mirror of
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c6e11fe037
Information about CPU architectures (e.g., name, family, byte ordering, pointer and register size) is currently redundantly scattered around the source tree. Instead consolidate the basic information into a single new package cmd/internal/sys. Also, introduce new sys.I386, sys.AMD64, etc. names for the constants '8', '6', etc. and replace most uses of the latter. The notable exceptions are a couple of error messages that still refer to the old char-based toolchain names and function reltype in cmd/link. Passes toolstash/buildall. Change-Id: I8a6f0cbd49577ec1672a98addebc45f767e36461 Reviewed-on: https://go-review.googlesource.com/21623 Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
950 lines
20 KiB
Go
950 lines
20 KiB
Go
// 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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"cmd/internal/obj"
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"cmd/internal/sys"
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"fmt"
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"log"
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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 stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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// MOV g_stackguard(g), R1
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p = obj.Appendp(ctxt, p)
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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(ctxt.Arch.PtrSize) // G.stackguard0
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if ctxt.Cursym.Cfunc {
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p.From.Offset = 3 * int64(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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q := (*obj.Prog)(nil)
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if framesize <= obj.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(ctxt, p)
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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(ctxt, p)
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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 <= obj.StackBig {
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// large stack: SP-framesize < stackguard-StackSmall
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// SUB $framesize, SP, R2
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// CMP stackguard, R2
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p = obj.Appendp(ctxt, p)
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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)
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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(ctxt, p)
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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(ctxt, p)
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p.As = ACMP
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = obj.StackPreempt
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p.Reg = REG_R1
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p = obj.Appendp(ctxt, p)
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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(ctxt, p)
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p.As = AADD
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = obj.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(ctxt, p)
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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(ctxt, p)
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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) + (obj.StackGuard - obj.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(ctxt, p)
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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(ctxt, p)
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bls.As = ABLS
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bls.To.Type = obj.TYPE_BRANCH
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var last *obj.Prog
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for last = ctxt.Cursym.Text; last.Link != nil; last = last.Link {
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}
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spfix := obj.Appendp(ctxt, last)
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spfix.As = obj.ANOP
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spfix.Spadj = -framesize
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// MOV LR, R3
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movlr := obj.Appendp(ctxt, spfix)
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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.Pcond = movlr
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}
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bls.Pcond = movlr
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debug := movlr
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if false {
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debug = obj.Appendp(ctxt, debug)
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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(ctxt, debug)
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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 ctxt.Cursym.Cfunc:
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morestack = "runtime.morestackc"
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case ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0:
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morestack = "runtime.morestack_noctxt"
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}
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call.To.Sym = obj.Linklookup(ctxt, morestack, 0)
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// B start
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jmp := obj.Appendp(ctxt, call)
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jmp.As = AB
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jmp.To.Type = obj.TYPE_BRANCH
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jmp.Pcond = ctxt.Cursym.Text.Link
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jmp.Spadj = +framesize
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// placeholder for bls's jump target
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// p = obj.Appendp(ctxt, p)
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// p.As = obj.ANOP
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return bls
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}
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func progedit(ctxt *obj.Link, p *obj.Prog) {
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p.From.Class = 0
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p.To.Class = 0
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// $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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f32 := float32(p.From.Val.(float64))
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i32 := math.Float32bits(f32)
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literal := fmt.Sprintf("$f32.%08x", uint32(i32))
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s := obj.Linklookup(ctxt, literal, 0)
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s.Size = 4
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = s
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p.From.Sym.Local = true
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p.From.Name = obj.NAME_EXTERN
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p.From.Offset = 0
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}
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case AFMOVD:
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if p.From.Type == obj.TYPE_FCONST {
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i64 := math.Float64bits(p.From.Val.(float64))
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literal := fmt.Sprintf("$f64.%016x", uint64(i64))
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s := obj.Linklookup(ctxt, literal, 0)
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s.Size = 8
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p.From.Type = obj.TYPE_MEM
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p.From.Sym = s
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p.From.Sym.Local = true
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p.From.Name = obj.NAME_EXTERN
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p.From.Offset = 0
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}
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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,
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AADDW,
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ASUB,
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ASUBW,
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ACMP,
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ACMPW,
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ACMN,
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ACMNW:
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if p.From.Type == obj.NAME_EXTERN && p.From.Offset < 0 {
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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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break
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}
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if ctxt.Flag_dynlink {
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rewriteToUseGot(ctxt, p)
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}
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}
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// Rewrite p, if necessary, to access global data via the global offset table.
