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1176 lines
23 KiB
Go
1176 lines
23 KiB
Go
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// Derived from Inferno utils/5c/swt.c
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// http://code.google.com/p/inferno-os/source/browse/utils/5c/swt.c
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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 arm
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import (
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"cmd/internal/obj"
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"encoding/binary"
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"fmt"
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"log"
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"math"
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)
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var zprg5 = obj.Prog{
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As: AGOK,
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Scond: C_SCOND_NONE,
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Reg: NREG,
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From: obj.Addr{
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Name: D_NONE,
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Type_: D_NONE,
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Reg: NREG,
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},
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To: obj.Addr{
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Name: D_NONE,
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Type_: D_NONE,
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Reg: NREG,
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},
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}
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func symtype(a *obj.Addr) int {
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return int(a.Name)
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}
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func isdata(p *obj.Prog) bool {
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return p.As == ADATA || p.As == AGLOBL
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}
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func iscall(p *obj.Prog) bool {
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return p.As == ABL
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}
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func datasize(p *obj.Prog) int {
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return int(p.Reg)
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}
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func textflag(p *obj.Prog) int {
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return int(p.Reg)
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}
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func settextflag(p *obj.Prog, f int) {
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p.Reg = uint8(f)
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}
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func progedit(ctxt *obj.Link, p *obj.Prog) {
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var literal string
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var s *obj.LSym
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var tlsfallback *obj.LSym
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p.From.Class = 0
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p.To.Class = 0
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// Rewrite B/BL to symbol as D_BRANCH.
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switch p.As {
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case AB,
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ABL,
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ADUFFZERO,
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ADUFFCOPY:
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if p.To.Type_ == D_OREG && (p.To.Name == D_EXTERN || p.To.Name == D_STATIC) && p.To.Sym != nil {
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p.To.Type_ = D_BRANCH
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}
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break
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}
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// Replace TLS register fetches on older ARM procesors.
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switch p.As {
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// Treat MRC 15, 0, <reg>, C13, C0, 3 specially.
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case AMRC:
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if p.To.Offset&0xffff0fff == 0xee1d0f70 {
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// Because the instruction might be rewriten to a BL which returns in R0
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// the register must be zero.
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if p.To.Offset&0xf000 != 0 {
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ctxt.Diag("%v: TLS MRC instruction must write to R0 as it might get translated into a BL instruction", p.Line())
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}
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if ctxt.Goarm < 7 {
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// Replace it with BL runtime.read_tls_fallback(SB) for ARM CPUs that lack the tls extension.
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if tlsfallback == nil {
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tlsfallback = obj.Linklookup(ctxt, "runtime.read_tls_fallback", 0)
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}
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// MOVW LR, R11
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p.As = AMOVW
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p.From.Type_ = D_REG
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p.From.Reg = REGLINK
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p.To.Type_ = D_REG
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p.To.Reg = REGTMP
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// BL runtime.read_tls_fallback(SB)
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p = obj.Appendp(ctxt, p)
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p.As = ABL
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p.To.Type_ = D_BRANCH
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p.To.Sym = tlsfallback
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p.To.Offset = 0
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// MOVW R11, LR
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p = obj.Appendp(ctxt, p)
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p.As = AMOVW
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p.From.Type_ = D_REG
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p.From.Reg = REGTMP
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p.To.Type_ = D_REG
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p.To.Reg = REGLINK
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break
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}
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}
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// Otherwise, MRC/MCR instructions need no further treatment.
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p.As = AWORD
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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 AMOVF:
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if p.From.Type_ == D_FCONST && chipfloat5(ctxt, p.From.U.Dval) < 0 && (chipzero5(ctxt, p.From.U.Dval) < 0 || p.Scond&C_SCOND != C_SCOND_NONE) {
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var i32 uint32
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var f32 float32
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f32 = float32(p.From.U.Dval)
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i32 = math.Float32bits(f32)
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literal = fmt.Sprintf("$f32.%08x", i32)
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s = obj.Linklookup(ctxt, literal, 0)
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if s.Type_ == 0 {
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s.Type_ = obj.SRODATA
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obj.Adduint32(ctxt, s, i32)
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s.Reachable = 0
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}
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p.From.Type_ = D_OREG
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p.From.Sym = s
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p.From.Name = D_EXTERN
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p.From.Offset = 0
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}
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case AMOVD:
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if p.From.Type_ == D_FCONST && chipfloat5(ctxt, p.From.U.Dval) < 0 && (chipzero5(ctxt, p.From.U.Dval) < 0 || p.Scond&C_SCOND != C_SCOND_NONE) {
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var i64 uint64
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i64 = math.Float64bits(p.From.U.Dval)
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literal = fmt.Sprintf("$f64.%016x", i64)
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s = obj.Linklookup(ctxt, literal, 0)
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if s.Type_ == 0 {
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s.Type_ = obj.SRODATA
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obj.Adduint64(ctxt, s, i64)
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s.Reachable = 0
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}
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p.From.Type_ = D_OREG
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p.From.Sym = s
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p.From.Name = D_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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if ctxt.Flag_shared != 0 {
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// Shared libraries use R_ARM_TLS_IE32 instead of
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// R_ARM_TLS_LE32, replacing the link time constant TLS offset in
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// runtime.tlsg with an address to a GOT entry containing the
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// offset. Rewrite $runtime.tlsg(SB) to runtime.tlsg(SB) to
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// compensate.
