diff options
Diffstat (limited to 'src/cmd/internal/obj/mips/obj0.go')
| -rw-r--r-- | src/cmd/internal/obj/mips/obj0.go | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/mips/obj0.go b/src/cmd/internal/obj/mips/obj0.go index 221fd428a3..12cfb31377 100644 --- a/src/cmd/internal/obj/mips/obj0.go +++ b/src/cmd/internal/obj/mips/obj0.go @@ -32,6 +32,7 @@ package mips import ( "cmd/internal/obj" "cmd/internal/sys" + "encoding/binary" "fmt" "math" ) @@ -533,6 +534,43 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) { } } + if ctxt.Mode&Mips32 != 0 { + // rewrite MOVD into two MOVF in 32-bit mode to avoid unaligned memory access + for p = cursym.Text; p != nil; p = p1 { + p1 = p.Link + + if p.As != AMOVD { + continue + } + if p.From.Type != obj.TYPE_MEM && p.To.Type != obj.TYPE_MEM { + continue + } + + p.As = AMOVF + q = ctxt.NewProg() + *q = *p + q.Link = p.Link + p.Link = q + p1 = q.Link + + var regOff int16 + if ctxt.Arch.ByteOrder == binary.BigEndian { + regOff = 1 // load odd register first + } + if p.From.Type == obj.TYPE_MEM { + reg := REG_F0 + (p.To.Reg-REG_F0)&^1 + p.To.Reg = reg + regOff + q.To.Reg = reg + 1 - regOff + q.From.Offset += 4 + } else if p.To.Type == obj.TYPE_MEM { + reg := REG_F0 + (p.From.Reg-REG_F0)&^1 + p.From.Reg = reg + regOff + q.From.Reg = reg + 1 - regOff + q.To.Offset += 4 + } + } + } + if nosched { // if we don't do instruction scheduling, simply add // NOP after each branch instruction. |