On linux-queue, malta doesn't build after the include file relocation.
This should fix it.
There some occurrences of 'asm-mips' in the comments of quite a few
files, but this is the only place I found it in any code.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This is the final part of the watch register patch. Here we hook up
ptrace so that the user space debugger (gdb), can set and read the
registers.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Here we hook up the scheduler. Whenever we switch to a new process,
we check to see if the watch registers should be installed, and do it
if needed.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Here we hook up the watch exception handler so that it sends SIGTRAP when
the hardware watch registers are triggered.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Probe for watch register characteristics, and report them in /proc/cpuinfo.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This is the main support code for the patch. Here we just add the
code, the following patches hook it up.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
create mode 100644 arch/mips/include/asm/watch.h
create mode 100644 arch/mips/kernel/watch.c
This is automatically set for all MIPS32 and MIPS64 processors.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
The third operand to 'ins' must be a constant int, not a register.
[Ralf: The bug was actually intensional. Some versions used to throw an
error under certain circumstances for code like:
static inline void f(unsigned nr, unsigned *p)
{
unsigned short bit = nr & 5;
if (__builtin_constant_p(bit)) {
__asm__ __volatile__ (" foo %0, %1" : "=m" (*p) : "i" (bit));
} else {
/* Do something else. */
}
}
because gcc was not able to figure out that the "i" constraint was possibly
at the early stage when the constraint are getting verified. The solution
was using "ri" instead of "i". The "ri" would keep gcc happy but in the
end for code generation always the "i" constraint would be satisfied. The
problem afair originally appeared in the i386 io.h and also hit it's mips
equivalent. From there the workaround spread to many of the inline
assembler functions.]
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Mmap with MAP_FIXED was not validating the addr and len parameters. This
leads to the failure of GCC's gcc.c-torture/execute/loop-2[fg].c testcases
when using the o32 ABI on a 64 bit kernel.
These testcases try to mmap 65536 bytes at 0x7fff8000 and then access all
the memory. In 2.6.18 and 2.6.23.1 (and likely other versions as well)
the kernel maps the requested memory, but since half of it is above
0x80000000 a SIGBUS is generated when it is accessed.
This patch moves the len validation above the MAP_FIXED processing so that
it is always validated. It also adds validation to the addr parameter for
MAP_FIXED mappings.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
David Daney