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@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
VG_(mk_SysRes_x86_linux)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 .. */
VG_(mk_SysRes_amd64_linux)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 */
VG_(mk_SysRes_ppc32_linux)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 */
VG_(mk_SysRes_ppc64_linux)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
VG_(mk_SysRes_s390x_linux)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
VG_(mk_SysRes_arm_linux)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. */
VG_(mk_SysRes_Error)126 SysRes VG_(mk_SysRes_Error) ( UWord err ) {
127 SysRes r;
128 r._isError = True;
129 r._val = err;
130 return r;
131 }
132
VG_(mk_SysRes_Success)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. */
VG_(mk_SysRes_x86_darwin)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
VG_(mk_SysRes_amd64_darwin)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. */
VG_(mk_SysRes_Error)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
VG_(mk_SysRes_Success)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
do_syscall_WRK(UWord syscall_no,UWord arg1,UWord arg2,UWord arg3,UWord arg4,UWord arg5,UWord arg6)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
VG_(do_syscall)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
VG_(strerror)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