736 lines
19 KiB
Go
736 lines
19 KiB
Go
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// Based on cmd/internal/obj/ppc64/obj9.go.
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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 s390x
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import (
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"github.com/twitchyliquid64/golang-asm/obj"
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"github.com/twitchyliquid64/golang-asm/objabi"
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"github.com/twitchyliquid64/golang-asm/sys"
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"math"
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)
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func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
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p.From.Class = 0
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p.To.Class = 0
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c := ctxtz{ctxt: ctxt, newprog: newprog}
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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, ABL, obj.ARET, obj.ADUFFZERO, 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 unless they are +0.
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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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if math.Float32bits(f32) == 0 { // +0
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break
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}
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = ctxt.Float32Sym(f32)
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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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f64 := p.From.Val.(float64)
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if math.Float64bits(f64) == 0 { // +0
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break
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}
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = ctxt.Float64Sym(f64)
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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 constants not loadable by LOAD IMMEDIATE into memory
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case AMOVD:
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if p.From.Type == obj.TYPE_CONST {
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val := p.From.Offset
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if int64(int32(val)) != val &&
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int64(uint32(val)) != val &&
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int64(uint64(val)&(0xffffffff<<32)) != val {
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = ctxt.Int64Sym(p.From.Offset)
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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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}
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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 && isint32(-p.From.Offset) {
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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 ASUB:
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if p.From.Type == obj.TYPE_CONST && isint32(-p.From.Offset) {
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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 c.ctxt.Flag_dynlink {
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c.rewriteToUseGot(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 (c *ctxtz) rewriteToUseGot(p *obj.Prog) {
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// At the moment EXRL instructions are not emitted by the compiler and only reference local symbols in
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// assembly code.
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if p.As == AEXRL {
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return
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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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// Rewrites must not clobber flags and therefore cannot use the
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// ADD instruction.
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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 or REGTMP2; MOVD $<off>(Rx or REGTMP2), Rx
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if p.To.Type != obj.TYPE_REG || p.As != AMOVD {
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c.ctxt.Diag("do not know how to handle LEA-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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q := p
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if p.From.Offset != 0 {
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target := p.To.Reg
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if target == REG_R0 {
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// Cannot use R0 as input to address calculation.
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// REGTMP might be used by the assembler.
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p.To.Reg = REGTMP2
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}
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q = obj.Appendp(q, c.newprog)
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q.As = AMOVD
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q.From.Type = obj.TYPE_ADDR
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q.From.Offset = p.From.Offset
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q.From.Reg = p.To.Reg
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q.To.Type = obj.TYPE_REG
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q.To.Reg = target
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p.From.Offset = 0
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}
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}
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if p.GetFrom3() != nil && p.GetFrom3().Name == obj.NAME_EXTERN {
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c.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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// MOVD sym, Ry becomes MOVD sym@GOT, REGTMP2; MOVD (REGTMP2), Ry
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// MOVD Ry, sym becomes MOVD sym@GOT, REGTMP2; MOVD Ry, (REGTMP2)
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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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c.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 == objabi.STLSBSS {
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return
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}
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if source.Type != obj.TYPE_MEM {
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c.ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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p1 := obj.Appendp(p, c.newprog)
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p2 := obj.Appendp(p1, c.newprog)
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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 = REGTMP2
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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 = REGTMP2
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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 = REGTMP2
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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, newprog obj.ProgAlloc) {
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// TODO(minux): add morestack short-cuts with small fixed frame-size.
