1 /* tc-riscv.c -- RISC-V assembler
2 Copyright (C) 2011-2017 Free Software Foundation, Inc.
4 Contributed by Andrew Waterman (andrew@sifive.com).
7 This file is part of GAS.
9 GAS is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GAS is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; see the file COPYING3. If not,
21 see <http://www.gnu.org/licenses/>. */
26 #include "safe-ctype.h"
29 #include "dwarf2dbg.h"
30 #include "dw2gencfi.h"
31 #include "struc-symbol.h"
33 #include "elf/riscv.h"
34 #include "opcode/riscv.h"
38 /* Information about an instruction, including its format, operands
42 /* The opcode's entry in riscv_opcodes. */
43 const struct riscv_opcode
*insn_mo
;
45 /* The encoded instruction bits. */
48 /* The frag that contains the instruction. */
51 /* The offset into FRAG of the first instruction byte. */
54 /* The relocs associated with the instruction, if any. */
59 #define DEFAULT_ARCH "riscv64"
62 static const char default_arch
[] = DEFAULT_ARCH
;
64 static unsigned xlen
= 0; /* width of an x-register */
65 static unsigned abi_xlen
= 0; /* width of a pointer in the ABI */
67 #define LOAD_ADDRESS_INSN (abi_xlen == 64 ? "ld" : "lw")
68 #define ADD32_INSN (xlen == 64 ? "addiw" : "addi")
70 static unsigned elf_flags
= 0;
72 /* This is the set of options which the .option pseudo-op may modify. */
74 struct riscv_set_options
76 int pic
; /* Generate position-independent code. */
77 int rvc
; /* Generate RVC code. */
78 int relax
; /* Emit relocs the linker is allowed to relax. */
81 static struct riscv_set_options riscv_opts
=
89 riscv_set_rvc (bfd_boolean rvc_value
)
92 elf_flags
|= EF_RISCV_RVC
;
94 riscv_opts
.rvc
= rvc_value
;
101 struct riscv_subset
*next
;
104 static struct riscv_subset
*riscv_subsets
;
107 riscv_subset_supports (const char *feature
)
109 struct riscv_subset
*s
;
111 unsigned xlen_required
= strtoul (feature
, &p
, 10);
113 if (xlen_required
&& xlen
!= xlen_required
)
116 for (s
= riscv_subsets
; s
!= NULL
; s
= s
->next
)
117 if (strcasecmp (s
->name
, p
) == 0)
124 riscv_add_subset (const char *subset
)
126 struct riscv_subset
*s
= xmalloc (sizeof *s
);
128 s
->name
= xstrdup (subset
);
129 s
->next
= riscv_subsets
;
133 /* Set which ISA and extensions are available. */
136 riscv_set_arch (const char *s
)
138 const char *all_subsets
= "imafdc";
139 const char *extension
= NULL
;
142 if (strncmp (p
, "rv32", 4) == 0)
147 else if (strncmp (p
, "rv64", 4) == 0)
153 as_fatal ("-march=%s: ISA string must begin with rv32 or rv64", s
);
162 for ( ; *all_subsets
!= 'c'; all_subsets
++)
164 const char subset
[] = {*all_subsets
, '\0'};
165 riscv_add_subset (subset
);
170 as_fatal ("-march=%s: first ISA subset must be `i' or `g'", s
);
177 char *subset
= xstrdup (p
), *q
= subset
;
179 while (*++q
!= '\0' && *q
!= '_')
184 as_fatal ("-march=%s: only one non-standard extension is supported"
185 " (found `%s' and `%s')", s
, extension
, subset
);
187 riscv_add_subset (subset
);
188 p
+= strlen (subset
);
193 else if ((all_subsets
= strchr (all_subsets
, *p
)) != NULL
)
195 const char subset
[] = {*p
, 0};
196 riscv_add_subset (subset
);
202 const char subset
[] = {*p
, 0};
203 riscv_add_subset (subset
);
207 as_fatal ("-march=%s: unsupported ISA subset `%c'", s
, *p
);
211 /* Handle of the OPCODE hash table. */
212 static struct hash_control
*op_hash
= NULL
;
214 /* This array holds the chars that always start a comment. If the
215 pre-processor is disabled, these aren't very useful */
216 const char comment_chars
[] = "#";
218 /* This array holds the chars that only start a comment at the beginning of
219 a line. If the line seems to have the form '# 123 filename'
220 .line and .file directives will appear in the pre-processed output */
221 /* Note that input_file.c hand checks for '#' at the beginning of the
222 first line of the input file. This is because the compiler outputs
223 #NO_APP at the beginning of its output. */
224 /* Also note that C style comments are always supported. */
225 const char line_comment_chars
[] = "#";
227 /* This array holds machine specific line separator characters. */
228 const char line_separator_chars
[] = ";";
230 /* Chars that can be used to separate mant from exp in floating point nums */
231 const char EXP_CHARS
[] = "eE";
233 /* Chars that mean this number is a floating point constant */
236 const char FLT_CHARS
[] = "rRsSfFdDxXpP";
238 /* Macros for encoding relaxation state for RVC branches and far jumps. */
239 #define RELAX_BRANCH_ENCODE(uncond, rvc, length) \
242 | ((uncond) ? 1 : 0) \
245 #define RELAX_BRANCH_P(i) (((i) & 0xf0000000) == 0xc0000000)
246 #define RELAX_BRANCH_LENGTH(i) (((i) >> 2) & 0xF)
247 #define RELAX_BRANCH_RVC(i) (((i) & 2) != 0)
248 #define RELAX_BRANCH_UNCOND(i) (((i) & 1) != 0)
250 /* Is the given value a sign-extended 32-bit value? */
251 #define IS_SEXT_32BIT_NUM(x) \
252 (((x) &~ (offsetT) 0x7fffffff) == 0 \
253 || (((x) &~ (offsetT) 0x7fffffff) == ~ (offsetT) 0x7fffffff))
255 /* Is the given value a zero-extended 32-bit value? Or a negated one? */
256 #define IS_ZEXT_32BIT_NUM(x) \
257 (((x) &~ (offsetT) 0xffffffff) == 0 \
258 || (((x) &~ (offsetT) 0xffffffff) == ~ (offsetT) 0xffffffff))
260 /* Change INSN's opcode so that the operand given by FIELD has value VALUE.
