On Sat, 2025-06-07 at 16:38 +0200, Andreas Schwab wrote: > On Jun 07 2025, John Paul Adrian Glaubitz wrote: > > > On Sat, 2025-06-07 at 11:58 +0200, Andreas Schwab wrote: > > > On Jun 07 2025, John Paul Adrian Glaubitz wrote: > > > > > > > Who is "we"? The official(!) ABI says that pointers are supposed to be > > > > aligned > > > > with 4 bytes, not 2 bytes. > > > > > > No, that is wrong. The official ABI uses 2 byte alignment. > > > > The official AT&T SysV ABI states that pointers must be aligned with 4 > > bytes. > > If you want to use AT&T System V, you are free to do so. But Linux is > not AT&T System V.
It kinda is: glaubitz@esk:~/gcc/gcc/config/m68k$ grep -i svr4 linux.h m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral, FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the For m68k/SVR4 look for integer values in d0, pointer values in d0 /* For m68k SVR4, structures are returned using the reentrant For m68k/SVR4, some types (doubles for example) are aligned on 8 byte glaubitz@esk:~/gcc/gcc/config/m68k$ What I don't understand: What's the deal with changing the ABI now? The people who object the change still haven't come with a convincing argument so far except for the circular reasoning that you cannot change the ABI because that would change the ABI. Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
