armv6

问题 I have a situation where some of the address space is sensitive in that you read it you crash as there is nobody there to respond to that address. pop {r3,pc} bx r0 0: e8bd8008 pop {r3, pc} 4: e12fff10 bx r0 8: bd08 pop {r3, pc} a: 4700 bx r0 The bx was not created by the compiler as an instruction, instead it is the result of a 32 bit constant that didnt fit as an immediate in a single instruction so a pc relative load is setup. This is basically the literal pool. And it happens to have bits

问题 I have a situation where some of the address space is sensitive in that you read it you crash as there is nobody there to respond to that address. pop {r3,pc} bx r0 0: e8bd8008 pop {r3, pc} 4: e12fff10 bx r0 8: bd08 pop {r3, pc} a: 4700 bx r0 The bx was not created by the compiler as an instruction, instead it is the result of a 32 bit constant that didnt fit as an immediate in a single instruction so a pc relative load is setup. This is basically the literal pool. And it happens to have bits

问题 I understand that a lot of compilation issues on the Pi Zeros are due to the fact that they use armv6, whereas the newer Raspberry Pi's like the 3 A+ and B+ use armv7. However, I do not understand how to find the offending library in an application that is causing the issue, and if there is perhaps a simple fix for the problem. Background: I am trying to port an application from a Linux Desktop environment to the Pi Zero (running armv6). I successfully ported it to the Pi 3 B and B+. That is,

问题 AVD has VFP support for armeabi-v7a but has not for armeabi. I experience problem with float point on ARMv6 and wish to setup ARMv6 with FPU on virtual device. (It is hardware similar to Samsung Galaxy ACE, Y, Pocket, GIO) So I look for solution to get another CPU/ABI option for Android Virtual Device. UPDATE AVD settings are located in ~/.android/avd/config.ini It is possible to add line like hw.cpu.model=cortex-a8 Right now it does not work If you know required settings I will mark your

问题 How would I relocate the ARM exception vectors ? Basically, I need to be able to remap them in a way, so when the ARM core tries to execute the vector, it should execute the custom exception vector that is stored in kernel's RAM bit and not in the ROM that is at 0x0 . Is that possible? Or am I meant to route the interrupts to the kernel from the ROM ? So essentially, is there a way of telling the ARM core, " here is the new address for your vector table "? I know that you can start the CPU in

问题 Is there a decent guide explaining how to use the TLB ( Translation Lookaside Buffers ) tables on an ARM1176JZF-S core? Having looked over the technical documentation for the that ARM platform I still have no clue what a TLB is or what it looks like. As far as I understand, each TLB entry maps a virtual page to a physical page, allowing remapping and controlling memory permissions. Apart from that, I have absolutely no clue on how to use them. What structure does a TLB entry have? How do I

问题 Is there a decent guide explaining how to use the TLB ( Translation Lookaside Buffers ) tables on an ARM1176JZF-S core? Having looked over the technical documentation for the that ARM platform I still have no clue what a TLB is or what it looks like. As far as I understand, each TLB entry maps a virtual page to a physical page, allowing remapping and controlling memory permissions. Apart from that, I have absolutely no clue on how to use them. What structure does a TLB entry have? How do I

问题 I wish to target ARMv6 with VFP Android device. I have following line in my Android.mk file to enable VFP LOCAL_CFLAGS := -marm -mfloat-abi=softfp -mfpu=vfp -Wmultichar I believe I target ARMv5 with VFP . I edited android-ndk-r8b\toolchains\arm-linux-androideabi-4.6\setup.mk to remove -msoft-float . I also tried with original setup.mk My code works fine 99.99% of time but some times goes crazy on ARMv6 devices. I have special code to detect when it goes crazy. Code glm::vec3 D = P1 - P2;

问题 I try to build an app for ARMv6 but, fail. I guess the problem is the Toolchain which supports Hard Float but, ARMv6 does not. Well, first i set -march=armv6, where compilation fails. /opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/arm-linux-gnueabihf/libc/usr/include/bits/byteswap.h: In function ‘__bswap_32’: /opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/arm-linux-gnueabihf/libc/usr/include/bits/byteswap.h:45:1: sorry, unimplemented: Thumb-1 hard-float VFP ABI Additionally, i

问题 In compiling iPhone apps, there is a setting for "Optimized" architecture (armv7 only) vs a standard armv6/armv7 architecture. What are the benefits/consequences of compiling an armv7 only architecture? 回答1: A smaller executable is a faster download from the app store. However, you do cut out non-armv7 devices. 回答2: Unless your program requires OpenGLES 2.0 (which is only supported on armv7-supporting devices), you should compile the standard fat (armv6/armv7) binary. A fat binary is