linux.git/arch/s390/lib, branch v5.14

s390/lib: use call_on_stack() macro

2021-07-08T20:12:18+00:00

Reviewed-by: Sven Schnelle 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/lib,string: fix strcat() inline asm constraint modifier

2021-07-05T10:44:23+00:00

"dummy" is not only used as output but also as input. Therefore use
the correct "+" constraint modifier.

Fixes: 8cf23c8e1fec ("s390/lib,string: get rid of register asm")
Reported-by: Sven Schnelle 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/lib,uaccess: fix copy_in_user_mvcos() inline asm clobber list

2021-07-05T10:44:23+00:00

General register 0 is clobbered within the inline assembly and
therefore must be listed in the clobber list.

Fixes:  d1e18efa8fa9 ("s390/lib,uaccess: get rid of register asm")
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/lib,string: get rid of register asm

2021-06-28T09:18:28+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/lib,uaccess: get rid of register asm

2021-06-28T09:18:28+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/lib,xor: get rid of register asm

2021-06-28T09:18:28+00:00

Looking at the generate code this was just a micro-optimization.
However given that as many register asm constructs as possible
will be removed from s390 code, remove this one as well.

Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/test_unwind: print test suite start/end info

2021-04-15T15:47:42+00:00

Add couple of additional info lines to make it easier to match
test suite output and results.

Signed-off-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens

s390/test_unwind: add WARN if tests failed

2021-04-12T10:46:44+00:00

Trigger a warning if any of unwinder tests fail. This should help to
prevent quiet ignoring of test results when panic_on_warn is enabled.

Signed-off-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens

s390/test_unwind: unify error handling paths

2021-04-12T10:46:44+00:00

Handle the case of "unwind state reliable but addr is 0" like other error
cases in this function and trigger output of failing stacktrace to aid
debugging.

Signed-off-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens

s390: convert to generic entry

2021-01-19T11:29:26+00:00

This patch converts s390 to use the generic entry infrastructure from
kernel/entry/*.

There are a few special things on s390:

- PIF_PER_TRAP is moved to TIF_PER_TRAP as the generic code doesn't
  know about our PIF flags in exit_to_user_mode_loop().

- The old code had several ways to restart syscalls:

  a) PIF_SYSCALL_RESTART, which was only set during execve to force a
     restart after upgrading a process (usually qemu-kvm) to pgste page
     table extensions.

  b) PIF_SYSCALL, which is set by do_signal() to indicate that the
     current syscall should be restarted. This is changed so that
     do_signal() now also uses PIF_SYSCALL_RESTART. Continuing to use
     PIF_SYSCALL doesn't work with the generic code, and changing it
     to PIF_SYSCALL_RESTART makes PIF_SYSCALL and PIF_SYSCALL_RESTART
     more unique.

- On s390 calling sys_sigreturn or sys_rt_sigreturn is implemented by
executing a svc instruction on the process stack which causes a fault.
While handling that fault the fault code sets PIF_SYSCALL to hand over
processing to the syscall code on exit to usermode.

The patch introduces PIF_SYSCALL_RET_SET, which is set if ptrace sets
a return value for a syscall. The s390x ptrace ABI uses r2 both for the
syscall number and return value, so ptrace cannot set the syscall number +
return value at the same time. The flag makes handling that a bit easier.
do_syscall() will just skip executing the syscall if PIF_SYSCALL_RET_SET
is set.

CONFIG_DEBUG_ASCE was removd in favour of the generic CONFIG_DEBUG_ENTRY.
CR1/7/13 will be checked both on kernel entry and exit to contain the
correct asces.

Signed-off-by: Sven Schnelle 
Signed-off-by: Vasily Gorbik