kernel.git/arch/powerpc/kernel/vdso64, branch linux-2.6.28.y

powerpc: Fixup lwsync at runtime

2008-07-03T06:58:10Z

To allow for a single kernel image on e500 v1/v2/mc we need to fixup lwsync at runtime. On e500v1/v2 lwsync causes an illop so we need to patch up the code. We default to 'sync' since that is always safe and if the cpu is capable we will replace 'sync' with 'lwsync'. We introduce CPU_FTR_LWSYNC as a way to determine at runtime if this is needed. This flag could be moved elsewhere since we dont really use it for the normal CPU_FTR purpose. Finally we only store the relative offset in the fixup section to keep it as small as possible rather than using a full fixup_entry. Signed-off-by: Kumar Gala Signed-off-by: Paul Mackerras

powerpc: Introduce infrastructure for feature sections with alternatives

2008-07-01T01:28:28Z

The current feature section logic only supports nop'ing out code, this means if you want to choose at runtime between instruction sequences, one or both cases will have to execute the nop'ed out contents of the other section, eg: BEGIN_FTR_SECTION or 1,1,1 END_FTR_SECTION_IFSET(FOO) BEGIN_FTR_SECTION or 2,2,2 END_FTR_SECTION_IFCLR(FOO) and the resulting code will be either, or 1,1,1 nop or, nop or 2,2,2 For small code segments this is fine, but for larger code blocks and in performance criticial code segments, it would be nice to avoid the nops. This commit starts to implement logic to allow the following: BEGIN_FTR_SECTION or 1,1,1 FTR_SECTION_ELSE or 2,2,2 ALT_FTR_SECTION_END_IFSET(FOO) and the resulting code will be: or 1,1,1 or, or 2,2,2 We achieve this by extending the existing FTR macros. The current feature section semantic just becomes a special case, ie. if the else case is empty we nop out the default case. The key limitation is that the size of the else case must be less than or equal to the size of the default case. If the else case is smaller the remainder of the section is nop'ed. We let the linker put the else case code in with the rest of the text, so that relative branches from the else case are more likley to link, this has the disadvantage that we can't free the unused else cases. This commit introduces the required macro and linker script changes, but does not enable the patching of the alternative sections. We also need to update two hand-made section entries in reg.h and timex.h Signed-off-by: Michael Ellerman Signed-off-by: Paul Mackerras

[POWERPC] Tweak VDSO linker script to avoid upsetting old binutils

2008-05-23T05:27:23Z

This works around bugs in older binutils' objcopy. The placement of these sections does not really matter, but it confused the buggy old BFD libraries. Signed-off-by: Roland McGrath Signed-off-by: Paul Mackerras

[POWERPC] vdso: Fixes for cache block sizes

2007-11-20T02:56:31Z

The current VDSO implementation is hardcoded to 128 byte cache blocks, which are only used on IBM's 64-bit processors. Convert it to get the cache block sizes out of vdso_data instead, similar to how the ppc64 in-kernel cache flush does it. Signed-off-by: Olof Johansson Signed-off-by: Paul Mackerras

[POWERPC] Fix 64 bits vDSO DWARF info for CR register

2007-10-17T12:30:09Z

The current DWARF info for CR are incorrect, causing the gcc unwinder to go to lunch if we take a segfault in the vdso. This fixes it. Problem identified by Andrew Haley, and fix provided by Jakub Jelinek (thanks !). Unfortunately, a bug in gcc cause it to not quite work either, but that is being fixed separately with something around the lines of: linux-unwind.h: fs->regs.reg[R_CR2].loc.offset = (long) ®s->ccr - new_cfa; + /* CR? regs are just 32-bit and PPC is big-endian. */ + fs->regs.reg[R_CR2].loc.offset += sizeof (long) - 4; (According to Jakub) Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras

powerpc64 vDSO: linker script indentation

2007-10-16T17:01:50Z

This cleans up the formatting in the vDSO linker script, mostly just the use of whitespace. It's intended to approximate the kernel standard conventions for indenting C, treating elements of the linker script about like initialized variable definitions. Signed-off-by: Roland McGrath Acked-by: Benjamin Herrenschmidt Cc: Sam Ravnborg Signed-off-by: Linus Torvalds

[POWERPC] Update .gitignore for new vdso generated files

2007-10-08T13:38:12Z

We now generate vdso[32,64].so.dbg as part of the build so add them to .gitignore Signed-off-by: Kumar Gala

[POWERPC] powerpc vDSO: install unstripped copies on disk

2007-10-03T02:02:43Z

This keeps an unstripped copy of the vDSO images built before they are stripped and embedded in the kernel. The unstripped copies get installed in $(MODLIB)/vdso/ by "make install". These files can be useful when they contain source-level debugging information. Signed-off-by: Roland McGrath Cc: Sam Ravnborg Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Paul Mackerras

Fix VDSO gettimeofday() when called with NULL struct timeval.

2007-06-30T04:27:00Z

The vdso64 portion of patch 74609f4536f2b8fd6a48381bbbe3cd37da20a527 for fixing problems with NULL gettimeofday input mistakenly checks for a null tz field twice, when it should be checking for null tz once, and null tv once; by way of a r10/r11 typo. Any application calling gettimeofday(&tv,NULL) will "fail". This corrects that typo, and makes my G5 happy. Tested on G5. Signed-off-by: Will Schmidt Cc: Tony Breeds Forwarded-by: Ben Herrenschmidt [ Ben says: "I checked the 32 bits part of the change is correct. You can probably blame me for originally writing the 2 versions with inversed usage of r10 and r11, thus confusing Tony :-)" Ben duly blamed. - Linus ] Signed-off-by: Linus Torvalds

[POWERPC] Fix VDSO gettimeofday() when called with NULL struct timeval

2007-06-26T04:41:19Z

Consider the prototype for gettimeofday(): int gettimofday(struct timeval *tv, struct timezone *tz); Although it is valid to call with /either/ tv or tz being NULL, and the C version of sys_gettimeofday() supports this, the current version of gettimeofday() in the VDSO will SEGV if called with a NULL tv. This adds a check for tv being NULL so that it doesn't SEGV. Signed-off-by: Tony Breeds Acked-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras