62 lines
1.1 KiB
ArmAsm
62 lines
1.1 KiB
ArmAsm
" Test program for several system calls: open, read, write, close, exit
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" Do:
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" ./as7 write_test.s > a.out
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" ./a7out -d a.out
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main:
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" Test the lac, dac instructions
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lac in
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dac out
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" Write hello to fd1 i.e stdout
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lac d1
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sys write; hello; 7
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" Test if the assembler can dac into a mid-line label
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lac helloptr
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dac 1f
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lac d1
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sys write; 1:0; 7
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" Try to open file fred
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sys open; fred; 0;
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" read 5 words into the buffer from stdin: type in 10 or more characters!
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lac d0
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sys read; buf; 5
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" Stop and dump memory, so you can see five words at location 0400
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" Comment out the hlt instruction to test close and exit
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hlt
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" close stdin
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lac d0
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sys close
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" exit
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sys exit
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" We should not get to the halt instruction
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hlt
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" Some memory locations for lac and dac
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. = 0100
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in: 023
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. = 0200
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out: 0
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" Hello, world\n, two ASCII chars per word
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hello: <He>; <l 0154; 0157 ,>; 040; <wo>; <rl>; <d 012
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helloptr: hello
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" fred as a four word filename
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fred: <fr>; <ed>; 040040; 040040
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" Input buffer for read
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. = 0400
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buf: 0
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d0: 0
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d1: 1
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