1252 lines
28 KiB
Go
1252 lines
28 KiB
Go
// cmd/9l/noop.c, cmd/9l/pass.c, cmd/9l/span.c from Vita Nuova.
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
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// Portions Copyright © 1997-1999 Vita Nuova Limited
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// Portions Copyright © 2000-2008 Vita Nuova Holdings Limited (www.vitanuova.com)
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// Portions Copyright © 2004,2006 Bruce Ellis
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// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
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// Revisions Copyright © 2000-2008 Lucent Technologies Inc. and others
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// Portions Copyright © 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package ppc64
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import (
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"fmt"
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"math"
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"github.com/google/gops/internal/obj"
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"github.com/google/gops/internal/sys"
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)
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func progedit(ctxt *obj.Link, p *obj.Prog) {
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p.From.Class = 0
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p.To.Class = 0
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// Rewrite BR/BL to symbol as TYPE_BRANCH.
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switch p.As {
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case ABR,
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ABL,
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obj.ARET,
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obj.ADUFFZERO,
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obj.ADUFFCOPY:
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if p.To.Sym != nil {
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p.To.Type = obj.TYPE_BRANCH
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}
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}
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// Rewrite float constants to values stored in memory.
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switch p.As {
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case AFMOVS:
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if p.From.Type == obj.TYPE_FCONST {
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f32 := float32(p.From.Val.(float64))
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i32 := math.Float32bits(f32)
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literal := fmt.Sprintf("$f32.%08x", i32)
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s := obj.Linklookup(ctxt, literal, 0)
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s.Size = 4
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = s
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p.From.Sym.Set(obj.AttrLocal, true)
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p.From.Name = obj.NAME_EXTERN
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p.From.Offset = 0
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}
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case AFMOVD:
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if p.From.Type == obj.TYPE_FCONST {
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i64 := math.Float64bits(p.From.Val.(float64))
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literal := fmt.Sprintf("$f64.%016x", i64)
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s := obj.Linklookup(ctxt, literal, 0)
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s.Size = 8
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = s
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p.From.Sym.Set(obj.AttrLocal, true)
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p.From.Name = obj.NAME_EXTERN
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p.From.Offset = 0
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}
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// Put >32-bit constants in memory and load them
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case AMOVD:
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if p.From.Type == obj.TYPE_CONST && p.From.Name == obj.NAME_NONE && p.From.Reg == 0 && int64(int32(p.From.Offset)) != p.From.Offset {
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literal := fmt.Sprintf("$i64.%016x", uint64(p.From.Offset))
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s := obj.Linklookup(ctxt, literal, 0)
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s.Size = 8
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = s
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p.From.Sym.Set(obj.AttrLocal, true)
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p.From.Name = obj.NAME_EXTERN
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p.From.Offset = 0
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}
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}
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// Rewrite SUB constants into ADD.
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switch p.As {
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case ASUBC:
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if p.From.Type == obj.TYPE_CONST {
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p.From.Offset = -p.From.Offset
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p.As = AADDC
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}
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case ASUBCCC:
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if p.From.Type == obj.TYPE_CONST {
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p.From.Offset = -p.From.Offset
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p.As = AADDCCC
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}
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case ASUB:
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if p.From.Type == obj.TYPE_CONST {
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p.From.Offset = -p.From.Offset
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p.As = AADD
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}
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}
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if ctxt.Flag_dynlink {
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rewriteToUseGot(ctxt, p)
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}
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}
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// Rewrite p, if necessary, to access global data via the global offset table.
