| |
| /*--------------------------------------------------------------------*/ |
| /*--- Doing syscalls. m_syscall.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2010 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_core_basics.h" |
| #include "pub_core_libcassert.h" |
| #include "pub_core_vki.h" |
| #include "pub_core_vkiscnums.h" |
| #include "pub_core_syscall.h" |
| |
| /* --------------------------------------------------------------------- |
| Building syscall return values. |
| ------------------------------------------------------------------ */ |
| |
| #if defined(VGO_linux) |
| |
| /* Make a SysRes value from a syscall return value. This is |
| Linux-specific. |
| |
| From: |
| http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/unix/sysv/ |
| linux/i386/sysdep.h? |
| rev=1.28&content-type=text/x-cvsweb-markup&cvsroot=glibc |
| |
| Linux uses a negative return value to indicate syscall errors, |
| unlike most Unices, which use the condition codes' carry flag. |
| |
| Since version 2.1 the return value of a system call might be |
| negative even if the call succeeded. E.g., the 'lseek' system call |
| might return a large offset. Therefore we must not anymore test |
| for < 0, but test for a real error by making sure the value in %eax |
| is a real error number. Linus said he will make sure the no |
| syscall returns a value in -1 .. -4095 as a valid result so we can |
| safely test with -4095. |
| */ |
| |
| SysRes VG_(mk_SysRes_x86_linux) ( Int val ) { |
| SysRes res; |
| res._isError = val >= -4095 && val <= -1; |
| if (res._isError) { |
| res._val = (UInt)(-val); |
| } else { |
| res._val = (UInt)val; |
| } |
| return res; |
| } |
| |
| /* Similarly .. */ |
| SysRes VG_(mk_SysRes_amd64_linux) ( Long val ) { |
| SysRes res; |
| res._isError = val >= -4095 && val <= -1; |
| if (res._isError) { |
| res._val = (ULong)(-val); |
| } else { |
| res._val = (ULong)val; |
| } |
| return res; |
| } |
| |
| /* PPC uses the CR7.SO bit to flag an error (CR0 in IBM-speak) */ |
| /* Note this must be in the bottom bit of the second arg */ |
| SysRes VG_(mk_SysRes_ppc32_linux) ( UInt val, UInt cr0so ) { |
| SysRes res; |
| res._isError = (cr0so & 1) != 0; |
| res._val = val; |
| return res; |
| } |
| |
| /* As per ppc32 version, cr0.so must be in l.s.b. of 2nd arg */ |
| SysRes VG_(mk_SysRes_ppc64_linux) ( ULong val, ULong cr0so ) { |
| SysRes res; |
| res._isError = (cr0so & 1) != 0; |
| res._val = val; |
| return res; |
| } |
| |
| SysRes VG_(mk_SysRes_s390x_linux) ( Long val ) { |
| SysRes res; |
| res._isError = val >= -4095 && val <= -1; |
| if (res._isError) { |
| res._val = -val; |
| } else { |
| res._val = val; |
| } |
| return res; |
| } |
| |
| SysRes VG_(mk_SysRes_arm_linux) ( Int val ) { |
| SysRes res; |
| res._isError = val >= -4095 && val <= -1; |
| if (res._isError) { |
| res._val = (UInt)(-val); |
| } else { |
| res._val = (UInt)val; |
| } |
| return res; |
| } |
| |
| /* Generic constructors. */ |
| SysRes VG_(mk_SysRes_Error) ( UWord err ) { |
| SysRes r; |
| r._isError = True; |
| r._val = err; |
| return r; |
| } |
| |
| SysRes VG_(mk_SysRes_Success) ( UWord res ) { |
| SysRes r; |
| r._isError = False; |
| r._val = res; |
| return r; |
| } |
| |
| |
| #elif defined(VGO_aix5) |
| |
| /* AIX scheme: we have to record both 'res' (r3) and 'err' (r4). If |
| 'err' is nonzero then the call has failed, but it could still be |
