arm64: memtag: strip tag from crash dumps

The MTE tag is not really useful when displaying a crash dump. In fact
it makes it more complicated for tools like script/symbolize.py to
retrieve the actua

arm64: memtag: strip tag from crash dumps

The MTE tag is not really useful when displaying a crash dump. In fact
it makes it more complicated for tools like script/symbolize.py to
retrieve the actual (untagged) virtual address, especially as we now
support non-Arm architectures and therefore blindly stripping the MTE
bits is not possible.

This commit strips the tag in call stacks displayed by
print_stack_arm64(). It also removes it from the virtual address shown
on abort (__print_abort_info()) since symbolize.py does try to resolve
the address as symbol + offset ; but in this case the tagged address is
printed as well, because it can be helpful to diagnose tag check faults.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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ldelf: strip PAC from TA addresses

When pointer authentication is enables for TA's, the LR values
saved in the stack will have PAC which must be stripped off
when unwinding the stack.

Signed-off-by

ldelf: strip PAC from TA addresses

When pointer authentication is enables for TA's, the LR values
saved in the stack will have PAC which must be stripped off
when unwinding the stack.

Signed-off-by: Ruchika Gupta <ruchika.gupta@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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arm64: format call stack addresses on 8 characters by default

print_stack_arm64() currently shows the full 64 bit addresses in
hexadecimal with leading zeros (0x0000000000000000). This is a bit hard

arm64: format call stack addresses on 8 characters by default

print_stack_arm64() currently shows the full 64 bit addresses in
hexadecimal with leading zeros (0x0000000000000000). This is a bit hard
to read and is not necessary since virtual addresses are typically 32
or 36 bits (defined by CFG_LPAE_ADDR_SPACE_BITS), and in any case
nowhere near 64 bits.
Therefore, use a 32-bit format by default (0x00000000) and expand the
width as necessary. The new format is already used in ldelf to print
the region addresses so this changes brings consistency.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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Add unwind library (libunw)

Adds libunw to consolidate the stack unwinding code found in
ldelf/unwind_arm{32,64}.c and core/arch/arm/kernel/unwind_arm{32,64}.c.

The library is called "libunw" rathe

Add unwind library (libunw)

Adds libunw to consolidate the stack unwinding code found in
ldelf/unwind_arm{32,64}.c and core/arch/arm/kernel/unwind_arm{32,64}.c.

The library is called "libunw" rather than "libunwind" to avoid
confusion with the GNU libunwind [1]. The header file is <unw/unwind.h>
to avoid a conflict with GCC's <unwind.h>.

Link: [1] https://www.nongnu.org/libunwind
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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