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) 2000-2013 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 SysRes VG_(mk_SysRes_arm64_linux) ( Long val ) { 132 SysRes res; 133 res._valEx = 0; /* unused except on mips-linux */ 134 res._isError = val >= -4095 && val <= -1; 135 if (res._isError) { 136 res._val = (ULong)(-val); 137 } else { 138 res._val = (ULong)val; 139 } 140 return res; 141 } 142 143 /* MIPS uses a3 != 0 to flag an error */ 144 SysRes VG_(mk_SysRes_mips32_linux) ( UWord v0, UWord v1, UWord a3 ) { 145 SysRes res; 146 res._isError = (a3 != (UWord)0); 147 res._val = v0; 148 res._valEx = v1; 149 return res; 150 } 151 152 /* MIPS uses a3 != 0 to flag an error */ 153 SysRes VG_(mk_SysRes_mips64_linux) ( ULong v0, ULong v1, ULong a3 ) { 154 SysRes res; 155 res._isError = (a3 != (ULong)0); 156 res._val = v0; 157 res._valEx = v1; 158 return res; 159 } 160 161 /* Generic constructors. */ 162 SysRes VG_(mk_SysRes_Error) ( UWord err ) { 163 SysRes r; 164 r._valEx = 0; /* unused except on mips-linux */ 165 r._isError = True; 166 r._val = err; 167 return r; 168 } 169 170 SysRes VG_(mk_SysRes_Success) ( UWord res ) { 171 SysRes r; 172 r._valEx = 0; /* unused except on mips-linux */ 173 r._isError = False; 174 r._val = res; 175 return r; 176 } 177 178 179 #elif defined(VGO_darwin) 180 181 /* Darwin: Some syscalls return a double-word result. */ 182 SysRes VG_(mk_SysRes_x86_darwin) ( UChar scclass, Bool isErr, 183 UInt wHI, UInt wLO ) 184 { 185 SysRes res; 186 res._wHI = 0; 187 res._wLO = 0; 188 res._mode = 0; /* invalid */ 189 vg_assert(isErr == False || isErr == True); 190 vg_assert(sizeof(UWord) == sizeof(UInt)); 191 switch (scclass) { 192 case VG_DARWIN_SYSCALL_CLASS_UNIX: 193 res._wLO = wLO; 194 res._wHI = wHI; 195 res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; 196 break; 197 case VG_DARWIN_SYSCALL_CLASS_MACH: 198 vg_assert(!isErr); 199 vg_assert(wHI == 0); 200 res._wLO = wLO; 201 res._mode = SysRes_MACH; 202 break; 203 case VG_DARWIN_SYSCALL_CLASS_MDEP: 204 vg_assert(!isErr); 205 vg_assert(wHI == 0); 206 res._wLO = wLO; 207 res._mode = SysRes_MDEP; 208 break; 209 default: 210 vg_assert(0); 211 } 212 return res; 213 } 214 215 SysRes VG_(mk_SysRes_amd64_darwin) ( UChar scclass, Bool isErr, 216 ULong wHI, ULong wLO ) 217 { 218 SysRes res; 219 res._wHI = 0; 220 res._wLO = 0; 221 res._mode = 0; /* invalid */ 222 vg_assert(isErr == False || isErr == True); 223 vg_assert(sizeof(UWord) == sizeof(ULong)); 224 switch (scclass) { 225 case VG_DARWIN_SYSCALL_CLASS_UNIX: 226 res._wLO = wLO; 227 res._wHI = wHI; 228 res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; 229 break; 230 case VG_DARWIN_SYSCALL_CLASS_MACH: 231 vg_assert(!isErr); 232 vg_assert(wHI == 0); 233 res._wLO = wLO; 234 res._mode = SysRes_MACH; 235 break; 236 case VG_DARWIN_SYSCALL_CLASS_MDEP: 237 vg_assert(!isErr); 238 vg_assert(wHI == 0); 239 res._wLO = wLO; 240 res._mode = SysRes_MDEP; 241 break; 242 default: 243 vg_assert(0); 244 } 245 return res; 246 } 247 248 /* Generic constructors. We assume (without checking if this makes 249 any sense, from the caller's point of view) that these are for the 250 UNIX style of syscall. */ 251 SysRes VG_(mk_SysRes_Error) ( UWord err ) { 252 SysRes r; 253 r._wHI = 0; 254 r._wLO = err; 255 r._mode = SysRes_UNIX_ERR; 256 return r; 257 } 258 259 SysRes VG_(mk_SysRes_Success) ( UWord res ) { 260 SysRes r; 261 r._wHI = 0; 262 r._wLO = res; 263 r._mode = SysRes_UNIX_OK; 264 return r; 265 } 266 267 268 #else 269 # error "Unknown OS" 270 #endif 271 272 273 /* --------------------------------------------------------------------- 274 VG_(do_syscall): A function for doing syscalls. 