Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 1 | // Derived from Inferno utils/5c/swt.c |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 2 | // https://bitbucket.org/inferno-os/inferno-os/src/default/utils/5c/swt.c |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 3 | // |
| 4 | // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. |
| 5 | // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) |
| 6 | // Portions Copyright © 1997-1999 Vita Nuova Limited |
| 7 | // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) |
| 8 | // Portions Copyright © 2004,2006 Bruce Ellis |
| 9 | // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) |
| 10 | // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 11 | // Portions Copyright © 2009 The Go Authors. All rights reserved. |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 12 | // |
| 13 | // Permission is hereby granted, free of charge, to any person obtaining a copy |
| 14 | // of this software and associated documentation files (the "Software"), to deal |
| 15 | // in the Software without restriction, including without limitation the rights |
| 16 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 17 | // copies of the Software, and to permit persons to whom the Software is |
| 18 | // furnished to do so, subject to the following conditions: |
| 19 | // |
| 20 | // The above copyright notice and this permission notice shall be included in |
| 21 | // all copies or substantial portions of the Software. |
| 22 | // |
| 23 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 24 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 25 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 26 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 27 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 28 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 29 | // THE SOFTWARE. |
| 30 | |
| 31 | package arm |
| 32 | |
| 33 | import ( |
| 34 | "cmd/internal/obj" |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 35 | "cmd/internal/sys" |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 36 | "fmt" |
| 37 | "log" |
| 38 | "math" |
| 39 | ) |
| 40 | |
| 41 | var progedit_tlsfallback *obj.LSym |
| 42 | |
| 43 | func progedit(ctxt *obj.Link, p *obj.Prog) { |
| 44 | p.From.Class = 0 |
| 45 | p.To.Class = 0 |
| 46 | |
| 47 | // Rewrite B/BL to symbol as TYPE_BRANCH. |
| 48 | switch p.As { |
| 49 | case AB, |
| 50 | ABL, |
| 51 | obj.ADUFFZERO, |
| 52 | obj.ADUFFCOPY: |
| 53 | if p.To.Type == obj.TYPE_MEM && (p.To.Name == obj.NAME_EXTERN || p.To.Name == obj.NAME_STATIC) && p.To.Sym != nil { |
| 54 | p.To.Type = obj.TYPE_BRANCH |
| 55 | } |
| 56 | } |
| 57 | |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 58 | // Replace TLS register fetches on older ARM processors. |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 59 | switch p.As { |
| 60 | // Treat MRC 15, 0, <reg>, C13, C0, 3 specially. |
| 61 | case AMRC: |
| 62 | if p.To.Offset&0xffff0fff == 0xee1d0f70 { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 63 | // Because the instruction might be rewritten to a BL which returns in R0 |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 64 | // the register must be zero. |
| 65 | if p.To.Offset&0xf000 != 0 { |
| 66 | ctxt.Diag("%v: TLS MRC instruction must write to R0 as it might get translated into a BL instruction", p.Line()) |
| 67 | } |
| 68 | |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 69 | if obj.GOARM < 7 { |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 70 | // Replace it with BL runtime.read_tls_fallback(SB) for ARM CPUs that lack the tls extension. |
| 71 | if progedit_tlsfallback == nil { |
| 72 | progedit_tlsfallback = obj.Linklookup(ctxt, "runtime.read_tls_fallback", 0) |
| 73 | } |
| 74 | |
| 75 | // MOVW LR, R11 |
| 76 | p.As = AMOVW |
| 77 | |
| 78 | p.From.Type = obj.TYPE_REG |
| 79 | p.From.Reg = REGLINK |
| 80 | p.To.Type = obj.TYPE_REG |
| 81 | p.To.Reg = REGTMP |
| 82 | |
| 83 | // BL runtime.read_tls_fallback(SB) |
| 84 | p = obj.Appendp(ctxt, p) |
| 85 | |
| 86 | p.As = ABL |
| 87 | p.To.Type = obj.TYPE_BRANCH |
| 88 | p.To.Sym = progedit_tlsfallback |
| 89 | p.To.Offset = 0 |
| 90 | |
| 91 | // MOVW R11, LR |
| 92 | p = obj.Appendp(ctxt, p) |
| 93 | |
| 94 | p.As = AMOVW |
| 95 | p.From.Type = obj.TYPE_REG |
| 96 | p.From.Reg = REGTMP |
| 97 | p.To.Type = obj.TYPE_REG |
| 98 | p.To.Reg = REGLINK |
