yann@1: http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/unix/sysv/linux/sh/sysdep.h.diff?r1=1.9&r2=1.10&cvsroot=glibc
yann@1: 
yann@1: Ankur Sheth said:
yann@1: 
yann@1: "This is actually a workaround for a bug in the sh4.  The actual bug is
yann@1: documented here :
yann@1: http://documentation.renesas.com/eng/products/mpumcu/tu/tnsh7456ae.pdf
yann@1: Basically the cache & TLB should not be accessed for 4 (or was it 5?) cycles
yann@1: after isssuing a TRAPA instruction.  I didn't run into any specific problem
yann@1: because of this bug, but it seems useful to have and the patch itself seems
yann@1: pretty harmless."
yann@1: 
yann@1: 
yann@1: ===================================================================
yann@1: RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/sh/sysdep.h,v
yann@1: retrieving revision 1.9
yann@1: retrieving revision 1.10
yann@1: diff -u -r1.9 -r1.10
yann@1: --- libc/sysdeps/unix/sysv/linux/sh/sysdep.h	2003/09/01 04:05:21	1.9
yann@1: +++ libc/sysdeps/unix/sysv/linux/sh/sysdep.h	2003/10/15 04:36:32	1.10
yann@1: @@ -183,6 +183,13 @@
yann@1:  # endif	/* _LIBC_REENTRANT */
yann@1:  #endif	/* PIC */
yann@1:  
yann@1: +# ifdef NEED_SYSCALL_INST_PAD
yann@1: +#  define SYSCALL_INST_PAD \
yann@1: +	or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
yann@1: +# else
yann@1: +#  define SYSCALL_INST_PAD
yann@1: +# endif
yann@1: +
yann@1:  #define SYSCALL_INST0	trapa #0x10
yann@1:  #define SYSCALL_INST1	trapa #0x11
yann@1:  #define SYSCALL_INST2	trapa #0x12
yann@1: @@ -195,19 +202,13 @@
yann@1:  #define DO_CALL(syscall_name, args)	\
yann@1:      mov.l 1f,r3;			\
yann@1:      SYSCALL_INST##args;			\
yann@1: +    SYSCALL_INST_PAD;			\
yann@1:      bra 2f;				\
yann@1:       nop;				\
yann@1:      .align 2;				\
yann@1:   1: .long SYS_ify (syscall_name);	\
yann@1:   2:
yann@1:  
yann@1: -# ifdef NEED_SYSCALL_INST_PAD
yann@1: -#  define SYSCALL_INST_PAD \
yann@1: -	or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
yann@1: -# else
yann@1: -#  define SYSCALL_INST_PAD
yann@1: -# endif
yann@1: -
yann@1:  #else /* not __ASSEMBLER__ */
yann@1:  
yann@1:  #define SYSCALL_INST_STR0	"trapa #0x10\n\t"