https://bugs.llvm.org/show_bug.cgi?id=36727
Bug ID: 36727
Summary: Add support for R_AARCH64_TLSLE_LDST8_TPREL_LO12
relocation.
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: peter.sm...@linaro.org
CC: llvm-bugs@lists.llvm.org
In https://reviews.llvm.org/D44355 an attempt was made to fold the sequence:
mrs x1, TPIDR_EL0
add x2, x1, :tprel_hi12:local_exec_var
add x3, x2, :tprel_lo12_nc:local_exec_var
ldr w0, [x3]
to:
mrs x1, TPIDR_EL0
add x2, x1, :tprel_hi12:local_exec_var
ldr w0, [x2, :tprel_lo12_nc:local_exec_var]
Which unfortunately had to be reverted for ELF because no ELF linker supported
the R_AARCH64_TLSLE_LDST8_TPREL_LO12 relocation that is needed for:
ldr w0, [x2, :tprel_lo12_nc:local_exec_var].
Existing ELF linkers only implement R_AARCH64_TLSLE_ADD_TPREL_LO12_NC to
support
add x3, x2, :tprel_lo12_nc:local_exec_var
It would be nice to implement this relocation to eventually enable this
relaxation to be done for ELF targets. This will take some time as support will
need to be added to the binutils linkers as well.
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