kexec: initialize ELF lowest address to ULONG_MAX

Patch series "powerpc/crash: use generic crashkernel reservation", v3.

Commit 0ab97169aa05 ("crash_core: add generic function to do reservation")
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kexec: initialize ELF lowest address to ULONG_MAX

Patch series "powerpc/crash: use generic crashkernel reservation", v3.

Commit 0ab97169aa05 ("crash_core: add generic function to do reservation")
added a generic function to reserve crashkernel memory. So let's use the
same function on powerpc and remove the architecture-specific code that
essentially does the same thing.

The generic crashkernel reservation also provides a way to split the
crashkernel reservation into high and low memory reservations, which can
be enabled for powerpc in the future.

Additionally move powerpc to use generic APIs to locate memory hole for
kexec segments while loading kdump kernel.


This patch (of 7):

kexec_elf_load() loads an ELF executable and sets the address of the
lowest PT_LOAD section to the address held by the lowest_load_addr
function argument.

To determine the lowest PT_LOAD address, a local variable lowest_addr
(type unsigned long) is initialized to UINT_MAX. After loading each
PT_LOAD, its address is compared to lowest_addr. If a loaded PT_LOAD
address is lower, lowest_addr is updated. However, setting lowest_addr to
UINT_MAX won't work when the kernel image is loaded above 4G, as the
returned lowest PT_LOAD address would be invalid. This is resolved by
initializing lowest_addr to ULONG_MAX instead.

This issue was discovered while implementing crashkernel high/low
reservation on the PowerPC architecture.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: a0458284f062 ("powerpc: Add support code for kexec_file_load()")
Signed-off-by: Sourabh Jain <[email protected]>
Acked-by: Hari Bathini <[email protected]>
Acked-by: Baoquan He <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Mahesh Salgaonkar <[email protected]>
Cc: Michael Ellerman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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kexec_elf: support 32 bit ELF files

The powerpc version only supported 64 bit. Add some
code to switch decoding of fields during runtime so
we can kexec a 32 bit kernel from a 64 bit kernel and
vice

kexec_elf: support 32 bit ELF files

The powerpc version only supported 64 bit. Add some
code to switch decoding of fields during runtime so
we can kexec a 32 bit kernel from a 64 bit kernel and
vice versa.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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kexec_elf: remove unused variable in kexec_elf_load()

base was never assigned, so we can remove it.

Reviewed-by: Christophe Leroy <[email protected]>
Reviewed-by: Thiago Jung Bauermann <bauer

kexec_elf: remove unused variable in kexec_elf_load()

base was never assigned, so we can remove it.

Reviewed-by: Christophe Leroy <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Sven Schnelle <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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kexec_elf: remove Elf_Rel macro

It wasn't used anywhere, so lets drop it.

Reviewed-by: Christophe Leroy <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-

kexec_elf: remove Elf_Rel macro

It wasn't used anywhere, so lets drop it.

Reviewed-by: Christophe Leroy <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Sven Schnelle <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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kexec_elf: remove PURGATORY_STACK_SIZE

It's not used anywhere so just drop it.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed

kexec_elf: remove PURGATORY_STACK_SIZE

It's not used anywhere so just drop it.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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kexec_elf: remove parsing of section headers

We're not using them, so we can drop the parsing.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux

kexec_elf: remove parsing of section headers

We're not using them, so we can drop the parsing.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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kexec_elf: change order of elf_*_to_cpu() functions

Change the order to have a 64/32/16 order, no functional change.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bau

kexec_elf: change order of elf_*_to_cpu() functions

Change the order to have a 64/32/16 order, no functional change.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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kexec: add KEXEC_ELF

Right now powerpc provides an implementation to read elf files
with the kexec_file_load() syscall. Make that available as a public
kexec interface so it can be re-used on other

kexec: add KEXEC_ELF

Right now powerpc provides an implementation to read elf files
with the kexec_file_load() syscall. Make that available as a public
kexec interface so it can be re-used on other architectures.

Signed-off-by: Sven Schnelle <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

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