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func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog) {
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if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO {
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// ADUFFxxx $offset
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// becomes
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// MOVD runtime.duffxxx@GOT, R12
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// ADD $offset, R12
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// MOVD R12, CTR
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// BL (CTR)
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var sym *obj.LSym
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if p.As == obj.ADUFFZERO {
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sym = obj.Linklookup(ctxt, "runtime.duffzero", 0)
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} else {
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sym = obj.Linklookup(ctxt, "runtime.duffcopy", 0)
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}
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offset := p.To.Offset
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p.As = AMOVD
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p.From.Type = obj.TYPE_MEM
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p.From.Name = obj.NAME_GOTREF
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p.From.Sym = sym
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R12
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p.To.Name = obj.NAME_NONE
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p.To.Offset = 0
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p.To.Sym = nil
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p1 := obj.Appendp(ctxt, p)
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p1.As = AADD
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p1.From.Type = obj.TYPE_CONST
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p1.From.Offset = offset
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p1.To.Type = obj.TYPE_REG
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p1.To.Reg = REG_R12
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p2 := obj.Appendp(ctxt, p1)
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p2.As = AMOVD
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p2.From.Type = obj.TYPE_REG
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p2.From.Reg = REG_R12
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p2.To.Type = obj.TYPE_REG
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p2.To.Reg = REG_CTR
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p3 := obj.Appendp(ctxt, p2)
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p3.As = obj.ACALL
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p3.From.Type = obj.TYPE_REG
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p3.From.Reg = REG_R12
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p3.To.Type = obj.TYPE_REG
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p3.To.Reg = REG_CTR
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}
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// We only care about global data: NAME_EXTERN means a global
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// symbol in the Go sense, and p.Sym.Local is true for a few
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// internally defined symbols.
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if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() {
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// MOVD $sym, Rx becomes MOVD sym@GOT, Rx
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// MOVD $sym+<off>, Rx becomes MOVD sym@GOT, Rx; ADD <off>, Rx
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if p.As != AMOVD {
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ctxt.Diag("do not know how to handle TYPE_ADDR in %v with -dynlink", p)
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}
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if p.To.Type != obj.TYPE_REG {
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ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v with -dynlink", p)
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}
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p.From.Type = obj.TYPE_MEM
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p.From.Name = obj.NAME_GOTREF
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if p.From.Offset != 0 {
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q := obj.Appendp(ctxt, p)
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q.As = AADD
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = p.From.Offset
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q.To = p.To
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p.From.Offset = 0
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}
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}
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if p.From3 != nil && p.From3.Name == obj.NAME_EXTERN {
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ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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var source *obj.Addr
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// MOVx sym, Ry becomes MOVD sym@GOT, REGTMP; MOVx (REGTMP), Ry
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// MOVx Ry, sym becomes MOVD sym@GOT, REGTMP; MOVx Ry, (REGTMP)
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// An addition may be inserted between the two MOVs if there is an offset.
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if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() {
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if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() {
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ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p)
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}
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source = &p.From
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} else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() {
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source = &p.To
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} else {
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return
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}
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if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP {
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return
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}
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if source.Sym.Type == obj.STLSBSS {
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return
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}
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if source.Type != obj.TYPE_MEM {
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ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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p1 := obj.Appendp(ctxt, p)
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p2 := obj.Appendp(ctxt, p1)
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p1.As = AMOVD
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p1.From.Type = obj.TYPE_MEM
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p1.From.Sym = source.Sym
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p1.From.Name = obj.NAME_GOTREF
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p1.To.Type = obj.TYPE_REG
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p1.To.Reg = REGTMP
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p2.As = p.As
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p2.From = p.From
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p2.To = p.To
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if p.From.Name == obj.NAME_EXTERN {
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p2.From.Reg = REGTMP
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p2.From.Name = obj.NAME_NONE
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p2.From.Sym = nil
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} else if p.To.Name == obj.NAME_EXTERN {
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p2.To.Reg = REGTMP
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p2.To.Name = obj.NAME_NONE
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p2.To.Sym = nil
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} else {
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return
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}
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obj.Nopout(p)
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}
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func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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// TODO(minux): add morestack short-cuts with small fixed frame-size.
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ctxt.Cursym = cursym
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if cursym.Text == nil || cursym.Text.Link == nil {
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return
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}
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p := cursym.Text
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textstksiz := p.To.Offset
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if textstksiz == -8 {
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// Compatibility hack.
