mirror of
git://sourceware.org/git/valgrind.git
synced 2026-01-12 00:19:31 +08:00
fa73fe4bfe
I recently changed the amd64 syscall to lower the max number of args handled but didn't update the corresponding comment.
1487 lines
46 KiB
C
1487 lines
46 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Doing syscalls. m_syscall.c ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2017 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "pub_core_basics.h"
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#include "pub_core_libcassert.h"
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#include "pub_core_vki.h"
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#include "pub_core_vkiscnums.h"
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#include "pub_core_syscall.h"
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/* ---------------------------------------------------------------------
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Building syscall return values.
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------------------------------------------------------------------ */
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/* Make a SysRes value from a syscall return value. This is
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platform specific. */
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#if defined(VGP_mips32_linux) || defined(VGP_mips64_linux)
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SysRes VG_(mk_SysRes_mips32_linux) ( UWord v0, UWord v1, UWord a3 ) {
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/* MIPS uses a3 != 0 to flag an error */
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SysRes res;
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res._isError = (a3 != (UWord)0);
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res._val = v0;
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res._valEx = v1;
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return res;
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}
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SysRes VG_(mk_SysRes_mips64_linux) ( ULong v0, ULong v1, ULong a3 ) {
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/* MIPS uses a3 != 0 to flag an error */
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SysRes res;
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res._isError = (a3 != (ULong)0);
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res._val = v0;
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res._valEx = v1;
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return res;
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}
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/* Generic constructors. */
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SysRes VG_(mk_SysRes_Error) ( UWord err ) {
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SysRes r;
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r._isError = True;
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r._val = err;
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r._valEx = 0;
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return r;
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}
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SysRes VG_(mk_SysRes_Success) ( UWord res ) {
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SysRes r;
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r._isError = False;
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r._val = res;
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r._valEx = 0;
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return r;
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}
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SysRes VG_(mk_SysRes_SuccessEx) ( UWord res, UWord resEx ) {
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SysRes r;
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r._isError = False;
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r._val = res;
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r._valEx = resEx;
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return r;
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}
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#elif defined(VGO_linux) \
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&& !defined(VGP_mips32_linux) && !defined(VGP_mips64_linux)
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/*
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From:
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http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/unix/sysv/
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linux/i386/sysdep.h?
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rev=1.28&content-type=text/x-cvsweb-markup&cvsroot=glibc
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Linux uses a negative return value to indicate syscall errors,
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unlike most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be
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negative even if the call succeeded. E.g., the 'lseek' system call
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might return a large offset. Therefore we must not anymore test
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for < 0, but test for a real error by making sure the value in %eax
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is a real error number. Linus said he will make sure the no
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syscall returns a value in -1 .. -4095 as a valid result so we can
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safely test with -4095.
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*/
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SysRes VG_(mk_SysRes_nanomips_linux) ( UWord a0 ) {
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SysRes res;
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res._isError = (a0 > 0xFFFFF000ul);
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res._val = a0;
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return res;
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}
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SysRes VG_(mk_SysRes_x86_linux) ( Int val ) {
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SysRes res;
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res._isError = val >= -4095 && val <= -1;
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if (res._isError) {
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res._val = (UInt)(-val);
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} else {
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res._val = (UInt)val;
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}
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return res;
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}
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/* Similarly .. */
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SysRes VG_(mk_SysRes_amd64_linux) ( Long val ) {
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SysRes res;
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res._isError = val >= -4095 && val <= -1;
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if (res._isError) {
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res._val = (ULong)(-val);
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} else {
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res._val = (ULong)val;
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}
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return res;
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}
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/* PPC uses the CR7.SO bit to flag an error (CR0 in IBM-speak) */
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/* Note this must be in the bottom bit of the second arg */
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SysRes VG_(mk_SysRes_ppc32_linux) ( UInt val, UInt cr0so ) {
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SysRes res;
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res._isError = (cr0so & 1) != 0;
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res._val = val;
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return res;
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}
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/* As per ppc32 version, for the sc instruction cr0.so must be in
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l.s.b. of 2nd arg.