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func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog) {
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if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO {
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// ADUFFxxx $offset
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// becomes
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// MOVD runtime.duffxxx@GOT, 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 = obj.Linklookup(ctxt, "runtime.duffzero", 0)
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} else {
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sym = obj.Linklookup(ctxt, "runtime.duffcopy", 0)
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}
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offset := p.To.Offset
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p.As = AMOVD
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p.From.Type = obj.TYPE_MEM
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p.From.Name = obj.NAME_GOTREF
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p.From.Sym = sym
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REGTMP
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p.To.Name = obj.NAME_NONE
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p.To.Offset = 0
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p.To.Sym = nil
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p1 := obj.Appendp(ctxt, p)
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p1.As = AADD
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p1.From.Type = obj.TYPE_CONST
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p1.From.Offset = offset
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p1.To.Type = obj.TYPE_REG
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p1.To.Reg = REGTMP
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p2 := obj.Appendp(ctxt, p1)
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p2.As = obj.ACALL
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p2.To.Type = obj.TYPE_REG
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p2.To.Reg = REGTMP
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}
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// We only care about global data: NAME_EXTERN means a global
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// symbol in the Go sense, and p.Sym.Local is true for a few
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// internally defined symbols.
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if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
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// MOVD $sym, Rx becomes MOVD sym@GOT, Rx
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// MOVD $sym+<off>, Rx becomes MOVD sym@GOT, Rx; ADD <off>, Rx
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if p.As != AMOVD {
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ctxt.Diag("do not know how to handle TYPE_ADDR in %v with -dynlink", p)
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}
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if p.To.Type != obj.TYPE_REG {
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ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v with -dynlink", p)
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}
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p.From.Type = obj.TYPE_MEM
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p.From.Name = obj.NAME_GOTREF
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if p.From.Offset != 0 {
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q := obj.Appendp(ctxt, p)
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q.As = AADD
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = p.From.Offset
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q.To = p.To
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p.From.Offset = 0
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}
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}
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if p.From3 != nil && p.From3.Name == obj.NAME_EXTERN {
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ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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var source *obj.Addr
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// MOVx sym, Ry becomes MOVD sym@GOT, REGTMP; MOVx (REGTMP), Ry
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// MOVx Ry, sym becomes MOVD sym@GOT, REGTMP; MOVD Ry, (REGTMP)
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// An addition may be inserted between the two MOVs if there is an offset.
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if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
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if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local {
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ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p)
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}
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source = &p.From
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} else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local {
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source = &p.To
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} else {
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return
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}
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if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP {
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return
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}
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if source.Sym.Type == obj.STLSBSS {
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return
