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calling C from assembly (64 bit)
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| .section .data | |
| prompt: .asciz "Please input a number:\n" | |
| format: .asciz "%d" | |
| output: .asciz "The largest value is %d\n" | |
| debug: .asciz "You gave me : '%d'!\n" | |
| .section .text | |
| .globl main | |
| main: | |
| movq $prompt, %rdi | |
| movq $0, %rax | |
| call printf # Print out the input prompt. | |
| subq $8, %rsp # Allocate int on the stack. | |
| movq $format, %rdi | |
| movq %rsp, %rsi # Can't use register for scanf. Use mem location. | |
| movq $0, %rax | |
| call scanf # Get integer from input. | |
| movq $debug, %rdi | |
| movq (%rsp), %rsi | |
| movq $0, %rax | |
| call printf # Print out the input prompt. | |
| addq $8, %rsp # Clean up that int. | |
| ret |
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http://i.imgur.com/TNS0NW7.png