September 2017 - devel

[PATCH] recvmmsg/sendmmsg: add recvmmsg sendmmsg support.
by Guo Ren 03 Oct '17

03 Oct '17

The recvmmsg and sendmmsg is very important for UDP stream application. If we only use recvmsg for UDP stream, it will only copy one mtu size of data in a syscall. And recvmmsg copy as many as you want in a syscall. So recvmmsg is more efficient,and some applications will depends on the recvmmsg and sendmmsg, eg: UDP media stream player. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- include/sys/socket.h | 30 ++++++++++++++++++++++++++++ libc/inet/Makefile.in | 3 ++- libc/inet/recvmmsg.c | 8 ++++++++ libc/inet/sendmmsg.c | 8 ++++++++ libc/inet/socketcalls.c | 48 +++++++++++++++++++++++++++++++++++++++++++++ libpthread/nptl/Makefile.in | 2 ++ 6 files changed, 98 insertions(+), 1 deletion(-) create mode 100644 libc/inet/recvmmsg.c create mode 100644 libc/inet/sendmmsg.c diff --git a/include/sys/socket.h b/include/sys/socket.h index 8642312..63dc4b9 100644 --- a/include/sys/socket.h +++ b/include/sys/socket.h @@ -97,6 +97,15 @@ typedef union { __SOCKADDR_ALLTYPES # undef __SOCKADDR_ONETYPE #endif +#ifdef __USE_GNU +/* For `recvmmsg' and `sendmmsg'. */ +struct mmsghdr + { + struct msghdr msg_hdr; /* Actual message header. */ + unsigned int msg_len; /* Number of received or sent bytes for the + entry. */ + }; +#endif /* Create a new socket of type TYPE in domain DOMAIN, using protocol PROTOCOL. If PROTOCOL is zero, one is chosen automatically. @@ -190,6 +199,17 @@ extern ssize_t sendmsg (int __fd, const struct msghdr *__message, int __flags); libc_hidden_proto(sendmsg) +#ifdef __USE_GNU +/* Send a VLEN messages as described by VMESSAGES to socket FD. + Returns the number of datagrams successfully written or -1 for errors. + + This function is a cancellation point and therefore not marked with + __THROW. */ +extern ssize_t sendmmsg (int __fd, struct mmsghdr *__vmessages, + size_t __vlen, int __flags); +libc_hidden_proto(sendmmsg) +#endif + /* Receive a message as described by MESSAGE from socket FD. Returns the number of bytes read or -1 for errors. @@ -198,6 +218,16 @@ libc_hidden_proto(sendmsg) extern ssize_t recvmsg (int __fd, struct msghdr *__message, int __flags); libc_hidden_proto(recvmsg) +#ifdef __USE_GNU +/* Receive up to VLEN messages as described by VMESSAGES from socket FD. + Returns the number of messages received or -1 for errors. + + This function is a cancellation point and therefore not marked with + __THROW. */ +extern ssize_t recvmmsg (int __fd, struct mmsghdr *__vmessages, + size_t vlen, int __flags, struct timespec *__tmo); +libc_hidden_proto(recvmmsg) +#endif /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's diff --git a/libc/inet/Makefile.in b/libc/inet/Makefile.in index 332e70e..bed76c3 100644 --- a/libc/inet/Makefile.in +++ b/libc/inet/Makefile.in @@ -47,7 +47,8 @@ CSRC-$(UCLIBC_HAS_RESOLVER_SUPPORT) += \ socketcalls_CSRC-y += \ accept.c bind.c connect.c getpeername.c getsockname.c \ getsockopt.c listen.c recv.c recvfrom.c recvmsg.c send.c sendmsg.c \ - sendto.c setsockopt.c shutdown.c socket.c socketpair.c + sendto.c setsockopt.c shutdown.c socket.c socketpair.c \ + recvmmsg.c sendmmsg.c socketcalls_CSRC-$(UCLIBC_LINUX_SPECIFIC) += accept4.c CSRC-$(UCLIBC_HAS_SOCKET) += $(socketcalls_CSRC-y) opensock.c diff --git a/libc/inet/recvmmsg.c b/libc/inet/recvmmsg.c new file mode 100644 index 0000000..003b5a6 --- /dev/null +++ b/libc/inet/recvmmsg.c @@ -0,0 +1,8 @@ +/* + * Copyright (C) 2000-2006 Erik Andersen <andersen(a)uclibc.org> + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#define L_recvmmsg +#include "socketcalls.c" diff --git a/libc/inet/sendmmsg.c b/libc/inet/sendmmsg.c new file mode 100644 index 0000000..f1557fe --- /dev/null +++ b/libc/inet/sendmmsg.c @@ -0,0 +1,8 @@ +/* + * Copyright (C) 2000-2006 Erik Andersen <andersen(a)uclibc.org> + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#define L_sendmmsg +#include "socketcalls.c" diff --git a/libc/inet/socketcalls.c b/libc/inet/socketcalls.c index 1fef810..cb28140 100644 --- a/libc/inet/socketcalls.c +++ b/libc/inet/socketcalls.c @@ -29,6 +29,8 @@ #define SYS_SENDMSG 16 #define SYS_RECVMSG 17 #define SYS_ACCEPT4 18 +#define SYS_RECVMMSG 19 +#define SYS_SENDMMSG 20 #endif /* exposed on x86 since Linux commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb */ @@ -283,6 +285,30 @@ CANCELLABLE_SYSCALL(ssize_t, recvmsg, (int sockfd, struct msghdr *msg, int flags lt_libc_hidden(recvmsg) #endif +#ifdef L_recvmmsg +static ssize_t __NC(recvmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen, + int flags, struct timespec *tmo) +{ +# ifdef __NR_recvmmsg + return (ssize_t)INLINE_SYSCALL(recvmmsg, 5, sockfd, msg, vlen, flags, tmo); +# else + unsigned long args[5]; + + args[0] = sockfd; + args[1] = (unsigned long) msg; + args[2] = vlen; + args[3] = flags; + args[4] = (unsigned long) tmo; + return (ssize_t)__socketcall(SYS_RECVMMSG, args); +# endif +} +CANCELLABLE_SYSCALL(ssize_t, recvmmsg, + (int sockfd, struct mmsghdr *msg, size_t vlen, int flags, + struct timespec *tmo), + (sockfd, msg, vlen, flags, tmo)) +lt_libc_hidden(recvmmsg) +#endif + #ifdef L_send static ssize_t __NC(send)(int sockfd, const void *buffer, size_t len, int flags) { @@ -324,6 +350,28 @@ CANCELLABLE_SYSCALL(ssize_t, sendmsg, (int sockfd, const struct msghdr *msg, int lt_libc_hidden(sendmsg) #endif +#ifdef L_sendmmsg +static ssize_t __NC(sendmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen, + int flags) +{ +# ifdef __NR_sendmmsg + return (ssize_t)INLINE_SYSCALL(sendmmsg, 4, sockfd, msg, vlen, flags); +# else + unsigned long args[4]; + + args[0] = sockfd; + args[1] = (unsigned long) msg; + args[2] = vlen; + args[3] = flags; + return (ssize_t)__socketcall(SYS_SENDMMSG, args); +# endif +} +CANCELLABLE_SYSCALL(ssize_t, sendmmsg, + (int sockfd, struct mmsghdr *msg, size_t vlen, int flags), + (sockfd, msg, vlen, flags)) +lt_libc_hidden(sendmmsg) +#endif + #ifdef L_sendto ssize_t __NC(sendto)(int sockfd, const void *buffer, size_t len, int flags, const struct sockaddr *to, socklen_t tolen) diff --git a/libpthread/nptl/Makefile.in b/libpthread/nptl/Makefile.in index 068eee4..a2f30ac 100644 --- a/libpthread/nptl/Makefile.in +++ b/libpthread/nptl/Makefile.in @@ -166,11 +166,13 @@ CFLAGS-readv.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-recv.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-recvfrom.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-recvmsg.c = -fexceptions -fasynchronous-unwind-tables +CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-__rt_sigtimedwait.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-__rt_sigwaitinfo.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-select.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-send.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sendmsg.c = -fexceptions -fasynchronous-unwind-tables +CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sendto.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sigpause.c = -fexceptions CFLAGS-sigsuspend.c = -fexceptions -fasynchronous-unwind-tables -- 2.7.4

