arch/mips/mm/uasm.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * A small micro-assembler. It is intentionally kept simple, does only
   7  * support a subset of instructions, and does not try to hide pipeline
   8  * effects like branch delay slots.
   9  *
  10  * Copyright (C) 2004, 2005, 2006, 2008  Thiemo Seufer
  11  * Copyright (C) 2005, 2007  Maciej W. Rozycki
  12  * Copyright (C) 2006  Ralf Baechle (ralf@linux-mips.org)
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/inst.h>
  20 #include <asm/elf.h>
  21 #include <asm/bugs.h>
  22
  23 #include "uasm.h"
  24
  25 enum fields {
  26         RS = 0x001,
  27         RT = 0x002,
  28         RD = 0x004,
  29         RE = 0x008,
  30         SIMM = 0x010,
  31         UIMM = 0x020,
  32         BIMM = 0x040,
  33         JIMM = 0x080,
  34         FUNC = 0x100,
  35         SET = 0x200
  36 };
  37
  38 #define OP_MASK         0x3f
  39 #define OP_SH           26
  40 #define RS_MASK         0x1f
  41 #define RS_SH           21
  42 #define RT_MASK         0x1f
  43 #define RT_SH           16
  44 #define RD_MASK         0x1f
  45 #define RD_SH           11
  46 #define RE_MASK         0x1f
  47 #define RE_SH           6
  48 #define IMM_MASK        0xffff
  49 #define IMM_SH          0
  50 #define JIMM_MASK       0x3ffffff
  51 #define JIMM_SH         0
  52 #define FUNC_MASK       0x3f
  53 #define FUNC_SH         0
  54 #define SET_MASK        0x7
  55 #define SET_SH          0
  56
  57 enum opcode {
  58         insn_invalid,
  59         insn_addu, insn_addiu, insn_and, insn_andi, insn_beq,
  60         insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
  61         insn_bne, insn_daddu, insn_daddiu, insn_dmfc0, insn_dmtc0,
  62         insn_dsll, insn_dsll32, insn_dsra, insn_dsrl, insn_dsrl32,
  63         insn_dsubu, insn_eret, insn_j, insn_jal, insn_jr, insn_ld,
  64         insn_ll, insn_lld, insn_lui, insn_lw, insn_mfc0, insn_mtc0,
  65         insn_ori, insn_rfe, insn_sc, insn_scd, insn_sd, insn_sll,
  66         insn_sra, insn_srl, insn_subu, insn_sw, insn_tlbp, insn_tlbwi,
  67         insn_tlbwr, insn_xor, insn_xori
  68 };
  69
  70 struct insn {
  71         enum opcode opcode;
  72         u32 match;
  73         enum fields fields;
  74 };
  75
  76 /* This macro sets the non-variable bits of an instruction. */
  77 #define M(a, b, c, d, e, f)                                     \
  78         ((a) << OP_SH                                           \
  79          | (b) << RS_SH                                         \
  80          | (c) << RT_SH                                         \
  81          | (d) << RD_SH                                         \
  82          | (e) << RE_SH                                         \
  83          | (f) << FUNC_SH)
  84
  85 static struct insn insn_table[] __initdata = {
  86         { insn_addiu, M(addiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM },
  87         { insn_addu, M(spec_op, 0, 0, 0, 0, addu_op), RS | RT | RD },
  88         { insn_and, M(spec_op, 0, 0, 0, 0, and_op), RS | RT | RD },
  89         { insn_andi, M(andi_op, 0, 0, 0, 0, 0), RS | RT | UIMM },
  90         { insn_beq, M(beq_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
  91         { insn_beql, M(beql_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
  92         { insn_bgez, M(bcond_op, 0, bgez_op, 0, 0, 0), RS | BIMM },
  93         { insn_bgezl, M(bcond_op, 0, bgezl_op, 0, 0, 0), RS | BIMM },
  94         { insn_bltz, M(bcond_op, 0, bltz_op, 0, 0, 0), RS | BIMM },
  95         { insn_bltzl, M(bcond_op, 0, bltzl_op, 0, 0, 0), RS | BIMM },
  96         { insn_bne, M(bne_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
  97         { insn_daddiu, M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM },
  98         { insn_daddu, M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD },
  99         { insn_dmfc0, M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET},
 100         { insn_dmtc0, M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET},
 101         { insn_dsll, M(spec_op, 0, 0, 0, 0, dsll_op), RT | RD | RE },
 102         { insn_dsll32, M(spec_op, 0, 0, 0, 0, dsll32_op), RT | RD | RE },
 103         { insn_dsra, M(spec_op, 0, 0, 0, 0, dsra_op), RT | RD | RE },
 104         { insn_dsrl, M(spec_op, 0, 0, 0, 0, dsrl_op), RT | RD | RE },
 105         { insn_dsrl32, M(spec_op, 0, 0, 0, 0, dsrl32_op), RT | RD | RE },
 106         { insn_dsubu, M(spec_op, 0, 0, 0, 0, dsubu_op), RS | RT | RD },