275 ------------------------------------------------------------------ */ 276 277 #if defined(VGP_x86_linux) 278 /* Incoming args (syscall number + up to 6 args) come on the stack. 279 (ie. the C calling convention). 280 281 The syscall number goes in %eax. The args are passed to the syscall in 282 the regs %ebx, %ecx, %edx, %esi, %edi, %ebp, ie. the kernel's syscall 283 calling convention. 284 285 %eax gets the return value. Not sure which registers the kernel 286 clobbers, so we preserve all the callee-save regs (%esi, %edi, %ebx, 287 %ebp). 288 */ 289 extern UWord do_syscall_WRK ( 290 UWord syscall_no, 291 UWord a1, UWord a2, UWord a3, 292 UWord a4, UWord a5, UWord a6 293 ); 294 asm( 295 ".text\n" 296 ".globl do_syscall_WRK\n" 297 "do_syscall_WRK:\n" 298 " push %esi\n" 299 " push %edi\n" 300 " push %ebx\n" 301 " push %ebp\n" 302 " movl 16+ 4(%esp),%eax\n" 303 " movl 16+ 8(%esp),%ebx\n" 304 " movl 16+12(%esp),%ecx\n" 305 " movl 16+16(%esp),%edx\n" 306 " movl 16+20(%esp),%esi\n" 307 " movl 16+24(%esp),%edi\n" 308 " movl 16+28(%esp),%ebp\n" 309 " int $0x80\n" 310 " popl %ebp\n" 311 " popl %ebx\n" 312 " popl %edi\n" 313 " popl %esi\n" 314 " ret\n" 315 ".previous\n" 316 ); 317 318 #elif defined(VGP_amd64_linux) 319 /* Incoming args (syscall number + up to 6 args) come in %rdi, %rsi, 320 %rdx, %rcx, %r8, %r9, and the last one on the stack (ie. the C 321 calling convention). 322 323 The syscall number goes in %rax. The args are passed to the syscall in 324 the regs %rdi, %rsi, %rdx, %r10, %r8, %r9 (yes, really %r10, not %rcx), 325 ie. the kernel's syscall calling convention. 326 327 %rax gets the return value. %rcx and %r11 are clobbered by the syscall; 328 no matter, they are caller-save (the syscall clobbers no callee-save 329 regs, so we don't have to do any register saving/restoring). 330 */ 331 extern UWord do_syscall_WRK ( 332 UWord syscall_no, 333 UWord a1, UWord a2, UWord a3, 334 UWord a4, UWord a5, UWord a6 335 ); 336 asm( 337 ".text\n" 338 ".globl do_syscall_WRK\n" 339 "do_syscall_WRK:\n" 340 /* Convert function calling convention --> syscall calling 341 convention */ 342 " movq %rdi, %rax\n" 343 " movq %rsi, %rdi\n" 344 " movq %rdx, %rsi\n" 345 " movq %rcx, %rdx\n" 346 " movq %r8, %r10\n" 347 " movq %r9, %r8\n" 348 " movq 8(%rsp), %r9\n" /* last arg from stack */ 349 " syscall\n" 350 " ret\n" 351 ".previous\n" 352 ); 353 354 #elif defined(VGP_ppc32_linux) 355 /* Incoming args (syscall number + up to 6 args) come in %r3:%r9. 356 357 The syscall number goes in %r0. The args are passed to the syscall in 358 the regs %r3:%r8, i.e. the kernel's syscall calling convention. 359 360 The %cr0.so bit flags an error. 361 We return the syscall return value in %r3, and the %cr0.so in 362 the lowest bit of %r4. 363 We return a ULong, of which %r3 is the high word, and %r4 the low. 364 No callee-save regs are clobbered, so no saving/restoring is needed. 