diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysdep.S | 32 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysdep.h | 31 |
2 files changed, 53 insertions, 10 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.S b/sysdeps/unix/sysv/linux/i386/sysdep.S index 0130ad02a9..7d5444d6a6 100644 --- a/sysdeps/unix/sysv/linux/i386/sysdep.S +++ b/sysdeps/unix/sysv/linux/i386/sysdep.S @@ -1,4 +1,4 @@ -/* Copyright (C) 1995 Free Software Foundation, Inc. +/* Copyright (C) 1995, 1996 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 @@ -27,26 +27,46 @@ Cambridge, MA 02139, USA. */ .globl errno .type errno,@object .size errno,4 -errno: .space 4 +errno: .zero 4 .globl _errno .type _errno,@object _errno = errno /* This name is expected by hj libc.so.5 startup code. */ .text -/* The following code is not used at all in the shared library. - The PIC system call stubs set errno themselves. */ +/* The following code is only used in the shared library when we + compile the reentrant version. Otherwise each system call defines + each own version. */ -#ifndef PIC +#ifndef PIC /* The syscall stubs jump here when they detect an error. The code for Linux is almost identical to the canonical Unix/i386 code, except that the error number in %eax is negated. */ -.globl __syscall_error + .globl __syscall_error + .type __syscall_error,@function __syscall_error: negl %eax #define __syscall_error __syscall_error_1 #include <sysdeps/unix/i386/sysdep.S> +#endif /* !PIC */ + + +#ifdef _LIBC_REENTRANT + .globl __errno_location + .type __errno_location,@function +__errno_location: +#ifdef PIC + call .L2 +.L2: popl %ecx + addl $_GLOBAL_OFFSET_TABLE_+[.-.L2], %ecx + movl errno@GOT(%ecx), %eax +#else + movl $errno, %eax +#endif + ret +.Lfe1: + .size __errno_location, .Lfe1-__errno_location #endif diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h index c77bbbbf86..96470a19b9 100644 --- a/sysdeps/unix/sysv/linux/i386/sysdep.h +++ b/sysdeps/unix/sysv/linux/i386/sysdep.h @@ -45,21 +45,44 @@ Cambridge, MA 02139, USA. */ testl %eax, %eax; \ jl syscall_error; -#ifndef PIC +#ifndef PIC #define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ #else /* Store (- %eax) into errno through the GOT. */ +#ifdef _LIBC_REENTRANT #define SYSCALL_ERROR_HANDLER \ + .type syscall_error,@function; \ +syscall_error: \ + pushl %ebx; \ + call 0f; \ +0:popl %ebx; \ + xorl %edx, %edx; \ + addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ebx; \ + subl %eax, %edx; \ + movl errno@GOT(%ebx), %ecx; \ + movl %edx, (%ecx); \ + pushl %edx; \ + call __errno_location@PLT; \ + popl %ecx; \ + popl %ebx; \ + movl %ecx, (%eax); \ + movl $-1, %eax; \ + ret; +#else +#define SYSCALL_ERROR_HANDLER \ + .type syscall_error,@function; \ syscall_error: \ call 0f; \ 0:popl %ecx; \ - negl %eax; \ + xorl %edx, %edx; \ addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ecx; \ + subl %eax, %edx; \ movl errno@GOT(%ecx), %ecx; \ - movl %eax, (%ecx); \ + movl %edx, (%ecx); \ movl $-1, %eax; \ ret; -#endif +#endif /* _LIBC_REENTRANT */ +#endif /* PIC */ /* Linux takes system call arguments in registers: |