| // Based on cmd/internal/obj/ppc64/obj9.go. |
| // |
| // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) |
| // Portions Copyright © 1997-1999 Vita Nuova Limited |
| // Portions Copyright © 2000-2008 Vita Nuova Holdings Limited (www.vitanuova.com) |
| // Portions Copyright © 2004,2006 Bruce Ellis |
| // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) |
| // Revisions Copyright © 2000-2008 Lucent Technologies Inc. and others |
| // Portions Copyright © 2009 The Go Authors. All rights reserved. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| package s390x |
| |
| import ( |
| "cmd/internal/obj" |
| "cmd/internal/sys" |
| "fmt" |
| "math" |
| ) |
| |
| func progedit(ctxt *obj.Link, p *obj.Prog) { |
| p.From.Class = 0 |
| p.To.Class = 0 |
| |
| // Rewrite BR/BL to symbol as TYPE_BRANCH. |
| switch p.As { |
| case ABR, |
| ABL, |
| obj.ARET, |
| obj.ADUFFZERO, |
| obj.ADUFFCOPY: |
| if p.To.Sym != nil { |
| p.To.Type = obj.TYPE_BRANCH |
| } |
| } |
| |
| // Rewrite float constants to values stored in memory unless they are +0. |
| switch p.As { |
| case AFMOVS: |
| if p.From.Type == obj.TYPE_FCONST { |
| f32 := float32(p.From.Val.(float64)) |
| i32 := math.Float32bits(f32) |
| if i32 == 0 { // +0 |
| break |
| } |
| literal := fmt.Sprintf("$f32.%08x", i32) |
| s := obj.Linklookup(ctxt, literal, 0) |
| s.Size = 4 |
| p.From.Type = obj.TYPE_MEM |
| p.From.Sym = s |
| p.From.Sym.Local = true |
| p.From.Name = obj.NAME_EXTERN |
| p.From.Offset = 0 |
| } |
| |
| case AFMOVD: |
| if p.From.Type == obj.TYPE_FCONST { |
| i64 := math.Float64bits(p.From.Val.(float64)) |
| if i64 == 0 { // +0 |
| break |
| } |
| literal := fmt.Sprintf("$f64.%016x", i64) |
| s := obj.Linklookup(ctxt, literal, 0) |
| s.Size = 8 |
| p.From.Type = obj.TYPE_MEM |
| p.From.Sym = s |
| p.From.Sym.Local = true |
| p.From.Name = obj.NAME_EXTERN |
| p.From.Offset = 0 |
| } |
| |
| // put constants not loadable by LOAD IMMEDIATE into memory |
| case AMOVD: |
| if p.From.Type == obj.TYPE_CONST { |
| val := p.From.Offset |
| if int64(int32(val)) != val && |
| int64(uint32(val)) != val && |
| int64(uint64(val)&(0xffffffff<<32)) != val { |
| literal := fmt.Sprintf("$i64.%016x", uint64(p.From.Offset)) |
| s := obj.Linklookup(ctxt, literal, 0) |
| s.Size = 8 |
| p.From.Type = obj.TYPE_MEM |
| p.From.Sym = s |
| p.From.Sym.Local = true |
| p.From.Name = obj.NAME_EXTERN |
| p.From.Offset = 0 |
| } |
| } |
| } |
| |
| // Rewrite SUB constants into ADD. |
| switch p.As { |
| case ASUBC: |
| if p.From.Type == obj.TYPE_CONST { |
| p.From.Offset = -p.From.Offset |
| p.As = AADDC |
| } |
| |
| case ASUB: |
| if p.From.Type == obj.TYPE_CONST { |
| p.From.Offset = -p.From.Offset |
| p.As = AADD |
| } |
| } |
| |
| if ctxt.Flag_dynlink { |
| rewriteToUseGot(ctxt, p) |
| } |
| } |
| |
| // Rewrite p, if necessary, to access global data via the global offset table. |
| func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog) { |
| // At the moment EXRL instructions are not emitted by the compiler and only reference local symbols in |
| // assembly code. |
| if p.As == AEXRL { |
| return |
| } |
| |
| // We only care about global data: NAME_EXTERN means a global |
| // symbol in the Go sense, and p.Sym.Local is true for a few |
| // internally defined symbols. |
| 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.To.Type != obj.TYPE_REG || p.As != AMOVD { |
