diff options
Diffstat (limited to 'src/cmd/compile/internal/ppc64/ggen.go')
| -rw-r--r-- | src/cmd/compile/internal/ppc64/ggen.go | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ppc64/ggen.go b/src/cmd/compile/internal/ppc64/ggen.go index 3ae6422bf9..c76962cfb8 100644 --- a/src/cmd/compile/internal/ppc64/ggen.go +++ b/src/cmd/compile/internal/ppc64/ggen.go @@ -53,3 +53,30 @@ func ginsnop(pp *objw.Progs) *obj.Prog { p.To.Reg = ppc64.REG_R0 return p } + +func ginsnopdefer(pp *objw.Progs) *obj.Prog { + // On PPC64 two nops are required in the defer case. + // + // (see gc/cgen.go, gc/plive.go -- copy of comment below) + // + // On ppc64, when compiling Go into position + // independent code on ppc64le we insert an + // instruction to reload the TOC pointer from the + // stack as well. See the long comment near + // jmpdefer in runtime/asm_ppc64.s for why. + // If the MOVD is not needed, insert a hardware NOP + // so that the same number of instructions are used + // on ppc64 in both shared and non-shared modes. + + ginsnop(pp) + if base.Ctxt.Flag_shared { + p := pp.Prog(ppc64.AMOVD) + p.From.Type = obj.TYPE_MEM + p.From.Offset = 24 + p.From.Reg = ppc64.REGSP + p.To.Type = obj.TYPE_REG + p.To.Reg = ppc64.REG_R2 + return p + } + return ginsnop(pp) +} |