999 lines
25 KiB
Go
999 lines
25 KiB
Go
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// cmd/7l/noop.c, cmd/7l/obj.c, cmd/ld/pass.c from Vita Nuova.
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// https://code.google.com/p/ken-cc/source/browse/
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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 © 2000-2007 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 © 2000-2007 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 arm64
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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/src"
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"github.com/twitchyliquid64/golang-asm/sys"
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"math"
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)
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var complements = []obj.As{
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AADD: ASUB,
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AADDW: ASUBW,
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ASUB: AADD,
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ASUBW: AADDW,
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ACMP: ACMN,
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ACMPW: ACMNW,
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ACMN: ACMP,
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ACMNW: ACMPW,
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}
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func (c *ctxt7) stacksplit(p *obj.Prog, framesize int32) *obj.Prog {
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// MOV g_stackguard(g), R1
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p = obj.Appendp(p, c.newprog)
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p.As = AMOVD
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p.From.Type = obj.TYPE_MEM
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p.From.Reg = REGG
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p.From.Offset = 2 * int64(c.ctxt.Arch.PtrSize) // G.stackguard0
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if c.cursym.CFunc() {
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p.From.Offset = 3 * int64(c.ctxt.Arch.PtrSize) // G.stackguard1
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}
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R1
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// Mark the stack bound check and morestack call async nonpreemptible.
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// If we get preempted here, when resumed the preemption request is
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// cleared, but we'll still call morestack, which will double the stack
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// unnecessarily. See issue #35470.
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p = c.ctxt.StartUnsafePoint(p, c.newprog)
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q := (*obj.Prog)(nil)
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if framesize <= objabi.StackSmall {
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// small stack: SP < stackguard
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// MOV SP, R2
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// CMP stackguard, R2
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p = obj.Appendp(p, c.newprog)
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p.As = AMOVD
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGSP
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R2
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p = obj.Appendp(p, c.newprog)
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p.As = ACMP
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REG_R1
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p.Reg = REG_R2
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} else if framesize <= objabi.StackBig {
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// large stack: SP-framesize < stackguard-StackSmall
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// SUB $(framesize-StackSmall), SP, R2
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// CMP stackguard, R2
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p = obj.Appendp(p, c.newprog)
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p.As = ASUB
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(framesize) - objabi.StackSmall
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p.Reg = REGSP
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R2
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p = obj.Appendp(p, c.newprog)
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p.As = ACMP
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REG_R1
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p.Reg = REG_R2
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} else {
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// Such a large stack we need to protect against wraparound
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// if SP is close to zero.
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// SP-stackguard+StackGuard < framesize + (StackGuard-StackSmall)
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// The +StackGuard on both sides is required to keep the left side positive:
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// SP is allowed to be slightly below stackguard. See stack.h.
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// CMP $StackPreempt, R1
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// BEQ label_of_call_to_morestack
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// ADD $StackGuard, SP, R2
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// SUB R1, R2
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// MOV $(framesize+(StackGuard-StackSmall)), R3
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// CMP R3, R2
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p = obj.Appendp(p, c.newprog)
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p.As = ACMP
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = objabi.StackPreempt
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p.Reg = REG_R1
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p = obj.Appendp(p, c.newprog)
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q = p
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p.As = ABEQ
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p.To.Type = obj.TYPE_BRANCH
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p = obj.Appendp(p, c.newprog)
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p.As = AADD
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(objabi.StackGuard)
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p.Reg = REGSP
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R2
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p = obj.Appendp(p, c.newprog)
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p.As = ASUB
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REG_R1
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R2
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p = obj.Appendp(p, c.newprog)
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p.As = AMOVD
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(framesize) + (int64(objabi.StackGuard) - objabi.StackSmall)
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R3
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p = obj.Appendp(p, c.newprog)
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p.As = ACMP
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REG_R3
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p.Reg = REG_R2
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}
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// BLS do-morestack
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bls := obj.Appendp(p, c.newprog)
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bls.As = ABLS
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bls.To.Type = obj.TYPE_BRANCH
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end := c.ctxt.EndUnsafePoint(bls, c.newprog, -1)
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var last *obj.Prog
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for last = c.cursym.Func.Text; last.Link != nil; last = last.Link {
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}
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// Now we are at the end of the function, but logically
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// we are still in function prologue. We need to fix the
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// SP data and PCDATA.
