Commit Graph

111 Commits

Author SHA1 Message Date
Ralf Baechle
ba3049ed40 MIPS: Switch FPU emulator trap to BREAK instruction.
Arguably using the address error handler has always been ugly.  But with
processors that handle unaligned loads and stores in hardware the
current mechanism ceases to work so switch it to a BREAK instruction and
allocate break code 514 to the FPU emulator.

Yoichi Yuasa provided a build fix for CONFIG_BUG=n.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
2008-10-30 14:44:34 +00:00
David Daney
566f74f6b2 MIPS: Consider value of c0_ebase when computing value of exception base.
It just so happens to be zero on all currently supported systems so this
hasn't bitten yet ...

[Ralf: Original patch from Cavium; handling of set_uncached_handler() and
de-ifdef'ed trap_init() implementation by me.]

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-10-30 14:44:33 +00:00
David Daney
b67b2b7030 MIPS: Watch exception handling for HARDWARE_WATCHPOINTS.
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>
2008-10-11 16:18:56 +01:00
Kevin D. Kissell
9cc123631b [MIPS] SMTC: Fix holes in SMTC and FPU affinity support.
Signed-off-by: Kevin D. Kissell <kevink@paralogos.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-10-03 17:58:58 +01:00
Atsushi Nemoto
c65a5480ff [MIPS] Fix potential latency problem due to non-atomic cpu_wait.
If an interrupt happened between checking of NEED_RESCHED and WAIT
instruction, adjust EPC to restart from checking of NEED_RESCHED.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-09-21 14:52:57 +02:00
Thomas Bogendoerfer
e0cee3eea7 [MIPS] Fix WARNING: at kernel/smp.c:290
trap_init issues flush_icache_range(), which uses ipi functions to
get icache flushing done on all cpus. But this is done before interrupts
are enabled and caused WARN_ON messages. This changeset introduces
a new local_flush_icache_range() and uses it before interrupts (and
additional CPUs) are enabled to avoid this problem.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-09-05 21:24:11 +01:00
Thomas Bogendoerfer
0510617b85 [MIPS] Fix data bus error recovery
With -ffunction-section the entries in __dbe_table aren't no longer
sorted, so the lookup of exception addresses in do_be() failed for
some addresses. To avoid this we now sort __dbe_table.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-09-05 21:24:11 +01:00
Jason Wessel
8854700115 [MIPS] kgdb: add arch support for the kernel's kgdb core
The new kgdb architecture specific handler registers and unregisters
dynamically for exceptions depending on when you configure a kgdb I/O
driver.

Aside from initializing the exceptions earlier in the boot process,
kgdb should have no impact on a device when it is compiled in so long
as an I/O module is not configured for use.

There have been quite a number of contributors during the existence of
this patch (see arch/mips/kernel/kgdb.c).  Most recently Jason
re-wrote the mips kgdb logic to use the die notification handlers.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-07-30 21:54:42 +01:00
Ralf Baechle
b012cffe7f [MIPS] Replace use of print_symbol with new %sP pointer format.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-07-15 18:44:33 +01:00
David Daney
cb11dfa024 [MIPS] Remove board_watchpoint_handler
It is not used anywhere in tree.

Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-07-15 18:44:29 +01:00
Thomas Bogendoerfer
10220c8844 [MIPS] Fix check for valid stack pointer during backtrace
The newly added check for valid stack pointer address breaks at least for
64bit kernels.  Use __get_user() for accessing stack content to avoid crashes,
when doing the backtrace.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-06-05 18:13:14 +01:00
Ralf Baechle
df2700519c [MIPS] Fix handling of trap and breakpoint instructions
With fixes and cleanups from Atsushi Nemoto (anemo@mba.ocn.ne.jp).

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-04-28 17:14:33 +01:00
Ralf Baechle
39b8d52542 [MIPS] Add support for MIPS CMP platform.
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-04-28 17:14:26 +01:00
Chris Dearman
bdc94eb41e [MIPS] Add noulri kernel argument to disable "rdhwr $29" usermode support.
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-04-28 17:14:26 +01:00
Ralf Baechle
234fcd1484 [MIPS] Fix loads of section missmatches
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-03-12 14:14:41 +00:00
Chris Dearman
1f5826bd0e [MIPS] Added missing cases for rdhwr emulation
Some of these are architecturally required for R2 processors so lets try
to be bit closer to the real thing.  This also provides access to the
CPU cycle timer, even on multiprocessors.  In that aspect its currently
bug compatible to what would happen on a R2-based SMP.

Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-03-12 14:14:40 +00:00
Chris Dearman
bbaf238b5f [MIPS] Ensure that ST0_FR is never set on a 32 bit kernel
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-12-14 17:34:30 +00:00
Ralf Baechle
f6771dbb27 [MIPS] Fix shadow register support.
Shadow register support would not possibly have worked on multicore
systems.  The support code for it was also depending not on MIPS R2 but
VSMP or SMTC kernels even though it makes perfect sense with UP kernels.

SR sets are a scarce resource and the expected usage pattern is that
users actually hardcode the register set numbers in their code.  So fix
the allocator by ditching it.  Move the remaining CPU probe bits into
the generic CPU probe.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-11-15 23:21:49 +00:00
Alexey Dobriyan
19c5870c0e Use helpers to obtain task pid in printks (arch code)
One of the easiest things to isolate is the pid printed in kernel log.
There was a patch, that made this for arch-independent code, this one makes
so for arch/xxx files.

It took some time to cross-compile it, but hopefully these are all the
printks in arch code.

Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19 11:53:43 -07:00
Ralf Baechle
42f77542f4 [MIPS] time: Move R4000 clockevent device code to separate configurable file
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-18 18:11:47 +01:00
Maciej W. Rozycki
60b0d65541 [MIPS] SYNC emulation for MIPS I processors
Userland, including the C library and the dynamic linker, is keen to use
the SYNC instruction, even for "generic" MIPS I binaries these days.
Which makes it less than useful on MIPS I processors.

This change adds the emulation, but as our do_ri() infrastructure was not
really prepared to take yet another instruction, I have rewritten it and
its callees slightly as follows.

Now there is only a single place a possible signal is thrown from.  The
place is at the end of do_ri().  The instruction word is fetched in
do_ri() and passed down to handlers.  The handlers are called in sequence
and return a result that lets the caller decide upon further processing.
If the result is positive, then the handler has picked the instruction,
but a signal should be thrown and the result is the signal number.  If the
result is zero, then the handler has successfully simulated the
instruction.  If the result is negative, then the handler did not handle
the instruction; to make it more obvious the calls do not follow the usual
0/-Exxx result convention they now return -1 instead of -EFAULT.

The calculation of the return EPC is now at the beginning.  The reason is
it is easier to handle it there as emulation callees may modify a register
and an instruction may be located in delay slot of a branch whose result
depends on the register.  It has to be undone if a signal is to be raised,
but it is not a problem as this is the slow-path case, and both actions
are done in single places now rather than the former being scattered
through emulation handlers.

The part of do_cpu() being covered follows the changes to do_ri().

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

---
2007-10-17 18:28:47 +01:00
Ralf Baechle
eae23f2c2a [MIPS] IP22: Fix warning.
CC      arch/mips/sgi-ip22/ip22-berr.o
arch/mips/sgi-ip22/ip22-berr.c: In function 'ip22_be_interrupt':
arch/mips/sgi-ip22/ip22-berr.c💯 warning: passing argument 2 of 'die_if_kernel' discards qualifiers from pointer target type

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-16 18:23:47 +01:00
Ralf Baechle
9966db25de [MIPS] Make facility to convert CPU types to strings generally available.
So far /proc/cpuinfo has been the only user but human readable processor
name are more useful than that for proc.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11 23:46:17 +01:00
Ralf Baechle
49a89efbbb [MIPS] Fix "no space between function name and open parenthesis" warnings.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11 23:46:15 +01:00
Ralf Baechle
10cc352907 [MIPS] Allow hardwiring of the CPU type to a single type for optimization.
This saves a few k on systems which only ever ship with a single CPU type.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11 23:46:15 +01:00
Ralf Baechle
641e97f318 [MIPS] Sibyte: Replace SB1 cachecode with standard R4000 class cache code.
It may not be perfect yet but the SB1 code is badly borken and has
horrible performance issues.

Downside: This seriously breaks support for pass 1 parts of the BCM1250
where indexed cacheops don't work quite reliable but I seem to be the
last one on the planet with a pass 1 part anyway.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11 23:46:05 +01:00
Ralf Baechle
ec70f65e3b [MIPS] Kill useless volatile keyword
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-10-11 23:46:03 +01:00
Thiemo Seufer
948a34cf39 [MIPS] Maintain si_code field properly for FP exceptions
The appended patch adds code to update siginfo_t's si_code field. It
fixes e.g. a floating point overflow regression in the SBCL testsuite.

Signed-off-By: Thiemo Seufer <ths@linux-mips.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-08-27 02:16:59 +01:00
Thiemo Seufer
34412c7231 [MIPS] SMTC: Fix duplicate status dumps on NMI
Also removes the while(1); loop by propagating the ATTRIB_NORET of die()
to nmi_exception_handler.

Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-08-27 02:16:59 +01:00
Ralf Baechle
293c5bd13f [MIPS] Fixup secure computing stuff.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-31 21:35:21 +01:00
Pavel Emelianov
bcdcd8e725 Report that kernel is tainted if there was an OOPS
If the kernel OOPSed or BUGed then it probably should be considered as
tainted.  Thus, all subsequent OOPSes and SysRq dumps will report the
tainted kernel.  This saves a lot of time explaining oddities in the
calltraces.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Added parisc patch from Matthew Wilson  -Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00
Atsushi Nemoto
e1bb828906 [MIPS] Make show_code static and add __user tag
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-13 17:40:01 +01:00
Atsushi Nemoto
5e0373b8e4 [MIPS] Add some __user tags
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-13 17:40:01 +01:00
Atsushi Nemoto
28fc582cc9 [MIPS] Sparse: Use NULL for pointer
This fixes a sparse warning:

arch/mips/kernel/traps.c:376:44: warning: Using plain integer as NULL pointer

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-12 17:41:20 +01:00
Marc St-Jean
9267a30d1d [MIPS] PMC MSP71xx mips common
Patch to add mips common support for the PMC-Sierra MSP71xx devices.

Signed-off-by: Marc St-Jean <Marc_St-Jean@pmc-sierra.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-10 17:33:03 +01:00
Ralf Baechle
a36920200c [MIPS] Enable support for the userlocal hardware register
Which will cut down the cost of RDHWR $29 which is used to obtain the
TLS pointer and so far being emulated in software down to a single cycle
operation.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-10 17:33:02 +01:00
Ralf Baechle
d223a86154 [MIPS] FP affinity: Coding style cleanups
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-10 17:33:02 +01:00
Atsushi Nemoto
b63e804459 [MIPS] Remove unused watchpoint support and arch/mips/lib-{32,64}
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-10 17:32:59 +01:00
Robert P. J. Day
b3f6df9f21 [MIPS] Transform old-style macros to newer "__noreturn"
Convert old/obsolete NORET_TYPE and ATTRIB_NORET macros to use the
newer standard of "__noreturn" as defined in compiler-gcc.h.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-10 17:32:56 +01:00
Chris Dearman
c3e838a2cb [MIPS] Fix timer/performance interrupt detection
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-06 16:17:11 +01:00
Ralf Baechle
3b1d4ed535 [MIPS] Don't drag a platform specific header into generic arch code.
For some platforms it's definitions may conflict.  So that's the one-liner.
The rest is 10 square kilometers of collateral damage fixup this include
used to paper over.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-06-20 22:27:10 +01:00
Ralf Baechle
6a05888d71 [MIPS] SMTC: The MT ASE requires to initialize c0_pagemask and c0_wired.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-06-11 18:20:54 +01:00
Ralf Baechle
8e8a52ed87 [MIPS] SMTC: Don't continue in set_vi_srs_handler on detected bad arguments.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-06-11 18:20:54 +01:00
Chris Dearman
acaec427bc [MIPS] Always install the DSP exception handler.
Some non-DSP enabled cores 24K / 34K can generate a DSP exception where they
are actually expected to produce a reserved instruction exception.

Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-06-11 18:20:53 +01:00
Atsushi Nemoto
6ba07e590d [MIPS] Fix warning by moving do_default_vi into CONFIG_CPU_MIPSR2_SRS
This fixes the warning:

arch/mips/kernel/traps.c:931: warning: 'do_default_vi' defined but not used

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-06-06 19:34:33 +01:00
Ralf Baechle
ef300e4223 [MIPS] Define and use vi_handler_t for vectored interrupt handlers.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-05-11 14:28:30 +01:00
Ralf Baechle
856a514b40 [MIPS] Fix do_default_vi to use get_irq_regs to get the irq register ptr.
Harmless bug because this function is only called in case of another
kernel bug anyway which is also why this was missed for so long.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-05-11 14:28:30 +01:00
Ralf Baechle
99af900aef [MIPS] Make do_default_vi static
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-05-11 14:28:30 +01:00
Randy Dunlap
e63340ae6b header cleaning: don't include smp_lock.h when not used
Remove includes of <linux/smp_lock.h> where it is not used/needed.
Suggested by Al Viro.

Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc,
sparc64, and arm (all 59 defconfigs).

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-08 11:15:07 -07:00
Atsushi Nemoto
ba755f8ec8 [MIPS] Fix BUG(), BUG_ON() handling
With commit 63dc68a8cf, kernel can not
handle BUG() and BUG_ON() properly since get_user() returns false for
kernel code.  Use __get_user() to skip unnecessary access_ok().  This
patch also make BRK_BUG code encoded in the TNE instruction.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-04-20 14:58:37 +01:00