diff options
Diffstat (limited to 'vendor/github.com/twitchyliquid64/golang-asm/obj/ppc64/obj9.go')
| -rw-r--r-- | vendor/github.com/twitchyliquid64/golang-asm/obj/ppc64/obj9.go | 1278 |
1 files changed, 0 insertions, 1278 deletions
diff --git a/vendor/github.com/twitchyliquid64/golang-asm/obj/ppc64/obj9.go b/vendor/github.com/twitchyliquid64/golang-asm/obj/ppc64/obj9.go deleted file mode 100644 index 7997b1942..000000000 --- a/vendor/github.com/twitchyliquid64/golang-asm/obj/ppc64/obj9.go +++ /dev/null @@ -1,1278 +0,0 @@ -// cmd/9l/noop.c, cmd/9l/pass.c, cmd/9l/span.c from Vita Nuova. -// -// 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 ppc64 - -import ( - "github.com/twitchyliquid64/golang-asm/obj" - "github.com/twitchyliquid64/golang-asm/objabi" - "github.com/twitchyliquid64/golang-asm/sys" -) - -func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) { - p.From.Class = 0 - p.To.Class = 0 - - c := ctxt9{ctxt: ctxt, newprog: newprog} - - // 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. - switch p.As { - case AFMOVS: - if p.From.Type == obj.TYPE_FCONST { - f32 := float32(p.From.Val.(float64)) - p.From.Type = obj.TYPE_MEM - p.From.Sym = ctxt.Float32Sym(f32) - p.From.Name = obj.NAME_EXTERN - p.From.Offset = 0 - } - - case AFMOVD: - if p.From.Type == obj.TYPE_FCONST { - f64 := p.From.Val.(float64) - // Constant not needed in memory for float +/- 0 - if f64 != 0 { - p.From.Type = obj.TYPE_MEM - p.From.Sym = ctxt.Float64Sym(f64) - p.From.Name = obj.NAME_EXTERN - p.From.Offset = 0 - } - } - - // Put >32-bit constants in memory and load them - case AMOVD: - if p.From.Type == obj.TYPE_CONST && p.From.Name == obj.NAME_NONE && p.From.Reg == 0 && int64(int32(p.From.Offset)) != p.From.Offset { - p.From.Type = obj.TYPE_MEM - p.From.Sym = ctxt.Int64Sym(p.From.Offset) - 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 ASUBCCC: - if p.From.Type == obj.TYPE_CONST { - p.From.Offset = -p.From.Offset - p.As = AADDCCC - } - - case ASUB: - if p.From.Type == obj.TYPE_CONST { - p.From.Offset = -p.From.Offset - p.As = AADD - } - } - if c.ctxt.Headtype == objabi.Haix { - c.rewriteToUseTOC(p) - } else if c.ctxt.Flag_dynlink { - c.rewriteToUseGot(p) - } -} - -// Rewrite p, if necessary, to access a symbol using its TOC anchor. -// This code is for AIX only. -func (c *ctxt9) rewriteToUseTOC(p *obj.Prog) { - if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP { - return - } - - if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO { - // ADUFFZERO/ADUFFCOPY is considered as an ABL except in dynamic - // link where it should be an indirect call. - if !c.ctxt.Flag_dynlink { - return - } - // ADUFFxxx $offset - // becomes - // MOVD runtime.duffxxx@TOC, R12 - // ADD $offset, R12 - // MOVD R12, LR - // BL (LR) - var sym *obj.LSym - if p.As == obj.ADUFFZERO { - sym = c.ctxt.Lookup("runtime.duffzero") - } else { - sym = c.ctxt.Lookup("runtime.duffcopy") - } - // Retrieve or create the TOC anchor. - symtoc := c.ctxt.LookupInit("TOC."