tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * Copyright (C) 2012, 2013 MIPS Technologies, Inc. All rights reserved.
14 */
15
16enum fields {
17 RS = 0x001,
18 RT = 0x002,
19 RD = 0x004,
20 RE = 0x008,
21 SIMM = 0x010,
22 UIMM = 0x020,
23 BIMM = 0x040,
24 JIMM = 0x080,
25 FUNC = 0x100,
26 SET = 0x200,
27 SCIMM = 0x400,
28 SIMM9 = 0x800,
29};
30
31#define OP_MASK 0x3f
32#define OP_SH 26
33#define RD_MASK 0x1f
34#define RD_SH 11
35#define RE_MASK 0x1f
36#define RE_SH 6
37#define IMM_MASK 0xffff
38#define IMM_SH 0
39#define JIMM_MASK 0x3ffffff
40#define JIMM_SH 0
41#define FUNC_MASK 0x3f
42#define FUNC_SH 0
43#define SET_MASK 0x7
44#define SET_SH 0
45#define SIMM9_SH 7
46#define SIMM9_MASK 0x1ff
47
48enum opcode {
49 insn_invalid,
50 insn_addiu, insn_addu, insn_and, insn_andi, insn_bbit0, insn_bbit1,
51 insn_beq, insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
52 insn_bne, insn_cache, insn_cfc1, insn_cfcmsa, insn_ctc1, insn_ctcmsa,
53 insn_daddiu, insn_daddu, insn_di, insn_dins, insn_dinsm, insn_divu,
54 insn_dmfc0, insn_dmtc0, insn_drotr, insn_drotr32, insn_dsll,
55 insn_dsll32, insn_dsra, insn_dsrl, insn_dsrl32, insn_dsubu, insn_eret,
56 insn_ext, insn_ins, insn_j, insn_jal, insn_jalr, insn_jr, insn_lb,
57 insn_ld, insn_ldx, insn_lh, insn_ll, insn_lld, insn_lui, insn_lw,
58 insn_lwx, insn_mfc0, insn_mfhc0, insn_mfhi, insn_mflo, insn_mtc0,
59 insn_mthc0, insn_mthi, insn_mtlo, insn_mul, insn_or, insn_ori,
60 insn_pref, insn_rfe, insn_rotr, insn_sc, insn_scd, insn_sd, insn_sll,
61 insn_sllv, insn_slt, insn_sltiu, insn_sltu, insn_sra, insn_srl,
62 insn_srlv, insn_subu, insn_sw, insn_sync, insn_syscall, insn_tlbp,
63 insn_tlbr, insn_tlbwi, insn_tlbwr, insn_wait, insn_wsbh, insn_xor,
64 insn_xori, insn_yield, insn_lddir, insn_ldpte,
65};
66
67struct insn {
68 enum opcode opcode;
69 u32 match;
70 enum fields fields;
71};
72
73static inline u32 build_rs(u32 arg)
74{
75 WARN(arg & ~RS_MASK, KERN_WARNING "Micro-assembler field overflow\n");
76
77 return (arg & RS_MASK) << RS_SH;
78}
79
80static inline u32 build_rt(u32 arg)
81{
82 WARN(arg & ~RT_MASK, KERN_WARNING "Micro-assembler field overflow\n");
83
84 return (arg & RT_MASK) << RT_SH;
85}
86
87static inline u32 build_rd(u32 arg)
88{
89 WARN(arg & ~RD_MASK, KERN_WARNING "Micro-assembler field overflow\n");
90
91 return (arg & RD_MASK) << RD_SH;
92}
93
94static inline u32 build_re(u32 arg)
95{
96 WARN(arg & ~RE_MASK, KERN_WARNING "Micro-assembler field overflow\n");
97
