57 lines
805 B
ArmAsm
57 lines
805 B
ArmAsm
#
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.sect .text; .sect .rom; .sect .data; .sect .bss
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/* Stores a variable-sized block from the stack.
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*
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* On entry: r2 = size
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* Stack: ( block address -- )
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* Preserves r25 for .lar4 and .sar4
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*/
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.sect .text
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.define .sts4
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.sts4:
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lw r4, 0(sp) ! r4 = address
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addiu sp, sp, 4 ! sp = pointer to block
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! Sizes 1 and 2 are handled specially.
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li at, 1
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beq r2, at, byte_sized
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nop
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li at, 2
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beq r2, at, word_sized
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nop
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! Else the size must be a multiple of 4.
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srl r5, r2, 2 ! r5 = number of words
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! Copy.
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1:
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lw at, 0(sp)
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sw at, 0(r4)
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addiu sp, sp, 4
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addiu r4, r4, 4
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addiu r5, r5, -1
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bne r5, zero, 1b
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nop
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jr ra
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nop
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byte_sized:
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lw at, 0(sp)
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sb at, 0(r4)
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addiu sp, sp, 4
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jr ra
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nop
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word_sized:
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lw at, 0(sp)
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sh at, 0(r4)
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addiu sp, sp, 4
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jr ra
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nop
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