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if cursym.Func.Text == nil || cursym.Func.Text.Link == nil {
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return
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}
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c := ctxtz{ctxt: ctxt, cursym: cursym, newprog: newprog}
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p := c.cursym.Func.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.From.Sym.Set(obj.AttrNoFrame, true)
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textstksiz = 0
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}
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if textstksiz%8 != 0 {
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c.ctxt.Diag("frame size %d not a multiple of 8", textstksiz)
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}
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if p.From.Sym.NoFrame() {
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if textstksiz != 0 {
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c.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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c.cursym.Func.Args = p.To.Val.(int32)
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c.cursym.Func.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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*/
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var q *obj.Prog
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for p := c.cursym.Func.Text; p != nil; p = p.Link {
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switch p.As {
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case obj.ATEXT:
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q = p
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p.Mark |= LEAF
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case ABL, ABCL:
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q = p
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c.cursym.Func.Text.Mark &^= LEAF
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fallthrough
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||
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case ABC,
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ABRC,
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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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ABLEU,
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ABLTU,
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ABNE,
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ABR,
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ABVC,
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ABVS,
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ACRJ,
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ACGRJ,
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|
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ACLRJ,
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ACLGRJ,
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ACIJ,
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ACGIJ,
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|
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ACLIJ,
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|
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ACLGIJ,
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|
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ACMPBEQ,
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ACMPBGE,
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ACMPBGT,
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ACMPBLE,
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ACMPBLT,
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ACMPBNE,
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ACMPUBEQ,
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ACMPUBGE,
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ACMPUBGT,
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ACMPUBLE,
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ACMPUBLT,
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|
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ACMPUBNE:
|
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|
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q = p
|
||
|
|
p.Mark |= BRANCH
|
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|
|
|
||
|
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default:
|
||
|
|
q = p
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
autosize := int32(0)
|
||
|
|
var pLast *obj.Prog
|
||
|
|
var pPre *obj.Prog
|
||
|
|
var pPreempt *obj.Prog
|
||
|
|
wasSplit := false
|
||
|
|
for p := c.cursym.Func.Text; p != nil; p = p.Link {
|
||
|
|
pLast = p
|
||
|
|
switch p.As {
|
||
|
|
case obj.ATEXT:
|
||
|
|
autosize = int32(textstksiz)
|
||
|
|
|
||
|
|
if p.Mark&LEAF != 0 && autosize == 0 {
|
||
|
|
// A leaf function with no locals has no frame.
|
||
|
|
p.From.Sym.Set(obj.AttrNoFrame, true)
|
||
|
|
}
|
||
|
|
|
||
|
|
if !p.From.Sym.NoFrame() {
|
||
|
|
// If there is a stack frame at all, it includes
|
||
|
|
// space to save the LR.
|
||
|
|
autosize += int32(c.ctxt.FixedFrameSize())
|
||
|
|
}
|
||
|
|
|
||
|
|
if p.Mark&LEAF != 0 && autosize < objabi.StackSmall {
|
||
|
|
// A leaf function with a small stack can be marked
|
||
|
|
// NOSPLIT, avoiding a stack check.
|
||
|
|
p.From.Sym.Set(obj.AttrNoSplit, true)
|
||
|
|
}
|
||
|
|
|
||
|
|
p.To.Offset = int64(autosize)
|
||
|
|
|
||
|
|
q := p
|
||
|
|
|
||
|
|
if !p.From.Sym.NoSplit() {
|
||
|
|
p, pPreempt = c.stacksplitPre(p, autosize) // emit pre part of split check
|
||
|
|
pPre = p
|
||
|
|
p = c.ctxt.EndUnsafePoint(p, c.newprog, -1)
|
||
|
|
wasSplit = true //need post part of split
|
||
|
|
}
|
||
|
|
|
||
|
|
if autosize != 0 {
|
||
|
|
// Make sure to save link register for non-empty frame, even if
|
||
|
|
// it is a leaf function, so that traceback works.
|
||
|
|
// 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.
|
||
|
|
// This sequence is not async preemptible, as if we open a frame
|
||
|
|
// at the current SP, it will clobber the saved LR.
|
||
|
|
q = c.ctxt.StartUnsafePoint(p, c.newprog)
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AMOVD
|
||
|
|
q.From.Type = obj.TYPE_REG
|
||
|
|
q.From.Reg = REG_LR
|
||
|
|
q.To.Type = obj.TYPE_MEM
|
||
|
|
q.To.Reg = REGSP
|
||
|
|
q.To.Offset = int64(-autosize)
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AMOVD
|
||
|
|
q.From.Type = obj.TYPE_ADDR
|
||
|
|
q.From.Offset = int64(-autosize)
|
||
|
|
q.From.Reg = REGSP // not actually needed - REGSP is assumed if no reg is provided
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REGSP
|
||
|
|
q.Spadj = autosize
|
||
|
|
|
||
|
|
q = c.ctxt.EndUnsafePoint(q, c.newprog, -1)
|
||
|
|
} else if c.cursym.Func.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.
|
||
|
|
c.cursym.Func.Text.Mark |= LEAF
|
||
|
|
}
|
||
|
|
|
||
|
|
if c.cursym.Func.Text.Mark&LEAF != 0 {
|
||
|
|
c.cursym.Set(obj.AttrLeaf, true)
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
if c.cursym.Func.Text.From.Sym.Wrapper() {
|
||
|
|
// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
|
||
|
|
//
|
||
|
|
// MOVD g_panic(g), R3
|
||
|
|
// CMP R3, $0
|
||
|
|
// 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 s390x NOP: it encodes to 0 instruction bytes.
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
|
||
|
|
q.As = AMOVD
|
||
|
|
q.From.Type = obj.TYPE_MEM
|
||
|
|
q.From.Reg = REGG
|
||
|
|
q.From.Offset = 4 * int64(c.ctxt.Arch.PtrSize) // G.panic
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_R3
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = ACMP
|
||
|
|
q.From.Type = obj.TYPE_REG
|
||
|
|
q.From.Reg = REG_R3
|
||
|
|
q.To.Type = obj.TYPE_CONST
|
||
|
|
q.To.Offset = 0
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = ABEQ
|
||
|
|
q.To.Type = obj.TYPE_BRANCH
|
||
|
|
p1 := q
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
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(q, c.newprog)
|
||
|
|
q.As = AADD
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = int64(autosize) + c.ctxt.FixedFrameSize()
|
||
|
|
q.Reg = REGSP
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_R5
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
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(q, c.newprog)
|
||
|
|
q.As = ABNE
|
||
|
|
q.To.Type = obj.TYPE_BRANCH
|
||
|
|
p2 := q
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AADD
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = c.ctxt.FixedFrameSize()
|
||
|
|
q.Reg = REGSP
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_R6
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
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(q, c.newprog)
|
||
|
|
|
||
|
|
q.As = obj.ANOP
|
||
|
|
p1.To.SetTarget(q)
|
||
|
|
p2.To.SetTarget(q)
|
||
|
|
}
|
||
|
|
|
||
|
|
case obj.ARET:
|
||
|
|
retTarget := p.To.Sym
|
||
|
|
|
||
|
|
if c.cursym.Func.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 = obj.Appendp(p, c.newprog)
|
||
|
|
q.As = ABR
|
||
|
|
q.From = obj.Addr{}
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_LR
|
||
|
|
q.Mark |= BRANCH
|
||
|
|
q.Spadj = autosize
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_MEM
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
p.From.Offset = 0
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REG_LR
|
||
|
|
|
||
|
|
q = p
|
||
|
|
|
||
|
|
if autosize != 0 {
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AADD
|
||
|
|
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 = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = ABR
|
||
|
|
q.From = obj.Addr{}
|
||
|
|
if retTarget == nil {
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_LR
|
||
|
|
} else {
|
||
|
|
q.To.Type = obj.TYPE_BRANCH
|
||
|
|
q.To.Sym = retTarget
|
||
|
|
}
|
||
|
|
q.Mark |= BRANCH
|
||
|
|
q.Spadj = autosize
|
||
|
|
|
||
|
|
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)
|
||
|
|
}
|
||
|
|
|
||
|
|
case obj.AGETCALLERPC:
|
||
|
|
if cursym.Leaf() {
|
||
|
|
/* MOVD LR, Rd */
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_REG
|
||
|
|
p.From.Reg = REG_LR
|
||
|
|
} else {
|
||
|
|
/* MOVD (RSP), Rd */
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_MEM
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if wasSplit {
|
||
|
|
c.stacksplitPost(pLast, pPre, pPreempt, autosize) // emit post part of split check
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *ctxtz) stacksplitPre(p *obj.Prog, framesize int32) (*obj.Prog, *obj.Prog) {
|
||
|
|
var q *obj.Prog
|
||
|
|
|
||
|
|
// MOVD g_stackguard(g), R3
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_MEM
|
||
|
|
p.From.Reg = REGG
|
||
|
|
p.From.Offset = 2 * int64(c.ctxt.Arch.PtrSize) // G.stackguard0
|
||
|
|
if c.cursym.CFunc() {
|
||
|
|
p.From.Offset = 3 * int64(c.ctxt.Arch.PtrSize) // G.stackguard1
|
||
|
|
}
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REG_R3
|
||
|
|
|
||
|
|
// Mark the stack bound check and morestack call async nonpreemptible.
|
||
|
|
// If we get preempted here, when resumed the preemption request is
|
||
|
|
// cleared, but we'll still call morestack, which will double the stack
|
||
|
|
// unnecessarily. See issue #35470.
