45 lines
677 B
ArmAsm
45 lines
677 B
ArmAsm
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.data
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msg: .asciz "Hello World!\n"
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.text
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.global _start
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_start:
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ldr r0,=msg
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bl print
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mov r0,#0x0
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bl exit
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exit: @ NORETURN void exit(int code)
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@ code already in r0
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mov r7,#0x1
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svc #0x0
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print: @ void print(const char *str)
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stmdb sp!,{r0,lr}
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@ msg already in r0
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bl strlen
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mov r2,r0 @ len
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ldr r1,[sp] @ msg
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mov r7,#0x4 @ SYS_write
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mov r0,#1 @ FD_stdout
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svc #0x0
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ldmia sp!,{r0,lr}
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bx lr
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strlen: @ u32 strlen(const char *str)
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stmdb sp!,{r0,lr}
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strlen_loop:
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ldrb r1,[r0]
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cmp r1,#0
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beq strlen_end
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add r0,r0,#1
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b strlen_loop
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strlen_end:
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ldmia sp!,{r1,lr}
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sub r0,r0,r1
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bx lr
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