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if ctxt.Tlsg == nil {
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ctxt.Tlsg = obj.Linklookup(ctxt, "runtime.tlsg", 0)
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}
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if p.From.Type_ == D_CONST && p.From.Name == D_EXTERN && p.From.Sym == ctxt.Tlsg {
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p.From.Type_ = D_OREG
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}
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if p.To.Type_ == D_CONST && p.To.Name == D_EXTERN && p.To.Sym == ctxt.Tlsg {
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p.To.Type_ = D_OREG
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}
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}
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}
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func prg() *obj.Prog {
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var p *obj.Prog
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p = new(obj.Prog)
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*p = zprg5
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return p
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}
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// Prog.mark
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const (
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FOLL = 1 << 0
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LABEL = 1 << 1
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LEAF = 1 << 2
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)
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func linkcase(casep *obj.Prog) {
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var p *obj.Prog
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for p = casep; p != nil; p = p.Link {
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if p.As == ABCASE {
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for ; p != nil && p.As == ABCASE; p = p.Link {
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p.Pcrel = casep
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}
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break
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}
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}
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}
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func nocache5(p *obj.Prog) {
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p.Optab = 0
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p.From.Class = 0
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p.To.Class = 0
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}
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func addstacksplit(ctxt *obj.Link, cursym *obj.LSym) {
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var p *obj.Prog
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var pl *obj.Prog
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var p1 *obj.Prog
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var p2 *obj.Prog
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var q *obj.Prog
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var q1 *obj.Prog
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var q2 *obj.Prog
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var o int
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var autosize int32
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var autoffset int32
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autosize = 0
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if ctxt.Symmorestack[0] == nil {
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ctxt.Symmorestack[0] = obj.Linklookup(ctxt, "runtime.morestack", 0)
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ctxt.Symmorestack[1] = obj.Linklookup(ctxt, "runtime.morestack_noctxt", 0)
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}
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q = nil
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ctxt.Cursym = cursym
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if cursym.Text == nil || cursym.Text.Link == nil {
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return
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|
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}
|
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|
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|
||
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softfloat(ctxt, cursym)
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p = cursym.Text
|
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autoffset = int32(p.To.Offset)
|
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|
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if autoffset < 0 {
|
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|
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autoffset = 0
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|
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}
|
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|
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cursym.Locals = autoffset
|
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|
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cursym.Args = p.To.Offset2
|
||
|
|
|
||
|