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For the scv 0 instruction, the return value indicates failure if
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it is -4095..-1 (i.e., it is >= -MAX_ERRNO (-4095) as an unsigned
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comparison), in which case the error value is the negated return value. */
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SysRes VG_(mk_SysRes_ppc64_linux) ( ULong val, ULong cr0so, UInt flag ) {
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SysRes res;
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if (flag == SC_FLAG) {
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/* sc instruction */
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res._isError = (cr0so & 1) != 0;
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res._val = val;
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} else if (flag == SCV_FLAG) {
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/* scv instruction */
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if ( (Long)val >= -4095 && (Long)val <= -1) {
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res._isError = True;
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res._val = (ULong)(-val);
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} else {
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res._isError = False;
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res._val = (ULong)(val);
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}
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} else
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vg_assert(0);
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return res;
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}
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SysRes VG_(mk_SysRes_s390x_linux) ( Long val ) {
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SysRes res;
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res._isError = val >= -4095 && val <= -1;
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if (res._isError) {
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res._val = -val;
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} else {
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res._val = val;
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}
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return res;
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}
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SysRes VG_(mk_SysRes_arm_linux) ( Int val ) {
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SysRes res;
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res._isError = val >= -4095 && val <= -1;
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if (res._isError) {
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res._val = (UInt)(-val);
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} else {
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res._val = (UInt)val;
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}
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return res;
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}
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SysRes VG_(mk_SysRes_arm64_linux) ( Long val ) {
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SysRes res;
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res._isError = val >= -4095 && val <= -1;
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if (res._isError) {
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res._val = (ULong)(-val);
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} else {
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res._val = (ULong)val;
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}
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return res;
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}
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SysRes VG_(mk_SysRes_riscv64_linux) ( Long val ) {
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SysRes res;
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res._isError = val >= -4095 && val <= -1;
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if (res._isError) {
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res._val = (ULong)(-val);
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} else {
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res._val = (ULong)val;
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}
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return res;
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}
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/* Generic constructors. */
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SysRes VG_(mk_SysRes_Success) ( UWord res ) {
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SysRes r;
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r._isError = False;
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r._val = res;
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return r;
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}
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#if defined(VGP_nanomips_linux)
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SysRes VG_(mk_SysRes_Error) ( UWord err ) {
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SysRes r;
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r._isError = True;
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r._val = (UWord)(-(Word)err);
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return r;
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}
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#else
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SysRes VG_(mk_SysRes_Error) ( UWord err ) {
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SysRes r;
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r._isError = True;
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r._val = err;
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return r;
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}
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#endif
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#elif defined(VGO_darwin)
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/* Darwin: Some syscalls return a double-word result. */
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SysRes VG_(mk_SysRes_x86_darwin) ( UChar scclass, Bool isErr,
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UInt wHI, UInt wLO )
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{
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SysRes res;
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res._wHI = 0;
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res._wLO = 0;
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res._mode = 0; /* invalid */
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vg_assert(isErr == False || isErr == True);
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vg_assert(sizeof(UWord) == sizeof(UInt));
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switch (scclass) {
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case VG_DARWIN_SYSCALL_CLASS_UNIX:
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res._wLO = wLO;
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res._wHI = wHI;
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res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK;
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break;
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case VG_DARWIN_SYSCALL_CLASS_MACH:
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vg_assert(!isErr);
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vg_assert(wHI == 0);
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res._wLO = wLO;
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res._mode = SysRes_MACH;
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break;
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case VG_DARWIN_SYSCALL_CLASS_MDEP:
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vg_assert(!isErr);
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vg_assert(wHI == 0);
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res._wLO = wLO;
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res._mode = SysRes_MDEP;
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break;
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default:
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vg_assert(0);
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}
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return res;
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}
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SysRes VG_(mk_SysRes_amd64_darwin) ( UChar scclass, Bool isErr,
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ULong wHI, ULong wLO )
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{
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SysRes res;
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res._wHI = 0;
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res._wLO = 0;
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res._mode = 0; /* invalid */
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vg_assert(isErr == False || isErr == True);
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vg_assert(sizeof(UWord) == sizeof(ULong));
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switch (scclass) {
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case VG_DARWIN_SYSCALL_CLASS_UNIX:
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res._wLO = wLO;
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res._wHI = wHI;
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res._mode = isErr ? SysRes_UNIX_ERR : SysRes_UNIX_OK;
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break;
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case VG_DARWIN_SYSCALL_CLASS_MACH:
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vg_assert(!isErr);
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vg_assert(wHI == 0);
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res._wLO = wLO;
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res._mode = SysRes_MACH;
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break;
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case VG_DARWIN_SYSCALL_CLASS_MDEP:
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vg_assert(!isErr);
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vg_assert(wHI == 0);
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res._wLO = wLO;
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res._mode = SysRes_MDEP;
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break;
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default:
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vg_assert(0);
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}
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return res;
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}
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/* Generic constructors. We assume (without checking if this makes
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any sense, from the caller's point of view) that these are for the
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UNIX style of syscall. */
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SysRes VG_(mk_SysRes_Error) ( UWord err ) {
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SysRes r;
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r._wHI = 0;
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r._wLO = err;
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r._mode = SysRes_UNIX_ERR;
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return r;