261 INSN is a riscv_cl_insn structure and VALUE is evaluated exactly once. */
262 #define INSERT_OPERAND(FIELD, INSN, VALUE) \
263 INSERT_BITS ((INSN).insn_opcode, VALUE, OP_MASK_##FIELD, OP_SH_##FIELD)
265 /* Determine if an instruction matches an opcode. */
266 #define OPCODE_MATCHES(OPCODE, OP) \
267 (((OPCODE) & MASK_##OP) == MATCH_##OP)
269 static char *expr_end
;
271 /* The default target format to use. */
274 riscv_target_format (void)
276 return xlen
== 64 ? "elf64-littleriscv" : "elf32-littleriscv";
279 /* Return the length of instruction INSN. */
281 static inline unsigned int
282 insn_length (const struct riscv_cl_insn
*insn
)
284 return riscv_insn_length (insn
->insn_opcode
);
287 /* Initialise INSN from opcode entry MO. Leave its position unspecified. */
290 create_insn (struct riscv_cl_insn
*insn
, const struct riscv_opcode
*mo
)
293 insn
->insn_opcode
= mo
->match
;
299 /* Install INSN at the location specified by its "frag" and "where" fields. */
302 install_insn (const struct riscv_cl_insn
*insn
)
304 char *f
= insn
->frag
->fr_literal
+ insn
->where
;
305 md_number_to_chars (f
, insn
->insn_opcode
, insn_length (insn
));
308 /* Move INSN to offset WHERE in FRAG. Adjust the fixups accordingly
309 and install the opcode in the new location. */
312 move_insn (struct riscv_cl_insn
*insn
, fragS
*frag
, long where
)
316 if (insn
->fixp
!= NULL
)
318 insn
->fixp
->fx_frag
= frag
;
319 insn
->fixp
->fx_where
= where
;
324 /* Add INSN to the end of the output. */
327 add_fixed_insn (struct riscv_cl_insn
*insn
)
329 char *f
= frag_more (insn_length (insn
));
330 move_insn (insn
, frag_now
, f
- frag_now
->fr_literal
);
334 add_relaxed_insn (struct riscv_cl_insn
*insn
, int max_chars
, int var
,
335 relax_substateT subtype
, symbolS
*symbol
, offsetT offset
)
337 frag_grow (max_chars
);
338 move_insn (insn
, frag_now
, frag_more (0) - frag_now
->fr_literal
);
339 frag_var (rs_machine_dependent
, max_chars
, var
,
340 subtype
, symbol
, offset
, NULL
);
343 /* Compute the length of a branch sequence, and adjust the stored length
344 accordingly. If FRAGP is NULL, the worst-case length is returned. */
347 relaxed_branch_length (fragS
*fragp
, asection
*sec
, int update
)
349 int jump
, rvc
, length
= 8;
354 jump
= RELAX_BRANCH_UNCOND (fragp
->fr_subtype
);
355 rvc
= RELAX_BRANCH_RVC (fragp
->fr_subtype
);
356 length
= RELAX_BRANCH_LENGTH (fragp
->fr_subtype
);
358 /* Assume jumps are in range; the linker will catch any that aren't. */
359 length
= jump
? 4 : 8;
361 if (fragp
->fr_symbol
!= NULL
362 && S_IS_DEFINED (fragp
->fr_symbol
)
363 && !S_IS_WEAK (fragp
->fr_symbol
)
364 && sec
== S_GET_SEGMENT (fragp
->fr_symbol
))
366 offsetT val
= S_GET_VALUE (fragp
->fr_symbol
) + fragp
->fr_offset
;
367 bfd_vma rvc_range
= jump
? RVC_JUMP_REACH
: RVC_BRANCH_REACH
;
368 val
-= fragp
->fr_address
+ fragp
->fr_fix
;
370 if (rvc
&& (bfd_vma
)(val
+ rvc_range
/2) < rvc_range
)
372 else if ((bfd_vma
)(val
+ RISCV_BRANCH_REACH
/2) < RISCV_BRANCH_REACH
)
374 else if (!jump
&& rvc
)
379 fragp
->fr_subtype
= RELAX_BRANCH_ENCODE (jump
, rvc
, length
);
398 static struct hash_control
*reg_names_hash
= NULL
;
400 #define ENCODE_REG_HASH(cls, n) \
401 ((void *)(uintptr_t)((n) * RCLASS_MAX + (cls) + 1))
402 #define DECODE_REG_CLASS(hash) (((uintptr_t)(hash) - 1) % RCLASS_MAX)
403 #define DECODE_REG_NUM(hash) (((uintptr_t)(hash) - 1) / RCLASS_MAX)
406 hash_reg_name (enum reg_class
class, const char *name
, unsigned n
)
408 void *hash
= ENCODE_REG_HASH (class, n
);
409 const char *retval
= hash_insert (reg_names_hash
, name
, hash
);
412 as_fatal (_("internal error: can't hash `%s': %s"), name
, retval
);
416 hash_reg_names (enum reg_class
class, const char * const names
[], unsigned n
)
420 for (i
= 0; i
< n
; i
++)
421 hash_reg_name (class, names
[i
], i
);
425 reg_lookup_internal (const char *s
, enum reg_class
class)
427 struct regname
*r
= (struct regname
*) hash_find (reg_names_hash
