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brk.S revision 1.1 
      1 /*	$NetBSD: brk.S,v 1.1 2014/09/03 19:34:26 matt Exp $	*/
      2 
      3 #include "SYS.h"
      4 
      5 #if defined(LIBC_SCCS) && !defined(lint)
      6 __RCSID("$NetBSD: brk.S,v 1.1 2014/09/03 19:34:26 matt Exp $")
      7 #endif /* LIBC_SCCS && !lint */
      8 
      9 	.hidden	_C_LABEL(__curbrk)
     10 	.hidden	_C_LABEL(__minbrk)
     11 	.globl	_C_LABEL(__curbrk)
     12 	.globl	_C_LABEL(__minbrk)
     13 	.globl	_C_LABEL(_end)
     14 
     15 #ifdef WEAK_ALIAS
     16 WEAK_ALIAS(brk, _brk)
     17 #endif
     18 	.data
     19 	.p2align 2
     20 _C_LABEL(__minbrk):
     21 	.long	_C_LABEL(_end)
     22 _C_LABEL(__curbrk):
     23 	.long	_C_LABEL(_end)
     24 
     25 	.text
     26 ENTRY(_brk)
     27 #ifdef __PIC__
     28 	l.or	r8,r9,r0
     29 	PIC_GOTSETUP(r7)
     30 	l.or	r9,r8,r0
     31 	l.movhi	r6,gotoffhi(_C_LABEL(__minbrk))
     32 	l.ori	r6,r6,gotofflo(_C_LABEL(__minbrk))
     33 	l.add	r6,r6,r7
     34 #else
     35 	l.movhi	r6,hi(_C_LABEL(__minbrk))
     36 	l.ori	r6,r6,lo(_C_LABEL(__minbrk))
     37 #endif
     38 	l.lwz	r5,0(r6)		# r5 = __minbrk
     39 	l.sfgts	r5,r3			# if (__minbrk <= r3)
     40 	l.cmov	r5,r5,r3		# choose larger
     41 	l.or	r3,r5,r0		# new break value
     42 	_DOSYSCALL(break)		# assume, that r5 is kept
     43 	l.bf	_C_LABEL(__cerror)
     44 	l.nop
     45 	l.sw	__SIZEOF_POINTER__(r6),r5
     46 	l.xor	r11, r11, r11		# return 0
     47 	l.jr	lr			# return 0
     48 	l.nop
     49 END(_brk)
     50