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if ctxt.Debugzerostack != 0 {
|
||
|
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if autoffset != 0 && !(p.Reg&obj.NOSPLIT != 0) {
|
||
|
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// MOVW $4(R13), R1
|
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|
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p = obj.Appendp(ctxt, p)
|
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|
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p.As = AMOVW
|
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|
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p.From.Type_ = D_CONST
|
||
|
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p.From.Reg = 13
|
||
|
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p.From.Offset = 4
|
||
|
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p.To.Type_ = D_REG
|
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|
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p.To.Reg = 1
|
||
|
|
|
||
|
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// MOVW $n(R13), R2
|
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|
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p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
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p.As = AMOVW
|
||
|
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p.From.Type_ = D_CONST
|
||
|
|
p.From.Reg = 13
|
||
|
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p.From.Offset = 4 + int64(autoffset)
|
||
|
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p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 2
|
||
|
|
|
||
|
|
// MOVW $0, R3
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Offset = 0
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 3
|
||
|
|
|
||
|
|
// L:
|
||
|
|
// MOVW.nil R3, 0(R1) +4
|
||
|
|
// CMP R1, R2
|
||
|
|
// BNE L
|
||
|
|
pl = obj.Appendp(ctxt, p)
|
||
|
|
p = pl
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 3
|
||
|
|
p.To.Type_ = D_OREG
|
||
|
|
p.To.Reg = 1
|
||
|
|
p.To.Offset = 4
|
||
|
|
p.Scond |= C_PBIT
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 1
|
||
|
|
p.Reg = 2
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ABNE
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
p.Pcond = pl
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* find leaf subroutines
|
||
|
|
* strip NOPs
|
||
|
|
* expand RET
|
||
|
|
* expand BECOME pseudo
|
||
|
|
*/
|
||
|
|
for p = cursym.Text; p != nil; p = p.Link {
|
||
|
|
|
||
|
|
switch p.As {
|
||
|
|
case ACASE:
|
||
|
|
if ctxt.Flag_shared != 0 {
|
||
|
|
linkcase(p)
|
||
|
|
}
|
||
|
|
|
||
|
|
case ATEXT:
|
||
|
|
p.Mark |= LEAF
|
||
|
|
|
||
|
|
case ARET:
|
||
|
|
break
|
||
|
|
|
||
|
|
case ADIV,
|
||
|
|
ADIVU,
|
||
|
|
AMOD,
|
||
|
|
AMODU:
|
||
|
|
q = p
|
||
|
|
if ctxt.Sym_div == nil {
|
||
|
|
initdiv(ctxt)
|
||
|
|
}
|
||
|
|
cursym.Text.Mark &^= LEAF
|
||
|
|
continue
|
||
|
|
|
||
|
|
case ANOP:
|
||
|
|
q1 = p.Link
|
||
|
|
q.Link = q1 /* q is non-nop */
|
||
|
|
if q1 != nil {
|
||
|
|
q1.Mark |= p.Mark
|
||
|
|
}
|
||
|
|
continue
|
||
|
|
|
||
|
|
case ABL,
|
||
|
|
ABX,
|
||
|
|
ADUFFZERO,
|
||
|
|
ADUFFCOPY:
|
||
|
|
cursym.Text.Mark &^= LEAF
|
||
|
|
fallthrough
|
||
|
|
|
||
|
|
case ABCASE,
|
||
|
|
AB,
|
||
|
|
ABEQ,
|
||
|
|
ABNE,
|
||
|
|
ABCS,
|
||
|
|
ABHS,
|
||
|
|
ABCC,
|
||
|
|
ABLO,
|
||
|
|
ABMI,
|
||
|
|
ABPL,
|
||
|
|
ABVS,
|
||
|
|
ABVC,
|
||
|
|
ABHI,
|
||
|
|
ABLS,
|
||
|
|
ABGE,
|
||
|
|
ABLT,
|
||
|
|
ABGT,
|
||
|
|
ABLE:
|
||
|
|
q1 = p.Pcond
|
||
|
|
if q1 != nil {
|
||
|
|
for q1.As == ANOP {
|
||
|
|
q1 = q1.Link
|
||
|
|
p.Pcond = q1
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
q = p
|
||
|
|
}
|
||
|
|
|
||
|
|
for p = cursym.Text; p != nil; p = p.Link {
|
||
|
|
o = int(p.As)
|
||
|
|
switch o {
|
||
|
|
case ATEXT:
|
||
|
|
autosize = int32(p.To.Offset + 4)
|
||
|
|
if autosize <= 4 {
|
||
|
|
if cursym.Text.Mark&LEAF != 0 {
|
||
|
|
p.To.Offset = -4
|
||
|
|
autosize = 0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if !(autosize != 0) && !(cursym.Text.Mark&LEAF != 0) {
|
||
|
|
if ctxt.Debugvlog != 0 {
|
||
|
|
fmt.Fprintf(ctxt.Bso, "save suppressed in: %s\n", cursym.Name)
|
||
|
|
obj.Bflush(ctxt.Bso)
|
||
|
|
}
|
||
|
|
|
||
|
|
cursym.Text.Mark |= LEAF
|
||
|
|
}
|
||
|
|
|
||
|
|
if cursym.Text.Mark&LEAF != 0 {
|
||
|
|
cursym.Leaf = 1
|
||
|
|
if !(autosize != 0) {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if !(p.Reg&obj.NOSPLIT != 0) {
|
||
|
|
p = stacksplit(ctxt, p, autosize, bool2int(!(cursym.Text.Reg&obj.NEEDCTXT != 0))) // emit split check
|
||
|
|
}
|
||
|
|
|
||
|
|
// MOVW.W R14,$-autosize(SP)
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.Scond |= C_WBIT
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = REGLINK
|
||
|
|
p.To.Type_ = D_OREG
|
||
|
|
p.To.Offset = int64(-autosize)
|
||
|
|
p.To.Reg = REGSP
|
||
|
|
p.Spadj = autosize
|
||
|
|
|
||
|
|
if cursym.Text.Reg&obj.WRAPPER != 0 {
|
||
|
|
// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
|
||
|
|
//
|
||
|
|
// MOVW g_panic(g), R1
|
||
|
|
// CMP $0, R1
|
||
|
|
// B.EQ end
|
||
|
|
// MOVW panic_argp(R1), R2
|
||
|
|
// ADD $(autosize+4), R13, R3
|
||
|
|
// CMP R2, R3
|
||
|
|
// B.NE end
|
||
|
|
// ADD $4, R13, R4
|
||
|
|
// MOVW R4, panic_argp(R1)
|
||
|
|
// end:
|
||
|
|
// NOP
|
||
|
|
//
|
||
|
|
// The NOP is needed to give the jumps somewhere to land.