| ctxt.Diag("do not know how to handle LEA-type insn to non-register in %v with -dynlink", p) |
| } |
| p.From.Type = obj.TYPE_MEM |
| p.From.Name = obj.NAME_GOTREF |
| q := p |
| if p.From.Offset != 0 { |
| q = obj.Appendp(ctxt, p) |
| 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.From3 != nil && p.From3.Name == obj.NAME_EXTERN { |
| ctxt.Diag("don't know how to handle %v with -dynlink", p) |
| } |
| var source *obj.Addr |
| // MOVD sym, Ry becomes MOVD sym@GOT, REGTMP; MOVD (REGTMP), Ry |
| // MOVD 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 { |
| 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 == obj.STLSBSS { |
| return |
| } |
| if source.Type != obj.TYPE_MEM { |
| ctxt.Diag("don't know how to handle %v with -dynlink", p) |
| } |
| p1 := obj.Appendp(ctxt, p) |
| p2 := obj.Appendp(ctxt, p1) |
| |
| 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) { |
| // TODO(minux): add morestack short-cuts with small fixed frame-size. |
| ctxt.Cursym = cursym |
| |
| if cursym.Text == nil || cursym.Text.Link == nil { |
| return |
| } |
| |
| p := cursym.Text |
| textstksiz := p.To.Offset |
| if textstksiz == -8 { |
| // Compatibility hack. |
| p.From3.Offset |= obj.NOFRAME |
| textstksiz = 0 |
| } |
| if textstksiz%8 != 0 { |
| ctxt.Diag("frame size %d not a multiple of 8", textstksiz) |
| } |
| if p.From3.Offset&obj.NOFRAME != 0 { |
| if textstksiz != 0 { |
| ctxt.Diag("NOFRAME functions must have a frame size of 0, not %d", textstksiz) |
| } |
| } |
| |
| cursym.Args = p.To.Val.(int32) |
| cursym.Locals = int32(textstksiz) |
| |
| /* |
| * find leaf subroutines |
| * strip NOPs |
| * expand RET |
| * expand BECOME pseudo |
| */ |
| if ctxt.Debugvlog != 0 { |
| fmt.Fprintf(ctxt.Bso, "%5.2f noops\n", obj.Cputime()) |
| } |
| ctxt.Bso.Flush() |
| |
| var q *obj.Prog |
| var q1 *obj.Prog |
| for p := cursym.Text; p != nil; p = p.Link { |
| switch p.As { |
| /* too hard, just leave alone */ |
| case obj.ATEXT: |
| q = p |
| |
| p.Mark |= LABEL | LEAF | SYNC |
| if p.Link != nil { |
| p.Link.Mark |= LABEL |
| } |
| |
| case ANOR: |
| q = p |
| if p.To.Type == obj.TYPE_REG { |
| if p.To.Reg == REGZERO { |
| p.Mark |= LABEL | SYNC |
| } |
| } |
| |
| case ASYNC, |
| AWORD: |
| q = p |
| p.Mark |= LABEL | SYNC |
| continue |
| |
| case AMOVW, AMOVWZ, AMOVD: |
| q = p |
| if p.From.Reg >= REG_RESERVED || p.To.Reg >= REG_RESERVED { |
| p.Mark |= LABEL | SYNC |
| } |
| continue |
| |
| case AFABS, |
| AFADD, |
| AFDIV, |
| AFMADD, |
| AFMOVD, |
| AFMOVS, |
| AFMSUB, |
| AFMUL, |
| AFNABS, |
| AFNEG, |
| AFNMADD, |
| AFNMSUB, |
| ALEDBR, |
| ALDEBR, |
| AFSUB: |
| q = p |
| |
| p.Mark |= FLOAT |
| continue |
| |
| case ABL, |
| ABCL, |
| obj.ADUFFZERO, |
| obj.ADUFFCOPY: |
| cursym.Text.Mark &^= LEAF |
| fallthrough |
| |
| case ABC, |
| ABEQ, |
| ABGE, |
| ABGT, |
| ABLE, |
| ABLT, |
| ABNE, |
| ABR, |
| ABVC, |
| ABVS, |
| ACMPBEQ, |
| ACMPBGE, |
| ACMPBGT, |
| ACMPBLE, |
| ACMPBLT, |
| ACMPBNE, |
| ACMPUBEQ, |
| ACMPUBGE, |
| ACMPUBGT, |
| ACMPUBLE, |
| ACMPUBLT, |
| ACMPUBNE: |
| p.Mark |= BRANCH |
| q = p |
| q1 = p.Pcond |
| if q1 != nil { |
| for q1.As == obj.ANOP { |
| q1 = q1.Link |
| p.Pcond = q1 |
| } |
| |
| if q1.Mark&LEAF == 0 { |
| q1.Mark |= LABEL |
| } |
| } else { |
| p.Mark |= LABEL |
| } |
| q1 = p.Link |
| if q1 != nil { |
| q1.Mark |= LABEL |
| } |
| continue |
| |
| case AFCMPO, AFCMPU: |
| q = p |
| p.Mark |= FCMP | FLOAT |
| continue |
| |