| 99 | break |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | // Otherwise, MRC/MCR instructions need no further treatment. |
| 104 | p.As = AWORD |
| 105 | } |
| 106 | |
| 107 | // Rewrite float constants to values stored in memory. |
| 108 | switch p.As { |
| 109 | case AMOVF: |
| 110 | if p.From.Type == obj.TYPE_FCONST && chipfloat5(ctxt, p.From.Val.(float64)) < 0 && (chipzero5(ctxt, p.From.Val.(float64)) < 0 || p.Scond&C_SCOND != C_SCOND_NONE) { |
| 111 | f32 := float32(p.From.Val.(float64)) |
| 112 | i32 := math.Float32bits(f32) |
| 113 | literal := fmt.Sprintf("$f32.%08x", i32) |
| 114 | s := obj.Linklookup(ctxt, literal, 0) |
| 115 | p.From.Type = obj.TYPE_MEM |
| 116 | p.From.Sym = s |
| 117 | p.From.Name = obj.NAME_EXTERN |
| 118 | p.From.Offset = 0 |
| 119 | } |
| 120 | |
| 121 | case AMOVD: |
| 122 | if p.From.Type == obj.TYPE_FCONST && chipfloat5(ctxt, p.From.Val.(float64)) < 0 && (chipzero5(ctxt, p.From.Val.(float64)) < 0 || p.Scond&C_SCOND != C_SCOND_NONE) { |
| 123 | i64 := math.Float64bits(p.From.Val.(float64)) |
| 124 | literal := fmt.Sprintf("$f64.%016x", i64) |
| 125 | s := obj.Linklookup(ctxt, literal, 0) |
| 126 | p.From.Type = obj.TYPE_MEM |
| 127 | p.From.Sym = s |
| 128 | p.From.Name = obj.NAME_EXTERN |
| 129 | p.From.Offset = 0 |
| 130 | } |
| 131 | } |
| 132 | |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 133 | if ctxt.Flag_dynlink { |
| 134 | rewriteToUseGot(ctxt, p) |
| 135 | } |
| 136 | } |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 137 | |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 138 | // Rewrite p, if necessary, to access global data via the global offset table. |
| 139 | func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog) { |
| 140 | if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO { |
| 141 | // ADUFFxxx $offset |
| 142 | // becomes |
| 143 | // MOVW runtime.duffxxx@GOT, R9 |
| 144 | // ADD $offset, R9 |
| 145 | // CALL (R9) |
| 146 | var sym *obj.LSym |
| 147 | if p.As == obj.ADUFFZERO { |
| 148 | sym = obj.Linklookup(ctxt, "runtime.duffzero", 0) |
| 149 | } else { |
| 150 | sym = obj.Linklookup(ctxt, "runtime.duffcopy", 0) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 151 | } |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 152 | offset := p.To.Offset |
| 153 | p.As = AMOVW |
| 154 | p.From.Type = obj.TYPE_MEM |
| 155 | p.From.Name = obj.NAME_GOTREF |
| 156 | p.From.Sym = sym |
| 157 | p.To.Type = obj.TYPE_REG |
| 158 | p.To.Reg = REG_R9 |
| 159 | p.To.Name = obj.NAME_NONE |
| 160 | p.To.Offset = 0 |
| 161 | p.To.Sym = nil |
| 162 | p1 := obj.Appendp(ctxt, p) |
| 163 | p1.As = AADD |
| 164 | p1.From.Type = obj.TYPE_CONST |
| 165 | p1.From.Offset = offset |
| 166 | p1.To.Type = obj.TYPE_REG |
| 167 | p1.To.Reg = REG_R9 |
| 168 | p2 := obj.Appendp(ctxt, p1) |
| 169 | p2.As = obj.ACALL |
| 170 | p2.To.Type = obj.TYPE_MEM |
| 171 | p2.To.Reg = REG_R9 |
| 172 | return |
| 173 | } |
| 174 | |
| 175 | // We only care about global data: NAME_EXTERN means a global |
| 176 | // symbol in the Go sense, and p.Sym.Local is true for a few |
| 177 | // internally defined symbols. |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 178 | if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 179 | // MOVW $sym, Rx becomes MOVW sym@GOT, Rx |
| 180 | // MOVW $sym+<off>, Rx becomes MOVW sym@GOT, Rx; ADD <off>, Rx |
| 181 | if p.As != AMOVW { |
| 182 | ctxt.Diag("do not know how to handle TYPE_ADDR in %v with -dynlink", p) |
| 183 | } |
| 184 | if p.To.Type != obj.TYPE_REG { |
| 185 | ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v with -dynlink", p) |
| 186 | } |
| 187 | p.From.Type = obj.TYPE_MEM |
| 188 | p.From.Name = obj.NAME_GOTREF |
| 189 | if p.From.Offset != 0 { |
| 190 | q := obj.Appendp(ctxt, p) |
| 191 | q.As = AADD |
| 192 | q.From.Type = obj.TYPE_CONST |
| 193 | q.From.Offset = p.From.Offset |
| 194 | q.To = p.To |
| 195 | p.From.Offset = 0 |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 196 | } |
| 197 | } |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 198 | if p.From3 != nil && p.From3.Name == obj.NAME_EXTERN { |
| 199 | ctxt.Diag("don't know how to handle %v with -dynlink", p) |
| 200 | } |
| 201 | var source *obj.Addr |
| 202 | // MOVx sym, Ry becomes MOVW sym@GOT, R9; MOVx (R9), Ry |
| 203 | // MOVx Ry, sym becomes MOVW sym@GOT, R9; MOVx Ry, (R9) |
