diff options
Diffstat (limited to 'vendor/github.com/google/gops/internal/obj/s390x/objz.go')
| -rw-r--r-- | vendor/github.com/google/gops/internal/obj/s390x/objz.go | 1029 |
1 files changed, 0 insertions, 1029 deletions
diff --git a/vendor/github.com/google/gops/internal/obj/s390x/objz.go b/vendor/github.com/google/gops/internal/obj/s390x/objz.go deleted file mode 100644 index bbf4c35..0000000 --- a/vendor/github.com/google/gops/internal/obj/s390x/objz.go +++ /dev/null @@ -1,1029 +0,0 @@ -// 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 ( - "fmt" - "math" - - "github.com/google/gops/internal/obj" - "github.com/google/gops/internal/sys" -) - -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("$f32.%08x", i32) - s := obj.Linklookup(ctxt, literal, 0) - s.Size = 4 - p.From.Type = obj.TYPE_MEM - p.From.Sym = s - p.From.Sym.Set(obj.AttrLocal, true) - p.From.Name = obj.NAME_EXTERN - p.From.Offset = 0 - } - - case AFMOVD: - if p.From.Type == obj.TYPE_FCONST { - i64 := math.Float64bits(p.From.Val.(float64)) - if i64 == 0 { // +0 - break - } - literal := fmt.Sprintf("$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.Set(obj.AttrLocal, 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.Set(obj.AttrLocal, 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 && isint32(-p.From.Offset) { - p.From.Offset = -p.From.Offset - p.As = AADDC - } - - case ASUB: - if p.From.Type == obj.TYPE_CONST && isint32(-p.From.Offset) { - p.From.Offset = -p.From.Offset - p.As = AADD - } - } - - if 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 { - ctxt.Logf("%5.2f noops\n", obj.Cputime()) - } - - 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 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, - ABLEU, - ABLTU, - 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 { - // 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()) - } - - if p.Mark&LEAF != 0 && autosize < obj.StackSmall { - // A leaf function with a small stack can be marked - // NOSPLIT, avoiding a stack check. - p.From3.Offset |= obj.NOSPLIT - } - - 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 { - // Make sure to save link register for non-empty frame, even if - // it is a leaf function, so that traceback works. - // Store link register before decrementing SP, so if a signal comes - // during the execution of the function prologue, the traceback - // code will not see a half-updated stack frame. - q = obj.Appendp(ctxt, p) - q.As = AMOVD - q.From.Type = obj.TYPE_REG - q.From.Reg = REG_LR - q.To.Type = obj.TYPE_MEM - q.To.Reg = REGSP - q.To.Offset = int64(-autosize) - - q = obj.Appendp(ctxt, q) - 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.Set(obj.AttrLeaf, true) - break - } - - 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 R3, $0 - // BEQ end - // MOVD panic_argp(R3), R4 - // ADD $(autosize+8), R1, R5 - // CMP R4, R5 - // BNE end - // ADD $8, R1, R6 - // MOVD R6, panic_argp(R3) - // end: - // NOP - // - // The NOP is needed to give the jumps somewhere to land. - // It is a liblink NOP, not a s390x NOP: it encodes to 0 instruction bytes. - - q = obj.Appendp(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_R3 - q.To.Type = obj.TYPE_CONST - q.To.Offset = 0 - - 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, autosize) // 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, framesize int32) *obj.Prog { - // Now we are at the end of the function, but logically - // we are still in function prologue. We need to fix the - // SP data and PCDATA. - spfix := obj.Appendp(ctxt, p) - spfix.As = obj.ANOP - spfix.Spadj = -framesize - - pcdata := obj.Appendp(ctxt, spfix) - pcdata.Lineno = ctxt.Cursym.Text.Lineno - pcdata.Mode = ctxt.Cursym.Text.Mode - pcdata.As = obj.APCDATA - pcdata.From.Type = obj.TYPE_CONST - pcdata.From.Offset = obj.PCDATA_StackMapIndex - pcdata.To.Type = obj.TYPE_CONST - pcdata.To.Offset = -1 // pcdata starts at -1 at function entry - - // MOVD LR, R5 - p = obj.Appendp(ctxt, pcdata) - 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, - ANEGW: true, - AVONE: true, - AVZERO: true, -} - -var Links390x = obj.LinkArch{ - Arch: sys.ArchS390X, - Preprocess: preprocess, - Assemble: spanz, - Follow: follow, - Progedit: progedit, - UnaryDst: unaryDst, -} |