+sym.Name, func(s *obj.LSym) { - s.Type = objabi.SDATA - s.Set(obj.AttrDuplicateOK, true) - s.Set(obj.AttrStatic, true) - c.ctxt.Data = append(c.ctxt.Data, s) - s.WriteAddr(c.ctxt, 0, 8, sym, 0) - }) - - offset := p.To.Offset - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Name = obj.NAME_TOCREF - p.From.Sym = symtoc - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R12 - p.To.Name = obj.NAME_NONE - p.To.Offset = 0 - p.To.Sym = nil - p1 := obj.Appendp(p, c.newprog) - p1.As = AADD - p1.From.Type = obj.TYPE_CONST - p1.From.Offset = offset - p1.To.Type = obj.TYPE_REG - p1.To.Reg = REG_R12 - p2 := obj.Appendp(p1, c.newprog) - p2.As = AMOVD - p2.From.Type = obj.TYPE_REG - p2.From.Reg = REG_R12 - p2.To.Type = obj.TYPE_REG - p2.To.Reg = REG_LR - p3 := obj.Appendp(p2, c.newprog) - p3.As = obj.ACALL - p3.To.Type = obj.TYPE_REG - p3.To.Reg = REG_LR - } - - var source *obj.Addr - if p.From.Name == obj.NAME_EXTERN || p.From.Name == obj.NAME_STATIC { - if p.From.Type == obj.TYPE_ADDR { - if p.As == ADWORD { - // ADWORD $sym doesn't need TOC anchor - return - } - if p.As != AMOVD { - c.ctxt.Diag("do not know how to handle TYPE_ADDR in %v", p) - return - } - if p.To.Type != obj.TYPE_REG { - c.ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v", p) - return - } - } else if p.From.Type != obj.TYPE_MEM { - c.ctxt.Diag("do not know how to handle %v without TYPE_MEM", p) - return - } - source = &p.From - - } else if p.To.Name == obj.NAME_EXTERN || p.To.Name == obj.NAME_STATIC { - if p.To.Type != obj.TYPE_MEM { - c.ctxt.Diag("do not know how to handle %v without TYPE_MEM", p) - return - } - if source != nil { - c.ctxt.Diag("cannot handle symbols on both sides in %v", p) - return - } - source = &p.To - } else { - return - - } - - if source.Sym == nil { - c.ctxt.Diag("do not know how to handle nil symbol in %v", p) - return - } - - if source.Sym.Type == objabi.STLSBSS { - return - } - - // Retrieve or create the TOC anchor. - symtoc := c.ctxt.LookupInit("TOC."+source.Sym.Name, func(s *obj.LSym) { - s.Type = objabi.SDATA - s.Set(obj.AttrDuplicateOK, true) - s.Set(obj.AttrStatic, true) - c.ctxt.Data = append(c.ctxt.Data, s) - s.WriteAddr(c.ctxt, 0, 8, source.Sym, 0) - }) - - if source.Type == obj.TYPE_ADDR { - // MOVD $sym, Rx becomes MOVD symtoc, Rx - // MOVD $sym+<off>, Rx becomes MOVD symtoc, Rx; ADD <off>, Rx - p.From.Type = obj.TYPE_MEM - p.From.Sym = symtoc - p.From.Name = obj.NAME_TOCREF - - if p.From.Offset != 0 { - q := obj.Appendp(p, c.newprog) - q.As = AADD - q.From.Type = obj.TYPE_CONST - q.From.Offset = p.From.Offset - p.From.Offset = 0 - q.To = p.To - } - return - - } - - // MOVx sym, Ry becomes MOVD symtoc, REGTMP; MOVx (REGTMP), Ry - // MOVx Ry, sym becomes MOVD symtoc, REGTMP; MOVx Ry, (REGTMP) - // An addition may be inserted between the two MOVs if there is an offset. - - q := obj.Appendp(p, c.newprog) - q.As = AMOVD - q.From.Type = obj.TYPE_MEM - q.From.Sym = symtoc - q.From.Name = obj.NAME_TOCREF - q.To.Type = obj.TYPE_REG - q.To.Reg = REGTMP - - q = obj.Appendp(q, c.newprog) - q.As = p.As - q.From = p.From - q.To = p.To - if p.From.Name != obj.NAME_NONE { - q.From.Type = obj.TYPE_MEM - q.From.Reg = REGTMP - q.From.Name = obj.NAME_NONE - q.From.Sym = nil - } else if p.To.Name != obj.NAME_NONE { - q.To.Type = obj.TYPE_MEM - q.To.Reg = REGTMP - q.To.Name = obj.NAME_NONE - q.To.Sym = nil - } else { - c.ctxt.Diag("unreachable case in rewriteToUseTOC with %v", p) - } - - obj.Nopout(p) -} - -// Rewrite p, if necessary, to access global data via the global offset table. -func (c *ctxt9) rewriteToUseGot(p *obj.Prog) { - if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO { - // ADUFFxxx $offset - // becomes - // MOVD runtime.duffxxx@GOT, R12 - // ADD $offset, R12 - // MOVD R12, LR - // BL (LR) - var sym *obj.LSym - if p.As == obj.ADUFFZERO { - sym = c.ctxt.Lookup("runtime.duffzero") - } else { - sym = c.ctxt.Lookup("runtime.duffcopy") - } - offset := p.To.Offset - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Name = obj.NAME_GOTREF - p.From.Sym = sym - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R12 - p.To.Name = obj.NAME_NONE - p.To.Offset = 0 - p.To.Sym = nil - p1 := obj.Appendp(p, c.newprog) - p1.As = AADD - p1.From.Type = obj.TYPE_CONST - p1.From.Offset = offset - p1.To.Type = obj.TYPE_REG - p1.To.Reg = REG_R12 - p2 := obj.Appendp(p1, c.newprog) - p2.As = AMOVD - p2.From.Type = obj.TYPE_REG - p2.From.Reg = REG_R12 - p2.To.Type = obj.TYPE_REG - p2.To.Reg = REG_LR - p3 := obj.Appendp(p2, c.newprog) - p3.As = obj.ACALL - p3.To.Type = obj.TYPE_REG - p3.To.Reg = REG_LR - } - - // We only care about global data: NAME_EXTERN means a global - // symbol in the Go sense, and p.Sym.Local is true for a few - // internally defined symbols. - if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() { - // MOVD $sym, Rx becomes MOVD sym@GOT, Rx - // MOVD $sym+<off>, Rx becomes MOVD sym@GOT, Rx; ADD <off>, Rx - if p.As != AMOVD { - c.ctxt.Diag("do not know how to handle TYPE_ADDR in %v with -dynlink", p) - } - if p.To.Type != obj.TYPE_REG { - c.ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v with -dynlink", p) - } - p.From.Type = obj.TYPE_MEM - p.From.Name = obj.NAME_GOTREF - if p.From.Offset != 0 { - q := obj.Appendp(p, c.newprog) - q.As = AADD - q.From.Type = obj.TYPE_CONST - q.From.Offset = p.From.Offset - q.To = p.To - p.From.Offset = 0 - } - } - if p.GetFrom3() != nil && p.GetFrom3().Name == obj.NAME_EXTERN { - c.ctxt.Diag("don't know how to handle %v with -dynlink", p) - } - var source *obj.Addr - // MOVx sym, Ry becomes MOVD sym@GOT, REGTMP; MOVx (REGTMP), Ry - // MOVx Ry, sym becomes MOVD sym@GOT, REGTMP; MOVx Ry, (REGTMP) - // An addition may be inserted between the two MOVs if there is an offset. - if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() { - if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() { - c.ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p) - } - source = &p.From - } else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() { - source = &p.To - } else { - return - } - if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP { - return - } - if source.Sym.Type == objabi.STLSBSS { - return - } - if source.Type != obj.TYPE_MEM { - c.ctxt.Diag("don't know how to handle %v with -dynlink", p) - } - p1 := obj.Appendp(p, c.newprog) - p2 := obj.Appendp(p1, c.newprog) - - p1.As = AMOVD - p1.From.Type = obj.TYPE_MEM - p1.From.Sym = source.Sym - p1.From.Name = obj.NAME_GOTREF - p1.To.Type = obj.TYPE_REG - p1.To.Reg = REGTMP - - p2.As = p.As - p2.From = p.From - p2.To = p.To - if p.From.Name == obj.NAME_EXTERN { - p2.From.Reg = REGTMP - p2.From.Name = obj.NAME_NONE - p2.From.Sym = nil - } else if p.To.Name == obj.NAME_EXTERN { - p2.To.Reg = REGTMP - p2.To.Name = obj.NAME_NONE - p2.To.Sym = nil - } else { - return - } - obj.Nopout(p) -} - -func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { - // TODO(minux): add