kernel/git/next/linux-next.git/tools/perf/util/dwarf-regs.c, branch master

perf dwarf-regs: Add SIMD/eGPRs support for x86 DWARF registers

2026-09-14T18:35:05+00:00

Enhance the x86-specific DWARF register handling by adding support for SIMD and eGPRs registers. This update is based on the "DWARF Register Number Mapping" table from the "System V Application Binary Interface AMD64 Architecture Processor Supplement" (version 1.0). Modifications include: - Updating the x86_64_regidx_table[] array to incorporate SIMD and eGPRs registers. - Enhancing the __get_dwarf_regnum_for_perf_regnum_x86_64() function to retrieve the DWARF register index for eGPRs. Since currently libdw doesn't support SIMD and APX eGPRs registers yet, still keep the original return value for get_libdw_frame_nregs() helper. Signed-off-by: Dapeng Mi Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf-regs: Add MIPS perf to DWARF register number mapping functions

2026-01-20T18:43:56+00:00

Despite an unused function declaration, there was no unwind-libdw for MIPS but there is a perf_regs.h and a libdw implementation. Fill in the pieces so hopefully MIPS unwinding with libdw works. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf-regs: Add S390 perf to DWARF register number mapping functions

2026-01-20T18:43:56+00:00

These functions allow the generic initial register state code in unwind-libdw to be used. Now the non-generic code in unwind-libdw has no uses remove it. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf-regs: Add RISC-V perf to DWARF register number mapping functions

2026-01-20T18:43:56+00:00

These functions allow the generic initial register state code in unwind-libdw to be used. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf-regs: Add powerpc perf to DWARF register number mapping functions

2026-01-20T18:43:56+00:00

These functions allow the generic initial register state code in unwind-libdw to be used. Note, the link register was being coped to DWARF register 65 that the SysV ABI spec claims is FPSCR. It is corrected here to 108, but this is unlikely to matter as FPSCR has little to no impact on unwinding. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf-regs: Add loongarch perf to DWARF register number mapping functions

2026-01-20T18:43:56+00:00

perf dwarf-regs: Add csky perf to dwarf register number mapping functions

2026-01-20T18:43:56+00:00

perf dwarf-regs: Add ARM perf to dwarf register number mapping functions

2026-01-20T18:43:56+00:00

perf dwarf-regs: Add basic get_dwarf_regnum() for most architectures

2026-01-20T18:43:56+00:00

Add a basic get_dwarf_regnum() implementation for most architectures by using the get_dwarf_regstr() tables and returning the index of the name within the table. Some minor name and constification clean up for csky. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf-regs: Add get_dwarf_regnum_for_perf_regnum() and use for x86 unwinding

2026-01-20T18:43:56+00:00

Add a utility to map a perf register number to a DWARF register number for a particular ELF machine type. Create a generic unwind-libdw initial register initialization routine that uses this function and thereby avoids arch specific initialization. The unwind-libdw code does: 1) compute the maximum DWARF register from the set of sampled user registers, 2) allocates a set of DWARF registers, 3) copies the sample registers into the appropriate DWARF registers. This generic solution is initially implemented for use with x86 as only get_dwarf_regnum_for_perf_regnum() support for x86 is currently present. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo