newlib sscanf() throw hardfault exception in stm32

i use gcc compile my project, use the function sscanf() in main, the stack size is 4k, i debug the program in gdb, show VPUSH instruction throw the exception.

and i 开发者_如何学Ctest the function sprintf(), it work nice. why the function sscanf() is not work in newlib for stm32?

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Apart from STM32 F4 series, those controllers do not support floating point instructions, vpush being one of them.

The problem should be solved by compiling newlib with -mfloat-abi=soft (and not softfp or hard).