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}
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SysRes VG_(mk_SysRes_Success) ( UWord res ) {
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SysRes r;
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r._wHI = 0;
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r._wLO = res;
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r._mode = SysRes_UNIX_OK;
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return r;
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}
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#elif defined(VGO_solaris)
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/* Generic constructors. */
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SysRes VG_(mk_SysRes_Error) ( UWord err ) {
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SysRes r;
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r._val = err;
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r._val2 = 0;
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r._isError = True;
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return r;
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}
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SysRes VG_(mk_SysRes_Success) ( UWord res ) {
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SysRes r;
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r._val = res;
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r._val2 = 0;
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r._isError = False;
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return r;
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}
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SysRes VG_(mk_SysRes_x86_solaris) ( Bool isErr, UInt val, UInt val2 )
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{
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SysRes res;
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// stay sane
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vg_assert(isErr == True || isErr == False);
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res._val = val;
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res._val2 = val2;
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res._isError = isErr;
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return res;
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}
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SysRes VG_(mk_SysRes_amd64_solaris) ( Bool isErr, ULong val, ULong val2 )
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{
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SysRes res;
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// stay sane
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vg_assert(isErr == True || isErr == False);
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res._val = val;
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res._val2 = val2;
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res._isError = isErr;
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return res;
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}
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#elif defined(VGO_freebsd)
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SysRes VG_(mk_SysRes_x86_freebsd) ( UInt val, UInt val2, Bool err ) {
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SysRes r;
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r._isError = err;
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r._val = val;
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r._val2 = val2;
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return r;
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}
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SysRes VG_(mk_SysRes_amd64_freebsd) ( ULong val, ULong val2, Bool err ) {
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SysRes r;
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r._isError = err;
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r._val = val;
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r._val2 = val2;
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return r;
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}
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SysRes VG_(mk_SysRes_arm64_freebsd) ( ULong val, ULong val2, Bool err ) {
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SysRes r;
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r._isError = err;
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r._val = val;
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r._val2 = val2;
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return r;
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}
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/* Generic constructors. */
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SysRes VG_(mk_SysRes_Error) ( UWord err ) {
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SysRes r;
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r._val = err;
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r._val2 = 0;
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r._isError = True;
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return r;
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}
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SysRes VG_(mk_SysRes_Success) ( UWord res ) {
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SysRes r;
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r._val = res;
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r._val2 = 0;
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r._isError = False;
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return r;
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}
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#else
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# error "Unknown OS"
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#endif
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/* ---------------------------------------------------------------------
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VG_(do_syscall): A function for doing syscalls.
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------------------------------------------------------------------ */
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#if defined(VGP_x86_linux)
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/* Incoming args (syscall number + up to 6 args) come on the stack.
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(ie. the C calling convention).
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The syscall number goes in %eax. The args are passed to the syscall in
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the regs %ebx, %ecx, %edx, %esi, %edi, %ebp, ie. the kernel's syscall
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calling convention.
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%eax gets the return value. Not sure which registers the kernel
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clobbers, so we preserve all the callee-save regs (%esi, %edi, %ebx,
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%ebp).
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*/
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extern UWord do_syscall_WRK (
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UWord syscall_no,
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UWord a1, UWord a2, UWord a3,
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UWord a4, UWord a5, UWord a6
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);
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asm(
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".text\n"
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".globl do_syscall_WRK\n"
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"do_syscall_WRK:\n"
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" .cfi_startproc\n"
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" push %esi\n"
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" .cfi_adjust_cfa_offset 4\n"
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" .cfi_offset %esi, -8\n"
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" push %edi\n"
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" .cfi_adjust_cfa_offset 4\n"
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" .cfi_offset %edi, -12\n"
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" push %ebx\n"
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" .cfi_adjust_cfa_offset 4\n"
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" .cfi_offset %ebx, -16\n"
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" push %ebp\n"
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" .cfi_adjust_cfa_offset 4\n"
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" .cfi_offset %ebp, -20\n"
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" movl 16+ 4(%esp),%eax\n"
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" movl 16+ 8(%esp),%ebx\n"
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" movl 16+12(%esp),%ecx\n"
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" movl 16+16(%esp),%edx\n"
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" movl 16+20(%esp),%esi\n"
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" movl 16+24(%esp),%edi\n"
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" movl 16+28(%esp),%ebp\n"
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" int $0x80\n"
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" popl %ebp\n"
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" .cfi_adjust_cfa_offset -4\n"
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" .cfi_restore %ebp\n"
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" popl %ebx\n"
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" .cfi_adjust_cfa_offset -4\n"
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|
" .cfi_restore %ebx\n"
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" popl %edi\n"
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" .cfi_adjust_cfa_offset -4\n"
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|
" .cfi_restore %edi\n"
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|
" popl %esi\n"
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" .cfi_adjust_cfa_offset -4\n"
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" .cfi_restore %esi\n"
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" ret\n"
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" .cfi_endproc\n"
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|
".previous\n"
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|
);
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#elif defined(VGP_amd64_linux)
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/* Incoming args (syscall number + up to 6 args) come in %rdi, %rsi,
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%rdx, %rcx, %r8, %r9, and the last one on the stack (ie. the C
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calling convention).
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The syscall number goes in %rax. The args are passed to the syscall in
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the regs %rdi, %rsi, %rdx, %r10, %r8, %r9 (yes, really %r10, not %rcx),
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ie. the kernel's syscall calling convention.
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%rax gets the return value. %rcx and %r11 are clobbered by the syscall;
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no matter, they are caller-save (the syscall clobbers no callee-save
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regs, so we don't have to do any register saving/restoring).