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[PATCH] GCC libgo compilation error
by Alex Potapenko 29 Sep '17

29 Sep '17

Hi all, I'm facing a compilation error while building GCC 7.2.0 libgo with uClibc-ng 1.0.26 with this error: runtime_sysinfo.go:418:17: error: use of undefined type ‘___uclibc_locale_struct’ Here is the relevant build output: https://pastebin.com/B7urxS2m The problematic runtime_sysinfo.go is created using -fdump-go-spec: it's used to automatically generate Go declarations from C code (see https://golang.org/doc/install/gccgo#Automatic_generation_of_Go_declaration…) The generated gen-sysinfo.go is indeed missing ___uclibc_locale_struct declaration. Looks like -fdump-go-spec generates types only from typedef declarations, ignoring structs, like "struct __uclibc_locale_struct;" in uClibc_locale.h. This simple change allows to build libgo fine: --- uClibc_locale.h.orig 2017-09-25 19:49:38.000000000 +0000 +++ uClibc_locale.h 2017-09-28 07:27:14.035517712 +0000 @@ -73,6 +73,7 @@ */ struct __uclibc_locale_struct; +typedef struct __uclibc_locale_struct __uclibc_locale_struct; typedef struct __uclibc_locale_struct *__locale_t; #endif /* !defined(__LOCALE_C_ONLY) */ Does this change look sane? Or should I patch GCC libgo/sysinfo.c instead to add "typedef struct __uclibc_locale_struct __uclibc_locale_struct;" there? Thanks, Alex

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[PATCH] recvmmsg/sendmmsg: add recvmmsg sendmmsg support.
by Guo Ren 26 Sep '17

