Changes in Makefile.vmlinux_o

e0cd396d - kbuild: fix typos "module.builtin" to "modules.builtin"

Mon, 12 May 2025 05:36:58 +0000

kbuild: fix typos "module.builtin" to "modules.builtin"The filenames in the comments do not match the actual generated files.Signed-off-by: Masahiro Yamada List of files: /linux-6.15/scripts/Makefile.vmlinux_o

876a4bce - objtool: Remove --no-unreachable for noinstr-only vmlinux.o runs

Mon, 24 Mar 2025 21:56:02 +0000

objtool: Remove --no-unreachable for noinstr-only vmlinux.o runsFor (!X86_KERNEL_IBT && !LTO_CLANG && NOINSTR_VALIDATION), objtool runson both translation units and vmlinux.o. The vmlinux.o run only doesnoinstr/noret validation. In that case --no-unreachable has no effect.Remove it.Note that for ((X86_KERNEL_IBT || LTO_CLANG) && KCOV), --no-unreachablestill gets set in objtool-args-y by scripts/Makefile.lib.Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://lore.kernel.org/r/05414246a0124db2f21b0d071b652aa9043d039d.1742852847.git.jpoimboe@kernel.org List of files: /linux-6.15/scripts/Makefile.vmlinux_o

4759670b - objtool: Fix CONFIG_OBJTOOL_WERROR for vmlinux.o

Mon, 24 Mar 2025 21:55:55 +0000

objtool: Fix CONFIG_OBJTOOL_WERROR for vmlinux.oWith (!X86_KERNEL_IBT && !LTO_CLANG && NOINSTR_VALIDATION), objtool runson both translation units and vmlinux.o. With CONFIG_OBJTOOL_WERROR,the TUs get --Werror but vmlinux.o doesn't. Fix that.Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://lore.kernel.org/r/4f71ab9b947ffc47b6a87dd3b9aff4bb32b36d0a.1742852846.git.jpoimboe@kernel.org List of files: /linux-6.15/scripts/Makefile.vmlinux_o

5f5e7344 - kbuild: generate offset range data for builtin modules

Fri, 06 Sep 2024 14:45:03 +0000

kbuild: generate offset range data for builtin modulesCreate file module.builtin.ranges that can be used to find wherebuilt-in modules are located by their addresses. This will be useful fortracing tools to find what functions are for various built-in modules.The offset range data for builtin modules is generated using: - modules.builtin: associates object files with module names - vmlinux.map: provides load order of sections and offset of first member per section - vmlinux.o.map: provides offset of object file content per section - .*.cmd: build cmd file with KBUILD_MODFILEThe generated data will look like:.text 00000000-00000000 = _text.text 0000baf0-0000cb10 amd_uncore.text 0009bd10-0009c8e0 iosf_mbi....text 00b9f080-00ba011a intel_skl_int3472_discrete.text 00ba0120-00ba03c0 intel_skl_int3472_discrete intel_skl_int3472_tps68470.text 00ba03c0-00ba08d6 intel_skl_int3472_tps68470....data 00000000-00000000 = _sdata.data 0000f020-0000f680 amd_uncoreFor each ELF section, it lists the offset of the first symbol. This canbe used to determine the base address of the section at runtime.Next, it lists (in strict ascending order) offset ranges in that sectionthat cover the symbols of one or more builtin modules. Multiple rangescan apply to a single module, and ranges can be shared between modules.The CONFIG_BUILTIN_MODULE_RANGES option controls whether offset range datais generated for kernel modules that are built into the kernel image.How it works: 1. The modules.builtin file is parsed to obtain a list of built-in module names and their associated object names (the .ko file that the module would be in if it were a loadable module, hereafter referred to as ). This object name can be used to identify objects in the kernel compile because any C or assembler code that ends up into a built-in module will have the option -DKBUILD_MODFILE= present in its build command, and those can be found in the ..cmd file in the kernel build tree. If an object is part of multiple modules, they will all be listed in the KBUILD_MODFILE option argument. This allows us to conclusively determine whether an object in the kernel build belong to any modules, and which. 2. The vmlinux.map is parsed next to determine the base address of each top level section so that all addresses into the section can be turned into offsets. This makes it possible to handle sections getting loaded at different addresses at system boot. We also determine an 'anchor' symbol at the beginning of each section to make it possible to calculate the true base address of a section at runtime (i.e. symbol address - symbol offset). We collect start addresses of sections that are included in the top level section. This is used when vmlinux is linked using vmlinux.o, because in that case, we need to look at the vmlinux.o linker map to know what object a symbol is found in. And finally, we process each symbol that is listed in vmlinux.map (or vmlinux.o.map) based on the following structure: vmlinux linked from vmlinux.a: vmlinux.map: -- might be same as top level section) -- built-in association known -- belongs to module(s) object belongs to ... vmlinux linked from vmlinux.o: vmlinux.map: -- might be same as top level section) vmlinux.o -- need to use vmlinux.o.map -- ignored ... vmlinux.o.map:

