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b8a7c7da4e
glibc/sysdeps/unix
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Adhemerval Zanella b8a7c7da4e Refactor vDSO initialization code 
Linux vDSO initialization code the internal function pointers require a
lot of duplicated boilerplate over different architectures.  This patch
aims to simplify not only the code but the required definition to enable
a vDSO symbol.

The changes are:

  1. Consolidate all init-first.c on only one implementation and enable
     the symbol based on HAVE_*_VSYSCALL existence.

  2. Set the HAVE_*_VSYSCALL to the architecture expected names string.

  3. Add a new internal implementation, get_vdso_mangle_symbol, which
     returns a mangled function pointer.

Currently the clock_gettime, clock_getres, gettimeofday, getcpu, and time
are handled in an arch-independent way, powerpc still uses some
arch-specific vDSO symbol handled in a specific init-first implementation.

Checked on aarch64-linux-gnu, arm-linux-gnueabihf, i386-linux-gnu,
mips64-linux-gnu, powerpc64le-linux-gnu, s390x-linux-gnu,
sparc64-linux-gnu, and x86_64-linux-gnu.

	* sysdeps/powerpc/powerpc32/backtrace.c (is_sigtramp_address,
	is_sigtramp_address_rt): Use HAVE_SIGTRAMP_{RT}32 instead of SHARED.
	* sysdeps/powerpc/powerpc64/backtrace.c (is_sigtramp_address):
	Likewise.
	* sysdeps/unix/sysv/linux/aarch64/init-first.c: Remove file.
	* sysdeps/unix/sysv/linux/aarch64/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/arm/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/arm/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/x86/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sysdep.h
	(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL): Define value based on kernel exported
	name.
	* sysdeps/unix/sysv/linux/arm/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/mips/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sysdep.h
	(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETCPU_VSYSCALL, HAVE_TIME_VSYSCALL, HAVE_GET_TBFREQ,
	HAVE_SIGTRAMP_RT64, HAVE_SIGTRAMP_32, HAVE_SIGTRAMP_RT32i,
	HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/riscv/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL,
	HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL,
	HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/s390/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL,
	HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL,
	HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/sparc/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
	HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sysdep.h
	(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL,
	HAVE_GETCPU_VSYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/dl-vdso.h (VDSO_NAME, VDSO_HASH): Define to
	invalid names if architecture does not define them.
	(get_vdso_mangle_symbol): New symbol.
	* sysdeps/unix/sysv/linux/init-first.c: New file.
	* sysdeps/unix/sysv/linux/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/init-first.c (gettimeofday,
	clock_gettime, clock_getres, getcpu, time): Remove declaration.
	(__libc_vdso_platform_setup_arch): Likewise and use
	get_vdso_mangle_symbol to setup vDSO symbols.
	(sigtramp_rt64, sigtramp32, sigtramp_rt32, get_tbfreq): Add
	attribute_hidden.
	* sysdeps/unix/sysv/linux/powerpc/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/sysdep-vdso.h (VDSO_SYMBOL): Remove
	definition.
2019-09-17 17:09:24 -03:00
..
alpha alpha: force old OSF1 syscalls for getegid, geteuid and getppid [BZ #24986] 2019-09-14 18:22:52 +02:00
arm Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
bsd Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
i386 Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
inet Remove obsolete, never-implemented XSI STREAMS declarations 2019-03-14 15:44:15 +01:00
mips Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
powerpc Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
sh Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
sysv/linux Refactor vDSO initialization code 2019-09-17 17:09:24 -03:00
x86_64 Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
clock_gettime.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
clock_nanosleep.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
clock_settime.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
confstr.h
get_child_max.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
getlogin_r.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
getlogin.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
getpagesize.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
grantpt.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
ifreq.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
Implies
make-syscalls.sh Remove PREPARE_VERSION and PREPARE_VERSION_KNOW 2019-09-17 17:09:01 -03:00
Makefile Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
pt-fcntl.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
s-proto-cancel.S
s-proto.S
setxid.h
sockatmark.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
stime.c Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
syscall-template.S Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
syscall.S Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00
syscalls.list posix: Consolidate Linux fsync syscall 2017-05-18 18:06:47 -03:00
sysdep.h Prefer https to http for gnu.org and fsf.org URLs 2019-09-07 02:43:31 -07:00