| // 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/internal/sys" |
| "cmd/link/internal/ld" |
| "cmd/link/internal/sym" |
| "debug/elf" |
| "fmt" |
| "log" |
| ) |
| |
| func gentext(ctxt *ld.Link) { |
| return |
| } |
| |
| func adddynrel(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc) bool { |
| log.Fatalf("adddynrel not implemented") |
| return false |
| } |
| |
| func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool { |
| ctxt.Out.Write32(uint32(sectoff)) |
| |
| elfsym := r.Xsym.ElfsymForReloc() |
| switch r.Type { |
| default: |
| return false |
| case objabi.R_ADDR: |
| if r.Siz != 4 { |
| return false |
| } |
| ctxt.Out.Write32(uint32(elf.R_MIPS_32) | uint32(elfsym)<<8) |
| case objabi.R_ADDRMIPS: |
| ctxt.Out.Write32(uint32(elf.R_MIPS_LO16) | uint32(elfsym)<<8) |
| case objabi.R_ADDRMIPSU: |
| ctxt.Out.Write32(uint32(elf.R_MIPS_HI16) | uint32(elfsym)<<8) |
| case objabi.R_ADDRMIPSTLS: |
| ctxt.Out.Write32(uint32(elf.R_MIPS_TLS_TPREL_LO16) | uint32(elfsym)<<8) |
| case objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| ctxt.Out.Write32(uint32(elf.R_MIPS_26) | uint32(elfsym)<<8) |
| } |
| |
| return true |
| } |
| |
| func elfsetupplt(ctxt *ld.Link) { |
| return |
| } |
| |
| func machoreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool { |
| return false |
| } |
| |
| func applyrel(arch *sys.Arch, r *sym.Reloc, s *sym.Symbol, val int64, t int64) int64 { |
| o := arch.ByteOrder.Uint32(s.P[r.Off:]) |
| switch r.Type { |
| case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSTLS: |
| return int64(o&0xffff0000 | uint32(t)&0xffff) |
| case objabi.R_ADDRMIPSU: |
| return int64(o&0xffff0000 | uint32((t+(1<<15))>>16)&0xffff) |
| case objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| return int64(o&0xfc000000 | uint32(t>>2)&^0xfc000000) |
| default: |
| return val |
| } |
| } |
| |
| func archreloc(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, val int64) (int64, bool) { |
| if ctxt.LinkMode == ld.LinkExternal { |
| switch r.Type { |
| default: |
| return val, false |
| case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU: |
| r.Done = false |
| |
| // 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 != sym.SHOSTOBJ && rs.Type != sym.SDYNIMPORT && rs.Sect == nil { |
| ld.Errorf(s, "missing section for %s", rs.Name) |
| } |
| r.Xsym = rs |
| return applyrel(ctxt.Arch, r, s, val, r.Xadd), true |
| case objabi.R_ADDRMIPSTLS, objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| r.Done = false |
| r.Xsym = r.Sym |
| r.Xadd = r.Add |
| return applyrel(ctxt.Arch, r, s, val, r.Add), true |
| } |
| } |
| |
| switch r.Type { |
| case objabi.R_CONST: |
| return r.Add, true |
| case objabi.R_GOTOFF: |
| return ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(ctxt.Syms.Lookup(".got", 0)), true |
| case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU: |
| t := ld.Symaddr(r.Sym) + r.Add |
| return applyrel(ctxt.Arch, r, s, val, t), true |
| 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) |
| } |
| |
| return applyrel(ctxt.Arch, r, s, val, t), true |
| 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) |
| } |
| return applyrel(ctxt.Arch, r, s, val, t), true |
| } |
| |
| return val, false |
| } |
| |
| func archrelocvariant(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, t int64) int64 { |
| return -1 |
| } |
| |
| func asmb(ctxt *ld.Link) { |
| if ctxt.IsELF { |
| ld.Asmbelfsetup() |
| } |
| |
| sect := ld.Segtext.Sections[0] |
| ctxt.Out.SeekSet(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:] { |
| ctxt.Out.SeekSet(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff)) |
| ld.Datblk(ctxt, int64(sect.Vaddr), int64(sect.Length)) |
| } |
| |
| if ld.Segrodata.Filelen > 0 { |
| ctxt.Out.SeekSet(int64(ld.Segrodata.Fileoff)) |
| ld.Datblk(ctxt, int64(ld.Segrodata.Vaddr), int64(ld.Segrodata.Filelen)) |
| } |
| |
| ctxt.Out.SeekSet(int64(ld.Segdata.Fileoff)) |
| ld.Datblk(ctxt, int64(ld.Segdata.Vaddr), int64(ld.Segdata.Filelen)) |
| |
| ctxt.Out.SeekSet(int64(ld.Segdwarf.Fileoff)) |
| ld.Dwarfblk(ctxt, int64(ld.Segdwarf.Vaddr), int64(ld.Segdwarf.Filelen)) |
| } |
| |
| func asmb2(ctxt *ld.Link) { |
| /* output symbol table */ |
| ld.Symsize = 0 |
| |
| ld.Lcsize = 0 |
| symo := uint32(0) |
| if !*ld.FlagS { |
| if !ctxt.IsELF { |
| ld.Errorf(nil, "unsupported executable format") |
| } |
| symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen) |
| symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound))) |
| |
| ctxt.Out.SeekSet(int64(symo)) |
| ld.Asmelfsym(ctxt) |
| ctxt.Out.Flush() |
| ctxt.Out.Write(ld.Elfstrdat) |
| |
| if ctxt.LinkMode == ld.LinkExternal { |
| ld.Elfemitreloc(ctxt) |
| } |
| } |
| |
| ctxt.Out.SeekSet(0) |
| switch ctxt.HeadType { |
| default: |
| ld.Errorf(nil, "unsupported operating system") |
| case objabi.Hlinux: |
| ld.Asmbelf(ctxt, int64(symo)) |
| } |
| |
| ctxt.Out.Flush() |
| 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)) |
| } |
| } |