| case obj.ARET: |
| q = p |
| if p.Link != nil { |
| p.Link.Mark |= LABEL |
| } |
| continue |
| |
| case obj.ANOP: |
| q1 = p.Link |
| q.Link = q1 /* q is non-nop */ |
| q1.Mark |= p.Mark |
| continue |
| |
| default: |
| q = p |
| continue |
| } |
| } |
| |
| autosize := int32(0) |
| var p1 *obj.Prog |
| var p2 *obj.Prog |
| var pLast *obj.Prog |
| var pPre *obj.Prog |
| var pPreempt *obj.Prog |
| wasSplit := false |
| for p := cursym.Text; p != nil; p = p.Link { |
| pLast = p |
| switch p.As { |
| case obj.ATEXT: |
| autosize = int32(textstksiz) |
| |
| if p.Mark&LEAF != 0 && autosize == 0 && p.From3.Offset&obj.NOFRAME == 0 { |
| // A leaf function with no locals has no frame. |
| p.From3.Offset |= obj.NOFRAME |
| } |
| |
| if p.From3.Offset&obj.NOFRAME == 0 { |
| // If there is a stack frame at all, it includes |
| // space to save the LR. |
| autosize += int32(ctxt.FixedFrameSize()) |
| } |
| |
| p.To.Offset = int64(autosize) |
| |
| q = p |
| |
| if p.From3.Offset&obj.NOSPLIT == 0 { |
| p, pPreempt = stacksplitPre(ctxt, p, autosize) // emit pre part of split check |
| pPre = p |
| wasSplit = true //need post part of split |
| } |
| |
| if autosize != 0 { |
| q = obj.Appendp(ctxt, p) |
| q.As = AMOVD |
| q.From.Type = obj.TYPE_ADDR |
| q.From.Offset = int64(-autosize) |
| q.From.Reg = REGSP // not actually needed - REGSP is assumed if no reg is provided |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REGSP |
| q.Spadj = autosize |
| } else if cursym.Text.Mark&LEAF == 0 { |
| // A very few functions that do not return to their caller |
| // (e.g. gogo) are not identified as leaves but still have |
| // no frame. |
| cursym.Text.Mark |= LEAF |
| } |
| |
| if cursym.Text.Mark&LEAF != 0 { |
| cursym.Leaf = true |
| break |
| } |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = AMOVD |
| q.From.Type = obj.TYPE_REG |
| q.From.Reg = REG_LR |
| q.To.Type = obj.TYPE_MEM |
| q.To.Reg = REGSP |
| q.To.Offset = 0 |
| |
| if cursym.Text.From3.Offset&obj.WRAPPER != 0 { |
| // if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame |
| // |
| // MOVD g_panic(g), R3 |
| // CMP R0, R3 |
| // BEQ end |
| // MOVD panic_argp(R3), R4 |
| // ADD $(autosize+8), R1, R5 |
| // CMP R4, R5 |
| // BNE end |
| // ADD $8, R1, R6 |
| // MOVD R6, panic_argp(R3) |
| // end: |
| // NOP |
| // |
| // The NOP is needed to give the jumps somewhere to land. |
| // It is a liblink NOP, not a s390x NOP: it encodes to 0 instruction bytes. |
| |
| q = obj.Appendp(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_R3 |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = ACMP |
| q.From.Type = obj.TYPE_REG |
| q.From.Reg = REG_R0 |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_R3 |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = ABEQ |
| q.To.Type = obj.TYPE_BRANCH |
| p1 = q |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = AMOVD |
| q.From.Type = obj.TYPE_MEM |
| q.From.Reg = REG_R3 |
| q.From.Offset = 0 // Panic.argp |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_R4 |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = AADD |
| q.From.Type = obj.TYPE_CONST |
| q.From.Offset = int64(autosize) + ctxt.FixedFrameSize() |
| q.Reg = REGSP |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_R5 |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = ACMP |
| q.From.Type = obj.TYPE_REG |