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p.From3.Offset |= obj.NOFRAME
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textstksiz = 0
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}
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if textstksiz%8 != 0 {
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ctxt.Diag("frame size %d not a multiple of 8", textstksiz)
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}
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if p.From3.Offset&obj.NOFRAME != 0 {
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if textstksiz != 0 {
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ctxt.Diag("NOFRAME functions must have a frame size of 0, not %d", textstksiz)
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}
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}
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cursym.Args = p.To.Val.(int32)
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cursym.Locals = int32(textstksiz)
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/*
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* find leaf subroutines
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* strip NOPs
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* expand RET
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* expand BECOME pseudo
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*/
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if ctxt.Debugvlog != 0 {
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ctxt.Logf("%5.2f noops\n", obj.Cputime())
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}
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var q *obj.Prog
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var q1 *obj.Prog
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for p := cursym.Text; p != nil; p = p.Link {
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switch p.As {
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/* too hard, just leave alone */
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case obj.ATEXT:
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q = p
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p.Mark |= LABEL | LEAF | SYNC
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if p.Link != nil {
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p.Link.Mark |= LABEL
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}
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case ANOR:
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q = p
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if p.To.Type == obj.TYPE_REG {
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if p.To.Reg == REGZERO {
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p.Mark |= LABEL | SYNC
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}
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}
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case ALWAR,
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ALBAR,
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ASTBCCC,
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ASTWCCC,
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AECIWX,
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AECOWX,
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AEIEIO,
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AICBI,
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AISYNC,
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ATLBIE,
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ATLBIEL,
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ASLBIA,
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ASLBIE,
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ASLBMFEE,
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ASLBMFEV,
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ASLBMTE,
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ADCBF,
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ADCBI,
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ADCBST,
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ADCBT,
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ADCBTST,
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ADCBZ,
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ASYNC,
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ATLBSYNC,
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APTESYNC,
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ALWSYNC,
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ATW,
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AWORD,
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ARFI,
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ARFCI,
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ARFID,
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AHRFID:
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q = p
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p.Mark |= LABEL | SYNC
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continue
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case AMOVW, AMOVWZ, AMOVD:
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q = p
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if p.From.Reg >= REG_SPECIAL || p.To.Reg >= REG_SPECIAL {
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p.Mark |= LABEL | SYNC
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}
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continue
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case AFABS,
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AFABSCC,
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AFADD,
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AFADDCC,
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AFCTIW,
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AFCTIWCC,
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AFCTIWZ,
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AFCTIWZCC,
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AFDIV,
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AFDIVCC,
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AFMADD,
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AFMADDCC,
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AFMOVD,
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AFMOVDU,
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/* case AFMOVDS: */
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AFMOVS,
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AFMOVSU,
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/* case AFMOVSD: */
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AFMSUB,
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AFMSUBCC,
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AFMUL,
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AFMULCC,
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AFNABS,
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AFNABSCC,
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AFNEG,
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AFNEGCC,
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AFNMADD,
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AFNMADDCC,
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AFNMSUB,
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AFNMSUBCC,
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AFRSP,
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AFRSPCC,
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AFSUB,
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AFSUBCC:
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q = p
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p.Mark |= FLOAT
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continue
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case ABL,
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ABCL,
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obj.ADUFFZERO,
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obj.ADUFFCOPY:
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cursym.Text.Mark &^= LEAF
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fallthrough
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case ABC,
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ABEQ,
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ABGE,
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ABGT,
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ABLE,
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ABLT,
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ABNE,
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ABR,
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ABVC,
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ABVS:
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p.Mark |= BRANCH
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q = p
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q1 = p.Pcond
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if q1 != nil {
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for q1.As == obj.ANOP {
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q1 = q1.Link
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p.Pcond = q1
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}
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if q1.Mark&LEAF == 0 {
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q1.Mark |= LABEL
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}
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} else {
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p.Mark |= LABEL
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}
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q1 = p.Link
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if q1 != nil {
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q1.Mark |= LABEL
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}
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continue
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case AFCMPO, AFCMPU:
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q = p
|
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p.Mark |= FCMP | FLOAT
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continue
|
|
|
|
case obj.ARET:
|
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q = p
|
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if p.Link != nil {
|
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p.Link.Mark |= LABEL
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}
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continue
|
|
|
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case obj.ANOP:
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q1 = p.Link
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q.Link = q1 /* q is non-nop */
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q1.Mark |= p.Mark
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continue
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|
|
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default:
|
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q = p
|
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continue
|
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}
|
|
}
|
|
|
|
autosize := int32(0)
|
|
var p1 *obj.Prog
|
|
var p2 *obj.Prog
|
|
for p := cursym.Text; p != nil; p = p.Link {
|
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o := p.As
|
|
switch o {
|
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case obj.ATEXT:
|
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autosize = int32(textstksiz)
|
|
|
|
if p.Mark&LEAF != 0 && autosize == 0 {
|
|
// A leaf function with no locals has no frame.
|
|
p.From3.Offset |= obj.NOFRAME
|
|
}
|
|
|
|
if p.From3.Offset&obj.NOFRAME == 0 {
|
|
// If there is a stack frame at all, it includes
|
|
// space to save the LR.
