From 6abc8f6c7c847291a9b20cb5b84e9a2dfe3b578a Mon Sep 17 00:00:00 2001 From: Austin Foxley Date: Sat, 17 Oct 2009 13:17:51 -0700 Subject: mips specific bits needed for nptl * vfork impl with support for SAVE_PID, RESTORE_PID * sysdep.h assembly macros Signed-off-by: Austin Foxley --- libc/sysdeps/linux/mips/sys/asm.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'libc/sysdeps/linux/mips/sys/asm.h') diff --git a/libc/sysdeps/linux/mips/sys/asm.h b/libc/sysdeps/linux/mips/sys/asm.h index 79d143975..d424ed3b1 100644 --- a/libc/sysdeps/linux/mips/sys/asm.h +++ b/libc/sysdeps/linux/mips/sys/asm.h @@ -472,4 +472,20 @@ symbol = value # define MTC0 dmtc0 #endif +/* The MIPS archtectures do not have a uniform memory model. Particular + platforms may provide additional guarantees - for instance, the R4000 + LL and SC instructions implicitly perform a SYNC, and the 4K promises + strong ordering. + + However, in the absence of those guarantees, we must assume weak ordering + and SYNC explicitly where necessary. + + Some obsolete MIPS processors may not support the SYNC instruction. This + applies to "true" MIPS I processors; most of the processors which compile + using MIPS I implement parts of MIPS II. */ + +#ifndef MIPS_SYNC +# define MIPS_SYNC sync +#endif + #endif /* sys/asm.h */ -- cgit v1.2.3