|
||
|
|
// It is a liblink NOP, not an ARM NOP: it encodes to 0 instruction bytes.
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_OREG
|
||
|
|
p.From.Reg = REGG
|
||
|
|
p.From.Offset = 4 * int64(ctxt.Arch.Ptrsize) // G.panic
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 1
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Offset = 0
|
||
|
|
p.Reg = 1
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ABEQ
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
p1 = p
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_OREG
|
||
|
|
p.From.Reg = 1
|
||
|
|
p.From.Offset = 0 // Panic.argp
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 2
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = AADD
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Offset = int64(autosize) + 4
|
||
|
|
p.Reg = 13
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 3
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 2
|
||
|
|
p.Reg = 3
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ABNE
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
p2 = p
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = AADD
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Offset = 4
|
||
|
|
p.Reg = 13
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 4
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 4
|
||
|
|
p.To.Type_ = D_OREG
|
||
|
|
p.To.Reg = 1
|
||
|
|
p.To.Offset = 0 // Panic.argp
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = ANOP
|
||
|
|
p1.Pcond = p
|
||
|
|
p2.Pcond = p
|
||
|
|
}
|
||
|
|
|
||
|
|
case ARET:
|
||
|
|
nocache5(p)
|
||
|
|
if cursym.Text.Mark&LEAF != 0 {
|
||
|
|
if !(autosize != 0) {
|
||
|
|
p.As = AB
|
||
|
|
p.From = zprg5.From
|
||
|
|
if p.To.Sym != nil { // retjmp
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
} else {
|
||
|
|
|
||
|
|
p.To.Type_ = D_OREG
|
||
|
|
p.To.Offset = 0
|
||
|
|
p.To.Reg = REGLINK
|
||
|
|
}
|
||
|
|
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.Scond |= C_PBIT
|
||
|
|
p.From.Type_ = D_OREG
|
||
|
|
p.From.Offset = int64(autosize)
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = REGPC
|
||
|
|
|
||
|
|
// If there are instructions following
|
||
|
|
// this ARET, they come from a branch
|
||
|
|
// with the same stackframe, so no spadj.
