Source file src/pkg/cmd/link/internal/mips/asm.go
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31 package mips
32
33 import (
34 "cmd/internal/objabi"
35 "cmd/internal/sys"
36 "cmd/link/internal/ld"
37 "cmd/link/internal/sym"
38 "debug/elf"
39 "fmt"
40 "log"
41 )
42
43 func gentext(ctxt *ld.Link) {
44 return
45 }
46
47 func adddynrel(ctxt *ld.Link, s *sym.Symbol, r *sym.Reloc) bool {
48 log.Fatalf("adddynrel not implemented")
49 return false
50 }
51
52 func elfreloc1(ctxt *ld.Link, r *sym.Reloc, sectoff int64) bool {
53 ctxt.Out.Write32(uint32(sectoff))
54
55 elfsym := r.Xsym.ElfsymForReloc()
56 switch r.Type {
57 default:
58 return false
59 case objabi.R_ADDR:
60 if r.Siz != 4 {
61 return false
62 }
63 ctxt.Out.Write32(uint32(elf.R_MIPS_32) | uint32(elfsym)<<8)
64 case objabi.R_ADDRMIPS:
65 ctxt.Out.Write32(uint32(elf.R_MIPS_LO16) | uint32(elfsym)<<8)
66 case objabi.R_ADDRMIPSU:
67 ctxt.Out.Write32(uint32(elf.R_MIPS_HI16) | uint32(elfsym)<<8)
68 case objabi.R_ADDRMIPSTLS:
69 ctxt.Out.Write32(uint32(elf.R_MIPS_TLS_TPREL_LO16) | uint32(elfsym)<<8)
70 case objabi.R_CALLMIPS, objabi.R_JMPMIPS:
71 ctxt.Out.Write32(uint32(elf.R_MIPS_26) | uint32(elfsym)<<8)
72 }
73
74 return true
75 }
76
77 func elfsetupplt(ctxt *ld.Link) {
78 return
79 }
80
81 func machoreloc1(arch *sys.Arch, out *ld.OutBuf, s *sym.Symbol, r *sym.Reloc, sectoff int64) bool {
82 return false
83 }
84
85 func applyrel(arch *sys.Arch, r *sym.Reloc, s *sym.Symbol, val int64, t int64) int64 {
86 o := arch.ByteOrder.Uint32(s.P[r.Off:])
87 switch r.Type {
88 case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSTLS:
89 return int64(o&0xffff0000 | uint32(t)&0xffff)
90 case objabi.R_ADDRMIPSU:
91 return int64(o&0xffff0000 | uint32((t+(1<<15))>>16)&0xffff)
92 case objabi.R_CALLMIPS, objabi.R_JMPMIPS:
93 return int64(o&0xfc000000 | uint32(t>>2)&^0xfc000000)
94 default:
95 return val
96 }
97 }
98
99 func archreloc(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, val int64) (int64, bool) {
100 if ctxt.LinkMode == ld.LinkExternal {
101 switch r.Type {
102 default:
103 return val, false
104 case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU:
105 r.Done = false
106
107
108 rs := r.Sym
109 r.Xadd = r.Add
110 for rs.Outer != nil {
111 r.Xadd += ld.Symaddr(rs) - ld.Symaddr(rs.Outer)
112 rs = rs.Outer
113 }
114
115 if rs.Type != sym.SHOSTOBJ && rs.Type != sym.SDYNIMPORT && rs.Sect == nil {
116 ld.Errorf(s, "missing section for %s", rs.Name)
117 }
118 r.Xsym = rs
119 return applyrel(ctxt.Arch, r, s, val, r.Xadd), true
120 case objabi.R_ADDRMIPSTLS, objabi.R_CALLMIPS, objabi.R_JMPMIPS:
121 r.Done = false
122 r.Xsym = r.Sym
123 r.Xadd = r.Add
124 return applyrel(ctxt.Arch, r, s, val, r.Add), true
125 }
126 }
127
128 switch r.Type {
129 case objabi.R_CONST:
130 return r.Add, true
131 case objabi.R_GOTOFF:
132 return ld.Symaddr(r.Sym) + r.Add - ld.Symaddr(ctxt.Syms.Lookup(".got", 0)), true
133 case objabi.R_ADDRMIPS, objabi.R_ADDRMIPSU:
134 t := ld.Symaddr(r.Sym) + r.Add
135 return applyrel(ctxt.Arch, r, s, val, t), true
136 case objabi.R_CALLMIPS, objabi.R_JMPMIPS:
137 t := ld.Symaddr(r.Sym) + r.Add
138
139 if t&3 != 0 {
140 ld.Errorf(s, "direct call is not aligned: %s %x", r.Sym.Name, t)
141 }
