Some packaging tools want to override `LDFLAGS` when building QEMU, this will
result in a build error as most likely no `-nostdlib` flag is passed. Introduce
`EXTRA_LDFLAGS` so that the packager can override `LDFLAGS` without breaking the
build.
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Message-ID: <20241001153618.17791-4-mhartmay@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Drop the hunk to netbook.mak which is not necessary anymore]
Signed-off-by: Thomas Huth <thuth@redhat.com>
Commit 7cd50cbe4c ("pc-bios/s390-ccw: Don't use __bss_start with the
"larl" instruction") introduced the address constant bss_start_literal
for __bss_start in the .text section, which introduced a relocation in
code (i.e. TEXTREL). The dedicated constant is required, as __bss_start
may not necessarily be aligned on a 2-byte boundary (see subject commit
for details).
Move the constant to the .data section to get rid of the relocation in
the .text section. Add the linker option -z text to prevent TEXTRELs to
get introduced in the future.
Note that the R_390_RELATIVE relocations are taken care of by function
glue() in include/hw/elf_ops.h.inc introduced by commit 5dce07e1cb
("elf-loader: Provide the possibility to relocate s390 ELF files").
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Message-ID: <20241001153618.17791-3-mhartmay@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Currently, structures defined in both hw/s390x/ipl.h and pc-bios/s390-ccw/iplb.h
must be kept in sync, which is prone to error. Instead, create a new directory
at include/hw/s390x/ipl/ to contain the definitions that must be shared.
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241020012953.1380075-14-jrossi@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Now that the netboot code has been merged into the main s390-ccw.img,
it also does not make sense to keep the build rules in a separate
file. Thus let's merge netboot.mak into the main Makefile.
Message-Id: <20240621082422.136217-7-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
We originally built a separate binary for the netboot code since it
was considered as experimental and we could not be sure that the
necessary SLOF module had been checked out. Time passed, the code
proved its usefulness, and the build system nowadays makes sure that
the SLOF module is checked out if you have a s390x compiler available
for building the s390-ccw bios. So there is no real compelling reason
anymore to keep the netboot code in a separate binary. Linking the
code together with the main s390-ccw.img will make future enhancements
much easier, like supporting more than one boot device.
Co-authored by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Message-ID: <20241020012953.1380075-4-jrossi@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
We are already using the libc from SLOF for the s390-netboot.img, and
this libc implementation is way more complete and accurate than the
simple implementation that we currently use for the s390-ccw.img binary.
Since we are now always assuming that the SLOF submodule is available
when building the s390-ccw bios (see commit bf6903f694), we can drop
the simple implementation and use the SLOF libc for the s390-ccw.img
binary, too.
Additionally replace sclp_print calls with puts/printf now that it is
available.
Co-authored by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Message-ID: <20241020012953.1380075-3-jrossi@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The -Wl,-pie and -nostdlib flags are added to LDFLAGS twice. Merge
the two lines to get rid of the duplicates.
Message-ID: <20240621082422.136217-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Recent versions of ld complain when linking the s390-ccw bios:
/usr/bin/ld: warning: start.o: missing .note.GNU-stack section implies
executable stack
/usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in
a future version of the linker
We can silence the warning by telling the linker to mark the stack
as not executable.
Message-Id: <20230622130822.396793-1-thuth@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
In the beginning, the network bootloader was considered experimental and
thus optional, but it is well established nowadays and configure always
checks for roms/SLOF before compiling pc-bios/s390-ccw.
Therefore, it makes sense to always build it together with the other
part of the s390-ccw bios.
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Move the handling of the roms/SLOF submodule out of the main Makefile,
since we are going to remove submodules from the build process of QEMU.