| that AIX userspace will ignore 'err' and instead consult 'res' to |
| determine if the call failed. So we have to record both. */ |
| SysRes VG_(mk_SysRes_ppc32_aix5) ( UInt res, UInt err ) { |
| SysRes r; |
| r.res = res; |
| r.err = err; |
| r.isError = r.err != 0; |
| return r; |
| } |
| |
| SysRes VG_(mk_SysRes_ppc64_aix5) ( ULong res, ULong err ) { |
| SysRes r; |
| r.res = res; |
| r.err = err; |
| r.isError = r.err != 0; |
| return r; |
| } |
| |
| /* Generic constructors. */ |
| SysRes VG_(mk_SysRes_Error) ( UWord err ) { |
| SysRes r; |
| r._res = 0; |
| r._err = err; |
| r._isError = True; |
| return r; |
| } |
| |
| SysRes VG_(mk_SysRes_Success) ( UWord res ) { |
| SysRes r; |
| r._res = res; |
| r._err = 0; |
| r._isError = False; |
| return r; |
| } |
| |
| |
| #elif defined(VGO_darwin) |
| |
| /* Darwin: Some syscalls return a double-word result. */ |
| SysRes VG_(mk_SysRes_x86_darwin) ( UChar scclass, Bool isErr, |
| UInt wHI, UInt wLO ) |
| { |
| SysRes res; |
| res._wHI = 0; |
| res._wLO = 0; |
| res._mode = 0; /* invalid */ |
| vg_assert(isErr == False || isErr == True); |
| vg_assert(sizeof(UWord) == sizeof(UInt)); |
| switch (scclass) { |
| case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| res._wLO = wLO; |
| res._wHI = wHI; |
| res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MACH: |
| vg_assert(!isErr); |
| vg_assert(wHI == 0); |
| res._wLO = wLO; |
| res._mode = SysRes_MACH; |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| vg_assert(!isErr); |
| vg_assert(wHI == 0); |
| res._wLO = wLO; |
| res._mode = SysRes_MDEP; |
| break; |
| default: |
| vg_assert(0); |
| } |
| return res; |
| } |
| |
| SysRes VG_(mk_SysRes_amd64_darwin) ( UChar scclass, Bool isErr, |
| ULong wHI, ULong wLO ) |
| { |
| SysRes res; |
| res._wHI = 0; |
| res._wLO = 0; |
| res._mode = 0; /* invalid */ |
| vg_assert(isErr == False || isErr == True); |
| vg_assert(sizeof(UWord) == sizeof(ULong)); |
| switch (scclass) { |
| case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| res._wLO = wLO; |
| res._wHI = wHI; |
| res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK; |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MACH: |
| vg_assert(!isErr); |
| vg_assert(wHI == 0); |
| res._wLO = wLO; |
| res._mode = SysRes_MACH; |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| vg_assert(!isErr); |
| vg_assert(wHI == 0); |
| res._wLO = wLO; |
| res._mode = SysRes_MDEP; |
| break; |
| default: |
| vg_assert(0); |
| } |
| return res; |
| } |
| |
| /* Generic constructors. We assume (without checking if this makes |
| any sense, from the caller's point of view) that these are for the |
| UNIX style of syscall. */ |
| SysRes VG_(mk_SysRes_Error) ( UWord err ) { |
| SysRes r; |
| r._wHI = 0; |
| r._wLO = err; |
| r._mode = SysRes_UNIX_ERR; |
| return r; |
| } |
| |
| SysRes VG_(mk_SysRes_Success) ( UWord res ) { |
| SysRes r; |
| r._wHI = 0; |
| r._wLO = res; |
| r._mode = SysRes_UNIX_OK; |
| return r; |
| } |
| |
| |
| #else |
| # error "Unknown OS" |
| #endif |
| |
| |
| /* --------------------------------------------------------------------- |
| VG_(do_syscall): A function for doing syscalls. |
| ------------------------------------------------------------------ */ |
| |
| #if defined(VGP_x86_linux) |
| /* Incoming args (syscall number + up to 6 args) come on the stack. |
