path: root/arch/parisc/kernel/entry.S
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2011-04-15[PARISC] only make executable areas executableJames Bottomley1-0/+3
Currently parisc has the whole kernel marked as RWX, meaning any kernel page at all is eligible to be executed. This can cause a theoretical problem on systems with combined I/D TLB because the act of referencing a page causes a TLB insertion with an executable bit. This TLB entry may be used by the CPU as the basis for speculating the page into the I-Cache. If this speculated page is subsequently used for a user process, there is the possibility we will get a stale I-cache line picked up as the binary executes. As a point of good practise, only mark actual kernel text pages as executable. The same has to be done for init_text pages, but they're converted to data pages (and the I-Cache flushed) when the init memory is released. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-03-31Fix common misspellingsLucas De Marchi1-5/+5
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-01-15eliminate special FLUSH flag from page tableJames Bottomley1-58/+3
This was used to flush a region even if the page table entry had been cleared. In theory this was never necessary, but now we've switched to alias based flushing, the whole set of code associated with it can be dumped. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-01-15parisc: flush pages through tmpalias spaceJames Bottomley1-52/+142
The kernel has an 8M tmpailas space (originally designed for copying and clearing pages but now only used for clearing). The idea is to place zeros into the cache above a physical page rather than into the physical page and flush the cache, because often the zeros end up being replaced quickly anyway. We can also use the tmpalias space for flushing a page. The difference here is that we have to do tmpalias processing in the non access data and instruction traps. The principle is the same: as long as we know the physical address and have a virtual address congruent to the real one, the flush will be effective. In order to use the tmpalias space, the icache miss path has to be enhanced to check for the alias region to make the fic instruction effective. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-05-30parisc: Remove unnecessary macros from entry.SJohn David Anglin1-33/+7
The EXTR, DEP and DEPI macros are unnecessary. There are PA 1.X pneumonics available with the same functionality, and the DEP and DEPI macros conflict with assembler pneumonics. Tested on a variety of 32 and 64-bit systems. Signed-off-by: John David Anglin <dave.anglin@nrc-cnrc.gc.ca> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2010-05-30parisc: Delete unnecessary nop's in entry.SJohn David Anglin1-7/+0
Signed-off-by: John David Anglin <dave.anglin@nrc-cnrc.gc.ca> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2010-05-30parisc: Avoid interruption in critical region in entry.SJohn David Anglin1-2/+3
Signed-off-by: John David Anglin <dave.anglin@nrc-cnrc.gc.ca> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2009-09-27parisc: stop using task->ptrace for {single,block}step flagsKyle McMartin1-10/+11
task->ptrace flags belong to generic code, so instead thief some TIF_ bits to use. Somewhat risky conversion of code to test TASK_FLAGS instead of TASK_PTRACE in assembly, but it looks alright in the end. Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2009-09-02KEYS: Extend TIF_NOTIFY_RESUME to (almost) all architectures [try #6]David Howells1-1/+1
Implement TIF_NOTIFY_RESUME for most of those architectures in which isn't yet available, and, whilst we're at it, have it call the appropriate tracehook. After this patch, blackfin, m68k* and xtensa still lack support and need alteration of assembly code to make it work. Resume notification can then be used (by a later patch) to install a new session keyring on the parent of a process. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> cc: linux-arch@vger.kernel.org Signed-off-by: James Morris <jmorris@namei.org>
2009-08-02parisc: Set correct bit in protection flagsJohn David Anglin1-1/+1
Signed-off-by: John David Anglin <dave@hiauly1.hia.nrc.ca> Signed-off-by: Helge Deller <deller@gmx.de>
2009-03-31parisc: add ftrace (function and graph tracer) functionalityHelge Deller1-0/+27
This patch adds the ftrace debugging functionality to the parisc kernel. It will currently only work with 64bit kernels, because the gcc options -pg and -ffunction-sections can't be enabled at the same time and -ffunction-sections is still needed to be able to link 32bit kernels. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2009-03-31parisc: allow to build with 16k default kernel page sizeHelge Deller1-8/+17
