66 lines
1.4 KiB
ArmAsm
66 lines
1.4 KiB
ArmAsm
# Test for mul
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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 mul
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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 3
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.word 5
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.word 21
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.word 3
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.word 0xFFFF
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.word 100
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.word -7
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.word 3
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inputs_end:
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# llvm doesn't like this: error: expected relocatable expression
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#.set inputs_end, .-inputs
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# turns out it was right. That was calculating a length, which was
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# incorrect for how it was used for looping.
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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) # multiplicand
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lw a1, 4(s0) # multiplier
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jal mul
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# TODO: Format as an actual decimal
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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, 8 # increment input pointer to next pair of 64-bit inputs
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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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