linux-stable.git/arch/arm64/kernel/entry.S, branch v3.12 Linux kernel stable tree arm64: mm: permit use of tagged pointers at EL0 2013-09-03T09:18:02+00:00 Will Deacon will.deacon@arm.com 2013-06-12T15:28:04+00:00 d50240a5f6ceaf690a77b0fccb17be51cfa151c2 TCR.TBI0 can be used to cause hardware address translation to ignore the top byte of userspace virtual addresses. Whilst not especially useful in standard C programs, this can be used by JITs to `tag' pointers with various pieces of metadata. This patch enables this bit for AArch64 Linux, and adds a new file to Documentation/arm64/ which describes some potential caveats when using tagged virtual addresses. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
TCR.TBI0 can be used to cause hardware address translation to ignore the
top byte of userspace virtual addresses. Whilst not especially useful in
standard C programs, this can be used by JITs to `tag' pointers with
various pieces of metadata.

This patch enables this bit for AArch64 Linux, and adds a new file to
Documentation/arm64/ which describes some potential caveats when using
tagged virtual addresses.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: Enable interrupts in the EL0 undef handler 2013-08-22T10:47:37+00:00 Catalin Marinas catalin.marinas@arm.com 2013-08-22T10:47:37+00:00 2600e130b3c90c8d6c13229d3d3a14dcb898a87b do_undefinstr() has to be called with interrupts disabled since it may read the instruction from the user address space which could lead to a data abort and subsequent might_sleep() warning in do_page_fault(). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
do_undefinstr() has to be called with interrupts disabled since it may
read the instruction from the user address space which could lead to a
data abort and subsequent might_sleep() warning in do_page_fault().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: Change kernel stack size to 16K 2013-07-26T12:37:29+00:00 Feng Kan fkan@apm.com 2013-07-23T17:52:31+00:00 845ad05ec31e0f3872a321e10dbeaf872022632c Written by Catalin Marinas, tested by APM on storm platform. This is needed because of the failures encountered when running SpecWeb benchmark test. Signed-off-by: Feng Kan <fkan@apm.com> Acked-by: Kumar Sankaran <ksankaran@apm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
Written by Catalin Marinas, tested by APM on storm platform. This is needed
because of the failures encountered when running SpecWeb benchmark test.

Signed-off-by: Feng Kan <fkan@apm.com>
Acked-by: Kumar Sankaran <ksankaran@apm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: treat unhandled compat el0 traps as undef 2013-05-31T15:04:44+00:00 Mark Rutland mark.rutland@arm.com 2013-05-24T11:02:35+00:00 381cc2b9705512ee7c7f1839cbdde374625a2a9f Currently, if a compat process reads or writes from/to a disabled cp15/cp14 register, the trap is not handled by the el0_sync_compat handler, and the kernel will head to bad_mode, where it will die(), and oops(). For 64 bit processes, disabled system register accesses are currently treated as unhandled instructions. This patch modifies entry.S to treat these unhandled traps as undefined instructions, sending a SIGILL to userspace. This gives processes a chance to handle this and stop using inaccessible registers, and prevents further issues in the kernel as a result of the die(). Reported-by: Johannes Jensen <Johannes.Jensen@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
Currently, if a compat process reads or writes from/to a disabled
cp15/cp14 register, the trap is not handled by the el0_sync_compat
handler, and the kernel will head to bad_mode, where it will die(), and
oops(). For 64 bit processes, disabled system register accesses are
currently treated as unhandled instructions.

This patch modifies entry.S to treat these unhandled traps as undefined
instructions, sending a SIGILL to userspace. This gives processes a
chance to handle this and stop using inaccessible registers, and
prevents further issues in the kernel as a result of the die().

Reported-by: Johannes Jensen <Johannes.Jensen@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: add explicit symbols to ESR_EL1 decoding 2013-04-17T14:58:25+00:00 Marc Zyngier Marc.Zyngier@arm.com 2013-04-08T16:17:03+00:00 5c1ce6f7c2aae5329f667fb079b3198266d9a3fa The ESR_EL1 decoding process is a bit cryptic, and KVM has also a need for the same constants. Add a new esr.h file containing the appropriate exception classes constants, and change entry.S to use it. Fix a small bug in the EL1 breakpoint check while we're at it. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
The ESR_EL1 decoding process is a bit cryptic, and KVM has also
a need for the same constants.

Add a new esr.h file containing the appropriate exception classes
constants, and change entry.S to use it. Fix a small bug in the
EL1 breakpoint check while we're at it.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: switch to generic sigaltstack 2013-02-14T14:17:29+00:00 Al Viro viro@zeniv.linux.org.uk 2012-12-23T06:56:45+00:00 207bdae452e6d3eeba19cc3912e5dfb088adc376 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
arm64: move vector entry macro to assembler.h 2012-12-05T11:26:47+00:00 Marc Zyngier marc.zyngier@arm.com 2012-10-19T16:37:35+00:00 dc637f1fdaa6f335271a0341fef3914b80ab929c This macro is also useful to other bits defining vectors (hypervisor stub, KVM...). Move it to a common location. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
This macro is also useful to other bits defining vectors (hypervisor
stub, KVM...).

Move it to a common location.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: get rid of fork/vfork/clone wrappers 2012-10-22T22:14:17+00:00 Al Viro viro@zeniv.linux.org.uk 2012-10-18T04:55:54+00:00 e0fd18ce1169595df929373cad2ae9b00b2289c2 [fixes from Catalin Marinas folded] Acked-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
[fixes from Catalin Marinas folded]

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
arm64: Use generic sys_execve() implementation 2012-10-17T13:41:51+00:00 Catalin Marinas catalin.marinas@arm.com 2012-09-10T15:11:46+00:00 6a872777ffff6184f4ac10bd71d926d5e6f2491e This patch converts the arm64 port to use the generic sys_execve() implementation removing the arm64-specific (compat_)sys_execve_wrapper() functions. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
This patch converts the arm64 port to use the generic sys_execve()
implementation removing the arm64-specific (compat_)sys_execve_wrapper()
functions.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: Use generic kernel_execve() implementation 2012-10-17T13:35:04+00:00 Catalin Marinas catalin.marinas@arm.com 2012-09-10T15:11:46+00:00 59dc67b0cc35cd93c3f4869fdd0d6cfb2a26ecbc This patch enables CONFIG_GENERIC_KERNEL_EXECVE on arm64 and removes the arm64-specific implementation of kernel_execve(). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
This patch enables CONFIG_GENERIC_KERNEL_EXECVE on arm64 and removes the
arm64-specific implementation of kernel_execve().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>