fd12f2aaeb
The Tag_ABI_VFP_args build attribute controls the procedure call standard used for floating point parameters on ARM. The values are: 0 - Base AAPCS (FP Parameters passed in Core (Integer) registers 1 - VFP AAPCS (FP Parameters passed in FP registers) 2 - Toolchain specific (Neither Base or VFP) 3 - Compatible with all (No use of floating point parameters) If the Tag_ABI_VFP_args build attribute is missing it has an implicit value of 0. We use the attribute in two ways: * Detect a clash in calling convention between Base, VFP and Toolchain. we follow ld.bfd's lead and do not error if there is a clash between an implicit Base AAPCS caused by a missing attribute. Many projects including the hard-float (VFP AAPCS) version of glibc contain assembler files that do not use floating point but do not have Tag_ABI_VFP_args. * Set the EF_ARM_ABI_FLOAT_SOFT or EF_ARM_ABI_FLOAT_HARD ELF header flag for Base or VFP AAPCS respectively. This flag is used by some ELF loaders. References: * Addenda to, and Errata in, the ABI for the ARM Architecture for Tag_ABI_VFP_args * Elf for the ARM Architecture for ELF header flags Fixes LLVM PR36009 PR: 229050 Obtained from: llvm r338377 by Peter Smith
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