morestack short-cuts with small fixed frame-size. - if cursym.Func.Text == nil || cursym.Func.Text.Link == nil { - return - } - - c := ctxt9{ctxt: ctxt, cursym: cursym, newprog: newprog} - - p := c.cursym.Func.Text - textstksiz := p.To.Offset - if textstksiz == -8 { - // Compatibility hack. - p.From.Sym.Set(obj.AttrNoFrame, true) - textstksiz = 0 - } - if textstksiz%8 != 0 { - c.ctxt.Diag("frame size %d not a multiple of 8", textstksiz) - } - if p.From.Sym.NoFrame() { - if textstksiz != 0 { - c.ctxt.Diag("NOFRAME functions must have a frame size of 0, not %d", textstksiz) - } - } - - c.cursym.Func.Args = p.To.Val.(int32) - c.cursym.Func.Locals = int32(textstksiz) - - /* - * find leaf subroutines - * expand RET - * expand BECOME pseudo - */ - - var q *obj.Prog - var q1 *obj.Prog - for p := c.cursym.Func.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 ALWAR, - ALBAR, - ASTBCCC, - ASTWCCC, - AECIWX, - AECOWX, - AEIEIO, - AICBI, - AISYNC, - ATLBIE, - ATLBIEL, - ASLBIA, - ASLBIE, - ASLBMFEE, - ASLBMFEV, - ASLBMTE, - ADCBF, - ADCBI, - ADCBST, - ADCBT, - ADCBTST, - ADCBZ, - ASYNC, - ATLBSYNC, - APTESYNC, - ALWSYNC, - ATW, - AWORD, - ARFI, - ARFCI, - ARFID, - AHRFID: - q = p - p.Mark |= LABEL | SYNC - continue - - case AMOVW, AMOVWZ, AMOVD: - q = p - if p.From.Reg >= REG_SPECIAL || p.To.Reg >= REG_SPECIAL { - p.Mark |= LABEL | SYNC - } - continue - - case AFABS, - AFABSCC, - AFADD, - AFADDCC, - AFCTIW, - AFCTIWCC, - AFCTIWZ, - AFCTIWZCC, - AFDIV, - AFDIVCC, - AFMADD, - AFMADDCC, - AFMOVD, - AFMOVDU, - /* case AFMOVDS: */ - AFMOVS, - AFMOVSU, - - /* case AFMOVSD: */ - AFMSUB, - AFMSUBCC, - AFMUL, - AFMULCC, - AFNABS, - AFNABSCC, - AFNEG, - AFNEGCC, - AFNMADD, - AFNMADDCC, - AFNMSUB, - AFNMSUBCC, - AFRSP, - AFRSPCC, - AFSUB, - AFSUBCC: - q = p - - p.Mark |= FLOAT - continue - - case ABL, - ABCL, - obj.ADUFFZERO, - obj.ADUFFCOPY: - c.cursym.Func.Text.Mark &^= LEAF - fallthrough - - case ABC, - ABEQ, - ABGE, - ABGT, - ABLE, - ABLT, - ABNE, - ABR, - ABVC, - ABVS: - p.Mark |= BRANCH - q = p - q1 = p.To.Target() - if q1 != nil { - // NOPs are not removed due to #40689. - - 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: - // NOPs are not removed due to - // #40689 - continue - - default: - q = p - continue - } - } - - autosize := int32(0) - var p1 *obj.Prog - var p2 *obj.Prog - for p := c.cursym.Func.Text; p != nil; p = p.Link { - o := p.As - switch o { - case obj.ATEXT: - autosize = int32(textstksiz) - - if p.Mark&LEAF != 0 && autosize == 0 { - // A leaf function with no locals has no frame. - p.From.Sym.Set(obj.AttrNoFrame, true) - } - - if !p.From.Sym.NoFrame() { - // If there is a stack frame at all, it includes - // space to save the LR. - autosize += int32(c.ctxt.FixedFrameSize()) - } - - if p.Mark&LEAF != 0 && autosize < objabi.StackSmall { - // A leaf function with a small stack can be marked - // NOSPLIT, avoiding a stack check. - p.From.Sym.Set(obj.AttrNoSplit, true) - } - - p.To.Offset = int64(autosize) - - q = p - - if c.ctxt.Flag_shared && c.cursym.Name != "runtime.duffzero" && c.cursym.Name != "runtime.duffcopy" { - // When compiling Go into PIC, all functions must start - // with instructions to load the TOC pointer into r2: - // - // addis r2, r12, .TOC.-func@ha - // addi r2, r2, .TOC.