linux/tools/perf/arch/x86/annotate, branch master

perf disasm: Don't include C files from the arch directory

2026-01-23T19:58:38Z

Move the arch instructions.c files into appropriately named files in annotate-arch in the util directory. Don't #include to compile the code, switch to building the files and fix up the #includes accordingly. Move powerpc specific disasm code out of disasm.c and into annotate-powerpc.c. Declarations and static removed as appropriate for the code to compile as separate compilation units. The e_machine and e_flags set up is moved to the disasm.c architectures array so that later patches can sort by them. Reviewed-by: James Clark Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Athira Rajeev Cc: Bill Wendling Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Howard Chu Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Julia Lawall Cc: Justin Stitt Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Suchit Karunakaran Cc: Thomas Falcon Cc: Tianyou Li Cc: Will Deacon Cc: Zecheng Li Signed-off-by: Arnaldo Carvalho de Melo

perf disasm: Constify use of 'struct ins'

2026-01-23T19:58:38Z

The 'struct ins' holds variables that are read but not written, except during some initialization. Change most uses to be for a "const struct ins *" version to capture this immutability. So the x86__instructions can be const pre-sort it and make the sorted variable true. Reviewed-by: James Clark Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Athira Rajeev Cc: Bill Wendling Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Howard Chu Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Julia Lawall Cc: Justin Stitt Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Suchit Karunakaran Cc: Thomas Falcon Cc: Tianyou Li Cc: Will Deacon Cc: Zecheng Li Signed-off-by: Arnaldo Carvalho de Melo

perf disasm: Constify use of 'struct arch'

2026-01-23T19:58:38Z

The 'struct arch' holds variables that are read but not written, except during some initialization. Change most uses to be for a "const struct arch *" version to capture this immutability. Reviewed-by: James Clark Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Athira Rajeev Cc: Bill Wendling Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Howard Chu Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Julia Lawall Cc: Justin Stitt Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Suchit Karunakaran Cc: Thomas Falcon Cc: Tianyou Li Cc: Will Deacon Cc: Zecheng Li Signed-off-by: Arnaldo Carvalho de Melo

perf annotate: Invalidate register states for untracked instructions

2025-10-21T13:02:49Z

When tracking variable types, instructions that modify a pointer value in an untracked way can lead to incorrect type propagation. To prevent this, invalidate the register state when encountering such instructions. This change invalidates pointer types for various arithmetic and bitwise operations that current pointer offset tracking doesn't support, like imul, shl, and, inc, etc. A special case is added for 'xor reg, reg', which is a common idiom for zeroing a register. For this, the register state is updated to be a constant with a value of 0. This could introduce slight regressions if a variable is zeroed and then reused. This can be addressed in the future by using all DWARF locations for instruction tracking instead of only the first one. Signed-off-by: Zecheng Li Signed-off-by: Namhyung Kim

perf annotate: Save pointer offset in stack state

2025-10-21T13:02:49Z

The tracked pointer offset was not being preserved in the stack state, which could lead to incorrect type analysis. This change adds a ptr_offset field to the type_state_stack struct and passes it to set_stack_state and findnew_stack_state to ensure the offset is preserved after the pointer is loaded from a stack location. It improves the type annotation coverage and quality. Signed-off-by: Zecheng Li Signed-off-by: Namhyung Kim

perf annotate: Track arithmetic instructions on pointers

2025-10-21T13:02:49Z

Track the arithmetic operations on registers with pointer types. We handle only add, sub and lea instructions. The original pointer information needs to be preserved for getting outermost struct types. For example, reg0 points to a struct cfs_rq, when we add 0x10 to reg0, it should preserve the information of struct cfs_rq + 0x10 in the register instead of a pointer type to the child field at 0x10. Details: 1. struct type_state_reg now includes an offset, indicating if the register points to the start or an internal part of its associated type. This offset is used in mem to reg and reg to stack mem transfers, and also applied to the final type offset. 2. lea offset(%sp/%fp), reg is now treated as taking the address of a stack variable. It worked fine in most cases, but an issue with this approach is the pointer type may not exist. 3. lea offset(%base), reg is handled by moving the type from %base and adding an offset, similar to an add operation followed by a mov reg to reg. 4. Non-stack variables from DWARF with non-zero offsets in their location expressions are now accepted with register offset tracking. Multi-register addressing modes in LEA are not supported. Signed-off-by: Zecheng Li Signed-off-by: Namhyung Kim

perf annotate: Track address registers via TSR_KIND_POINTER

2025-10-21T13:02:49Z

Introduce TSR_KIND_POINTER to improve the data type profiler's ability to track pointer-based memory accesses and address register variables. TSR_KIND_POINTER represents that the location holds a pointer type to the type in the type state. The semantics match the `breg` registers that describe a memory location. This change implements handling for this new kind in mov instructions and in the check_matching_type() function. When a TSR_KIND_POINTER is moved to the stack, the stack state size is set to the architecture's pointer size. Signed-off-by: Zecheng Li Signed-off-by: Namhyung Kim

perf annotate: Rename TSR_KIND_POINTER to TSR_KIND_PERCPU_POINTER

2025-10-03T19:49:51Z

TSR_KIND_POINTER only represents percpu pointers currently. Rename it to TSR_KIND_PERCPU_POINTER so we can use the TSR_KIND_POINTER to represent pointer to a type. Reviewed-by: Namhyung Kim Signed-off-by: Zecheng Li Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Masami Hiramatsu Cc: Peter Zijlstra Cc: Xu Liu Signed-off-by: Arnaldo Carvalho de Melo

perf annotate-data: Handle direct use of stack pointer without fbreg

2025-02-26T21:42:49Z

Sometimes compiler generates code to use the stack pointer register without frame pointer. As we know RSP is the stack register on x86, let's treat it as same as fbreg. But the offset would be opposite direction so update the debug message accordingly. Reported-by: Blake Jones Link: https://lore.kernel.org/r/20250126210242.1181225-1-namhyung@kernel.org Signed-off-by: Namhyung Kim

perf disasm: Add e_machine/e_flags to struct arch

2024-11-09T16:39:13Z

Currently functions like get_dwarf_regnum only work with the host architecture. Carry the elf machine and flags in struct arch so that in disassembly these can be used to allow cross platform disassembly. Reviewed-by: Masami Hiramatsu (Google) Signed-off-by: Ian Rogers Cc: Anup Patel Cc: Yang Jihong Cc: Palmer Dabbelt Cc: David S. Miller Cc: Albert Ou Cc: Shenlin Liang Cc: Nick Terrell Cc: Guilherme Amadio Cc: Steinar H. Gunderson Cc: Changbin Du Cc: Alexander Lobakin Cc: Przemek Kitszel Cc: Huacai Chen Cc: Guo Ren Cc: Masahiro Yamada Cc: Will Deacon Cc: James Clark Cc: Mike Leach Cc: Chen Pei Cc: Leo Yan Cc: Oliver Upton Cc: Aditya Gupta Cc: Kajol Jain Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.org Cc: linux-riscv@lists.infradead.org Cc: Bibo Mao Cc: John Garry Cc: Atish Patra Cc: Dima Kogan Cc: Paul Walmsley Cc: Dr. David Alan Gilbert Cc: linux-csky@vger.kernel.org Link: https://lore.kernel.org/r/20241108234606.429459-5-irogers@google.com Signed-off-by: Namhyung Kim