1 // Derived from Inferno utils/6l/obj.c and utils/6l/span.c
2 // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c
3 // http://code.google.com/p/inferno-os/source/browse/utils/6l/span.c
5 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
6 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
7 // Portions Copyright © 1997-1999 Vita Nuova Limited
8 // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
9 // Portions Copyright © 2004,2006 Bruce Ellis
10 // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
11 // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
12 // Portions Copyright © 2009 The Go Authors. All rights reserved.
14 // Permission is hereby granted, free of charge, to any person obtaining a copy
15 // of this software and associated documentation files (the "Software"), to deal
16 // in the Software without restriction, including without limitation the rights
17 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 // copies of the Software, and to permit persons to whom the Software is
19 // furnished to do so, subject to the following conditions:
21 // The above copyright notice and this permission notice shall be included in
22 // all copies or substantial portions of the Software.
24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
39 // Grow increases the length of s.P to lsiz.
40 func (s *LSym) Grow(lsiz int64) {
42 if int64(siz) != lsiz {
43 log.Fatalf("LSym.Grow size %d too long", lsiz)
48 // TODO(dfc) append cap-len at once, rather than
49 // one byte at a time.
51 s.P = append(s.P[:cap(s.P)], 0)
56 // GrowCap increases the capacity of s.P to c.
57 func (s *LSym) GrowCap(c int64) {
58 if int64(cap(s.P)) >= c {
62 s.P = make([]byte, 0, c)
65 b := make([]byte, len(s.P), c)
70 // prepwrite prepares to write data of size siz into s at offset off.
71 func (s *LSym) prepwrite(ctxt *Link, off int64, siz int) {
72 if off < 0 || siz < 0 || off >= 1<<30 {
73 log.Fatalf("prepwrite: bad off=%d siz=%d", off, siz)
75 if s.Type == SBSS || s.Type == STLSBSS {
76 ctxt.Diag("cannot supply data for BSS var")
85 // WriteFloat32 writes f into s at offset off.
86 func (s *LSym) WriteFloat32(ctxt *Link, off int64, f float32) {
87 s.prepwrite(ctxt, off, 4)
88 ctxt.Arch.ByteOrder.PutUint32(s.P[off:], math.Float32bits(f))
91 // WriteFloat64 writes f into s at offset off.
92 func (s *LSym) WriteFloat64(ctxt *Link, off int64, f float64) {
93 s.prepwrite(ctxt, off, 8)
94 ctxt.Arch.ByteOrder.PutUint64(s.P[off:], math.Float64bits(f))
97 // WriteInt writes an integer i of size siz into s at offset off.
98 func (s *LSym) WriteInt(ctxt *Link, off int64, siz int, i int64) {
99 s.prepwrite(ctxt, off, siz)
102 ctxt.Diag("WriteInt: bad integer size: %d", siz)
106 ctxt.Arch.ByteOrder.PutUint16(s.P[off:], uint16(i))
108 ctxt.Arch.ByteOrder.PutUint32(s.P[off:], uint32(i))
110 ctxt.Arch.ByteOrder.PutUint64(s.P[off:], uint64(i))
114 // WriteAddr writes an address of size siz into s at offset off.
115 // rsym and roff specify the relocation for the address.
116 func (s *LSym) WriteAddr(ctxt *Link, off int64, siz int, rsym *LSym, roff int64) {
117 if siz != ctxt.Arch.PtrSize {
118 ctxt.Diag("WriteAddr: bad address size %d in %s", siz, s.Name)
120 s.prepwrite(ctxt, off, siz)
123 if int64(r.Off) != off {
124 ctxt.Diag("WriteAddr: off overflow %d in %s", off, s.Name)
132 // WriteOff writes a 4 byte offset to rsym+roff into s at offset off.
133 // After linking the 4 bytes stored at s+off will be
134 // rsym+roff-(start of section that s is in).
135 func (s *LSym) WriteOff(ctxt *Link, off int64, rsym *LSym, roff int64) {
136 s.prepwrite(ctxt, off, 4)
139 if int64(r.Off) != off {
140 ctxt.Diag("WriteOff: off overflow %d in %s", off, s.Name)
148 // WriteString writes a string of size siz into s at offset off.
149 func (s *LSym) WriteString(ctxt *Link, off int64, siz int, str string) {
151 ctxt.Diag("WriteString: bad string size: %d < %d", siz, len(str))
153 s.prepwrite(ctxt, off, siz)
154 copy(s.P[off:off+int64(siz)], str)
157 // WriteBytes writes a slice of bytes into s at offset off.
158 func (s *LSym) WriteBytes(ctxt *Link, off int64, b []byte) int64 {
159 s.prepwrite(ctxt, off, len(b))
161 return off + int64(len(b))
164 func Addrel(s *LSym) *Reloc {
165 s.R = append(s.R, Reloc{})
166 return &s.R[len(s.R)-1]
169 func Setuintxx(ctxt *Link, s *LSym, off int64, v uint64, wid int64) int64 {
173 if s.Size < off+wid {
182 ctxt.Arch.ByteOrder.PutUint16(s.P[off:], uint16(v))
184 ctxt.Arch.ByteOrder.PutUint32(s.P[off:], uint32(v))
186 ctxt.Arch.ByteOrder.PutUint64(s.P[off:], v)