|
|
autosize += int32(ctxt.FixedFrameSize())
|
|
}
|
|
|
|
if p.Mark&LEAF != 0 && autosize < obj.StackSmall {
|
|
// A leaf function with a small stack can be marked
|
|
// NOSPLIT, avoiding a stack check.
|
|
p.From3.Offset |= obj.NOSPLIT
|
|
}
|
|
|
|
p.To.Offset = int64(autosize)
|
|
|
|
q = p
|
|
|
|
if ctxt.Flag_shared && cursym.Name != "runtime.duffzero" && cursym.Name != "runtime.duffcopy" && cursym.Name != "runtime.stackBarrier" {
|
|
// When compiling Go into PIC, all functions must start
|
|
// with instructions to load the TOC pointer into r2:
|
|
//
|
|
// addis r2, r12, .TOC.-func@ha
|
|
// addi r2, r2, .TOC.-func@l+4
|
|
//
|
|
// We could probably skip this prologue in some situations
|
|
// but it's a bit subtle. However, it is both safe and
|
|
// necessary to leave the prologue off duffzero and
|
|
// duffcopy as we rely on being able to jump to a specific
|
|
// instruction offset for them, and stackBarrier is only
|
|
// ever called from an overwritten LR-save slot on the
|
|
// stack (when r12 will not be remotely the right thing)
|
|
// but fortunately does not access global data.
|
|
//
|
|
// These are AWORDS because there is no (afaict) way to
|
|
// generate the addis instruction except as part of the
|
|
// load of a large constant, and in that case there is no
|
|
// way to use r12 as the source.
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AWORD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = 0x3c4c0000
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AWORD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = 0x38420000
|
|
rel := obj.Addrel(ctxt.Cursym)
|
|
rel.Off = 0
|
|
rel.Siz = 8
|
|
rel.Sym = obj.Linklookup(ctxt, ".TOC.", 0)
|
|
rel.Type = obj.R_ADDRPOWER_PCREL
|
|
}
|
|
|
|
if cursym.Text.From3.Offset&obj.NOSPLIT == 0 {
|
|
q = stacksplit(ctxt, q, autosize) // emit split check
|
|
}
|
|
|
|
if autosize != 0 {
|
|
// Make sure to save link register for non-empty frame, even if
|
|
// it is a leaf function, so that traceback works.
|
|
if cursym.Text.Mark&LEAF == 0 && autosize >= -BIG && autosize <= BIG {
|
|
// Use MOVDU to adjust R1 when saving R31, if autosize is small.
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_LR
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REGTMP
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVDU
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REGTMP
|
|
q.To.Type = obj.TYPE_MEM
|
|
q.To.Offset = int64(-autosize)
|
|
q.To.Reg = REGSP
|
|
q.Spadj = int32(autosize)
|
|
} else {
|
|
// Frame size is too large for a MOVDU instruction.
|
|
// Store link register before decrementing SP, so if a signal comes
|
|
// during the execution of the function prologue, the traceback
|
|
// code will not see a half-updated stack frame.
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_LR
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R29 // REGTMP may be used to synthesize large offset in the next instruction
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_R29
|
|
q.To.Type = obj.TYPE_MEM
|
|
q.To.Offset = int64(-autosize)
|
|
q.To.Reg = REGSP
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AADD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = int64(-autosize)
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REGSP
|
|
q.Spadj = +autosize
|
|
}
|
|
} else if cursym.Text.Mark&LEAF == 0 {
|
|
// A very few functions that do not return to their caller
|
|
// (e.g. gogo) are not identified as leaves but still have
|
|
// no frame.
|
|
cursym.Text.Mark |= LEAF
|
|
}
|
|
|
|
if cursym.Text.Mark&LEAF != 0 {
|
|
cursym.Set(obj.AttrLeaf, true)
|
|
break
|
|
}
|
|
|
|
if ctxt.Flag_shared {
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_R2
|
|
q.To.Type = obj.TYPE_MEM
|
|
q.To.Reg = REGSP
|
|
q.To.Offset = 24
|
|
}
|
|
|
|
if cursym.Text.From3.Offset&obj.WRAPPER != 0 {
|
|
// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
|
|
//
|
|
// MOVD g_panic(g), R3
|
|
// CMP R0, R3
|
|
// BEQ end
|
|
// MOVD panic_argp(R3), R4
|
|
// ADD $(autosize+8), R1, R5
|
|
// CMP R4, R5
|
|
// BNE end
|
|
// ADD $8, R1, R6
|
|
// MOVD R6, panic_argp(R3)
|
|
// end:
|
|
// NOP
|
|
//
|
|
// The NOP is needed to give the jumps somewhere to land.
|
|
// It is a liblink NOP, not a ppc64 NOP: it encodes to 0 instruction bytes.
