s390x/snippets: Fix compilation with Clang 15

Clang complains:

s390x/snippets/c/cstart.S:22:13: error: invalid operand for instruction
lghi %r15, stackptr
^
Let's load the address w

s390x/snippets: Fix compilation with Clang 15

Clang complains:

s390x/snippets/c/cstart.S:22:13: error: invalid operand for instruction
lghi %r15, stackptr
^
Let's load the address with "larl" instead, like we already do
it in s390x/cstart64.S. For this we should also switch to 64-bit
mode first, then we also don't have to clear r15 right in front
of this anymore.

Changing the code here triggered another problem: initial_cr0
must be aligned on a double-word boundary, otherwise the lctlg
instruction will fail with an specification exception. This was
just working by accident so far - add an ".align 8" now to avoid
the problem.

Message-Id: <20230404101434.172721-1-thuth@redhat.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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Merge branch 's390x-next-2022-04' from imbrenda into 'master'

s390x: smp, vm lib updates; I/O and smp tests

See merge request kvm-unit-tests/kvm-unit-tests!29

s390x: snippets: c: Load initial cr0

As soon as we use C we need to set the AFP bit in cr0 so we can use
all fprs.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda

s390x: snippets: c: Load initial cr0

As soon as we use C we need to set the AFP bit in cr0 so we can use
all fprs.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

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Merge branch 's390x-pull-2021-10-18' into 'master'

s390x-pull-2021-10-18

See merge request kvm-unit-tests/kvm-unit-tests!18

s390x: snippets: Define all things that are needed to link the libc

In the long run, we want to use parts of the libc like memset() etc.,
too. However, to be able to link it correctly, we have to pr

s390x: snippets: Define all things that are needed to link the libc

In the long run, we want to use parts of the libc like memset() etc.,
too. However, to be able to link it correctly, we have to provide
some stub functions like puts() and exit() to avoid that too much
other stuff from the lib folder gets pulled into the binaries, which
we cannot provide in the snippets (like the sclp support).

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20211008092649.959956-1-thuth@redhat.com>
Link: https://lore.kernel.org/kvm/20211008092649.959956-1-thuth@redhat.com/
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

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s390x: snippets: Set stackptr and stacktop in cstart.S

We have a stack, so why not define it and be a step closer to include
the lib into the snippets.

Signed-off-by: Janosch Frank <frankja@linux.i

s390x: snippets: Set stackptr and stacktop in cstart.S

We have a stack, so why not define it and be a step closer to include
the lib into the snippets.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>

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Merge branch 's390x-pull-2021-16-08' into 'master'

s390x-pull-2021-16-08

See merge request kvm-unit-tests/kvm-unit-tests!15

s390x: Add SPDX and header comments for the snippets folder

Seems like I missed adding them.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.c

s390x: Add SPDX and header comments for the snippets folder

Seems like I missed adding them.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>

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Merge branch 's390x-pull-2021-07-07' into 'master'

s390x-pull-2021-07-07

See merge request kvm-unit-tests/kvm-unit-tests!13

s390x: snippets: Add gitignore as well as linker script and start assembly

Snippets are small guests which can be run under a unit test that
implements a simple hypervisor. They can be written in C

s390x: snippets: Add gitignore as well as linker script and start assembly

Snippets are small guests which can be run under a unit test that
implements a simple hypervisor. They can be written in C or
assembly. The C code needs a linker script and a start assembly file
that jumps to main to work properly. So let's add that as well as a
gitignore entry for the new files.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>

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