Debugging with GDB: MIPS Embedded

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21.3.5 MIPS Embedded

GDB supports these special commands for MIPS targets:

set mipsfpu double

set mipsfpu single

set mipsfpu none

set mipsfpu auto

show mipsfpu

If your target board does not support the MIPS floating point coprocessor, you should use the command ‘set mipsfpu none’ (if you need this, you may wish to put the command in your GDB init file). This tells GDB how to find the return value of functions which return floating point values. It also allows GDB to avoid saving the floating point registers when calling functions on the board. If you are using a floating point coprocessor with only single precision floating point support, as on the R4650 processor, use the command ‘set mipsfpu single’. The default double precision floating point coprocessor may be selected using ‘set mipsfpu double’.

In previous versions the only choices were double precision or no floating point, so ‘set mipsfpu on’ will select double precision and ‘set mipsfpu off’ will select no floating point.

As usual, you can inquire about the mipsfpu variable with ‘show mipsfpu’.