[v1] linux-user/aarch64: Fix SME/SME2 signal frame handling

[PATCH for-10.1 0/3] linux-user/aarch64: Fix SME/SME2 signal frame handling

Peter Maydell posted 3 patches 3 months, 3 weeks ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20250725142240.3760452-1-peter.maydell@linaro.org

Maintainers: Laurent Vivier <laurent@vivier.eu>

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linux-user/aarch64/signal.c | 142 +++++++++++++++++++++++++++++++++++-
1 file changed, 140 insertions(+), 2 deletions(-)

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[PATCH for-10.1 0/3] linux-user/aarch64: Fix SME/SME2 signal frame handling

Posted by Peter Maydell 3 months, 3 weeks ago

This patchset fixes some bugs in our SME-related signal frame
handling for linux-user:

 * we need to make the equivalent change to a recent kernel
   bugfix/ABI change: TPIDR2_EL0 should be cleared when delivering
   a signal
 * we forgot the TPIDR2_MAGIC signal frame record (which is necessary
   for SME v1)
 * we forgot the ZT_MAGIC signal frame record when implementing SME2

These bugs generally only surface when guest code attempts to
unwind an exception from inside a signal handler and SME is
involved. Discovered (and the fixes tested) by some new gcc
test cases which implement their part of the bugfix/ABI change
 https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=b5ffc8e75a8

thanks
-- PMM


Peter Maydell (3):
  linux-user/aarch64: Clear TPIDR2_EL0 when delivering signals
  linux-user/aarch64: Support TPIDR2_MAGIC signal frame record
  linux-user/aarch64: Support ZT_MAGIC signal frame record

 linux-user/aarch64/signal.c | 142 +++++++++++++++++++++++++++++++++++-
 1 file changed, 140 insertions(+), 2 deletions(-)

-- 
2.43.0