| (ie. the C calling convention). |
| |
| The syscall number goes in %eax. The args are passed to the syscall in |
| the regs %ebx, %ecx, %edx, %esi, %edi, %ebp, ie. the kernel's syscall |
| calling convention. |
| |
| %eax gets the return value. Not sure which registers the kernel |
| clobbers, so we preserve all the callee-save regs (%esi, %edi, %ebx, |
| %ebp). |
| */ |
| extern UWord do_syscall_WRK ( |
| UWord syscall_no, |
| UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6 |
| ); |
| asm( |
| ".text\n" |
| "do_syscall_WRK:\n" |
| " push %esi\n" |
| " push %edi\n" |
| " push %ebx\n" |
| " push %ebp\n" |
| " movl 16+ 4(%esp),%eax\n" |
| " movl 16+ 8(%esp),%ebx\n" |
| " movl 16+12(%esp),%ecx\n" |
| " movl 16+16(%esp),%edx\n" |
| " movl 16+20(%esp),%esi\n" |
| " movl 16+24(%esp),%edi\n" |
| " movl 16+28(%esp),%ebp\n" |
| " int $0x80\n" |
| " popl %ebp\n" |
| " popl %ebx\n" |
| " popl %edi\n" |
| " popl %esi\n" |
| " ret\n" |
| ".previous\n" |
| ); |
| |
| #elif defined(VGP_amd64_linux) |
| /* Incoming args (syscall number + up to 6 args) come in %rdi, %rsi, |
| %rdx, %rcx, %r8, %r9, and the last one on the stack (ie. the C |
| calling convention). |
| |
| The syscall number goes in %rax. The args are passed to the syscall in |
| the regs %rdi, %rsi, %rdx, %r10, %r8, %r9 (yes, really %r10, not %rcx), |
| ie. the kernel's syscall calling convention. |
| |
| %rax gets the return value. %rcx and %r11 are clobbered by the syscall; |
| no matter, they are caller-save (the syscall clobbers no callee-save |
| regs, so we don't have to do any register saving/restoring). |
| */ |
| extern UWord do_syscall_WRK ( |
| UWord syscall_no, |
| UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6 |
| ); |
| asm( |
| ".text\n" |
| "do_syscall_WRK:\n" |
| /* Convert function calling convention --> syscall calling |
| convention */ |
| " movq %rdi, %rax\n" |
| " movq %rsi, %rdi\n" |
| " movq %rdx, %rsi\n" |
| " movq %rcx, %rdx\n" |
| " movq %r8, %r10\n" |
| " movq %r9, %r8\n" |
| " movq 8(%rsp), %r9\n" /* last arg from stack */ |
| " syscall\n" |
| " ret\n" |
| ".previous\n" |
| ); |
| |
| #elif defined(VGP_ppc32_linux) |
| /* Incoming args (syscall number + up to 6 args) come in %r3:%r9. |
| |
| The syscall number goes in %r0. The args are passed to the syscall in |
| the regs %r3:%r8, i.e. the kernel's syscall calling convention. |
| |
| The %cr0.so bit flags an error. |
| We return the syscall return value in %r3, and the %cr0.so in |
| the lowest bit of %r4. |
| We return a ULong, of which %r3 is the high word, and %r4 the low. |
| No callee-save regs are clobbered, so no saving/restoring is needed. |
| */ |
| extern ULong do_syscall_WRK ( |
| UWord syscall_no, |
| UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6 |
| ); |
| asm( |
| ".text\n" |
| "do_syscall_WRK:\n" |
| " mr 0,3\n" |
| " mr 3,4\n" |
| " mr 4,5\n" |
| " mr 5,6\n" |
| " mr 6,7\n" |
| " mr 7,8\n" |
| " mr 8,9\n" |
| " sc\n" /* syscall: sets %cr0.so on error */ |
| " mfcr 4\n" /* %cr -> low word of return var */ |
| " rlwinm 4,4,4,31,31\n" /* rotate flag bit so to lsb, and mask it */ |
| " blr\n" /* and return */ |
| ".previous\n" |
| ); |
| |
| #elif defined(VGP_ppc64_linux) |
| /* Due to the need to return 65 bits of result, this is completely |
| different from the ppc32 case. The single arg register points to a |
| 7-word block containing the syscall # and the 6 args. The syscall |