, s
);
429 if (r
== NULL
|| DECODE_REG_CLASS (r
) != class)
431 return DECODE_REG_NUM (r
);
435 reg_lookup (char **s
, enum reg_class
class, unsigned int *regnop
)
441 /* Find end of name. */
443 if (is_name_beginner (*e
))
445 while (is_part_of_name (*e
))
448 /* Terminate name. */
452 /* Look for the register. Advance to next token if one was recognized. */
453 if ((reg
= reg_lookup_internal (*s
, class)) >= 0)
463 arg_lookup (char **s
, const char *const *array
, size_t size
, unsigned *regnop
)
465 const char *p
= strchr (*s
, ',');
466 size_t i
, len
= p
? (size_t)(p
- *s
) : strlen (*s
);
468 for (i
= 0; i
< size
; i
++)
469 if (array
[i
] != NULL
&& strncmp (array
[i
], *s
, len
) == 0)
479 /* For consistency checking, verify that all bits are specified either
480 by the match/mask part of the instruction definition, or by the
483 validate_riscv_insn (const struct riscv_opcode
*opc
)
485 const char *p
= opc
->args
;
487 insn_t used_bits
= opc
->mask
;
488 int insn_width
= 8 * riscv_insn_length (opc
->match
);
489 insn_t required_bits
= ~0ULL >> (64 - insn_width
);
491 if ((used_bits
& opc
->match
) != (opc
->match
& required_bits
))
493 as_bad (_("internal: bad RISC-V opcode (mask error): %s %s"),
494 opc
->name
, opc
->args
);
498 #define USE_BITS(mask,shift) (used_bits |= ((insn_t)(mask) << (shift)))
505 case 'a': used_bits
|= ENCODE_RVC_J_IMM (-1U); break;
506 case 'c': break; /* RS1, constrained to equal sp */
507 case 'i': used_bits
|= ENCODE_RVC_SIMM3(-1U); break;
508 case 'j': used_bits
|= ENCODE_RVC_IMM (-1U); break;
509 case 'o': used_bits
|= ENCODE_RVC_IMM (-1U); break;
510 case 'k': used_bits
|= ENCODE_RVC_LW_IMM (-1U); break;
511 case 'l': used_bits
|= ENCODE_RVC_LD_IMM (-1U); break;
512 case 'm': used_bits
|= ENCODE_RVC_LWSP_IMM (-1U); break;
513 case 'n': used_bits
|= ENCODE_RVC_LDSP_IMM (-1U); break;
514 case 'p': used_bits
|= ENCODE_RVC_B_IMM (-1U); break;
515 case 's': USE_BITS (OP_MASK_CRS1S
, OP_SH_CRS1S
); break;
516 case 't': USE_BITS (OP_MASK_CRS2S
, OP_SH_CRS2S
); break;
517 case 'u': used_bits
|= ENCODE_RVC_IMM (-1U); break;
518 case 'v': used_bits
|= ENCODE_RVC_IMM (-1U); break;
519 case 'w': break; /* RS1S, constrained to equal RD */
520 case 'x': break; /* RS2S, constrained to equal RD */
521 case 'K': used_bits
|= ENCODE_RVC_ADDI4SPN_IMM (-1U); break;
522 case 'L': used_bits
|= ENCODE_RVC_ADDI16SP_IMM (-1U); break;
523 case 'M': used_bits
|= ENCODE_RVC_SWSP_IMM (-1U); break;
524 case 'N': used_bits
|= ENCODE_RVC_SDSP_IMM (-1U); break;
525 case 'U': break; /* RS1, constrained to equal RD */
526 case 'V': USE_BITS (OP_MASK_CRS2
, OP_SH_CRS2
); break;
527 case '<': used_bits
|= ENCODE_RVC_IMM (-1U); break;
528 case '>': used_bits
|= ENCODE_RVC_IMM (-1U); break;
529 case 'T': USE_BITS (OP_MASK_CRS2
, OP_SH_CRS2
); break;
530 case 'D': USE_BITS (OP_MASK_CRS2S
, OP_SH_CRS2S
); break;
532 as_bad (_("internal: bad RISC-V opcode (unknown operand type `C%c'): %s %s"),
533 c
, opc
->name
, opc
->args
);
540 case '<': USE_BITS (OP_MASK_SHAMTW
, OP_SH_SHAMTW
); break;
541 case '>': USE_BITS (OP_MASK_SHAMT
, OP_SH_SHAMT
); break;
543 case 'D': USE_BITS (OP_MASK_RD
, OP_SH_RD
); break;
544 case 'Z': USE_BITS (OP_MASK_RS1
, OP_SH_RS1
); break;
545 case 'E': USE_BITS (OP_MASK_CSR
, OP_SH_CSR
); break;
547 case 'R': USE_BITS (OP_MASK_RS3
, OP_SH_RS3
); break;
548 case 'S': USE_BITS (OP_MASK_RS1
, OP_SH_RS1
); break;
549 case 'U': USE_BITS (OP_MASK_RS1
, OP_SH_RS1
); /* fallthru */
550 case 'T': USE_BITS (OP_MASK_RS2
, OP_SH_RS2
); break;
551 case 'd': USE_BITS (OP_MASK_RD
, OP_SH_RD
); break;
552 case 'm': USE_BITS (OP_MASK_RM
, OP_SH_RM
); break;
553 case 's': USE_BITS (OP_MASK_RS1
, OP_SH_RS1
); break;
554 case 't': USE_BITS (OP_MASK_RS2
, OP_SH_RS2
); break;
555 case 'P': USE_BITS (OP_MASK_PRED
, OP_SH_PRED
); break;
556 case 'Q': USE_BITS (OP_MASK_SUCC
, OP_SH_SUCC
); break;
558 case 'j': used_bits
|= ENCODE_ITYPE_IMM (-1U); break;
559 case 'a': used_bits
