kernel/arch/sh/include/asm/dwarf.h, branch linux-rolling-stable

sh: Replace ASSEMBLY with ASSEMBLER in all headers

2025-06-07T13:16:21Z

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: Yoshinori Sato Cc: Rich Felker Cc: John Paul Adrian Glaubitz Cc: linux-sh@vger.kernel.org Signed-off-by: Thomas Huth Reviewed-by: John Paul Adrian Glaubitz Signed-off-by: John Paul Adrian Glaubitz

sh: include: convert to SPDX identifiers

2018-12-28T20:11:45Z

Update license to use SPDX-License-Identifier instead of verbose license text. Link: http://lkml.kernel.org/r/87ftvccszx.wl-kuninori.morimoto.gx@renesas.com Signed-off-by: Kuninori Morimoto Reviewed-by: Simon Horman Cc: Rich Felker Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

sh: Optimise FDE/CIE lookup by using red-black trees

2010-02-08T02:29:15Z

Now that the DWARF unwinder is being used to provide perf callstacks unwinding speed is an issue. It is no longer being used in exceptional circumstances where we don't care about runtime performance, e.g. when panicing, so it makes sense improve performance is possible. With this patch I saw a 42% improvement in unwind time when calling return_address(1). Greater improvements will be seen as the number of levels unwound increases as each unwind is now cheaper. Note that insertion time has doubled but that's just the price we pay for keeping the trees balanced. However, this is a one-time cost for kernel boot/module load and so the improvements in lookup time dominate the extra time we spend keeping the trees balanced. Signed-off-by: Matt Fleming Signed-off-by: Paul Mundt

sh: Tidy up the dwarf module helpers.

2009-10-13T04:32:19Z

This enables us to build the dwarf unwinder both with modules enabled and disabled in addition to reducing code size in the latter case. The helpers are also consolidated, and modified to resemble the BUG module helpers. Signed-off-by: Paul Mundt

sh: Generalize CALLER_ADDRx support.

2009-10-13T04:10:14Z

This splits out the unwinder implementation and adds a new return_address() abstraction modelled after the ARM code. The DWARF unwinder is tied in to this, returning NULL otherwise in the case of being unable to support arbitrary depths. This enables us to get correct behaviour with the unwinder enabled, as well as disabling the arbitrary depth support when frame pointers are enabled, as arbitrary depths with __builtin_return_address() are not supported regardless. With this abstraction it's also possible to layer on a simplified implementation with frame pointers in the event that the unwinder isn't enabled, although this is left as a future exercise. Signed-off-by: Paul Mundt

Merge branch 'sh/dwarf-unwinder'

2009-10-11T23:50:07Z

Conflicts: arch/sh/kernel/dwarf.c

sh: Fix memory leak in dwarf_unwind_stack()

2009-10-11T16:12:28Z

If we broke out of the while (1) loop because the return address of "frame" was zero, then "frame" needs to be free'd before we return. Signed-off-by: Matt Fleming

sh: Teach the DWARF unwinder about modules

2009-10-11T15:41:44Z

Pass a module's .eh_frame section to the DWARF unwinder at module load time so that the section's FDEs and CIEs can be registered with the DWARF unwinder. This allows us to unwind the stack through module code when generating backtraces. Signed-off-by: Matt Fleming

sh: unwinder: Fix up uninitialized variable warnings on sh2a build.

2009-08-31T04:47:06Z

A couple of these popped up on the sh2a build, causing build failures. Signed-off-by: Paul Mundt

sh: Handle the DWARF op, DW_CFA_undefined

2009-08-21T12:04:11Z

Allow a DWARF register to have an undefined value. When applied to the DWARF return address register this lets lets us label a function as having no direct caller, e.g. kernel_thread_helper(). Signed-off-by: Matt Fleming