|
||
|
|
p = c.ctxt.StartUnsafePoint(p, c.newprog)
|
||
|
|
|
||
|
|
q = nil
|
||
|
|
if framesize <= objabi.StackSmall {
|
||
|
|
// small stack: SP < stackguard
|
||
|
|
// CMPUBGE stackguard, SP, label-of-call-to-morestack
|
||
|
|
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
//q1 = p
|
||
|
|
p.From.Type = obj.TYPE_REG
|
||
|
|
p.From.Reg = REG_R3
|
||
|
|
p.Reg = REGSP
|
||
|
|
p.As = ACMPUBGE
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
|
||
|
|
} else if framesize <= objabi.StackBig {
|
||
|
|
// large stack: SP-framesize < stackguard-StackSmall
|
||
|
|
// ADD $-(framesize-StackSmall), SP, R4
|
||
|
|
// CMPUBGE stackguard, R4, label-of-call-to-morestack
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
|
||
|
|
p.As = AADD
|
||
|
|
p.From.Type = obj.TYPE_CONST
|
||
|
|
p.From.Offset = -(int64(framesize) - objabi.StackSmall)
|
||
|
|
p.Reg = REGSP
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REG_R4
|
||
|
|
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
p.From.Type = obj.TYPE_REG
|
||
|
|
p.From.Reg = REG_R3
|
||
|
|
p.Reg = REG_R4
|
||
|
|
p.As = ACMPUBGE
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
|
||
|
|
} 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)), TEMP
|
||
|
|
// CMPUBGE TEMP, R4, label-of-call-to-morestack
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type = obj.TYPE_REG
|
||
|
|
p.From.Reg = REG_R3
|
||
|
|
p.To.Type = obj.TYPE_CONST
|
||
|
|
p.To.Offset = objabi.StackPreempt
|
||
|
|
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
q = p
|
||
|
|
p.As = ABEQ
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
p.As = AADD
|
||
|
|
p.From.Type = obj.TYPE_CONST
|
||
|
|
p.From.Offset = int64(objabi.StackGuard)
|
||
|
|
p.Reg = REGSP
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REG_R4
|
||
|
|
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
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(p, c.newprog)
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_CONST
|
||
|
|
p.From.Offset = int64(framesize) + int64(objabi.StackGuard) - objabi.StackSmall
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REGTMP
|
||
|
|
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
p.From.Type = obj.TYPE_REG
|
||
|
|
p.From.Reg = REGTMP
|
||
|
|
p.Reg = REG_R4
|
||
|
|
p.As = ACMPUBGE
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
}
|
||
|
|
|
||
|
|
return p, q
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *ctxtz) stacksplitPost(p *obj.Prog, pPre *obj.Prog, pPreempt *obj.Prog, framesize int32) *obj.Prog {
|
||
|
|
// Now we are at the end of the function, but logically
|
||
|
|
// we are still in function prologue. We need to fix the
|
||
|
|
// SP data and PCDATA.
|
||
|
|
spfix := obj.Appendp(p, c.newprog)
|
||
|
|
spfix.As = obj.ANOP
|
||
|
|
spfix.Spadj = -framesize
|
||
|
|
|
||
|
|
pcdata := c.ctxt.EmitEntryStackMap(c.cursym, spfix, c.newprog)
|
||
|
|
pcdata = c.ctxt.StartUnsafePoint(pcdata, c.newprog)
|
||
|
|
|
||
|
|
// MOVD LR, R5
|
||
|
|
p = obj.Appendp(pcdata, c.newprog)
|
||
|
|
pPre.To.SetTarget(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 pPreempt != nil {
|
||
|
|
pPreempt.To.SetTarget(p)
|
||
|
|
}
|
||
|
|
|
||
|
|
// BL runtime.morestack(SB)
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
|
||
|
|
p.As = ABL
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
if c.cursym.CFunc() {
|
||
|
|
p.To.Sym = c.ctxt.Lookup("runtime.morestackc")
|
||
|
|
} else if !c.cursym.Func.Text.From.Sym.NeedCtxt() {
|
||
|
|
p.To.Sym = c.ctxt.Lookup("runtime.morestack_noctxt")
|
||
|
|
} else {
|
||
|
|
p.To.Sym = c.ctxt.Lookup("runtime.morestack")
|
||
|
|
}
|
||
|
|
|
||
|
|
p = c.ctxt.EndUnsafePoint(p, c.newprog, -1)
|
||
|
|
|
||
|
|
// BR start
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
|
||
|
|
p.As = ABR
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
p.To.SetTarget(c.cursym.Func.Text.Link)
|
||
|
|
return p
|
||
|
|
}
|
||
|
|
|
||
|
|
var unaryDst = map[obj.As]bool{
|
||
|
|
ASTCK: true,
|
||
|
|
ASTCKC: true,
|
||
|
|
ASTCKE: true,
|
||
|
|
ASTCKF: true,
|
||
|
|
ANEG: true,
|
||
|
|
ANEGW: true,
|
||
|
|
AVONE: true,
|
||
|
|
AVZERO: true,
|
||
|
|
}
|
||
|
|
|
||
|
|
var Links390x = obj.LinkArch{
|
||
|
|
Arch: sys.ArchS390X,
|
||
|
|
Init: buildop,
|
||
|
|
Preprocess: preprocess,
|
||
|
|
Assemble: spanz,
|
||
|
|
Progedit: progedit,
|
||
|
|
UnaryDst: unaryDst,
|
||
|
|
DWARFRegisters: S390XDWARFRegisters,
|
||
|
|
}
|