Linker and Libraries Guide

Register Symbols

The SPARC architecture supports register symbols, which are symbols that initialize a global register. A symbol table entry for a register symbol contains the entries that are listed in the following table.

Table 7–22 SPARC: ELF Symbol Table Entry: Register Symbol


Field	Meaning
`st_name`	Index into the string table for the name of the symbol, or the value `0` for a scratch register.
`st_value`	Register number. See the ABI manual for integer register assignments.
`st_size`	Unused (`0`).
`st_info`	Bind is typically `STB_GLOBAL`, type must be `STT_SPARC_REGISTER`.
`st_other`	Unused (`0`).
`st_shndx`	`SHN_ABS` if this object initializes this register symbol,`SHN_UNDEF` otherwise.

The register values that are defined for SPARC are listed in the following table.

Table 7–23 SPARC: ELF Register Numbers


Name	Value	Meaning
`STO_SPARC_REGISTER_G2`	`0x2`	`%g2`
`STO_SPARC_REGISTER_G3`	`0x3`	`%g3`

Absence of an entry for a particular global register means that the particular global register is not used at all by the object.