| q.From.Reg = REG_R4 |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_R5 |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = ABNE |
| q.To.Type = obj.TYPE_BRANCH |
| p2 = q |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = AADD |
| q.From.Type = obj.TYPE_CONST |
| q.From.Offset = ctxt.FixedFrameSize() |
| q.Reg = REGSP |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_R6 |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = AMOVD |
| q.From.Type = obj.TYPE_REG |
| q.From.Reg = REG_R6 |
| q.To.Type = obj.TYPE_MEM |
| q.To.Reg = REG_R3 |
| q.To.Offset = 0 // Panic.argp |
| |
| q = obj.Appendp(ctxt, q) |
| |
| q.As = obj.ANOP |
| p1.Pcond = q |
| p2.Pcond = q |
| } |
| |
| case obj.ARET: |
| if p.From.Type == obj.TYPE_CONST { |
| ctxt.Diag("using BECOME (%v) is not supported!", p) |
| break |
| } |
| |
| retTarget := p.To.Sym |
| |
| if cursym.Text.Mark&LEAF != 0 { |
| if autosize == 0 { |
| p.As = ABR |
| p.From = obj.Addr{} |
| if retTarget == nil { |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_LR |
| } else { |
| p.To.Type = obj.TYPE_BRANCH |
| p.To.Sym = retTarget |
| } |
| p.Mark |= BRANCH |
| break |
| } |
| |
| p.As = AADD |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = int64(autosize) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REGSP |
| p.Spadj = -autosize |
| |
| q = obj.Appendp(ctxt, p) |
| q.As = ABR |
| q.From = obj.Addr{} |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_LR |
| q.Mark |= BRANCH |
| q.Spadj = autosize |
| break |
| } |
| |
| p.As = AMOVD |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = REGSP |
| p.From.Offset = 0 |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_LR |
| |
| q = p |
| |
| if autosize != 0 { |
| q = obj.Appendp(ctxt, q) |
| q.As = AADD |
| q.From.Type = obj.TYPE_CONST |
| q.From.Offset = int64(autosize) |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REGSP |
| q.Spadj = -autosize |
| } |
| |
| q = obj.Appendp(ctxt, q) |
| q.As = ABR |
| q.From = obj.Addr{} |
| if retTarget == nil { |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = REG_LR |
| } else { |
| q.To.Type = obj.TYPE_BRANCH |
| q.To.Sym = retTarget |
| } |
| q.Mark |= BRANCH |
| q.Spadj = autosize |
| |
| case AADD: |
| if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.From.Type == obj.TYPE_CONST { |
| p.Spadj = int32(-p.From.Offset) |
| } |
| } |
| } |
| if wasSplit { |
| pLast = stacksplitPost(ctxt, pLast, pPre, pPreempt) // emit post part of split check |
| } |
| } |
| |
| /* |
| // instruction scheduling |
| if(debug['Q'] == 0) |
| return; |
| |
| curtext = nil; |
| q = nil; // p - 1 |
| q1 = firstp; // top of block |
| o = 0; // count of instructions |
| for(p = firstp; p != nil; p = p1) { |
| p1 = p->link; |
| o++; |
| if(p->mark & NOSCHED){ |
| if(q1 != p){ |
| sched(q1, q); |
| } |
| for(; p != nil; p = p->link){ |
| if(!(p->mark & NOSCHED)) |
| break; |
| q = p; |
| } |
| p1 = p; |
| q1 = p; |
| o = 0; |
| continue; |
| } |
| if(p->mark & (LABEL|SYNC)) { |
| if(q1 != p) |
| sched(q1, q); |
| q1 = p; |
| o = 1; |
| } |
| if(p->mark & (BRANCH|SYNC)) { |
| sched(q1, p); |
| q1 = p1; |
| o = 0; |
| } |
| if(o >= NSCHED) { |
| sched(q1, p); |
| q1 = p1; |
| o = 0; |
| } |
| q = p; |
| } |
| */ |
| func stacksplitPre(ctxt *obj.Link, p *obj.Prog, framesize int32) (*obj.Prog, *obj.Prog) { |
| var q *obj.Prog |
| |
| // MOVD g_stackguard(g), R3 |
| p = obj.Appendp(ctxt, p) |
| |
| p.As = AMOVD |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = REGG |
