[fpc-pascal] System call ABI problem on ppc Linux

Tobias Giesen tobiasgiesen at gmail.com
Tue Dec 5 19:49:44 CET 2017

Interesting! But my report was based on my development machine, a PowerBook G4.

Apparently the special instructions are not used or not causing a problem because it also runs fine on the NAS.


Please excuse the shortness of this mail which was sent from my mobile phone. If necessary, I will send more information later.

Tobias Giesen

> Am 05.12.2017 um 19:20 schrieb Karoly Balogh (Charlie/SGR) <charlie at scenergy.dfmk.hu>:
> Hi,
>> On Tue, 5 Dec 2017, tobiasgiesen at gmail.com wrote:
>> I think the only problem is with fpmake, which doesn't include
>> FPC_ABI_EABI for powerpc 32-bit processors.
>> My use case is running my software on a Synology DS-413 NAS, which has a
>> PowerPC processor. It's only a few years old. Nowadays they use only
>> Intel and ARM.
> Please note that your NAS has a Freescale P1022 CPU, which has an e500v2
> CPU core. In Linux architecture terms, this isn't a regular PowerPC but
> PowerPCSPE, as it has a non-standard FPU. This means that classic PowerPC
> FPU instructions are not supported, or supported only with kernel
> emulation. It's also entirely incompatible with regular applications using
> Altivec or VMX SIMD, as the instruction encoding overlaps. It could also
> mean that the syscall ABI *could* be different to regular PowerPCs. I
> don't know if it is, but could be.
> Free Pascal doesn't support PPCSPE CPUs officially (we always generate
> classic FPU code for memory copies for example, and the PPC code generator
> doesn't support the SPE FPU or the softfpu at this point), so at least we
> should verify if your patch doesn't cause problems on regular PPC Linux
> installations, or if this bug also exist there.
> Charlie
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