lib/stack: Restrengthen base_address

commit a1f2b0e1efd5 ("treewide: lib/stack: Make base_address arch
specific") made base_address() a weak function in order to allow
architectures to override it.

lib/stack: Restrengthen base_address

commit a1f2b0e1efd5 ("treewide: lib/stack: Make base_address arch
specific") made base_address() a weak function in order to allow
architectures to override it. Linking for EFI doesn't seem to figure
out the right one to use though [anymore?]. It must have worked at
one point because the commit calls outs EFI as the motivation.
Anyway, just drop the weakness in favor of another HAVE_ define.

Signed-off-by: Andrew Jones <andrew.jones@linux.dev>

show more ...

Merge branch 'riscv/queue' into 'master'

riscv: Add EFI support and SBI base ext tests

See merge request kvm-unit-tests/kvm-unit-tests!54

treewide: lib/stack: Make base_address arch specific

Calculating the offset of an address is image specific, which is
architecture specific. Until now, all architectures and architecture
configurati

treewide: lib/stack: Make base_address arch specific

Calculating the offset of an address is image specific, which is
architecture specific. Until now, all architectures and architecture
configurations which select CONFIG_RELOC were able to subtract
_etext, but the EFI configuration of riscv cannot (it must subtract
ImageBase). Make this function weak, such that an architecture may
override it when necessary, to accommodate the image layout. Then,
immediately supply the riscv override.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Jones <andrew.jones@linux.dev>

show more ...

treewide: lib/stack: Fix backtrace

We should never pass the result of __builtin_frame_address(0) to
another function since the compiler is within its rights to pop the
frame to which it points befor

treewide: lib/stack: Fix backtrace

We should never pass the result of __builtin_frame_address(0) to
another function since the compiler is within its rights to pop the
frame to which it points before making the function call, as may be
done for tail calls. Nobody has complained about backtrace(), so
likely all compilations have been inlining backtrace_frame(), not
dropping the frame on the tail call, or nobody is looking at traces.
However, for riscv, when built for EFI, it does drop the frame on the
tail call, and it was noticed. Preemptively fix backtrace() for all
architectures.

Fixes: 52266791750d ("lib: backtrace printing")
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Jones <andrew.jones@linux.dev>

show more ...

Merge branch 'riscv/initial-port-v3' into 'master'

riscv: Initial port

See merge request kvm-unit-tests/kvm-unit-tests!50

riscv: Add backtrace support

Enable stack unwinding, even when going through an exception, by
implementing backtrace() and pushing a frame pointer on the stack
in exception_vectors.

Signed-off-by:

riscv: Add backtrace support

Enable stack unwinding, even when going through an exception, by
implementing backtrace() and pushing a frame pointer on the stack
in exception_vectors.

Signed-off-by: Andrew Jones <andrew.jones@linux.dev>
Acked-by: Thomas Huth <thuth@redhat.com>

show more ...