|= ENCODE_UJTYPE_IMM (-1U); break;
560 case 'p': used_bits
|= ENCODE_SBTYPE_IMM (-1U); break;
561 case 'q': used_bits
|= ENCODE_STYPE_IMM (-1U); break;
562 case 'u': used_bits
|= ENCODE_UTYPE_IMM (-1U); break;
567 as_bad (_("internal: bad RISC-V opcode "
568 "(unknown operand type `%c'): %s %s"),
569 c
, opc
->name
, opc
->args
);
573 if (used_bits
!= required_bits
)
575 as_bad (_("internal: bad RISC-V opcode (bits 0x%lx undefined): %s %s"),
576 ~(unsigned long)(used_bits
& required_bits
),
577 opc
->name
, opc
->args
);
583 struct percent_op_match
586 bfd_reloc_code_real_type reloc
;
589 /* This function is called once, at assembler startup time. It should set up
590 all the tables, etc. that the MD part of the assembler will need. */
596 unsigned long mach
= xlen
== 64 ? bfd_mach_riscv64
: bfd_mach_riscv32
;
598 if (! bfd_set_arch_mach (stdoutput
, bfd_arch_riscv
, mach
))
599 as_warn (_("Could not set architecture and machine"));
601 op_hash
= hash_new ();
603 while (riscv_opcodes
[i
].name
)
605 const char *name
= riscv_opcodes
[i
].name
;
606 const char *hash_error
=
607 hash_insert (op_hash
, name
, (void *) &riscv_opcodes
[i
]);
611 fprintf (stderr
, _("internal error: can't hash `%s': %s\n"),
612 riscv_opcodes
[i
].name
, hash_error
);
613 /* Probably a memory allocation problem? Give up now. */
614 as_fatal (_("Broken assembler. No assembly attempted."));
619 if (riscv_opcodes
[i
].pinfo
!= INSN_MACRO
)
621 if (!validate_riscv_insn (&riscv_opcodes
[i
]))
622 as_fatal (_("Broken assembler. No assembly attempted."));
626 while (riscv_opcodes
[i
].name
&& !strcmp (riscv_opcodes
[i
].name
, name
));
629 reg_names_hash
= hash_new ();
630 hash_reg_names (RCLASS_GPR
, riscv_gpr_names_numeric
, NGPR
);
631 hash_reg_names (RCLASS_GPR
, riscv_gpr_names_abi
, NGPR
);
632 hash_reg_names (RCLASS_FPR
, riscv_fpr_names_numeric
, NFPR
);
633 hash_reg_names (RCLASS_FPR
, riscv_fpr_names_abi
, NFPR
);
635 #define DECLARE_CSR(name, num) hash_reg_name (RCLASS_CSR, #name, num);
636 #include "opcode/riscv-opc.h"
639 /* Set the default alignment for the text section. */
640 record_alignment (text_section
, riscv_opts
.rvc
? 1 : 2);
644 riscv_apply_const_reloc (bfd_reloc_code_real_type reloc_type
, bfd_vma value
)
651 case BFD_RELOC_RISCV_HI20
:
652 return ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value
));
654 case BFD_RELOC_RISCV_LO12_S
:
655 return ENCODE_STYPE_IMM (value
);
657 case BFD_RELOC_RISCV_LO12_I
:
658 return ENCODE_ITYPE_IMM (value
);
665 /* Output an instruction. IP is the instruction information.
666 ADDRESS_EXPR is an operand of the instruction to be used with
670 append_insn (struct riscv_cl_insn
*ip
, expressionS
*address_expr
,
671 bfd_reloc_code_real_type reloc_type
)
673 dwarf2_emit_insn (0);
675 if (reloc_type
!= BFD_RELOC_UNUSED
)
677 reloc_howto_type
*howto
;
679 gas_assert (address_expr
);
680 if (reloc_type
== BFD_RELOC_12_PCREL
681 || reloc_type
== BFD_RELOC_RISCV_JMP
)
683 int j
= reloc_type
== BFD_RELOC_RISCV_JMP
;
684 int best_case
= riscv_insn_length (ip
->insn_opcode
);
685 unsigned worst_case
= relaxed_branch_length (NULL
, NULL
, 0);
686 add_relaxed_insn (ip
, worst_case
, best_case
,
687 RELAX_BRANCH_ENCODE (j
, best_case
== 2, worst_case
),
688 address_expr
->X_add_symbol
,
689 address_expr
->X_add_number
);
694 howto
= bfd_reloc_type_lookup (stdoutput
, reloc_type
);
696 as_bad (_("Unsupported RISC-V relocation number %d"), reloc_type
);
698 ip
->fixp
= fix_new_exp (ip
->frag
, ip
->where
,
699 bfd_get_reloc_size (howto
),
700 address_expr
, FALSE
, reloc_type
);
702 ip
->fixp
->fx_tcbit
= riscv_opts
.relax
;
710 /* Build an instruction created by a macro expansion. This is passed
711 a pointer to the count of instructions created so far, an
712 expression, the name of the instruction to build, an operand format
713 string, and corresponding arguments. */
716 macro_build (expressionS
*ep
, const char *name
, const char *fmt
, ...)