 107         { insn_eret,  M(cop0_op, cop_op, 0, 0, 0, eret_op),  0 },
 108         { insn_j,  M(j_op, 0, 0, 0, 0, 0),  JIMM },
 109         { insn_jal,  M(jal_op, 0, 0, 0, 0, 0),  JIMM },
 110         { insn_jr,  M(spec_op, 0, 0, 0, 0, jr_op),  RS },
 111         { insn_ld,  M(ld_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 112         { insn_ll,  M(ll_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 113         { insn_lld,  M(lld_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 114         { insn_lui,  M(lui_op, 0, 0, 0, 0, 0),  RT | SIMM },
 115         { insn_lw,  M(lw_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 116         { insn_mfc0,  M(cop0_op, mfc_op, 0, 0, 0, 0),  RT | RD | SET},
 117         { insn_mtc0,  M(cop0_op, mtc_op, 0, 0, 0, 0),  RT | RD | SET},
 118         { insn_ori,  M(ori_op, 0, 0, 0, 0, 0),  RS | RT | UIMM },
 119         { insn_rfe,  M(cop0_op, cop_op, 0, 0, 0, rfe_op),  0 },
 120         { insn_sc,  M(sc_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 121         { insn_scd,  M(scd_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 122         { insn_sd,  M(sd_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 123         { insn_sll,  M(spec_op, 0, 0, 0, 0, sll_op),  RT | RD | RE },
 124         { insn_sra,  M(spec_op, 0, 0, 0, 0, sra_op),  RT | RD | RE },
 125         { insn_srl,  M(spec_op, 0, 0, 0, 0, srl_op),  RT | RD | RE },
 126         { insn_subu,  M(spec_op, 0, 0, 0, 0, subu_op),  RS | RT | RD },
 127         { insn_sw,  M(sw_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
 128         { insn_tlbp,  M(cop0_op, cop_op, 0, 0, 0, tlbp_op),  0 },
 129         { insn_tlbwi,  M(cop0_op, cop_op, 0, 0, 0, tlbwi_op),  0 },
 130         { insn_tlbwr,  M(cop0_op, cop_op, 0, 0, 0, tlbwr_op),  0 },
 131         { insn_xor,  M(spec_op, 0, 0, 0, 0, xor_op),  RS | RT | RD },
 132         { insn_xori,  M(xori_op, 0, 0, 0, 0, 0),  RS | RT | UIMM },
 133         { insn_invalid, 0, 0 }
 134 };
 135
 136 #undef M
 137
 138 static inline __init u32 build_rs(u32 arg)
 139 {
 140         if (arg & ~RS_MASK)
 141                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 142
 143         return (arg & RS_MASK) << RS_SH;
 144 }
 145
 146 static inline __init u32 build_rt(u32 arg)
 147 {
 148         if (arg & ~RT_MASK)
 149                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 150
 151         return (arg & RT_MASK) << RT_SH;
 152 }
 153
 154 static inline __init u32 build_rd(u32 arg)
 155 {
 156         if (arg & ~RD_MASK)
 157                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 158
 159         return (arg & RD_MASK) << RD_SH;
 160 }
 161
 162 static inline __init u32 build_re(u32 arg)
 163 {
 164         if (arg & ~RE_MASK)
 165                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 166
 167         return (arg & RE_MASK) << RE_SH;
 168 }
 169
 170 static inline __init u32 build_simm(s32 arg)
 171 {
 172         if (arg > 0x7fff || arg < -0x8000)
 173                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 174
 175         return arg & 0xffff;
 176 }
 177
 178 static inline __init u32 build_uimm(u32 arg)
 179 {
 180         if (arg & ~IMM_MASK)
 181                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 182
 183         return arg & IMM_MASK;
 184 }
 185
 186 static inline __init u32 build_bimm(s32 arg)
 187 {
 188         if (arg > 0x1ffff || arg < -0x20000)
 189                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 190
 191         if (arg & 0x3)
 192                 printk(KERN_WARNING "Invalid micro-assembler branch target\n");
 193
 194         return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 2) & 0x7fff);
 195 }
 196
 197 static inline __init u32 build_jimm(u32 arg)
 198 {
 199         if (arg & ~((JIMM_MASK) << 2))
 200                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 201
 202         return (arg >> 2) & JIMM_MASK;
 203 }
 204
 205 static inline __init u32 build_func(u32 arg)
 206 {
 207         if (arg & ~FUNC_MASK)
 208                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 209
 210         return arg & FUNC_MASK;
 211 }
 212
 213 static inline __init u32 build_set(u32 arg)
 214 {
 215         if (arg & ~SET_MASK)
 216                 printk(KERN_WARNING "Micro-assembler field overflow\n");
 217
 218         return arg & SET_MASK;
 219 }
 220
 221 /*
 222  * The order of opcode arguments is implicitly left to right,
 223  * starting with RS and ending with FUNC or IMM.