98 return (arg & RE_MASK) << RE_SH;
99}
100
101static inline u32 build_simm(s32 arg)
102{
103 WARN(arg > 0x7fff || arg < -0x8000,
104 KERN_WARNING "Micro-assembler field overflow\n");
105
106 return arg & 0xffff;
107}
108
109static inline u32 build_uimm(u32 arg)
110{
111 WARN(arg & ~IMM_MASK, KERN_WARNING "Micro-assembler field overflow\n");
112
113 return arg & IMM_MASK;
114}
115
116static inline u32 build_scimm(u32 arg)
117{
118 WARN(arg & ~SCIMM_MASK,
119 KERN_WARNING "Micro-assembler field overflow\n");
120
121 return (arg & SCIMM_MASK) << SCIMM_SH;
122}
123
124static inline u32 build_scimm9(s32 arg)
125{
126 WARN((arg > 0xff || arg < -0x100),
127 KERN_WARNING "Micro-assembler field overflow\n");
128
129 return (arg & SIMM9_MASK) << SIMM9_SH;
130}
131
132static inline u32 build_func(u32 arg)
133{
134 WARN(arg & ~FUNC_MASK, KERN_WARNING "Micro-assembler field overflow\n");
135
136 return arg & FUNC_MASK;
137}
138
139static inline u32 build_set(u32 arg)
140{
141 WARN(arg & ~SET_MASK, KERN_WARNING "Micro-assembler field overflow\n");
142
143 return arg & SET_MASK;
144}
145
146static void build_insn(u32 **buf, enum opcode opc, ...);
147
148#define I_u1u2u3(op) \
149Ip_u1u2u3(op) \
150{ \
151 build_insn(buf, insn##op, a, b, c); \
152} \
153UASM_EXPORT_SYMBOL(uasm_i##op);
154
155#define I_s3s1s2(op) \
156Ip_s3s1s2(op) \
157{ \
158 build_insn(buf, insn##op, b, c, a); \
159} \
160UASM_EXPORT_SYMBOL(uasm_i##op);
161
162#define I_u2u1u3(op) \
163Ip_u2u1u3(op) \
164{ \
165 build_insn(buf, insn##op, b, a, c); \
166} \
167UASM_EXPORT_SYMBOL(uasm_i##op);
168
169#define I_u3u2u1(op) \
170Ip_u3u2u1(op) \
171{ \
172 build_insn(buf, insn##op, c, b, a); \
173} \
174UASM_EXPORT_SYMBOL(uasm_i##op);
175
176#define I_u3u1u2(op) \
177Ip_u3u1u2(op) \
178{ \
179 build_insn(buf, insn##op, b, c, a); \
180} \
181UASM_EXPORT_SYMBOL(uasm_i##op);
182
183#define I_u1u2s3(op) \
184Ip_u1u2s3(op) \
185{ \
186 build_insn(buf, insn##op, a, b, c); \
187} \
188UASM_EXPORT_SYMBOL(uasm_i##op);
189
190#define I_u2s3u1(op) \
191Ip_u2s3u1(op) \
192{ \
193 build_insn(buf, insn##op, c, a, b); \
194} \
195UASM_EXPORT_SYMBOL(uasm_i##op);
196
197#define I_u2u1s3(op) \
198Ip_u2u1s3(op) \
199{ \
200 build_insn(buf, insn##op, b, a, c); \
201} \
202UASM_EXPORT_SYMBOL(uasm_i##op);
203
204#define I_u2u1msbu3(op) \
205Ip_u2u1msbu3(op) \
206{ \
207 build_insn(buf, insn##op, b, a, c+d-1, c); \
208} \
209UASM_EXPORT_SYMBOL(uasm_i##op);
210
211#define I_u2u1msb32u3(op) \
212Ip_u2u1msbu3(op) \
213{ \