26 Sep '17

The recvmmsg and sendmmsg is very important for UDP stream application. If we only use recvmsg for UDP stream, it will only copy one mtu size of data in a syscall. And recvmmsg copy as many as you want in a syscall. So recvmmsg is more efficient,and some applications will depends on the recvmmsg and sendmmsg, eg: UDP media stream player. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- include/sys/socket.h | 30 ++++++++++++++++++++++++++++ libc/inet/Makefile.in | 3 ++- libc/inet/recvmmsg.c | 8 ++++++++ libc/inet/sendmmsg.c | 8 ++++++++ libc/inet/socketcalls.c | 48 +++++++++++++++++++++++++++++++++++++++++++++ libpthread/nptl/Makefile.in | 2 ++ 6 files changed, 98 insertions(+), 1 deletion(-) create mode 100644 libc/inet/recvmmsg.c create mode 100644 libc/inet/sendmmsg.c diff --git a/include/sys/socket.h b/include/sys/socket.h index 8642312..63dc4b9 100644 --- a/include/sys/socket.h +++ b/include/sys/socket.h @@ -97,6 +97,15 @@ typedef union { __SOCKADDR_ALLTYPES # undef __SOCKADDR_ONETYPE #endif +#ifdef __USE_GNU +/* For `recvmmsg' and `sendmmsg'. */ +struct mmsghdr + { + struct msghdr msg_hdr; /* Actual message header. */ + unsigned int msg_len; /* Number of received or sent bytes for the + entry. */ + }; +#endif /* Create a new socket of type TYPE in domain DOMAIN, using protocol PROTOCOL. If PROTOCOL is zero, one is chosen automatically. @@ -190,6 +199,17 @@ extern ssize_t sendmsg (int __fd, const struct msghdr *__message, int __flags); libc_hidden_proto(sendmsg) +#ifdef __USE_GNU +/* Send a VLEN messages as described by VMESSAGES to socket FD. + Returns the number of datagrams successfully written or -1 for errors. + + This function is a cancellation point and therefore not marked with + __THROW. */ +extern ssize_t sendmmsg (int __fd, struct mmsghdr *__vmessages, + size_t __vlen, int __flags); +libc_hidden_proto(sendmmsg) +#endif + /* Receive a message as described by MESSAGE from socket FD. Returns the number of bytes read or -1 for errors. @@ -198,6 +218,16 @@ libc_hidden_proto(sendmsg) extern ssize_t recvmsg (int __fd, struct msghdr *__message, int __flags); libc_hidden_proto(recvmsg) +#ifdef __USE_GNU +/* Receive up to VLEN messages as described by VMESSAGES from socket FD. + Returns the number of messages received or -1 for errors. + + This function is a cancellation point and therefore not marked with + __THROW. */ +extern ssize_t recvmmsg (int __fd, struct mmsghdr *__vmessages, + size_t vlen, int __flags, struct timespec *__tmo); +libc_hidden_proto(recvmmsg) +#endif /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's diff --git a/libc/inet/Makefile.in b/libc/inet/Makefile.in index 332e70e..bed76c3 100644 --- a/libc/inet/Makefile.in +++ b/libc/inet/Makefile.in @@ -47,7 +47,8 @@ CSRC-$(UCLIBC_HAS_RESOLVER_SUPPORT) += \ socketcalls_CSRC-y += \ accept.c bind.c connect.c getpeername.c getsockname.c \ getsockopt.c listen.c recv.c recvfrom.c recvmsg.c send.c sendmsg.c \ - sendto.c setsockopt.c shutdown.c socket.c socketpair.c + sendto.c setsockopt.c shutdown.c socket.c socketpair.c \ + recvmmsg.c sendmmsg.c socketcalls_CSRC-$(UCLIBC_LINUX_SPECIFIC) += accept4.c CSRC-$(UCLIBC_HAS_SOCKET) += $(socketcalls_CSRC-y) opensock.c diff --git a/libc/inet/recvmmsg.c b/libc/inet/recvmmsg.c new file mode 100644 index 0000000..003b5a6 --- /dev/null +++ b/libc/inet/recvmmsg.c @@ -0,0 +1,8 @@ +/* + * Copyright (C) 2000-2006 Erik Andersen <andersen(a)uclibc.org> + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#define L_recvmmsg +#include "socketcalls.c" diff --git a/libc/inet/sendmmsg.c b/libc/inet/sendmmsg.c new file mode 100644 index 0000000..f1557fe --- /dev/null +++ b/libc/inet/sendmmsg.c @@ -0,0 +1,8 @@ +/* + * Copyright (C) 2000-2006 Erik Andersen <andersen(a)uclibc.org> + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#define L_sendmmsg +#include "socketcalls.c" diff --git a/libc/inet/socketcalls.c b/libc/inet/socketcalls.c index 1fef810..83bad12 100644 --- a/libc/inet/socketcalls.c +++ b/libc/inet/socketcalls.c @@ -29,6 +29,8 @@ #define SYS_SENDMSG 16 #define SYS_RECVMSG 17 #define SYS_ACCEPT4 18 +#define SYS_RECVMMSG 19 +#define SYS_SENDMMSG 20 #endif /* exposed on x86 since Linux commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb */ @@ -283,6 +285,30 @@ CANCELLABLE_SYSCALL(ssize_t, recvmsg, (int sockfd, struct msghdr *msg, int flags lt_libc_hidden(recvmsg) #endif +#ifdef L_recvmmsg +static ssize_t __NC(recvmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen, + int flags, struct timespec *tmo) +{ +# ifdef __NR_recvmmsg + return (ssize_t)INLINE_SYSCALL(recvmmsg, 5, sockfd, msg, vlen, flags, tmo); +# else + unsigned long args[5]; + + args[0] = sockfd; + args[1] = (unsigned long) msg; + args[2] = vlen; + args[3] = flags; + args[4] = (unsigned long) tmo; + return (ssize_t)__socketcall(SYS_RECVMMSG, args); +# endif +} +CANCELLABLE_SYSCALL(ssize_t, recvmmsg, + (int sockfd, struct mmsghdr *msg, size_t vlen, int flags, + struct timespec *tmo), + (sockfd, msg, vlen, flags, tmo)) +lt_libc_hidden(recvmmsg) +#endif + #ifdef L_send static ssize_t __NC(send)(int sockfd, const void *buffer, size_t len, int flags) { @@ -324,6 +350,28 @@ CANCELLABLE_SYSCALL(ssize_t, sendmsg, (int sockfd, const struct msghdr *msg, int lt_libc_hidden(sendmsg) #endif +#ifdef L_sendmmsg +static ssize_t __NC(sendmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen, + int flags) +{ +# ifdef __NR_sendmmsg + return (ssize_t)INLINE_SYSCALL(recvmmsg, 4, sockfd, msg, vlen, flags); +# else + unsigned long args[4]; + + args[0] = sockfd; + args[1] = (unsigned long) msg; + args[2] = vlen; + args[3] = flags; + return (ssize_t)__socketcall(SYS_SENDMMSG, args); +# endif +} +CANCELLABLE_SYSCALL(ssize_t, sendmmsg, + (int sockfd, struct mmsghdr *msg, size_t vlen, int flags), + (sockfd, msg, vlen, flags)) +lt_libc_hidden(sendmmsg) +#endif + #ifdef L_sendto ssize_t __NC(sendto)(int sockfd, const void *buffer, size_t len, int flags, const struct sockaddr *to, socklen_t tolen) diff --git a/libpthread/nptl/Makefile.in b/libpthread/nptl/Makefile.in index 068eee4..a2f30ac 100644 --- a/libpthread/nptl/Makefile.in +++ b/libpthread/nptl/Makefile.in @@ -166,11 +166,13 @@ CFLAGS-readv.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-recv.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-recvfrom.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-recvmsg.c = -fexceptions -fasynchronous-unwind-tables +CFLAGS-recvmmsg.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-__rt_sigtimedwait.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-__rt_sigwaitinfo.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-select.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-send.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sendmsg.c = -fexceptions -fasynchronous-unwind-tables +CFLAGS-sendmmsg.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sendto.c = -fexceptions -fasynchronous-unwind-tables CFLAGS-sigpause.c = -fexceptions CFLAGS-sigsuspend.c = -fexceptions -fasynchronous-unwind-tables -- 2.7.4