142
143
144 if (s.Value+int64(r.Off)+4)&0xf0000000 != (t & 0xf0000000) {
145 ld.Errorf(s, "direct call too far: %s %x", r.Sym.Name, t)
146 }
147
148 return applyrel(ctxt.Arch, r, s, val, t), true
149 case objabi.R_ADDRMIPSTLS:
150
151 t := ld.Symaddr(r.Sym) + r.Add - 0x7000
152 if t < -32768 || t >= 32678 {
153 ld.Errorf(s, "TLS offset out of range %d", t)
154 }
155 return applyrel(ctxt.Arch, r, s, val, t), true
156 }
157
158 return val, false
159 }
160
161 func archrelocvariant(ctxt *ld.Link, r *sym.Reloc, s *sym.Symbol, t int64) int64 {
162 return -1
163 }
164
165 func asmb(ctxt *ld.Link) {
166 if ctxt.Debugvlog != 0 {
167 ctxt.Logf("%5.2f asmb\n", ld.Cputime())
168 }
169
170 if ctxt.IsELF {
171 ld.Asmbelfsetup()
172 }
173
174 sect := ld.Segtext.Sections[0]
175 ctxt.Out.SeekSet(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
176 ld.Codeblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
177 for _, sect = range ld.Segtext.Sections[1:] {
178 ctxt.Out.SeekSet(int64(sect.Vaddr - ld.Segtext.Vaddr + ld.Segtext.Fileoff))
179 ld.Datblk(ctxt, int64(sect.Vaddr), int64(sect.Length))
180 }
181
182 if ld.Segrodata.Filelen > 0 {
183 if ctxt.Debugvlog != 0 {
184 ctxt.Logf("%5.2f rodatblk\n", ld.Cputime())
185 }
186
187 ctxt.Out.SeekSet(int64(ld.Segrodata.Fileoff))
188 ld.Datblk(ctxt, int64(ld.Segrodata.Vaddr), int64(ld.Segrodata.Filelen))
189 }
190
191 if ctxt.Debugvlog != 0 {
192 ctxt.Logf("%5.2f datblk\n", ld.Cputime())
193 }
194
195 ctxt.Out.SeekSet(int64(ld.Segdata.Fileoff))
196 ld.Datblk(ctxt, int64(ld.Segdata.Vaddr), int64(ld.Segdata.Filelen))
197
198 ctxt.Out.SeekSet(int64(ld.Segdwarf.Fileoff))
199 ld.Dwarfblk(ctxt, int64(ld.Segdwarf.Vaddr), int64(ld.Segdwarf.Filelen))
200 }
201
202 func asmb2(ctxt *ld.Link) {
203
204 ld.Symsize = 0
205
206 ld.Lcsize = 0
207 symo := uint32(0)
208 if !*ld.FlagS {
209 if !ctxt.IsELF {
210 ld.Errorf(nil, "unsupported executable format")
211 }
212 if ctxt.Debugvlog != 0 {
213 ctxt.Logf("%5.2f sym\n", ld.Cputime())
214 }
215 symo = uint32(ld.Segdwarf.Fileoff + ld.Segdwarf.Filelen)
216 symo = uint32(ld.Rnd(int64(symo), int64(*ld.FlagRound)))
217
218 ctxt.Out.SeekSet(int64(symo))
219 if ctxt.Debugvlog != 0 {
220 ctxt.Logf("%5.2f elfsym\n", ld.Cputime())
221 }
222 ld.Asmelfsym(ctxt)
223 ctxt.Out.Flush()
224 ctxt.Out.Write(ld.Elfstrdat)
225
226 if ctxt.Debugvlog != 0 {
227 ctxt.Logf("%5.2f dwarf\n", ld.Cputime())
228 }
229
230 if ctxt.LinkMode == ld.LinkExternal {
231 ld.Elfemitreloc(ctxt)
232 }
233 }
234
235 if ctxt.Debugvlog != 0 {
236 ctxt.Logf("%5.2f header\n", ld.Cputime())
237 }
238
239 ctxt.Out.SeekSet(0)
240 switch ctxt.HeadType {
241 default:
242 ld.Errorf(nil, "unsupported operating system")
243 case objabi.Hlinux:
244 ld.Asmbelf(ctxt, int64(symo))
245 }
246
247 ctxt.Out.Flush()
248 if *ld.FlagC {
249 fmt.Printf("textsize=%d\n", ld.Segtext.Filelen)
250 fmt.Printf("datsize=%d\n", ld.Segdata.Filelen)
251 fmt.Printf("bsssize=%d\n", ld.Segdata.Length-ld.Segdata.Filelen)
252 fmt.Printf("symsize=%d\n", ld.Symsize)
253 fmt.Printf("lcsize=%d\n", ld.Lcsize)
254 fmt.Printf("total=%d\n", ld.Segtext.Filelen+ld.Segdata.Length+uint64(ld.Symsize)+uint64(ld.Lcsize))
255 }
256 }
257
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