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@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._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 .. */
VG_(mk_SysRes_amd64_linux)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 */
VG_(mk_SysRes_ppc32_linux)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 */
VG_(mk_SysRes_ppc64_linux)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
VG_(mk_SysRes_s390x_linux)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
VG_(mk_SysRes_arm_linux)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 */
VG_(mk_SysRes_mips32_linux)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. */
VG_(mk_SysRes_Error)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
VG_(mk_SysRes_Success)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. */
VG_(mk_SysRes_x86_darwin)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
VG_(mk_SysRes_amd64_darwin)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. */
VG_(mk_SysRes_Error)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
VG_(mk_SysRes_Success)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
do_syscall_WRK(UWord syscall_no,UWord arg1,UWord arg2,UWord arg3,UWord arg4,UWord arg5,UWord arg6)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
VG_(do_syscall)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
VG_(strerror)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