Introduce new convert_for_tlb_insert20 macro and use it to replace assembler statements with hardcoded constants. This change allows the parisc64 kernel to boot with 16kb default kernel page size, aka CONFIG_PARISC_PAGE_SIZE_16KB=y. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2009-03-31parisc: use constants instead of numbers in assemblyHelge Deller1-4/+4
A few small fixups: * _PAGE_SIZE_ENCODING_DEFAULT is wrong here, as one might assume that it's possible to define the page size that way. This is wrong. Use 0 instead. * use constants instead of hardcoded numerical values in depi and extru while building the PFN out of the pte entry * use SHRREG instead of extru (iitlba expects the PFN at bits {7..26}) Still wondering why we can use the same register (pte) as extru source and target register, but it seems to work on PA1.1 and PA2.0... Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2009-03-13parisc: add braces around arguments in assembler macrosHelge Deller1-3/+3
Add braces around the macro arguments, else for example "shl %r1, 5-3, %r2" would not expand to what you would assume. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2008-06-13Revert "parisc: fix trivial section name warnings"Kyle McMartin1-2/+1
This reverts commit bd3bb8c15b9a80dbddfb7905b237a4a11a4725b4. Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2008-05-15parisc: use conditional macro for 64-bit wide opsKyle McMartin1-27/+19
This work enables us to remove -traditional from $AFLAGS on parisc. Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2008-05-15parisc: fix trivial section name warningsHelge Deller1-1/+2
This trivial patch fixes the following section warnings on PARISC: > WARNING: vmlinux.o (.text.1): unexpected section name. >The (.[number]+) following section name are ld generated and not expected. > Did you forget to use "ax"/"aw" in a .S file? > Note that for example <linux/init.h> contains > section definitions for use in .S files. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2007-10-18[PARISC] Kill off broken irqstack codeKyle McMartin1-34/+3
It's been unfinished and broken long enough, and I have some ideas on how to do it more cleanly. Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2007-10-18[PARISC] Remove hardcoded uses of PAGE_SIZEKyle McMartin1-2/+2
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2007-05-30[PARISC] fix "reduce size of task_struct on 64-bit machines" falloutKyle McMartin1-3/+2
Amazingly, parisc was the only arch effected by this... Convert register-sized loads/stores to always be 32-bit for these fields. Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2007-05-30[PARISC] remove remnants of parisc-specific softirq codeGrant Grundler1-34/+1
Kyle, This patch removes remnants of softirq support that we no longer need. I suspect this was just overlooked when willy convert parisc to generic IRQ support. Tested on c3600 32-bit UP. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> [and tested on a c8000 64-bit SMP --kyle] Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2007-02-17[PARISC] do not export get_register/set_registerHelge Deller1-4/+2
- noticed by Randolph Chung (tausq) Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2007-02-17[PARISC] implement standard ENTRY(), END() and ENDPROC()Helge Deller1-48/+47
Use the macros in entry.S Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2007-02-17[PARISC] use less assembler statements in syscall pathHelge Deller1-8/+5
Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2007-02-17[PARISC] Add TIF_RESTORE_SIGMASK supportKyle McMartin1-83/+58
And unmask the pselect6/ppoll system calls. Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2007-02-17[PARISC] a and b in "break a,b" message were swappedHelge Deller1-10/+6
And clean up 32/64bit branch assembler statements Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2006-10-04[PARISC] [BUGFIX] nullify branch delay slot of the jump back toKyle McMartin1-1/+1
intr_restore in intr_do_preempt. This prevents the execution of an unwanted insn... Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2006-10-04[PARISC] Abstract shift register left in .SKyle McMartin1-15/+4
Abstract existing shift register left macros as shift register right are. This lends itself to a nice clean up of some #ifdef blocks in entry.S Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2006-10-03Attack of "the the"s in archMatt LaPlante1-2/+2