-func@l+4 - // - // We could probably skip this prologue in some situations - // but it's a bit subtle. However, it is both safe and - // necessary to leave the prologue off duffzero and - // duffcopy as we rely on being able to jump to a specific - // instruction offset for them. - // - // These are AWORDS because there is no (afaict) way to - // generate the addis instruction except as part of the - // load of a large constant, and in that case there is no - // way to use r12 as the source. - // - // Note that the same condition is tested in - // putelfsym in cmd/link/internal/ld/symtab.go - // where we set the st_other field to indicate - // the presence of these instructions. - q = obj.Appendp(q, c.newprog) - q.As = AWORD - q.Pos = p.Pos - q.From.Type = obj.TYPE_CONST - q.From.Offset = 0x3c4c0000 - q = obj.Appendp(q, c.newprog) - q.As = AWORD - q.Pos = p.Pos - q.From.Type = obj.TYPE_CONST - q.From.Offset = 0x38420000 - rel := obj.Addrel(c.cursym) - rel.Off = 0 - rel.Siz = 8 - rel.Sym = c.ctxt.Lookup(".TOC.") - rel.Type = objabi.R_ADDRPOWER_PCREL - } - - if !c.cursym.Func.Text.From.Sym.NoSplit() { - q = c.stacksplit(q, autosize) // emit split check - } - - // Special handling of the racecall thunk. Assume that its asm code will - // save the link register and update the stack, since that code is - // called directly from C/C++ and can't clobber REGTMP (R31). - if autosize != 0 && c.cursym.Name != "runtime.racecallbackthunk" { - // Save the link register and update the SP. MOVDU is used unless - // the frame size is too large. The link register must be saved - // even for non-empty leaf functions so that traceback works. - if autosize >= -BIG && autosize <= BIG { - // Use MOVDU to adjust R1 when saving R31, if autosize is small. - q = obj.Appendp(q, c.newprog) - q.As = AMOVD - q.Pos = p.Pos - q.From.Type = obj.TYPE_REG - q.From.Reg = REG_LR - q.To.Type = obj.TYPE_REG - q.To.Reg = REGTMP - - q = obj.Appendp(q, c.newprog) - q.As = AMOVDU - q.Pos = p.Pos - q.From.Type = obj.TYPE_REG - q.From.Reg = REGTMP - q.To.Type = obj.TYPE_MEM - q.To.Offset = int64(-autosize) - q.To.Reg = REGSP - q.Spadj = autosize - } else { - // Frame size is too large for a MOVDU instruction. - // Store link register before decrementing SP, so if a signal comes - // during the execution of the function prologue, the traceback - // code will not see a half-updated stack frame. - // This sequence is not async preemptible, as if we open a frame - // at the current SP, it will clobber the saved LR. - q = obj.Appendp(q, c.newprog) - q.As = AMOVD - q.Pos = p.Pos - q.From.Type = obj.TYPE_REG - q.From.Reg = REG_LR - q.To.Type = obj.TYPE_REG - q.To.Reg = REG_R29 // REGTMP may be used to synthesize large offset in the next instruction - - q = c.ctxt.StartUnsafePoint(q, c.newprog) - - q = obj.Appendp(q, c.newprog) - q.As = AMOVD - q.Pos = p.Pos - q.From.Type = obj.TYPE_REG - q.From.Reg = REG_R29 - q.To.Type = obj.TYPE_MEM - q.To.Offset = int64(-autosize) - q.To.Reg = REGSP - - q = obj.Appendp(q, c.newprog) - q.As = AADD - q.Pos = p.Pos - 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 = c.ctxt.EndUnsafePoint(q, c.newprog, -1) - - } - } else if c.cursym.Func.