| result proper is put in [0] of the block, and %cr0.so is in the |
| bottom bit of [1]. */ |
| extern void do_syscall_WRK ( ULong* argblock ); |
| asm( |
| ".align 2\n" |
| ".globl do_syscall_WRK\n" |
| ".section \".opd\",\"aw\"\n" |
| ".align 3\n" |
| "do_syscall_WRK:\n" |
| ".quad .do_syscall_WRK,.TOC.@tocbase,0\n" |
| ".previous\n" |
| ".type .do_syscall_WRK,@function\n" |
| ".globl .do_syscall_WRK\n" |
| ".do_syscall_WRK:\n" |
| " std 3,-16(1)\n" /* stash arg */ |
| " ld 8, 48(3)\n" /* sc arg 6 */ |
| " ld 7, 40(3)\n" /* sc arg 5 */ |
| " ld 6, 32(3)\n" /* sc arg 4 */ |
| " ld 5, 24(3)\n" /* sc arg 3 */ |
| " ld 4, 16(3)\n" /* sc arg 2 */ |
| " ld 0, 0(3)\n" /* sc number */ |
| " ld 3, 8(3)\n" /* sc arg 1 */ |
| " sc\n" /* result in r3 and cr0.so */ |
| " ld 5,-16(1)\n" /* reacquire argblock ptr (r5 is caller-save) */ |
| " std 3,0(5)\n" /* argblock[0] = r3 */ |
| " mfcr 3\n" |
| " srwi 3,3,28\n" |
| " andi. 3,3,1\n" |
| " std 3,8(5)\n" /* argblock[1] = cr0.s0 & 1 */ |
| " blr\n" |
| ); |
| |
| #elif defined(VGP_arm_linux) |
| /* I think the conventions are: |
| args in r0 r1 r2 r3 r4 r5 |
| sysno in r7 |
| return value in r0, w/ same conventions as x86-linux, viz r0 in |
| -4096 .. -1 is an error value. All other values are success |
| values. |
| */ |
| extern UWord do_syscall_WRK ( |
| UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6, |
| UWord syscall_no |
| ); |
| asm( |
| ".text\n" |
| "do_syscall_WRK:\n" |
| " push {r4, r5, r7}\n" |
| " ldr r4, [sp, #12]\n" |
| " ldr r5, [sp, #16]\n" |
| " ldr r7, [sp, #20]\n" |
| " svc 0x0\n" |
| " pop {r4, r5, r7}\n" |
| " bx lr\n" |
| ".previous\n" |
| ); |
| |
| #elif defined(VGP_ppc32_aix5) |
| static void do_syscall_WRK ( UWord* res_r3, UWord* res_r4, |
| UWord sysno, |
| UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6, |
| UWord a7, UWord a8 ) |
| { |
| /* Syscalls on AIX are very similar to function calls: |
| - up to 8 args in r3-r10 |
| - syscall number in r2 |
| - kernel resumes at 'lr', so must set it appropriately beforehand |
| - r3 holds the result and r4 any applicable error code |
| See http://www.cs.utexas.edu/users/cart/publications/tr00-04.ps |
| and also 'man truss'. |
| */ |
| /* For some reason gcc-3.3.2 doesn't preserve r31 across the asm |
| even though we state it to be trashed. So use r27 instead. */ |
| UWord args[9]; |
| args[0] = sysno; |
| args[1] = a1; args[2] = a2; |
| args[3] = a3; args[4] = a4; |
| args[5] = a5; args[6] = a6; |
| args[7] = a7; args[8] = a8; |
| |
| __asm__ __volatile__( |
| |
| // establish base ptr |
| "mr 28,%0\n\t" |
| |
| // save r2, lr |
| "mr 27,2\n\t" // save r2 in r27 |
| "mflr 30\n\t" // save lr in r30 |
| |
| // set syscall number and args |
| "lwz 2, 0(28)\n\t" |
| "lwz 3, 4(28)\n\t" |
| "lwz 4, 8(28)\n\t" |
| "lwz 5, 12(28)\n\t" |
| "lwz 6, 16(28)\n\t" |
| "lwz 7, 20(28)\n\t" |
| "lwz 8, 24(28)\n\t" |
| "lwz 9, 28(28)\n\t" |
| "lwz 10, 32(28)\n\t" |
| |
| // set bit 3 of CR1 otherwise AIX 5.1 returns to the |
| // wrong address after the sc instruction |
| "crorc 6,6,6\n\t" |
| |
| // set up LR to point just after the sc insn |
| ".long 0x48000005\n\t" // "bl here+4" -- lr := & next insn |
| "mflr 29\n\t" |
| "addi 29,29,16\n\t" |
| "mtlr 29\n\t" |
| |
| // do it! |
| "sc\n\t" |
| |
| // result is now in r3; save it in args[0] |
| "stw 3,0(28)\n\t" |
| // error code in r4; save it in args[1] |