1 0

[PATCH 1/1] statfs: bugfix statfs02 fstatfs02 failed in ltp-testsuite.
by Guo Ren 25 Sep '17

25 Sep '17

In the test-case of statfs from ltp-testsuite, it pass -1 to 2th argument. eg: fstatfs(fd , -1) When uclibc-ng parse the buf32 to buf will cause illegal address access, the kernel will signal the process with SIGSEV. If we pass the -1 directly to the syscall of statfs/fstatfs, kenrel use copy_to_user() to prevent the singal of SIGSEV and just return EVINAL. This is the ltp-testsuite expect. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/misc/statfs/fstatfs64.c | 4 +++- libc/misc/statfs/statfs64.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/libc/misc/statfs/fstatfs64.c b/libc/misc/statfs/fstatfs64.c index 7221a0b..bb9ca30 100644 --- a/libc/misc/statfs/fstatfs64.c +++ b/libc/misc/statfs/fstatfs64.c @@ -33,9 +33,11 @@ int fstatfs64 (int fd, struct statfs64 *buf) { struct statfs buf32; - if (__libc_fstatfs (fd, &buf32) < 0) + if (__libc_fstatfs (fd, (struct statfs *)buf) < 0) return -1; + buf32 = *(struct statfs *)buf; + buf->f_type = buf32.f_type; buf->f_bsize = buf32.f_bsize; buf->f_blocks = buf32.f_blocks; diff --git a/libc/misc/statfs/statfs64.c b/libc/misc/statfs/statfs64.c index b1a33b7..7317870 100644 --- a/libc/misc/statfs/statfs64.c +++ b/libc/misc/statfs/statfs64.c @@ -31,9 +31,11 @@ int statfs64 (const char *file, struct statfs64 *buf) { struct statfs buf32; - if (__libc_statfs (file, &buf32) < 0) + if (__libc_statfs (file, (struct statfs *)buf) < 0) return -1; + buf32 = *(struct statfs *)buf; + buf->f_type = buf32.f_type; buf->f_bsize = buf32.f_bsize; buf->f_blocks = buf32.f_blocks; -- 2.7.4