The patch below corrects multiple occurances of "the the" typos across several files, both in source comments and KConfig files. There is no actual code changed, only text. Note this only affects the /arch directory, and I believe I could find many more elsewhere. :) Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30Remove obsolete #include <linux/config.h>Jörn Engel1-1/+0
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-27[PARISC] Ensure all ldcw uses are ldcw,co on pa2.0Kyle McMartin1-3/+3
ldcw,co should always be used on pa2.0, otherwise the strict cache width alignment requirement is not relaxed. Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2006-04-21[PARISC] Further work for multiple page sizesHelge Deller1-14/+22
More work towards supporing multiple page sizes on 64-bit. Convert some assumptions that 64bit uses 3 level page tables into testing PT_NLEVELS. Also some BUG() to BUG_ON() conversions and some cleanups to assembler. Signed-off-by: Helge Deller <deller@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2006-03-30[PARISC] Add PREEMPT supportKyle McMartin1-3/+36
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2006-03-30[PARISC] Fix IOREMAP with a 64-bit kernelHelge Deller1-3/+3
We were only copying 32-bits of the PTE/PFN, not the full 52-bits. Signed-off-by: Helge Deller <deller@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-11-17[PARISC] Document some register usages in assembly filesCarlos O'Donell1-0/+1
Document clobbers and args in entry.S and syscall.S. entry.S: Add comment to indicate that cr27 may recycle and EDEADLOCK detection is not 100% correct. Since this is only enabled when using ENABLE_LWS_DEBUG, the user is warned by the comment. Signed-off-by: Carlos O'Donell <carlos@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-10-21[PARISC] Remove the spurious do_softirq calls from entry.SJames Bottomley1-27/+0
remove the spurious do_softirq calls from entry.S With these in we were calling do_softirq twice; plus the calls in entry.S took no account of nesting. Signed-off-by: James Bottomley <jejb@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-10-21[PARISC] Fix the alloc_slabmgmt panicJames Bottomley1-0/+2
Fix the alloc_slabmgmt panic Hopefully this should also fix a lot of other intermittent kernel bugs. The problem has been around since 2.6.9-rc2-pa6 when we allowed floating point registers to be used in kernel code. The essence of the problem is that gcc prefers to use floating point for integer divides and multiples. Further, it can rely on the values in the no clobber fp regs being correct across a function call. Unfortunately, our task switch function only saves the integer no clobber registers, not the fp ones, so if gcc makes a function call to any function in the kernel which could sleep, the values it is relying on in any no clobber floating point register may be lost. In the case of alloc_slabmgmt, the value of the page offset is being stored in %fr12 across a call to kmem_getpages(), which sleeps if no pages are available. Thus, the offset can be trashed and the slab code can end up with a completely bogus address leading to corruption. Kudos to Randolph who came up with the program to trip this problem at will and thus allowed it to be tracked and fixed. Signed-off-by: James Bottomley <jejb@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-10-21[PARISC] Replace uses of __LP64__ with CONFIG_64BITGrant Grundler1-49/+49
2.6.12-rc4-pa3 s/__LP64__/CONFIG_64BIT/ and fixup config.h usage Signed-off-by: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-10-21[PARISC] Replace some calls to bl with b,l or bv to use longer offsetsRandolph Chung1-3/+13
convert some bl calls to b,l or bv to use longer offsets Signed-off-by: Randolph Chung <tausq@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-10-21[PARISC] Make sure use of RFI conforms to PA 2.0 and 1.1 arch docsGrant Grundler1-27/+24
2.6.12-rc4-pa3 : first pass at making sure use of RFI conforms to PA 2.0 arch pages F-4 and F-5, PA 1.1 Arch page 3-19 and 3-20. The discussion revolves around all the rules for clearing PSW Q-bit. The hard part is meeting all the rules for "relied upon translation". .align directive is used to guarantee the critical sequence ends more than 8 instructions (32 bytes) from the end of page. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
2005-09-09kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h supportSam Ravnborg1-1/+1
Delete obsoleted parts form arch makefiles and rename to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2005-04-16Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds1-0/+2426
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!