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220929114231.583801-31-alex.bennee@linaro.org>
In preparation for adding Docker container support, detect compiler options
just once rather than once per Make run; container startup overhead is
substantial and doing the detection just once makes things faster.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220929114231.583801-15-alex.bennee@linaro.org>
The option generates a lot of warnings for integers casted to pointers,
for example:
/home/pbonzini/work/upstream/qemu/pc-bios/s390-ccw/dasd-ipl.c:174:19: warning: array subscript 0 is outside array bounds of ‘CcwSeekData[0]’ [-Warray-bounds]
174 | seekData->cyl = 0x00;
| ~~~~~~~~~~~~~~^~~~~~
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
QEMU_CFLAGS is not available in pc-bios/s390-ccw/netboot.mak, but the Makefile
needs to access the flags passed to the configure script for the s390x
cross compiler. Fix everything and rename QEMU_CFLAGS to EXTRA_CFLAGS for
consistency with tests/tcg.
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
While container-based cross compilers are not supported, this already makes
it possible to build s390-ccw on any machine that has s390x GCC and binutils
installed.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220517092616.1272238-14-pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220527153603.887929-25-alex.bennee@linaro.org>
Always include the STRIP variable in config-host.mak (it's only used
by the s390-ccw firmware build, and it adds a default if configure
omitted it), and use meson-buildoptions.sh to turn
--enable/--disable-strip into -Dstrip.
The default is now not to strip the binaries like for almost every other
package that has a configure script.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Clang unfortunately does not support generating code for the z900
architecture level and starts with the z10 instead. Thus to be able
to support compiling with Clang, we have to check for the supported
compiler flags. The disadvantage is of course that the bios image
will only run with z10 guest CPUs upwards (which is what most people
use anyway), so just in case let's also emit a warning in that case
(we will continue to ship firmware images that have been pre-built
with GCC in future releases, so this should not impact normal users,
too).
Message-Id: <20210502174836.838816-5-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
When building on Fedora 34 (gcc version 11.0.0 20210210) we get:
In file included from pc-bios/s390-ccw/main.c:11:
In function ‘memset’,
inlined from ‘boot_setup’ at pc-bios/s390-ccw/main.c:185:5,
inlined from ‘main’ at pc-bios/s390-ccw/main.c:288:5:
pc-bios/s390-ccw/libc.h:28:14: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
28 | p[i] = c;
| ~~~~~^~~
The offending code is:
memset((char *)S390EP, 0, 6);
where S390EP is a const address:
#define S390EP 0x10008
The compiler doesn't know how big that pointed area is, so it assume that
its length is zero. This has been reported as BZ#99578 to GCC:
"gcc-11 -Warray-bounds or -Wstringop-overread warning when accessing a
pointer from integer literal"
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578
As this warning does us more harm than good in the BIOS code (where
lot of direct accesses to low memory are done), silence this warning
for all BIOS objects.
Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210422145911.2513980-1-philmd@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20210502174836.838816-4-thuth@redhat.com>
[thuth: Use the pre-existing cc-option macro instead of adding a new one]
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The cc-option macro is not doing what it should - compared with the
original from the rules.mak file that got removed with commit
660f793093 ("Makefile: inline the relevant parts of rules.mak"),
the arguments got changed and thus the macro is rather doubling
the QEMU_CFLAGS than adding the flag that should be tested.
Message-Id: <20210502174836.838816-3-thuth@redhat.com>
Fixes: 22fb2ab096 ("pc-bios/s390-ccw: do not use rules.mak")
Signed-off-by: Thomas Huth <thuth@redhat.com>
The main QEMU code is compiled with -std=gnu99, -fwrapv and -fno-common.
We should use the same flags for the s390-ccw bios, too, to avoid that
we get different behavior with different compiler versions that changed
their default settings in the course of time (it happened at least with
-std=... and -fno-common in the past already).
While we're at it, also group the other flags here in a little bit nicer
fashion: Move the two "-m" flags out of the "-f" area and specify them on
a separate line.
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20200806105349.632-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The missing "/all" suffix prevents the pc-bios/ parts of the build
from running.
In the meanwhile, -Wall has moved from QEMU_CFLAGS to CFLAGS. Simplify
everything by not passing down CFLAGS, and add -Wall in the recursive
Makefiles.
Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
Reviewed-by: Miroslav Rezanina <mrezanin@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Fixes: 5e6d1573b4 ("remove Makefile.target", 2020-08-21)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The Makefile of the s390-ccw bios does not handle dependencies of the
*.c files from the headers yet, so that you often have to run a "make
clean" to get the build right when one of the headers has been changed.
Let's make sure that we generate and include dependency files for all
*.c files now to avoid this problem in the future.
Acked-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200630142955.7662-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Allows guest to boot from a vfio configured real dasd device.
Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1554388475-18329-16-git-send-email-jjherne@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Create a separate library for channel i/o related code. This decouples
channel i/o operations from virtio and allows us to make use of them for
the real dasd boot path.
Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1554388475-18329-6-git-send-email-jjherne@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The -O2 optimization flag is passed via CFLAGS to the firmware Makefile,
but in netbook.mak, we've got some rules that only use QEMU_CFLAGS for
compiling the libc and libnet from SLOF, so these files get compiled
without optimization so far. Use CFLAGS here, too, to create faster
and smaller code.
We can additionally save some more bytes in the firmware images by compi-
ling the code with -fno-asynchronous-unwind-tables. This will omit some
ELF sections (used for stack unwinding for example) from the image that
we do not need in the firmware.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The netboot firmware so far simply jumped directly into the OS kernel
after the download has been completed. This, however, bears the risk
that the virtio-net device still might be active in the background and
incoming packets are still placed into the buffers - which could destroy
memory of the now-running Linux kernel in case it did not take over the
device fast enough. Also the SCLP console is not put into a well-defined
state here. We should hand over the system in a clean state when jumping
into the kernel, so let's use the same mechanism as it's done in the
main s390-ccw firmware and reset the machine with diag308 into a clean
state before jumping into the OS kernel code. To be able to share the
code with the main s390-ccw firmware, the related functions are now
extracted from bootmap.c into a new file called jump2ipl.c.
Since we now also set the boot device schid at address 184 for the network
boot device, this patch also slightly changes the way how we detect the
entry points for non-ELF binary images: The code now looks for the "S390EP"
magic first and then jumps to 0x10000 in case it has been found. This is
necessary for booting from network devices, since the normal kernel code
(where the PSW at ddress 0 points to) tries to do a block load from the
boot device. This of course fails for a virtio-net device and causes the
kernel to abort with a panic-PSW silently.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reads boot menu flag and timeout values from the iplb and
sets the respective fields for the menu.
Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Moved:
memcmp from bootmap.h to libc.h (renamed from _memcmp)
strlen from sclp.c to libc.h (renamed from _strlen)
Added C standard functions:
isdigit
Added non C-standard function:
uitoa
atoui
Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This reverts a change that replaced the "rm -f" command with the
undefined variable RM (expected to be set by make), and causes the
"make clean" command to fail for a s390 target:
make[1]: Entering directory '/usr/src/qemu/build/pc-bios/s390-ccw'
rm -f *.timestamp
*.o *.d *.img *.elf *~ *.a
/bin/sh: *.o: command not found
Makefile:39: recipe for target 'clean' failed
make[1]: *** [clean] Error 127
make[1]: Leaving directory '/usr/src/qemu/build/pc-bios/s390-ccw'
Makefile:489: recipe for target 'clean' failed
make: *** [clean] Error 1
Fixes: 3e4415a751 ("pc-bios/s390-ccw: Add core files for the network
bootloading program")
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Message-Id: <20170814204450.24118-2-farman@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This is just a preparation for the next steps: Add a makefile and a
stripped down copy of pc-bios/s390-ccw/main.c as a basis for the network
bootloader program, linked against the libc from SLOF already (which we
will need for SLOF's libnet). The networking code is not included yet.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1499863793-18627-10-git-send-email-thuth@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
The netboot code is going to link against the code from virtio.c, too, so
we've got to move the virtio-block and -scsi related code out of the way.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1499863793-18627-4-git-send-email-thuth@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
The docker-run-test-build@debian-s390x-cross target fails with:
strip --strip-unneeded s390-ccw.elf -o s390-ccw.img
strip: Unable to recognise the format of the input file `s390-ccw.elf'
The configure script defines a STRIP makefile variable whose default
value is ${cross_prefix}strip. Let's use it.