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
|
|
q.As = AMOVD
|
|
q.From.Type = obj.TYPE_MEM
|
|
q.From.Reg = REGG
|
|
q.From.Offset = 4 * int64(ctxt.Arch.PtrSize) // G.panic
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R3
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ACMP
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_R0
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R3
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ABEQ
|
|
q.To.Type = obj.TYPE_BRANCH
|
|
p1 = q
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.From.Type = obj.TYPE_MEM
|
|
q.From.Reg = REG_R3
|
|
q.From.Offset = 0 // Panic.argp
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R4
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AADD
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = int64(autosize) + ctxt.FixedFrameSize()
|
|
q.Reg = REGSP
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R5
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ACMP
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_R4
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R5
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ABNE
|
|
q.To.Type = obj.TYPE_BRANCH
|
|
p2 = q
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AADD
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = ctxt.FixedFrameSize()
|
|
q.Reg = REGSP
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R6
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_R6
|
|
q.To.Type = obj.TYPE_MEM
|
|
q.To.Reg = REG_R3
|
|
q.To.Offset = 0 // Panic.argp
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
|
|
q.As = obj.ANOP
|
|
p1.Pcond = q
|
|
p2.Pcond = q
|
|
}
|
|
|
|
case obj.ARET:
|
|
if p.From.Type == obj.TYPE_CONST {
|
|
ctxt.Diag("using BECOME (%v) is not supported!", p)
|
|
break
|
|
}
|
|
|
|
retTarget := p.To.Sym
|
|
|
|
if cursym.Text.Mark&LEAF != 0 {
|
|
if autosize == 0 {
|
|
p.As = ABR
|
|
p.From = obj.Addr{}
|
|
if retTarget == nil {
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_LR
|
|
} else {
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
p.To.Sym = retTarget
|
|
}
|
|
p.Mark |= BRANCH
|
|
break
|
|
}
|
|
|
|
p.As = AADD
|
|
p.From.Type = obj.TYPE_CONST
|
|
p.From.Offset = int64(autosize)
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REGSP
|
|
p.Spadj = -autosize
|
|
|
|
q = ctxt.NewProg()
|
|
q.As = ABR
|
|
q.Lineno = p.Lineno
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_LR
|
|
q.Mark |= BRANCH
|
|
q.Spadj = +autosize
|
|
|
|
q.Link = p.Link
|
|
p.Link = q
|
|
break
|
|
}
|
|
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Offset = 0
|
|
p.From.Reg = REGSP
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REGTMP
|
|
|
|
q = ctxt.NewProg()
|
|
q.As = AMOVD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REGTMP
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_LR
|
|
|
|
q.Link = p.Link
|
|
p.Link = q
|
|
p = q
|
|
|
|
if false {
|
|
// Debug bad returns
|
|
q = ctxt.NewProg()
|
|
|
|
q.As = AMOVD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_MEM
|
|
q.From.Offset = 0
|
|
q.From.Reg = REGTMP
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REGTMP
|
|
|
|
q.Link = p.Link
|
|
p.Link = q
|
|
p = q
|
|
}
|
|
|
|
if autosize != 0 {
|
|
q = ctxt.NewProg()
|
|
q.As = AADD
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = int64(autosize)
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REGSP
|
|
q.Spadj = -autosize
|
|
|
|
q.Link = p.Link
|
|
p.Link = q
|
|
}
|
|
|
|
q1 = ctxt.NewProg()
|
|
q1.As = ABR
|
|
q1.Lineno = p.Lineno
|
|
if retTarget == nil {
|
|
q1.To.Type = obj.TYPE_REG
|
|
q1.To.Reg = REG_LR
|
|
} else {
|
|
q1.To.Type = obj.TYPE_BRANCH
|
|
q1.To.Sym = retTarget
|
|
}
|
|
q1.Mark |= BRANCH
|
|
q1.Spadj = +autosize
|
|
|
|
q1.Link = q.Link
|
|
q.Link = q1
|
|
case AADD:
|
|
if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.From.Type == obj.TYPE_CONST {
|
|
p.Spadj = int32(-p.From.Offset)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
// instruction scheduling
|
|
if(debug['Q'] == 0)
|
|
return;
|
|
|
|
curtext = nil;
|
|
q = nil; // p - 1
|
|
q1 = firstp; // top of block
|
|
o = 0; // count of instructions
|
|
for(p = firstp; p != nil; p = p1) {
|
|
p1 = p->link;
|
|
o++;
|
|
if(p->mark & NOSCHED){
|
|
if(q1 != p){
|
|
sched(q1, q);
|
|
}
|
|
