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) 2000-2011 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._isError = val >= -4095 && val <= -1; 66 if (res._isError) { 67 res._val = (UInt)(-val); 68 } else { 69 res._val = (UInt)val; 70 } 71 return res; 72 } 73 74 /* Similarly .. */ 75 SysRes VG_(mk_SysRes_amd64_linux) ( Long val ) { 76 SysRes res; 77 res._isError = val >= -4095 && val <= -1; 78 if (res._isError) { 79 res._val = (ULong)(-val); 80 } else { 81 res._val = (ULong)val; 82 } 83 return res; 84 } 85 86 /* PPC uses the CR7.SO bit to flag an error (CR0 in IBM-speak) */ 87 /* Note this must be in the bottom bit of the second arg */ 88 SysRes VG_(mk_SysRes_ppc32_linux) ( UInt val, UInt cr0so ) { 89 SysRes res; 90 res._isError = (cr0so & 1) != 0; 91 res._val = val; 92 return res; 93 } 94 95 /* As per ppc32 version, cr0.so must be in l.s.b. of 2nd arg */ 96 SysRes VG_(mk_SysRes_ppc64_linux) ( ULong val, ULong cr0so ) { 97 SysRes res; 98 res._isError = (cr0so & 1) != 0; 99 res._val = val; 100 return res; 101 } 102 103 SysRes VG_(mk_SysRes_s390x_linux) ( Long val ) { 104 SysRes res; 105 res._isError = val >= -4095 && val <= -1; 106 if (res._isError) { 107 res._val = -val; 108 } else { 109 res._val = val; 110 } 111 return res; 112 } 113 114 SysRes VG_(mk_SysRes_arm_linux) ( Int val ) { 115 SysRes res; 116 res._isError = val >= -4095 && val <= -1; 117 if (res._isError) { 118 res._val = (UInt)(-val); 119 } else { 120 res._val = (UInt)val; 121 } 122 return res; 123 } 124 125 /* Generic constructors. */ 126 SysRes VG_(mk_SysRes_Error) ( UWord err ) { 127 SysRes r; 128 r._isError = True; 129 r._val = err; 130 return r; 131 } 132 133 SysRes VG_(mk_SysRes_Success) ( UWord res ) { 134 SysRes r; 135 r._isError = False; 136 r._val = res; 137 return r; 138 } 139 140 141 #elif defined(VGO_darwin) 142 143 /* Darwin: Some syscalls return a double-word result. */ 144 SysRes VG_(mk_SysRes_x86_darwin) ( UChar scclass, Bool isErr, 145 UInt wHI, UInt wLO ) 146 { 147 SysRes res; 148 res._wHI = 0; 149 res._wLO = 0; 150 res._mode = 0; /* invalid */ 151 vg_assert(isErr == False || isErr == True); 152 vg_assert(sizeof(UWord) == sizeof(UInt)); 153 switch (scclass) { 154 case VG_DARWIN_SYSCALL_CLASS_UNIX: 155 res._wLO = wLO; 156 res._wHI = wHI; 157 res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; 158 break; 159 case VG_DARWIN_SYSCALL_CLASS_MACH: 160 vg_assert(!isErr); 161 vg_assert(wHI == 0); 162 res._wLO = wLO; 163 res._mode = SysRes_MACH; 164 break; 165 case VG_DARWIN_SYSCALL_CLASS_MDEP: 166 vg_assert(!isErr); 167 vg_assert(wHI == 0); 168 res._wLO = wLO; 169 res._mode = SysRes_MDEP; 170 break; 171 default: 172 vg_assert(0); 173 } 174 return res; 175 } 176 177 SysRes VG_(mk_SysRes_amd64_darwin) ( UChar scclass, Bool isErr, 178 ULong wHI, ULong wLO ) 179 { 180 SysRes res; 181 res._wHI = 0; 182 res._wLO = 0; 183 res._mode = 0; /* invalid */ 184 vg_assert(isErr == False || isErr == True); 185 vg_assert(sizeof(UWord) == sizeof(ULong)); 186 switch (scclass) { 187 case VG_DARWIN_SYSCALL_CLASS_UNIX: 188 res._wLO = wLO; 189 res._wHI = wHI; 190 res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; 191 break; 192 case VG_DARWIN_SYSCALL_CLASS_MACH: 193 vg_assert(!isErr); 194 vg_assert(wHI == 0); 195 res._wLO = wLO; 196 res._mode = SysRes_MACH; 197 break; 198 case