-- built-in association known -- belongs to module(s) object belongs to ... 3. As sections, objects, and symbols are processed, offset ranges are constructed in a straight-forward way: - If the symbol belongs to one or more built-in modules: - If we were working on the same module(s), extend the range to include this object - If we were working on another module(s), close that range, and start the new one - If the symbol does not belong to any built-in modules: - If we were working on a module(s) range, close that rangeSigned-off-by: Kris Van Hees Reviewed-by: Nick Alcock Reviewed-by: Alan Maguire Reviewed-by: Steven Rostedt (Google) Tested-by: Sam James Reviewed-by: Sami Tolvanen Tested-by: Sami Tolvanen Signed-off-by: Masahiro Yamada List of files: /linux-6.15/scripts/Makefile.vmlinux_o

8fb4ac1c - kbuild: fix typos "prequisites" to "prerequisites"

Sun, 18 Aug 2024 07:07:11 +0000

kbuild: fix typos "prequisites" to "prerequisites"This typo in scripts/Makefile.build has been present for more than 20years. It was accidentally copy-pasted to other scripts/Makefile.* files.Fix them all.Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor List of files: /linux-6.15/scripts/Makefile.vmlinux_o

a033eec9 - x86/bugs: Rename CONFIG_CPU_SRSO => CONFIG_MITIGATION_SRSO

Tue, 21 Nov 2023 16:07:36 +0000

x86/bugs: Rename CONFIG_CPU_SRSO => CONFIG_MITIGATION_SRSOStep 9/10 of the namespace unification of CPU mitigations related Kconfig options.Suggested-by: Josh Poimboeuf Signed-off-by: Breno Leitao Signed-off-by: Ingo Molnar Acked-by: Josh Poimboeuf Cc: Linus Torvalds Link: https://lore.kernel.org/r/20231121160740.1249350-10-leitao@debian.org List of files: /linux-6.15/scripts/Makefile.vmlinux_o

ac61d439 - x86/bugs: Rename CONFIG_CPU_UNRET_ENTRY => CONFIG_MITIGATION_UNRET_ENTRY

Tue, 21 Nov 2023 16:07:34 +0000

x86/bugs: Rename CONFIG_CPU_UNRET_ENTRY => CONFIG_MITIGATION_UNRET_ENTRYStep 7/10 of the namespace unification of CPU mitigations related Kconfig options.Suggested-by: Josh Poimboeuf Signed-off-by: Breno Leitao Signed-off-by: Ingo Molnar Acked-by: Josh Poimboeuf Cc: Linus Torvalds Link: https://lore.kernel.org/r/20231121160740.1249350-8-leitao@debian.org List of files: /linux-6.15/scripts/Makefile.vmlinux_o

eeb9f34d - x86/srso: Fix unret validation dependencies

Tue, 05 Sep 2023 05:04:53 +0000

x86/srso: Fix unret validation dependenciesCONFIG_CPU_SRSO isn't dependent on CONFIG_CPU_UNRET_ENTRY (AMDRetbleed), so the two features are independently configurable. Fixseveral issues for the (presumably rare) case where CONFIG_CPU_SRSO isenabled but CONFIG_CPU_UNRET_ENTRY isn't.Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Signed-off-by: Borislav Petkov (AMD) Acked-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/299fb7740174d0f2335e91c58af0e9c242b4bac1.1693889988.git.jpoimboe@kernel.org List of files: /linux-6.15/scripts/Makefile.vmlinux_o

7a342e6c - kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o

Wed, 28 Sep 2022 06:39:40 +0000

kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_oDo not build modules.builtin(.modinfo) as a side-effect of vmlinux.There are no good reason to rebuild them just because any of vmlinux'sprerequistes (vmlinux.lds, .vmlinux.export.c, etc.) has been updated.Signed-off-by: Masahiro Yamada List of files: /linux-6.15/scripts/Makefile.vmlinux_o

