kbuild: Create intermediate vmlinux build with relocations preserved

The imperative paradigm used to build vmlinux, extract some info from it
or perform some checks on it, and subsequently modify it

kbuild: Create intermediate vmlinux build with relocations preserved

The imperative paradigm used to build vmlinux, extract some info from it
or perform some checks on it, and subsequently modify it again goes
against the declarative paradigm that is usually employed for defining
make rules.

In particular, the Makefile.postlink files that consume their input via
an output rule result in some dodgy logic in the decompressor makefiles
for RISC-V and x86, given that the vmlinux.relocs input file needed to
generate the arch-specific relocation tables may not exist or be out of
date, but cannot be constructed using the ordinary Make dependency based
rules, because the info needs to be extracted while vmlinux is in its
ephemeral, non-stripped form.

So instead, for architectures that require the static relocations that
are emitted into vmlinux when passing --emit-relocs to the linker, and
are subsequently stripped out again, introduce an intermediate vmlinux
target called vmlinux.unstripped, and organize the reset of the build
logic accordingly:

- vmlinux.unstripped is created only once, and not updated again
- build rules under arch/*/boot can depend on vmlinux.unstripped without
running the risk of the data disappearing or being out of date
- the final vmlinux generated by the build is not bloated with static
relocations that are never needed again after the build completes.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

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riscv: boot: add Image.xz support

The Image.* targets existed for other compressors already. Bootloader
support is needed for decompression.

This is for CONFIG_EFI_ZBOOT=n. With CONFIG_EFI_ZBOOT=y

riscv: boot: add Image.xz support

The Image.* targets existed for other compressors already. Bootloader
support is needed for decompression.

This is for CONFIG_EFI_ZBOOT=n. With CONFIG_EFI_ZBOOT=y, XZ was already
available.

Comparision with Linux 6.10 RV64GC tinyconfig (in KiB):

1027 Image
594 Image.gz
541 Image.zst
510 Image.lzma
474 Image.xz

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lasse Collin <[email protected]>
Reviewed-by: Emil Renner Berthing <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Jules Maselbas <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Joel Stanley <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Jubin Zhong <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Rui Li <[email protected]>
Cc: Sam James <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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riscv: boot: remove duplicated targets line

The "targets:" is duplicated in another line, remove the one with less
targets.

Signed-off-by: Jisheng Zhang <[email protected]>
Reviewed-by: Emil Renne

riscv: boot: remove duplicated targets line

The "targets:" is duplicated in another line, remove the one with less
targets.

Signed-off-by: Jisheng Zhang <[email protected]>
Reviewed-by: Emil Renner Berthing <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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Makefile: remove redundant tool coverage variables

Now Kbuild provides reasonable defaults for objtool, sanitizers, and
profilers.

Remove redundant variables.

Note:

This commit changes the covera

Makefile: remove redundant tool coverage variables

Now Kbuild provides reasonable defaults for objtool, sanitizers, and
profilers.

Remove redundant variables.

Note:

This commit changes the coverage for some objects:

- include arch/mips/vdso/vdso-image.o into UBSAN, GCOV, KCOV
- include arch/sparc/vdso/vdso-image-*.o into UBSAN
- include arch/sparc/vdso/vma.o into UBSAN
- include arch/x86/entry/vdso/extable.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
- include arch/x86/entry/vdso/vdso-image-*.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
- include arch/x86/entry/vdso/vdso32-setup.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
- include arch/x86/entry/vdso/vma.o into GCOV, KCOV
- include arch/x86/um/vdso/vma.o into KASAN, GCOV, KCOV

I believe these are positive effects because all of them are kernel
space objects.

Signed-off-by: Masahiro Yamada <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Tested-by: Roberto Sassu <[email protected]>

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riscv: boot: Fix creation of loader.bin

When flashing loader.bin for K210 using kflash:

    [ERROR] This is an ELF file and cannot be programmed to flash directly: arch/riscv/boot/loader.bin

Befor

riscv: boot: Fix creation of loader.bin

When flashing loader.bin for K210 using kflash:

    [ERROR] This is an ELF file and cannot be programmed to flash directly: arch/riscv/boot/loader.bin

Before, loader.bin relied on "OBJCOPYFLAGS := -O binary" in the main
RISC-V Makefile to create a boot image with the right format. With this
removed, the image is now created in the wrong (ELF) format.

Fix this by adding an explicit rule.

Fixes: 505b02957e74f0c5 ("riscv: Remove duplicate objcopy flag")
Signed-off-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Link: https://lore.kernel.org/r/1086025809583809538dfecaa899892218f44e7e.1698159066.git.geert+renesas@glider.be
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: Use --emit-relocs in order to move .rela.dyn in init

To circumvent an issue where placing the relocations inside the init
sections produces empty relocations, use --emit-relocs. But to avoid

riscv: Use --emit-relocs in order to move .rela.dyn in init

To circumvent an issue where placing the relocations inside the init
sections produces empty relocations, use --emit-relocs. But to avoid
carrying those relocations in vmlinux, use an intermediate
vmlinux.relocs file which is a copy of vmlinux *before* stripping its
relocations.

Suggested-by: Björn Töpel <[email protected]>
Suggested-by: Nick Desaulniers <[email protected]>
Signed-off-by: Alexandre Ghiti <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: boot: add zstd support

Support build the zstd compressed Image.zst. Similar as other
compressed formats, the Image.zst is not self-decompressing and
the bootloader still needs to handle decom

riscv: boot: add zstd support

Support build the zstd compressed Image.zst. Similar as other
compressed formats, the Image.zst is not self-decompressing and
the bootloader still needs to handle decompression before
launching the kernel image.