We default to using the non-prefixed strip command in case --enable-debug
or --disable-strip was passed to configure during a regular build.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <149623617700.4947.12490877660892961664.stgit@bahia.lan>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Obtain the loadparm value stored in SCP Read Info by performing
a SCLP Read Info request.
Rename sclp-ascii.c to sclp.c to reflect the changed scope of
the file.
Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
The quiet-command make rule currently takes two arguments:
the command and arguments to run, and a string to print if
the V flag is not set (ie we are not being verbose).
By convention, the string printed is of the form
" NAME some args". Unfortunately to get nicely lined up
output all the strings have to agree about what column the
arguments should start in, which means that if we add a
new quiet-command usage which wants a slightly longer CMD
name then we either put up with misalignment or change
every quiet-command string.
Split the quiet-mode string into two, the "NAME" and
the "same args" part, and use printf(1) to format the
string automatically. This means we only need to change
one place if we want to support a longer maximum name.
In particular, we can now print 7-character names lined
up properly (they are needed for the OSX "SETTOOL" invocation).
Change all the uses of quiet-command to the new syntax.
(Any which are missed or inadvertently reintroduced
via later merges will result in slightly misformatted
quiet output rather than disaster.)
A few places in the pc-bios/ makefiles are updated to use
"BUILD", "SIGN" and "STRIP" rather than "Building",
"Signing" and "Stripping" for consistency and to keep them
below 7 characters. Module .mo links now print "LD" rather
than the nonstandard "LD -r".
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1475598441-27908-1-git-send-email-peter.maydell@linaro.org
Since
commit a9c87304b7 ("build-sys: fix building with make CFLAGS=.. argument")
pc-bios/s390-ccw.img build might fail with
--- snip ---
main.o: In function `virtio_setup':
qemu/pc-bios/s390-ccw/main.c:117: undefined reference to `__stack_chk_fail'
--- snip ---
Changing the CFLAGS to QEMU_CFLAGS does the trick. We also need to
add -fno-strict-aliasing as this was filtered out.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1471258997-5811-1-git-send-email-borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Make the code added before to work.
Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Newer distributions have an architecture level set to z9, z196
or similar - also as default option for the compiler.
We should build the bios for z900 to allow it to run with
all 64bit CPUs. This will become more important as soon as
QEMU/KVM does support CPU models.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-By: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Some gcc versions (e.g. Fedora 22 gcc 5.1.1) seem to use floating
point registers for spilling and filling of general purpose registers.
As the BIOS does not activate the AFP register setting of CR0 this can
cause data exception program checks.
Disallow floating point in the BIOS as a simple solution.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Message-Id: <1443689387-34473-2-git-send-email-jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Starting with version 4.9, GCC assumes it can't safely dereference null
pointers, and uses this for some optimizations. On s390, the lowcore
memory is located at address 0, so this assumption is wrong and breaks
the s390-ccw firmware. Pass -fdelete-null-pointer-checks to avoid that.
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Message-Id: <1434363843-14576-1-git-send-email-aurelien@aurel32.net>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
The current bios sits at location 0x7e00000 in the guest RAM
and thus prevents loading of bigger ramdisks. By making the
image relocatable we can move it to the end of the RAM so that
it is getting out of the way.
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Message-Id: <1425895973-15239-3-git-send-email-thuth@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[Fixup build failure on 32 bit hosts]
We have to call strip with s390-ccw.elf as input and
s390-ccw.img as output
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This patch adds a makefile, so we can build our ccw firmware. Also
add the resulting binaries to .gitignore, so that nobody is annoyed
they might be in the tree.
Signed-off-by: Alexander Graf <agraf@suse.de>