| "stw 4,4(28)\n\t" |
| |
| // restore |
| "mr 2,27\n\t" |
| "mtlr 30\n\t" |
| |
| : /*out*/ |
| : /*in*/ "b" (&args[0]) |
| : /*trash*/ |
| /*temps*/ "r31","r30","r29","r28","r27", |
| /*args*/ "r3","r4","r5","r6","r7","r8","r9","r10", |
| /*paranoia*/ "memory","cc","r0","r1","r11","r12","r13", |
| "xer","ctr","cr0","cr1","cr2","cr3", |
| "cr4","cr5","cr6","cr7" |
| ); |
| |
| *res_r3 = args[0]; |
| *res_r4 = args[1]; |
| } |
| |
| #elif defined(VGP_ppc64_aix5) |
| static void do_syscall_WRK ( UWord* res_r3, UWord* res_r4, |
| UWord sysno, |
| UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6, |
| UWord a7, UWord a8 ) |
| { |
| /* Same scheme as ppc32-aix5. */ |
| UWord args[9]; |
| args[0] = sysno; |
| args[1] = a1; args[2] = a2; |
| args[3] = a3; args[4] = a4; |
| args[5] = a5; args[6] = a6; |
| args[7] = a7; args[8] = a8; |
| |
| __asm__ __volatile__( |
| |
| // establish base ptr |
| "mr 28,%0\n\t" |
| |
| // save r2, lr |
| "mr 27,2\n\t" // save r2 in r27 |
| "mflr 30\n\t" // save lr in r30 |
| |
| // set syscall number and args |
| "ld 2, 0(28)\n\t" |
| "ld 3, 8(28)\n\t" |
| "ld 4, 16(28)\n\t" |
| "ld 5, 24(28)\n\t" |
| "ld 6, 32(28)\n\t" |
| "ld 7, 40(28)\n\t" |
| "ld 8, 48(28)\n\t" |
| "ld 9, 56(28)\n\t" |
| "ld 10, 64(28)\n\t" |
| |
| // set bit 3 of CR1 otherwise AIX 5.1 returns to the |
| // wrong address after the sc instruction |
| "crorc 6,6,6\n\t" |
| |
| // set up LR to point just after the sc insn |
| ".long 0x48000005\n\t" // "bl here+4" -- lr := & next insn |
| "mflr 29\n\t" |
| "addi 29,29,16\n\t" |
| "mtlr 29\n\t" |
| |
| // do it! |
| "sc\n\t" |
| |
| // result is now in r3; save it in args[0] |
| "std 3,0(28)\n\t" |
| // error code in r4; save it in args[1] |
| "std 4,8(28)\n\t" |
| |
| // restore |
| "mr 2,27\n\t" |
| "mtlr 30\n\t" |
| |
| : /*out*/ |
| : /*in*/ "b" (&args[0]) |
| : /*trash*/ |
| /*temps*/ "r31","r30","r29","r28","r27", |
| /*args*/ "r3","r4","r5","r6","r7","r8","r9","r10", |
| /*paranoia*/ "memory","cc","r0","r1","r11","r12","r13", |
| "xer","ctr","cr0","cr1","cr2","cr3", |
| "cr4","cr5","cr6","cr7" |
| ); |
| |
| *res_r3 = args[0]; |
| *res_r4 = args[1]; |
| } |
| |
| #elif defined(VGP_x86_darwin) |
| |
| /* Incoming args (syscall number + up to 8 args) come in on the stack |
| |
| The kernel's syscall calling convention is: |
| * the syscall number goes in eax |
| * the args are passed to the syscall on the stack, |
| pushed onto the stack R->L (that is, the usual x86 |
| calling conventions, with the leftmost arg at the lowest |
| address) |
| Call instruction: |
| * UNIX: sysenter |
| * UNIX: int $0x80 |
| * MACH: int $0x81 |
| * MDEP: int $0x82 |
| Note that the call type can be determined from the syscall number; |
| there is no need to inspect the actual instruction. Although obviously |
| the instruction must match. |
| Return value: |
| * MACH,MDEP: the return value comes back in eax |
| * UNIX: the return value comes back in edx:eax (hi32:lo32) |
| Error: |
| * MACH,MDEP: no error is returned |
| * UNIX: the carry flag indicates success or failure |
| |
| nb here, sizeof(UWord) == sizeof(UInt) |
| */ |
| |
| __private_extern__ ULong |
| do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ |
| UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ |
| UWord a7, UWord a8, /* 28(esp)..32(esp) */ |
| UWord syscall_no, /* 36(esp) */ |
