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cmd/internal/obj/riscv: absorb rewriteMOV into instruction generation
Replace the now poorly named rewriteMOV function with a markRelocs function, absorbing the MOV validation into the instruction generation code. Change-Id: I6ae94553f7f300862c40310343ef0be8f44a4b0f Reviewed-on: https://go-review.googlesource.com/c/go/+/344459 Trust: Joel Sing <joel@sing.id.au> Reviewed-by: Cherry Mui <cherryyz@google.com>
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Joel Sing
parent
f5bdbf311c
commit
da790cccc5
@ -218,64 +218,28 @@ func movToStore(mnemonic obj.As) obj.As {
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}
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}
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// rewriteMOV rewrites MOV pseudo-instructions.
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func rewriteMOV(ctxt *obj.Link, newprog obj.ProgAlloc, p *obj.Prog) {
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// markRelocs marks an obj.Prog that specifies a MOV pseudo-instruction and
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// requires relocation.
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func markRelocs(p *obj.Prog) {
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switch p.As {
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case AMOV, AMOVB, AMOVH, AMOVW, AMOVBU, AMOVHU, AMOVWU, AMOVF, AMOVD:
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default:
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panic(fmt.Sprintf("%+v is not a MOV pseudo-instruction", p.As))
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}
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switch {
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case p.From.Type == obj.TYPE_REG && p.To.Type == obj.TYPE_REG:
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case p.From.Type == obj.TYPE_MEM && p.To.Type == obj.TYPE_REG:
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switch p.From.Name {
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case obj.NAME_AUTO, obj.NAME_NONE, obj.NAME_PARAM:
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case obj.NAME_EXTERN, obj.NAME_STATIC:
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p.Mark |= NEED_PCREL_ITYPE_RELOC
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default:
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ctxt.Diag("unsupported name %d for %v", p.From.Name, p)
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switch {
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case p.From.Type == obj.TYPE_ADDR && p.To.Type == obj.TYPE_REG:
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switch p.From.Name {
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case obj.NAME_EXTERN, obj.NAME_STATIC:
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p.Mark |= NEED_PCREL_ITYPE_RELOC
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}
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case p.From.Type == obj.TYPE_MEM && p.To.Type == obj.TYPE_REG:
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switch p.From.Name {
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case obj.NAME_EXTERN, obj.NAME_STATIC:
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p.Mark |= NEED_PCREL_ITYPE_RELOC
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}
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case p.From.Type == obj.TYPE_REG && p.To.Type == obj.TYPE_MEM:
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switch p.To.Name {
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case obj.NAME_EXTERN, obj.NAME_STATIC:
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p.Mark |= NEED_PCREL_STYPE_RELOC
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}
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}
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case p.From.Type == obj.TYPE_REG && p.To.Type == obj.TYPE_MEM:
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switch p.As {
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case AMOVBU, AMOVHU, AMOVWU:
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ctxt.Diag("unsupported unsigned store at %v", p)
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}
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switch p.To.Name {
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case obj.NAME_AUTO, obj.NAME_NONE, obj.NAME_PARAM:
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case obj.NAME_EXTERN, obj.NAME_STATIC:
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p.Mark |= NEED_PCREL_STYPE_RELOC
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default:
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ctxt.Diag("unsupported name %d for %v", p.From.Name, p)
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}
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case p.From.Type == obj.TYPE_CONST:
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if p.As != AMOV {
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ctxt.Diag("%v: unsupported constant load", p)
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}
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if p.To.Type != obj.TYPE_REG {
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ctxt.Diag("%v: constant load must target register", p)
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}
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case p.From.Type == obj.TYPE_ADDR:
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if p.As != AMOV {
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ctxt.Diag("%v: unsupported address load", p)
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}
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if p.To.Type != obj.TYPE_REG {
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ctxt.Diag("%v: address load must target register", p)
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}
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switch p.From.Name {
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case obj.NAME_AUTO, obj.NAME_NONE, obj.NAME_PARAM:
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case obj.NAME_EXTERN, obj.NAME_STATIC:
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p.Mark |= NEED_PCREL_ITYPE_RELOC
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default:
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ctxt.Diag("unsupported name %d for %v", p.From.Name, p)
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}
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default:
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ctxt.Diag("unsupported MOV at %v", p)
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}
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}
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@ -641,14 +605,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
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}
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}
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// Rewrite MOV pseudo-instructions. This cannot be done in
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// progedit, as SP offsets need to be applied before we split
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// up some of the Addrs.
