[fpc-devel] MIPS big-endian program starts but does nothing

Sergei Gorelkin sergei_gorelkin at mail.ru
Tue Sep 9 08:52:27 CEST 2014

09.09.2014 9:53, Sven Barth пишет:
> On 08.09.2014 22:54, Michael Ring wrote:
>> This smells like a problem I had on pic32. In my case the pic32 chips do
>> not have a floating point unit and the processor creates an illegal
>> instruction (or something similar) exception.
>> I solved this for me by patching out the call to the hardware
>> coprocessor when softfpu is selected.
> Which should be the correct approach for softfpu anyway. Afterall the premise of softfpu is that
> there is no hardware FPU to use and thus corresponding CPU instructions are useless (or as it seems
> in this case lead to nothing).

This patch is correct only if the goal is do disable floating-point completely. If the goal is to 
have floating-point calculations available using emulation, then the entire procedures SysInitFPU 
and SysResetFPU together with {$define FPC_SYSTEM_HAS_SYSRESETFPU} and {$define 
FPC_SYSTEM_HAS_SYSINITFPU} must be disabled. Doing so will cause softfpu-specific routines from 
generic.inc to be used.

I also wonder what is the correct way to generate code that calls softfpu:
2) -CfSOFT
3) -Ce


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