|
||
|
|
if p.To.Sym != nil { // retjmp
|
||
|
|
p.To.Reg = REGLINK
|
||
|
|
q2 = obj.Appendp(ctxt, p)
|
||
|
|
q2.As = AB
|
||
|
|
q2.To.Type_ = D_BRANCH
|
||
|
|
q2.To.Sym = p.To.Sym
|
||
|
|
p.To.Sym = nil
|
||
|
|
p = q2
|
||
|
|
}
|
||
|
|
|
||
|
|
case AADD:
|
||
|
|
if p.From.Type_ == D_CONST && p.From.Reg == NREG && p.To.Type_ == D_REG && p.To.Reg == REGSP {
|
||
|
|
p.Spadj = int32(-p.From.Offset)
|
||
|
|
}
|
||
|
|
|
||
|
|
case ASUB:
|
||
|
|
if p.From.Type_ == D_CONST && p.From.Reg == NREG && p.To.Type_ == D_REG && p.To.Reg == REGSP {
|
||
|
|
p.Spadj = int32(p.From.Offset)
|
||
|
|
}
|
||
|
|
|
||
|
|
case ADIV,
|
||
|
|
ADIVU,
|
||
|
|
AMOD,
|
||
|
|
AMODU:
|
||
|
|
if ctxt.Debugdivmod != 0 {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
if p.From.Type_ != D_REG {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
if p.To.Type_ != D_REG {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
q1 = p
|
||
|
|
|
||
|
|
/* MOV a,4(SP) */
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.Lineno = q1.Lineno
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = q1.From.Reg
|
||
|
|
p.To.Type_ = D_OREG
|
||
|
|
p.To.Reg = REGSP
|
||
|
|
p.To.Offset = 4
|
||
|
|
|
||
|
|
/* MOV b,REGTMP */
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.Lineno = q1.Lineno
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = int8(q1.Reg)
|
||
|
|
if q1.Reg == NREG {
|
||
|
|
p.From.Reg = q1.To.Reg
|
||
|
|
}
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = REGTMP
|
||
|
|
p.To.Offset = 0
|
||
|
|
|
||
|
|
/* CALL appropriate */
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = ABL
|
||
|
|
p.Lineno = q1.Lineno
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
switch o {
|
||
|
|
case ADIV:
|
||
|
|
p.To.Sym = ctxt.Sym_div
|
||
|
|
|
||
|
|
case ADIVU:
|
||
|
|
p.To.Sym = ctxt.Sym_divu
|
||
|
|
|
||
|
|
case AMOD:
|
||
|
|
p.To.Sym = ctxt.Sym_mod
|
||
|
|
|
||
|
|
case AMODU:
|
||
|
|
p.To.Sym = ctxt.Sym_modu
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
/* MOV REGTMP, b */
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.Lineno = q1.Lineno
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = REGTMP
|
||
|
|
p.From.Offset = 0
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = q1.To.Reg
|
||
|
|
|
||
|
|
/* ADD $8,SP */
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AADD
|
||
|
|
p.Lineno = q1.Lineno
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Reg = NREG
|
||
|
|
p.From.Offset = 8
|
||
|
|
p.Reg = NREG
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = REGSP
|
||
|
|
p.Spadj = -8
|
||
|
|
|
||
|
|
/* Keep saved LR at 0(SP) after SP change. */
|
||
|
|
/* MOVW 0(SP), REGTMP; MOVW REGTMP, -8!(SP) */
|
||
|
|
/* TODO: Remove SP adjustments; see issue 6699. */
|
||
|
|
q1.As = AMOVW
|
||
|
|
|
||
|
|
q1.From.Type_ = D_OREG
|
||
|
|
q1.From.Reg = REGSP
|
||
|
|
q1.From.Offset = 0
|
||
|
|
q1.Reg = NREG
|
||
|
|
q1.To.Type_ = D_REG
|
||
|
|
q1.To.Reg = REGTMP
|
||
|
|
|
||
|
|
/* SUB $8,SP */
|
||
|
|
q1 = obj.Appendp(ctxt, q1)
|
||
|
|
|
||
|
|
q1.As = AMOVW
|
||
|
|
q1.From.Type_ = D_REG
|
||
|
|
q1.From.Reg = REGTMP
|
||
|
|
q1.Reg = NREG
|
||
|
|
q1.To.Type_ = D_OREG
|
||
|
|
q1.To.Reg = REGSP
|
||
|
|
q1.To.Offset = -8
|
||
|
|
q1.Scond |= C_WBIT
|
||
|
|