 224  */
 225 static void __init build_insn(u32 **buf, enum opcode opc, ...)
 226 {
 227         struct insn *ip = NULL;
 228         unsigned int i;
 229         va_list ap;
 230         u32 op;
 231
 232         for (i = 0; insn_table[i].opcode != insn_invalid; i++)
 233                 if (insn_table[i].opcode == opc) {
 234                         ip = &insn_table[i];
 235                         break;
 236                 }
 237
 238         if (!ip || (opc == insn_daddiu && r4k_daddiu_bug()))
 239                 panic("Unsupported Micro-assembler instruction %d", opc);
 240
 241         op = ip->match;
 242         va_start(ap, opc);
 243         if (ip->fields & RS)
 244                 op |= build_rs(va_arg(ap, u32));
 245         if (ip->fields & RT)
 246                 op |= build_rt(va_arg(ap, u32));
 247         if (ip->fields & RD)
 248                 op |= build_rd(va_arg(ap, u32));
 249         if (ip->fields & RE)
 250                 op |= build_re(va_arg(ap, u32));
 251         if (ip->fields & SIMM)
 252                 op |= build_simm(va_arg(ap, s32));
 253         if (ip->fields & UIMM)
 254                 op |= build_uimm(va_arg(ap, u32));
 255         if (ip->fields & BIMM)
 256                 op |= build_bimm(va_arg(ap, s32));
 257         if (ip->fields & JIMM)
 258                 op |= build_jimm(va_arg(ap, u32));
 259         if (ip->fields & FUNC)
 260                 op |= build_func(va_arg(ap, u32));
 261         if (ip->fields & SET)
 262                 op |= build_set(va_arg(ap, u32));
 263         va_end(ap);
 264
 265         **buf = op;
 266         (*buf)++;
 267 }
 268
 269 #define I_u1u2u3(op)                                    \
 270 Ip_u1u2u3(op)                                           \
 271 {                                                       \
 272         build_insn(buf, insn##op, a, b, c);             \
 273 }
 274
 275 #define I_u2u1u3(op)                                    \
 276 Ip_u2u1u3(op)                                           \
 277 {                                                       \
 278         build_insn(buf, insn##op, b, a, c);             \
 279 }
 280
 281 #define I_u3u1u2(op)                                    \
 282 Ip_u3u1u2(op)                                           \
 283 {                                                       \
 284         build_insn(buf, insn##op, b, c, a);             \
 285 }
 286
 287 #define I_u1u2s3(op)                                    \
 288 Ip_u1u2s3(op)                                           \
 289 {                                                       \
 290         build_insn(buf, insn##op, a, b, c);             \
 291 }
 292
 293 #define I_u2s3u1(op)                                    \
 294 Ip_u2s3u1(op)                                           \
 295 {                                                       \
 296         build_insn(buf, insn##op, c, a, b);             \
 297 }
 298
 299 #define I_u2u1s3(op)                                    \
 300 Ip_u2u1s3(op)                                           \
 301 {                                                       \
 302         build_insn(buf, insn##op, b, a, c);             \
 303 }
 304
 305 #define I_u1u2(op)                                      \
 306 Ip_u1u2(op)                                             \
 307 {                                                       \
 308         build_insn(buf, insn##op, a, b);                \
 309 }
 310
 311 #define I_u1s2(op)                                      \
 312 Ip_u1s2(op)                                             \
 313 {                                                       \
 314         build_insn(buf, insn##op, a, b);                \
 315 }
 316
 317 #define I_u1(op)                                        \
