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cmd/internal/obj/mips: add support for GOARCH=mips{,le}
Implements subset of MIPS32(r1) instruction set. Change-Id: Iba017350f6c2763de05d4d1bc2f123e8eb76d0ff Reviewed-on: https://go-review.googlesource.com/31475 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Vladimir Stefanovic
Brad Fitzpatrick
parent
c41137d242
commit
5d28bc58b6
8 changed files with 553 additions and 321 deletions
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@ -37,6 +37,18 @@ import (
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)
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func progedit(ctxt *obj.Link, p *obj.Prog) {
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// Maintain information about code generation mode.
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if ctxt.Mode == 0 {
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switch ctxt.Arch.Family {
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default:
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ctxt.Diag("unsupported arch family")
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case sys.MIPS:
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ctxt.Mode = Mips32
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case sys.MIPS64:
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ctxt.Mode = Mips64
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}
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}
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p.From.Class = 0
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p.To.Class = 0
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@ -59,7 +71,7 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
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f32 := float32(p.From.Val.(float64))
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i32 := math.Float32bits(f32)
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if i32 == 0 {
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p.As = AMOVV
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p.As = AMOVW
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGZERO
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break
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@ -76,7 +88,7 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
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case AMOVD:
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if p.From.Type == obj.TYPE_FCONST {
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i64 := math.Float64bits(p.From.Val.(float64))
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if i64 == 0 {
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if i64 == 0 && ctxt.Mode&Mips64 != 0 {
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p.As = AMOVV
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGZERO
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@ -271,6 +283,15 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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}
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}
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var mov, add obj.As
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if ctxt.Mode&Mips64 != 0 {
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add = AADDV
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mov = AMOVV
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} else {
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add = AADDU
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mov = AMOVW
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}
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autosize := int32(0)
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var p1 *obj.Prog
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var p2 *obj.Prog
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@ -278,13 +299,14 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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o := p.As
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switch o {
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case obj.ATEXT:
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autosize = int32(textstksiz + 8)
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if (p.Mark&LEAF != 0) && autosize <= 8 {
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autosize = int32(textstksiz + ctxt.FixedFrameSize())
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if (p.Mark&LEAF != 0) && autosize <= int32(ctxt.FixedFrameSize()) {
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autosize = 0
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} else if autosize&4 != 0 {
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} else if autosize&4 != 0 && ctxt.Mode&Mips64 != 0 {
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autosize += 4
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}
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p.To.Offset = int64(autosize) - 8
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p.To.Offset = int64(autosize) - ctxt.FixedFrameSize()
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if p.From3.Offset&obj.NOSPLIT == 0 {
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p = stacksplit(ctxt, p, autosize) // emit split check
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@ -299,7 +321,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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// during the execution of the function prologue, the traceback
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// code will not see a half-updated stack frame.
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q = obj.Appendp(ctxt, q)
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q.As = AMOVV
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q.As = mov
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q.Lineno = p.Lineno
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q.From.Type = obj.TYPE_REG
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q.From.Reg = REGLINK
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@ -308,7 +330,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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q.To.Reg = REGSP
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q = obj.Appendp(ctxt, q)
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q.As = AADDV
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q.As = add
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q.Lineno = p.Lineno
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = int64(-autosize)
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@ -333,13 +355,13 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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if cursym.Text.From3.Offset&obj.WRAPPER != 0 {
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// if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame
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//
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// MOVV g_panic(g), R1
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// BEQ R1, end
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// MOVV panic_argp(R1), R2
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// ADDV $(autosize+8), R29, R3
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// BNE R2, R3, end
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// ADDV $8, R29, R2
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// MOVV R2, panic_argp(R1)
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// MOV g_panic(g), R1
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// BEQ R1, end
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// MOV panic_argp(R1), R2
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// ADD $(autosize+FIXED_FRAME), R29, R3
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// BNE R2, R3, end
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// ADD $FIXED_FRAME, R29, R2
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// MOV R2, panic_argp(R1)
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// end:
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// NOP
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//
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@ -348,7 +370,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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q = obj.Appendp(ctxt, q)
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q.As = AMOVV
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q.As = mov
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q.From.Type = obj.TYPE_MEM
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q.From.Reg = REGG
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q.From.Offset = 4 * int64(ctxt.Arch.PtrSize) // G.panic
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@ -364,7 +386,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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p1 = q
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q = obj.Appendp(ctxt, q)
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q.As = AMOVV
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q.As = mov
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q.From.Type = obj.TYPE_MEM
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q.From.Reg = REG_R1
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q.From.Offset = 0 // Panic.argp
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@ -372,9 +394,9 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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q.To.Reg = REG_R2
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q = obj.Appendp(ctxt, q)
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q.As = AADDV
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q.As = add
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = int64(autosize) + 8
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q.From.Offset = int64(autosize) + ctxt.FixedFrameSize()
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q.Reg = REGSP
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q.To.Type = obj.TYPE_REG
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q.To.Reg = REG_R3
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@ -389,15 +411,15 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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p2 = q
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q = obj.Appendp(ctxt, q)
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q.As = AADDV
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q.As = add
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = 8
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q.From.Offset = ctxt.FixedFrameSize()
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q.Reg = REGSP
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q.To.Type = obj.TYPE_REG
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q.To.Reg = REG_R2
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q = obj.Appendp(ctxt, q)
