linux.git/tools/perf/util/libunwind-arch, branch master

perf unwind-libunwind: Add RISC-V libunwind support

2026-05-15T19:19:50+00:00

Add a RISC-V implementation for unwinding.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andrew Jones 
Cc: Athira Rajeev 
Cc: Dapeng Mi 
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Florian Fainelli 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Leo Yan 
Cc: Li Guan 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Shimin Guo 
Cc: Thomas Richter 
Cc: Tomas Glozar 
Cc: Will Deacon 
Signed-off-by: Arnaldo Carvalho de Melo

perf unwind-libunwind: Remove libunwind-local

2026-05-15T19:19:50+00:00

Local unwinding only works on the machine libunwind is built for,
rather than cross platform, the APIs for remote and local unwinding
are similar but types like unw_word_t depend on the included
header. Place the architecture specific code into the appropriate
libunwind-.c file. Put generic code in unwind-libunwind.c and
use libunwind-arch to choose the correct implementation based on the
thread's e_machine. Structuring the code this way avoids including the
unwind-libunwind-local.c for each architecture of remote
unwinding. Data is moved into the struct unwind_info to simplify the
architecture and generic code, trying to keep as much code as possible
generic.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andrew Jones 
Cc: Athira Rajeev 
Cc: Dapeng Mi 
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Florian Fainelli 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Leo Yan 
Cc: Li Guan 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Shimin Guo 
Cc: Thomas Richter 
Cc: Tomas Glozar 
Cc: Will Deacon 
Signed-off-by: Arnaldo Carvalho de Melo

perf unwind-libunwind: Move flush/finish access out of local

2026-05-15T19:19:50+00:00

Flush and finish access are relatively simple calls into libunwind,
move them out struct unwind_libunwind_ops. So that the correct version
can be called, add an e_machine variable to maps. This size regression
will go away when the unwind_libunwind_ops no longer need stashing in
the maps. To set the e_machine up pass it into unwind__prepare_access,
which no longer needs to determine the unwind operations based on a
map dso because of this. This also means the maps copying code can
call unwind__prepare_access once for the e_machine rather than once
per map.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andrew Jones 
Cc: Athira Rajeev 
Cc: Dapeng Mi 
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Florian Fainelli 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Leo Yan 
Cc: Li Guan 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Shimin Guo 
Cc: Thomas Richter 
Cc: Tomas Glozar 
Cc: Will Deacon 
Signed-off-by: Arnaldo Carvalho de Melo

perf unwind-libunwind: Make libunwind register reading cross platform

2026-05-15T19:18:36+00:00

Move the libunwind register to perf register mapping functions in
arch/../util/unwind-libunwind.c into a new libunwind-arch
directory. Rename the functions to
__get_perf_regnum_for_unw_regnum_. Add untested ppc32 and s390
functions. Add a get_perf_regnum_for_unw_regnum function that takes an
ELF machine as well as a register number and chooses the appropriate
architecture implementation.

Split the x86 and powerpc 32 and 64-bit implementations apart so that
a single libunwind-.h header is included.

Move the e_machine into the unwind_info struct to make it easier to
pass.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andrew Jones 
Cc: Athira Rajeev 
Cc: Dapeng Mi 
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Florian Fainelli 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Leo Yan 
Cc: Li Guan 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Shimin Guo 
Cc: Thomas Richter 
Cc: Tomas Glozar 
Cc: Will Deacon 
[ Map UNW_PPC32_NIP to PERF_REG_POWERPC_NIP like done for 64-bit, pointed out by a local sashiko ]
Signed-off-by: Arnaldo Carvalho de Melo