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Wed May 29 00:57:37 1996 David Mosberger-Tang <davidm@azstarnet.com>

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* sysdeps/unix/bsd/osf/alpha/brk.S,
 	sysdeps/unix/sysv/linux/alpha/brk.S (__curbrk): Store the entire
 	break value, not just the low 32 bits to accomodate large
 	memories.
Tue May 28 10:46:04 1996  Richard Henderson  <rth@tamu.edu>

	* sysdeps/unix/sysv/linux/alpha/brk.S: Rather than attempt to
	dynamically resolve _end for initializing __curbrk, support the
	brk(0) query idiom.
This commit is contained in:
Roland McGrath 1996-06-02 18:48:36 +00:00
parent e872219f50
commit d663482017
1 changed files with 7 additions and 13 deletions
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20
sysdeps/unix/sysv/linux/alpha/brk.S
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@ -23,17 +23,7 @@ break value (instead of the new, requested one). */
#include <sysdep.h> #include <sysdep.h>
#include <errnos.h> #include <errnos.h>
#ifndef HAVE_GNU_LD .comm __curbrk, 8
#define _end end
#endif
.extern _end,8
.data
.globl __curbrk
__curbrk:
.quad _end
.text .text
LEAF(__brk, 0) LEAF(__brk, 0)
@ -42,11 +32,15 @@ LEAF(__brk, 0)
ldi v0, __NR_brk ldi v0, __NR_brk
call_pal PAL_callsys call_pal PAL_callsys
/* Correctly handle the brk(0) query case. */
cmoveq a0, v0, a0
subq a0, v0, t0 subq a0, v0, t0
bne t0, error bne t0, error
/* Update __curbrk and return cleanly. */ /* Update __curbrk and return cleanly. */
stl a0, __curbrk stq a0, __curbrk
mov zero, v0 mov zero, v0
ret ret
@ -54,6 +48,6 @@ LEAF(__brk, 0)
error: ldi v0, ENOMEM error: ldi v0, ENOMEM
jmp zero, syscall_error jmp zero, syscall_error
.end __brk END(__brk)
weak_alias (__brk, brk) weak_alias (__brk, brk)