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}
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if source.Type != obj.TYPE_MEM {
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ctxt.Diag("don't know how to handle %v with -dynlink", p)
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}
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p1 := obj.Appendp(ctxt, p)
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p2 := obj.Appendp(ctxt, p1)
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p1.As = AMOVD
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p1.From.Type = obj.TYPE_MEM
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p1.From.Sym = source.Sym
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p1.From.Name = obj.NAME_GOTREF
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p1.To.Type = obj.TYPE_REG
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p1.To.Reg = REGTMP
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p2.As = p.As
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p2.From = p.From
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p2.To = p.To
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if p.From.Name == obj.NAME_EXTERN {
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p2.From.Reg = REGTMP
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p2.From.Name = obj.NAME_NONE
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p2.From.Sym = nil
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} else if p.To.Name == obj.NAME_EXTERN {
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p2.To.Reg = REGTMP
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p2.To.Name = obj.NAME_NONE
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p2.To.Sym = nil
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} else {
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return
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}
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obj.Nopout(p)
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}
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func follow(ctxt *obj.Link, s *obj.LSym) {
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ctxt.Cursym = s
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firstp := ctxt.NewProg()
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lastp := firstp
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xfol(ctxt, s.Text, &lastp)
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lastp.Link = nil
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s.Text = firstp.Link
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}
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func relinv(a obj.As) obj.As {
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switch a {
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case ABEQ:
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return ABNE
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case ABNE:
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return ABEQ
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case ABCS:
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return ABCC
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case ABHS:
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return ABLO
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case ABCC:
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return ABCS
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case ABLO:
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return ABHS
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case ABMI:
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return ABPL
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case ABPL:
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return ABMI
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case ABVS:
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return ABVC
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case ABVC:
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return ABVS
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case ABHI:
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return ABLS
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case ABLS:
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return ABHI
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case ABGE:
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return ABLT
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case ABLT:
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return ABGE
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case ABGT:
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return ABLE
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case ABLE:
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return ABGT
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}
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log.Fatalf("unknown relation: %s", Anames[a])
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return 0
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}
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func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) {
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var q *obj.Prog
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var r *obj.Prog
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var i int
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loop:
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if p == nil {
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return
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}
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a := p.As
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if a == AB {
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q = p.Pcond
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if q != nil {