365 */ 366 extern ULong do_syscall_WRK ( 367 UWord syscall_no, 368 UWord a1, UWord a2, UWord a3, 369 UWord a4, UWord a5, UWord a6 370 ); 371 asm( 372 ".text\n" 373 ".globl do_syscall_WRK\n" 374 "do_syscall_WRK:\n" 375 " mr 0,3\n" 376 " mr 3,4\n" 377 " mr 4,5\n" 378 " mr 5,6\n" 379 " mr 6,7\n" 380 " mr 7,8\n" 381 " mr 8,9\n" 382 " sc\n" /* syscall: sets %cr0.so on error */ 383 " mfcr 4\n" /* %cr -> low word of return var */ 384 " rlwinm 4,4,4,31,31\n" /* rotate flag bit so to lsb, and mask it */ 385 " blr\n" /* and return */ 386 ".previous\n" 387 ); 388 389 #elif defined(VGP_ppc64_linux) 390 /* Due to the need to return 65 bits of result, this is completely 391 different from the ppc32 case. The single arg register points to a 392 7-word block containing the syscall # and the 6 args. The syscall 393 result proper is put in [0] of the block, and %cr0.so is in the 394 bottom bit of [1]. */ 395 extern void do_syscall_WRK ( ULong* argblock ); 396 asm( 397 ".align 2\n" 398 ".globl do_syscall_WRK\n" 399 ".section \".opd\",\"aw\"\n" 400 ".align 3\n" 401 "do_syscall_WRK:\n" 402 ".quad .do_syscall_WRK,.TOC.@tocbase,0\n" 403 ".previous\n" 404 ".type .do_syscall_WRK,@function\n" 405 ".globl .do_syscall_WRK\n" 406 ".do_syscall_WRK:\n" 407 " std 3,-16(1)\n" /* stash arg */ 408 " ld 8, 48(3)\n" /* sc arg 6 */ 409 " ld 7, 40(3)\n" /* sc arg 5 */ 410 " ld 6, 32(3)\n" /* sc arg 4 */ 411 " ld 5, 24(3)\n" /* sc arg 3 */ 412 " ld 4, 16(3)\n" /* sc arg 2 */ 413 " ld 0, 0(3)\n" /* sc number */ 414 " ld 3, 8(3)\n" /* sc arg 1 */ 415 " sc\n" /* result in r3 and cr0.so */ 416 " ld 5,-16(1)\n" /* reacquire argblock ptr (r5 is caller-save) */ 417 " std 3,0(5)\n" /* argblock[0] = r3 */ 418 " mfcr 3\n" 419 " srwi 3,3,28\n" 420 " andi. 3,3,1\n" 421 " std 3,8(5)\n" /* argblock[1] = cr0.s0 & 1 */ 422 " blr\n" 423 ); 424 425 #elif defined(VGP_arm_linux) 426 /* I think the conventions are: 427 args in r0 r1 r2 r3 r4 r5 428 sysno in r7 429 return value in r0, w/ same conventions as x86-linux, viz r0 in 430 -4096 .. -1 is an error value. All other values are success 431 values. 432 */ 433 extern UWord do_syscall_WRK ( 434 UWord a1, UWord a2, UWord a3, 435 UWord a4, UWord a5, UWord a6, 436 UWord syscall_no 437 ); 438 asm( 439 ".text\n" 440 ".globl do_syscall_WRK\n" 441 "do_syscall_WRK:\n" 442 " push {r4, r5, r7}\n" 443 " ldr r4, [sp, #12]\n" 444 " ldr r5, [sp, #16]\n" 445 " ldr r7, [sp, #20]\n" 446 " svc 0x0\n" 447 " pop {r4, r5, r7}\n" 448 " bx lr\n" 449 ".previous\n" 450 ); 451 452 #elif defined(VGP_arm64_linux) 453 /* I think the conventions are: 454 args in r0 r1 r2 r3 r4 r5 455 sysno in r8 456 return value in r0, w/ same conventions as x86-linux, viz r0 in 457 -4096 .. -1 is an error value. All other values are success 458 values. 459 460 r0 to r5 remain unchanged, but syscall_no is in r6 and needs 461 to be moved to r8 (??) 462 */ 463 extern UWord do_syscall_WRK ( 464 UWord a1, UWord a2, UWord a3, 465 UWord a4, UWord a5, UWord a6, 466 UWord syscall_no 467 ); 468 asm( 469 ".text\n" 470 ".globl do_syscall_WRK\n" 471 "do_syscall_WRK:\n" 472 " mov x8, x6\n" 473 " mov x6, 0\n" 474 " mov x7, 0\n" 475 " svc 0\n" 476 " ret\n" 477 ".previous\n" 478 ); 479 480 #elif defined(VGP_x86_darwin) 481 482 /* Incoming args (syscall number + up to 8 args) come in on the stack 483 484 The kernel's syscall calling convention is: 485 * the syscall number goes in eax 486 * the args are passed to the syscall on the stack, 487 pushed onto the stack R->L (that is, the usual x86 488 calling conventions, with the leftmost arg at the lowest 489 address) 490 Call instruction: 491 * UNIX: sysenter 492 * UNIX: int $0x80 493 * MACH: int $0x81 494 * MDEP: int $0x82 495 Note that the call type can be determined from the syscall number; 496 there is no need to inspect the actual instruction. Although obviously 497 the instruction must match. 