ENOTTY: return "Inappropriate ioctl for device"; 785 case VKI_ETXTBSY: return "Text file busy"; 786 case VKI_EFBIG: return "File too large"; 787 case VKI_ENOSPC: return "No space left on device"; 788 case VKI_ESPIPE: return "Illegal seek"; 789 case VKI_EROFS: return "Read-only file system"; 790 case VKI_EMLINK: return "Too many links"; 791 case VKI_EPIPE: return "Broken pipe"; 792 case VKI_EDOM: return "Numerical argument out of domain"; 793 case VKI_ERANGE: return "Numerical result out of range"; 794 795 case VKI_ENOSYS: return "Function not implemented"; 796 case VKI_EOVERFLOW: return "Value too large for defined data type"; 797 # if defined(VKI_ERESTARTSYS) 798 case VKI_ERESTARTSYS: return "ERESTARTSYS"; 799 # endif 800 default: return "VG_(strerror): unknown error"; 801 } 802 } 803 804 805 /*--------------------------------------------------------------------*/ 806 /*--- end ---*/ 807 /*--------------------------------------------------------------------*/ 808