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for p := cursym.Func().Text; p != nil; p = p.Link {
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switch p.As {
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case AMOV, AMOVB, AMOVH, AMOVW, AMOVBU, AMOVHU, AMOVWU, AMOVF, AMOVD:
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rewriteMOV(ctxt, newprog, p)
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}
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markRelocs(p)
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}
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// Compute instruction addresses. Once we do that, we need to check for
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@ -1746,6 +1704,11 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
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switch {
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case p.From.Type == obj.TYPE_CONST && p.To.Type == obj.TYPE_REG:
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// Handle constant to register moves.
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if p.As != AMOV {
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p.Ctxt.Diag("%v: unsupported constant load", p)
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return nil
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}
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low, high, err := Split32BitImmediate(ins.imm)
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if err != nil {
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p.Ctxt.Diag("%v: constant %d too large: %v", p, ins.imm, err)
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@ -1769,6 +1732,10 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
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inss = append(inss, ins)
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}
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case p.From.Type == obj.TYPE_CONST && p.To.Type != obj.TYPE_REG:
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p.Ctxt.Diag("%v: constant load must target register", p)
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return nil
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case p.From.Type == obj.TYPE_REG && p.To.Type == obj.TYPE_REG:
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// Handle register to register moves.
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switch p.As {
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@ -1820,13 +1787,17 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
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insAUIPC := &instruction{as: AAUIPC, rd: ins.rd}
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ins.as, ins.rs1, ins.rs2, ins.imm = movToLoad(p.As), ins.rd, obj.REG_NONE, 0
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inss = []*instruction{insAUIPC, ins}
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default:
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p.Ctxt.Diag("unsupported name %d for %v", p.From.Name, p)
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return nil
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}
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case p.From.Type == obj.TYPE_REG && p.To.Type == obj.TYPE_MEM:
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// Register to memory stores.
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switch p.As {
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case AMOVBU, AMOVHU, AMOVWU:
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// rewriteMOV should have already added an error for these.
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p.Ctxt.Diag("%v: unsupported unsigned store", p)
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return nil
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}
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switch p.To.Name {
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@ -1843,11 +1814,18 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
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insAUIPC := &instruction{as: AAUIPC, rd: REG_TMP}
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ins.as, ins.rd, ins.rs1, ins.rs2, ins.imm = movToStore(p.As), REG_TMP, uint32(p.From.Reg), obj.REG_NONE, 0
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inss = []*instruction{insAUIPC, ins}
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default:
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p.Ctxt.Diag("unsupported name %d for %v", p.From.Name, p)
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return nil
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}
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case p.From.Type == obj.TYPE_ADDR && p.To.Type == obj.TYPE_REG:
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// MOV $sym+off(SP/SB), R
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if p.As != AMOV {
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p.Ctxt.Diag("%v: unsupported address load", p)
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return nil
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}
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switch p.From.Name {
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case obj.NAME_AUTO, obj.NAME_PARAM, obj.NAME_NONE:
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inss = instructionsForOpImmediate(p, AADDI, addrToReg(p.From))
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@ -1861,15 +1839,19 @@ func instructionsForMOV(p *obj.Prog) []*instruction {
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insAUIPC := &instruction{as: AAUIPC, rd: ins.rd}
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ins.as, ins.rs1, ins.rs2, ins.imm = AADDI, ins.rd, obj.REG_NONE, 0
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inss = []*instruction{insAUIPC, ins}
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}
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default:
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// If we get here with a MOV pseudo-instruction it is going to
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// remain unhandled. For now we trust rewriteMOV to catch these.
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switch p.As {
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case AMOV, AMOVB, AMOVH, AMOVW, AMOVBU, AMOVHU, AMOVWU, AMOVF, AMOVD:
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default:
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p.Ctxt.Diag("unsupported name %d for %v", p.From.Name, p)
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return nil
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}
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case p.From.Type == obj.TYPE_ADDR && p.To.Type != obj.TYPE_REG:
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p.Ctxt.Diag("%v: address load must target register", p)
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return nil
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default:
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p.Ctxt.Diag("%v: unsupported MOV", p)
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return nil
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}
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return inss
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