718 const struct riscv_opcode
*mo
;
719 struct riscv_cl_insn insn
;
720 bfd_reloc_code_real_type r
;
723 va_start (args
, fmt
);
725 r
= BFD_RELOC_UNUSED
;
726 mo
= (struct riscv_opcode
*) hash_find (op_hash
, name
);
729 /* Find a non-RVC variant of the instruction. append_insn will compress
731 while (riscv_insn_length (mo
->match
) < 4)
733 gas_assert (strcmp (name
, mo
->name
) == 0);
735 create_insn (&insn
, mo
);
741 INSERT_OPERAND (RD
, insn
, va_arg (args
, int));
745 INSERT_OPERAND (RS1
, insn
, va_arg (args
, int));
749 INSERT_OPERAND (RS2
, insn
, va_arg (args
, int));
753 INSERT_OPERAND (SHAMT
, insn
, va_arg (args
, int));
759 gas_assert (ep
!= NULL
);
760 r
= va_arg (args
, int);
768 as_fatal (_("internal error: invalid macro"));
773 gas_assert (r
== BFD_RELOC_UNUSED
? ep
== NULL
: ep
!= NULL
);
775 append_insn (&insn
, ep
, r
);
778 /* Sign-extend 32-bit mode constants that have bit 31 set and all higher bits
781 normalize_constant_expr (expressionS
*ex
)
785 if ((ex
->X_op
== O_constant
|| ex
->X_op
== O_symbol
)
786 && IS_ZEXT_32BIT_NUM (ex
->X_add_number
))
787 ex
->X_add_number
= (((ex
->X_add_number
& 0xffffffff) ^ 0x80000000)
791 /* Fail if an expression is not a constant. */
794 check_absolute_expr (struct riscv_cl_insn
*ip
, expressionS
*ex
)
796 if (ex
->X_op
== O_big
)
797 as_bad (_("unsupported large constant"));
798 else if (ex
->X_op
!= O_constant
)
799 as_bad (_("Instruction %s requires absolute expression"),
801 normalize_constant_expr (ex
);
805 make_internal_label (void)
807 return (symbolS
*) local_symbol_make (FAKE_LABEL_NAME
, now_seg
,
808 (valueT
) frag_now_fix (), frag_now
);
811 /* Load an entry from the GOT. */
813 pcrel_access (int destreg
, int tempreg
, expressionS
*ep
,
814 const char *lo_insn
, const char *lo_pattern
,
815 bfd_reloc_code_real_type hi_reloc
,
816 bfd_reloc_code_real_type lo_reloc
)
820 ep2
.X_add_symbol
= make_internal_label ();
821 ep2
.X_add_number
= 0;
823 macro_build (ep
, "auipc", "d,u", tempreg
, hi_reloc
);
824 macro_build (&ep2
, lo_insn
, lo_pattern
, destreg
, tempreg
, lo_reloc
);
828 pcrel_load (int destreg
, int tempreg
, expressionS
*ep
, const char *lo_insn
,
829 bfd_reloc_code_real_type hi_reloc
,
830 bfd_reloc_code_real_type lo_reloc
)
832 pcrel_access (destreg
, tempreg
, ep
, lo_insn
, "d,s,j", hi_reloc
, lo_reloc
);
836 pcrel_store (int srcreg
, int tempreg
, expressionS
*ep
, const char *lo_insn
,
837 bfd_reloc_code_real_type hi_reloc
,
838 bfd_reloc_code_real_type lo_reloc
)
840 pcrel_access (srcreg
, tempreg
, ep
, lo_insn
, "t,s,q", hi_reloc
, lo_reloc
);
843 /* PC-relative function call using AUIPC/JALR, relaxed to JAL. */
845 riscv_call (int destreg
, int tempreg
, expressionS
*ep
,
846 bfd_reloc_code_real_type reloc
)
848 macro_build (ep
, "auipc", "d,u", tempreg
, reloc
);
849 macro_build (NULL
, "jalr", "d,s", destreg
, tempreg
);
852 /* Load an integer constant into a register. */
855 load_const (int reg
, expressionS
*ep
)
857 int shift
= RISCV_IMM_BITS
;
858 expressionS upper
= *ep
, lower
= *ep
;
859 lower
.X_add_number
= (int32_t) ep
->X_add_number
<< (32-shift
) >> (32-shift
);
860 upper
.X_add_number
-= lower
.X_add_number
;
862 if (ep
->X_op
!= O_constant
)
864 as_bad (_("unsupported large constant"));
868 if (xlen
> 32 && !IS_SEXT_32BIT_NUM (ep
->X_add_number
))
870 /* Reduce to a signed 32-bit constant using SLLI and ADDI. */
871 while (((upper
.X_add_number
>> shift
) & 1) == 0)
874 upper
.X_add_number
= (int64_t) upper
.X_add_number
>> shift
;
875 load_const (reg
, &upper
);
877 macro_build (NULL
, "slli", "d,s,>", reg
, reg
, shift
);
878 if (lower
.X_add_number
!= 0)
879 macro_build (&lower
, "addi", "d,s,j", reg
, reg
, BFD_RELOC_RISCV_LO12_I
);
883 /* Simply emit LUI and/or ADDI to build a 32-bit signed constant. */
886 if (upper
.X_add_number
!= 0)
888 macro_build (ep
, "lui", "d,u", reg
, BFD_RELOC_RISCV_HI20
);
892 if (lower
.X_add_number
!= 0 || hi_reg
== 0)
893 macro_build (ep
, ADD32_INSN
, "d,s,j", reg
, hi_reg
,
894 BFD_RELOC_RISCV_LO12_I
);
898 /* Expand RISC-V assembly macros into one or more instructions. */
900 macro (struct riscv_cl_insn
*ip
, expressionS
*imm_expr
,
901 bfd_reloc_code_real_type
*imm_reloc
)
903 int rd
= (ip
->insn_opcode
>> OP_SH_RD
) & OP_MASK_RD
;
904 int rs1
= (ip
->insn_opcode
>> OP_SH_RS1
) & OP_MASK_RS1
;
905 int rs2
= (ip
->insn_opcode
>> OP_SH_RS2
) & OP_MASK_RS2
;
906 int mask
= ip
->insn_mo
->mask
;
911 load_const (rd
, imm_expr
);
916 /* Load the address of a symbol into a register. */
917 if (!IS_SEXT_32BIT_NUM (imm_expr
->X_add_number
))
918 as_bad (_("offset too large"));
920 if (imm_expr
->X_op
== O_constant
)
921 load_const (rd
, imm_expr
);
922 else if (riscv_opts
.pic
&& mask
== M_LA
) /* Global PIC symbol */
923 pcrel_load (rd
, rd
, imm_expr
, LOAD_ADDRESS_INSN
,
