我怎么能知道一个ARM库使用hardfp？ [英] How can I know if an ARM library is using hardfp?

问题描述

我没有进入build命令，我只是有图书馆在我的系统。

I don't have access to the build command, I just have the library in my system.

我想我可以建立一个hardfp可执行文件，反对和测试环节，但我想知道如果有一个更简单的方法。

I guess I could build an hardfp executable that links against it and test, but I'm wondering if there's an easier way.

推荐答案

执行 readelf -A library.so ：如果打印标签的列表中包含 Tag_ABI_VFP_args：VFP寄存器，那么它是一个 hardfp 二进制，否则假定 softfp 。

Execute readelf -A library.so: if the list of printed tags contains Tag_ABI_VFP_args: VFP registers, then it is a hardfp binary, otherwise assume softfp.

例如。 readelf -A /lib/arm-linux-gnueabihf/libm.so.6 将产生

Attribute Section: aeabi
File Attributes
  Tag_CPU_name: "7-A"
  Tag_CPU_arch: v7
  Tag_CPU_arch_profile: Application
  Tag_ARM_ISA_use: Yes
  Tag_THUMB_ISA_use: Thumb-2
  Tag_FP_arch: VFPv3-D16
  Tag_ABI_PCS_wchar_t: 4
  Tag_ABI_FP_denormal: Needed
  Tag_ABI_FP_exceptions: Needed
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_align_preserved: 8-byte, except leaf SP
  Tag_ABI_enum_size: int
  Tag_ABI_HardFP_use: SP and DP
  Tag_ABI_VFP_args: VFP registers
  Tag_ABI_optimization_goals: Aggressive Speed
  Tag_CPU_unaligned_access: v6

在另一边， readelf -A /lib/arm-linux-gnueabi/libm.so.6 产生

Attribute Section: aeabi
File Attributes
  Tag_CPU_name: "7-A"
  Tag_CPU_arch: v7
  Tag_CPU_arch_profile: Application
  Tag_ARM_ISA_use: Yes
  Tag_THUMB_ISA_use: Thumb-2
  Tag_FP_arch: VFPv3-D16
  Tag_ABI_PCS_wchar_t: 4
  Tag_ABI_FP_denormal: Needed
  Tag_ABI_FP_exceptions: Needed
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_align_preserved: 8-byte, except leaf SP
  Tag_ABI_enum_size: int
  Tag_ABI_optimization_goals: Aggressive Speed
  Tag_CPU_unaligned_access: v6

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