BMC/Intel-BMC/linux.git/arch/tile/lib/exports.c, branch dev

tile: improve stack backtrace

2015-05-11T15:22:40+00:00

This commit fixes a number of issues with the tile backtrace code. - Don't try to identify userspace shared object or executable paths if we are doing a backtrace from an interrupt; it's not legal, and also unlikely to be interesting. Likewise, don't try to do it for other address spaces, since d_path() assumes it is being called in "current" context. - Move "in_backtrace" from thread_struct to thread_info. This way we can access it even if our stack thread_info has been clobbered, which makes backtracing more robust. - Avoid using "current" directly when testing for is_sigreturn(). Since "current" may be corrupt, we're better off using kbt->task explicitly to look up the vdso_base for the current task. Conveniently, this simplifies the internal APIs (we only need one is_sigreturn() function now). - Avoid bogus "Odd fault" warning when pc/sp/ex1 are all zero, as is true for kernel threads above the last frame. - Hook into Tejun Heo's dump_stack() framework in lib/dump_stack.c. - Write last entry in save_stack_trace() as ULONG_MAX, not zero, since ftrace (at least) relies on finding that marker. - Implement save_stack_trace_regs() and save_strack_trace_user(), and set CONFIG_USER_STACKTRACE_SUPPORT. Signed-off-by: Chris Metcalf

tile: add and enable support functions

2015-04-30T19:23:37+00:00

This change enables the generic strncpy_from_user() and strnlen_user() using word-at-a-time.h. The tile implementation is trivial since both tilepro and tilegx have SIMD operations that do byte-wise comparisons against immediate zero for each byte, and return an 0x01 byte in each position where there is a 0x00 byte. Signed-off-by: Chris Metcalf

tile: support ftrace on tilegx

2013-08-30T14:20:13+00:00

This commit adds support for static ftrace, graph function support, and dynamic tracer support. Signed-off-by: Tony Lu Signed-off-by: Chris Metcalf

tile: convert uses of "inv" to "finv"

2013-07-31T15:51:19+00:00

The "inv" (invalidate) instruction is generally less safe than "finv" (flush and invalidate), as it will drop dirty data from the cache. It turns out we have almost no need for "inv" (other than for the older 32-bit architecture in some limited cases), so convert to "finv" where possible and delete the extra "inv" infrastructure. Signed-off-by: Chris Metcalf

tilepro: work around module link error with gcc 4.7

2013-06-15T20:47:47+00:00

gcc 4.7.x is emitting calls to __ffsdi2 where previously it used to inline the appropriate ctz instructions. While this needs to be fixed in gcc, it's also easy to avoid having it cause build failures when building with those compilers by exporting __ffsdi2 to modules. Signed-off-by: Chris Metcalf Cc: stable@kernel.org

tile: export a handful of symbols appropriately

2013-02-08T18:20:36+00:00

This was shown up by running with "allmodconfig". I used EXPORT_SYMBOL() to match existing conventions in files that were already exporting symbols, or that were exported that way by other architectures, and otherwise EXPORT_SYMBOL_GPL(). Signed-off-by: Chris Metcalf

arch/tile: optimize get_user/put_user and friends

2012-05-25T16:48:23+00:00

Use direct load/store for the get_user/put_user. Previously, we would call out to a helper routine that would do the appropriate thing and then return, handling the possible exception internally. Now we inline the load or store, along with a "we succeeded" indication in a register; if the load or store faults, we write a "we failed" indication into the same register and then return to the following instruction. This is more efficient and gives us more compact code, as well as being more in line with what other architectures do. The special futex assembly source file for TILE-Gx also disappears in this change; we just use the same inlining idiom there as well, putting the appropriate atomic operations directly into futex_atomic_op_inuser() (and thus into the FUTEX_WAIT function). The underlying atomic copy_from_user, copy_to_user functions were renamed using the (cryptic) x86 convention as copy_from_user_ll and copy_to_user_ll. Signed-off-by: Chris Metcalf

arch/tile: add a few #includes and an EXPORT to catch up with kernel changes.

2011-12-03T20:31:41+00:00

The empty_zero_page[] export is required for ZERO_PAGE() module references. The #includes are due to changes in implicit inclusion, and should of course have been in the sources from the beginning. Signed-off-by: Chris Metcalf

arch/tile: avoid exporting a symbol no longer used by gcc

2011-11-03T20:58:42+00:00

An earlier Tilera compiler generated calls to an "__ll_mul" function for long long multiplication. Our libgcc supported that as an alias for the normal __muldi3 routine, so we made it available to kernel modules as well. However, for a while now the compiler has internally been generating only the standard __muldi3 symbol, and the version we are giving back to the community does not have the __ll_mul alias, so we are removing it from the kernel too. Signed-off-by: Chris Metcalf

arch/tile: export some additional module symbols

2011-03-01T21:21:12+00:00

This adds a grab bag of symbols that have been missing for various modules. Signed-off-by: Chris Metcalf