924 BFD_RELOC_RISCV_GOT_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
925 else /* Local PIC symbol, or any non-PIC symbol */
926 pcrel_load (rd
, rd
, imm_expr
, "addi",
927 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
931 pcrel_load (rd
, rd
, imm_expr
, "addi",
932 BFD_RELOC_RISCV_TLS_GD_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
936 pcrel_load (rd
, rd
, imm_expr
, LOAD_ADDRESS_INSN
,
937 BFD_RELOC_RISCV_TLS_GOT_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
941 pcrel_load (rd
, rd
, imm_expr
, "lb",
942 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
946 pcrel_load (rd
, rd
, imm_expr
, "lbu",
947 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
951 pcrel_load (rd
, rd
, imm_expr
, "lh",
952 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
956 pcrel_load (rd
, rd
, imm_expr
, "lhu",
957 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
961 pcrel_load (rd
, rd
, imm_expr
, "lw",
962 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
966 pcrel_load (rd
, rd
, imm_expr
, "lwu",
967 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
971 pcrel_load (rd
, rd
, imm_expr
, "ld",
972 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
976 pcrel_load (rd
, rs1
, imm_expr
, "flw",
977 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
981 pcrel_load (rd
, rs1
, imm_expr
, "fld",
982 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_I
);
986 pcrel_store (rs2
, rs1
, imm_expr
, "sb",
987 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_S
);
991 pcrel_store (rs2
, rs1
, imm_expr
, "sh",
992 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_S
);
996 pcrel_store (rs2
, rs1
, imm_expr
, "sw",
997 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_S
);
1001 pcrel_store (rs2
, rs1
, imm_expr
, "sd",
1002 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_S
);
1006 pcrel_store (rs2
, rs1
, imm_expr
, "fsw",
1007 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_S
);
1011 pcrel_store (rs2
, rs1
, imm_expr
, "fsd",
1012 BFD_RELOC_RISCV_PCREL_HI20
, BFD_RELOC_RISCV_PCREL_LO12_S
);
1016 riscv_call (rd
, rs1
, imm_expr
, *imm_reloc
);
1020 as_bad (_("Macro %s not implemented"), ip
->insn_mo
->name
);
1025 static const struct percent_op_match percent_op_utype
[] =
1027 {"%tprel_hi", BFD_RELOC_RISCV_TPREL_HI20
},
1028 {"%pcrel_hi", BFD_RELOC_RISCV_PCREL_HI20
},
1029 {"%tls_ie_pcrel_hi", BFD_RELOC_RISCV_TLS_GOT_HI20
},
1030 {"%tls_gd_pcrel_hi", BFD_RELOC_RISCV_TLS_GD_HI20
},
1031 {"%hi", BFD_RELOC_RISCV_HI20
},
1035 static const struct percent_op_match percent_op_itype
[] =
1037 {"%lo", BFD_RELOC_RISCV_LO12_I
},
1038 {"%tprel_lo", BFD_RELOC_RISCV_TPREL_LO12_I
},
1039 {"%pcrel_lo", BFD_RELOC_RISCV_PCREL_LO12_I
},
1043 static const struct percent_op_match percent_op_stype
[] =
1045 {"%lo", BFD_RELOC_RISCV_LO12_S
},
1046 {"%tprel_lo", BFD_RELOC_RISCV_TPREL_LO12_S
},
1047 {"%pcrel_lo", BFD_RELOC_RISCV_PCREL_LO12_S
},
1051 static const struct percent_op_match percent_op_rtype
[] =
1053 {"%tprel_add", BFD_RELOC_RISCV_TPREL_ADD
},
1057 /* Return true if *STR points to a relocation operator. When returning true,
1058 move *STR over the operator and store its relocation code in *RELOC.
1059 Leave both *STR and *RELOC alone when returning false. */
1062 parse_relocation (char **str
, bfd_reloc_code_real_type
*reloc
,
1063 const struct percent_op_match
*percent_op
)
1065 for ( ; percent_op
->str
; percent_op
++)
1066 if (strncasecmp (*str
, percent_op
->str
, strlen (percent_op
->str
)) == 0)
1068 int len
= strlen (percent_op
->str
);
1070 if (!ISSPACE ((*str
)[len
]) && (*str
)[len
] != '(')
1073 *str
+= strlen (percent_op
->str
);
1074 *reloc
= percent_op
->reloc
;
1076 /* Check whether the output BFD supports this relocation.
1077 If not, issue an error and fall back on something safe. */
1078 if (*reloc
!= BFD_RELOC_UNUSED
1079 && !bfd_reloc_type_lookup (stdoutput
, *reloc
))
1081 as_bad ("relocation %s isn't supported by the current ABI",
1083 *reloc
= BFD_RELOC_UNUSED
;
1091 my_getExpression (expressionS
*ep
, char *str
)
1095 save_in
= input_line_pointer
;
1096 input_line_pointer
= str
;
1098 expr_end
= input_line_pointer
;
1099 input_line_pointer
= save_in
;
1102 /* Parse string STR as a 16-bit relocatable operand. Store the
1103 expression in *EP and the relocation, if any, in RELOC.
1104 Return the number of relocation operators used (0 or 1).
1106 On exit, EXPR_END points to the first character after the expression. */
1109 my_getSmallExpression (expressionS
*ep
, bfd_reloc_code_real_type
*reloc
,
1110 char *str
, const struct percent_op_match
*percent_op
)
1113 unsigned crux_depth
, str_depth
, regno
;
1116 /* First, check for integer registers. */
1117 if (reg_lookup (&str
, RCLASS_GPR
, ®no
))
1119 ep
->X_op
= O_register
;
1120 ep
->X_add_number
= regno
;
1124 /* Search for the start of the main expression.