| 204 | // An addition may be inserted between the two MOVs if there is an offset. |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 205 | if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local() { |
| 206 | if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 207 | ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p) |
| 208 | } |
| 209 | source = &p.From |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 210 | } else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local() { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 211 | source = &p.To |
| 212 | } else { |
| 213 | return |
| 214 | } |
| 215 | if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP { |
| 216 | return |
| 217 | } |
| 218 | if source.Sym.Type == obj.STLSBSS { |
| 219 | return |
| 220 | } |
| 221 | if source.Type != obj.TYPE_MEM { |
| 222 | ctxt.Diag("don't know how to handle %v with -dynlink", p) |
| 223 | } |
| 224 | p1 := obj.Appendp(ctxt, p) |
| 225 | p2 := obj.Appendp(ctxt, p1) |
| 226 | |
| 227 | p1.As = AMOVW |
| 228 | p1.From.Type = obj.TYPE_MEM |
| 229 | p1.From.Sym = source.Sym |
| 230 | p1.From.Name = obj.NAME_GOTREF |
| 231 | p1.To.Type = obj.TYPE_REG |
| 232 | p1.To.Reg = REG_R9 |
| 233 | |
| 234 | p2.As = p.As |
| 235 | p2.From = p.From |
| 236 | p2.To = p.To |
| 237 | if p.From.Name == obj.NAME_EXTERN { |
| 238 | p2.From.Reg = REG_R9 |
| 239 | p2.From.Name = obj.NAME_NONE |
| 240 | p2.From.Sym = nil |
| 241 | } else if p.To.Name == obj.NAME_EXTERN { |
| 242 | p2.To.Reg = REG_R9 |
| 243 | p2.To.Name = obj.NAME_NONE |
| 244 | p2.To.Sym = nil |
| 245 | } else { |
| 246 | return |
| 247 | } |
| 248 | obj.Nopout(p) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | // Prog.mark |
| 252 | const ( |
| 253 | FOLL = 1 << 0 |
| 254 | LABEL = 1 << 1 |
| 255 | LEAF = 1 << 2 |
| 256 | ) |
| 257 | |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 258 | func preprocess(ctxt *obj.Link, cursym *obj.LSym) { |
| 259 | autosize := int32(0) |
| 260 | |
| 261 | ctxt.Cursym = cursym |
| 262 | |
| 263 | if cursym.Text == nil || cursym.Text.Link == nil { |
| 264 | return |
| 265 | } |
| 266 | |
| 267 | softfloat(ctxt, cursym) |
| 268 | |
| 269 | p := cursym.Text |
| 270 | autoffset := int32(p.To.Offset) |
| 271 | if autoffset < 0 { |
| 272 | autoffset = 0 |
| 273 | } |
| 274 | cursym.Locals = autoffset |
| 275 | cursym.Args = p.To.Val.(int32) |
| 276 | |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 277 | /* |
| 278 | * find leaf subroutines |
| 279 | * strip NOPs |
| 280 | * expand RET |
| 281 | * expand BECOME pseudo |
| 282 | */ |
| 283 | var q1 *obj.Prog |
| 284 | var q *obj.Prog |
| 285 | for p := cursym.Text; p != nil; p = p.Link { |
| 286 | switch p.As { |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 287 | case obj.ATEXT: |
| 288 | p.Mark |= LEAF |
| 289 | |
| 290 | case obj.ARET: |
| 291 | break |
| 292 | |
| 293 | case ADIV, ADIVU, AMOD, AMODU: |
| 294 | q = p |
| 295 | if ctxt.Sym_div == nil { |
| 296 | initdiv(ctxt) |
| 297 | } |
| 298 | cursym.Text.Mark &^= LEAF |
| 299 | continue |
| 300 | |
| 301 | case obj.ANOP: |
| 302 | q1 = p.Link |
| 303 | q.Link = q1 /* q is non-nop */ |
| 304 | if q1 != nil { |
| 305 | q1.Mark |= p.Mark |
| 306 | } |
| 307 | continue |
| 308 | |
| 309 | case ABL, |
| 310 | ABX, |
| 311 | obj.ADUFFZERO, |
| 312 | obj.ADUFFCOPY: |
| 313 | cursym.Text.Mark &^= LEAF |
| 314 | fallthrough |
| 315 | |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 316 | case AB, |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 317 | ABEQ, |
| 318 | ABNE, |
| 319 | ABCS, |
| 320 | ABHS, |
| 321 | ABCC, |
| 322 | ABLO, |
| 323 | ABMI, |
| 324 | ABPL, |
| 325 | ABVS, |
| 326 | ABVC, |
| 327 | ABHI, |
| 328 | ABLS, |
| 329 | ABGE, |
| 330 | ABLT, |
| 331 | ABGT, |
| 332 | ABLE: |
| 333 | q1 = p.Pcond |
| 334 | if q1 != nil { |
| 335 | for q1.As == obj.ANOP { |
| 336 | q1 = q1.Link |
| 337 | p.Pcond = q1 |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | q = p |
| 343 | } |
| 344 | |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 345 | var p1 *obj.Prog |
| 346 | var p2 *obj.Prog |
| 347 | var q2 *obj.Prog |
| 348 | for p := cursym.Text; p != nil; p = p.Link { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 349 | o := p.As |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 350 | switch o { |
| 351 | case obj.ATEXT: |
| 352 | autosize = int32(p.To.Offset + 4) |
| 353 | if autosize <= 4 { |
| 354 | if cursym.Text.Mark&LEAF != 0 { |
| 355 | p.To.Offset = -4 |