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p.Mark |= FOLL
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p = q
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if !(p.Mark&FOLL != 0) {
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goto loop
|
|
}
|
|
}
|
|
}
|
|
|
|
if p.Mark&FOLL != 0 {
|
|
i = 0
|
|
q = p
|
|
for ; i < 4; i, q = i+1, q.Link {
|
|
if q == *last || q == nil {
|
|
break
|
|
}
|
|
a = q.As
|
|
if a == obj.ANOP {
|
|
i--
|
|
continue
|
|
}
|
|
|
|
if a == AB || a == obj.ARET || a == AERET {
|
|
goto copy
|
|
}
|
|
if q.Pcond == nil || (q.Pcond.Mark&FOLL != 0) {
|
|
continue
|
|
}
|
|
if a != ABEQ && a != ABNE {
|
|
continue
|
|
}
|
|
|
|
copy:
|
|
for {
|
|
r = ctxt.NewProg()
|
|
*r = *p
|
|
if !(r.Mark&FOLL != 0) {
|
|
fmt.Printf("can't happen 1\n")
|
|
}
|
|
r.Mark |= FOLL
|
|
if p != q {
|
|
p = p.Link
|
|
(*last).Link = r
|
|
*last = r
|
|
continue
|
|
}
|
|
|
|
(*last).Link = r
|
|
*last = r
|
|
if a == AB || a == obj.ARET || a == AERET {
|
|
return
|
|
}
|
|
if a == ABNE {
|
|
r.As = ABEQ
|
|
} else {
|
|
r.As = ABNE
|
|
}
|
|
r.Pcond = p.Link
|
|
r.Link = p.Pcond
|
|
if !(r.Link.Mark&FOLL != 0) {
|
|
xfol(ctxt, r.Link, last)
|
|
}
|
|
if !(r.Pcond.Mark&FOLL != 0) {
|
|
fmt.Printf("can't happen 2\n")
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
a = AB
|
|
q = ctxt.NewProg()
|
|
q.As = a
|
|
q.Lineno = p.Lineno
|
|
q.To.Type = obj.TYPE_BRANCH
|
|
q.To.Offset = p.Pc
|
|
q.Pcond = p
|
|
p = q
|
|
}
|
|
|
|
p.Mark |= FOLL
|
|
(*last).Link = p
|
|
*last = p
|
|
if a == AB || a == obj.ARET || a == AERET {
|
|
return
|
|
}
|
|
if p.Pcond != nil {
|
|
if a != ABL && p.Link != nil {
|
|
q = obj.Brchain(ctxt, p.Link)
|
|
if a != obj.ATEXT {
|
|
if q != nil && (q.Mark&FOLL != 0) {
|
|
p.As = relinv(a)
|
|
p.Link = p.Pcond
|
|
p.Pcond = q
|
|
}
|
|
}
|
|
|
|
xfol(ctxt, p.Link, last)
|
|
q = obj.Brchain(ctxt, p.Pcond)
|
|
if q == nil {
|
|
q = p.Pcond
|
|
}
|
|
if q.Mark&FOLL != 0 {
|
|
p.Pcond = q
|
|
return
|
|
}
|
|
|
|
p = q
|
|
goto loop
|
|
}
|
|
}
|
|
|
|
p = p.Link
|
|
goto loop
|
|
}
|
|
|
|
func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
|
|
ctxt.Cursym = cursym
|
|
|
|
if cursym.Text == nil || cursym.Text.Link == nil {
|
|
return
|
|
}
|
|
|
|
p := cursym.Text
|
|
textstksiz := p.To.Offset
|
|
aoffset := int32(textstksiz)
|
|
|
|
cursym.Args = p.To.Val.(int32)
|
|
cursym.Locals = int32(textstksiz)
|
|
|
|
/*
|
|
* find leaf subroutines
|
|
* strip NOPs
|
|
* expand RET
|
|
*/
|
|
ctxt.Bso.Flush()
|
|
q := (*obj.Prog)(nil)
|
|
var q1 *obj.Prog
|
|
for p := cursym.Text; p != nil; p = p.Link {
|
|
switch p.As {
|
|
case obj.ATEXT:
|
|
p.Mark |= LEAF
|
|
|
|
case obj.ARET:
|
|
break
|
|
|
|
case obj.ANOP:
|
|
q1 = p.Link
|
|
q.Link = q1 /* q is non-nop */
|
|
q1.Mark |= p.Mark
|
|
continue
|
|
|
|
case ABL,
|
|
obj.ADUFFZERO,
|
|
obj.ADUFFCOPY:
|
|
cursym.Text.Mark &^= LEAF
|
|
fallthrough
|
|
|
|
case ACBNZ,
|
|
ACBZ,
|
|
ACBNZW,
|
|
ACBZW,
|
|
ATBZ,
|
|
ATBNZ,
|
|
AB,
|
|
ABEQ,
|
|
ABNE,
|
|
ABCS,
|
|
ABHS,
|
|
ABCC,
|
|
ABLO,
|
|
ABMI,
|
|
ABPL,
|
|
ABVS,
|
|
ABVC,
|
|
ABHI,
|
|
ABLS,
|
|
ABGE,
|
|
ABLT,
|
|
ABGT,
|
|
ABLE,
|
|
AADR, /* strange */
|
|
AADRP:
|
|
q1 = p.Pcond
|
|
|
|
if q1 != nil {
|
|
for q1.As == obj.ANOP {
|
|
q1 = q1.Link
|
|
p.Pcond = q1
|
|
}
|
|
}
|
|
|
|
break
|
|
}
|
|
|
|
q = p
|
|
}
|
|
|
|
var q2 *obj.Prog
|
|
var retjmp *obj.LSym
|
|
for p := cursym.Text; p != nil; p = p.Link {
|
|
o := p.As
|
|
switch o {
|
|
case obj.ATEXT:
|
|
cursym.Text = p
|
|
if textstksiz < 0 {
|
|
ctxt.Autosize = 0
|
|
} else {
|
|
ctxt.Autosize = int32(textstksiz + 8)
|
|
}
|
|
if (cursym.Text.Mark&LEAF != 0) && ctxt.Autosize <= 8 {
|
|
ctxt.Autosize = 0
|
|
} else if ctxt.Autosize&(16-1) != 0 {
|
|
// The frame includes an LR.
|
|
// If the frame size is 8, it's only an LR,
|
|
// so there's no potential for breaking references to
|
|
// local variables by growing the frame size,
|
|
// because there are no local variables.
|
|
// But otherwise, if there is a non-empty locals section,
|
|
// the author of the code is responsible for making sure
|
|
// that the frame size is 8 mod 16.
|
|
if ctxt.Autosize == 8 {
|
|
ctxt.Autosize += 8
|
|
cursym.Locals += 8
|
|
} else {
|
|
ctxt.Diag("%v: unaligned frame size %d - must be 8 mod 16 (or 0)", p, ctxt.Autosize-8)
|
|
}
|
|
}
|
|
p.To.Offset = int64(ctxt.Autosize) - 8
|
|
if ctxt.Autosize == 0 && !(cursym.Text.Mark&LEAF != 0) {
|
|
if ctxt.Debugvlog != 0 {
|
|
fmt.Fprintf(ctxt.Bso, "save suppressed in: %s\n", cursym.Text.From.Sym.Name)
|
|
}
|
|
ctxt.Bso.Flush()
|
|
cursym.Text.Mark |= LEAF
|
|
}
|
|
|
|
if !(p.From3.Offset&obj.NOSPLIT != 0) {
|
|
p = stacksplit(ctxt, p, ctxt.Autosize) // emit split check
|
|
}
|
|
|
|
aoffset = ctxt.Autosize
|
|
if aoffset > 0xF0 {
|
|
aoffset = 0xF0
|
|
}
|
|
if cursym.Text.Mark&LEAF != 0 {
|
|
cursym.Leaf = true
|
|
if ctxt.Autosize == 0 {
|
|
break
|
|
}
|
|
aoffset = 0
|
|
}
|
|
|
|
q = p
|
|
if ctxt.Autosize > aoffset {
|
|
q = ctxt.NewProg()
|
|
q.As = ASUB
|
|
q.Lineno = p.Lineno
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = int64(ctxt.Autosize) - int64(aoffset)
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REGSP
|
|
q.Spadj = int32(q.From.Offset)
|
|
q.Link = p.Link
|
|
p.Link = q
|
|
if cursym.Text.Mark&LEAF != 0 {
|
|
break
|
|
}
|
|
}
|
|
|
|
q1 = ctxt.NewProg()
|
|
q1.As = AMOVD
|
|
q1.Lineno = p.Lineno
|
|
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.Link = q.Link
|
|
q1.Spadj = aoffset
|
|
q.Link = q1
|
|
|
|
if cursym.Text.From3.Offset&obj.WRAPPER != 0 {
|
|
// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
|
|
//
|
|
// MOV g_panic(g), R1
|
|
// CMP ZR, R1
|
|
// BEQ end
|
|
// MOV panic_argp(R1), R2
|
|
// ADD $(autosize+8), RSP, R3
|
|
// CMP R2, R3
|
|
// BNE end
|
|
// ADD $8, RSP, R4
|
|
// MOVD R4, panic_argp(R1)
|
|
// end:
|
|
// NOP
|
|
//
|
|
// The NOP is needed to give the jumps somewhere to land.
