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The Global Offset Table (usually consists of. 1Īdrp x8, :got:var # R_AARCH64_ADR_GOT_PAGE The linker will create entries in the Global Offset Table. R_AARCH64_ADR_GOT_PAGE, R_X86_64_REX_GOTPCRELX) are called GOT-generating.
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The compiler emits code which uses position-independent addressing to extract the absolute virtual address from GOT. More commonly, the address is stored in the Global Offset Table (abbreviated as GOT). If the text section holds the address which is relocated by the dynamic relocation, this is called text relocations.
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See GNU indirect function for STT_GNU_IFUNC. The symbol is either potentially defined in another component or is a STT_GNU_IFUNC symbol. The linker emits a dynamic relocation to let the runtime loader perform a symbol lookup to determine the associated symbol value at runtime. Ldr w0, # R_AARCH64_LDST32_ABS_LO12_NCįor the third case, we need help from the runtime loader (abbreviated as ld.so). The text section can get the current program counter, then add the distance from PC to the symbol (PC-relative address), to compute the run-time virtual address. The first byte of the program image, the ELF header, is loaded at the load base. The difference between the link-time addresses of two symbols equals their virtual address difference at run-time. (For a FDPIC ABI for MMU-less Linux, the compiler may add an offset to the FDPIC register instead.) Load base plus constantįor the second case, this component is either a position-independent executable or a shared object.
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The text section can hold the absolute virtual address directly or use a PC-relative addressing. dependent on runtime computation by ld.soįor the first case, this component must be a position-dependent executable: a link-time address equals its virtual address at run-time.the load base plus a link-time constant.The reference arises from an address taken operation or a PLT entry. In an executable or shared object (called a component in ELF), a text section may need the absolute virtual address of a symbol (e.g.