You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
736 lines
19 KiB
Go
736 lines
19 KiB
Go
// Based on cmd/internal/obj/ppc64/obj9.go.
|
|
//
|
|
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
|
|
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
|
|
// Portions Copyright © 1997-1999 Vita Nuova Limited
|
|
// Portions Copyright © 2000-2008 Vita Nuova Holdings Limited (www.vitanuova.com)
|
|
// Portions Copyright © 2004,2006 Bruce Ellis
|
|
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
|
|
// Revisions Copyright © 2000-2008 Lucent Technologies Inc. and others
|
|
// Portions Copyright © 2009 The Go Authors. All rights reserved.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
package s390x
|
|
|
|
import (
|
|
"github.com/twitchyliquid64/golang-asm/obj"
|
|
"github.com/twitchyliquid64/golang-asm/objabi"
|
|
"github.com/twitchyliquid64/golang-asm/sys"
|
|
"math"
|
|
)
|
|
|
|
func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
|
|
p.From.Class = 0
|
|
p.To.Class = 0
|
|
|
|
c := ctxtz{ctxt: ctxt, newprog: newprog}
|
|
|
|
// Rewrite BR/BL to symbol as TYPE_BRANCH.
|
|
switch p.As {
|
|
case ABR, ABL, obj.ARET, obj.ADUFFZERO, obj.ADUFFCOPY:
|
|
if p.To.Sym != nil {
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
}
|
|
}
|
|
|
|
// Rewrite float constants to values stored in memory unless they are +0.
|
|
switch p.As {
|
|
case AFMOVS:
|
|
if p.From.Type == obj.TYPE_FCONST {
|
|
f32 := float32(p.From.Val.(float64))
|
|
if math.Float32bits(f32) == 0 { // +0
|
|
break
|
|
}
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Sym = ctxt.Float32Sym(f32)
|
|
p.From.Name = obj.NAME_EXTERN
|
|
p.From.Offset = 0
|
|
}
|
|
|
|
case AFMOVD:
|
|
if p.From.Type == obj.TYPE_FCONST {
|
|
f64 := p.From.Val.(float64)
|
|
if math.Float64bits(f64) == 0 { // +0
|
|
break
|
|
}
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Sym = ctxt.Float64Sym(f64)
|
|
p.From.Name = obj.NAME_EXTERN
|
|
p.From.Offset = 0
|
|
}
|
|
|
|
// put constants not loadable by LOAD IMMEDIATE into memory
|
|
case AMOVD:
|
|
if p.From.Type == obj.TYPE_CONST {
|
|
val := p.From.Offset
|
|
if int64(int32(val)) != val &&
|
|
int64(uint32(val)) != val &&
|
|
int64(uint64(val)&(0xffffffff<<32)) != val {
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Sym = ctxt.Int64Sym(p.From.Offset)
|
|
p.From.Name = obj.NAME_EXTERN
|
|
p.From.Offset = 0
|
|
}
|
|
}
|
|
}
|
|
|
|
// Rewrite SUB constants into ADD.
|
|
switch p.As {
|
|
case ASUBC:
|
|
if p.From.Type == obj.TYPE_CONST && isint32(-p.From.Offset) {
|
|
p.From.Offset = -p.From.Offset
|
|
p.As = AADDC
|
|
}
|
|
|
|
case ASUB:
|
|
if p.From.Type == obj.TYPE_CONST && isint32(-p.From.Offset) {
|
|
p.From.Offset = -p.From.Offset
|
|
p.As = AADD
|
|
}
|
|
}
|
|
|
|
if c.ctxt.Flag_dynlink {
|
|
c.rewriteToUseGot(p)
|
|
}
|
|
}
|
|
|
|
// Rewrite p, if necessary, to access global data via the global offset table.
|
|
func (c *ctxtz) rewriteToUseGot(p *obj.Prog) {
|
|
// At the moment EXRL instructions are not emitted by the compiler and only reference local symbols in
|
|
// assembly code.
|
|
if p.As == AEXRL {
|
|
return
|
|
}
|
|
|
|
// We only care about global data: NAME_EXTERN means a global
|
|
// symbol in the Go sense, and p.Sym.Local is true for a few
|
|
// internally defined symbols.
|
|
// Rewrites must not clobber flags and therefore cannot use the
|
|
// ADD instruction.
|
|
if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() {
|
|
// MOVD $sym, Rx becomes MOVD sym@GOT, Rx
|
|
// MOVD $sym+<off>, Rx becomes MOVD sym@GOT, Rx or REGTMP2; MOVD $<off>(Rx or REGTMP2), Rx
|
|
if p.To.Type != obj.TYPE_REG || p.As != AMOVD {
|
|
c.ctxt.Diag("do not know how to handle LEA-type insn to non-register in %v with -dynlink", p)
|
|
}
|
|
p.From.Type = obj.TYPE_MEM
|
|
p.From.Name = obj.NAME_GOTREF
|
|
q := p
|
|
if p.From.Offset != 0 {
|
|
target := p.To.Reg
|
|
if target == REG_R0 {
|
|
// Cannot use R0 as input to address calculation.
|
|
// REGTMP might be used by the assembler.