for(; p != nil; p = p->link){
|
|
if(!(p->mark & NOSCHED))
|
|
break;
|
|
q = p;
|
|
}
|
|
p1 = p;
|
|
q1 = p;
|
|
o = 0;
|
|
continue;
|
|
}
|
|
if(p->mark & (LABEL|SYNC)) {
|
|
if(q1 != p)
|
|
sched(q1, q);
|
|
q1 = p;
|
|
o = 1;
|
|
}
|
|
if(p->mark & (BRANCH|SYNC)) {
|
|
sched(q1, p);
|
|
q1 = p1;
|
|
o = 0;
|
|
}
|
|
if(o >= NSCHED) {
|
|
sched(q1, p);
|
|
q1 = p1;
|
|
o = 0;
|
|
}
|
|
q = p;
|
|
}
|
|
*/
|
|
func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
|
|
p0 := p // save entry point, but skipping the two instructions setting R2 in shared mode
|
|
|
|
// MOVD g_stackguard(g), R3
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Reg = REGG
|
|
p.From.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0
|
|
if ctxt.Cursym.CFunc() {
|
|
p.From.Offset = 3 * int64(ctxt.Arch.PtrSize) // G.stackguard1
|
|
}
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R3
|
|
|
|
var q *obj.Prog
|
|
if framesize <= obj.StackSmall {
|
|
// small stack: SP < stackguard
|
|
// CMP stackguard, SP
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = ACMPU
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R3
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REGSP
|
|
} else if framesize <= obj.StackBig {
|
|
// large stack: SP-framesize < stackguard-StackSmall
|
|
// ADD $-framesize, SP, R4
|
|
// CMP stackguard, R4
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = AADD
|
|
p.From.Type = obj.TYPE_CONST
|
|
p.From.Offset = int64(-framesize)
|
|
p.Reg = REGSP
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R4
|
|
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = ACMPU
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R3
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R4
|
|
} else {
|
|
// Such a large stack we need to protect against wraparound.
|
|
// If SP is close to zero:
|
|
// SP-stackguard+StackGuard <= framesize + (StackGuard-StackSmall)
|
|
// The +StackGuard on both sides is required to keep the left side positive:
|
|
// SP is allowed to be slightly below stackguard. See stack.h.
|
|
//
|
|
// Preemption sets stackguard to StackPreempt, a very large value.
|
|
// That breaks the math above, so we have to check for that explicitly.
|
|
// // stackguard is R3
|
|
// CMP R3, $StackPreempt
|
|
// BEQ label-of-call-to-morestack
|
|
// ADD $StackGuard, SP, R4
|
|
// SUB R3, R4
|
|
// MOVD $(framesize+(StackGuard-StackSmall)), R31
|
|
// CMPU R31, R4
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = ACMP
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R3
|
|
p.To.Type = obj.TYPE_CONST
|
|
p.To.Offset = obj.StackPreempt
|
|
|
|
p = obj.Appendp(ctxt, p)
|
|
q = p
|
|
p.As = ABEQ
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = AADD
|
|
p.From.Type = obj.TYPE_CONST
|
|
p.From.Offset = obj.StackGuard
|
|
p.Reg = REGSP
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R4
|
|
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = ASUB
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R3
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R4
|
|
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_CONST
|
|
p.From.Offset = int64(framesize) + obj.StackGuard - obj.StackSmall
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REGTMP
|
|
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = ACMPU
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REGTMP
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R4
|
|
}
|
|
|
|
// q1: BLT done
|
|
p = obj.Appendp(ctxt, p)
|
|
q1 := p
|
|
|
|
p.As = ABLT
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
|
|
// MOVD LR, R5
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_LR
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R5
|
|
if q != nil {
|
|
q.Pcond = p
|
|
}
|
|
|
|
var morestacksym *obj.LSym
|
|
if ctxt.Cursym.CFunc() {
|
|
morestacksym = obj.Linklookup(ctxt, "runtime.morestackc", 0)
|
|
} else if ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0 {
|
|
morestacksym = obj.Linklookup(ctxt, "runtime.morestack_noctxt", 0)
|
|
} else {
|
|
morestacksym = obj.Linklookup(ctxt, "runtime.morestack", 0)
|
|
}
|
|
|
|
if ctxt.Flag_shared {
|
|
// In PPC64 PIC code, R2 is used as TOC pointer derived from R12
|
|
// which is the address of function entry point when entering
|
|
// the function. We need to preserve R2 across call to morestack.
