diff options
Diffstat (limited to 'lib/libc/i386/sys/brk.S')
| -rw-r--r-- | lib/libc/i386/sys/brk.S | 58 |
1 files changed, 42 insertions, 16 deletions
diff --git a/lib/libc/i386/sys/brk.S b/lib/libc/i386/sys/brk.S index f85186c..4fdf0c6 100644 --- a/lib/libc/i386/sys/brk.S +++ b/lib/libc/i386/sys/brk.S @@ -1,6 +1,6 @@ /*- - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. @@ -32,34 +32,60 @@ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. + * + * $Id$ */ -#if defined(SYSLIBC_SCCS) && !defined(lint) - .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" -#endif /* SYSLIBC_SCCS and not lint */ +#if defined(SYSLIBC_RCS) && !defined(lint) + .text + .asciz "$Id$" +#endif /* SYSLIBC_RCS and not lint */ #include "SYS.h" -#define SYS_brk 17 - - .globl curbrk - .globl minbrk + .globl HIDENAME(curbrk) + .globl HIDENAME(minbrk) ENTRY(_brk) jmp ok ENTRY(brk) +#ifdef PIC + movl 4(%esp),%eax + PIC_PROLOGUE + movl PIC_GOT(HIDENAME(curbrk)),%edx # set up GOT addressing + movl PIC_GOT(HIDENAME(minbrk)),%ecx # + PIC_EPILOGUE + cmpl %eax,(%ecx) + jbe ok + movl (%ecx),%eax + movl %eax,4(%esp) +ok: + lea SYS_break,%eax + KERNCALL + jb err + movl 4(%esp),%eax + movl %eax,(%edx) + movl $0,%eax + ret +err: + PIC_PROLOGUE + jmp PIC_PLT(HIDENAME(cerror)) + +#else + movl 4(%esp),%eax - cmpl %eax,minbrk - jl ok - movl minbrk,%eax + cmpl %eax,HIDENAME(minbrk) + jbe ok + movl HIDENAME(minbrk),%eax movl %eax,4(%esp) ok: - lea SYS_brk,%eax - LCALL(7,0) + lea SYS_break,%eax + KERNCALL jb err movl 4(%esp),%eax - movl %eax,curbrk + movl %eax,HIDENAME(curbrk) movl $0,%eax ret err: - jmp cerror + jmp HIDENAME(cerror) +#endif |