VG_DARWIN_SYSCALL_CLASS_MDEP: 199 vg_assert(!isErr); 200 vg_assert(wHI == 0); 201 res._wLO = wLO; 202 res._mode = SysRes_MDEP; 203 break; 204 default: 205 vg_assert(0); 206 } 207 return res; 208 } 209 210 /* Generic constructors. We assume (without checking if this makes 211 any sense, from the caller's point of view) that these are for the 212 UNIX style of syscall. */ 213 SysRes VG_(mk_SysRes_Error) ( UWord err ) { 214 SysRes r; 215 r._wHI = 0; 216 r._wLO = err; 217 r._mode = SysRes_UNIX_ERR; 218 return r; 219 } 220 221 SysRes VG_(mk_SysRes_Success) ( UWord res ) { 222 SysRes r; 223 r._wHI = 0; 224 r._wLO = res; 225 r._mode = SysRes_UNIX_OK; 226 return r; 227 } 228 229 230 #else 231 # error "Unknown OS" 232 #endif 233 234 235 /* --------------------------------------------------------------------- 236 VG_(do_syscall): A function for doing syscalls. 237 ------------------------------------------------------------------ */ 238 239 #if defined(VGP_x86_linux) 240 /* Incoming args (syscall number + up to 6 args) come on the stack. 241 (ie. the C calling convention). 242 243 The syscall number goes in %eax. The args are passed to the syscall in 244 the regs %ebx, %ecx, %edx, %esi, %edi, %ebp, ie. the kernel's syscall 245 calling convention. 246 247 %eax gets the return value. Not sure which registers the kernel 248 clobbers, so we preserve all the callee-save regs (%esi, %edi, %ebx, 249 %ebp). 250 */ 251 extern UWord do_syscall_WRK ( 252 UWord syscall_no, 253 UWord a1, UWord a2, UWord a3, 254 UWord a4, UWord a5, UWord a6 255 ); 256 asm( 257 ".text\n" 258 "do_syscall_WRK:\n" 259 " push %esi\n" 260 " push %edi\n" 261 " push %ebx\n" 262 " push %ebp\n" 263 " movl 16+ 4(%esp),%eax\n" 264 " movl 16+ 8(%esp),%ebx\n" 265 " movl 16+12(%esp),%ecx\n" 266 " movl 16+16(%esp),%edx\n" 267 " movl 16+20(%esp),%esi\n" 268 " movl 16+24(%esp),%edi\n" 269 " movl 16+28(%esp),%ebp\n" 270 " int $0x80\n" 271 " popl %ebp\n" 272 " popl %ebx\n" 273 " popl %edi\n" 274 " popl %esi\n" 275 " ret\n" 276 ".previous\n" 277 ); 278 279 #elif defined(VGP_amd64_linux) 280 /* Incoming args (syscall number + up to 6 args) come in %rdi, %rsi, 281 %rdx, %rcx, %r8, %r9, and the last one on the stack (ie. the C 282 calling convention). 283 284 The syscall number goes in %rax. The args are passed to the syscall in 285 the regs %rdi, %rsi, %rdx, %r10, %r8, %r9 (yes, really %r10, not %rcx), 286 ie. the kernel's syscall calling convention. 287 288 %rax gets the return value. %rcx and %r11 are clobbered by the syscall; 289 no matter, they are caller-save (the syscall clobbers no callee-save 290 regs, so we don't have to do any register saving/restoring). 291 */ 292 extern UWord do_syscall_WRK ( 293 UWord syscall_no, 294 UWord a1, UWord a2, UWord a3, 295 UWord a4, UWord a5, UWord a6 296 ); 297 asm( 298 ".text\n" 299 "do_syscall_WRK:\n" 300 /* Convert function calling convention --> syscall calling 301 convention */ 302 " movq %rdi, %rax\n" 303 " movq %rsi, %rdi\n" 304 " movq %rdx, %rsi\n" 305 " movq %rcx, %rdx\n" 306 " movq %r8, %r10\n" 307 " movq %r9, %r8\n" 308 " movq 8(%rsp), %r9\n" /* last arg from stack */ 309 " syscall\n" 310 " ret\n" 311 ".previous\n" 312 ); 313 314 #elif defined(VGP_ppc32_linux) 315 /* Incoming args (syscall number + up to 6 args) come in %r3:%r9. 