| Using the GNU Compiler Collection (GCC): IA-64 Function Attributes |
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These function attributes are supported on IA-64 targets:
syscall_linkage
This attribute is used to modify the IA-64 calling convention by marking all input registers as live at all function exits. This makes it possible to restart a system call after an interrupt without having to save/restore the input registers. This also prevents kernel data from leaking into application code.
version_id
This IA-64 HP-UX attribute, attached to a global variable or function, renames a symbol to contain a version string, thus allowing for function level versioning. HP-UX system header files may use function level versioning for some system calls.
extern int foo () __attribute__((version_id ("20040821")));
Calls to foo are mapped to calls to foo{20040821}.