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patches/glibc/2.3.2/glibc-2.3.2-sh4-trapa.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jul 01 19:04:20 2007 +0000 (2007-07-01)
changeset 182 223c84ec2d90
permissions -rw-r--r--
Merge the build system to trunk: ct-ng is now installable:
- ./configure --prefix=/some/place
- make
- make install
- export PATH="${PATH}:/some/place/bin"
- ct-ng <action> 
     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

     2 

     3 Ankur Sheth said:

     4 

     5 "This is actually a workaround for a bug in the sh4.  The actual bug is

     6 documented here :

     7 http://documentation.renesas.com/eng/products/mpumcu/tu/tnsh7456ae.pdf

     8 Basically the cache & TLB should not be accessed for 4 (or was it 5?) cycles

     9 after isssuing a TRAPA instruction.  I didn't run into any specific problem

    10 because of this bug, but it seems useful to have and the patch itself seems

    11 pretty harmless."

    12 

    13 

    14 ===================================================================

    15 RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/sh/sysdep.h,v

    16 retrieving revision 1.9

    17 retrieving revision 1.10

    18 diff -u -r1.9 -r1.10

    19 --- libc/sysdeps/unix/sysv/linux/sh/sysdep.h	2003/09/01 04:05:21	1.9

    20 +++ libc/sysdeps/unix/sysv/linux/sh/sysdep.h	2003/10/15 04:36:32	1.10

    21 @@ -183,6 +183,13 @@

    22  # endif	/* _LIBC_REENTRANT */

    23  #endif	/* PIC */

    24  

    25 +# ifdef NEED_SYSCALL_INST_PAD

    26 +#  define SYSCALL_INST_PAD \

    27 +	or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0

    28 +# else

    29 +#  define SYSCALL_INST_PAD

    30 +# endif

    31 +

    32  #define SYSCALL_INST0	trapa #0x10

    33  #define SYSCALL_INST1	trapa #0x11

    34  #define SYSCALL_INST2	trapa #0x12

    35 @@ -195,19 +202,13 @@

    36  #define DO_CALL(syscall_name, args)	\

    37      mov.l 1f,r3;			\

    38      SYSCALL_INST##args;			\

    39 +    SYSCALL_INST_PAD;			\

    40      bra 2f;				\

    41       nop;				\

    42      .align 2;				\

    43   1: .long SYS_ify (syscall_name);	\

    44   2:

    45  

    46 -# ifdef NEED_SYSCALL_INST_PAD

    47 -#  define SYSCALL_INST_PAD \

    48 -	or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0

    49 -# else

    50 -#  define SYSCALL_INST_PAD

    51 -# endif

    52 -

    53  #else /* not __ASSEMBLER__ */

    54  

    55  #define SYSCALL_INST_STR0	"trapa #0x10\n\t"
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