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. - c.cursym.Func.Text.Mark |= LEAF - } - - if c.cursym.Func.Text.Mark&LEAF != 0 { - c.cursym.Set(obj.AttrLeaf, true) - break - } - - if c.ctxt.Flag_shared { - q = obj.Appendp(q, c.newprog) - q.As = AMOVD - q.Pos = p.Pos - q.From.Type = obj.TYPE_REG - q.From.Reg = REG_R2 - q.To.Type = obj.TYPE_MEM - q.To.Reg = REGSP - q.To.Offset = 24 - } - - if c.cursym.Func.Text.From.Sym.Wrapper() { - // 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 ppc64 NOP: it encodes to 0 instruction bytes. - - q = obj.Appendp(q, c.newprog) - - q.As = AMOVD - q.From.Type = obj.TYPE_MEM - q.From.Reg = REGG - q.From.Offset = 4 * int64(c.ctxt.Arch.PtrSize) // G.panic - q.To.Type = obj.TYPE_REG - q.To.Reg = REG_R3 - - q = obj.Appendp(q, c.newprog) - 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(q, c.newprog) - q.As = ABEQ - q.To.Type = obj.TYPE_BRANCH - p1 = q - - q = obj.Appendp(q, c.newprog) - 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(q, c.newprog) - q.As = AADD - q.From.Type = obj.TYPE_CONST - q.From.Offset = int64(autosize) + c.ctxt.FixedFrameSize() - q.Reg = REGSP - q.To.Type = obj.TYPE_REG - q.To.Reg = REG_R5 - - q = obj.Appendp(q, c.newprog) - 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(q, c.newprog) - q.As = ABNE - q.To.Type = obj.TYPE_BRANCH - p2 = q - - q = obj.Appendp(q, c.newprog) - q.As = AADD - q.From.Type = obj.TYPE_CONST - q.From.Offset = c.ctxt.FixedFrameSize() - q.Reg = REGSP - q.To.Type = obj.TYPE_REG - q.To.Reg = REG_R6 - - q = obj.Appendp(q, c.newprog) - 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(q, c.newprog) - - q.As = obj.ANOP - p1.To.SetTarget(q) - p2.To.SetTarget(q) - } - - case obj.ARET: - if p.From.Type == obj.TYPE_CONST { - c.ctxt.Diag("using BECOME (%v) is not supported!", p) - break - } - - retTarget := p.To.Sym - - if c.cursym.Func.Text.Mark&LEAF != 0 { - if autosize == 0 || c.cursym.Name == "runtime.racecallbackthunk" { - 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 = c.newprog() - q.As = ABR - q.Pos = p.Pos - q.To.Type = obj.TYPE_REG - q.To.Reg = REG_LR - q.Mark |= BRANCH - q.Spadj = +autosize - - q.Link = p.Link - p.Link = q - break - } - - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Offset = 0 - p.From.Reg = REGSP - p.To.Type = obj.TYPE_REG - p.To.Reg = REGTMP - - q = c.newprog() - q.As = AMOVD - q.Pos = p.Pos - q.From.Type = obj.TYPE_REG - q.From.Reg = REGTMP - q.To.Type = obj.TYPE_REG - q.To.Reg = REG_LR - - q.Link = p.Link - p.Link = q - p = q - - if false { - // Debug bad returns - q = c.newprog() - - q.As = AMOVD - q.Pos = p.Pos - q.From.Type = obj.TYPE_MEM - q.From.Offset = 0 - q.From.Reg = REGTMP - q.To.Type = obj.TYPE_REG - q.To.Reg = REGTMP - - q.Link = p.Link - p.Link = q - p = q - } - prev := p - if autosize != 0 && c.cursym.Name != "runtime.racecallbackthunk" { - q = c.newprog() - q.As = AADD - q.Pos = p.Pos - 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.Link = p.Link - prev.Link = q - prev = q - } - - q1 = c.newprog() - q1.As = ABR - q1.Pos = p.Pos - if retTarget == nil { - q1.To.Type = obj.TYPE_REG - q1.To.Reg = REG_LR - } else { - q1.To.Type = obj.TYPE_BRANCH - q1.To.Sym = retTarget - } - q1.Mark |= BRANCH - q1.Spadj = +autosize - - q1.Link = q.Link - prev.Link = q1 - 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) - } - case AMOVDU: - if p.To.Type == obj.TYPE_MEM && p.To.Reg == REGSP { - p.Spadj = int32(-p.To.Offset) - } - if