316 317 The syscall number goes in %r0. The args are passed to the syscall in 318 the regs %r3:%r8, i.e. the kernel's syscall calling convention. 319 320 The %cr0.so bit flags an error. 321 We return the syscall return value in %r3, and the %cr0.so in 322 the lowest bit of %r4. 323 We return a ULong, of which %r3 is the high word, and %r4 the low. 324 No callee-save regs are clobbered, so no saving/restoring is needed. 325 */ 326 extern ULong do_syscall_WRK ( 327 UWord syscall_no, 328 UWord a1, UWord a2, UWord a3, 329 UWord a4, UWord a5, UWord a6 330 ); 331 asm( 332 ".text\n" 333 "do_syscall_WRK:\n" 334 " mr 0,3\n" 335 " mr 3,4\n" 336 " mr 4,5\n" 337 " mr 5,6\n" 338 " mr 6,7\n" 339 " mr 7,8\n" 340 " mr 8,9\n" 341 " sc\n" /* syscall: sets %cr0.so on error */ 342 " mfcr 4\n" /* %cr -> low word of return var */ 343 " rlwinm 4,4,4,31,31\n" /* rotate flag bit so to lsb, and mask it */ 344 " blr\n" /* and return */ 345 ".previous\n" 346 ); 347 348 #elif defined(VGP_ppc64_linux) 349 /* Due to the need to return 65 bits of result, this is completely 350 different from the ppc32 case. The single arg register points to a 351 7-word block containing the syscall # and the 6 args. The syscall 352 result proper is put in [0] of the block, and %cr0.so is in the 353 bottom bit of [1]. */ 354 extern void do_syscall_WRK ( ULong* argblock ); 355 asm( 356 ".align 2\n" 357 ".globl do_syscall_WRK\n" 358 ".section \".opd\",\"aw\"\n" 359 ".align 3\n" 360 "do_syscall_WRK:\n" 361 ".quad .do_syscall_WRK,.TOC.@tocbase,0\n" 362 ".previous\n" 363 ".type .do_syscall_WRK,@function\n" 364 ".globl .do_syscall_WRK\n" 365 ".do_syscall_WRK:\n" 366 " std 3,-16(1)\n" /* stash arg */ 367 " ld 8, 48(3)\n" /* sc arg 6 */ 368 " ld 7, 40(3)\n" /* sc arg 5 */ 369 " ld 6, 32(3)\n" /* sc arg 4 */ 370 " ld 5, 24(3)\n" /* sc arg 3 */ 371 " ld 4, 16(3)\n" /* sc arg 2 */ 372 " ld 0, 0(3)\n" /* sc number */ 373 " ld 3, 8(3)\n" /* sc arg 1 */ 374 " sc\n" /* result in r3 and cr0.so */ 375 " ld 5,-16(1)\n" /* reacquire argblock ptr (r5 is caller-save) */ 376 " std 3,0(5)\n" /* argblock[0] = r3 */ 377 " mfcr 3\n" 378 " srwi 3,3,28\n" 379 " andi. 3,3,1\n" 380 " std 3,8(5)\n" /* argblock[1] = cr0.s0 & 1 */ 381 " blr\n" 382 ); 383 384 #elif defined(VGP_arm_linux) 385 /* I think the conventions are: 386 args in r0 r1 r2 r3 r4 r5 387 sysno in r7 388 return value in r0, w/ same conventions as x86-linux, viz r0 in 389 -4096 .. -1 is an error value. All other values are success 390 values. 391 */ 392 extern UWord do_syscall_WRK ( 393 UWord a1, UWord a2, UWord a3, 394 UWord a4, UWord a5, UWord a6, 395 UWord syscall_no 396 ); 397 asm( 398 ".text\n" 399 "do_syscall_WRK:\n" 400 " push {r4, r5, r7}\n" 401 " ldr r4, [sp, #12]\n" 402 " ldr r5, [sp, #16]\n" 403 " ldr r7, [sp, #20]\n" 404 " svc 0x0\n" 405 " pop {r4, r5, r7}\n" 406 " bx lr\n" 407 ".previous\n" 408 ); 409 410 #elif defined(VGP_x86_darwin) 411 412 /* Incoming args (syscall number + up to 8 args) come in on the stack 413 414 The kernel's syscall calling convention is: 415 * the syscall number goes in eax 416 * the args are passed to the syscall on the stack, 417 pushed onto the stack R->L (that is, the usual x86 418 calling conventions, with the leftmost arg at the lowest 419 address) 420 Call instruction: 421 * UNIX: sysenter 422 * UNIX: int $0x80 423 * MACH: int $0x81 424 * MDEP: int $0x82 425 Note that the call type can be determined from the syscall number; 426 there is no need to inspect the actual instruction. Although obviously 427 the instruction must match. 