| // Inferno utils/5l/asm.c |
| // https://bitbucket.org/inferno-os/inferno-os/src/master/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/loader" |
| "cmd/link/internal/sym" |
| "debug/elf" |
| ) |
| |
| func gentext(ctxt *ld.Link, ldr *loader.Loader) { |
| return |
| } |
| |
| func elfreloc1(ctxt *ld.Link, out *ld.OutBuf, ldr *loader.Loader, s loader.Sym, r loader.ExtReloc, ri int, sectoff int64) bool { |
| out.Write32(uint32(sectoff)) |
| |
| elfsym := ld.ElfSymForReloc(ctxt, r.Xsym) |
| switch r.Type { |
| default: |
| return false |
| case objabi.R_ADDR, objabi.R_DWARFSECREF: |
| if r.Size != 4 { |
| return false |
| } |
| out.Write32(uint32(elf.R_MIPS_32) | uint32(elfsym)<<8) |
| case objabi.R_ADDRMIPS: |
| out.Write32(uint32(elf.R_MIPS_LO16) | uint32(elfsym)<<8) |
| case objabi.R_ADDRMIPSU: |
| out.Write32(uint32(elf.R_MIPS_HI16) | uint32(elfsym)<<8) |
| case objabi.R_ADDRMIPSTLS: |
| out.Write32(uint32(elf.R_MIPS_TLS_TPREL_LO16) | uint32(elfsym)<<8) |
| case objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| out.Write32(uint32(elf.R_MIPS_26) | uint32(elfsym)<<8) |
| } |
| |
| return true |
| } |
| |
| func elfsetupplt(ctxt *ld.Link, ldr *loader.Loader, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym) { |
| return |
| } |
| |
| func machoreloc1(*sys.Arch, *ld.OutBuf, *loader.Loader, loader.Sym, loader.ExtReloc, int64) bool { |
| return false |
| } |
| |
| func applyrel(arch *sys.Arch, ldr *loader.Loader, rt objabi.RelocType, off int32, s loader.Sym, val int64, t int64) int64 { |
| o := uint32(val) |
| switch rt { |
| 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(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loader.Reloc, s loader.Sym, val int64) (o int64, nExtReloc int, ok bool) { |
| rs := r.Sym() |
| if target.IsExternal() { |
| switch r.Type() { |
| default: |
| return val, 0, false |
| |
| case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU: |
| // set up addend for eventual relocation via outer symbol. |
| _, off := ld.FoldSubSymbolOffset(ldr, rs) |
| xadd := r.Add() + off |
| return applyrel(target.Arch, ldr, r.Type(), r.Off(), s, val, xadd), 1, true |
| |
| case objabi.R_ADDRMIPSTLS, objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| return applyrel(target.Arch, ldr, r.Type(), r.Off(), s, val, r.Add()), 1, true |
| } |
| } |
| |
| const isOk = true |
| const noExtReloc = 0 |
| switch rt := r.Type(); rt { |
| case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU: |
| t := ldr.SymValue(rs) + r.Add() |
| return applyrel(target.Arch, ldr, rt, r.Off(), s, val, t), noExtReloc, isOk |
| case objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| t := ldr.SymValue(rs) + r.Add() |
| |
| if t&3 != 0 { |
| ldr.Errorf(s, "direct call is not aligned: %s %x", ldr.SymName(rs), t) |
| } |
| |
| // check if target address is in the same 256 MB region as the next instruction |
| if (ldr.SymValue(s)+int64(r.Off())+4)&0xf0000000 != (t & 0xf0000000) { |
| ldr.Errorf(s, "direct call too far: %s %x", ldr.SymName(rs), t) |
| } |
| |
| return applyrel(target.Arch, ldr, rt, r.Off(), s, val, t), noExtReloc, isOk |
| case objabi.R_ADDRMIPSTLS: |
| // thread pointer is at 0x7000 offset from the start of TLS data area |
| t := ldr.SymValue(rs) + r.Add() - 0x7000 |
| if t < -32768 || t >= 32678 { |
| ldr.Errorf(s, "TLS offset out of range %d", t) |
| } |
| return applyrel(target.Arch, ldr, rt, r.Off(), s, val, t), noExtReloc, isOk |
| } |
| |
| return val, 0, false |
| } |
| |
| func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 { |
| return -1 |
| } |
| |
| func extreloc(target *ld.Target, ldr *loader.Loader, r loader.Reloc, s loader.Sym) (loader.ExtReloc, bool) { |
| switch r.Type() { |
| case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU: |
| return ld.ExtrelocViaOuterSym(ldr, r, s), true |
| |
| case objabi.R_ADDRMIPSTLS, objabi.R_CALLMIPS, objabi.R_JMPMIPS: |
| return ld.ExtrelocSimple(ldr, r), true |
| } |
| return loader.ExtReloc{}, false |
| } |