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spfix := obj.Appendp(last, c.newprog)
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spfix.As = obj.ANOP
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spfix.Spadj = -framesize
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pcdata := c.ctxt.EmitEntryStackMap(c.cursym, spfix, c.newprog)
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pcdata = c.ctxt.StartUnsafePoint(pcdata, c.newprog)
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// MOV LR, R3
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movlr := obj.Appendp(pcdata, c.newprog)
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movlr.As = AMOVD
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movlr.From.Type = obj.TYPE_REG
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movlr.From.Reg = REGLINK
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movlr.To.Type = obj.TYPE_REG
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movlr.To.Reg = REG_R3
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if q != nil {
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q.To.SetTarget(movlr)
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}
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bls.To.SetTarget(movlr)
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debug := movlr
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if false {
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debug = obj.Appendp(debug, c.newprog)
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debug.As = AMOVD
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debug.From.Type = obj.TYPE_CONST
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debug.From.Offset = int64(framesize)
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debug.To.Type = obj.TYPE_REG
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debug.To.Reg = REGTMP
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}
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// BL runtime.morestack(SB)
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call := obj.Appendp(debug, c.newprog)
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call.As = ABL
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call.To.Type = obj.TYPE_BRANCH
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morestack := "runtime.morestack"
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switch {
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case c.cursym.CFunc():
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morestack = "runtime.morestackc"
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case !c.cursym.Func.Text.From.Sym.NeedCtxt():
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morestack = "runtime.morestack_noctxt"
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}
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call.To.Sym = c.ctxt.Lookup(morestack)
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pcdata = c.ctxt.EndUnsafePoint(call, c.newprog, -1)
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// B start
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jmp := obj.Appendp(pcdata, c.newprog)
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jmp.As = AB
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jmp.To.Type = obj.TYPE_BRANCH
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jmp.To.SetTarget(c.cursym.Func.Text.Link)
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jmp.Spadj = +framesize
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return end
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}
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func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
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c := ctxt7{ctxt: ctxt, newprog: newprog}
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p.From.Class = 0
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p.To.Class = 0
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// $0 results in C_ZCON, which matches both C_REG and various
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// C_xCON, however the C_REG cases in asmout don't expect a
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// constant, so they will use the register fields and assemble
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// a R0. To prevent that, rewrite $0 as ZR.
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if p.From.Type == obj.TYPE_CONST && p.From.Offset == 0 {
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGZERO
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}
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if p.To.Type == obj.TYPE_CONST && p.To.Offset == 0 {
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REGZERO
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}
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// Rewrite BR/BL to symbol as TYPE_BRANCH.
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switch p.As {
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case AB,
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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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break
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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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f64 := p.From.Val.(float64)
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f32 := float32(f64)
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if c.chipfloat7(f64) > 0 {
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break
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}
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if math.Float32bits(f32) == 0 {
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGZERO
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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 = c.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 c.chipfloat7(f64) > 0 {
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break
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}
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if math.Float64bits(f64) == 0 {
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGZERO
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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 = c.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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break
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}
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// Rewrite negative immediates as positive immediates with
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// complementary instruction.
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switch p.As {
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case AADD, ASUB, ACMP, ACMN:
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if p.From.Type == obj.TYPE_CONST && p.From.Offset < 0 && p.From.Offset != -1<<63 {
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p.From.Offset = -p.From.Offset
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p.As = complements[p.As]
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}
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case AADDW, ASUBW, ACMPW, ACMNW:
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if p.From.Type == obj.TYPE_CONST && p.From.Offset < 0 && int32(p.From.Offset) != -1<<31 {
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p.From.Offset = -p.From.Offset
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p.As = complements[p.As]
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}
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}
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// For 32-bit logical instruction with constant,
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// rewrite the high 32-bit to be a repetition of
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// the low 32-bit, so that the BITCON test can be
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// shared for both 32-bit and 64-bit. 32-bit ops
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// will zero the high 32-bit of the destination
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// register anyway.