| p.From.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0 |
| if ctxt.Cursym.Cfunc { |
| p.From.Offset = 3 * int64(ctxt.Arch.PtrSize) // G.stackguard1 |
| } |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_R3 |
| |
| q = nil |
| if framesize <= obj.StackSmall { |
| // small stack: SP < stackguard |
| // CMP stackguard, SP |
| |
| //p.To.Type = obj.TYPE_REG |
| //p.To.Reg = REGSP |
| |
| // q1: BLT done |
| |
| p = obj.Appendp(ctxt, p) |
| //q1 = p |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = REG_R3 |
| p.Reg = REGSP |
| p.As = ACMPUBGE |
| p.To.Type = obj.TYPE_BRANCH |
| //p = obj.Appendp(ctxt, p) |
| |
| //p.As = ACMPU |
| //p.From.Type = obj.TYPE_REG |
| //p.From.Reg = REG_R3 |
| //p.To.Type = obj.TYPE_REG |
| //p.To.Reg = REGSP |
| |
| //p = obj.Appendp(ctxt, p) |
| //p.As = ABGE |
| //p.To.Type = obj.TYPE_BRANCH |
| |
| } else if framesize <= obj.StackBig { |
| // large stack: SP-framesize < stackguard-StackSmall |
| // ADD $-framesize, SP, R4 |
| // CMP stackguard, R4 |
| p = obj.Appendp(ctxt, p) |
| |
| p.As = AADD |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = int64(-framesize) |
| p.Reg = REGSP |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_R4 |
| |
| p = obj.Appendp(ctxt, p) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = REG_R3 |
| p.Reg = REG_R4 |
| p.As = ACMPUBGE |
| p.To.Type = obj.TYPE_BRANCH |
| |
| } else { |
| // Such a large stack we need to protect against wraparound. |
| // If SP is close to zero: |
| // SP-stackguard+StackGuard <= framesize + (StackGuard-StackSmall) |
| // The +StackGuard on both sides is required to keep the left side positive: |
| // SP is allowed to be slightly below stackguard. See stack.h. |
| // |
| // Preemption sets stackguard to StackPreempt, a very large value. |
| // That breaks the math above, so we have to check for that explicitly. |
| // // stackguard is R3 |
| // CMP R3, $StackPreempt |
| // BEQ label-of-call-to-morestack |
| // ADD $StackGuard, SP, R4 |
| // SUB R3, R4 |
| // MOVD $(framesize+(StackGuard-StackSmall)), TEMP |
| // CMPUBGE TEMP, R4 |
| p = obj.Appendp(ctxt, p) |
| |
| p.As = ACMP |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = REG_R3 |
| p.To.Type = obj.TYPE_CONST |
| p.To.Offset = obj.StackPreempt |
| |
| p = obj.Appendp(ctxt, p) |
| q = p |
| p.As = ABEQ |
| p.To.Type = obj.TYPE_BRANCH |
| |
| p = obj.Appendp(ctxt, p) |
| p.As = AADD |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = obj.StackGuard |
| p.Reg = REGSP |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_R4 |
| |
| p = obj.Appendp(ctxt, p) |
| p.As = ASUB |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = REG_R3 |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_R4 |
| |
| p = obj.Appendp(ctxt, p) |
| p.As = AMOVD |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = int64(framesize) + obj.StackGuard - obj.StackSmall |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REGTMP |
| |
| p = obj.Appendp(ctxt, p) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = REGTMP |
| p.Reg = REG_R4 |
| p.As = ACMPUBGE |
| p.To.Type = obj.TYPE_BRANCH |
| } |
| |
| return p, q |
| } |
| |
| func stacksplitPost(ctxt *obj.Link, p *obj.Prog, pPre *obj.Prog, pPreempt *obj.Prog) *obj.Prog { |
| |
| // MOVD LR, R5 |
| p = obj.Appendp(ctxt, p) |
| pPre.Pcond = p |
