On 07/25/2018 11:48 PM, Shivaprasad G Bhat wrote: > Reference: > https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#REG
This document is for _CALL_ELF < 2. For ppc64le, the document is at https://openpowerfoundation.org/wp-content/uploads/2016/03/ABI64BitOpenPOWERv1.1_16July2015_pub4.pdf In both cases, it appears that we can (ab)use SP+16 to save the value of r14 across the syscall. This slot would normally be used for saving our own return address (LR), but we have no need to save that value because it *is* preserved across the syscall. r~