 318 Ip_u1(op)                                               \
 319 {                                                       \
 320         build_insn(buf, insn##op, a);                   \
 321 }
 322
 323 #define I_0(op)                                         \
 324 Ip_0(op)                                                \
 325 {                                                       \
 326         build_insn(buf, insn##op);                      \
 327 }
 328
 329 I_u2u1s3(_addiu)
 330 I_u3u1u2(_addu)
 331 I_u2u1u3(_andi)
 332 I_u3u1u2(_and)
 333 I_u1u2s3(_beq)
 334 I_u1u2s3(_beql)
 335 I_u1s2(_bgez)
 336 I_u1s2(_bgezl)
 337 I_u1s2(_bltz)
 338 I_u1s2(_bltzl)
 339 I_u1u2s3(_bne)
 340 I_u1u2u3(_dmfc0)
 341 I_u1u2u3(_dmtc0)
 342 I_u2u1s3(_daddiu)
 343 I_u3u1u2(_daddu)
 344 I_u2u1u3(_dsll)
 345 I_u2u1u3(_dsll32)
 346 I_u2u1u3(_dsra)
 347 I_u2u1u3(_dsrl)
 348 I_u2u1u3(_dsrl32)
 349 I_u3u1u2(_dsubu)
 350 I_0(_eret)
 351 I_u1(_j)
 352 I_u1(_jal)
 353 I_u1(_jr)
 354 I_u2s3u1(_ld)
 355 I_u2s3u1(_ll)
 356 I_u2s3u1(_lld)
 357 I_u1s2(_lui)
 358 I_u2s3u1(_lw)
 359 I_u1u2u3(_mfc0)
 360 I_u1u2u3(_mtc0)
 361 I_u2u1u3(_ori)
 362 I_0(_rfe)
 363 I_u2s3u1(_sc)
 364 I_u2s3u1(_scd)
 365 I_u2s3u1(_sd)
 366 I_u2u1u3(_sll)
 367 I_u2u1u3(_sra)
 368 I_u2u1u3(_srl)
 369 I_u3u1u2(_subu)
 370 I_u2s3u1(_sw)
 371 I_0(_tlbp)
 372 I_0(_tlbwi)
 373 I_0(_tlbwr)
 374 I_u3u1u2(_xor)
 375 I_u2u1u3(_xori)
 376
 377 /* Handle labels. */
 378 void __init uasm_build_label(struct uasm_label **lab, u32 *addr, int lid)
 379 {
 380         (*lab)->addr = addr;
 381         (*lab)->lab = lid;
 382         (*lab)++;
 383 }
 384
 385 int __init uasm_in_compat_space_p(long addr)
 386 {
 387         /* Is this address in 32bit compat space? */
 388 #ifdef CONFIG_64BIT
 389         return (((addr) & 0xffffffff00000000L) == 0xffffffff00000000L);
 390 #else
 391         return 1;
 392 #endif
 393 }
 394
 395 int __init uasm_rel_highest(long val)
 396 {
 397 #ifdef CONFIG_64BIT
 398         return ((((val + 0x800080008000L) >> 48) & 0xffff) ^ 0x8000) - 0x8000;
 399 #else
 400         return 0;
 401 #endif
 402 }
 403
 404 int __init uasm_rel_higher(long val)
 405 {
 406 #ifdef CONFIG_64BIT
 407         return ((((val + 0x80008000L) >> 32) & 0xffff) ^ 0x8000) - 0x8000;
 408 #else
 409         return 0;
 410 #endif
 411 }
 412
 413 int __init uasm_rel_hi(long val)
 414 {
 415         return ((((val + 0x8000L) >> 16) & 0xffff) ^ 0x8000) - 0x8000;
 416 }
 417
 418 int __init uasm_rel_lo(long val)
 419 {
 420         return ((val & 0xffff) ^ 0x8000) - 0x8000;
 421 }
 422
 423 void __init UASM_i_LA_mostly(u32 **buf, unsigned int rs, long addr)
 424 {
 425         if (!uasm_in_compat_space_p(addr)) {
 426                 uasm_i_lui(buf, rs, uasm_rel_highest(addr));
 427                 if (uasm_rel_higher(addr))
 428                         uasm_i_daddiu(buf, rs, rs, uasm_rel_higher(addr));
 429                 if (uasm_rel_hi(addr)) {
 430                         uasm_i_dsll(buf, rs, rs, 16);
 431                         uasm_i_daddiu(buf, rs, rs, uasm_rel_hi(addr));
 432                         uasm_i_dsll(buf, rs, rs, 16);
 433                 } else
 434                         uasm_i_dsll32(buf, rs, rs, 0);
 435         } else
 436                 uasm_i_lui(buf, rs, uasm_rel_hi(addr));
 437 }
 438
 439 void __init UASM_i_LA(u32 **buf, unsigned int rs, long addr)
 440 {
 441         UASM_i_LA_mostly(buf, rs, addr);
 442         if (uasm_rel_lo(addr)) {
 443                 if (!uasm_in_compat_space_p(addr))
 444                         uasm_i_daddiu(buf, rs, rs, uasm_rel_lo(addr));
 445                 else
 446                         uasm_i_addiu(buf, rs, rs, uasm_rel_lo(addr));
 447         }
 448 }
 449
 450 /* Handle relocations. */
 451 void __init