428 Return value: 429 * MACH,MDEP: the return value comes back in eax 430 * UNIX: the return value comes back in edx:eax (hi32:lo32) 431 Error: 432 * MACH,MDEP: no error is returned 433 * UNIX: the carry flag indicates success or failure 434 435 nb here, sizeof(UWord) == sizeof(UInt) 436 */ 437 438 __private_extern__ ULong 439 do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 440 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 441 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 442 UWord syscall_no, /* 36(esp) */ 443 /*OUT*/UInt* errflag /* 40(esp) */ ); 444 // Unix syscall: 64-bit return in edx:eax, with LSB in eax 445 // error indicated by carry flag: clear=good, set=bad 446 asm(".private_extern _do_syscall_unix_WRK\n" 447 "_do_syscall_unix_WRK:\n" 448 " movl 40(%esp), %ecx \n" /* assume syscall success */ 449 " movl $0, (%ecx) \n" 450 " movl 36(%esp), %eax \n" 451 " int $0x80 \n" 452 " jnc 1f \n" /* jump if success */ 453 " movl 40(%esp), %ecx \n" /* syscall failed - set *errflag */ 454 " movl $1, (%ecx) \n" 455 " 1: ret \n" 456 ); 457 458 __private_extern__ UInt 459 do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 460 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 461 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 462 UWord syscall_no /* 36(esp) */ ); 463 // Mach trap: 32-bit result in %eax, no error flag 464 asm(".private_extern _do_syscall_mach_WRK\n" 465 "_do_syscall_mach_WRK:\n" 466 " movl 36(%esp), %eax \n" 467 " int $0x81 \n" 468 " ret \n" 469 ); 470 471 __private_extern__ UInt 472 do_syscall_mdep_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 473 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 474 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 475 UWord syscall_no /* 36(esp) */ ); 476 // mdep trap: 32-bit result in %eax, no error flag 477 asm( 478 ".private_extern _do_syscall_mdep_WRK\n" 479 "_do_syscall_mdep_WRK:\n" 480 " movl 36(%esp), %eax \n" 481 " int $0x82 \n" 482 " ret \n" 483 ); 484 485 486 #elif defined(VGP_amd64_darwin) 487 488 /* Incoming args (syscall number + up to 8 args) come in registers and stack 489 490 The kernel's syscall calling convention is: 491 * the syscall number goes in rax 492 * the args are passed to the syscall in registers and the stack 493 * the call instruction is 'syscall' 494 Return value: 495 * MACH,MDEP: the return value comes back in rax 496 * UNIX: the return value comes back in rdx:rax (hi64:lo64) 497 Error: 498 * MACH,MDEP: no error is returned 499 * UNIX: the carry flag indicates success or failure 500 501 nb here, sizeof(UWord) == sizeof(ULong) 502 */ 503 504 __private_extern__ UWord 505 do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ 506 UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ 507 UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ 508 UWord syscall_no, /* 24(rsp) */ 509 /*OUT*/ULong* errflag, /* 32(rsp) */ 510 /*OUT*/ULong* res2 ); /* 40(rsp) */ 511 // Unix syscall: 128-bit return in rax:rdx, with LSB in rax 512 // error indicated by carry flag: clear=good, set=bad 513 asm(".private_extern _do_syscall_unix_WRK\n" 514 "_do_syscall_unix_WRK:\n" 515 " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ 