71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
DWARF loader:
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- Handle DWARF5 DW_OP_addrx properly
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Part of the effort to support the subset of DWARF5 that is generated when building the kernel.
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- Handle subprogram ret type with abstract_origin properly
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Adds a second pass to resolve abstract origin DWARF description of functions to aid
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the BTF encoder in getting the right return type.
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- Check .notes section for LTO build info
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When LTO is used, currently only with clang, we need to do extra steps to handle references
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from one object (compile unit, aka CU) to another, a way for DWARF to avoid duplicating
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information.
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- Check .debug_abbrev for cross-CU references
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When the kernel build process doesn't add an ELF note in vmlinux indicating that LTO was
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used and thus intra-CU references are present and thus we need to use a more expensive
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way to resolve types and (again) thus to encode BTF, we need to look at DWARF's .debug_abbrev
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ELF section to figure out if such intra-CU references are present.
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- Permit merging all DWARF CU's for clang LTO built binary
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Allow not trowing away previously supposedly self contained compile units
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(objects, aka CU, aka Compile Units) as they have type descriptions that will
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be used in later CUs.
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- Permit a flexible HASHTAGS__BITS
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So that we can use a more expensive algorithm when we need to keep previously processed
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compile units that will then be referenced by later ones to resolve types.
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- Use a better hashing function, from libbpf
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Enabling patch to combine compile units when using LTO.
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BTF encoder:
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- Add --btf_gen_all flag
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A new command line to allow asking for the generation of all BTF encodings, so that we
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can stop adding new command line options to enable new encodings in the kernel Makefile.
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- Match ftrace addresses within ELF functions
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To cope with differences in how DWARF and ftrace describes function boundaries.
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- Funnel ELF error reporting through a macro
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To use libelf's elf_error() function, improving error messages.
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- Sanitize non-regular int base type
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Cope with clang with dwarf5 non-regular int base types, tricky stuff, see yhs
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full explanation in the relevant cset.
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- Add support for the floating-point types
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S/390 has floats'n'doubles in its arch specific linux headers, cope with that.
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Pretty printer:
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- Honour conf_fprintf.hex when printing enumerations
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If the user specifies --hex in the command line, honour it when printing enumerations.
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Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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