[kvm-unit-tests,v3,0/7] s390x: Cleanup exception register save/restore and implement backtrace

Message

Janosch Frank Feb. 22, 2021, 8:57 a.m. UTC

Having two sets of macros for saving and restoring registers on
exceptions doesn't seem optimal to me. Therefore this patch set
removes the old macros that use the lowcore as storage in favor of the
stack using ones. At the same time we move over to generated offsets
instead of subtracting from the stack piece by piece. Changes to the
stack struct are easier that way.

Additionally let's add backtrace support and print the GRs on
exception so we get a bit more information when something goes wrong.

v3:
	* Squashed the STACK_FRAME_INT_SIZE definition patch
	* Added a backchain store before we branch to the C pgm handler
	* Switched to the *int*_t types from kernel style types
	* Added comments

v2:
	* Added full CR saving to fix diag308 test
	* Added rev-bys

Janosch Frank (7):
  s390x: Fix fpc store address in RESTORE_REGS_STACK
  s390x: Fully commit to stack save area for exceptions
  s390x: Introduce and use CALL_INT_HANDLER macro
  s390x: Provide preliminary backtrace support
  s390x: Print more information on program exceptions
  s390x: Move diag308_load_reset to stack saving
  s390x: Remove SAVE/RESTORE_STACK and lowcore fpc and fprs save areas

 lib/s390x/asm-offsets.c   | 17 ++++---
 lib/s390x/asm/arch_def.h  | 35 ++++++++++----
 lib/s390x/asm/interrupt.h |  4 +-
 lib/s390x/interrupt.c     | 43 +++++++++++++++---
 lib/s390x/stack.c         | 20 +++++---
 s390x/Makefile            |  1 +
 s390x/cpu.S               |  6 ++-
 s390x/cstart64.S          | 25 ++--------
 s390x/macros.S            | 96 ++++++++++++++++++++-------------------
 9 files changed, 148 insertions(+), 99 deletions(-)