|
|
// Fortunately, in shared mode, 8(SP) and 16(SP) are reserved in
|
|
// the caller's frame, but not used (0(SP) is caller's saved LR,
|
|
// 24(SP) is caller's saved R2). Use 8(SP) to save this function's R2.
|
|
|
|
// MOVD R12, 8(SP)
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R2
|
|
p.To.Type = obj.TYPE_MEM
|
|
p.To.Reg = REGSP
|
|
p.To.Offset = 8
|
|
}
|
|
|
|
if ctxt.Flag_dynlink {
|
|
// Avoid calling morestack via a PLT when dynamically linking. The
|
|
// PLT stubs generated by the system linker on ppc64le when "std r2,
|
|
// 24(r1)" to save the TOC pointer in their callers stack
|
|
// frame. Unfortunately (and necessarily) morestack is called before
|
|
// the function that calls it sets up its frame and so the PLT ends
|
|
// up smashing the saved TOC pointer for its caller's caller.
|
|
//
|
|
// According to the ABI documentation there is a mechanism to avoid
|
|
// the TOC save that the PLT stub does (put a R_PPC64_TOCSAVE
|
|
// relocation on the nop after the call to morestack) but at the time
|
|
// of writing it is not supported at all by gold and my attempt to
|
|
// use it with ld.bfd caused an internal linker error. So this hack
|
|
// seems preferable.
|
|
|
|
// MOVD $runtime.morestack(SB), R12
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Sym = morestacksym
|
|
p.From.Name = obj.NAME_GOTREF
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R12
|
|
|
|
// MOVD R12, CTR
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R12
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_CTR
|
|
|
|
// BL CTR
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = obj.ACALL
|
|
p.From.Type = obj.TYPE_REG
|
|
p.From.Reg = REG_R12
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_CTR
|
|
} else {
|
|
// BL runtime.morestack(SB)
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = ABL
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
p.To.Sym = morestacksym
|
|
}
|
|
|
|
if ctxt.Flag_shared {
|
|
// MOVD 8(SP), R2
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = AMOVD
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Reg = REGSP
|
|
p.From.Offset = 8
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REG_R2
|
|
}
|
|
|
|
// BR start
|
|
p = obj.Appendp(ctxt, p)
|
|
p.As = ABR
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
p.Pcond = p0.Link
|
|
|
|
// placeholder for q1's jump target
|
|
p = obj.Appendp(ctxt, p)
|
|
|
|
p.As = obj.ANOP // zero-width place holder
|
|
q1.Pcond = p
|
|
|
|
return p
|
|
}
|
|
|
|
func follow(ctxt *obj.Link, s *obj.LSym) {
|
|
ctxt.Cursym = s
|
|
|
|
firstp := ctxt.NewProg()
|
|
lastp := firstp
|
|
xfol(ctxt, s.Text, &lastp)
|
|
lastp.Link = nil
|
|
s.Text = firstp.Link
|
|
}
|
|
|
|
func relinv(a obj.As) obj.As {
|
|
switch a {
|
|
case ABEQ:
|
|
return ABNE
|
|
case ABNE:
|
|
return ABEQ
|
|