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if isANDWop(p.As) && p.From.Type == obj.TYPE_CONST {
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v := p.From.Offset & 0xffffffff
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p.From.Offset = v | v<<32
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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 *ctxt7) rewriteToUseGot(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, REGTMP
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// ADD $offset, REGTMP
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// CALL REGTMP
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var sym *obj.LSym
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if p.As == obj.ADUFFZERO {
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sym = c.ctxt.Lookup("runtime.duffzero")
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} else {
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sym = c.ctxt.Lookup("runtime.duffcopy")
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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 = REGTMP
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||
|
|
p.To.Name = obj.NAME_NONE
|
||
|
|
p.To.Offset = 0
|
||
|
|
p.To.Sym = nil
|
||
|
|
p1 := obj.Appendp(p, c.newprog)
|
||
|
|
p1.As = AADD
|
||
|
|
p1.From.Type = obj.TYPE_CONST
|
||
|
|
p1.From.Offset = offset
|
||
|
|
p1.To.Type = obj.TYPE_REG
|
||
|
|
p1.To.Reg = REGTMP
|
||
|
|
p2 := obj.Appendp(p1, c.newprog)
|
||
|
|
p2.As = obj.ACALL
|
||
|
|
p2.To.Type = obj.TYPE_REG
|
||
|
|
p2.To.Reg = REGTMP
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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.
|
||
|
|
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; ADD <off>, Rx
|
||
|
|
if p.As != AMOVD {
|
||
|
|
c.ctxt.Diag("do not know how to handle TYPE_ADDR in %v with -dynlink", p)
|
||
|
|
}
|
||
|
|
if p.To.Type != obj.TYPE_REG {
|
||
|
|
c.ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v with -dynlink", p)
|
||
|
|
}
|
||
|
|
p.From.Type = obj.TYPE_MEM
|
||
|
|
p.From.Name = obj.NAME_GOTREF
|
||
|
|
if p.From.Offset != 0 {
|
||
|
|
q := obj.Appendp(p, c.newprog)
|
||
|
|
q.As = AADD
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = p.From.Offset
|
||
|
|
q.To = p.To
|
||
|
|
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
|
||
|
|
// MOVx sym, Ry becomes MOVD sym@GOT, REGTMP; MOVx (REGTMP), Ry
|
||
|
|
// MOVx Ry, sym becomes MOVD sym@GOT, REGTMP; MOVD Ry, (REGTMP)
|
||
|
|
// 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 = REGTMP
|
||
|
|
|
||
|
|
p2.As = p.As
|
||
|
|
p2.From = p.From
|
||
|
|
p2.To = p.To
|
||
|
|
if p.From.Name == obj.NAME_EXTERN {
|
||
|
|
p2.From.Reg = REGTMP
|
||
|
|
p2.From.Name = obj.NAME_NONE
|
||
|
|
p2.From.Sym = nil
|
||
|
|
} else if p.To.Name == obj.NAME_EXTERN {
|
||
|
|
p2.To.Reg = REGTMP
|
||
|
|
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) {
|
||
|
|
if cursym.Func.Text == nil || cursym.Func.Text.Link == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
c := ctxt7{ctxt: ctxt, newprog: newprog, cursym: cursym}
|
||
|
|
|
||
|
|
p := c.cursym.Func.Text
|
||
|
|
textstksiz := p.To.Offset
|
||
|
|
if textstksiz == -8 {
|
||
|
|
// Historical way to mark NOFRAME.
|
||
|
|
p.From.Sym.Set(obj.AttrNoFrame, true)
|
||
|
|
textstksiz = 0
|
||
|
|
}
|
||
|
|
if textstksiz < 0 {
|
||
|
|
c.ctxt.Diag("negative frame size %d - did you mean NOFRAME?", 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
|
||
|
|
*/
|
||
|
|
for p := c.cursym.Func.Text; p != nil; p = p.Link {
|
||
|
|
switch p.As {
|
||
|
|
case obj.ATEXT:
|
||
|
|
p.Mark |= LEAF
|
||
|
|
|
||
|
|
case ABL,
|
||
|
|
obj.ADUFFZERO,
|
||
|
|
obj.ADUFFCOPY:
|
||
|
|
c.cursym.Func.Text.Mark &^= LEAF
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var q *obj.Prog
|
||
|
|
var q1 *obj.Prog
|
||
|
|
var retjmp *obj.LSym
|
||
|
|
for p := c.cursym.Func.Text; p != nil; p = p.Link {
|
||
|
|
o := p.As
|
||
|
|
switch o {
|
||
|
|
case obj.ATEXT:
|
||
|
|
c.cursym.Func.Text = p
|
||
|
|
c.autosize = int32(textstksiz)
|
||
|
|
|
||
|
|
if p.Mark&LEAF != 0 && c.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.
