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* sysdeps/unix/sysv/linux/x86_64/sysdep.S [USE_TLS && HAVE___THREAD]:

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Define errno in .tbss.
	* sysdeps/unix/x86_64/sysdep.S [USE_TLS && HAVE___THREAD]: Use TLS
	access for setting errno.

	* sysdeps/unix/x86_64/sysdep.S: Store 32 bits at errno, not 64 bits.
	AFAICT, it was just blind luck that the word following errno in .bss
	was just alignment padding and not some other variable to be clobbered.
This commit is contained in:
Roland McGrath 2002-09-29 21:50:55 +00:00
parent cc590e1d4e
commit 28b48696d1
2 changed files with 21 additions and 6 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2002-09-29 Roland McGrath <roland@redhat.com>
* sysdeps/unix/sysv/linux/x86_64/sysdep.S [USE_TLS && HAVE___THREAD]:
Define errno in .tbss.
* sysdeps/unix/x86_64/sysdep.S [USE_TLS && HAVE___THREAD]: Use TLS
access for setting errno.
* sysdeps/unix/x86_64/sysdep.S: Store 32 bits at errno, not 64 bits.
AFAICT, it was just blind luck that the word following errno in .bss
was just alignment padding and not some other variable to be clobbered.
2002-09-29 Jakub Jelinek <jakub@redhat.com>
* sysdeps/unix/sysv/linux/kernel-features.h

16
sysdeps/unix/x86_64/sysdep.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2001 Free Software Foundation, Inc.
/* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -21,6 +21,7 @@
#include <bits/errno.h>
#include <bp-asm.h>
#include <bp-sym.h>
#include <tls.h>
.globl C_SYMBOL_NAME(errno)
.globl syscall_error
@ -40,28 +41,31 @@ syscall_error:
movq $EAGAIN, %rax /* Yes; translate it to EAGAIN. */
notb:
#endif
#ifndef PIC
#if USE_TLS && HAVE___THREAD
movq C_SYMBOL_NAME(errno)@GOTTPOFF(%rip), %rcx
movl %eax, %fs:0(%rcx)
#elif !defined PIC
# ifndef _LIBC_REENTRANT
movq %rax, C_SYMBOL_NAME(errno)
movl %eax, C_SYMBOL_NAME(errno)
# else
pushq %rax
PUSH_ERRNO_LOCATION_RETURN
call BP_SYM (__errno_location)
POP_ERRNO_LOCATION_RETURN
popq %rcx
movq %rcx, (%rax)
movl %ecx, (%rax)
# endif
#else
# ifndef _LIBC_REENTRANT
movq C_SYMBOL_NAME(errno)@GOTPCREL(%rip), %rcx
movq %rax, (%rcx)
movl %eax, (%rcx)
# else
pushq %rax
PUSH_ERRNO_LOCATION_RETURN
call C_SYMBOL_NAME (BP_SYM (__errno_location)@PLT)
POP_ERRNO_LOCATION_RETURN
popq %rcx
movq %rcx, (%rax)
movl %ecx, (%rax)
# endif
#endif
movq $-1, %rax