q1.Spadj = 8
|
||
|
|
|
||
|
|
case AMOVW:
|
||
|
|
if (p.Scond&C_WBIT != 0) && p.To.Type_ == D_OREG && p.To.Reg == REGSP {
|
||
|
|
p.Spadj = int32(-p.To.Offset)
|
||
|
|
}
|
||
|
|
if (p.Scond&C_PBIT != 0) && p.From.Type_ == D_OREG && p.From.Reg == REGSP && p.To.Reg != REGPC {
|
||
|
|
p.Spadj = int32(-p.From.Offset)
|
||
|
|
}
|
||
|
|
if p.From.Type_ == D_CONST && p.From.Reg == REGSP && p.To.Type_ == D_REG && p.To.Reg == REGSP {
|
||
|
|
p.Spadj = int32(-p.From.Offset)
|
||
|
|
}
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func softfloat(ctxt *obj.Link, cursym *obj.LSym) {
|
||
|
|
var p *obj.Prog
|
||
|
|
var next *obj.Prog
|
||
|
|
var symsfloat *obj.LSym
|
||
|
|
var wasfloat int
|
||
|
|
|
||
|
|
if ctxt.Goarm > 5 {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
symsfloat = obj.Linklookup(ctxt, "_sfloat", 0)
|
||
|
|
|
||
|
|
wasfloat = 0
|
||
|
|
for p = cursym.Text; p != nil; p = p.Link {
|
||
|
|
if p.Pcond != nil {
|
||
|
|
p.Pcond.Mark |= LABEL
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for p = cursym.Text; p != nil; p = p.Link {
|
||
|
|
switch p.As {
|
||
|
|
case AMOVW:
|
||
|
|
if p.To.Type_ == D_FREG || p.From.Type_ == D_FREG {
|
||
|
|
goto soft
|
||
|
|
}
|
||
|
|
goto notsoft
|
||
|
|
|
||
|
|
case AMOVWD,
|
||
|
|
AMOVWF,
|
||
|
|
AMOVDW,
|
||
|
|
AMOVFW,
|
||
|
|
AMOVFD,
|
||
|
|
AMOVDF,
|
||
|
|
AMOVF,
|
||
|
|
AMOVD,
|
||
|
|
ACMPF,
|
||
|
|
ACMPD,
|
||
|
|
AADDF,
|
||
|
|
AADDD,
|
||
|
|
ASUBF,
|
||
|
|
ASUBD,
|
||
|
|
AMULF,
|
||
|
|
AMULD,
|
||
|
|
ADIVF,
|
||
|
|
ADIVD,
|
||
|
|
ASQRTF,
|
||
|
|
ASQRTD,
|
||
|
|
AABSF,
|
||
|
|
AABSD:
|
||
|
|
goto soft
|
||
|
|
|
||
|
|
default:
|
||
|
|
goto notsoft
|
||
|
|
}
|
||
|
|
|
||
|
|
soft:
|
||
|
|
if !(wasfloat != 0) || (p.Mark&LABEL != 0) {
|
||
|
|
next = ctxt.Arch.Prg()
|
||
|
|
*next = *p
|
||
|
|
|
||
|
|
// BL _sfloat(SB)
|
||
|
|
*p = zprg5
|
||
|
|
|
||
|
|
p.Link = next
|
||
|
|
p.As = ABL
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
p.To.Sym = symsfloat
|
||
|
|
p.Lineno = next.Lineno
|
||
|
|
|
||
|
|
p = next
|
||
|
|
wasfloat = 1
|
||
|
|
}
|
||
|
|
|
||
|
|
continue
|
||
|
|
|
||
|
|
notsoft:
|
||
|
|
wasfloat = 0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32, noctxt int) *obj.Prog {
|
||
|
|
// MOVW g_stackguard(g), R1
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_OREG
|
||
|
|
p.From.Reg = REGG
|
||
|
|
p.From.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
|
||
|
|
if ctxt.Cursym.Cfunc != 0 {
|
||
|
|
p.From.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
|
||
|
|
}
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 1
|
||
|
|
|
||
|
|
if framesize <= obj.StackSmall {
|
||
|
|
// small stack: SP < stackguard
|
||
|
|
// CMP stackguard, SP
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 1
|
||
|
|
p.Reg = REGSP
|
||
|
|
} else if framesize <= obj.StackBig {
|
||
|
|
// large stack: SP-framesize < stackguard-StackSmall
|
||
|
|
// MOVW $-framesize(SP), R2
|
||
|
|
// CMP stackguard, R2
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
p.From.Offset = int64(-framesize)
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 2
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 1
|
||
|
|
p.Reg = 2
|
||
|
|
} 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.