| p.As = AMOVD |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = REG_LR |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = REG_R5 |
| if pPreempt != nil { |
| pPreempt.Pcond = p |
| } |
| |
| // BL runtime.morestack(SB) |
| p = obj.Appendp(ctxt, p) |
| |
| p.As = ABL |
| p.To.Type = obj.TYPE_BRANCH |
| if ctxt.Cursym.Cfunc { |
| p.To.Sym = obj.Linklookup(ctxt, "runtime.morestackc", 0) |
| } else if ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0 { |
| p.To.Sym = obj.Linklookup(ctxt, "runtime.morestack_noctxt", 0) |
| } else { |
| p.To.Sym = obj.Linklookup(ctxt, "runtime.morestack", 0) |
| } |
| |
| // BR start |
| p = obj.Appendp(ctxt, p) |
| |
| p.As = ABR |
| p.To.Type = obj.TYPE_BRANCH |
| p.Pcond = ctxt.Cursym.Text.Link |
| return p |
| } |
| |
| var pc_cnt int64 |
| |
| func follow(ctxt *obj.Link, s *obj.LSym) { |
| ctxt.Cursym = s |
| |
| pc_cnt = 0 |
| firstp := ctxt.NewProg() |
| lastp := firstp |
| xfol(ctxt, s.Text, &lastp) |
| lastp.Link = nil |
| s.Text = firstp.Link |
| } |
| |
| func relinv(a obj.As) obj.As { |
| switch a { |
| case ABEQ: |
| return ABNE |
| case ABNE: |
| return ABEQ |
| |
| case ABGE: |
| return ABLT |
| case ABLT: |
| return ABGE |
| |
| case ABGT: |
| return ABLE |
| case ABLE: |
| return ABGT |
| |
| case ABVC: |
| return ABVS |
| case ABVS: |
| return ABVC |
| } |
| |
| return 0 |
| } |
| |
| func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) { |
| var q *obj.Prog |
| var r *obj.Prog |
| var b obj.As |
| |
| for p != nil { |
| a := p.As |
| if a == ABR { |
| q = p.Pcond |
| if (p.Mark&NOSCHED != 0) || q != nil && (q.Mark&NOSCHED != 0) { |
| p.Mark |= FOLL |
| (*last).Link = p |
| *last = p |
| (*last).Pc = pc_cnt |
| pc_cnt += 1 |
| p = p.Link |
| xfol(ctxt, p, last) |
| p = q |
| if p != nil && p.Mark&FOLL == 0 { |
| continue |
| } |
| return |
| } |
| |
| if q != nil { |
| p.Mark |= FOLL |
| p = q |
| if p.Mark&FOLL == 0 { |
| continue |
| } |
| } |
| } |
| |
| if p.Mark&FOLL != 0 { |
| q = p |
| for i := 0; i < 4; i, q = i+1, q.Link { |
| if q == *last || (q.Mark&NOSCHED != 0) { |
| break |
| } |
| b = 0 /* set */ |
| a = q.As |
| if a == obj.ANOP { |
| i-- |
| continue |
| } |
| if a != ABR && a != obj.ARET { |
| if q.Pcond == nil || (q.Pcond.Mark&FOLL != 0) { |
| continue |
| } |
| b = relinv(a) |
| if b == 0 { |
| continue |
| } |
| } |
| |
| 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 |
| (*last).Pc = pc_cnt |
| pc_cnt += 1 |
| continue |
| } |
| |
| (*last).Link = r |
| *last = r |
| (*last).Pc = pc_cnt |
| pc_cnt += 1 |
| if a == ABR || a == obj.ARET { |
| return |
| } |
| r.As = b |
| 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 = ABR |
| 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 |
| (*last).Pc = pc_cnt |
| pc_cnt += 1 |
| |
| if a == ABR || a == obj.ARET { |
| if p.Mark&NOSCHED != 0 { |
| p = p.Link |
| continue |
| } |
| |
| return |
| } |
| |
| if p.Pcond != nil { |
| if a != ABL && p.Link != nil { |
| xfol(ctxt, p.Link, last) |
| p = p.Pcond |
| if p == nil || (p.Mark&FOLL != 0) { |
| return |
| } |
| continue |
| } |
| } |
| |
| p = p.Link |
| } |
| } |
| |
| var unaryDst = map[obj.As]bool{ |
| ASTCK: true, |
| ASTCKC: true, |
| ASTCKE: true, |
| ASTCKF: true, |
| ANEG: true, |
| AVONE: true, |
| AVZERO: true, |
| } |
| |
| var Links390x = obj.LinkArch{ |
| Arch: sys.ArchS390X, |
| Preprocess: preprocess, |
| Assemble: spanz, |
| Follow: follow, |
| Progedit: progedit, |
| UnaryDst: unaryDst, |
| } |
