prfp

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

The prfp Command
The prfp Command

NAME
     prfp - convert between hex and floating-point

SYNOPSIS

prfp { [ -f ] fpvalue | [ hexvalue ] hexvalue }

DESCRIPTION
     prfp is a host-resident utility that
     converts between hex  and  floating-point.  It  handles
     both  single- and double-precision values. You can convert a
     floating-point value to hex, or a  hex  value  to  floating-
     point notation.

OPTIONS

     -f   Specify that the input floating-point value is to  
     converted to single precision format.

EXAMPLES
     Convert the value 3.142 to hex using double  precision  for-
     mat.

     % prfp 3.142

     400922d0 e5604189 dp=3.142000e+00

     Convert the value 3.142 to hex using single  precision  for-
     mat.

     % prfp -f 3.142

     40491687 sp=3.142000e+00

     Convert the 64-bit  hex  value  to  floating-point  notation
     using double precision format.

     % prfp 400922d0 e5604189

     400922d0 e5604189 dp=3.142000e+00

     Convert the 64-bit  hex  value  to  floating-point  notation
     using double precision format.

     % prfp 40491687

     40491687 sp=3.142000e+00