| 356 | autosize = 0 |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | if autosize == 0 && cursym.Text.Mark&LEAF == 0 { |
| 361 | if ctxt.Debugvlog != 0 { |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 362 | ctxt.Logf("save suppressed in: %s\n", cursym.Name) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | cursym.Text.Mark |= LEAF |
| 366 | } |
| 367 | |
| 368 | if cursym.Text.Mark&LEAF != 0 { |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 369 | cursym.Set(obj.AttrLeaf, true) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 370 | if autosize == 0 { |
| 371 | break |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | if p.From3.Offset&obj.NOSPLIT == 0 { |
| 376 | p = stacksplit(ctxt, p, autosize) // emit split check |
| 377 | } |
| 378 | |
| 379 | // MOVW.W R14,$-autosize(SP) |
| 380 | p = obj.Appendp(ctxt, p) |
| 381 | |
| 382 | p.As = AMOVW |
| 383 | p.Scond |= C_WBIT |
| 384 | p.From.Type = obj.TYPE_REG |
| 385 | p.From.Reg = REGLINK |
| 386 | p.To.Type = obj.TYPE_MEM |
| 387 | p.To.Offset = int64(-autosize) |
| 388 | p.To.Reg = REGSP |
| 389 | p.Spadj = autosize |
| 390 | |
| 391 | if cursym.Text.From3.Offset&obj.WRAPPER != 0 { |
| 392 | // if(g->panic != nil && g->panic->argp == FP) g->panic->argp = bottom-of-frame |
| 393 | // |
| 394 | // MOVW g_panic(g), R1 |
| 395 | // CMP $0, R1 |
| 396 | // B.EQ end |
| 397 | // MOVW panic_argp(R1), R2 |
| 398 | // ADD $(autosize+4), R13, R3 |
| 399 | // CMP R2, R3 |
| 400 | // B.NE end |
| 401 | // ADD $4, R13, R4 |
| 402 | // MOVW R4, panic_argp(R1) |
| 403 | // end: |
| 404 | // NOP |
| 405 | // |
| 406 | // The NOP is needed to give the jumps somewhere to land. |
| 407 | // It is a liblink NOP, not an ARM NOP: it encodes to 0 instruction bytes. |
| 408 | |
| 409 | p = obj.Appendp(ctxt, p) |
| 410 | |
| 411 | p.As = AMOVW |
| 412 | p.From.Type = obj.TYPE_MEM |
| 413 | p.From.Reg = REGG |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 414 | p.From.Offset = 4 * int64(ctxt.Arch.PtrSize) // G.panic |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 415 | p.To.Type = obj.TYPE_REG |
| 416 | p.To.Reg = REG_R1 |
| 417 | |
| 418 | p = obj.Appendp(ctxt, p) |
| 419 | p.As = ACMP |
| 420 | p.From.Type = obj.TYPE_CONST |
| 421 | p.From.Offset = 0 |
| 422 | p.Reg = REG_R1 |
| 423 | |
| 424 | p = obj.Appendp(ctxt, p) |
| 425 | p.As = ABEQ |
| 426 | p.To.Type = obj.TYPE_BRANCH |
| 427 | p1 = p |
| 428 | |
| 429 | p = obj.Appendp(ctxt, p) |
| 430 | p.As = AMOVW |
| 431 | p.From.Type = obj.TYPE_MEM |
| 432 | p.From.Reg = REG_R1 |
| 433 | p.From.Offset = 0 // Panic.argp |
| 434 | p.To.Type = obj.TYPE_REG |
| 435 | p.To.Reg = REG_R2 |
| 436 | |
| 437 | p = obj.Appendp(ctxt, p) |
| 438 | p.As = AADD |
| 439 | p.From.Type = obj.TYPE_CONST |
| 440 | p.From.Offset = int64(autosize) + 4 |
| 441 | p.Reg = REG_R13 |
| 442 | p.To.Type = obj.TYPE_REG |
| 443 | p.To.Reg = REG_R3 |
| 444 | |
| 445 | p = obj.Appendp(ctxt, p) |
| 446 | p.As = ACMP |
| 447 | p.From.Type = obj.TYPE_REG |
| 448 | p.From.Reg = REG_R2 |
| 449 | p.Reg = REG_R3 |
| 450 | |
| 451 | p = obj.Appendp(ctxt, p) |
| 452 | p.As = ABNE |
| 453 | p.To.Type = obj.TYPE_BRANCH |
| 454 | p2 = p |
| 455 | |
| 456 | p = obj.Appendp(ctxt, p) |
| 457 | p.As = AADD |
| 458 | p.From.Type = obj.TYPE_CONST |
| 459 | p.From.Offset = 4 |
| 460 | p.Reg = REG_R13 |
| 461 | p.To.Type = obj.TYPE_REG |
| 462 | p.To.Reg = REG_R4 |
| 463 | |
| 464 | p = obj.Appendp(ctxt, p) |
| 465 | p.As = AMOVW |
| 466 | p.From.Type = obj.TYPE_REG |
| 467 | p.From.Reg = REG_R4 |
| 468 | p.To.Type = obj.TYPE_MEM |
| 469 | p.To.Reg = REG_R1 |
| 470 | p.To.Offset = 0 // Panic.argp |
| 471 | |
| 472 | p = obj.Appendp(ctxt, p) |
| 473 | |
| 474 | p.As = obj.ANOP |
| 475 | p1.Pcond = p |
| 476 | p2.Pcond = p |
| 477 | } |
| 478 | |
| 479 | case obj.ARET: |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 480 | nocache(p) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 481 | if cursym.Text.Mark&LEAF != 0 { |
| 482 | if autosize == 0 { |
| 483 | p.As = AB |
| 484 | p.From = obj.Addr{} |
| 485 | if p.To.Sym != nil { // retjmp |
| 486 | p.To.Type = obj.TYPE_BRANCH |
| 487 | } else { |
| 488 | p.To.Type = obj.TYPE_MEM |
| 489 | p.To.Offset = 0 |
| 490 | p.To.Reg = REGLINK |
| 491 | } |
| 492 | |
| 493 | break |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | p.As = AMOVW |
| 498 | p.Scond |= C_PBIT |
| 499 | p.From.Type = obj.TYPE_MEM |
