https://bugs.llvm.org/show_bug.cgi?id=36009
Bug ID: 36009
Summary: Setting VFP Flag on ELF binaries
Product: lld
Version: unspecified
Hardware: Other
OS: FreeBSD
Status: NEW
Severity: enhancement
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: kev...@freebsd.org
CC: llvm-bugs@lists.llvm.org
Hi,
We're working on linking the FreeBSD base system with LLD on ARMv7. We've
discovered that LLD is not setting the VFP flag on the ELFs it's producing,
which we need for rtld to use the hard-float libraries.
Using -target armv7-gnueabihf-freebsd12.0 yields, as an example, the following:
ELF Header:
Magic: 7f 45 4c 46 01 01 01 09 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: FreeBSD
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x14000
Start of program headers: 52 (bytes into file)
Start of section headers: 170068 (bytes into file)
Flags: 0x5000000, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 11
Size of section headers: 40 (bytes)
Number of section headers: 34
Section header string table index: 31
Hacking it in by OR'ing EF_ARM_VFP_FLOAT here:
http://src.illumos.org/source/xref/freebsd-head/contrib/llvm/tools/lld/ELF/Arch/ARM.cpp#103
at least gives me a bootable system that works so far, but this is presumably
not ideal. =)
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