linux-toradex.git/arch/sh/include/asm/dwarf.h, branch v6.7

sh: include: convert to SPDX identifiers

2018-12-28T20:11:45+00:00

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

2010-02-08T02:29:15+00:00

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.

2009-10-13T04:32:19+00:00

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.

2009-10-13T04:10:14+00:00

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'

2009-10-11T23:50:07+00:00

Conflicts:
	arch/sh/kernel/dwarf.c

sh: Fix memory leak in dwarf_unwind_stack()

2009-10-11T16:12:28+00:00

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

2009-10-11T15:41:44+00:00

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.

2009-08-31T04:47:06+00:00

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

2009-08-21T12:04:11+00:00

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

sh: unwinder: Set the flags for DW_CFA_val_offset ops as DWARF_VAL_OFFSET

2009-08-21T12:02:44+00:00

The handling of DW_CFA_val_offset ops was incorrectly using the
DWARF_REG_OFFSET flag but the register's value cannot be calculated
using the DWARF_REG_OFFSET method. Create a new flag to indicate that a
different method must be used to calculate the register's value even
though there is no implementation for DWARF_VAL_OFFSET yet; it's mainly
just a place holder.

Signed-off-by: Matt Fleming