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C Register usage:
define(`RA', `%r14') C Return address
define(`SP', `%r15') C Stack pointer
define(`STANDARD_STACK_FRAME',`160')
C Dynamic stack space allocation
C AP is a general register to which the allocated space is assigned
C SPACE_LEN is the length of space, must be a multiple of 8
C FREE_STACK macro can be used to free the allocated space
C ALLOC_STACK(AP, SPACE_LEN)
define(`ALLOC_STACK',
`lgr $1,SP
aghi SP,-(STANDARD_STACK_FRAME+$2)
stg $1,0(SP)
la $1,STANDARD_STACK_FRAME (SP)')
C Free allocated stack space
C FREE_STACK(SPACE_LEN)
define(`FREE_STACK',
`aghi SP,STANDARD_STACK_FRAME+$1')
C XOR contents of two areas in storage with specific length
C DST: The destination area of storage
C SRC: The source area of storage
C LEN: The length of storage area. LEN <= 256
C TMP_ADDR: A temporary register that handles the XOR instrcution address
C All parameters are general registers and cannot be assigned to
C general register 0
C XOR_LEN(DST, SRC, LEN, TMP_ADDR)
define(`XOR_LEN',
`larl $4,18f
aghi $3,-1
jm 19f
ex $3,0($4)
j 19f
18: xc 0(1,$1),0($2)
19:')
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