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Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 97eaacf..e06caf3 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -16015,6 +16015,57 @@ read_y (struct S *arg) @end smallexample @enddefbuiltin +@defbuiltin{{unsigned int} __builtin_preserve_enum_value (@var{type}, @var{enum}, unsigned int @var{kind})} +BPF Compile Once-Run Everywhere (CO-RE) support. This builtin collects enum +information and creates a CO-RE relocation relative to @var{enum} that should +be of @var{type}. The @var{kind} specifies the action performed. + +The following values are supported for @var{kind}: +@table @code +@item ENUM_VALUE_EXISTS = 0 +The return value is either 0 or 1 depending if the enum value exists in the +target. + +@item ENUM_VALUE = 1 +The return value is the enum value in the target kernel. +@end table +@enddefbuiltin + +@defbuiltin{{unsigned int} __builtin_btf_type_id (@var{type}, unsigned int @var{kind})} +BPF Compile Once-Run Everywhere (CO-RE) support. This builtin is used to get +the BTF type ID of a specified type. Depending on the @var{kind} argument, it +will either return the ID of the local BTF information, or the BTF type ID in +the target kernel. + +The following values are supported for @var{kind}: +@table @code +@item BTF_TYPE_ID_LOCAL = 0 +Return the local BTF type ID. Always succeeds. + +@item BTF_TYPE_ID_TARGET = 1 +Return the target BTF type ID. If type does not exist in the target, returns 0. +@end table +@enddefbuiltin + +@defbuiltin{{unsigned int} __builtin_preserve_type_info (@var{type}, unsigned int @var{kind})} +BPF Compile Once-Run Everywhere (CO-RE) support. This builtin performs named +type (struct/union/enum/typedef) verifications. The type of verification +dependents on the @var{kind} argument provided. This builtin will always +return 0 if type does not exists in the target kernel. + +The following values are supported for @var{kind}: +@table @code +@item BTF_TYPE_EXISTS = 0 +Checks if type exists in the target. + +@item BTF_TYPE_MATCHES = 1 +Checks if type matches the local definition in the target kernel. + +@item BTF_TYPE_SIZE = 2 +Returns the size of the type within the target. +@end table +@enddefbuiltin + @node FR-V Built-in Functions @subsection FR-V Built-in Functions |