| /*OUT*/UInt* errflag /* 40(esp) */ ); |
| // Unix syscall: 64-bit return in edx:eax, with LSB in eax |
| // error indicated by carry flag: clear=good, set=bad |
| asm(".private_extern _do_syscall_unix_WRK\n" |
| "_do_syscall_unix_WRK:\n" |
| " movl 40(%esp), %ecx \n" /* assume syscall success */ |
| " movl $0, (%ecx) \n" |
| " movl 36(%esp), %eax \n" |
| " int $0x80 \n" |
| " jnc 1f \n" /* jump if success */ |
| " movl 40(%esp), %ecx \n" /* syscall failed - set *errflag */ |
| " movl $1, (%ecx) \n" |
| " 1: ret \n" |
| ); |
| |
| __private_extern__ UInt |
| do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ |
| UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ |
| UWord a7, UWord a8, /* 28(esp)..32(esp) */ |
| UWord syscall_no /* 36(esp) */ ); |
| // Mach trap: 32-bit result in %eax, no error flag |
| asm(".private_extern _do_syscall_mach_WRK\n" |
| "_do_syscall_mach_WRK:\n" |
| " movl 36(%esp), %eax \n" |
| " int $0x81 \n" |
| " ret \n" |
| ); |
| |
| __private_extern__ UInt |
| do_syscall_mdep_WRK ( UWord a1, UWord a2, UWord a3, /* 4(esp)..12(esp) */ |
| UWord a4, UWord a5, UWord a6, /* 16(esp)..24(esp) */ |
| UWord a7, UWord a8, /* 28(esp)..32(esp) */ |
| UWord syscall_no /* 36(esp) */ ); |
| // mdep trap: 32-bit result in %eax, no error flag |
| asm( |
| ".private_extern _do_syscall_mdep_WRK\n" |
| "_do_syscall_mdep_WRK:\n" |
| " movl 36(%esp), %eax \n" |
| " int $0x82 \n" |
| " ret \n" |
| ); |
| |
| |
| #elif defined(VGP_amd64_darwin) |
| |
| /* Incoming args (syscall number + up to 8 args) come in registers and stack |
| |
| The kernel's syscall calling convention is: |
| * the syscall number goes in rax |
| * the args are passed to the syscall in registers and the stack |
| * the call instruction is 'syscall' |
| Return value: |
| * MACH,MDEP: the return value comes back in rax |
| * UNIX: the return value comes back in rdx:rax (hi64:lo64) |
| Error: |
| * MACH,MDEP: no error is returned |
| * UNIX: the carry flag indicates success or failure |
| |
| nb here, sizeof(UWord) == sizeof(ULong) |
| */ |
| |
| __private_extern__ UWord |
| do_syscall_unix_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ |
| UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ |
| UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ |
| UWord syscall_no, /* 24(rsp) */ |
| /*OUT*/ULong* errflag, /* 32(rsp) */ |
| /*OUT*/ULong* res2 ); /* 40(rsp) */ |
| // Unix syscall: 128-bit return in rax:rdx, with LSB in rax |
| // error indicated by carry flag: clear=good, set=bad |
| asm(".private_extern _do_syscall_unix_WRK\n" |
| "_do_syscall_unix_WRK:\n" |
| " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ |
| " movq 32(%rsp), %rax \n" /* assume syscall success */ |
| " movq $0, (%rax) \n" |
| " movq 24(%rsp), %rax \n" /* load syscall_no */ |
| " syscall \n" |
| " jnc 1f \n" /* jump if success */ |
| " movq 32(%rsp), %rcx \n" /* syscall failed - set *errflag */ |
| " movq $1, (%rcx) \n" |
| " 1: movq 40(%rsp), %rcx \n" /* save 2nd result word */ |
| " movq %rdx, (%rcx) \n" |
| " retq \n" /* return 1st result word */ |
| ); |
| |
| __private_extern__ UWord |
| do_syscall_mach_WRK ( UWord a1, UWord a2, UWord a3, /* rdi, rsi, rdx */ |
| UWord a4, UWord a5, UWord a6, /* rcx, r8, r9 */ |
| UWord a7, UWord a8, /* 8(rsp), 16(rsp) */ |
| UWord syscall_no ); /* 24(rsp) */ |
| // Mach trap: 64-bit result, no error flag |
| asm(".private_extern _do_syscall_mach_WRK\n" |