516 " movq 32(%rsp), %rax \n" /* assume syscall success */ 517 " movq $0, (%rax) \n" 518 " movq 24(%rsp), %rax \n" /* load syscall_no */ 519 " syscall \n" 520 " jnc 1f \n" /* jump if success */ 521 " movq 32(%rsp), %rcx \n" /* syscall failed - set *errflag */ 522 " movq $1, (%rcx) \n" 523 " 1: movq 40(%rsp), %rcx \n" /* save 2nd result word */ 524 " movq %rdx, (%rcx) \n" 525 " retq \n" /* return 1st result word */ 526 ); 527 528 __private_extern__ UWord 529 do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ 530 UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ 531 UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ 532 UWord syscall_no ); /* 24(rsp) */ 533 // Mach trap: 64-bit result, no error flag 534 asm(".private_extern _do_syscall_mach_WRK\n" 535 "_do_syscall_mach_WRK:\n" 536 " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ 537 " movq 24(%rsp), %rax \n" /* load syscall_no */ 538 " syscall \n" 539 " retq \n" 540 ); 541 542 #elif defined(VGP_s390x_linux) 543 544 static UWord do_syscall_WRK ( 545 UWord syscall_no, 546 UWord arg1, UWord arg2, UWord arg3, 547 UWord arg4, UWord arg5, UWord arg6 548 ) 549 { 550 register UWord __arg1 asm("2") = arg1; 551 register UWord __arg2 asm("3") = arg2; 552 register UWord __arg3 asm("4") = arg3; 553 register UWord __arg4 asm("5") = arg4; 554 register UWord __arg5 asm("6") = arg5; 555 register UWord __arg6 asm("7") = arg6; 556 register ULong __svcres asm("2"); 557 558 __asm__ __volatile__ ( 559 "lgr %%r1,%1\n\t" 560 "svc 0\n\t" 561 : "=d" (__svcres) 562 : "a" (syscall_no), 563 "0" (__arg1), 564 "d" (__arg2), 565 "d" (__arg3), 566 "d" (__arg4), 567 "d" (__arg5), 568 "d" (__arg6) 569 : "1", "cc", "memory"); 570 571 return (UWord) (__svcres); 572 } 573 574 #else 575 # error Unknown platform 576 #endif 577 578 579 /* Finally, the generic code. This sends the call to the right 580 helper. */ 581 582 SysRes VG_(do_syscall) ( UWord sysno, UWord a1, UWord a2, UWord a3, 583 UWord a4, UWord a5, UWord a6, 584 UWord a7, UWord a8 ) 585 { 586 # if defined(VGP_x86_linux) 587 UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 588 return VG_(mk_SysRes_x86_linux)( val ); 589 590 # elif defined(VGP_amd64_linux) 591 UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 592 return VG_(mk_SysRes_amd64_linux)( val ); 593 594 # elif defined(VGP_ppc32_linux) 595 ULong ret = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 596 UInt val = (UInt)(ret>>32); 597 UInt cr0so = (UInt)(ret); 598 return VG_(mk_SysRes_ppc32_linux)( val, cr0so ); 599 600 # elif defined(VGP_ppc64_linux) 601 ULong argblock[7]; 602 argblock[0] = sysno; 603 argblock[1] = a1; 604 argblock[2] = a2; 605 argblock[3] = a3; 606 argblock[4] = a4; 607 argblock[5] = a5; 608 argblock[6] = a6; 609 do_syscall_WRK( &argblock[0] ); 610 return VG_(mk_SysRes_ppc64_linux)( argblock[0], argblock[1] ); 611 612 # elif defined(VGP_arm_linux) 613 UWord val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno); 614 return VG_(mk_SysRes_arm_linux)( val ); 615 616 # elif defined(VGP_x86_darwin) 617 UInt wLO = 0, wHI = 0, err = 0; 618 ULong u64; 619 UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); 620 switch (scclass) { 621 case VG_DARWIN_SYSCALL_CLASS_UNIX: 622 u64 = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 623 VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err); 624 wLO = (UInt)u64; 625 wHI = (UInt)(u64 >> 32); 626 break; 627 case VG_DARWIN_SYSCALL_CLASS_MACH: 628 wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 629 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 630 err = 0; 631 break; 632 case VG_DARWIN_SYSCALL_CLASS_MDEP: 633 wLO = do_syscall_mdep_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 634 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 635 err = 0; 636 break; 637 default: 638 vg_assert(0); 639 break; 640 } 641 return VG_(mk_SysRes_x86_darwin)( scclass, err ? True : False, wHI, wLO ); 642 643 # elif defined(VGP_amd64_darwin) 644 ULong wLO = 0, wHI = 0, err = 0; 645 UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); 646 switch (scclass) { 647 case VG_DARWIN_SYSCALL_CLASS_UNIX: 648 wLO = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 649 VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err, &wHI); 650 break; 651 case VG_DARWIN_SYSCALL_CLASS_MACH: 652 case VG_DARWIN_SYSCALL_CLASS_MDEP: 653 wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 654 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 655 err = 0; 656 break; 657 default: 658 vg_assert(0); 659 break; 660 } 661 return VG_(mk_SysRes_amd64_darwin)( scclass, err ? True : False, wHI, wLO ); 662 663 #elif defined(VGP_s390x_linux) 664 UWord val; 665 666 if (sysno == __NR_mmap) { 667 ULong argbuf[6]; 668 669 argbuf[0] = a1; 670 argbuf[1] = a2; 671 argbuf[2] = a3; 672 argbuf[3] = a4; 673 argbuf[4] = a5; 674 argbuf[5] = a6; 675 val = do_syscall_WRK(sysno,(UWord)&argbuf[0],0,0,0,0,0); 676 } else { 677 val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 678 } 679 680 return VG_(mk_SysRes_s390x_linux)( val ); 681 #else 682 # error Unknown platform 683 #endif 684 } 685 686 /* --------------------------------------------------------------------- 687 Names of errors. 688 ------------------------------------------------------------------ */ 689 690 /* Return a string which gives the name of an error value. Note, 691 unlike the standard C syserror fn, the returned string is not 692 malloc-allocated or writable -- treat it as a constant. 693 TODO: implement this properly. */ 694 695 const HChar* VG_(strerror) ( UWord errnum ) 696 { 697 switch (errnum) { 698 case VKI_EPERM: return "Operation not permitted"; 699 case VKI_ENOENT: return "No such file or directory"; 700 case VKI_ESRCH: return "No such process"; 701 case VKI_EINTR: return "Interrupted system call"; 702 case VKI_EBADF: return "Bad file number"; 703 case VKI_EAGAIN: return "Try again"; 704 case VKI_ENOMEM: return "Out of memory"; 705 case VKI_EACCES: return "Permission denied"; 706 case VKI_EFAULT: return "Bad address"; 707 case VKI_EEXIST: return "File exists"; 708 case VKI_EINVAL: return "Invalid argument"; 709 case VKI_EMFILE: return "Too many open files"; 710 case VKI_ENOSYS: return "Function not implemented"; 711 case VKI_EOVERFLOW: return "Value too large for defined data type"; 712 # if defined(VKI_ERESTARTSYS) 713 case VKI_ERESTARTSYS: return "ERESTARTSYS"; 714 # endif 715 default: return "VG_(strerror): unknown error"; 716 } 717 } 718 719 720 /*--------------------------------------------------------------------*/ 721 /*--- end ---*/ 722 /*--------------------------------------------------------------------*/ 723
