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| author | David Faust <david.faust@oracle.com> | 2022-12-07 11:51:59 -0800 |
|---|---|---|
| committer | David Faust <david.faust@oracle.com> | 2022-12-14 10:20:53 -0800 |
| commit | 70b303049e45c180236a4114f844311652bad002 (patch) | |
| tree | b43b62a7a552c0d8ca4a21596aaf950c50bbd3df /include/btf.h | |
| parent | 4f7aa145b796c044526c93f390e68f3b56a1b30a (diff) | |
| download | gcc-70b303049e45c180236a4114f844311652bad002.zip gcc-70b303049e45c180236a4114f844311652bad002.tar.gz gcc-70b303049e45c180236a4114f844311652bad002.tar.bz2 | |
btf: correct generation for extern funcs [PR106773]
The eBPF loader expects to find entries for functions declared as extern
in the corresponding BTF_KIND_DATASEC record, but we were not generating
these entries.
This patch adds support for the 'extern' linkage of function types in
BTF, and creates entries for for them BTF_KIND_DATASEC records as needed.
PR target/106773
gcc/
* btfout.cc (get_section_name): New function.
(btf_collect_datasec): Use it here. Process functions, marking them
'extern' and generating DATASEC entries for them as appropriate. Move
creation of BTF_KIND_FUNC records to here...
(btf_dtd_emit_preprocess_cb): ... from here.
gcc/testsuite/
* gcc.dg/debug/btf/btf-datasec-2.c: New test.
* gcc.dg/debug/btf/btf-function-6.c: New test.
include/
* btf.h (enum btf_func_linkage): New.
(struct btf_var_secinfo): Update comments with notes about extern
functions.
Diffstat (limited to 'include/btf.h')
| -rw-r--r-- | include/btf.h | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/include/btf.h b/include/btf.h index da62135..2f8f6f6 100644 --- a/include/btf.h +++ b/include/btf.h @@ -178,6 +178,15 @@ struct btf_param uint32_t type; /* Type of parameter. */ }; +/* BTF_KIND_FUNC records encode linkage information in the VLEN bits + of the type record. These are the supported values. */ +enum btf_func_linkage +{ + BTF_FUNC_STATIC = 0, + BTF_FUNC_GLOBAL = 1, + BTF_FUNC_EXTERN = 2, +}; + /* BTF_KIND_VAR records encode linkage information in a single trailing struct btf_var. These are the supported values. */ enum btf_var_linkage @@ -195,12 +204,13 @@ struct btf_var }; /* BTF_KIND_DATASEC is followed by VLEN struct btf_var_secinfo entries, - which describe all BTF_KIND_VAR types contained in the section. */ + which describe all BTF_KIND_VAR or extern BTF_KIND_FUNC types contained + in the section. */ struct btf_var_secinfo { - uint32_t type; /* Type of variable. */ - uint32_t offset; /* In-section offset of variable (in bytes). */ - uint32_t size; /* Size (in bytes) of variable. */ + uint32_t type; /* Type of BTF_KIND_VAR or BTF_KIND_FUNC item. */ + uint32_t offset; /* In-section offset (in bytes) of item. */ + uint32_t size; /* Size (in bytes) of item. */ }; /* BTF_KIND_ENUM64 is followed by VLEN struct btf_enum64 entries, |