| "_do_syscall_mach_WRK:\n" |
| " movq %rcx, %r10 \n" /* pass rcx in r10 instead */ |
| " movq 24(%rsp), %rax \n" /* load syscall_no */ |
| " syscall \n" |
| " retq \n" |
| ); |
| |
| #elif defined(VGP_s390x_linux) |
| |
| static UWord do_syscall_WRK ( |
| UWord syscall_no, |
| UWord arg1, UWord arg2, UWord arg3, |
| UWord arg4, UWord arg5, UWord arg6 |
| ) |
| { |
| register UWord __arg1 asm("2") = arg1; |
| register UWord __arg2 asm("3") = arg2; |
| register UWord __arg3 asm("4") = arg3; |
| register UWord __arg4 asm("5") = arg4; |
| register UWord __arg5 asm("6") = arg5; |
| register UWord __arg6 asm("7") = arg6; |
| register ULong __svcres asm("2"); |
| |
| __asm__ __volatile__ ( |
| "lgr %%r1,%1\n\t" |
| "svc 0\n\t" |
| : "=d" (__svcres) |
| : "a" (syscall_no), |
| "0" (__arg1), |
| "d" (__arg2), |
| "d" (__arg3), |
| "d" (__arg4), |
| "d" (__arg5), |
| "d" (__arg6) |
| : "1", "cc", "memory"); |
| |
| return (UWord) (__svcres); |
| } |
| |
| #else |
| # error Unknown platform |
| #endif |
| |
| |
| /* Finally, the generic code. This sends the call to the right |
| helper. */ |
| |
| SysRes VG_(do_syscall) ( UWord sysno, UWord a1, UWord a2, UWord a3, |
| UWord a4, UWord a5, UWord a6, |
| UWord a7, UWord a8 ) |
| { |
| # if defined(VGP_x86_linux) |
| UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); |
| return VG_(mk_SysRes_x86_linux)( val ); |
| |
| # elif defined(VGP_amd64_linux) |
| UWord val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); |
| return VG_(mk_SysRes_amd64_linux)( val ); |
| |
| # elif defined(VGP_ppc32_linux) |
| ULong ret = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); |
| UInt val = (UInt)(ret>>32); |
| UInt cr0so = (UInt)(ret); |
| return VG_(mk_SysRes_ppc32_linux)( val, cr0so ); |
| |
| # elif defined(VGP_ppc64_linux) |
| ULong argblock[7]; |
| argblock[0] = sysno; |
| argblock[1] = a1; |
| argblock[2] = a2; |
| argblock[3] = a3; |
| argblock[4] = a4; |
| argblock[5] = a5; |
| argblock[6] = a6; |
| do_syscall_WRK( &argblock[0] ); |
| return VG_(mk_SysRes_ppc64_linux)( argblock[0], argblock[1] ); |
| |
| # elif defined(VGP_arm_linux) |
| UWord val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno); |
| return VG_(mk_SysRes_arm_linux)( val ); |
| |
| # elif defined(VGP_ppc32_aix5) |
| UWord res; |
| UWord err; |
| do_syscall_WRK( &res, &err, |
| sysno, a1, a2, a3, a4, a5, a6, a7, a8); |
| /* Try to set the error number to zero if the syscall hasn't |
| really failed. */ |
| if (sysno == __NR_AIX5_kread |
| || sysno == __NR_AIX5_kwrite) { |
| if (res != (UWord)-1L) |
| err = 0; |
| } |
| else if (sysno == __NR_AIX5_sigprocmask |
| || sysno == __NR_AIX5__sigpending) { |
| if (res == 0) |
| err = 0; |
| } |
| return VG_(mk_SysRes_ppc32_aix5)( res, err ); |
| |
| # elif defined(VGP_ppc64_aix5) |
| UWord res; |
| UWord err; |
| do_syscall_WRK( &res, &err, |
| sysno, a1, a2, a3, a4, a5, a6, a7, a8); |
| /* Try to set the error number to zero if the syscall hasn't |
| really failed. */ |
| if (sysno == __NR_AIX5_kread |
| || sysno == __NR_AIX5_kwrite) { |
| if (res != (UWord)-1L) |
| err = 0; |
| } |
| else if (sysno == __NR_AIX5_sigprocmask |
| || sysno == __NR_AIX5__sigpending) { |
| if (res == 0) |
| err = 0; |
| } |
| return VG_(mk_SysRes_ppc64_aix5)( res, err ); |
| |
| # elif defined(VGP_x86_darwin) |
| UInt wLO = 0, wHI = 0, err = 0; |
| ULong u64; |
| UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); |
| switch (scclass) { |
| case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| u64 = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, |
| VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err); |
| wLO = (UInt)u64; |
| wHI = (UInt)(u64 >> 32); |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MACH: |
| wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, |
| VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); |
| err = 0; |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| wLO = do_syscall_mdep_WRK(a1,a2,a3,a4,a5,a6,a7,a8, |
| VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); |
| err = 0; |
| break; |
| default: |
| vg_assert(0); |
| break; |
| } |
| return VG_(mk_SysRes_x86_darwin)( scclass, err ? True : False, wHI, wLO ); |
| |
| # elif defined(VGP_amd64_darwin) |
| ULong wLO = 0, wHI = 0, err = 0; |
| UChar scclass = VG_DARWIN_SYSNO_CLASS(sysno); |
| switch (scclass) { |
| case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| wLO = do_syscall_unix_WRK(a1,a2,a3,a4,a5,a6,a7,a8, |
| VG_DARWIN_SYSNO_FOR_KERNEL(sysno), &err, &wHI); |
| break; |
| case VG_DARWIN_SYSCALL_CLASS_MACH: |
| case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| wLO = do_syscall_mach_WRK(a1,a2,a3,a4,a5,a6,a7,a8, |
| VG_DARWIN_SYSNO_FOR_KERNEL(sysno)); |
| err = 0; |
| break; |
| default: |
| vg_assert(0); |
| break; |
| } |
| return VG_(mk_SysRes_amd64_darwin)( scclass, err ? True : False, wHI, wLO ); |
| |
| #elif defined(VGP_s390x_linux) |
| UWord val; |
| |
| if (sysno == __NR_mmap) { |
| ULong argbuf[6]; |
| |
| argbuf[0] = a1; |
| argbuf[1] = a2; |
| argbuf[2] = a3; |
| argbuf[3] = a4; |
| argbuf[4] = a5; |
| argbuf[5] = a6; |
| val = do_syscall_WRK(sysno,(UWord)&argbuf[0],0,0,0,0,0); |
| } else { |
| val = do_syscall_WRK(sysno,a1,a2,a3,a4,a5,a6); |
| } |
| |
| return VG_(mk_SysRes_s390x_linux)( val ); |
| #else |
| # error Unknown platform |
| #endif |
| } |
| |
| /* --------------------------------------------------------------------- |
| Names of errors. |
| ------------------------------------------------------------------ */ |
| |
| /* Return a string which gives the name of an error value. Note, |
| unlike the standard C syserror fn, the returned string is not |
| malloc-allocated or writable -- treat it as a constant. |
| TODO: implement this properly. */ |
| |
| const HChar* VG_(strerror) ( UWord errnum ) |
| { |
| switch (errnum) { |
| case VKI_EPERM: return "Operation not permitted"; |
| case VKI_ENOENT: return "No such file or directory"; |
| case VKI_ESRCH: return "No such process"; |
| case VKI_EINTR: return "Interrupted system call"; |
| case VKI_EBADF: return "Bad file number"; |
| case VKI_EAGAIN: return "Try again"; |
| case VKI_ENOMEM: return "Out of memory"; |
| case VKI_EACCES: return "Permission denied"; |
| case VKI_EFAULT: return "Bad address"; |
| case VKI_EEXIST: return "File exists"; |
| case VKI_EINVAL: return "Invalid argument"; |
| case VKI_EMFILE: return "Too many open files"; |
| case VKI_ENOSYS: return "Function not implemented"; |
| case VKI_EOVERFLOW: return "Value too large for defined data type"; |
| # if defined(VKI_ERESTARTSYS) |
| case VKI_ERESTARTSYS: return "ERESTARTSYS"; |
| # endif |
| default: return "VG_(strerror): unknown error"; |
| } |
| } |
| |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |