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asm.go
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asm.go
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// 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 (
"debug/elf"
"github.com/go-asm/go/cmd/link/ld"
"github.com/go-asm/go/cmd/link/loader"
"github.com/go-asm/go/cmd/link/sym"
"github.com/go-asm/go/cmd/objabi"
"github.com/go-asm/go/cmd/sys"
)
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, 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
}