|
||
|
|
c.autosize += 8
|
||
|
|
}
|
||
|
|
|
||
|
|
if c.autosize != 0 {
|
||
|
|
extrasize := int32(0)
|
||
|
|
if c.autosize%16 == 8 {
|
||
|
|
// Allocate extra 8 bytes on the frame top to save FP
|
||
|
|
extrasize = 8
|
||
|
|
} else if c.autosize&(16-1) == 0 {
|
||
|
|
// Allocate extra 16 bytes to save FP for the old frame whose size is 8 mod 16
|
||
|
|
extrasize = 16
|
||
|
|
} else {
|
||
|
|
c.ctxt.Diag("%v: unaligned frame size %d - must be 16 aligned", p, c.autosize-8)
|
||
|
|
}
|
||
|
|
c.autosize += extrasize
|
||
|
|
c.cursym.Func.Locals += extrasize
|
||
|
|
|
||
|
|
// low 32 bits for autosize
|
||
|
|
// high 32 bits for extrasize
|
||
|
|
p.To.Offset = int64(c.autosize) | int64(extrasize)<<32
|
||
|
|
} else {
|
||
|
|
// NOFRAME
|
||
|
|
p.To.Offset = 0
|
||
|
|
}
|
||
|
|
|
||
|
|
if c.autosize == 0 && c.cursym.Func.Text.Mark&LEAF == 0 {
|
||
|
|
if c.ctxt.Debugvlog {
|
||
|
|
c.ctxt.Logf("save suppressed in: %s\n", c.cursym.Func.Text.From.Sym.Name)
|
||
|
|
}
|
||
|
|
c.cursym.Func.Text.Mark |= LEAF
|
||
|
|
}
|
||
|
|
|
||
|
|
if cursym.Func.Text.Mark&LEAF != 0 {
|
||
|
|
cursym.Set(obj.AttrLeaf, true)
|
||
|
|
if p.From.Sym.NoFrame() {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if !p.From.Sym.NoSplit() {
|
||
|
|
p = c.stacksplit(p, c.autosize) // emit split check
|
||
|
|
}
|
||
|
|
|
||
|
|
var prologueEnd *obj.Prog
|
||
|
|
|
||
|
|
aoffset := c.autosize
|
||
|
|
if aoffset > 0xF0 {
|
||
|
|
aoffset = 0xF0
|
||
|
|
}
|
||
|
|
|
||
|
|
// Frame is non-empty. Make sure to save link register, even if
|
||
|
|
// it is a leaf function, so that traceback works.
|
||
|
|
q = p
|
||
|
|
if c.autosize > aoffset {
|
||
|
|
// Frame size is too large for a MOVD.W 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.
|
||
|
|
// 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(q, c.newprog)
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.Pos = p.Pos
|
||
|
|
q.As = ASUB
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = int64(c.autosize)
|
||
|
|
q.Reg = REGSP
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REGTMP
|
||
|
|
|
||
|
|
prologueEnd = q
|
||
|
|
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.Pos = p.Pos
|
||
|
|
q.As = AMOVD
|
||
|
|
q.From.Type = obj.TYPE_REG
|
||
|
|
q.From.Reg = REGLINK
|
||
|
|
q.To.Type = obj.TYPE_MEM
|
||
|
|
q.To.Reg = REGTMP
|
||
|
|
|
||
|
|
q1 = obj.Appendp(q, c.newprog)
|
||
|
|
q1.Pos = p.Pos
|
||
|
|
q1.As = AMOVD
|
||
|
|
q1.From.Type = obj.TYPE_REG
|
||
|
|
q1.From.Reg = REGTMP
|
||
|
|
q1.To.Type = obj.TYPE_REG
|
||
|
|
q1.To.Reg = REGSP
|
||
|
|
q1.Spadj = c.autosize
|
||
|
|
|
||
|
|
if c.ctxt.Headtype == objabi.Hdarwin {
|
||
|
|
// iOS does not support SA_ONSTACK. We will run the signal handler
|
||
|
|
// on the G stack. If we write below SP, it may be clobbered by
|
||
|
|
// the signal handler. So we save LR after decrementing SP.