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*/
|
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extern UWord do_syscall_WRK (
|
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UWord syscall_no,
|
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UWord a1, UWord a2, UWord a3,
|
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UWord a4, UWord a5, UWord a6
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);
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|
asm(
|
|
".text\n"
|
|
".globl do_syscall_WRK\n"
|
|
"do_syscall_WRK:\n"
|
|
/* Convert function calling convention --> syscall calling
|
|
convention */
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|
" movq %rdi, %rax\n"
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|
" 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"
|
|
".globl do_syscall_WRK\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_ppc64be_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_ppc64le_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 );
|
|
/* Little Endian supports ELF version 2. In the future, it may support
|
|
* other versions as well.
|
|
*/
|
|
asm(
|
|
".align 2\n"
|
|
".globl do_syscall_WRK\n"
|
|
".type do_syscall_WRK,@function\n"
|
|
"do_syscall_WRK:\n"
|
|
"#if _CALL_ELF == 2" "\n"
|
|
"0: addis 2,12,.TOC.-0b@ha\n"
|
|
" addi 2,2,.TOC.-0b@l\n"
|
|
" .localentry do_syscall_WRK, .-do_syscall_WRK\n"
|
|
"#endif" "\n"
|
|
/* Check which system call instruction to issue*/
|
|
" ld 8, 56(3)\n" /* arg 7 holds sc/scv flag */
|
|
" cmpdi 8,1\n" /* check sc/scv flag not equal to SC_FLAG*/
|
|
" bne issue_scv\n"
|
|
|
|
/* setup and issue the sc instruction */
|
|
" 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" /* return */
|
|
|
|
/* setup to do scv instruction */
|
|
"issue_scv: "
|
|
/* The scv instruction requires a new stack frame */
|
|
" stdu 1,-80(1)\n"
|
|
" std 27,40(1)\n" /* save r27 to stack frame */
|
|
" mflr 27\n" /* Get link register */
|
|
" std 27,16(1)\n" /* Save link register */
|
|
|
|
/* setup and issue the scv instruction */
|
|
" 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 */
|
|
|
|
" .machine push\n"
|
|
" .machine \"power9\"\n"
|
|
" scv 0\n"
|
|
" .machine pop\n"
|
|
" ld 5,-16(1)\n" /* reacquire argblock ptr (r5 is caller-save) */
|
|
" std 3,0(5)\n" /* argblock[0] = r3 */
|
|
|
|
/* pop off stack frame */
|
|
" ld 27,16(1)\n" /* Fetch LR from frame */
|
|
" mtlr 27\n" /* restore LR */
|
|
" ld 27,40(1)\n" /* restore r27 from stack frame */
|
|
" addi 1,1,80\n"
|
|
" blr\n"
|
|
" .size do_syscall_WRK, .-do_syscall_WRK\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"
|
|
".globl do_syscall_WRK\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_arm64_linux)
|
|
/* I think the conventions are:
|
|
args in r0 r1 r2 r3 r4 r5
|
|
sysno in r8
|
|
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.
|
|
|
|
r0 to r5 remain unchanged, but syscall_no is in r6 and needs
|
|
to be moved to r8 (??)
|
|
*/
|
|
extern UWord do_syscall_WRK (
|
|
UWord a1, UWord a2, UWord a3,
|
|
UWord a4, UWord a5, UWord a6,
|
|
UWord syscall_no
|
|
);
|
|
asm(
|
|
".text\n"
|
|
".globl do_syscall_WRK\n"
|
|
"do_syscall_WRK:\n"
|
|
" mov x8, x6\n"
|
|
" mov x6, 0\n"
|
|
" mov x7, 0\n"
|
|
" svc 0\n"
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#elif defined(VGP_x86_freebsd)
|
|
/* Incoming args (syscall number + up to 8 args) are on the stack.
|
|
FreeBSD has a syscall called 'syscall' that takes all args (including
|
|
the syscall number) off the stack. Since we're called, the return
|
|
address is on the stack as expected, so we can just call syscall(2)
|
|
and it Just Works. Error is when carry is set.
|
|
*/
|
|
extern ULong do_syscall_WRK (
|
|
UWord syscall_no,
|
|
UWord a1, UWord a2, UWord a3,
|
|
UWord a4, UWord a5, UWord a6,
|
|
UWord a7, UWord a8, UInt *flags
|
|
);
|
|
asm(
|
|
".text\n"
|
|
"do_syscall_WRK:\n"
|
|
" movl $0,%eax\n" /* syscall number = "syscall" (0) to avoid stack frobbing
|
|
*/
|
|
" int $0x80\n"
|
|
" jb 1f\n"
|
|
" ret\n"
|
|
"1: movl 40(%esp),%ecx\n" /* store carry in *flags */
|
|
" movl $1,(%ecx)\n"
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#elif defined(VGP_amd64_freebsd)
|
|
/* Convert function calling convention --> SYSCALL_STD calling
|
|
convention.
|
|
Last stack arguments need to be pushed first, hence
|
|
a8 is pushed before a7.