498 Return value: 499 * MACH,MDEP: the return value comes back in eax 500 * UNIX: the return value comes back in edx:eax (hi32:lo32) 501 Error: 502 * MACH,MDEP: no error is returned 503 * UNIX: the carry flag indicates success or failure 504 505 nb here, sizeof(UWord) == sizeof(UInt) 506 */ 507 508 __private_extern__ ULong 509 do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 510 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 511 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 512 UWord syscall_no, /* 36(esp) */ 513 /*OUT*/UInt* errflag /* 40(esp) */ ); 514 // Unix syscall: 64-bit return in edx:eax, with LSB in eax 515 // error indicated by carry flag: clear=good, set=bad 516 asm(".private_extern _do_syscall_unix_WRK\n" 517 "_do_syscall_unix_WRK:\n" 518 " movl 40(%esp), %ecx \n" /* assume syscall success */ 519 " movl $0, (%ecx) \n" 520 " movl 36(%esp), %eax \n" 521 " int $0x80 \n" 522 " jnc 1f \n" /* jump if success */ 523 " movl 40(%esp), %ecx \n" /* syscall failed - set *errflag */ 524 " movl $1, (%ecx) \n" 525 " 1: ret \n" 526 ); 527 528 __private_extern__ UInt 529 do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 530 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 531 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 532 UWord syscall_no /* 36(esp) */ ); 533 // Mach trap: 32-bit result in %eax, no error flag 534 asm(".private_extern _do_syscall_mach_WRK\n" 535 "_do_syscall_mach_WRK:\n" 536 " movl 36(%esp), %eax \n" 537 " int $0x81 \n" 538 " ret \n" 539 ); 540 541 __private_extern__ UInt 542 do_syscall_mdep_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ 543 UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ 544 UWord a7, UWord a8, /* 28(esp)..32(esp) */ 545 UWord syscall_no /* 36(esp) */ ); 546 // mdep trap: 32-bit result in %eax, no error flag 547 asm( 548 ".private_extern _do_syscall_mdep_WRK\n" 549 "_do_syscall_mdep_WRK:\n" 550 " movl 36(%esp), %eax \n" 551 " int $0x82 \n" 552 " ret \n" 553 ); 554 555 556 #elif defined(VGP_amd64_darwin) 557 558 /* Incoming args (syscall number + up to 8 args) come in registers and stack 559 560 The kernel's syscall calling convention is: 561 * the syscall number goes in rax 562 * the args are passed to the syscall in registers and the stack 563 * the call instruction is 'syscall' 564 Return value: 565 * MACH,MDEP: the return value comes back in rax 566 * UNIX: the return value comes back in rdx:rax (hi64:lo64) 567 Error: 568 * MACH,MDEP: no error is returned 569 * UNIX: the carry flag indicates success or failure 570 571 nb here, sizeof(UWord) == sizeof(ULong) 572 */ 573 574 __private_extern__ UWord 575 do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ 576 UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ 577 UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ 578 UWord syscall_no, /* 24(rsp) */ 579 /*OUT*/ULong* errflag, /* 32(rsp) */ 580 /*OUT*/ULong* res2 ); /* 40(rsp) */ 581 // Unix syscall: 128-bit return in rax:rdx, with LSB in rax 582 // error indicated by carry flag: clear=good, set=bad 583 asm(".private_extern _do_syscall_unix_WRK\n" 584 "_do_syscall_unix_WRK:\n" 585 " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ 586 " movq 32(%rsp), %rax \n" /* assume syscall success */ 587 " movq $0, (%rax) \n" 588 " movq 24(%rsp), %rax \n" /* load syscall_no */ 589 " syscall \n" 590 " jnc 1f \n" /* jump if success */ 591 " movq 32(%rsp), %rcx \n" /* syscall failed - set *errflag */ 592 " movq $1, (%rcx) \n" 593 " 1: movq 40(%rsp), %rcx \n" /* save 2nd result word */ 594 " movq %rdx, (%rcx) \n" 595 " retq \n" /* return 1st result word */ 596 ); 597 598 __private_extern__ UWord 599 do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ 600 UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ 601 UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ 602 UWord syscall_no ); /* 24(rsp) */ 603 // Mach trap: 64-bit result, no error flag 604 asm(".private_extern _do_syscall_mach_WRK\n" 605 "_do_syscall_mach_WRK:\n" 606 " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ 607 " movq 24(%rsp), %rax \n" /* load syscall_no */ 608 " syscall \n" 609 " retq \n" 610 ); 611 612 #elif defined(VGP_s390x_linux) 613 614 static UWord do_syscall_WRK ( 615 UWord syscall_no, 616 UWord arg1, UWord arg2, UWord arg3, 617 UWord arg4, UWord arg5, UWord arg6 618 ) 619 { 620 register UWord __arg1 asm("2") = arg1; 621 register UWord __arg2 asm("3") = arg2; 622 register UWord __arg3 asm("4") = arg3; 623 register UWord __arg4 asm("5") = arg4; 624 register UWord __arg5 asm("6") = arg5; 625 register UWord __arg6 asm("7") = arg6; 626 register ULong __svcres asm("2"); 627 628 __asm__ __volatile__ ( 629 "lgr %%r1,%1\n\t" 630 "svc 0\n\t" 631 : "=d" (__svcres) 632 : "a" (syscall_no), 633 "0" (__arg1), 634 "d" (__arg2), 635 "d" (__arg3), 636 "d" (__arg4), 637 "d" (__arg5), 638 "d" (__arg6) 639 : "1", "cc", "memory"); 640 641 return (UWord) (__svcres); 642 } 643 644 #elif defined(VGP_mips32_linux) 645 /* Incoming args (syscall number + up to 6 args) come in a0 - a3 and stack. 646 647 The syscall number goes in v0. The args are passed to the syscall in 648 the regs a0 - a3 and stack, i.e. the kernel's syscall calling convention. 649 650 (a3 != 0) flags an error. 651 We return the syscall return value in v0. 652 MIPS version 653 */ 654 extern int do_syscall_WRK ( 655 int a1, int a2, int a3, 656 int a4, int a5, int a6, int syscall_no, UWord *err, 657 UWord *valHi, UWord* valLo 658 ); 659 asm( 660 ".globl do_syscall_WRK\n" 661 ".ent do_syscall_WRK\n" 662 ".text\n" 663 "do_syscall_WRK:\n" 664 " lw $2, 24($29)\n" 665 " syscall\n" 666 " lw $8, 28($29)\n" 667 " sw $7, ($8)\n" 668 " lw $8, 32($29)\n" 669 " sw $3, ($8)\n" // store valHi 670 " lw $8, 36($29)\n" 671 " sw $2, ($8)\n" // store valLo 672 " jr $31\n" 673 " nop\n" 674 ".previous\n" 675 ".end do_syscall_WRK\n" 676 ); 677 678 #elif defined(VGP_mips64_linux) 679 extern UWord do_syscall_WRK ( UWord a1, UWord a2, UWord a3, UWord a4, UWord a5, 680 UWord a6, UWord syscall_no, ULong* V1_val ); 681 asm ( 682 ".text\n" 683 ".globl do_syscall_WRK\n" 684 "do_syscall_WRK:\n" 685 " daddiu $29, $29, -8\n" 686 " sd $11, 0($29)\n" 687 " move $2, $10\n" 688 " syscall\n" 689 " ld $11, 0($29)\n" 690 " daddiu $29, $29, 8\n" 691 " sd $3, 0($11)\n" /* store vale of v1 in last param */ 692 " sd $7, 8($11)\n" /* store vale of a3 in last param */ 693 " jr $31\n" 694 ".previous\n" 695 ); 696 697 #else 698 # error Unknown platform 