On 19/08/2017 09:10, Andrew Makhorin wrote: > The document "System V ABI: Intel386 Architecture Processor Supplement" > says that contents of %ebx, %esi, and %edi must be preserved for the > caller. Does GCC for 32-bit GNU/Linux and for 32-bit Cygwin conform to > this ABI? If not, how to determine which registers are expected to be > saved by calling C functions? (NB: GCC supports dozens of platforms) You seem to be interested in the x86 "cdecl" ABI. https://en.wikipedia.org/wiki/X86_calling_conventions#cdecl I think the SysV and Microsoft ABI are close, but may differ over details, e.g. returning structs. Regards.