|
|
*/
|
|
extern UWord do_syscall_WRK (
|
|
UWord syscall_no, /* %rdi */
|
|
UWord a1, /* %rsi */
|
|
UWord a2, /* %rdx */
|
|
UWord a3, /* %rcx */
|
|
UWord a4, /* %r8 */
|
|
UWord a5, /* %r9 */
|
|
UWord a6, /* 8(%rsp) */
|
|
UWord a7, /* 16(%rsp) */
|
|
UInt *flags, /* 24(%rsp) */
|
|
UWord *rv2 /* 32(%rsp) */
|
|
);
|
|
asm(
|
|
".text\n"
|
|
"do_syscall_WRK:\n"
|
|
" pushq %rbp\n"
|
|
" movq %rsp, %rbp\n"
|
|
" movq %rdi, %rax\n" /* syscall_no */
|
|
" movq %rsi, %rdi\n" /* a1 */
|
|
" movq %rdx, %rsi\n" /* a2 */
|
|
" movq %rcx, %rdx\n" /* a3 */
|
|
" movq %r8, %r10\n" /* a4 */
|
|
" movq %r9, %r8\n" /* a5 */
|
|
" movq 16(%rbp), %r9\n" /* a6 last register arg from stack, account for %rbp */
|
|
" movq 24(%rbp), %r11\n" /* a7 from stack */
|
|
" pushq %r11\n"
|
|
" subq $8,%rsp\n" /* fake return addr */
|
|
" syscall\n"
|
|
" jb 1f\n"
|
|
" movq 40(%rbp),%rsi\n" /* success */
|
|
" movq %rdx, (%rsi)\n" /* second return value */
|
|
" movq %rbp, %rsp\n"
|
|
" popq %rbp\n"
|
|
" ret\n"
|
|
"1:\n" /* error path */
|
|
" movq 32(%rbp), %rsi\n" /* flags */
|
|
" movl $1,(%rsi)\n"
|
|
" movq %rbp, %rsp\n"
|
|
" popq %rbp\n"
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#elif defined(VGP_arm64_freebsd)
|
|
|
|
/*
|
|
* Arguments a1 to a7 are in registers x0 to x6.
|
|
* Which is just what we want for a syscall.
|
|
*
|
|
* The syscall number is in x9
|
|
* The flags are at the top of the stack, sp and
|
|
* second return value at sp+8.
|
|
*/
|
|
|
|
extern UWord do_syscall_WRK (
|
|
UWord a1, UWord a2, UWord a3,
|
|
UWord a4, UWord a5, UWord a6,
|
|
UWord a7, UWord syscall_no,
|
|
UInt *flags, UWord *rv2
|
|
);
|
|
asm(
|
|
".text\n"
|
|
".globl do_syscall_WRK\n"
|
|
"do_syscall_WRK:\n"
|
|
" mov x8, x9\n" // get the syscall number from x9
|
|
" svc 0x0\n" // do the syscall
|
|
" mov x9, 1\n" // flags for error will be 1 or 0
|
|
" csel x9, x9, xzr, cs\n" // conditionally select 1 or 0 into x9
|
|
" ldr x10, [sp]\n" // load the address of flags
|
|
" str w9, [x10]\n" // store flags result
|
|
" ldr x10, [sp, #8]\n" // load the addres of rv2
|
|
" str x1, [x10]\n" // store rv2 result
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#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);
|
|
}
|
|
|
|
#elif defined(VGP_mips32_linux)
|
|
/* Incoming args (syscall number + up to 6 args) come in a0 - a3 and stack.
|
|
|
|
The syscall number goes in v0. The args are passed to the syscall in
|
|
the regs a0 - a3 and stack, i.e. the kernel's syscall calling convention.
|
|
|
|
(a3 != 0) flags an error.
|
|
We return the syscall return value in v0.
