linux/arch/microblaze/kernel/hw_exception_handler.S, branch v2.6.38Linux kernel source treehttps://git.amat.us/linux/atom/arch/microblaze/kernel/hw_exception_handler.S?h=v2.6.382011-01-28T13:05:00Zmicroblaze: Fix unaligned issue on MMU system with BS=0 DIV=12011-01-28T13:05:00ZMichal Simekmonstr@monstr.eu2011-01-28T12:14:58Zurn:sha1:9c749e177ccc0b3ee9589425c7255079e7a726fc
Unaligned code use shift for finding register operand.
There is used BSRLI(r8,r8,2) macro which is expand for BS=0, DIV=1
by
ori rD, r0, (1 << imm); \
idivu rD, rD, rA
but if rD is equal rA then ori instruction rewrite value which
should be devide.
The patch remove this macro which use idivu instruction because
idivu takes 32/34 cycles. The highest shifting is 20 which takes
20 cycles.
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Fix unaligned exception for little endian platform2011-01-03T09:08:29ZMichal Simekmonstr@monstr.eu2010-12-29T13:34:46Zurn:sha1:e3288f310111f7d18c323d95ae998765dee8c825
Half word unaligned accesses need to be fixed.
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Add stack unwinder2010-08-04T08:22:35ZSteven J. Magnanisteve@digidescorp.com2010-04-27T17:37:54Zurn:sha1:ce3266c047389443d5f433d605c769e878cbe46e
Implement intelligent backtracing by searching for stack frame creation,
and emitting only return addresses. Use print_hex_dump() to display the
entire binary kernel stack.
Limitation: MMU kernels are not currently able to trace beyond a system trap
(interrupt, syscall, etc.). It is the intent of this patch to provide
infrastructure that can be extended to add this capability later.
Changes from V1:
* Removed checks in find_frame_creation() that prevented location of the frame
creation instruction in heavily optimized code
* Various formatting/commenting/file location tweaks per review comments
* Dropped Kconfig option to enable STACKTRACE as something logically separate
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
microblaze: Use instruction with delay slot2010-04-01T06:38:23ZMichal Simekmonstr@monstr.eu2010-03-22T19:43:27Zurn:sha1:3765d6958dfff34a15588e23c5d1274e1f6ba200
Sync labels.
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Remove additional resr and rear loading2010-04-01T06:38:23ZMichal Simekmonstr@monstr.eu2010-03-19T11:50:35Zurn:sha1:bd1637d63e82aaf732ffbe907ba887fa12e82df4
RESR and REAR uses the same regs in whole file.
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Change register usage for ESR and EAR2010-04-01T06:38:23ZMichal Simekmonstr@monstr.eu2010-03-19T11:44:40Zurn:sha1:b175bcfe31cba846d8bfa35a3a4820667f7af383
This change synchronize register usage in code.
ESR = R4
EAR = R3
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Prepare work for optimization in exception code2010-04-01T06:38:23ZMichal Simekmonstr@monstr.eu2010-03-22T19:37:23Zurn:sha1:7a6bbdc9304b45cc759e03623cbe63d81aff7337
Any sync branch must follow mts instructions not mfs.
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Add DEBUG option2010-04-01T06:38:23ZMichal Simekmonstr@monstr.eu2010-03-18T06:23:04Zurn:sha1:708e7153d6fc4d2e5fe15c6ccc5d2907fe8a9c8d
Disable debug option in asm code.
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Clear sticky FSR register after saving it to func parametr2009-10-05T09:37:47ZMichal Simekmonstr@monstr.eu2009-09-28T06:50:53Zurn:sha1:131e4e97bfee809dc64febe8accef2f042a92722
Previous patch d63678d607d0e37ec7abe5ceb545d7e8aab956a4 clear
it for noMMU kernel. This one do it for MMU.
Correct noMMU version
Signed-off-by: Michal Simek <monstr@monstr.eu>
microblaze: Clear sticky FSR register after generating exception signals2009-09-22T08:00:42ZJohn Williamsjohn.williams@petalogix.com2009-09-15T02:29:55Zurn:sha1:71b23d547b5a06f49acacaf742ebf1a85673f8d1
FSR is sticky, so after the userspace exception/signal generation, clear
it ready for next time.
Signed-off-by: John Williams <john.williams@petalogix.com>