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ef753d6605
linux/tools/objtool/include/objtool
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Josh Poimboeuf ef753d6605 objtool: Fix detection of consecutive jump tables on Clang 20 
The jump table detection code assumes jump tables are in the same order
as their corresponding indirect branches.  That's apparently not always
true with Clang 20.

Fix that by changing how multiple jump tables are detected.  In the
first detection pass, mark the beginning of each jump table so the
second pass can tell where one ends and the next one begins.

Fixes the following warnings:

  vmlinux.o: warning: objtool: SiS_GetCRT2Ptr+0x1ad: stack state mismatch: cfa1=4+8 cfa2=5+16
  sound/core/seq/snd-seq.o: warning: objtool: cc_ev_to_ump_midi2+0x589: return with modified stack frame

Fixes: be2f0b1e12 ("objtool: Get rid of reloc->jump_table_start")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/141752fff614eab962dba6bdfaa54aa67ff03bba.1742852846.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202503200535.J3hAvcjw-lkp@intel.com/
2025-03-25 09:20:25 +01:00
..
arch.h objtool: Handle PC relative relocation type 2025-03-12 15:43:38 -07:00
builtin.h objtool: Create backup on error and print args 2025-03-17 11:36:02 +01:00
cfi.h objtool: Allow stack operations in UNWIND_HINT_UNDEFINED regions 2023-06-07 10:03:11 -07:00
check.h objtool: Allow arch code to discover jump table size 2024-12-02 12:24:29 +01:00
elf.h objtool: Fix detection of consecutive jump tables on Clang 20 2025-03-25 09:20:25 +01:00
endianness.h objtool: Use target file endianness instead of a compiled constant 2022-11-18 19:00:15 +11:00
objtool.h objtool: Remove instruction::list 2023-02-23 09:21:44 +01:00
orc.h objtool/x86: Separate arch-specific and generic parts 2024-03-11 22:23:47 +08:00
special.h objtool: Fix C jump table annotations for Clang 2025-02-25 09:46:16 -08:00
warn.h objtool: Change "warning:" to "error:" for --Werror 2025-03-17 11:36:02 +01:00