1125 End the loop with CRUX pointing to the start
1126 of the main expression and with CRUX_DEPTH containing the number
1127 of open brackets at that point. */
1134 crux_depth
= str_depth
;
1136 /* Skip over whitespace and brackets, keeping count of the number
1138 while (*str
== ' ' || *str
== '\t' || *str
== '(')
1144 && parse_relocation (&str
, reloc
, percent_op
));
1146 my_getExpression (ep
, crux
);
1149 /* Match every open bracket. */
1150 while (crux_depth
> 0 && (*str
== ')' || *str
== ' ' || *str
== '\t'))
1155 as_bad ("unclosed '('");
1162 /* This routine assembles an instruction into its binary format. As a
1163 side effect, it sets the global variable imm_reloc to the type of
1164 relocation to do if one of the operands is an address expression. */
1167 riscv_ip (char *str
, struct riscv_cl_insn
*ip
, expressionS
*imm_expr
,
1168 bfd_reloc_code_real_type
*imm_reloc
)
1173 struct riscv_opcode
*insn
;
1178 const struct percent_op_match
*p
;
1179 const char *error
= "unrecognized opcode";
1181 /* Parse the name of the instruction. Terminate the string if whitespace
1182 is found so that hash_find only sees the name part of the string. */
1183 for (s
= str
; *s
!= '\0'; ++s
)
1191 insn
= (struct riscv_opcode
*) hash_find (op_hash
, str
);
1194 for ( ; insn
&& insn
->name
&& strcmp (insn
->name
, str
) == 0; insn
++)
1196 if (!riscv_subset_supports (insn
->subset
))
1199 create_insn (ip
, insn
);
1202 imm_expr
->X_op
= O_absent
;
1203 *imm_reloc
= BFD_RELOC_UNUSED
;
1204 p
= percent_op_itype
;
1206 for (args
= insn
->args
;; ++args
)
1208 s
+= strspn (s
, " \t");
1211 case '\0': /* End of args. */
1212 if (insn
->pinfo
!= INSN_MACRO
)
1214 if (!insn
->match_func (insn
, ip
->insn_opcode
))
1216 if (riscv_insn_length (insn
->match
) == 2 && !riscv_opts
.rvc
)
1221 /* Successful assembly. */
1228 case 's': /* RS1 x8-x15 */
1229 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
)
1230 || !(regno
>= 8 && regno
<= 15))
1232 INSERT_OPERAND (CRS1S
, *ip
, regno
% 8);
1234 case 'w': /* RS1 x8-x15, constrained to equal RD x8-x15. */
1235 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
)
1236 || EXTRACT_OPERAND (CRS1S
, ip
->insn_opcode
) + 8 != regno
)
1239 case 't': /* RS2 x8-x15 */
1240 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
)
1241 || !(regno
>= 8 && regno
<= 15))
1243 INSERT_OPERAND (CRS2S
, *ip
, regno
% 8);
1245 case 'x': /* RS2 x8-x15, constrained to equal RD x8-x15. */
1246 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
)
1247 || EXTRACT_OPERAND (CRS2S
, ip
->insn_opcode
) + 8 != regno
)
1250 case 'U': /* RS1, constrained to equal RD. */
1251 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
)
1252 || EXTRACT_OPERAND (RD
, ip
->insn_opcode
) != regno
)
1256 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
))
1258 INSERT_OPERAND (CRS2
, *ip
, regno
);
1260 case 'c': /* RS1, constrained to equal sp. */
1261 if (!reg_lookup (&s
, RCLASS_GPR
, ®no
)
1266 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1267 || imm_expr
->X_op
!= O_constant
1268 || imm_expr
->X_add_number
<= 0
1269 || imm_expr
->X_add_number
>= 64)
1271 ip
->insn_opcode
|= ENCODE_RVC_IMM (imm_expr
->X_add_number
);
1274 imm_expr
->X_op
= O_absent
;
1277 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1278 || imm_expr
->X_op
!= O_constant
1279 || !VALID_RVC_IMM (imm_expr
->X_add_number
)
1280 || imm_expr
->X_add_number
<= 0
1281 || imm_expr
->X_add_number
>= 32)
1283 ip
->insn_opcode
|= ENCODE_RVC_IMM (imm_expr
->X_add_number
);
1286 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1287 || imm_expr
->X_op
!= O_constant
1288 || imm_expr
->X_add_number
== 0
1289 || !VALID_RVC_SIMM3 (imm_expr
->X_add_number
))
1291 ip
->insn_opcode
|= ENCODE_RVC_SIMM3 (imm_expr
->X_add_number
);
1294 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1295 || imm_expr
->X_op
!= O_constant
1296 || imm_expr
->X_add_number
== 0
1297 || !VALID_RVC_IMM (imm_expr
->X_add_number
))
1299 ip
->insn_opcode
|= ENCODE_RVC_IMM (imm_expr
->X_add_number
);
1302 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1303 || imm_expr
->X_op
!= O_constant
1304 || !VALID_RVC_LW_IMM (imm_expr
->X_add_number
))
1306 ip
->insn_opcode
|= ENCODE_RVC_LW_IMM (imm_expr
->X_add_number
);
1309 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1310 || imm_expr
->X_op
!= O_constant
1311 || !VALID_RVC_LD_IMM (imm_expr
->X_add_number
))
1313 ip
->insn_opcode
|= ENCODE_RVC_LD_IMM (imm_expr
->X_add_number
);
1316 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1317 || imm_expr
->X_op
!= O_constant
1318 || !VALID_RVC_LWSP_IMM (imm_expr
->X_add_number
))
1321 ENCODE_RVC_LWSP_IMM (imm_expr
->X_add_number
);
