9c9090eb1d
They are usually needed when internally linking gcc code compiled with -Os. These are typically generated by ld or gold, but are missing when linking internally. The PPC64 ELF ABI describes a set of functions to save/restore non-volatile, callee-save registers using R1/R0/R12: _savegpr0_n: Save Rn-R31 relative to R1, save LR (in R0), return _restgpr0_n: Restore Rn-R31 from R1, and return to saved LR _savefpr_n: Save Fn-F31 based on R1, and save LR (in R0), return _restfpr_n: Restore Fn-F31 from R1, and return to 16(R1) _savegpr1_n: Save Rn-R31 based on R12, return _restgpr1_n: Restore Rn-R31 based on R12, return _savevr_m: Save VRm-VR31 based on R0, R12 is scratch, return _restvr_m: Restore VRm-VR31 based on R0, R12 is scratch, return m is a value 20<=m<=31 n is a value 14<=n<=31 Add several new functions similar to those suggested by the PPC64 ELFv2 ABI. And update the linker to scan external relocs for these calls, and redirect them to runtime.elf_<func>+offset in runtime/asm_ppc64x.go. Similarly, code which generates plt stubs is moved into a dedicated function. This avoids an extra scan of relocs. fixes #52336 Change-Id: I2f0f8b5b081a7b294dff5c92b4b1db8eba9a9400 Reviewed-on: https://go-review.googlesource.com/c/go/+/400796 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com> Run-TryBot: Paul Murphy <murp@ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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