linux.git/include/asm-mips/compat.h, branch master

MIPS: Move headfiles to new location below arch/mips/include

2008-10-11T15:18:52+00:00

Signed-off-by: Ralf Baechle

asm-*/compat.h: fix typo in comment

2008-02-03T14:32:51+00:00

Signed-off-by: Marcin Ślusarz 
Signed-off-by: Adrian Bunk

Introduce compat_u64 and compat_s64 types

2007-07-16T16:05:48+00:00

One common problem with 32 bit system call and ioctl emulation is the
different alignment rules between i386 and 64 bit machines.  A number of
drivers work around this by marking the compat structures as
'attribute((packed))', which is not the right solution because it breaks
all the non-x86 architectures that want to use the same compat code.

Hopefully, this patch improves the situation, it introduces two new types,
compat_u64 and compat_s64.  These are defined on all architectures to have
the same size and alignment as the 32 bit version of u64 and s64.

Signed-off-by: Arnd Bergmann 
Acked-by: David S. Miller 
Cc: David Woodhouse 
Cc: Andi Kleen 
Cc: Benjamin Herrenschmidt 
Cc: Vasily Tarasov 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[MIPS] Workaround for a sparse warning in include/asm-mips/compat.h

2007-07-13T16:40:01+00:00

Cast to a __user pointer via "unsigned long" to get rid of this warning:

include2/asm/compat.h:135:10: warning: cast adds address space to expression ()

Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle

[MIPS] compat.h uses struct pt_regs so needs to include ptrace.h.

2006-12-12T01:46:24+00:00

Signed-off-by: Ralf Baechle

[MIPS] Use SYSVIPC_COMPAT to fix various problems on N32

2006-12-04T22:43:12+00:00

N32 SysV IPC system calls should use 32-bit compatible code.
arch/mips/kernel/linux32.c have similar compatible code for O32, but
ipc/compat.c seems more complete.  We can use it for both N32 and O32.

This patch should fix these problems (and other possible problems):

http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=1149188824.6986.6.camel%40diimka-laptop
http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=44C6B829.8050508%40caviumnetworks.com

Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle

[PATCH] N32 sigset and __COMPAT_ENDIAN_SWAP__

2006-06-25T17:01:15+00:00

I'm testing glibc on MIPS64, little-endian, N32, O32 and N64 multilibs.

Among the NPTL test failures seen are some arising from sigsuspend problems
for N32: it blocks the wrong signals, so SIGCANCEL (SIGRTMIN) is blocked
despite glibc's carefully excluding it from sets of signals to block.
Specifically, testing suggests it blocks signal N^32 instead of signal N,
so (in the example tested) blocking SIGUSR1 (17) blocks signal 49 instead.

glibc's sigset_t uses an array of unsigned long, as does the kernel.
In both cases, signal N+1 is represented as
(1UL << (N % (8 * sizeof (unsigned long)))) in word number
(N / (8 * sizeof (unsigned long))).

Thus the N32 glibc uses an array of 32-bit words and the N64 kernel uses an
array of 64-bit words.  For little-endian, the layout is the same, with
signals 1-32 in the first 4 bytes, signals 33-64 in the second, etc.; for
big-endian, userspace has that layout while in the kernel each 8 bytes have
the two halves swapped from the userspace layout.

The N32 sigsuspend syscall uses sigset_from_compat to convert the userspace
sigset to kernel format.  If __COMPAT_ENDIAN_SWAP__ is *not* set, this uses
logic of the form

  set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 )

to convert the userspace sigset to a kernel one.  This looks correct to me
for both big and little endian, given that in userspace compat->sig[1] will
represent signals 33-64, and so will the high 32 bits of set->sig[0] in the
kernel.  If however __COMPAT_ENDIAN_SWAP__ *is* set, as it is for
__MIPSEL__, it uses

  set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );

which seems incorrect for both big and little endian, and would
explain the observed symptoms.

This code is the only use of __COMPAT_ENDIAN_SWAP__, so if incorrect
then that macro serves no purpose, in which case something like the
following patch would seem appropriate to remove it.

Signed-off-by: Joseph Myers 
Signed-off-by: Ralf Baechle 
Cc: Arnd Bergmann 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mips: add ptr_to_compat()

2006-03-27T16:44:49+00:00

Add ptr_to_compat() - needed by the new robust futex code.

Signed-off-by: Ingo Molnar 
Cc: Ralf Baechle 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[MIPS] Further sparsification for 32-bit compat code.

2006-03-21T13:27:46+00:00

    
Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle

2.6.14-rc1 updates for MIPS compat types.

2005-10-29T18:32:40+00:00

Signed-off-by: Ralf Baechle