 452 uasm_r_mips_pc16(struct uasm_reloc **rel, u32 *addr, int lid)
 453 {
 454         (*rel)->addr = addr;
 455         (*rel)->type = R_MIPS_PC16;
 456         (*rel)->lab = lid;
 457         (*rel)++;
 458 }
 459
 460 static inline void __init
 461 __resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab)
 462 {
 463         long laddr = (long)lab->addr;
 464         long raddr = (long)rel->addr;
 465
 466         switch (rel->type) {
 467         case R_MIPS_PC16:
 468                 *rel->addr |= build_bimm(laddr - (raddr + 4));
 469                 break;
 470
 471         default:
 472                 panic("Unsupported Micro-assembler relocation %d",
 473                       rel->type);
 474         }
 475 }
 476
 477 void __init
 478 uasm_resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab)
 479 {
 480         struct uasm_label *l;
 481
 482         for (; rel->lab != UASM_LABEL_INVALID; rel++)
 483                 for (l = lab; l->lab != UASM_LABEL_INVALID; l++)
 484                         if (rel->lab == l->lab)
 485                                 __resolve_relocs(rel, l);
 486 }
 487
 488 void __init
 489 uasm_move_relocs(struct uasm_reloc *rel, u32 *first, u32 *end, long off)
 490 {
 491         for (; rel->lab != UASM_LABEL_INVALID; rel++)
 492                 if (rel->addr >= first && rel->addr < end)
 493                         rel->addr += off;
 494 }
 495
 496 void __init
 497 uasm_move_labels(struct uasm_label *lab, u32 *first, u32 *end, long off)
 498 {
 499         for (; lab->lab != UASM_LABEL_INVALID; lab++)
 500                 if (lab->addr >= first && lab->addr < end)
 501                         lab->addr += off;
 502 }
 503
 504 void __init
 505 uasm_copy_handler(struct uasm_reloc *rel, struct uasm_label *lab, u32 *first,
 506                   u32 *end, u32 *target)
 507 {
 508         long off = (long)(target - first);
 509
 510         memcpy(target, first, (end - first) * sizeof(u32));
 511
 512         uasm_move_relocs(rel, first, end, off);
 513         uasm_move_labels(lab, first, end, off);
 514 }
 515
 516 int __init uasm_insn_has_bdelay(struct uasm_reloc *rel, u32 *addr)
 517 {
 518         for (; rel->lab != UASM_LABEL_INVALID; rel++) {
 519                 if (rel->addr == addr
 520                     && (rel->type == R_MIPS_PC16
 521                         || rel->type == R_MIPS_26))
 522                         return 1;
 523         }
 524
 525         return 0;
 526 }
 527
 528 /* Convenience functions for labeled branches. */
 529 void __init
 530 uasm_il_bltz(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 531 {
 532         uasm_r_mips_pc16(r, *p, lid);
 533         uasm_i_bltz(p, reg, 0);
 534 }
 535
 536 void __init
 537 uasm_il_b(u32 **p, struct uasm_reloc **r, int lid)
 538 {
 539         uasm_r_mips_pc16(r, *p, lid);
 540         uasm_i_b(p, 0);
 541 }
 542
 543 void __init
 544 uasm_il_beqz(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 545 {
 546         uasm_r_mips_pc16(r, *p, lid);
 547         uasm_i_beqz(p, reg, 0);
 548 }
 549
 550 void __init
 551 uasm_il_beqzl(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 552 {
 553         uasm_r_mips_pc16(r, *p, lid);
 554         uasm_i_beqzl(p, reg, 0);
 555 }
 556
 557 void __init
 558 uasm_il_bnez(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 559 {
 560         uasm_r_mips_pc16(r, *p, lid);
 561         uasm_i_bnez(p, reg, 0);
 562 }
 563
 564 void __init
 565 uasm_il_bgezl(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 566 {
 567         uasm_r_mips_pc16(r, *p, lid);
 568         uasm_i_bgezl(p, reg, 0);
 569 }
 570
 571 void __init
 572 uasm_il_bgez(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 573 {
 574         uasm_r_mips_pc16(r, *p, lid);
 575         uasm_i_bgez(p, reg, 0);
 576 }