| 500 | p.From.Offset = int64(autosize) |
| 501 | p.From.Reg = REGSP |
| 502 | p.To.Type = obj.TYPE_REG |
| 503 | p.To.Reg = REGPC |
| 504 | |
| 505 | // If there are instructions following |
| 506 | // this ARET, they come from a branch |
| 507 | // with the same stackframe, so no spadj. |
| 508 | if p.To.Sym != nil { // retjmp |
| 509 | p.To.Reg = REGLINK |
| 510 | q2 = obj.Appendp(ctxt, p) |
| 511 | q2.As = AB |
| 512 | q2.To.Type = obj.TYPE_BRANCH |
| 513 | q2.To.Sym = p.To.Sym |
| 514 | p.To.Sym = nil |
| 515 | p = q2 |
| 516 | } |
| 517 | |
| 518 | case AADD: |
| 519 | if p.From.Type == obj.TYPE_CONST && p.From.Reg == 0 && p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP { |
| 520 | p.Spadj = int32(-p.From.Offset) |
| 521 | } |
| 522 | |
| 523 | case ASUB: |
| 524 | if p.From.Type == obj.TYPE_CONST && p.From.Reg == 0 && p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP { |
| 525 | p.Spadj = int32(p.From.Offset) |
| 526 | } |
| 527 | |
| 528 | case ADIV, ADIVU, AMOD, AMODU: |
| 529 | if cursym.Text.From3.Offset&obj.NOSPLIT != 0 { |
| 530 | ctxt.Diag("cannot divide in NOSPLIT function") |
| 531 | } |
| 532 | if ctxt.Debugdivmod != 0 { |
| 533 | break |
| 534 | } |
| 535 | if p.From.Type != obj.TYPE_REG { |
| 536 | break |
| 537 | } |
| 538 | if p.To.Type != obj.TYPE_REG { |
| 539 | break |
| 540 | } |
| 541 | |
| 542 | // Make copy because we overwrite p below. |
| 543 | q1 := *p |
| 544 | if q1.Reg == REGTMP || q1.Reg == 0 && q1.To.Reg == REGTMP { |
| 545 | ctxt.Diag("div already using REGTMP: %v", p) |
| 546 | } |
| 547 | |
| 548 | /* MOV m(g),REGTMP */ |
| 549 | p.As = AMOVW |
| 550 | p.Lineno = q1.Lineno |
| 551 | p.From.Type = obj.TYPE_MEM |
| 552 | p.From.Reg = REGG |
| 553 | p.From.Offset = 6 * 4 // offset of g.m |
| 554 | p.Reg = 0 |
| 555 | p.To.Type = obj.TYPE_REG |
| 556 | p.To.Reg = REGTMP |
| 557 | |
| 558 | /* MOV a,m_divmod(REGTMP) */ |
| 559 | p = obj.Appendp(ctxt, p) |
| 560 | p.As = AMOVW |
| 561 | p.Lineno = q1.Lineno |
| 562 | p.From.Type = obj.TYPE_REG |
| 563 | p.From.Reg = q1.From.Reg |
| 564 | p.To.Type = obj.TYPE_MEM |
| 565 | p.To.Reg = REGTMP |
| 566 | p.To.Offset = 8 * 4 // offset of m.divmod |
| 567 | |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 568 | /* MOV b, R8 */ |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 569 | p = obj.Appendp(ctxt, p) |
| 570 | p.As = AMOVW |
| 571 | p.Lineno = q1.Lineno |
| 572 | p.From.Type = obj.TYPE_REG |
| 573 | p.From.Reg = q1.Reg |
| 574 | if q1.Reg == 0 { |
| 575 | p.From.Reg = q1.To.Reg |
| 576 | } |
| 577 | p.To.Type = obj.TYPE_REG |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 578 | p.To.Reg = REG_R8 |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 579 | p.To.Offset = 0 |
| 580 | |
| 581 | /* CALL appropriate */ |
| 582 | p = obj.Appendp(ctxt, p) |
| 583 | p.As = ABL |
| 584 | p.Lineno = q1.Lineno |
| 585 | p.To.Type = obj.TYPE_BRANCH |
| 586 | switch o { |
| 587 | case ADIV: |
| 588 | p.To.Sym = ctxt.Sym_div |
| 589 | |
| 590 | case ADIVU: |
| 591 | p.To.Sym = ctxt.Sym_divu |
| 592 | |
| 593 | case AMOD: |
| 594 | p.To.Sym = ctxt.Sym_mod |
| 595 | |
| 596 | case AMODU: |
| 597 | p.To.Sym = ctxt.Sym_modu |
| 598 | } |
| 599 | |
| 600 | /* MOV REGTMP, b */ |
| 601 | p = obj.Appendp(ctxt, p) |
| 602 | p.As = AMOVW |
| 603 | p.Lineno = q1.Lineno |
| 604 | p.From.Type = obj.TYPE_REG |
| 605 | p.From.Reg = REGTMP |
| 606 | p.From.Offset = 0 |
| 607 | p.To.Type = obj.TYPE_REG |
| 608 | p.To.Reg = q1.To.Reg |
| 609 | |
| 610 | case AMOVW: |
| 611 | if (p.Scond&C_WBIT != 0) && p.To.Type == obj.TYPE_MEM && p.To.Reg == REGSP { |
| 612 | p.Spadj = int32(-p.To.Offset) |
| 613 | } |
| 614 | if (p.Scond&C_PBIT != 0) && p.From.Type == obj.TYPE_MEM && p.From.Reg == REGSP && p.To.Reg != REGPC { |
| 615 | p.Spadj = int32(-p.From.Offset) |
| 616 | } |
| 617 | if p.From.Type == obj.TYPE_ADDR && p.From.Reg == REGSP && p.To.Type == obj.TYPE_REG && p.To.Reg == REGSP { |
| 618 | p.Spadj = int32(-p.From.Offset) |
| 619 | } |
| 620 | } |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | func isfloatreg(a *obj.Addr) bool { |
| 625 | return a.Type == obj.TYPE_REG && REG_F0 <= a.Reg && a.Reg <= REG_F15 |
| 626 | } |
| 627 | |
| 628 | func softfloat(ctxt *obj.Link, cursym *obj.LSym) { |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 629 | if obj.GOARM > 5 { |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 630 | return |
| 631 | } |