|
|
// It is a liblink NOP, not a ARM64 NOP: it encodes to 0 instruction bytes.
|
|
q = q1
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.From.Type = obj.TYPE_MEM
|
|
q.From.Reg = REGG
|
|
q.From.Offset = 4 * int64(ctxt.Arch.PtrSize) // G.panic
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R1
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ACMP
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REGZERO
|
|
q.Reg = REG_R1
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ABEQ
|
|
q.To.Type = obj.TYPE_BRANCH
|
|
q1 = q
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AMOVD
|
|
q.From.Type = obj.TYPE_MEM
|
|
q.From.Reg = REG_R1
|
|
q.From.Offset = 0 // Panic.argp
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R2
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = AADD
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = int64(ctxt.Autosize) + 8
|
|
q.Reg = REGSP
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REG_R3
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ACMP
|
|
q.From.Type = obj.TYPE_REG
|
|
q.From.Reg = REG_R2
|
|
q.Reg = REG_R3
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
q.As = ABNE
|
|
q.To.Type = obj.TYPE_BRANCH
|
|
q2 = q
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
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
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
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
|
|
|
|
q = obj.Appendp(ctxt, q)
|
|
|
|
q.As = obj.ANOP
|
|
q1.Pcond = q
|
|
q2.Pcond = q
|
|
}
|
|
|
|
case obj.ARET:
|
|
nocache(p)
|
|
if p.From.Type == obj.TYPE_CONST {
|
|
ctxt.Diag("using BECOME (%v) is not supported!", p)
|
|
break
|
|
}
|
|
|
|
retjmp = p.To.Sym
|
|
p.To = obj.Addr{}
|
|
if cursym.Text.Mark&LEAF != 0 {
|
|
if ctxt.Autosize != 0 {
|
|
p.As = AADD
|
|
p.From.Type = obj.TYPE_CONST
|
|
p.From.Offset = int64(ctxt.Autosize)
|
|
p.To.Type = obj.TYPE_REG
|
|
p.To.Reg = REGSP
|
|
p.Spadj = -ctxt.Autosize
|
|
}
|
|
} else {
|
|
/* want write-back pre-indexed SP+autosize -> SP, loading REGLINK*/
|
|
aoffset = ctxt.Autosize
|
|
|
|
if aoffset > 0xF0 {
|
|
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
|
|
if ctxt.Autosize > aoffset {
|
|
q = ctxt.NewProg()
|
|
q.As = AADD
|
|
q.From.Type = obj.TYPE_CONST
|
|
q.From.Offset = int64(ctxt.Autosize) - int64(aoffset)
|
|
q.To.Type = obj.TYPE_REG
|
|
q.To.Reg = REGSP
|
|
q.Link = p.Link
|
|
q.Spadj = int32(-q.From.Offset)
|
|
q.Lineno = p.Lineno
|
|
p.Link = q
|
|
p = q
|
|
}
|
|
}
|
|
|
|
if p.As != obj.ARET {
|
|
q = ctxt.NewProg()
|
|
q.Lineno = p.Lineno
|
|
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 = +ctxt.Autosize
|
|
break
|
|
}
|
|
|
|
p.As = obj.ARET
|
|
p.To.Type = obj.TYPE_MEM
|
|
p.To.Offset = 0
|
|
p.To.Reg = REGLINK
|
|
p.Spadj = +ctxt.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)
|
|
}
|
|
}
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
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,
|
|
ASVC: true,
|
|
}
|
|
|
|
var Linkarm64 = obj.LinkArch{
|
|
Arch: sys.ArchARM64,
|
|
Preprocess: preprocess,
|
|
Assemble: span7,
|
|
Follow: follow,
|
|
Progedit: progedit,
|
|
UnaryDst: unaryDst,
|
|
}
|