|
|
MIPS version
|
|
*/
|
|
extern int do_syscall_WRK (
|
|
int a1, int a2, int a3,
|
|
int a4, int a5, int a6, int a7, int syscall_no, UWord *err,
|
|
UWord *valHi, UWord* valLo
|
|
);
|
|
asm (
|
|
".text \n\t"
|
|
".globl do_syscall_WRK \n\t"
|
|
".type do_syscall_WRK, @function \n\t"
|
|
".set push \n\t"
|
|
".set noreorder \n\t"
|
|
"do_syscall_WRK: \n\t"
|
|
" lw $2, 28($29) \n\t"
|
|
" syscall \n\t"
|
|
" lw $8, 32($29) \n\t"
|
|
" sw $7, ($8) \n\t"
|
|
" lw $8, 36($29) \n\t"
|
|
" sw $3, ($8) \n\t" /* store valHi */
|
|
" lw $8, 40($29) \n\t"
|
|
" jr $31 \n\t"
|
|
" sw $2, ($8) \n\t" /* store valLo */
|
|
".size do_syscall_WRK, .-do_syscall_WRK \n\t"
|
|
".set pop \n\t"
|
|
".previous \n\t"
|
|
);
|
|
|
|
#elif defined(VGP_mips64_linux)
|
|
extern RegWord do_syscall_WRK ( RegWord a1, RegWord a2, RegWord a3, RegWord a4,
|
|
RegWord a5, RegWord a6, RegWord a7, RegWord syscall_no,
|
|
RegWord* V1_A3_val );
|
|
asm (
|
|
".text \n\t"
|
|
".globl do_syscall_WRK \n\t"
|
|
".type do_syscall_WRK, @function \n\t"
|
|
".set push \n\t"
|
|
".set noreorder \n\t"
|
|
"do_syscall_WRK: \n\t"
|
|
" move $2, $11 \n\t"
|
|
" syscall \n\t"
|
|
# if defined(_ABI64)
|
|
" ld $12, 0($29) \n\t"
|
|
# elif defined(_ABIN32)
|
|
" lw $12, 0($29) \n\t"
|
|
# endif
|
|
" sd $3, 0($12) \n\t" /* store v1 in V1_A3_val */
|
|
" jr $31 \n\t"
|
|
" sd $7, 8($12) \n\t" /* store a3 in V1_A3_val */
|
|
".size do_syscall_WRK, .-do_syscall_WRK \n\t"
|
|
".set pop \n\t"
|
|
".previous \n\t"
|
|
);
|
|
|
|
#elif defined(VGP_nanomips_linux)
|
|
extern void do_syscall_WRK (
|
|
RegWord a1, RegWord a2, RegWord a3,
|
|
RegWord a4, RegWord a5, RegWord a6,
|
|
RegWord syscall_no, RegWord *res_a0);
|
|
asm (
|
|
".text \n\t"
|
|
".globl do_syscall_WRK \n\t"
|
|
".type do_syscall_WRK, @function \n\t"
|
|
".set push \n\t"
|
|
".set noreorder \n\t"
|
|
"do_syscall_WRK: \n\t"
|
|
" save 32, $a7 \n\t"
|
|
" move $t4, $a6 \n\t"
|
|
" syscall[32] \n\t"
|
|
" restore 32, $a7 \n\t"
|
|
" sw $a0, 0($a7) \n\t"
|
|
" jrc $ra \n\t"
|
|
".size do_syscall_WRK, .-do_syscall_WRK \n\t"
|
|
".set pop \n\t"
|
|
".previous \n\t"
|
|
);
|
|
|
|
#elif defined(VGP_riscv64_linux)
|
|
/* Calling convention is: args in a0-a5, sysno in a7, return value in a0.
|
|
Return value follows the usual convention that -4095 .. -1 (both inclusive)
|
|
is an error value. All other values are success values.
|
|
|
|
Registers a0 to a5 remain unchanged, but syscall_no is in a6 and needs to be
|
|
moved to a7.
|
|
*/
|
|
extern UWord do_syscall_WRK (
|
|
UWord a1, UWord a2, UWord a3,
|
|
UWord a4, UWord a5, UWord a6,
|
|
UWord syscall_no
|
|
);
|
|
asm(
|
|
".text\n"
|
|
".globl do_syscall_WRK\n"
|
|
"do_syscall_WRK:\n"
|
|
" mv a7, a6\n"
|
|
" li a6, 0\n"
|
|
" ecall\n"
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#elif defined(VGP_x86_solaris)
|
|
|
|
extern ULong
|
|
do_syscall_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) */
|
|
/* Classic unix syscall.. parameters on the stack, an unused (by the kernel)
|
|
return address at 0(esp), a sysno in eax, a result in edx:eax, the carry
|
|
flag set on error. */
|
|
__asm__ (
|
|
".text\n"
|
|
".globl do_syscall_WRK\n"
|
|
"do_syscall_WRK:\n"
|
|
" movl 40(%esp), %ecx\n" /* assume syscall success */
|
|
" movl $0, (%ecx)\n"
|
|
" movl 36(%esp), %eax\n"
|
|
" int $0x91\n"
|
|
" jnc 1f\n" /* jump if success */
|
|
" movl 40(%esp), %ecx\n" /* syscall failed - set *errflag */
|
|
" movl $1, (%ecx)\n"
|
|
"1: ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
extern ULong
|
|
do_syscall_fast_WRK(UWord syscall_no); /* 4(esp) */
|
|
/* Fasttrap syscall.. no parameters, a sysno in eax, a result in edx:eax,
|
|
never fails (if the sysno is valid). */
|
|
__asm__ (
|
|
".text\n"
|
|
".globl do_syscall_fast_WRK\n"
|
|
"do_syscall_fast_WRK:\n"
|
|
" movl 4(%esp), %eax\n"
|
|
" int $0xD2\n"