|
||
|
|
q1 = obj.Appendp(q1, c.newprog)
|
||
|
|
q1.Pos = p.Pos
|
||
|
|
q1.As = AMOVD
|
||
|
|
q1.From.Type = obj.TYPE_REG
|
||
|
|
q1.From.Reg = REGLINK
|
||
|
|
q1.To.Type = obj.TYPE_MEM
|
||
|
|
q1.To.Reg = REGSP
|
||
|
|
}
|
||
|
|
|
||
|
|
q1 = c.ctxt.EndUnsafePoint(q1, c.newprog, -1)
|
||
|
|
} else {
|
||
|
|
// small frame, update SP and save LR in a single MOVD.W instruction
|
||
|
|
q1 = obj.Appendp(q, c.newprog)
|
||
|
|
q1.As = AMOVD
|
||
|
|
q1.Pos = p.Pos
|
||
|
|
q1.From.Type = obj.TYPE_REG
|
||
|
|
q1.From.Reg = REGLINK
|
||
|
|
q1.To.Type = obj.TYPE_MEM
|
||
|
|
q1.Scond = C_XPRE
|
||
|
|
q1.To.Offset = int64(-aoffset)
|
||
|
|
q1.To.Reg = REGSP
|
||
|
|
q1.Spadj = aoffset
|
||
|
|
|
||
|
|
prologueEnd = q1
|
||
|
|
}
|
||
|
|
|
||
|
|
prologueEnd.Pos = prologueEnd.Pos.WithXlogue(src.PosPrologueEnd)
|
||
|
|
|
||
|
|
if objabi.Framepointer_enabled {
|
||
|
|
q1 = obj.Appendp(q1, c.newprog)
|
||
|
|
q1.Pos = p.Pos
|
||
|
|
q1.As = AMOVD
|
||
|
|
q1.From.Type = obj.TYPE_REG
|
||
|
|
q1.From.Reg = REGFP
|
||
|
|
q1.To.Type = obj.TYPE_MEM
|
||
|
|
q1.To.Reg = REGSP
|
||
|
|
q1.To.Offset = -8
|
||
|
|
|
||
|
|
q1 = obj.Appendp(q1, c.newprog)
|
||
|
|
q1.Pos = p.Pos
|
||
|
|
q1.As = ASUB
|
||
|
|
q1.From.Type = obj.TYPE_CONST
|
||
|
|
q1.From.Offset = 8
|
||
|
|
q1.Reg = REGSP
|
||
|
|
q1.To.Type = obj.TYPE_REG
|
||
|
|
q1.To.Reg = REGFP
|
||
|
|
}
|
||
|
|
|
||
|
|
if c.cursym.Func.Text.From.Sym.Wrapper() {
|
||
|
|
// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
|
||
|
|
//
|
||
|
|
// MOV g_panic(g), R1
|
||
|
|
// CBNZ checkargp
|
||
|
|
// end:
|
||
|
|
// NOP
|
||
|
|
// ... function body ...
|
||
|
|
// checkargp:
|
||
|
|
// MOV panic_argp(R1), R2
|
||
|
|
// ADD $(autosize+8), RSP, R3
|
||
|
|
// CMP R2, R3
|
||
|
|
// BNE end
|
||
|
|
// ADD $8, RSP, R4
|
||
|
|
// MOVD R4, panic_argp(R1)
|
||
|
|
// B end
|
||
|
|
//
|
||
|
|
// The NOP is needed to give the jumps somewhere to land.
|
||
|
|
// It is a liblink NOP, not an ARM64 NOP: it encodes to 0 instruction bytes.
