我正在分析一个linux异常代码.顺便说一句,我无法理解gnu汇编语法.
svc_preempt:
mov r8, lr
1: bl preempt_schedule_irq @ irq en/disable is done inside
ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
tst r0, #_TIF_NEED_RESCHED
moveq pc, r8 @ go again
b 1b
在这段代码中,我可以看到"b 1b",但我无法在任何地方找到"1b"标签.
和,
#ifdef CONFIG_NEON
adr r6, .LCneon_thumb_opcodes
b 2f
#endif
call_fpe:
#ifdef CONFIG_NEON
adr r6, .LCneon_arm_opcodes
2:
ldr r7, [r6], #4 @ mask value
cmp r7, #0 @ end mask?
beq 1f
and r8, r0, r7
ldr r7, [r6], #4 @ opcode bits matching in …我想知道如何使用arm-linux-androideabi编译器.该编译器是android-ndk工具.
有ndk-build刀具android-ndk工具.要编译ethercat堆栈,我只需要arm-linux-androideabi编译器.
但是,我看到了这个消息.
root@ubuntu:/opt/android/android-ndk-r9c/jni# arm-linux-androideabi-gcc -o test test.c
/opt/android/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: cannot open crtbegin_dynamic.o: No such file or directory
/opt/android/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: cannot open crtend_android.o: No such file or directory
/opt/android/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lc
/opt/android/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: cannot find -ldl
collect2: ld returned 1 exit status
我该怎么做？