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#elif defined(VGP_amd64_solaris)
|
|
|
|
extern ULong
|
|
do_syscall_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) */
|
|
/* First 6 parameters in registers rdi, rsi, rdx, r10, r8, r9, next
|
|
2 parameters on the stack, an unused (by the kernel) return address at
|
|
0(rsp), a sysno in rax, a result in rdx:rax, the carry flag set on
|
|
error. */
|
|
__asm__ (
|
|
".text\n"
|
|
".globl do_syscall_WRK\n"
|
|
"do_syscall_WRK:\n"
|
|
" movq %rcx, %r10\n" /* pass rcx in r10 instead */
|
|
" movq 32(%rsp), %rcx\n" /* assume syscall success */
|
|
" movq $0, (%rcx)\n"
|
|
" movq 24(%rsp), %rax\n"
|
|
" 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"
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
extern ULong
|
|
do_syscall_fast_WRK(UWord syscall_no, /* rdi */
|
|
/*OUT*/ULong *res2); /* rsi */
|
|
/* Fasttrap syscall.. no parameters, a sysno in rax, a result in rdx:rax,
|
|
never fails (if the sysno is valid). */
|
|
__asm__ (
|
|
".text\n"
|
|
".globl do_syscall_fast_WRK\n"
|
|
"do_syscall_fast_WRK:\n"
|
|
" movq %rdi, %rax\n"
|
|
" int $0xD2\n"
|
|
" movq %rdx, (%rsi)\n" /* save 2nd result word */
|
|
" ret\n"
|
|
".previous\n"
|
|
);
|
|
|
|
#else
|
|
# error Unknown platform
|
|
#endif
|
|
|
|
|
|
/* Finally, the generic code. This sends the call to the right
|
|
helper. */
|
|
|
|
SysRes VG_(do_syscall) ( UWord sysno, RegWord a1, RegWord a2, RegWord a3,
|
|
RegWord a4, RegWord a5, RegWord a6,
|
|
RegWord a7, RegWord 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_x86_freebsd)
|
|
ULong val;
|
|
UInt err = 0;
|
|
val = do_syscall_WRK(sysno, a1, a2, a3, a4, a5,
|
|
a6, a7, a8, &err);
|
|
return VG_(mk_SysRes_x86_freebsd)( (UInt)val, (UInt)(val>>32), (err & 1) != 0 ? True : False);
|
|
|
|
# elif defined(VGP_amd64_freebsd)
|
|
UWord val;
|
|
UWord val2 = 0;
|
|
UInt err = 0;
|
|
val = do_syscall_WRK(sysno, a1, a2, a3, a4, a5,
|
|
a6, a7, &err, &val2);
|
|
return VG_(mk_SysRes_amd64_freebsd)( val, val2, (err & 1) != 0 ? True : False);
|
|
|
|
# elif defined(VGP_arm64_freebsd)
|
|
UWord val;
|
|
UWord val2 = 0;
|
|
UInt err = 0;
|
|
val = do_syscall_WRK(a1, a2, a3, a4, a5,
|
|
a6, a7, sysno, &err, &val2);
|
|
return VG_(mk_SysRes_arm64_freebsd)( val, val2, (err & 1) != 0 ? True : False);
|
|
|
|
# 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_ppc64be_linux) || defined(VGP_ppc64le_linux)
|
|
ULong argblock[8];
|
|
/* PPC system calls have at most 6 arguments. The Valgrind infrastructure
|
|
supports 8 system call arguments. Argument 7 is used on PPC LE to pass
|
|
the flag indicating if the sc or scv instruction should be used for the
|
|
system call. */
|
|
argblock[0] = sysno;
|
|
argblock[1] = a1;
|
|
argblock[2] = a2;
|
|
argblock[3] = a3;
|
|
argblock[4] = a4;
|
|
argblock[5] = a5;
|
|
argblock[6] = a6;
|
|
argblock[7] = a7;
|
|
do_syscall_WRK( &argblock[0] );
|
|
return VG_(mk_SysRes_ppc64_linux)( argblock[0], argblock[1], a7 );
|
|
|
|
# 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_arm64_linux)
|
|
UWord val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,sysno);
|
|
return VG_(mk_SysRes_arm64_linux)( val );
|
|
|
|
# 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 );
|
|
|
|
#elif defined(VGP_mips32_linux)
|
|
UWord err = 0;
|
|
UWord valHi = 0;
|
|
UWord valLo = 0;
|
|
(void) do_syscall_WRK(a1, a2, a3, a4, a5, a6, a7, sysno, &err, &valHi, &valLo);
|
|
return VG_(mk_SysRes_mips32_linux)( valLo, valHi, (ULong)err );
|
|
|
|
#elif defined(VGP_mips64_linux)
|
|
RegWord v1_a3[2];
|
|
v1_a3[0] = 0xFF00;
|
|
v1_a3[1] = 0xFF00;
|
|
RegWord V0 = do_syscall_WRK(a1, a2, a3, a4, a5, a6, a7, sysno, v1_a3);
|
|
RegWord V1 = (RegWord)v1_a3[0];
|
|
RegWord A3 = (RegWord)v1_a3[1];
|
|
return VG_(mk_SysRes_mips64_linux)( V0, V1, A3 );
|
|
|
|
#elif defined(VGP_nanomips_linux)
|
|
RegWord reg_a0 = 0;
|
|