|
||
|
|
q = q1
|
||
|
|
|
||
|
|
// MOV g_panic(g), R1
|
||
|
|
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_R1
|
||
|
|
|
||
|
|
// CBNZ R1, checkargp
|
||
|
|
cbnz := obj.Appendp(q, c.newprog)
|
||
|
|
cbnz.As = ACBNZ
|
||
|
|
cbnz.From.Type = obj.TYPE_REG
|
||
|
|
cbnz.From.Reg = REG_R1
|
||
|
|
cbnz.To.Type = obj.TYPE_BRANCH
|
||
|
|
|
||
|
|
// Empty branch target at the top of the function body
|
||
|
|
end := obj.Appendp(cbnz, c.newprog)
|
||
|
|
end.As = obj.ANOP
|
||
|
|
|
||
|
|
// find the end of the function
|
||
|
|
var last *obj.Prog
|
||
|
|
for last = end; last.Link != nil; last = last.Link {
|
||
|
|
}
|
||
|
|
|
||
|
|
// MOV panic_argp(R1), R2
|
||
|
|
mov := obj.Appendp(last, c.newprog)
|
||
|
|
mov.As = AMOVD
|
||
|
|
mov.From.Type = obj.TYPE_MEM
|
||
|
|
mov.From.Reg = REG_R1
|
||
|
|
mov.From.Offset = 0 // Panic.argp
|
||
|
|
mov.To.Type = obj.TYPE_REG
|
||
|
|
mov.To.Reg = REG_R2
|
||
|
|
|
||
|
|
// CBNZ branches to the MOV above
|
||
|
|
cbnz.To.SetTarget(mov)
|
||
|
|
|
||
|
|
// ADD $(autosize+8), SP, R3
|
||
|
|
q = obj.Appendp(mov, c.newprog)
|
||
|
|
q.As = AADD
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = int64(c.autosize) + 8
|
||
|
|
q.Reg = REGSP
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_R3
|
||
|
|
|
||
|
|
// CMP R2, R3
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = ACMP
|
||
|
|
q.From.Type = obj.TYPE_REG
|
||
|
|
q.From.Reg = REG_R2
|
||
|
|
q.Reg = REG_R3
|
||
|
|
|
||
|
|
// BNE end
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = ABNE
|
||
|
|
q.To.Type = obj.TYPE_BRANCH
|
||
|
|
q.To.SetTarget(end)
|
||
|
|
|
||
|
|
// ADD $8, SP, R4
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AADD
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = 8
|
||
|
|
q.Reg = REGSP
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REG_R4
|
||
|
|
|
||
|
|
// MOV R4, panic_argp(R1)
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AMOVD
|
||
|
|
q.From.Type = obj.TYPE_REG
|
||
|
|
q.From.Reg = REG_R4
|
||
|
|
q.To.Type = obj.TYPE_MEM
|
||
|
|
q.To.Reg = REG_R1
|
||
|
|
q.To.Offset = 0 // Panic.argp
|
||
|
|
|
||
|
|
// B end
|
||
|
|
q = obj.Appendp(q, c.newprog)
|
||
|
|
q.As = AB
|
||
|
|
q.To.Type = obj.TYPE_BRANCH
|
||
|
|
q.To.SetTarget(end)
|
||
|
|
}
|
||
|
|
|
||
|
|
case obj.ARET:
|
||
|
|
nocache(p)
|
||
|
|
if p.From.Type == obj.TYPE_CONST {
|
||
|
|
c.ctxt.Diag("using BECOME (%v) is not supported!", p)
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
retjmp = p.To.Sym
|
||
|
|
p.To = obj.Addr{}
|
||
|
|
if c.cursym.Func.Text.Mark&LEAF != 0 {
|
||
|
|
if c.autosize != 0 {
|
||
|
|
p.As = AADD
|
||
|
|
p.From.Type = obj.TYPE_CONST
|
||
|
|
p.From.Offset = int64(c.autosize)
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REGSP
|
||
|
|
p.Spadj = -c.autosize
|
||
|
|
|
||
|
|
if objabi.Framepointer_enabled {
