H.J. Lu 086df229ee i386: Add <startup.h> [BZ #21913] ... On Linux/i386, there are 3 ways to make a system call: 1. call *%gs:SYSINFO_OFFSET. This requires TLS initialization. 2. call *_dl_sysinfo. This requires relocation of _dl_sysinfo. 3. int $0x80. This is slower than #2 and #3, but works everywhere. When an object file is compiled with PIC, #1 is prefered since it is faster than #3 and doesn't require relocation of _dl_sysinfo. For dynamic executables, ld.so initializes TLS. However, for static executables, before TLS is initialized by __libc_setup_tls, #3 should be used for system calls. This patch adds <startup.h> which defines _startup_fatal and defaults it to __libc_fatal. It replaces __libc_fatal with _startup_fatal in static executables where it is called before __libc_setup_tls is called. This header file is included in all files containing functions which are called before __libc_setup_tls is called. On Linux/i386, when PIE is enabled by default, _startup_fatal is turned into ABORT_INSTRUCTION and I386_USE_SYSENTER is defined to 0 so that "int $0x80" is used for system calls before __libc_setup_tls is called. Tested on i686 and x86-64. Without this patch, all statically-linked tests will fail on i686 when the compiler defaults to -fPIE. [BZ #21913] * csu/libc-tls.c: Include <startup.h> first. (__libc_setup_tls): Call _startup_fatal instead of __libc_fatal. * elf/dl-tunables.c: Include <startup.h> first. * include/libc-symbols.h (BUILD_PIE_DEFAULT): New. * sysdeps/generic/startup.h: New file. * sysdeps/unix/sysv/linux/i386/startup.h: Likewise. * sysdeps/unix/sysv/linux/i386/brk.c [BUILD_PIE_DEFAULT != 0] (I386_USE_SYSENTER): New. Defined to 0.		2017-08-08 08:43:15 -07:00
..
abi-note.S
check_fds.c	Assume that O_NOFOLLOW is always defined	2017-04-13 21:28:18 +02:00
dso_handle.c
elf-init.c
errno-loc.c
errno.c
gmon-start.c
init-first.c	getopt: remove USE_NONOPTION_FLAGS	2017-04-07 07:45:53 -04:00
init.c
libc-start.c	powerpc: Fix float128 IFUNC relocations [BZ #21707]	2017-07-17 17:49:26 -03:00
libc-tls.c	i386: Add <startup.h> [BZ #21913]	2017-08-08 08:43:15 -07:00
Makefile
start.c
sysdep.c
version.c
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