Signed-off-by: Jisheng Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: efi: enable generic EFI compressed boot

Wire up the generic EFI zboot support for RISC-V.

Signed-off-by: Ard Biesheuvel <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Teste

riscv: efi: enable generic EFI compressed boot

Wire up the generic EFI zboot support for RISC-V.

Signed-off-by: Ard Biesheuvel <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Tested-by: Conor Dooley <[email protected]>

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riscv: move the (z)install rules to arch/riscv/Makefile

Currently, the (z)install targets in arch/riscv/Makefile descend into
arch/riscv/boot/Makefile to invoke the shell script, but there is no
goo

riscv: move the (z)install rules to arch/riscv/Makefile

Currently, the (z)install targets in arch/riscv/Makefile descend into
arch/riscv/boot/Makefile to invoke the shell script, but there is no
good reason to do so.

arch/riscv/Makefile can run the shell script directly.

Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

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RISC-V: enable XIP

Introduce XIP (eXecute In Place) support for RISC-V platforms.
It allows code to be executed directly from non-volatile storage
directly addressable by the CPU, such as QSPI NOR f

RISC-V: enable XIP

Introduce XIP (eXecute In Place) support for RISC-V platforms.
It allows code to be executed directly from non-volatile storage
directly addressable by the CPU, such as QSPI NOR flash which can
be found on many RISC-V platforms. This makes way for significant
optimization of RAM footprint. The XIP kernel is not compressed
since it has to run directly from flash, so it will occupy more
space on the non-volatile storage. The physical flash address used
to link the kernel object files and for storing it has to be known
at compile time and is represented by a Kconfig option.

XIP on RISC-V will for the time being only work on MMU-enabled
kernels.

Signed-off-by: Vitaly Wool <[email protected]>
[Alex: Rebase on top of "Move kernel mapping outside the linear mapping" ]
Signed-off-by: Alexandre Ghiti <[email protected]>
[Palmer: disable XIP for allyesconfig]
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: Clean up boot dir

Let's remove all files under riscv boot dir by using archclean rule.

Signed-off-by: Kefeng Wang <[email protected]>
Reviewed-by: Atish Patra <[email protected]>

riscv: Clean up boot dir

Let's remove all files under riscv boot dir by using archclean rule.

Signed-off-by: Kefeng Wang <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: Allow building with kcov coverage

Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
Also disable instrumentation of some early boot code and vdso.

Boot-tested on QEMU's riscv64 vi

riscv: Allow building with kcov coverage

Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
Also disable instrumentation of some early boot code and vdso.

Boot-tested on QEMU's riscv64 virt machine.

Signed-off-by: Tobias Klauser <[email protected]>
Acked-by: Dmitry Vyukov <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: create a loader.bin boot image for Kendryte SoC

Create the loader.bin bootable image file that can be loaded into
Kendryte K210 based boards using the kflash.py tool with the command:

kflash

riscv: create a loader.bin boot image for Kendryte SoC

Create the loader.bin bootable image file that can be loaded into
Kendryte K210 based boards using the kflash.py tool with the command:

kflash.py/kflash.py -t arch/riscv/boot/loader.bin

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

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riscv: Fix build dependency for loader

The Makefile addition for the flat image loader missed an obj prefix.

For most parallel builds this worked out fine, but with -j1 the dependency
wasn't fulfil

riscv: Fix build dependency for loader

The Makefile addition for the flat image loader missed an obj prefix.

For most parallel builds this worked out fine, but with -j1 the dependency
wasn't fulfilled and thus fails:

arch/riscv/boot/loader.S: Assembler messages:
arch/riscv/boot/loader.S:7: Error: file not found: arch/riscv/boot/Image

Fixes: 405fe7aa0dba ("riscv: provide a flat image loader")
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Olof Johansson <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Signed-off-by: Paul Walmsley <[email protected]>

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riscv: provide a flat image loader

This allows just loading the kernel at a pre-set address without
qemu going bonkers trying to map the ELF file.

Contains a contribution from Aurabindo Jayamohanan

riscv: provide a flat image loader

This allows just loading the kernel at a pre-set address without
qemu going bonkers trying to map the ELF file.

Contains a contribution from Aurabindo Jayamohanan to reuse the
PAGE_OFFSET definition.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
[[email protected]: fixed checkpatch issue; minor commit
message fix]
Signed-off-by: Paul Walmsley <[email protected]>

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RISC-V: Add multiple compression image format.

Currently, there is only support for .gz compression type
for generating kernel Image.

Add support for other compression methods(lzma, lz4, lzo, bzip2

RISC-V: Add multiple compression image format.

Currently, there is only support for .gz compression type
for generating kernel Image.

Add support for other compression methods(lzma, lz4, lzo, bzip2)
that helps in generating a even smaller kernel image. Image.gz
will still be the default compressed image.

Signed-off-by: Atish Patra <[email protected]>
Signed-off-by: Paul Walmsley <[email protected]>

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RISC-V: Build flat and compressed kernel images

This patch extends Linux RISC-V build system to build and install:
Image - Flat uncompressed kernel image
Image.gz - Flat and GZip compressed kernel i

RISC-V: Build flat and compressed kernel images

This patch extends Linux RISC-V build system to build and install:
Image - Flat uncompressed kernel image
Image.gz - Flat and GZip compressed kernel image

Quiet a few bootloaders (such as Uboot, UEFI, etc) are capable of
booting flat and compressed kernel images. In case of Uboot, booting
Image or Image.gz is achieved using bootm command.

The flat and uncompressed kernel image (i.e. Image) is very useful
in pre-silicon developent and testing because we can create back-door
HEX files for RAM on FPGAs from Image.

Signed-off-by: Anup Patel <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

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