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
p.As = ASUB
|
||
|
|
p.From.Type = obj.TYPE_CONST
|
||
|
|
p.From.Offset = 8
|
||
|
|
p.Reg = REGSP
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REGFP
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
/* want write-back pre-indexed SP+autosize -> SP, loading REGLINK*/
|
||
|
|
|
||
|
|
if objabi.Framepointer_enabled {
|
||
|
|
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 = REGFP
|
||
|
|
p = obj.Appendp(p, c.newprog)
|
||
|
|
}
|
||
|
|
|
||
|
|
aoffset := c.autosize
|
||
|
|
|
||
|
|
if aoffset <= 0xF0 {
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_MEM
|
||
|
|
p.Scond = C_XPOST
|
||
|
|
p.From.Offset = int64(aoffset)
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
p.To.Type = obj.TYPE_REG
|
||
|
|
p.To.Reg = REGLINK
|
||
|
|
p.Spadj = -aoffset
|
||
|
|
} else {
|
||
|
|
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 = REGLINK
|
||
|
|
|
||
|
|
q = newprog()
|
||
|
|
q.As = AADD
|
||
|
|
q.From.Type = obj.TYPE_CONST
|
||
|
|
q.From.Offset = int64(aoffset)
|
||
|
|
q.To.Type = obj.TYPE_REG
|
||
|
|
q.To.Reg = REGSP
|
||
|
|
q.Link = p.Link
|
||
|
|
q.Spadj = int32(-q.From.Offset)
|
||
|
|
q.Pos = p.Pos
|
||
|
|
p.Link = q
|
||
|
|
p = q
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if p.As != obj.ARET {
|
||
|
|
q = newprog()
|
||
|
|
q.Pos = p.Pos
|
||
|
|
q.Link = p.Link
|
||
|
|
p.Link = q
|
||
|
|
p = q
|
||
|
|
}
|
||
|
|
|
||
|
|
if retjmp != nil { // retjmp
|
||
|
|
p.As = AB
|
||
|
|
p.To.Type = obj.TYPE_BRANCH
|
||
|
|
p.To.Sym = retjmp
|
||
|
|
p.Spadj = +c.autosize
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
p.As = obj.ARET
|
||
|
|
p.To.Type = obj.TYPE_MEM
|
||
|
|
p.To.Offset = 0
|
||
|
|
p.To.Reg = REGLINK
|
||
|
|
p.Spadj = +c.autosize
|
||
|
|
|
||
|
|
case AADD, ASUB:
|
||
|
|
if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.From.Type == obj.TYPE_CONST {
|
||
|
|
if p.As == AADD {
|
||
|
|
p.Spadj = int32(-p.From.Offset)
|
||
|
|
} else {
|
||
|
|
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 = REGLINK
|
||
|
|
} else {
|
||
|
|
/* MOVD (RSP), Rd */
|
||
|
|
p.As = AMOVD
|
||
|
|
p.From.Type = obj.TYPE_MEM
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
}
|
||
|
|
|
||
|
|
case obj.ADUFFCOPY:
|
||
|
|
if objabi.Framepointer_enabled {
|
||
|
|
// ADR ret_addr, R27
|
||
|
|
// STP (FP, R27), -24(SP)
|
||
|
|
// SUB 24, SP, FP
|
||
|
|
// DUFFCOPY
|
||
|
|
// ret_addr:
|
||
|
|
// SUB 8, SP, FP
|
||
|
|
|
||
|
|
q1 := p
|
||
|
|
// copy DUFFCOPY from q1 to q4
|
||
|
|
q4 := obj.Appendp(p, c.newprog)
|
||
|
|
q4.Pos = p.Pos
|
||
|
|
q4.As = obj.ADUFFCOPY
|
||
|
|
q4.To = p.To
|
||
|
|
|
||
|
|
q1.As = AADR
|
||
|
|
q1.From.Type = obj.TYPE_BRANCH
|
||
|
|
q1.To.Type = obj.TYPE_REG
|
||
|
|
q1.To.Reg = REG_R27
|
||
|
|
|
||
|
|
q2 := obj.Appendp(q1, c.newprog)
|
||
|
|
q2.Pos = p.Pos
|
