给自己挖了个坑，一切都得从“Hello World”开始。
hello.S
.data msg: .ascii "Hello, World!\n" len = . - msg .text .globl _start _start: /* syscall write(int fd, const void *buf, size_t count) */ mov %r0, $1 /* fd -> stdout */ ldr %r1, =msg /* buf -> msg */ ldr %r2, =len /* count -> len(msg) */ mov %r7, $4 /* write is syscall #4 */ swi $0 /* invoke syscall */ /* syscall exit(int status) */ mov %r0, $0 /* status -> 0 */ mov %r7, $1 /* exit is syscall #1 */ swi $0 /* invoke syscall */
arm-linux-androideabi-as -o hello.o hello.S
arm-linux-androideabi-ld -s -o hello hello.o
adb push hello /data/local/tmp/hello
adb shell /data/local/tmp/hello
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