|
|
case ABGE:
|
|
return ABLT
|
|
case ABLT:
|
|
return ABGE
|
|
|
|
case ABGT:
|
|
return ABLE
|
|
case ABLE:
|
|
return ABGT
|
|
|
|
case ABVC:
|
|
return ABVS
|
|
case ABVS:
|
|
return ABVC
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) {
|
|
var q *obj.Prog
|
|
var r *obj.Prog
|
|
var b obj.As
|
|
var i int
|
|
|
|
loop:
|
|
if p == nil {
|
|
return
|
|
}
|
|
a := p.As
|
|
if a == ABR {
|
|
q = p.Pcond
|
|
if (p.Mark&NOSCHED != 0) || q != nil && (q.Mark&NOSCHED != 0) {
|
|
p.Mark |= FOLL
|
|
(*last).Link = p
|
|
*last = p
|
|
p = p.Link
|
|
xfol(ctxt, p, last)
|
|
p = q
|
|
if p != nil && p.Mark&FOLL == 0 {
|
|
goto loop
|
|
}
|
|
return
|
|
}
|
|
|
|
if q != nil {
|
|
p.Mark |= FOLL
|
|
p = q
|
|
if p.Mark&FOLL == 0 {
|
|
goto loop
|
|
}
|
|
}
|
|
}
|
|
|
|
if p.Mark&FOLL != 0 {
|
|
i = 0
|
|
q = p
|
|
for ; i < 4; i, q = i+1, q.Link {
|
|
if q == *last || (q.Mark&NOSCHED != 0) {
|
|
break
|
|
}
|
|
b = 0 /* set */
|
|
a = q.As
|
|
if a == obj.ANOP {
|
|
i--
|
|
continue
|
|
}
|
|
|
|
if a == ABR || a == obj.ARET || a == ARFI || a == ARFCI || a == ARFID || a == AHRFID {
|
|
goto copy
|
|
}
|
|
if q.Pcond == nil || (q.Pcond.Mark&FOLL != 0) {
|
|
continue
|
|
}
|
|
b = relinv(a)
|
|
if b == 0 {
|
|
continue
|
|
}
|
|
|
|
copy:
|
|
for {
|
|
r = ctxt.NewProg()
|
|
*r = *p
|
|
if r.Mark&FOLL == 0 {
|
|
fmt.Printf("can't happen 1\n")
|
|
}
|
|
r.Mark |= FOLL
|
|
if p != q {
|
|
p = p.Link
|
|
(*last).Link = r
|
|
*last = r
|
|
continue
|
|
}
|
|
|
|
(*last).Link = r
|
|
*last = r
|
|
if a == ABR || a == obj.ARET || a == ARFI || a == ARFCI || a == ARFID || a == AHRFID {
|
|
return
|
|
}
|
|
r.As = b
|
|
r.Pcond = p.Link
|
|
r.Link = p.Pcond
|
|
if r.Link.Mark&FOLL == 0 {
|
|
xfol(ctxt, r.Link, last)
|
|
}
|
|
if r.Pcond.Mark&FOLL == 0 {
|
|
fmt.Printf("can't happen 2\n")
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
a = ABR
|
|
q = ctxt.NewProg()
|
|
q.As = a
|
|
q.Lineno = p.Lineno
|
|
q.To.Type = obj.TYPE_BRANCH
|
|
q.To.Offset = p.Pc
|
|
q.Pcond = p
|
|
p = q
|
|
}
|
|
|
|
p.Mark |= FOLL
|
|
(*last).Link = p
|
|
*last = p
|
|
if a == ABR || a == obj.ARET || a == ARFI || a == ARFCI || a == ARFID || a == AHRFID {
|
|
if p.Mark&NOSCHED != 0 {
|
|
p = p.Link
|
|
goto loop
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
if p.Pcond != nil {
|
|
if a != ABL && p.Link != nil {
|
|
xfol(ctxt, p.Link, last)
|
|
p = p.Pcond
|
|
if p == nil || (p.Mark&FOLL != 0) {
|
|
return
|
|
}
|
|
goto loop
|
|
}
|
|
}
|
|
|
|
p = p.Link
|
|
goto loop
|
|
}
|
|
|
|
var Linkppc64 = obj.LinkArch{
|
|
Arch: sys.ArchPPC64,
|
|
Preprocess: preprocess,
|
|
Assemble: span9,
|
|
Follow: follow,
|
|
Progedit: progedit,
|
|
}
|
|
|
|
var Linkppc64le = obj.LinkArch{
|
|
Arch: sys.ArchPPC64LE,
|
|
Preprocess: preprocess,
|
|
Assemble: span9,
|
|
Follow: follow,
|
|
Progedit: progedit,
|
|
}
|