[AAELF64] Add relocation metadata section - #419
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The PAuthABIELF64 and MemtagABIELF64 documents add additional ELF section types like SHT_AARCH64_AUTH_REL. Add these to the table of reserved section types. The build attributes section has now been defined by buildattr64 add a reference in the table.
The PAuthABI and MemtagABI have relocations that encode metadata in the place of the relocation. For some self-relocating systems this can cause a problem as the code running prior to or during relocation may need to access to the partial application of that relocation. For example accessing a global variable, required to be in the GOT because it can be tagged. Introduce an optional relocation metadata section containing an array of metadata entries that have a one to one correspondence to the relocation entries in its linked dynamic relocation section. Fixes: ARM-software#399
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The PAuthABI and MemtagABI have relocations that encode metadata in the place of the relocation. For some self-relocating systems this can cause a problem as the code running prior to or during relocation may need to access to the partial application of that relocation. For example accessing a global variable, required to be in the GOT because it can be tagged.
Introduce an optional relocation metadata section containing an array of metadata entries that have a one to one correspondence to the relocation entries in its linked dynamic relocation section.
Fixes: #399