| 632 | |
| 633 | symsfloat := obj.Linklookup(ctxt, "_sfloat", 0) |
| 634 | |
| 635 | wasfloat := 0 |
| 636 | for p := cursym.Text; p != nil; p = p.Link { |
| 637 | if p.Pcond != nil { |
| 638 | p.Pcond.Mark |= LABEL |
| 639 | } |
| 640 | } |
| 641 | var next *obj.Prog |
| 642 | for p := cursym.Text; p != nil; p = p.Link { |
| 643 | switch p.As { |
| 644 | case AMOVW: |
| 645 | if isfloatreg(&p.To) || isfloatreg(&p.From) { |
| 646 | goto soft |
| 647 | } |
| 648 | goto notsoft |
| 649 | |
| 650 | case AMOVWD, |
| 651 | AMOVWF, |
| 652 | AMOVDW, |
| 653 | AMOVFW, |
| 654 | AMOVFD, |
| 655 | AMOVDF, |
| 656 | AMOVF, |
| 657 | AMOVD, |
| 658 | ACMPF, |
| 659 | ACMPD, |
| 660 | AADDF, |
| 661 | AADDD, |
| 662 | ASUBF, |
| 663 | ASUBD, |
| 664 | AMULF, |
| 665 | AMULD, |
| 666 | ADIVF, |
| 667 | ADIVD, |
| 668 | ASQRTF, |
| 669 | ASQRTD, |
| 670 | AABSF, |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 671 | AABSD, |
| 672 | ANEGF, |
| 673 | ANEGD: |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 674 | goto soft |
| 675 | |
| 676 | default: |
| 677 | goto notsoft |
| 678 | } |
| 679 | |
| 680 | soft: |
| 681 | if wasfloat == 0 || (p.Mark&LABEL != 0) { |
| 682 | next = ctxt.NewProg() |
| 683 | *next = *p |
| 684 | |
| 685 | // BL _sfloat(SB) |
| 686 | *p = obj.Prog{} |
| 687 | p.Ctxt = ctxt |
| 688 | p.Link = next |
| 689 | p.As = ABL |
| 690 | p.To.Type = obj.TYPE_BRANCH |
| 691 | p.To.Sym = symsfloat |
| 692 | p.Lineno = next.Lineno |
| 693 | |
| 694 | p = next |
| 695 | wasfloat = 1 |
| 696 | } |
| 697 | |
| 698 | continue |
| 699 | |
| 700 | notsoft: |
| 701 | wasfloat = 0 |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog { |
| 706 | // MOVW g_stackguard(g), R1 |
| 707 | p = obj.Appendp(ctxt, p) |
| 708 | |
| 709 | p.As = AMOVW |
| 710 | p.From.Type = obj.TYPE_MEM |
| 711 | p.From.Reg = REGG |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 712 | p.From.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0 |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 713 | if ctxt.Cursym.CFunc() { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 714 | p.From.Offset = 3 * int64(ctxt.Arch.PtrSize) // G.stackguard1 |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 715 | } |
| 716 | p.To.Type = obj.TYPE_REG |
| 717 | p.To.Reg = REG_R1 |
| 718 | |
| 719 | if framesize <= obj.StackSmall { |
| 720 | // small stack: SP < stackguard |
| 721 | // CMP stackguard, SP |
| 722 | p = obj.Appendp(ctxt, p) |
| 723 | |
| 724 | p.As = ACMP |
| 725 | p.From.Type = obj.TYPE_REG |
| 726 | p.From.Reg = REG_R1 |
| 727 | p.Reg = REGSP |
| 728 | } else if framesize <= obj.StackBig { |
| 729 | // large stack: SP-framesize < stackguard-StackSmall |
| 730 | // MOVW $-framesize(SP), R2 |
| 731 | // CMP stackguard, R2 |
| 732 | p = obj.Appendp(ctxt, p) |
| 733 | |
| 734 | p.As = AMOVW |
| 735 | p.From.Type = obj.TYPE_ADDR |
| 736 | p.From.Reg = REGSP |
| 737 | p.From.Offset = int64(-framesize) |
| 738 | p.To.Type = obj.TYPE_REG |
| 739 | p.To.Reg = REG_R2 |
| 740 | |
| 741 | p = obj.Appendp(ctxt, p) |
| 742 | p.As = ACMP |
| 743 | p.From.Type = obj.TYPE_REG |
| 744 | p.From.Reg = REG_R1 |
| 745 | p.Reg = REG_R2 |
| 746 | } else { |
| 747 | // Such a large stack we need to protect against wraparound |
| 748 | // if SP is close to zero. |
| 749 | // SP-stackguard+StackGuard < framesize + (StackGuard-StackSmall) |
| 750 | // The +StackGuard on both sides is required to keep the left side positive: |
| 751 | // SP is allowed to be slightly below stackguard. See stack.h. |
| 752 | // CMP $StackPreempt, R1 |
| 753 | // MOVW.NE $StackGuard(SP), R2 |
| 754 | // SUB.NE R1, R2 |
| 755 | // MOVW.NE $(framesize+(StackGuard-StackSmall)), R3 |
| 756 | // CMP.NE R3, R2 |
| 757 | p = obj.Appendp(ctxt, p) |
| 758 | |
| 759 | p.As = ACMP |
| 760 | p.From.Type = obj.TYPE_CONST |
| 761 | p.From.Offset = int64(uint32(obj.StackPreempt & (1<<32 - 1))) |
| 762 | p.Reg = REG_R1 |
| 763 | |
| 764 | p = obj.Appendp(ctxt, p) |
| 765 | p.As = AMOVW |
| 766 | p.From.Type = obj.TYPE_ADDR |
| 767 | p.From.Reg = REGSP |
| 768 | p.From.Offset = obj.StackGuard |
| 769 | p.To.Type = obj.TYPE_REG |
| 770 | p.To.Reg = REG_R2 |
| 771 | p.Scond = C_SCOND_NE |
| 772 | |
| 773 | p = obj.Appendp(ctxt, p) |
| 774 | p.As = ASUB |
| 775 | p.From.Type = obj.TYPE_REG |
| 776 | p.From.Reg = REG_R1 |
| 777 | p.To.Type = obj.TYPE_REG |
| 778 | p.To.Reg = REG_R2 |
| 779 | p.Scond = C_SCOND_NE |