32164845 - kbuild: use obj-y instead extra-y for objects placed at the head

Sat, 24 Sep 2022 18:19:14 +0000

kbuild: use obj-y instead extra-y for objects placed at the headThe objects placed at the head of vmlinux need special treatments: - arch/$(SRCARCH)/Makefile adds them to head-y in order to place them before other archives in the linker command line. - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of obj-y to avoid them going into built-in.a.This commit gets rid of the latter.Create vmlinux.a to collect all the objects that are unconditionallylinked to vmlinux. The objects listed in head-y are moved to the headof vmlinux.a by using 'ar m'.With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-yfor builtin objects.There is no *.o that is directly linked to vmlinux. Drop unneeded codein scripts/clang-tools/gen_compile_commands.py.$(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggestedby Nathan Chancellor [1].[1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/Signed-off-by: Masahiro Yamada Tested-by: Nick Desaulniers Reviewed-by: Nicolas Schier List of files: /linux-6.15/scripts/Makefile.vmlinux_o

9ec6ab6e - kbuild: use objtool-args-y to clean up objtool arguments

Tue, 06 Sep 2022 18:49:35 +0000

kbuild: use objtool-args-y to clean up objtool argumentsBased on Linus' patch. Refactor scripts/Makefile.vmlinux_o as well.Link: https://lore.kernel.org/lkml/CAHk-=wgjTMQgiKzBZTmb=uWGDEQxDdyF1+qxBkODYciuNsmwnw@mail.gmail.com/Suggested-by: Linus Torvalds Signed-off-by: Masahiro Yamada Acked-by: Peter Zijlstra Reviewed-by: Nick Desaulniers List of files: /linux-6.15/scripts/Makefile.vmlinux_o

f43b9876 - x86/retbleed: Add fine grained Kconfig knobs

Mon, 27 Jun 2022 22:21:17 +0000

x86/retbleed: Add fine grained Kconfig knobsDo fine-grained Kconfig for all the various retbleed parts.NOTE: if your compiler doesn't support return thunks this willsilently 'upgrade' your mitigation to IBPB, you might not like this.Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov List of files: /linux-6.15/scripts/Makefile.vmlinux_o

a09a6e23 - objtool: Add entry UNRET validation

Tue, 14 Jun 2022 21:16:03 +0000

objtool: Add entry UNRET validationSince entry asm is tricky, add a validation pass that ensures theretbleed mitigation has been done before the first actual RETinstruction.Entry points are those that either have UNWIND_HINT_ENTRY, which actsas UNWIND_HINT_EMPTY but marks the instruction as an entry point, orthose that have UWIND_HINT_IRET_REGS at +0.This is basically a variant of validate_branch() that isintra-function and it will simply follow all branches from markedentry points and ensures that all paths lead to ANNOTATE_UNRET_END.If a path hits RET or an indirection the path is a fail and will bereported.There are 3 ANNOTATE_UNRET_END instances: - UNTRAIN_RET itself - exception from-kernel; this path doesn't need UNTRAIN_RET - all early exceptions; these also don't need UNTRAIN_RETSigned-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov Reviewed-by: Josh Poimboeuf Signed-off-by: Borislav Petkov List of files: /linux-6.15/scripts/Makefile.vmlinux_o

b42d2306 - kbuild: factor out the common objtool arguments

Sat, 28 May 2022 15:47:04 +0000

kbuild: factor out the common objtool argumentsscripts/Makefile.build and scripts/link-vmlinux.sh have similar setupsfor the objtool arguments.It was difficult to factor out them because all the vmlinux build ruleswere written in a shell script. It is somewhat tedious to touch the twofiles every time a new objtool option is supported.To reduce the code duplication, move the objtool for vmlinux.o intoscripts/Makefile.vmlinux_o. Then, move the common macros to Makefile.libso they are shared between Makefile.build and Makefile.vmlinux_o.Signed-off-by: Masahiro Yamada Tested-by: Sedat Dilek # LLVM-14 (x86-64) List of files: /linux-6.15/scripts/Makefile.vmlinux_o

5d45950d - kbuild: move vmlinux.o link to scripts/Makefile.vmlinux_o

Sat, 28 May 2022 15:47:03 +0000

kbuild: move vmlinux.o link to scripts/Makefile.vmlinux_oThis is a preparation for moving the objtool rule in the next commit.Signed-off-by: Masahiro Yamada Tested-by: Sedat Dilek # LLVM-14 (x86-64) List of files: /linux-6.15/scripts/Makefile.vmlinux_o