linux/tools/objtool/arch.h, branch v5.10

objtool: Decode unwind hint register depending on architecture

2020-09-10T15:43:13Z

The set of registers that can be included in an unwind hint and their encoding will depend on the architecture. Have arch specific code to decode that register. Signed-off-by: Julien Thierry Signed-off-by: Josh Poimboeuf

objtool: Define 'struct orc_entry' only when needed

2020-09-01T22:19:12Z

Implementation of ORC requires some definitions that are currently provided by the target architecture headers. Do not depend on these definitions when the orc subcommand is not implemented. This avoid requiring arches with no orc implementation to provide dummy orc definitions. Signed-off-by: Julien Thierry Reviewed-by: Miroslav Benes Signed-off-by: Josh Poimboeuf

Merge branch 'objtool/urgent' into objtool/core

2020-06-18T15:55:29Z

Conflicts: tools/objtool/elf.c tools/objtool/elf.h tools/objtool/orc_gen.c tools/objtool/check.c Signed-off-by: Peter Zijlstra (Intel)

objtool: Fix noinstr vs KCOV

2020-06-18T15:36:33Z

Since many compilers cannot disable KCOV with a function attribute, help it to NOP out any __sanitizer_cov_*() calls injected in noinstr code. This turns: 12: e8 00 00 00 00 callq 17 13: R_X86_64_PLT32 __sanitizer_cov_trace_pc-0x4 into: 12: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 13: R_X86_64_NONE __sanitizer_cov_trace_pc-0x4 Just like recordmcount does. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Dmitry Vyukov

objtool: Rename rela to reloc

2020-06-01T14:40:58Z

Before supporting additional relocation types rename the relevant types and functions from "rela" to "reloc". This work be done with the following regex: sed -e 's/struct rela/struct reloc/g' \ -e 's/$[_\*]$rela$s\{0,1\}$/\1reloc\2/g' \ -e 's/tmprela$s\{0,1\}$/tmpreloc\1/g' \ -e 's/relasec/relocsec/g' \ -e 's/rela_list/reloc_list/g' \ -e 's/rela_hash/reloc_hash/g' \ -e 's/add_rela/add_reloc/g' \ -e 's/rela->/reloc->/g' \ -e '/rela[,\.]/{ s/$[^\.>]$rela$[\.,]$/\1reloc\2/g ; }' \ -e 's/rela =/reloc =/g' \ -e 's/relas =/relocs =/g' \ -e 's/relas\[/relocs[/g' \ -e 's/relaname =/relocname =/g' \ -e 's/= rela\;/= reloc\;/g' \ -e 's/= relas\;/= relocs\;/g' \ -e 's/= relaname\;/= relocname\;/g' \ -e 's/, rela)/, reloc)/g' \ -e 's/$[ @]$rela$[ "]$/\1reloc\2/g' \ -e 's/ rela$/ reloc/g' \ -e 's/, relaname/, relocname/g' \ -e 's/sec->rela/sec->reloc/g' \ -e 's/($!\{0,1\}$rela/(\1reloc/g' \ -i \ arch.h \ arch/x86/decode.c \ check.c \ check.h \ elf.c \ elf.h \ orc_gen.c \ special.c Notable exceptions which complicate the regex include gelf_* library calls and standard/expected section names which still use "rela" because they encode the type of relocation expected. Also, keep "rela" in the struct because it encodes a specific type of relocation we currently expect. It will eventually turn into a member of an anonymous union when a susequent patch adds implicit addend, or "rel", relocation support. Signed-off-by: Matt Helsley Signed-off-by: Josh Poimboeuf

objtool: Enable compilation of objtool for all architectures

2020-05-20T14:17:28Z

Objtool currently only compiles for x86 architectures. This is fine as it presently does not support tooling for other architectures. However, we would like to be able to convert other kernel tools to run as objtool sub commands because they too process ELF object files. This will allow us to convert tools such as recordmcount to use objtool's ELF code. Since much of recordmcount's ELF code is copy-paste code to/from a variety of other kernel tools (look at modpost for example) this means that if we can convert recordmcount we can convert more. We define weak definitions for subcommand entry functions and other weak definitions for shared functions critical to building existing subcommands. These return 127 when the command is missing which signify tools that do not exist on all architectures. In this case the "check" and "orc" tools do not exist on all architectures so we only add them for x86. Future changes adding support for "check", to arm64 for example, can then modify the SUBCMD_CHECK variable when building for arm64. Objtool is not currently wired in to KConfig to be built for other architectures because it's not needed for those architectures and there are no commands it supports other than those for x86. As more command support is enabled on various architectures the necessary KConfig changes can be made (e.g. adding "STACK_VALIDATION") to trigger building objtool. [ jpoimboe: remove aliases, add __weak macro, add error messages ] Cc: Julien Thierry Signed-off-by: Matt Helsley Signed-off-by: Josh Poimboeuf

objtool: Move the IRET hack into the arch decoder

2020-04-30T18:14:33Z

Quoting Julien: "And the other suggestion is my other email was that you don't even need to add INSN_EXCEPTION_RETURN. You can keep IRET as INSN_CONTEXT_SWITCH by default and x86 decoder lookups the symbol conaining an iret. If it's a function symbol, it can just set the type to INSN_OTHER so that it caries on to the next instruction after having handled the stack_op." Suggested-by: Julien Thierry Signed-off-by: Miroslav Benes Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Miroslav Benes Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/20200428191659.913283807@infradead.org

objtool: Remove INSN_STACK

2020-04-30T18:14:33Z

With the unconditional use of handle_insn_ops(), INSN_STACK has lost its purpose. Remove it. Suggested-by: Julien Thierry Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Miroslav Benes Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/20200428191659.854203028@infradead.org

objtool: Constify arch_decode_instruction()

2020-04-23T06:34:18Z

Mostly straightforward constification, except that WARN_FUNC() needs a writable pointer while we have read-only pointers, so deflect this to WARN(). Acked-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Sami Tolvanen Cc: Thomas Gleixner Link: https://lore.kernel.org/r/20200422103205.61900-4-mingo@kernel.org

objtool: Rename struct cfi_state

2020-04-22T08:53:50Z

There's going to be a new struct cfi_state, rename this one to make place. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Miroslav Benes Reviewed-by: Alexandre Chartre Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/20200416115118.986441913@infradead.org Signed-off-by: Ingo Molnar