||
|
|
q2.As = ASTP
|
||
|
|
q2.From.Type = obj.TYPE_REGREG
|
||
|
|
q2.From.Reg = REGFP
|
||
|
|
q2.From.Offset = int64(REG_R27)
|
||
|
|
q2.To.Type = obj.TYPE_MEM
|
||
|
|
q2.To.Reg = REGSP
|
||
|
|
q2.To.Offset = -24
|
||
|
|
|
||
|
|
// maintaine FP for DUFFCOPY
|
||
|
|
q3 := obj.Appendp(q2, c.newprog)
|
||
|
|
q3.Pos = p.Pos
|
||
|
|
q3.As = ASUB
|
||
|
|
q3.From.Type = obj.TYPE_CONST
|
||
|
|
q3.From.Offset = 24
|
||
|
|
q3.Reg = REGSP
|
||
|
|
q3.To.Type = obj.TYPE_REG
|
||
|
|
q3.To.Reg = REGFP
|
||
|
|
|
||
|
|
q5 := obj.Appendp(q4, c.newprog)
|
||
|
|
q5.Pos = p.Pos
|
||
|
|
q5.As = ASUB
|
||
|
|
q5.From.Type = obj.TYPE_CONST
|
||
|
|
q5.From.Offset = 8
|
||
|
|
q5.Reg = REGSP
|
||
|
|
q5.To.Type = obj.TYPE_REG
|
||
|
|
q5.To.Reg = REGFP
|
||
|
|
q1.From.SetTarget(q5)
|
||
|
|
p = q5
|
||
|
|
}
|
||
|
|
|
||
|
|
case obj.ADUFFZERO:
|
||
|
|
if objabi.Framepointer_enabled {
|
||
|
|
// ADR ret_addr, R27
|
||
|
|
// STP (FP, R27), -24(SP)
|
||
|
|
// SUB 24, SP, FP
|
||
|
|
// DUFFZERO
|
||
|
|
// ret_addr:
|
||
|
|
// SUB 8, SP, FP
|
||
|
|
|
||
|
|
q1 := p
|
||
|
|
// copy DUFFZERO from q1 to q4
|
||
|
|
q4 := obj.Appendp(p, c.newprog)
|
||
|
|
q4.Pos = p.Pos
|
||
|
|
q4.As = obj.ADUFFZERO
|
||
|
|
q4.To = p.To
|
||
|
|
|
||
|
|
q1.As = AADR
|
||
|
|
q1.From.Type = obj.TYPE_BRANCH
|
||
|
|
q1.To.Type = obj.TYPE_REG
|
||
|
|
q1.To.Reg = REG_R27
|
||
|
|
|
||
|
|
q2 := obj.Appendp(q1, c.newprog)
|
||
|
|
q2.Pos = p.Pos
|
||
|
|
q2.As = ASTP
|
||
|
|
q2.From.Type = obj.TYPE_REGREG
|
||
|
|
q2.From.Reg = REGFP
|
||
|
|
q2.From.Offset = int64(REG_R27)
|
||
|
|
q2.To.Type = obj.TYPE_MEM
|
||
|
|
q2.To.Reg = REGSP
|
||
|
|
q2.To.Offset = -24
|
||
|
|
|
||
|
|
// maintaine FP for DUFFZERO
|
||
|
|
q3 := obj.Appendp(q2, c.newprog)
|
||
|
|
q3.Pos = p.Pos
|
||
|
|
q3.As = ASUB
|
||
|
|
q3.From.Type = obj.TYPE_CONST
|
||
|
|
q3.From.Offset = 24
|
||
|
|
q3.Reg = REGSP
|
||
|
|
q3.To.Type = obj.TYPE_REG
|
||
|
|
q3.To.Reg = REGFP
|
||
|
|
|
||
|
|
q5 := obj.Appendp(q4, c.newprog)
|
||
|
|
q5.Pos = p.Pos
|
||
|
|
q5.As = ASUB
|
||
|
|
q5.From.Type = obj.TYPE_CONST
|
||
|
|
q5.From.Offset = 8
|
||
|
|
q5.Reg = REGSP
|
||
|
|
q5.To.Type = obj.TYPE_REG
|
||
|
|
q5.To.Reg = REGFP
|
||
|
|
q1.From.SetTarget(q5)
|
||
|
|
p = q5
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func nocache(p *obj.Prog) {
|
||
|
|
p.Optab = 0
|
||
|
|
p.From.Class = 0
|
||
|
|
p.To.Class = 0
|
||
|
|
}
|
||
|
|
|
||
|
|
var unaryDst = map[obj.As]bool{
|
||
|
|
AWORD: true,
|
||
|
|
ADWORD: true,
|
||
|
|
ABL: true,
|
||
|
|
AB: true,
|
||
|
|
ACLREX: true,
|
||
|
|
}
|
||
|
|
|
||
|
|
var Linkarm64 = obj.LinkArch{
|
||
|
|
Arch: sys.ArchARM64,
|
||
|
|
Init: buildop,
|
||
|
|
Preprocess: preprocess,
|
||
|
|
Assemble: span7,
|
||
|
|
Progedit: progedit,
|
||
|
|
UnaryDst: unaryDst,
|
||
|
|
DWARFRegisters: ARM64DWARFRegisters,
|
||
|
|
}
|