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q.As = AMOVV
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q.As = mov
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q.From.Type = obj.TYPE_REG
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q.From.Reg = REG_R2
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q.To.Type = obj.TYPE_MEM
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@ -438,7 +460,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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break
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}
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p.As = AADDV
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p.As = add
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(autosize)
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p.To.Type = obj.TYPE_REG
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@ -459,7 +481,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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break
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}
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p.As = AMOVV
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p.As = mov
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p.From.Type = obj.TYPE_MEM
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p.From.Offset = 0
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p.From.Reg = REGSP
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@ -471,7 +493,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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if autosize != 0 {
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q = ctxt.NewProg()
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q.As = AADDV
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q.As = add
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q.Lineno = p.Lineno
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q.From.Type = obj.TYPE_CONST
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q.From.Offset = int64(autosize)
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@ -501,7 +523,9 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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q1.Link = q.Link
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q.Link = q1
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case AADDV,
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case AADD,
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AADDU,
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AADDV,
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AADDVU:
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if p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP && p.From.Type == obj.TYPE_CONST {
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p.Spadj = int32(-p.From.Offset)
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@ -564,10 +588,27 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
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}
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func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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// MOVV g_stackguard(g), R1
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// Leaf function with no frame is effectively NOSPLIT.
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if framesize == 0 {
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return p
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}
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var mov, add, sub obj.As
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if ctxt.Mode&Mips64 != 0 {
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add = AADDV
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mov = AMOVV
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sub = ASUBVU
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} else {
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add = AADDU
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mov = AMOVW
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sub = ASUBU
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}
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// MOV g_stackguard(g), R1
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p = obj.Appendp(ctxt, p)
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p.As = AMOVV
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p.As = mov
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p.From.Type = obj.TYPE_MEM
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p.From.Reg = REGG
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p.From.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0
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@ -591,11 +632,11 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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p.To.Reg = REG_R1
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} else if framesize <= obj.StackBig {
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// large stack: SP-framesize < stackguard-StackSmall
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// ADDV $-framesize, SP, R2
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// ADD $-framesize, SP, R2
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// SGTU R2, stackguard, R1
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p = obj.Appendp(ctxt, p)
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p.As = AADDV
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p.As = add
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(-framesize)
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p.Reg = REGSP
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@ -619,15 +660,15 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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// Preemption sets stackguard to StackPreempt, a very large value.
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// That breaks the math above, so we have to check for that explicitly.
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// // stackguard is R1
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// MOVV $StackPreempt, R2
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// MOV $StackPreempt, R2
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// BEQ R1, R2, label-of-call-to-morestack
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// ADDV $StackGuard, SP, R2
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// SUBVU R1, R2
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// MOVV $(framesize+(StackGuard-StackSmall)), R1
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// ADD $StackGuard, SP, R2
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// SUB R1, R2
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// MOV $(framesize+(StackGuard-StackSmall)), R1
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// SGTU R2, R1, R1
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p = obj.Appendp(ctxt, p)
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p.As = AMOVV
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p.As = mov
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = obj.StackPreempt
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p.To.Type = obj.TYPE_REG
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@ -643,7 +684,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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p.Mark |= BRANCH
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p = obj.Appendp(ctxt, p)
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p.As = AADDV
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p.As = add
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = obj.StackGuard
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p.Reg = REGSP
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@ -651,14 +692,14 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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p.To.Reg = REG_R2
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p = obj.Appendp(ctxt, p)
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p.As = ASUBVU
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p.As = sub
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REG_R1
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p.To.Type = obj.TYPE_REG
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p.To.Reg = REG_R2
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p = obj.Appendp(ctxt, p)
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p.As = AMOVV
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p.As = mov
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(framesize) + obj.StackGuard - obj.StackSmall
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p.To.Type = obj.TYPE_REG
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@ -683,10 +724,10 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
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p.To.Type = obj.TYPE_BRANCH
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p.Mark |= BRANCH
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// MOVV LINK, R3
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// MOV LINK, R3
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p = obj.Appendp(ctxt, p)
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p.As = AMOVV
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p.As = mov
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p.From.Type = obj.TYPE_REG
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p.From.Reg = REGLINK
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p.To.Type = obj.TYPE_REG
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@ -1494,3 +1535,19 @@ var Linkmips64le = obj.LinkArch{
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Follow: follow,
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Progedit: progedit,
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}
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var Linkmips = obj.LinkArch{
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Arch: sys.ArchMIPS,
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Preprocess: preprocess,
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Assemble: span0,
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Follow: follow,
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Progedit: progedit,
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}
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var Linkmipsle = obj.LinkArch{
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Arch: sys.ArchMIPSLE,
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Preprocess: preprocess,
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Assemble: span0,
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Follow: follow,
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Progedit: progedit,
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}
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