| 780 | |
| 781 | p = obj.Appendp(ctxt, p) |
| 782 | p.As = AMOVW |
| 783 | p.From.Type = obj.TYPE_ADDR |
| 784 | p.From.Offset = int64(framesize) + (obj.StackGuard - obj.StackSmall) |
| 785 | p.To.Type = obj.TYPE_REG |
| 786 | p.To.Reg = REG_R3 |
| 787 | p.Scond = C_SCOND_NE |
| 788 | |
| 789 | p = obj.Appendp(ctxt, p) |
| 790 | p.As = ACMP |
| 791 | p.From.Type = obj.TYPE_REG |
| 792 | p.From.Reg = REG_R3 |
| 793 | p.Reg = REG_R2 |
| 794 | p.Scond = C_SCOND_NE |
| 795 | } |
| 796 | |
| 797 | // BLS call-to-morestack |
| 798 | bls := obj.Appendp(ctxt, p) |
| 799 | bls.As = ABLS |
| 800 | bls.To.Type = obj.TYPE_BRANCH |
| 801 | |
| 802 | var last *obj.Prog |
| 803 | for last = ctxt.Cursym.Text; last.Link != nil; last = last.Link { |
| 804 | } |
| 805 | |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 806 | // Now we are at the end of the function, but logically |
| 807 | // we are still in function prologue. We need to fix the |
| 808 | // SP data and PCDATA. |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 809 | spfix := obj.Appendp(ctxt, last) |
| 810 | spfix.As = obj.ANOP |
| 811 | spfix.Spadj = -framesize |
| 812 | |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 813 | pcdata := obj.Appendp(ctxt, spfix) |
| 814 | pcdata.Lineno = ctxt.Cursym.Text.Lineno |
| 815 | pcdata.Mode = ctxt.Cursym.Text.Mode |
| 816 | pcdata.As = obj.APCDATA |
| 817 | pcdata.From.Type = obj.TYPE_CONST |
| 818 | pcdata.From.Offset = obj.PCDATA_StackMapIndex |
| 819 | pcdata.To.Type = obj.TYPE_CONST |
| 820 | pcdata.To.Offset = -1 // pcdata starts at -1 at function entry |
| 821 | |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 822 | // MOVW LR, R3 |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 823 | movw := obj.Appendp(ctxt, pcdata) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 824 | movw.As = AMOVW |
| 825 | movw.From.Type = obj.TYPE_REG |
| 826 | movw.From.Reg = REGLINK |
| 827 | movw.To.Type = obj.TYPE_REG |
| 828 | movw.To.Reg = REG_R3 |
| 829 | |
| 830 | bls.Pcond = movw |
| 831 | |
| 832 | // BL runtime.morestack |
| 833 | call := obj.Appendp(ctxt, movw) |
| 834 | call.As = obj.ACALL |
| 835 | call.To.Type = obj.TYPE_BRANCH |
| 836 | morestack := "runtime.morestack" |
| 837 | switch { |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame^] | 838 | case ctxt.Cursym.CFunc(): |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 839 | morestack = "runtime.morestackc" |
| 840 | case ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0: |
| 841 | morestack = "runtime.morestack_noctxt" |
| 842 | } |
| 843 | call.To.Sym = obj.Linklookup(ctxt, morestack, 0) |
| 844 | |
| 845 | // B start |
| 846 | b := obj.Appendp(ctxt, call) |
| 847 | b.As = obj.AJMP |
| 848 | b.To.Type = obj.TYPE_BRANCH |
| 849 | b.Pcond = ctxt.Cursym.Text.Link |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 850 | b.Spadj = +framesize |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 851 | |
| 852 | return bls |
| 853 | } |
| 854 | |
| 855 | func initdiv(ctxt *obj.Link) { |
| 856 | if ctxt.Sym_div != nil { |
| 857 | return |
| 858 | } |
| 859 | ctxt.Sym_div = obj.Linklookup(ctxt, "_div", 0) |
| 860 | ctxt.Sym_divu = obj.Linklookup(ctxt, "_divu", 0) |
| 861 | ctxt.Sym_mod = obj.Linklookup(ctxt, "_mod", 0) |
| 862 | ctxt.Sym_modu = obj.Linklookup(ctxt, "_modu", 0) |
| 863 | } |
| 864 | |
| 865 | func follow(ctxt *obj.Link, s *obj.LSym) { |
| 866 | ctxt.Cursym = s |
| 867 | |
| 868 | firstp := ctxt.NewProg() |
| 869 | lastp := firstp |
| 870 | xfol(ctxt, s.Text, &lastp) |
| 871 | lastp.Link = nil |
| 872 | s.Text = firstp.Link |
| 873 | } |
| 874 | |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 875 | func relinv(a obj.As) obj.As { |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 876 | switch a { |
| 877 | case ABEQ: |
| 878 | return ABNE |
| 879 | case ABNE: |
| 880 | return ABEQ |
| 881 | case ABCS: |
| 882 | return ABCC |
| 883 | case ABHS: |
| 884 | return ABLO |
| 885 | case ABCC: |
| 886 | return ABCS |
| 887 | case ABLO: |
| 888 | return ABHS |
| 889 | case ABMI: |
| 890 | return ABPL |
| 891 | case ABPL: |
| 892 | return ABMI |
| 893 | case ABVS: |
| 894 | return ABVC |
| 895 | case ABVC: |
| 896 | return ABVS |
| 897 | case ABHI: |
| 898 | return ABLS |
| 899 | case ABLS: |
| 900 | return ABHI |
| 901 | case ABGE: |
| 902 | return ABLT |
| 903 | case ABLT: |
| 904 | return ABGE |
| 905 | case ABGT: |
| 906 | return ABLE |
