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Source file src/cmd/link/internal/mips/asm.go

Documentation: cmd/link/internal/mips

  // Inferno utils/5l/asm.c
  // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/5l/asm.c
  //
  //	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 © 2000-2007 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 © 2000-2007 Lucent Technologies Inc. and others
  //	Portions Copyright © 2016 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 mips
  
  import (
  	"cmd/internal/objabi"
  	"cmd/link/internal/ld"
  	"fmt"
  	"log"
  )
  
  func gentext(ctxt *ld.Link) {
  	return
  }
  
  func adddynrel(ctxt *ld.Link, s *ld.Symbol, r *ld.Reloc) bool {
  	log.Fatalf("adddynrel not implemented")
  	return false
  }
  
  func elfreloc1(ctxt *ld.Link, r *ld.Reloc, sectoff int64) int {
  	ld.Thearch.Lput(uint32(sectoff))
  
  	elfsym := r.Xsym.ElfsymForReloc()
  	switch r.Type {
  	default:
  		return -1
  
  	case objabi.R_ADDR:
  		if r.Siz != 4 {
  			return -1
  		}
  		ld.Thearch.Lput(ld.R_MIPS_32 | uint32(elfsym)<<8)
  
  	case objabi.R_ADDRMIPS:
  		ld.Thearch.Lput(ld.R_MIPS_LO16 | uint32(elfsym)<<8)
  
  	case objabi.R_ADDRMIPSU:
  		ld.Thearch.Lput(ld.R_MIPS_HI16 | uint32(elfsym)<<8)
  
  	case objabi.R_ADDRMIPSTLS:
  		ld.Thearch.Lput(ld.R_MIPS_TLS_TPREL_LO16 | uint32(elfsym)<<8)
  
  	case objabi.R_CALLMIPS, objabi.R_JMPMIPS:
  		ld.Thearch.Lput(ld.R_MIPS_26 | uint32(elfsym)<<8)
  	}
  
  	return 0
  }
  
  func elfsetupplt(ctxt *ld.Link) {
  	return
  }
  
  func machoreloc1(s *ld.Symbol, r *ld.Reloc, sectoff int64) int {
  	return -1
  }
  
  func applyrel(r *ld.Reloc, s *ld.Symbol, val *int64, t int64) {
  	o := ld.SysArch.ByteOrder.Uint32(s.P[r.Off:])
  	switch r.Type {
  	case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSTLS:
  		*val = int64(o&0xffff0000 | uint32(t)&0xffff)
  	case objabi.R_ADDRMIPSU:
  		*val = int64(o&0xffff0000 | uint32((t+(1<<15))>>16)&0xffff)
  	case objabi.R_CALLMIPS, objabi.R_JMPMIPS:
  		*val = int64(o&0xfc000000 | uint32(t>>2)&^0xfc000000)
  	}
  }
  
  func archreloc(ctxt *ld.Link, r *ld.Reloc, s *ld.Symbol, val *int64) int {
  	if ld.Linkmode == ld.LinkExternal {
  		switch r.Type {
  		default:
  			return -1
  
  		case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU:
  
  			r.Done = 0
  
  			// set up addend for eventual relocation via outer symbol.
  			rs := r.Sym
  			r.Xadd = r.Add
  			for rs.Outer != nil {
  				r.Xadd += ld.Symaddr(rs) - ld.Symaddr(rs.Outer)
  				rs = rs.Outer
  			}
  
  			if rs.Type != ld.SHOSTOBJ && rs.Type != ld.SDYNIMPORT && rs.Sect == nil {
  				ld.Errorf(s, "missing section for %s", rs.Name)
  			}
  			r.Xsym = rs
  			applyrel(r, s, val, r.Xadd)
  			return 0
  
  		case objabi.R_ADDRMIPSTLS, objabi.R_CALLMIPS, objabi.R_JMPMIPS:
  			r.Done = 0
  			r.Xsym = r.Sym
  			r.Xadd = r.Add
  			applyrel(r, s, val, r.Add)
  			return 0
  		}
  	}
  
  	switch r.Type {
  	case objabi.R_CONST:
  		*val = r.Add
  		return 0
  
  	case objabi.R_GOTOFF:
  		*val = ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(ctxt.Syms.Lookup(".got", 0))
  		return 0
  
  	case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU:
  		t := ld.Symaddr(r.Sym) + r.Add
  		applyrel(r, s, val, t)
  		return 0
  
  	case objabi.R_CALLMIPS, objabi.R_JMPMIPS:
  		t := ld.Symaddr(r.Sym) + r.Add
  
  		if t&3 != 0 {
  			ld.Errorf(s, "direct call is not aligned: %s %x", r.Sym.Name, t)
  		}
  