|
||
|
|
// CMP $StackPreempt, R1
|
||
|
|
// MOVW.NE $StackGuard(SP), R2
|
||
|
|
// SUB.NE R1, R2
|
||
|
|
// MOVW.NE $(framesize+(StackGuard-StackSmall)), R3
|
||
|
|
// CMP.NE R3, R2
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Offset = int64(uint32(obj.StackPreempt & (1<<32 - 1)))
|
||
|
|
p.Reg = 1
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Reg = REGSP
|
||
|
|
p.From.Offset = obj.StackGuard
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 2
|
||
|
|
p.Scond = C_SCOND_NE
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ASUB
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 1
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 2
|
||
|
|
p.Scond = C_SCOND_NE
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = AMOVW
|
||
|
|
p.From.Type_ = D_CONST
|
||
|
|
p.From.Offset = int64(framesize) + (obj.StackGuard - obj.StackSmall)
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 3
|
||
|
|
p.Scond = C_SCOND_NE
|
||
|
|
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
p.As = ACMP
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = 3
|
||
|
|
p.Reg = 2
|
||
|
|
p.Scond = C_SCOND_NE
|
||
|
|
}
|
||
|
|
|
||
|
|
// MOVW.LS R14, R3
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = AMOVW
|
||
|
|
p.Scond = C_SCOND_LS
|
||
|
|
p.From.Type_ = D_REG
|
||
|
|
p.From.Reg = REGLINK
|
||
|
|
p.To.Type_ = D_REG
|
||
|
|
p.To.Reg = 3
|
||
|
|
|
||
|
|
// BL.LS runtime.morestack(SB) // modifies LR, returns with LO still asserted
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = ABL
|
||
|
|
p.Scond = C_SCOND_LS
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
if ctxt.Cursym.Cfunc != 0 {
|
||
|
|
p.To.Sym = obj.Linklookup(ctxt, "runtime.morestackc", 0)
|
||
|
|
} else {
|
||
|
|
|
||
|
|
p.To.Sym = ctxt.Symmorestack[noctxt]
|
||
|
|
}
|
||
|
|
|
||
|
|
// BLS start
|
||
|
|
p = obj.Appendp(ctxt, p)
|
||
|
|
|
||
|
|
p.As = ABLS
|
||
|
|
p.To.Type_ = D_BRANCH
|
||
|
|
p.Pcond = ctxt.Cursym.Text.Link
|
||
|
|
|
||
|
|
return p
|
||
|
|
}
|
||
|
|
|
||
|
|
func initdiv(ctxt *obj.Link) {
|
||
|
|
if ctxt.Sym_div != nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
ctxt.Sym_div = obj.Linklookup(ctxt, "_div", 0)
|
||
|
|
ctxt.Sym_divu = obj.Linklookup(ctxt, "_divu", 0)
|
||
|
|
ctxt.Sym_mod = obj.Linklookup(ctxt, "_mod", 0)
|
||
|
|
ctxt.Sym_modu = obj.Linklookup(ctxt, "_modu", 0)
|
||
|
|
}
|
||
|
|
|
||
|
|
func follow(ctxt *obj.Link, s *obj.LSym) {
|
||
|
|
var firstp *obj.Prog
|
||
|
|
var lastp *obj.Prog
|
||
|
|
|
||
|
|
ctxt.Cursym = s
|
||
|
|
|
||
|
|
firstp = ctxt.Arch.Prg()
|
||
|
|
lastp = firstp
|
||
|
|
xfol(ctxt, s.Text, &lastp)
|
||
|
|
lastp.Link = nil
|
||
|
|
s.Text = firstp.Link
|
||
|
|
}
|
||
|
|
|
||
|
|
func relinv(a int) int {
|
||
|
|
switch a {
|
||
|
|
case ABEQ:
|
||
|
|
return ABNE
|
||
|
|
case ABNE:
|
||
|
|
return ABEQ
|
||
|
|
case ABCS:
|
||
|
|
return ABCC
|
||
|
|
case ABHS:
|
||
|
|
return ABLO
|
||
|
|
case ABCC:
|
||
|
|
return ABCS
|
||
|
|
case ABLO:
|
||
|
|
return ABHS
|
||
|
|
case ABMI:
|
||
|
|
return ABPL
|
||
|
|
case ABPL:
|
||
|
|
return ABMI
|
||
|
|
case ABVS:
|
||
|
|
return ABVC
|
||
|
|
case ABVC:
|
||
|
|
return ABVS
|
||
|
|
case ABHI:
|
||
|
|
return ABLS
|
||
|
|
case ABLS:
|
||
|
|
return ABHI
|
||
|
|
case ABGE:
|
||
|
|
return ABLT
|
||
|
|
case ABLT:
|
||
|
|
return ABGE
|
||
|
|
case ABGT:
|
||
|
|
return ABLE
|
||
|
|
case ABLE:
|
||
|
|
return ABGT
|