214 build_insn(buf, insn##op, b, a, c+d-33, c); \
215} \
216UASM_EXPORT_SYMBOL(uasm_i##op);
217
218#define I_u2u1msbdu3(op) \
219Ip_u2u1msbu3(op) \
220{ \
221 build_insn(buf, insn##op, b, a, d-1, c); \
222} \
223UASM_EXPORT_SYMBOL(uasm_i##op);
224
225#define I_u1u2(op) \
226Ip_u1u2(op) \
227{ \
228 build_insn(buf, insn##op, a, b); \
229} \
230UASM_EXPORT_SYMBOL(uasm_i##op);
231
232#define I_u2u1(op) \
233Ip_u1u2(op) \
234{ \
235 build_insn(buf, insn##op, b, a); \
236} \
237UASM_EXPORT_SYMBOL(uasm_i##op);
238
239#define I_u1s2(op) \
240Ip_u1s2(op) \
241{ \
242 build_insn(buf, insn##op, a, b); \
243} \
244UASM_EXPORT_SYMBOL(uasm_i##op);
245
246#define I_u1(op) \
247Ip_u1(op) \
248{ \
249 build_insn(buf, insn##op, a); \
250} \
251UASM_EXPORT_SYMBOL(uasm_i##op);
252
253#define I_0(op) \
254Ip_0(op) \
255{ \
256 build_insn(buf, insn##op); \
257} \
258UASM_EXPORT_SYMBOL(uasm_i##op);
259
260I_u2u1s3(_addiu)
261I_u3u1u2(_addu)
262I_u2u1u3(_andi)
263I_u3u1u2(_and)
264I_u1u2s3(_beq)
265I_u1u2s3(_beql)
266I_u1s2(_bgez)
267I_u1s2(_bgezl)
268I_u1s2(_bltz)
269I_u1s2(_bltzl)
270I_u1u2s3(_bne)
271I_u2s3u1(_cache)
272I_u1u2(_cfc1)
273I_u2u1(_cfcmsa)
274I_u1u2(_ctc1)
275I_u2u1(_ctcmsa)
276I_u1u2u3(_dmfc0)
277I_u1u2u3(_dmtc0)
278I_u2u1s3(_daddiu)
279I_u3u1u2(_daddu)
280I_u1(_di);
281I_u1u2(_divu)
282I_u2u1u3(_dsll)
283I_u2u1u3(_dsll32)
284I_u2u1u3(_dsra)
285I_u2u1u3(_dsrl)
286I_u2u1u3(_dsrl32)
287I_u2u1u3(_drotr)
288I_u2u1u3(_drotr32)
289I_u3u1u2(_dsubu)
290I_0(_eret)
291I_u2u1msbdu3(_ext)
292I_u2u1msbu3(_ins)
293I_u1(_j)
294I_u1(_jal)
295I_u2u1(_jalr)
296I_u1(_jr)
297I_u2s3u1(_lb)
298I_u2s3u1(_ld)
299I_u2s3u1(_lh)
300I_u2s3u1(_ll)
301I_u2s3u1(_lld)
302I_u1s2(_lui)
303I_u2s3u1(_lw)
304I_u1u2u3(_mfc0)
305I_u1u2u3(_mfhc0)
306I_u1(_mfhi)
307I_u1(_mflo)
308I_u1u2u3(_mtc0)
309I_u1u2u3(_mthc0)
310I_u1(_mthi)
311I_u1(_mtlo)
312I_u3u1u2(_mul)
313I_u2u1u3(_ori)
314I_u3u1u2(_or)
315I_0(_rfe)
316I_u2s3u1(_sc)
317I_u2s3u1(_scd)
318I_u2s3u1(_sd)
319I_u2u1u3(_sll)
320I_u3u2u1(_sllv)
321I_s3s1s2(_slt)
322I_u2u1s3(_sltiu)
323I_u3u1u2(_sltu)
324I_u2u1u3(_sra)
325I_u2u1u3(_srl)
326I_u3u2u1(_srlv)
327I_u2u1u3(_rotr)
328I_u3u1u2(_subu)
329I_u2s3u1(_sw)
330I_u1(_sync)
331I_0(_tlbp)
332I_0(_tlbr)
333I_0(_tlbwi)
334I_0(_tlbwr)
335I_u1(_wait);
336I_u2u1(_wsbh)
337I_u3u1u2(_xor)
338I_u2u1u3(_xori)
339I_u2u1(_yield)
340I_u2u1msbu3(_dins);
341I_u2u1msb32u3(_dinsm);
342I_u1(_syscall);
343I_u1u2s3(_bbit0);
344I_u1u2s3(_bbit1);
345I_u3u1u2(_lwx)
346I_u3u1u2(_ldx)
347I_u1u2(_ldpte)
348I_u2u1u3(_lddir)
349