p.From.Type == obj.TYPE_MEM && p.From.Reg == REGSP { - p.Spadj = int32(-p.From.Offset) - } - case obj.AGETCALLERPC: - if cursym.Leaf() { - /* MOVD LR, Rd */ - p.As = AMOVD - p.From.Type = obj.TYPE_REG - p.From.Reg = REG_LR - } else { - /* MOVD (RSP), Rd */ - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Reg = REGSP - } - } - } -} - -/* -// 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 (c *ctxt9) stacksplit(p *obj.Prog, framesize int32) *obj.Prog { - p0 := p // save entry point, but skipping the two instructions setting R2 in shared mode - - // MOVD g_stackguard(g), R3 - p = obj.Appendp(p, c.newprog) - - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Reg = REGG - p.From.Offset = 2 * int64(c.ctxt.Arch.PtrSize) // G.stackguard0 - if c.cursym.CFunc() { - p.From.Offset = 3 * int64(c.ctxt.Arch.PtrSize) // G.stackguard1 - } - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R3 - - // Mark the stack bound check and morestack call async nonpreemptible. - // If we get preempted here, when resumed the preemption request is - // cleared, but we'll still call morestack, which will double the stack - // unnecessarily. See issue #35470. - p = c.ctxt.StartUnsafePoint(p, c.newprog) - - var q *obj.Prog - if framesize <= objabi.StackSmall { - // small stack: SP < stackguard - // CMP stackguard, SP - p = obj.Appendp(p, c.newprog) - - p.As = ACMPU - p.From.Type = obj.TYPE_REG - p.From.Reg = REG_R3 - p.To.Type = obj.TYPE_REG - p.To.Reg = REGSP - } else if framesize <= objabi.StackBig { - // large stack: SP-framesize < stackguard-StackSmall - // ADD $-(framesize-StackSmall), SP, R4 - // CMP stackguard, R4 - p = obj.Appendp(p, c.newprog) - - p.As = AADD - p.From.Type = obj.TYPE_CONST - p.From.Offset = -(int64(framesize) - objabi.StackSmall) - p.Reg = REGSP - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R4 - - p = obj.Appendp(p, c.newprog) - p.As = ACMPU - p.From.Type = obj.TYPE_REG - p.From.Reg = REG_R3 - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R4 - } 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)), R31 - // CMPU R31, R4 - p = obj.Appendp(p, c.newprog) - - p.As = ACMP - p.From.Type = obj.TYPE_REG - p.From.Reg = REG_R3 - p.To.Type = obj.TYPE_CONST - p.To.Offset = objabi.StackPreempt - - p = obj.Appendp(p, c.newprog) - q = p - p.As = ABEQ - p.To.Type = obj.TYPE_BRANCH - - p = obj.Appendp(p, c.newprog) - p.As = AADD - p.From.Type = obj.TYPE_CONST - p.From.Offset = int64(objabi.StackGuard) - p.Reg = REGSP - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R4 - - p = obj.Appendp(p, c.newprog) - 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(p, c.newprog) - p.As = AMOVD - p.From.Type = obj.TYPE_CONST - p.From.Offset = int64(framesize) + int64(objabi.StackGuard) - objabi.StackSmall - p.To.Type = obj.TYPE_REG - p.To.Reg = REGTMP - - p = obj.Appendp(p, c.newprog) - p.As = ACMPU - p.From.Type = obj.TYPE_REG - p.From.Reg = REGTMP - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R4 - } - - // q1: BLT done - p = obj.Appendp(p, c.newprog) - q1 := p - - p.As = ABLT - p.To.Type = obj.TYPE_BRANCH - - // MOVD LR, R5 - p = obj.Appendp(p, c.newprog) - - 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 q != nil { - q.To.SetTarget(p) - } - - p = c.ctxt.EmitEntryStackMap(c.cursym, p, c.newprog) - - var