||
|
|
}
|
||
|
|
|
||
|
|
log.Fatalf("unknown relation: %s", anames5[a])
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
|
||
|
|
func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) {
|
||
|
|
var q *obj.Prog
|
||
|
|
var r *obj.Prog
|
||
|
|
var a int
|
||
|
|
var i int
|
||
|
|
|
||
|
|
loop:
|
||
|
|
if p == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
a = int(p.As)
|
||
|
|
if a == AB {
|
||
|
|
q = p.Pcond
|
||
|
|
if q != nil && q.As != ATEXT {
|
||
|
|
p.Mark |= FOLL
|
||
|
|
p = q
|
||
|
|
if !(p.Mark&FOLL != 0) {
|
||
|
|
goto loop
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if p.Mark&FOLL != 0 {
|
||
|
|
i = 0
|
||
|
|
q = p
|
||
|
|
for ; i < 4; (func() { i++; q = q.Link })() {
|
||
|
|
if q == *last || q == nil {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
a = int(q.As)
|
||
|
|
if a == ANOP {
|
||
|
|
i--
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if a == AB || (a == ARET && q.Scond == C_SCOND_NONE) || a == ARFE || a == AUNDEF {
|
||
|
|
goto copy
|
||
|
|
}
|
||
|
|
if q.Pcond == nil || (q.Pcond.Mark&FOLL != 0) {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if a != ABEQ && a != ABNE {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
copy:
|
||
|
|
for {
|
||
|
|
r = ctxt.Arch.Prg()
|
||
|
|
*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 == ARET && q.Scond == C_SCOND_NONE) || a == ARFE || a == AUNDEF {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
r.As = ABNE
|
||
|
|
if a == ABNE {
|
||
|
|
r.As = ABEQ
|
||
|
|
}
|
||
|
|
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.Arch.Prg()
|
||
|
|
q.As = int16(a)
|
||
|
|
q.Lineno = p.Lineno
|
||
|
|
q.To.Type_ = D_BRANCH
|
||
|
|
q.To.Offset = p.Pc
|
||
|
|
q.Pcond = p
|
||
|
|
p = q
|
||
|
|
}
|
||
|
|
|
||
|
|
p.Mark |= FOLL
|
||
|
|
(*last).Link = p
|
||
|
|
*last = p
|
||
|
|
if a == AB || (a == ARET && p.Scond == C_SCOND_NONE) || a == ARFE || a == AUNDEF {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
if p.Pcond != nil {
|
||
|
|
if a != ABL && a != ABX && p.Link != nil {
|
||
|
|
q = obj.Brchain(ctxt, p.Link)
|
||
|
|
if a != ATEXT && a != ABCASE {
|
||
|
|
if q != nil && (q.Mark&FOLL != 0) {
|
||
|
|
p.As = int16(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
|
||
|
|
}
|
||
|
|
|
||
|
|
var Linkarm = obj.LinkArch{
|
||
|
|
ByteOrder: binary.LittleEndian,
|
||
|
|
Pconv: Pconv,
|
||
|
|
Name: "arm",
|
||
|
|
Thechar: '5',
|
||
|
|
Endian: obj.LittleEndian,
|
||
|
|
Addstacksplit: addstacksplit,
|
||
|
|
Assemble: span5,
|
||
|
|
Datasize: datasize,
|
||
|
|
Follow: follow,
|
||
|
|
Iscall: iscall,
|
||
|
|
Isdata: isdata,
|
||
|
|
Prg: prg,
|
||
|
|
Progedit: progedit,
|
||
|
|
Settextflag: settextflag,
|
||
|
|
Symtype: symtype,
|
||
|
|
Textflag: textflag,
|
||
|
|
Minlc: 4,
|
||
|
|
Ptrsize: 4,
|
||
|
|
Regsize: 4,
|
||
|
|
D_ADDR: D_ADDR,
|
||
|
|
D_AUTO: D_AUTO,
|
||
|
|
D_BRANCH: D_BRANCH,
|
||
|
|
D_CONST: D_CONST,
|
||
|
|
D_EXTERN: D_EXTERN,
|
||
|
|
D_FCONST: D_FCONST,
|
||
|
|
D_NONE: D_NONE,
|
||
|
|
D_PARAM: D_PARAM,
|
||
|
|
D_SCONST: D_SCONST,
|
||
|
|
D_STATIC: D_STATIC,
|
||
|
|
D_OREG: D_OREG,
|
||
|
|
ACALL: ABL,
|
||
|
|
ADATA: ADATA,
|
||
|
|
AEND: AEND,
|
||
|
|
AFUNCDATA: AFUNCDATA,
|
||
|
|
AGLOBL: AGLOBL,
|
||
|
|
AJMP: AB,
|
||
|
|
ANOP: ANOP,
|
||
|
|
APCDATA: APCDATA,
|
||
|
|
ARET: ARET,
|
||
|
|
ATEXT: ATEXT,
|
||
|
|
ATYPE: ATYPE,
|
||
|
|
AUSEFIELD: AUSEFIELD,
|
||
|
|
}
|