350#ifdef CONFIG_CPU_CAVIUM_OCTEON
351#include <asm/octeon/octeon.h>
352void ISAFUNC(uasm_i_pref)(u32 **buf, unsigned int a, signed int b,
353 unsigned int c)
354{
355 if (CAVIUM_OCTEON_DCACHE_PREFETCH_WAR && a <= 24 && a != 5)
356 /*
357 * As per erratum Core-14449, replace prefetches 0-4,
358 * 6-24 with 'pref 28'.
359 */
360 build_insn(buf, insn_pref, c, 28, b);
361 else
362 build_insn(buf, insn_pref, c, a, b);
363}
364UASM_EXPORT_SYMBOL(ISAFUNC(uasm_i_pref));
365#else
366I_u2s3u1(_pref)
367#endif
368
369/* Handle labels. */
370void ISAFUNC(uasm_build_label)(struct uasm_label **lab, u32 *addr, int lid)
371{
372 (*lab)->addr = addr;
373 (*lab)->lab = lid;
374 (*lab)++;
375}
376UASM_EXPORT_SYMBOL(ISAFUNC(uasm_build_label));
377
378int ISAFUNC(uasm_in_compat_space_p)(long addr)
379{
380 /* Is this address in 32bit compat space? */
381 return addr == (int)addr;
382}
383UASM_EXPORT_SYMBOL(ISAFUNC(uasm_in_compat_space_p));
384
385static int uasm_rel_highest(long val)
386{
387#ifdef CONFIG_64BIT
388 return ((((val + 0x800080008000L) >> 48) & 0xffff) ^ 0x8000) - 0x8000;
389#else
390 return 0;
391#endif
392}
393
394static int uasm_rel_higher(long val)
395{
396#ifdef CONFIG_64BIT
397 return ((((val + 0x80008000L) >> 32) & 0xffff) ^ 0x8000) - 0x8000;
398#else
399 return 0;
400#endif
401}
402
403int ISAFUNC(uasm_rel_hi)(long val)
404{
405 return ((((val + 0x8000L) >> 16) & 0xffff) ^ 0x8000) - 0x8000;
406}
407UASM_EXPORT_SYMBOL(ISAFUNC(uasm_rel_hi));
408
409int ISAFUNC(uasm_rel_lo)(long val)
410{
411 return ((val & 0xffff) ^ 0x8000) - 0x8000;
412}
413UASM_EXPORT_SYMBOL(ISAFUNC(uasm_rel_lo));
414
415void ISAFUNC(UASM_i_LA_mostly)(u32 **buf, unsigned int rs, long addr)
416{
417 if (!ISAFUNC(uasm_in_compat_space_p)(addr)) {
418 ISAFUNC(uasm_i_lui)(buf, rs, uasm_rel_highest(addr));
419 if (uasm_rel_higher(addr))
420 ISAFUNC(uasm_i_daddiu)(buf, rs, rs, uasm_rel_higher(addr));
421 if (ISAFUNC(uasm_rel_hi(addr))) {
422 ISAFUNC(uasm_i_dsll)(buf, rs, rs, 16);
423 ISAFUNC(uasm_i_daddiu)(buf, rs, rs,
424 ISAFUNC(uasm_rel_hi)(addr));
425 ISAFUNC(uasm_i_dsll)(buf, rs, rs, 16);
426 } else
427 ISAFUNC(uasm_i_dsll32)(buf, rs, rs, 0);
428 } else
429 ISAFUNC(uasm_i_lui)(buf, rs, ISAFUNC(uasm_rel_hi(addr)));
430}
431UASM_EXPORT_SYMBOL(ISAFUNC(UASM_i_LA_mostly));
432
433void ISAFUNC(UASM_i_LA)(u32 **buf, unsigned int rs, long addr)
434{
435 ISAFUNC(UASM_i_LA_mostly)(buf, rs, addr);
436 if (ISAFUNC(uasm_rel_lo(addr))) {
437 if (!ISAFUNC(uasm_in_compat_space_p)(addr))