|
|
p.To.Reg = REGTMP2
|
|
}
|
|
q = obj.Appendp(q, c.newprog)
|
|
q.As = AMOVD
|
|
q.From.Type = obj.TYPE_ADDR
|
|
q.From.Offset = p.From.Offset
|
|
q.From.Reg = p.To.Reg
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = target
|
|
p.From.Offset = 0
|
|
}
|
|
}
|
|
if p.GetFrom3() != nil && p.GetFrom3().Name == obj.NAME_EXTERN {
|
|
c.ctxt.Diag("don't know how to handle %v with -dynlink", p)
|
|
}
|
|
var source *obj.Addr
|
|
// MOVD sym, Ry becomes MOVD sym@GOT, REGTMP2; MOVD (REGTMP2), Ry
|
|
// MOVD Ry, sym becomes MOVD sym@GOT, REGTMP2; MOVD Ry, (REGTMP2)
|
|
// An addition may be inserted between the two MOVs if there is an offset.
|
|
if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() {
|
|
if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() {
|
|
c.ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p)
|
|
}
|
|
source = &p.From
|
|
} else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() {
|
|
source = &p.To
|
|
} else {
|
|
return
|
|
}
|
|
if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP {
|
|
return
|
|
}
|
|
if source.Sym.Type == objabi.STLSBSS {
|
|
return
|
|
}
|
|
if source.Type != obj.TYPE_MEM {
|
|
c.ctxt.Diag("don't know how to handle %v with -dynlink", p)
|
|
}
|
|
p1 := obj.Appendp(p, c.newprog)
|
|
p2 := obj.Appendp(p1, c.newprog)
|
|
|
|
p1.As = AMOVD
|
|
p1.From.Type = obj.TYPE_MEM
|
|
p1.From.Sym = source.Sym
|
|
p1.From.Name = obj.NAME_GOTREF
|
|
p1.To.Type = obj.TYPE_REG
|
|
p1.To.Reg = REGTMP2
|
|
|
|
p2.As = p.As
|
|
p2.From = p.From
|
|
p2.To = p.To
|
|
if p.From.Name == obj.NAME_EXTERN {
|
|
p2.From.Reg = REGTMP2
|
|
p2.From.Name = obj.NAME_NONE
|
|
p2.From.Sym = nil
|
|
} else if p.To.Name == obj.NAME_EXTERN {
|
|
p2.To.Reg = REGTMP2
|
|
p2.To.Name = obj.NAME_NONE
|
|
p2.To.Sym = nil
|
|
} else {
|
|
return
|
|
}
|
|
obj.Nopout(p)
|
|
}
|
|
|
|
func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
|
|
// TODO(minux): add morestack short-cuts with small fixed frame-size.
|
|
if cursym.Func.Text == nil || cursym.Func.Text.Link == nil {
|
|
return
|
|
}
|
|
|
|
c := ctxtz{ctxt: ctxt, cursym: cursym, newprog: newprog}
|
|
|
|
p := c.cursym.Func.Text
|
|
textstksiz := p.To.Offset
|
|
if textstksiz == -8 {
|
|
// Compatibility hack.
|
|
p.From.Sym.Set(obj.AttrNoFrame, true)
|
|
textstksiz = 0
|
|
}
|
|
if textstksiz%8 != 0 {
|
|
c.ctxt.Diag("frame size %d not a multiple of 8", textstksiz)
|
|
}
|
|
if p.From.Sym.NoFrame() {
|
|
if textstksiz != 0 {
|
|
c.ctxt.Diag("NOFRAME functions must have a frame size of 0, not %d", textstksiz)
|
|
}
|
|
}
|
|
|
|
c.cursym.Func.Args = p.To.Val.(int32)
|
|
c.cursym.Func.Locals = int32(textstksiz)
|
|
|
|
/*
|
|
* find leaf subroutines
|
|
* strip NOPs
|
|
* expand RET
|
|
*/
|
|
|
|
var q *obj.Prog
|
|
for p := c.cursym.Func.Text; p != nil; p = p.Link {
|
|
switch p.As {
|
|
case obj.ATEXT:
|
|
q = p
|
|
p.Mark |= LEAF
|
|
|
|
case ABL, ABCL:
|
|
q = p
|
|
c.cursym.Func.Text.Mark &^= LEAF
|
|
fallthrough
|
|
|
|
case ABC,
|
|
ABRC,
|
|
ABEQ,
|
|
ABGE,
|
|
ABGT,
|
|
ABLE,
|
|
ABLT,
|
|
ABLEU,
|
|
ABLTU,
|
|
ABNE,
|
|
ABR,
|
|
ABVC,
|
|
ABVS,
|
|
ACRJ,
|
|
ACGRJ,
|
|
ACLRJ,
|
|
ACLGRJ,
|
|
ACIJ,
|
|
ACGIJ,
|
|
ACLIJ,
|
|
ACLGIJ,
|
|
ACMPBEQ,
|
|
ACMPBGE,
|
|
ACMPBGT,
|
|
ACMPBLE,
|
|
ACMPBLT,
|
|
ACMPBNE,
|
|
ACMPUBEQ,
|
|
ACMPUBGE,
|
|
ACMPUBGT,
|
|
ACMPUBLE,
|
|
ACMPUBLT,
|
|
ACMPUBNE:
|
|
q = p
|
|
p.Mark |= BRANCH
|
|
|
|
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,
|
|
}
|