699 #endif 700 701 702 /* Finally, the generic code. This sends the call to the right 703 helper. */ 704 705 SysRes VG_(do_syscall) ( UWord sysno, UWord a1, UWord a2, UWord a3, 706 UWord a4, UWord a5, UWord a6, 707 UWord a7, UWord a8 ) 708 { 709 # if defined(VGP_x86_linux) 710 UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 711 return VG_(mk_SysRes_x86_linux)( val ); 712 713 # elif defined(VGP_amd64_linux) 714 UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 715 return VG_(mk_SysRes_amd64_linux)( val ); 716 717 # elif defined(VGP_ppc32_linux) 718 ULong ret = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 719 UInt val = (UInt)(ret>>32); 720 UInt cr0so = (UInt)(ret); 721 return VG_(mk_SysRes_ppc32_linux)( val, cr0so ); 722 723 # elif defined(VGP_ppc64_linux) 724 ULong argblock[7]; 725 argblock[0] = sysno; 726 argblock[1] = a1; 727 argblock[2] = a2; 728 argblock[3] = a3; 729 argblock[4] = a4; 730 argblock[5] = a5; 731 argblock[6] = a6; 732 do_syscall_WRK( &argblock[0] ); 733 return VG_(mk_SysRes_ppc64_linux)( argblock[0], argblock[1] ); 734 735 # elif defined(VGP_arm_linux) 736 UWord val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno); 737 return VG_(mk_SysRes_arm_linux)( val ); 738 739 # elif defined(VGP_arm64_linux) 740 UWord val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno); 741 return VG_(mk_SysRes_arm64_linux)( val ); 742 743 # elif defined(VGP_x86_darwin) 744 UInt wLO = 0, wHI = 0, err = 0; 745 ULong u64; 746 UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); 747 switch (scclass) { 748 case VG_DARWIN_SYSCALL_CLASS_UNIX: 749 u64 = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 750 VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err); 751 wLO = (UInt)u64; 752 wHI = (UInt)(u64 >> 32); 753 break; 754 case VG_DARWIN_SYSCALL_CLASS_MACH: 755 wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 756 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 757 err = 0; 758 break; 759 case VG_DARWIN_SYSCALL_CLASS_MDEP: 760 wLO = do_syscall_mdep_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 761 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 762 err = 0; 763 break; 764 default: 765 vg_assert(0); 766 break; 767 } 768 return VG_(mk_SysRes_x86_darwin)( scclass, err ? True : False, wHI, wLO ); 769 770 # elif defined(VGP_amd64_darwin) 771 ULong wLO = 0, wHI = 0, err = 0; 772 UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); 773 switch (scclass) { 774 case VG_DARWIN_SYSCALL_CLASS_UNIX: 775 wLO = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 776 VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err, &wHI); 777 break; 778 case VG_DARWIN_SYSCALL_CLASS_MACH: 779 case VG_DARWIN_SYSCALL_CLASS_MDEP: 780 wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, 781 VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); 782 err = 0; 783 break; 784 default: 785 vg_assert(0); 786 break; 787 } 788 return VG_(mk_SysRes_amd64_darwin)( scclass, err ? True : False, wHI, wLO ); 789 790 #elif defined(VGP_s390x_linux) 791 UWord val; 792 793 if (sysno == __NR_mmap) { 794 ULong argbuf[6]; 795 796 argbuf[0] = a1; 797 argbuf[1] = a2; 798 argbuf[2] = a3; 799 argbuf[3] = a4; 800 argbuf[4] = a5; 801 argbuf[5] = a6; 802 val = do_syscall_WRK(sysno,(UWord)&argbuf[0],0,0,0,0,0); 803 } else { 804 val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); 805 } 806 