1 0

[PATCH 1/1] preadv/pwritev: bugfix preadv/pwritev syscall should be 5 args
by Guo Ren 25 Sep '17

25 Sep '17

The current uclibc-ng use 4 arguments, and this will cause ltp-testsuite's preadv/pwritev case failed. The syscall of preadv/pwritev in current linux-kernel is 5 arguments: linux/fs/read_write.c: SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) So just update to 5-args-syscall, and off_t could be 32bit or 64bit. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/sysdeps/linux/common/preadv.c | 7 ++++++- libc/sysdeps/linux/common/pwritev.c | 7 ++++++- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/libc/sysdeps/linux/common/preadv.c b/libc/sysdeps/linux/common/preadv.c index b90291b..fd9dde4 100644 --- a/libc/sysdeps/linux/common/preadv.c +++ b/libc/sysdeps/linux/common/preadv.c @@ -23,6 +23,11 @@ ssize_t preadv (int fd, const struct iovec *vector, int count, off_t offset) { - return INLINE_SYSCALL (preadv, 4, fd, vector, count, offset); + unsigned long pos_l, pos_h; + + pos_h = (unsigned long)((long long)offset >> 32); + pos_l = (unsigned long)((long long)offset); + + return INLINE_SYSCALL (preadv, 5, fd, vector, count, pos_l, pos_h); } #endif diff --git a/libc/sysdeps/linux/common/pwritev.c b/libc/sysdeps/linux/common/pwritev.c index a1880ed..bef5bcf 100644 --- a/libc/sysdeps/linux/common/pwritev.c +++ b/libc/sysdeps/linux/common/pwritev.c @@ -23,6 +23,11 @@ ssize_t pwritev (int fd, const struct iovec *vector, int count, off_t offset) { - return INLINE_SYSCALL (pwritev, 4, fd, vector, count, offset); + unsigned long pos_l, pos_h; + + pos_h = (unsigned long)((long long)offset >> 32); + pos_l = (unsigned long)((long long)offset); + + return INLINE_SYSCALL (pwritev, 5, fd, vector, count, pos_l, pos_h); } #endif -- 2.7.4

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[PATCH] arc: Ensure that debugger can recognize sigrestorer
by Anton Kolesov 14 Sep '17

14 Sep '17

An issue has been found with current implementation of ARC signal restorer function in uClibc and how GDB handles it. When debugger information is not present, everything worked fine, because GDB would use a built-in logic to determine if function is a signal restorer. However when debugging information is present, debugger would rely solely on it and wouldn't use ARC-specific functions to detect signal handler frames. Because debug information for signal restorer is generated completely by the compiler, it lacks a marker, that identifies this as a signal frame that requires special handling. While it is possible to insert that marker via inline assembly, that still doesn't solve the whole problem, because some other expectations are not met by the debug information - there is no "nop" in front of the function, needed to fool debugger into thinking that this was a function call, and references to previous frame information need to be described manually. The simplest way to fix the problem is just to make sure that signal restorer function will not have any debug function at all, which can be done by writing it in assembly. Alternative, more complex solution, where debug information for signal frame is manually defined can be found in glibc/sysdeps/unix/sysv/linux/x86_64/sigaction.c [1]. [1] https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x8… Signed-off-by: Anton Kolesov <Anton.Kolesov(a)synopsys.com> Anton

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