  		// check if target address is in the same 256 MB region as the next instruction
  		if (s.Value+int64(r.Off)+4)&0xf0000000 != (t & 0xf0000000) {
  			ld.Errorf(s, "direct call too far: %s %x", r.Sym.Name, t)
  		}
  
  		applyrel(r, s, val, t)
  		return 0
  
  	case objabi.R_ADDRMIPSTLS:
  		// thread pointer is at 0x7000 offset from the start of TLS data area
  		t := ld.Symaddr(r.Sym) + r.Add - 0x7000
  		if t < -32768 || t >= 32678 {
  			ld.Errorf(s, "TLS offset out of range %d", t)
  		}
  		applyrel(r, s, val, t)
  		return 0
  	}
  
  	return -1
  }
  
  func archrelocvariant(ctxt *ld.Link, r *ld.Reloc, s *ld.Symbol, t int64) int64 {
  	return -1
  }
  
  func asmb(ctxt *ld.Link) {
  	if ctxt.Debugvlog != 0 {
  		ctxt.Logf("%5.2f asmb\n", ld.Cputime())
  	}
  
  	if ld.Iself {
  		ld.Asmbelfsetup()
  	}
  
  	sect := ld.Segtext.Sections[0]
  	ld.Cseek(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
  	ld.Codeblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
  	for _, sect = range ld.Segtext.Sections[1:] {
  		ld.Cseek(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
  		ld.Datblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
  	}
  
  	if ld.Segrodata.Filelen > 0 {
  		if ctxt.Debugvlog != 0 {
  			ctxt.Logf("%5.2f rodatblk\n", ld.Cputime())
  		}
  
  		ld.Cseek(int64(ld.Segrodata.Fileoff))
  		ld.Datblk(ctxt, int64(ld.Segrodata.Vaddr), int64(ld.Segrodata.Filelen))
  	}
  
  	if ctxt.Debugvlog != 0 {
  		ctxt.Logf("%5.2f datblk\n", ld.Cputime())
  	}
  
  	ld.Cseek(int64(ld.Segdata.Fileoff))
  	ld.Datblk(ctxt, int64(ld.Segdata.Vaddr), int64(ld.Segdata.Filelen))
  
  	ld.Cseek(int64(ld.Segdwarf.Fileoff))
  	ld.Dwarfblk(ctxt, int64(ld.Segdwarf.Vaddr), int64(ld.Segdwarf.Filelen))
  
  	/* output symbol table */
  	ld.Symsize = 0
  
  	ld.Lcsize = 0
  	symo := uint32(0)
  	if !*ld.FlagS {
  		if !ld.Iself {
  			ld.Errorf(nil, "unsupported executable format")
  		}
  		if ctxt.Debugvlog != 0 {
  			ctxt.Logf("%5.2f sym\n", ld.Cputime())
  		}
  		symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
  		symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
  
  		ld.Cseek(int64(symo))
  		if ctxt.Debugvlog != 0 {
  			ctxt.Logf("%5.2f elfsym\n", ld.Cputime())
  		}
  		ld.Asmelfsym(ctxt)
  		ld.Cflush()
  		ld.Cwrite(ld.Elfstrdat)
  
  		if ctxt.Debugvlog != 0 {
  			ctxt.Logf("%5.2f dwarf\n", ld.Cputime())
  		}
  
  		if ld.Linkmode == ld.LinkExternal {
  			ld.Elfemitreloc(ctxt)
  		}
  	}
  
  	if ctxt.Debugvlog != 0 {
  		ctxt.Logf("%5.2f header\n", ld.Cputime())
  	}
  
  	ld.Cseek(0)
  	switch ld.Headtype {
  	default:
  		ld.Errorf(nil, "unsupported operating system")
  	case objabi.Hlinux:
  		ld.Asmbelf(ctxt, int64(symo))
  	}
  
  	ld.Cflush()
  	if *ld.FlagC {
  		fmt.Printf("textsize=%d\n", ld.Segtext.Filelen)
  		fmt.Printf("datsize=%d\n", ld.Segdata.Filelen)
  		fmt.Printf("bsssize=%d\n", ld.Segdata.Length-ld.Segdata.Filelen)
  		fmt.Printf("symsize=%d\n", ld.Symsize)
  		fmt.Printf("lcsize=%d\n", ld.Lcsize)
  		fmt.Printf("total=%d\n", ld.Segtext.Filelen+ld.Segdata.Length+uint64(ld.Symsize)+uint64(ld.Lcsize))
  	}
  }
  

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