63 lines
1.3 KiB
ArmAsm
63 lines
1.3 KiB
ArmAsm
# Test for clz
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.org 0
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# Provide program starting address to linker
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.global _start
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.extern clz
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.extern tohex
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/* newlib system calls */
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.set SYSEXIT, 93
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.set SYSWRITE, 64
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.section .rodata
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inputs:
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.word 0
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.word 1
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.word 2
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.word 3
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.word 0xF
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.word 0xFF
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.word 0xFFF
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.word 0xFFFF
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.word 0xFFFFF
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.word 0xFFFFFF
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.word 0xFFFFFFF
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.word 0xFFFFFFFF
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.word 0x80000000
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.word 0x00008000
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inputs_end:
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.section .bss
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buf: .skip 9
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.text
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_start:
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li a0, '\n'
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la a1, buf
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sb a0, 8(a1) # append newline to buf
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la s0, inputs # init loop variables
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la s1, inputs_end
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loop:
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lw a0, 0(s0) # input value
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jal clz
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la a1, buf
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jal tohex
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li t0, SYSWRITE # "write" syscall
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li a0, 1 # 1 = standard output (stdout)
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la a1, buf # load address of output string
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li a2, 9 # length of output string
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ecall # invoke syscall to print the string
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addi s0, s0, 4 # increment input pointer to the next input
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bltu s0, s1, loop # if the input address is less than inputs_end, loop
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li t0, SYSEXIT # "exit" syscall
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la a0, 0 # Use 0 return code
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ecall # invoke syscall to terminate the program
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