| 907 | case ABLE: |
| 908 | return ABGT |
| 909 | } |
| 910 | |
| 911 | log.Fatalf("unknown relation: %s", Anames[a]) |
| 912 | return 0 |
| 913 | } |
| 914 | |
| 915 | func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) { |
| 916 | var q *obj.Prog |
| 917 | var r *obj.Prog |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 918 | var i int |
| 919 | |
| 920 | loop: |
| 921 | if p == nil { |
| 922 | return |
| 923 | } |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 924 | a := p.As |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 925 | if a == AB { |
| 926 | q = p.Pcond |
| 927 | if q != nil && q.As != obj.ATEXT { |
| 928 | p.Mark |= FOLL |
| 929 | p = q |
| 930 | if p.Mark&FOLL == 0 { |
| 931 | goto loop |
| 932 | } |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | if p.Mark&FOLL != 0 { |
| 937 | i = 0 |
| 938 | q = p |
| 939 | for ; i < 4; i, q = i+1, q.Link { |
| 940 | if q == *last || q == nil { |
| 941 | break |
| 942 | } |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 943 | a = q.As |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 944 | if a == obj.ANOP { |
| 945 | i-- |
| 946 | continue |
| 947 | } |
| 948 | |
| 949 | if a == AB || (a == obj.ARET && q.Scond == C_SCOND_NONE) || a == ARFE || a == obj.AUNDEF { |
| 950 | goto copy |
| 951 | } |
| 952 | if q.Pcond == nil || (q.Pcond.Mark&FOLL != 0) { |
| 953 | continue |
| 954 | } |
| 955 | if a != ABEQ && a != ABNE { |
| 956 | continue |
| 957 | } |
| 958 | |
| 959 | copy: |
| 960 | for { |
| 961 | r = ctxt.NewProg() |
| 962 | *r = *p |
| 963 | if r.Mark&FOLL == 0 { |
| 964 | fmt.Printf("can't happen 1\n") |
| 965 | } |
| 966 | r.Mark |= FOLL |
| 967 | if p != q { |
| 968 | p = p.Link |
| 969 | (*last).Link = r |
| 970 | *last = r |
| 971 | continue |
| 972 | } |
| 973 | |
| 974 | (*last).Link = r |
| 975 | *last = r |
| 976 | if a == AB || (a == obj.ARET && q.Scond == C_SCOND_NONE) || a == ARFE || a == obj.AUNDEF { |
| 977 | return |
| 978 | } |
| 979 | r.As = ABNE |
| 980 | if a == ABNE { |
| 981 | r.As = ABEQ |
| 982 | } |
| 983 | r.Pcond = p.Link |
| 984 | r.Link = p.Pcond |
| 985 | if r.Link.Mark&FOLL == 0 { |
| 986 | xfol(ctxt, r.Link, last) |
| 987 | } |
| 988 | if r.Pcond.Mark&FOLL == 0 { |
| 989 | fmt.Printf("can't happen 2\n") |
| 990 | } |
| 991 | return |
| 992 | } |
| 993 | } |
| 994 | |
| 995 | a = AB |
| 996 | q = ctxt.NewProg() |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 997 | q.As = a |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 998 | q.Lineno = p.Lineno |
| 999 | q.To.Type = obj.TYPE_BRANCH |
| 1000 | q.To.Offset = p.Pc |
| 1001 | q.Pcond = p |
| 1002 | p = q |
| 1003 | } |
| 1004 | |
| 1005 | p.Mark |= FOLL |
| 1006 | (*last).Link = p |
| 1007 | *last = p |
| 1008 | if a == AB || (a == obj.ARET && p.Scond == C_SCOND_NONE) || a == ARFE || a == obj.AUNDEF { |
| 1009 | return |
| 1010 | } |
| 1011 | |
| 1012 | if p.Pcond != nil { |
| 1013 | if a != ABL && a != ABX && p.Link != nil { |
| 1014 | q = obj.Brchain(ctxt, p.Link) |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 1015 | if a != obj.ATEXT { |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 1016 | if q != nil && (q.Mark&FOLL != 0) { |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 1017 | p.As = relinv(a) |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 1018 | p.Link = p.Pcond |
| 1019 | p.Pcond = q |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | xfol(ctxt, p.Link, last) |
| 1024 | q = obj.Brchain(ctxt, p.Pcond) |
| 1025 | if q == nil { |
| 1026 | q = p.Pcond |
| 1027 | } |
| 1028 | if q.Mark&FOLL != 0 { |
| 1029 | p.Pcond = q |
| 1030 | return |
| 1031 | } |
| 1032 | |
| 1033 | p = q |
| 1034 | goto loop |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | p = p.Link |
| 1039 | goto loop |
| 1040 | } |
| 1041 | |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 1042 | var unaryDst = map[obj.As]bool{ |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 1043 | ASWI: true, |
| 1044 | AWORD: true, |
| 1045 | } |
| 1046 | |
| 1047 | var Linkarm = obj.LinkArch{ |
Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 1048 | Arch: sys.ArchARM, |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 1049 | Preprocess: preprocess, |
| 1050 | Assemble: span5, |
| 1051 | Follow: follow, |
| 1052 | Progedit: progedit, |
| 1053 | UnaryDst: unaryDst, |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 1054 | } |