* in1: source address
* in2: number of bytes to copy
* Output:
- * 0 if success, or number of byte NOT copied if error occurred.
+ * for memcpy: return dest
+ * for copy_user: return 0 if success,
+ * or number of byte NOT copied if error occurred.
*
* Copyright (C) 2002 Intel Corp.
* Copyright (C) 2002 Ken Chen <kenneth.w.chen@intel.com>
and r28=0x7,in0
and r29=0x7,in1
mov f6=f0
+ mov retval=in0
br.cond.sptk .common_code
;;
+END(memcpy)
GLOBAL_ENTRY(__copy_user)
.prologue
// check dest alignment
mov f6=f1
mov saved_in0=in0 // save dest pointer
mov saved_in1=in1 // save src pointer
- mov saved_in2=in2 // save len
+ mov retval=r0 // initialize return value
;;
.common_code:
cmp.gt p15,p0=8,in2 // check for small size
cmp.ne p14,p0=0,r29 // check src alignment
add src0=0,in1
sub r30=8,r28 // for .align_dest
- mov retval=r0 // initialize return value
+ mov saved_in2=in2 // save len
;;
add dst0=0,in0
add dst1=1,in0 // dest odd index
add src_pre_mem=0,src0 // prefetch src pointer
add dst_pre_mem=0,dst0 // prefetch dest pointer
and src0=-8,src0 // 1st src pointer
-(p7) mov ar.lc = r21
+(p7) mov ar.lc = cnt
(p8) mov ar.lc = r0
;;
TEXT_ALIGN(32)
#undef B
#undef C
#undef D
-END(memcpy)
/*
* Due to lack of local tag support in gcc 2.x assembler, it is not clear which
clrrrb
;;
alloc saved_pfs_stack=ar.pfs,3,3,3,0
+ cmp.lt p8,p0=A,r0
sub B = dst0, saved_in0 // how many byte copied so far
;;
+(p8) mov A = 0; // A shouldn't be negative, cap it
+ ;;
sub C = A, B
sub D = saved_in2, A
;;