438 ISAFUNC(uasm_i_daddiu)(buf, rs, rs,
439 ISAFUNC(uasm_rel_lo(addr)));
440 else
441 ISAFUNC(uasm_i_addiu)(buf, rs, rs,
442 ISAFUNC(uasm_rel_lo(addr)));
443 }
444}
445UASM_EXPORT_SYMBOL(ISAFUNC(UASM_i_LA));
446
447/* Handle relocations. */
448void ISAFUNC(uasm_r_mips_pc16)(struct uasm_reloc **rel, u32 *addr, int lid)
449{
450 (*rel)->addr = addr;
451 (*rel)->type = R_MIPS_PC16;
452 (*rel)->lab = lid;
453 (*rel)++;
454}
455UASM_EXPORT_SYMBOL(ISAFUNC(uasm_r_mips_pc16));
456
457static inline void __resolve_relocs(struct uasm_reloc *rel,
458 struct uasm_label *lab);
459
460void ISAFUNC(uasm_resolve_relocs)(struct uasm_reloc *rel,
461 struct uasm_label *lab)
462{
463 struct uasm_label *l;
464
465 for (; rel->lab != UASM_LABEL_INVALID; rel++)
466 for (l = lab; l->lab != UASM_LABEL_INVALID; l++)
467 if (rel->lab == l->lab)
468 __resolve_relocs(rel, l);
469}
470UASM_EXPORT_SYMBOL(ISAFUNC(uasm_resolve_relocs));
471
472void ISAFUNC(uasm_move_relocs)(struct uasm_reloc *rel, u32 *first, u32 *end,
473 long off)
474{
475 for (; rel->lab != UASM_LABEL_INVALID; rel++)
476 if (rel->addr >= first && rel->addr < end)
477 rel->addr += off;
478}
479UASM_EXPORT_SYMBOL(ISAFUNC(uasm_move_relocs));
480
481void ISAFUNC(uasm_move_labels)(struct uasm_label *lab, u32 *first, u32 *end,
482 long off)
483{
484 for (; lab->lab != UASM_LABEL_INVALID; lab++)
485 if (lab->addr >= first && lab->addr < end)
486 lab->addr += off;
487}
488UASM_EXPORT_SYMBOL(ISAFUNC(uasm_move_labels));
489
490void ISAFUNC(uasm_copy_handler)(struct uasm_reloc *rel, struct uasm_label *lab,
491 u32 *first, u32 *end, u32 *target)
492{
493 long off = (long)(target - first);
494
495 memcpy(target, first, (end - first) * sizeof(u32));
496
497 ISAFUNC(uasm_move_relocs(rel, first, end, off));
498 ISAFUNC(uasm_move_labels(lab, first, end, off));
499}
500UASM_EXPORT_SYMBOL(ISAFUNC(uasm_copy_handler));
501
502int ISAFUNC(uasm_insn_has_bdelay)(struct uasm_reloc *rel, u32 *addr)
503{
504 for (; rel->lab != UASM_LABEL_INVALID; rel++) {
505 if (rel->addr == addr
506 && (rel->type == R_MIPS_PC16
507 || rel->type == R_MIPS_26))
508 return 1;
509 }
510
511 return 0;
512}
513UASM_EXPORT_SYMBOL(ISAFUNC(uasm_insn_has_bdelay));
514
515/* Convenience functions for labeled branches. */
516void ISAFUNC(uasm_il_bltz)(u32 **p, struct uasm_reloc **r, unsigned int reg,
517 int lid)
518{
519 uasm_r_mips_pc16(r, *p, lid);
520 ISAFUNC(uasm_i_bltz)(p, reg, 0);
521}
522UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bltz));
523