morestacksym *obj.LSym - if c.cursym.CFunc() { - morestacksym = c.ctxt.Lookup("runtime.morestackc") - } else if !c.cursym.Func.Text.From.Sym.NeedCtxt() { - morestacksym = c.ctxt.Lookup("runtime.morestack_noctxt") - } else { - morestacksym = c.ctxt.Lookup("runtime.morestack") - } - - if c.ctxt.Flag_shared { - // In PPC64 PIC code, R2 is used as TOC pointer derived from R12 - // which is the address of function entry point when entering - // the function. We need to preserve R2 across call to morestack. - // Fortunately, in shared mode, 8(SP) and 16(SP) are reserved in - // the caller's frame, but not used (0(SP) is caller's saved LR, - // 24(SP) is caller's saved R2). Use 8(SP) to save this function's R2. - - // MOVD R12, 8(SP) - p = obj.Appendp(p, c.newprog) - p.As = AMOVD - p.From.Type = obj.TYPE_REG - p.From.Reg = REG_R2 - p.To.Type = obj.TYPE_MEM - p.To.Reg = REGSP - p.To.Offset = 8 - } - - if c.ctxt.Flag_dynlink { - // Avoid calling morestack via a PLT when dynamically linking. The - // PLT stubs generated by the system linker on ppc64le when "std r2, - // 24(r1)" to save the TOC pointer in their callers stack - // frame. Unfortunately (and necessarily) morestack is called before - // the function that calls it sets up its frame and so the PLT ends - // up smashing the saved TOC pointer for its caller's caller. - // - // According to the ABI documentation there is a mechanism to avoid - // the TOC save that the PLT stub does (put a R_PPC64_TOCSAVE - // relocation on the nop after the call to morestack) but at the time - // of writing it is not supported at all by gold and my attempt to - // use it with ld.bfd caused an internal linker error. So this hack - // seems preferable. - - // MOVD $runtime.morestack(SB), R12 - p = obj.Appendp(p, c.newprog) - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Sym = morestacksym - p.From.Name = obj.NAME_GOTREF - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R12 - - // MOVD R12, LR - p = obj.Appendp(p, c.newprog) - p.As = AMOVD - p.From.Type = obj.TYPE_REG - p.From.Reg = REG_R12 - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_LR - - // BL LR - p = obj.Appendp(p, c.newprog) - p.As = obj.ACALL - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_LR - } else { - // BL runtime.morestack(SB) - p = obj.Appendp(p, c.newprog) - - p.As = ABL - p.To.Type = obj.TYPE_BRANCH - p.To.Sym = morestacksym - } - - if c.ctxt.Flag_shared { - // MOVD 8(SP), R2 - p = obj.Appendp(p, c.newprog) - p.As = AMOVD - p.From.Type = obj.TYPE_MEM - p.From.Reg = REGSP - p.From.Offset = 8 - p.To.Type = obj.TYPE_REG - p.To.Reg = REG_R2 - } - - p = c.ctxt.EndUnsafePoint(p, c.newprog, -1) - - // BR start - p = obj.Appendp(p, c.newprog) - p.As = ABR - p.To.Type = obj.TYPE_BRANCH - p.To.SetTarget(p0.Link) - - // placeholder for q1's jump target - p = obj.Appendp(p, c.newprog) - - p.As = obj.ANOP // zero-width place holder - q1.To.SetTarget(p) - - return p -} - -var Linkppc64 = obj.LinkArch{ - Arch: sys.ArchPPC64, - Init: buildop, - Preprocess: preprocess, - Assemble: span9, - Progedit: progedit, - DWARFRegisters: PPC64DWARFRegisters, -} - -var Linkppc64le = obj.LinkArch{ - Arch: sys.ArchPPC64LE, - Init: buildop, - Preprocess: preprocess, - Assemble: span9, - Progedit: progedit, - DWARFRegisters: PPC64DWARFRegisters, -} |