807 return VG_(mk_SysRes_s390x_linux)( val ); 808 809 #elif defined(VGP_mips32_linux) 810 UWord err = 0; 811 UWord valHi = 0; 812 UWord valLo = 0; 813 (void) do_syscall_WRK(a1,a2,a3,a4,a5,a6, sysno,&err,&valHi,&valLo); 814 return VG_(mk_SysRes_mips32_linux)( valLo, valHi, (ULong)err ); 815 816 #elif defined(VGP_mips64_linux) 817 ULong v1_a3[2]; 818 v1_a3[0] = 0xFF00; 819 v1_a3[1] = 0xFF00; 820 ULong V0 = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno,v1_a3); 821 ULong V1 = (ULong)v1_a3[0]; 822 ULong A3 = (ULong)v1_a3[1]; 823 return VG_(mk_SysRes_mips64_linux)( V0, V1, A3 ); 824 825 #else 826 # error Unknown platform 827 #endif 828 } 829 830 /* --------------------------------------------------------------------- 831 Names of errors. 832 ------------------------------------------------------------------ */ 833 834 /* Return a string which gives the name of an error value. Note, 835 unlike the standard C syserror fn, the returned string is not 836 malloc-allocated or writable -- treat it as a constant. 837 TODO: implement this properly. */ 838 839 const HChar* VG_(strerror) ( UWord errnum ) 840 { 841 switch (errnum) { 842 case VKI_EPERM: return "Operation not permitted"; 843 case VKI_ENOENT: return "No such file or directory"; 844 case VKI_ESRCH: return "No such process"; 845 case VKI_EINTR: return "Interrupted system call"; 846 case VKI_EIO: return "Input/output error"; 847 case VKI_ENXIO: return "No such device or address"; 848 case VKI_E2BIG: return "Argument list too long"; 849 case VKI_ENOEXEC: return "Exec format error"; 850 case VKI_EBADF: return "Bad file descriptor"; 851 case VKI_ECHILD: return "No child processes"; 852 case VKI_EAGAIN: return "Resource temporarily unavailable"; 853 case VKI_ENOMEM: return "Cannot allocate memory"; 854 case VKI_EACCES: return "Permission denied"; 855 case VKI_EFAULT: return "Bad address"; 856 case VKI_ENOTBLK: return "Block device required"; 857 case VKI_EBUSY: return "Device or resource busy"; 858 case VKI_EEXIST: return "File exists"; 859 case VKI_EXDEV: return "Invalid cross-device link"; 860 case VKI_ENODEV: return "No such device"; 861 case VKI_ENOTDIR: return "Not a directory"; 862 case VKI_EISDIR: return "Is a directory"; 863 case VKI_EINVAL: return "Invalid argument"; 864 case VKI_ENFILE: return "Too many open files in system"; 865 case VKI_EMFILE: return "Too many open files"; 866 case VKI_ENOTTY: return "Inappropriate ioctl for device"; 867 case VKI_ETXTBSY: return "Text file busy"; 868 case VKI_EFBIG: return "File too large"; 869 case VKI_ENOSPC: return "No space left on device"; 870 case VKI_ESPIPE: return "Illegal seek"; 871 case VKI_EROFS: return "Read-only file system"; 872 case VKI_EMLINK: return "Too many links"; 873 case VKI_EPIPE: return "Broken pipe"; 874 case VKI_EDOM: return "Numerical argument out of domain"; 875 case VKI_ERANGE: return "Numerical result out of range"; 876 877 case VKI_ENOSYS: return "Function not implemented"; 878 case VKI_EOVERFLOW: return "Value too large for defined data type"; 879 # if defined(VKI_ERESTARTSYS) 880 case VKI_ERESTARTSYS: return "ERESTARTSYS"; 881 # endif 882 default: return "VG_(strerror): unknown error"; 883 } 884 } 885 886 887 /*--------------------------------------------------------------------*/ 888 /*--- end ---*/ 889 /*--------------------------------------------------------------------*/ 890
