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https://github.com/panpaul/tiny_os
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27 lines
477 B
ArmAsm
27 lines
477 B
ArmAsm
.macro syscall msg ptr
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li a0, \msg
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li a1, \ptr
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ecall
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.endm
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.text
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.global _start
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_start:
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la t0, msg
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.loop:
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lb a2, 0(t0)
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beqz a2, .yield
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# msg: label = DebugPutChar(1), bits = 1, length = 3, transfer_cap = false
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# ptr: (any)
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syscall (1<<14 | 0<<8 | 3<<1 | 0), 0
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addi t0, t0, 1
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j .loop
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.yield:
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# msg: label = Yield(2), bits = 1, length = 2, transfer_cap = false
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# ptr: (any)
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syscall (2<<14 | 0<<8 | 2<<1 | 0), 0
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j _start
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.data
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msg : .string "Hello, world!\n\0"
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