524void ISAFUNC(uasm_il_b)(u32 **p, struct uasm_reloc **r, int lid)
525{
526 uasm_r_mips_pc16(r, *p, lid);
527 ISAFUNC(uasm_i_b)(p, 0);
528}
529UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_b));
530
531void ISAFUNC(uasm_il_beq)(u32 **p, struct uasm_reloc **r, unsigned int r1,
532 unsigned int r2, int lid)
533{
534 uasm_r_mips_pc16(r, *p, lid);
535 ISAFUNC(uasm_i_beq)(p, r1, r2, 0);
536}
537UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_beq));
538
539void ISAFUNC(uasm_il_beqz)(u32 **p, struct uasm_reloc **r, unsigned int reg,
540 int lid)
541{
542 uasm_r_mips_pc16(r, *p, lid);
543 ISAFUNC(uasm_i_beqz)(p, reg, 0);
544}
545UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_beqz));
546
547void ISAFUNC(uasm_il_beqzl)(u32 **p, struct uasm_reloc **r, unsigned int reg,
548 int lid)
549{
550 uasm_r_mips_pc16(r, *p, lid);
551 ISAFUNC(uasm_i_beqzl)(p, reg, 0);
552}
553UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_beqzl));
554
555void ISAFUNC(uasm_il_bne)(u32 **p, struct uasm_reloc **r, unsigned int reg1,
556 unsigned int reg2, int lid)
557{
558 uasm_r_mips_pc16(r, *p, lid);
559 ISAFUNC(uasm_i_bne)(p, reg1, reg2, 0);
560}
561UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bne));
562
563void ISAFUNC(uasm_il_bnez)(u32 **p, struct uasm_reloc **r, unsigned int reg,
564 int lid)
565{
566 uasm_r_mips_pc16(r, *p, lid);
567 ISAFUNC(uasm_i_bnez)(p, reg, 0);
568}
569UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bnez));
570
571void ISAFUNC(uasm_il_bgezl)(u32 **p, struct uasm_reloc **r, unsigned int reg,
572 int lid)
573{
574 uasm_r_mips_pc16(r, *p, lid);
575 ISAFUNC(uasm_i_bgezl)(p, reg, 0);
576}
577UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bgezl));
578
579void ISAFUNC(uasm_il_bgez)(u32 **p, struct uasm_reloc **r, unsigned int reg,
580 int lid)
581{
582 uasm_r_mips_pc16(r, *p, lid);
583 ISAFUNC(uasm_i_bgez)(p, reg, 0);
584}
585UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bgez));
586
587void ISAFUNC(uasm_il_bbit0)(u32 **p, struct uasm_reloc **r, unsigned int reg,
588 unsigned int bit, int lid)
589{
590 uasm_r_mips_pc16(r, *p, lid);
591 ISAFUNC(uasm_i_bbit0)(p, reg, bit, 0);
592}
593UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bbit0));
594
595void ISAFUNC(uasm_il_bbit1)(u32 **p, struct uasm_reloc **r, unsigned int reg,
596 unsigned int bit, int lid)
597{
598 uasm_r_mips_pc16(r, *p, lid);
599 ISAFUNC(uasm_i_bbit1)(p, reg, bit, 0);
600}
601UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bbit1));