do_syscall_WRK(a1, a2, a3, a4, a5, a6, sysno, ®_a0);
|
|
return VG_(mk_SysRes_nanomips_linux)(reg_a0);
|
|
|
|
# elif defined(VGP_riscv64_linux)
|
|
UWord val = do_syscall_WRK(a1, a2, a3, a4, a5, a6, sysno);
|
|
return VG_(mk_SysRes_riscv64_linux)(val);
|
|
|
|
# elif defined(VGP_x86_solaris)
|
|
UInt val, val2, err = False;
|
|
Bool restart;
|
|
ULong u64;
|
|
UChar ssclass = VG_SOLARIS_SYSNO_CLASS(sysno);
|
|
|
|
switch (ssclass) {
|
|
case VG_SOLARIS_SYSCALL_CLASS_CLASSIC:
|
|
/* The Solaris kernel does not restart syscalls automatically so it
|
|
is done here. */
|
|
do {
|
|
u64 = do_syscall_WRK(a1,a2,a3,a4,a5,a6,a7,a8,
|
|
VG_SOLARIS_SYSNO_INDEX(sysno), &err);
|
|
val = (UInt)u64;
|
|
restart = err && (val == VKI_EINTR || val == VKI_ERESTART);
|
|
} while (restart);
|
|
break;
|
|
case VG_SOLARIS_SYSCALL_CLASS_FASTTRAP:
|
|
u64 = do_syscall_fast_WRK(VG_SOLARIS_SYSNO_INDEX(sysno));
|
|
break;
|
|
default:
|
|
vg_assert(0);
|
|
break;
|
|
}
|
|
|
|
val = (UInt)u64;
|
|
val2 = (UInt)(u64 >> 32);
|
|
return VG_(mk_SysRes_x86_solaris)(err ? True : False, val,
|
|
err ? 0 : val2);
|
|
|
|
# elif defined(VGP_amd64_solaris)
|
|
ULong val, val2, err = False;
|
|
Bool restart;
|
|
UChar ssclass = VG_SOLARIS_SYSNO_CLASS(sysno);
|
|
|
|
switch (ssclass) {
|
|
case VG_SOLARIS_SYSCALL_CLASS_CLASSIC:
|
|
/* The Solaris kernel does not restart syscalls automatically so it
|
|
is done here. */
|
|
do {
|
|
val = do_syscall_WRK(a1,a2,a3,a4,a5,a6,a7,a8,
|
|
VG_SOLARIS_SYSNO_INDEX(sysno), &err, &val2);
|
|
restart = err && (val == VKI_EINTR || val == VKI_ERESTART);
|
|
} while (restart);
|
|
break;
|
|
case VG_SOLARIS_SYSCALL_CLASS_FASTTRAP:
|
|
val = do_syscall_fast_WRK(VG_SOLARIS_SYSNO_INDEX(sysno), &val2);
|
|
break;
|
|
default:
|
|
vg_assert(0);
|
|
break;
|
|
}
|
|
|
|
return VG_(mk_SysRes_amd64_solaris)(err ? True : False, val,
|
|
err ? 0 : val2);
|
|
|
|
#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_EIO: return "Input/output error";
|
|
case VKI_ENXIO: return "No such device or address";
|
|
case VKI_E2BIG: return "Argument list too long";
|
|
case VKI_ENOEXEC: return "Exec format error";
|
|
case VKI_EBADF: return "Bad file descriptor";
|
|
case VKI_ECHILD: return "No child processes";
|
|
case VKI_EAGAIN: return "Resource temporarily unavailable";
|
|
case VKI_ENOMEM: return "Cannot allocate memory";
|
|
case VKI_EACCES: return "Permission denied";
|
|
case VKI_EFAULT: return "Bad address";
|
|
case VKI_ENOTBLK: return "Block device required";
|
|
case VKI_EBUSY: return "Device or resource busy";
|
|
case VKI_EEXIST: return "File exists";
|
|
case VKI_EXDEV: return "Invalid cross-device link";
|
|
case VKI_ENODEV: return "No such device";
|
|
case VKI_ENOTDIR: return "Not a directory";
|
|
case VKI_EISDIR: return "Is a directory";
|
|
case VKI_EINVAL: return "Invalid argument";
|
|
case VKI_ENFILE: return "Too many open files in system";
|
|
case VKI_EMFILE: return "Too many open files";
|
|
case VKI_ENOTTY: return "Inappropriate ioctl for device";
|
|
case VKI_ETXTBSY: return "Text file busy";
|
|
case VKI_EFBIG: return "File too large";
|
|
case VKI_ENOSPC: return "No space left on device";
|
|
case VKI_ESPIPE: return "Illegal seek";
|
|
case VKI_EROFS: return "Read-only file system";
|
|
case VKI_EMLINK: return "Too many links";
|
|
case VKI_EPIPE: return "Broken pipe";
|
|
case VKI_EDOM: return "Numerical argument out of domain";
|
|
case VKI_ERANGE: return "Numerical result out of range";
|
|
|
|
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
|
|
# if defined(VKI_ERESTART)
|
|
case VKI_ERESTART: return "ERESTART";
|
|
# endif
|
|
default: return "VG_(strerror): unknown error";
|
|
}
|
|
}
|
|
|
|
|
|
/*--------------------------------------------------------------------*/
|
|
/*--- end ---*/
|
|
/*--------------------------------------------------------------------*/
|