1324 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1325 || imm_expr
->X_op
!= O_constant
1326 || !VALID_RVC_LDSP_IMM (imm_expr
->X_add_number
))
1329 ENCODE_RVC_LDSP_IMM (imm_expr
->X_add_number
);
1332 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1333 || imm_expr
->X_op
!= O_constant
1334 || !VALID_RVC_IMM (imm_expr
->X_add_number
))
1336 ip
->insn_opcode
|= ENCODE_RVC_IMM (imm_expr
->X_add_number
);
1339 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1340 || imm_expr
->X_op
!= O_constant
1341 || !VALID_RVC_ADDI4SPN_IMM (imm_expr
->X_add_number
)
1342 || imm_expr
->X_add_number
== 0)
1345 ENCODE_RVC_ADDI4SPN_IMM (imm_expr
->X_add_number
);
1348 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1349 || imm_expr
->X_op
!= O_constant
1350 || !VALID_RVC_ADDI16SP_IMM (imm_expr
->X_add_number
)
1351 || imm_expr
->X_add_number
== 0)
1354 ENCODE_RVC_ADDI16SP_IMM (imm_expr
->X_add_number
);
1357 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1358 || imm_expr
->X_op
!= O_constant
1359 || !VALID_RVC_SWSP_IMM (imm_expr
->X_add_number
))
1362 ENCODE_RVC_SWSP_IMM (imm_expr
->X_add_number
);
1365 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1366 || imm_expr
->X_op
!= O_constant
1367 || !VALID_RVC_SDSP_IMM (imm_expr
->X_add_number
))
1370 ENCODE_RVC_SDSP_IMM (imm_expr
->X_add_number
);
1373 p
= percent_op_utype
;
1374 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
))
1377 if (imm_expr
->X_op
!= O_constant
1378 || imm_expr
->X_add_number
<= 0
1379 || imm_expr
->X_add_number
>= RISCV_BIGIMM_REACH
1380 || (imm_expr
->X_add_number
>= RISCV_RVC_IMM_REACH
/ 2
1381 && (imm_expr
->X_add_number
<
1382 RISCV_BIGIMM_REACH
- RISCV_RVC_IMM_REACH
/ 2)))
1384 ip
->insn_opcode
|= ENCODE_RVC_IMM (imm_expr
->X_add_number
);
1387 if (my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1388 || (imm_expr
->X_add_number
& (RISCV_IMM_REACH
- 1))
1389 || ((int32_t)imm_expr
->X_add_number
1390 != imm_expr
->X_add_number
))
1392 imm_expr
->X_add_number
=
1393 ((uint32_t) imm_expr
->X_add_number
) >> RISCV_IMM_BITS
;
1399 case 'D': /* Floating-point RS2 x8-x15. */
1400 if (!reg_lookup (&s
, RCLASS_FPR
, ®no
)
1401 || !(regno
>= 8 && regno
<= 15))
1403 INSERT_OPERAND (CRS2S
, *ip
, regno
% 8);
1405 case 'T': /* Floating-point RS2. */
1406 if (!reg_lookup (&s
, RCLASS_FPR
, ®no
))
1408 INSERT_OPERAND (CRS2
, *ip
, regno
);
1411 as_bad (_("bad RVC field specifier 'C%c'\n"), *args
);
1430 case '<': /* Shift amount, 0 - 31. */
1431 my_getExpression (imm_expr
, s
);
1432 check_absolute_expr (ip
, imm_expr
);
1433 if ((unsigned long) imm_expr
->X_add_number
> 31)
1434 as_warn (_("Improper shift amount (%lu)"),
1435 (unsigned long) imm_expr
->X_add_number
);
1436 INSERT_OPERAND (SHAMTW
, *ip
, imm_expr
->X_add_number
);
1437 imm_expr
->X_op
= O_absent
;
1441 case '>': /* Shift amount, 0 - (XLEN-1). */
1442 my_getExpression (imm_expr
, s
);
1443 check_absolute_expr (ip
, imm_expr
);
1444 if ((unsigned long) imm_expr
->X_add_number
>= xlen
)
1445 as_warn (_("Improper shift amount (%lu)"),
1446 (unsigned long) imm_expr
->X_add_number
);
1447 INSERT_OPERAND (SHAMT
, *ip
, imm_expr
->X_add_number
);
1448 imm_expr
->X_op
= O_absent
;
1452 case 'Z': /* CSRRxI immediate. */
1453 my_getExpression (imm_expr
, s
);
1454 check_absolute_expr (ip
, imm_expr
);
1455 if ((unsigned long) imm_expr
->X_add_number
> 31)
1456 as_warn (_("Improper CSRxI immediate (%lu)"),
1457 (unsigned long) imm_expr
->X_add_number
);
1458 INSERT_OPERAND (RS1
, *ip
, imm_expr
->X_add_number
);
1459 imm_expr
->X_op
= O_absent
;
1463 case 'E': /* Control register. */
1464 if (reg_lookup (&s
, RCLASS_CSR
, ®no
))
1465 INSERT_OPERAND (CSR
, *ip
, regno
);
1468 my_getExpression (imm_expr
, s
);
1469 check_absolute_expr (ip
, imm_expr
);
1470 if ((unsigned long) imm_expr
->X_add_number
> 0xfff)
1471 as_warn (_("Improper CSR address (%lu)"),
1472 (unsigned long) imm_expr
->X_add_number
);
1473 INSERT_OPERAND (CSR
, *ip
, imm_expr
->X_add_number
);
1474 imm_expr
->X_op
= O_absent
;
1479 case 'm': /* Rounding mode. */
1480 if (arg_lookup (&s
, riscv_rm
, ARRAY_SIZE (riscv_rm
), ®no
))
1482 INSERT_OPERAND (RM
, *ip
, regno
);
1488 case 'Q': /* Fence predecessor/successor. */
1489 if (arg_lookup (&s
, riscv_pred_succ
, ARRAY_SIZE (riscv_pred_succ
),
1493 INSERT_OPERAND (PRED
, *ip
, regno
);
1495 INSERT_OPERAND (SUCC
, *ip
, regno
);
1500 case 'd': /* Destination register. */
1501 case 's': /* Source register. */
1502 case 't': /* Target register. */
1503 if (reg_lookup (&s
, RCLASS_GPR
, ®no
))
1509 /* Now that we have assembled one operand, we use the args
1510 string to figure out where it goes in the instruction. */
1514 INSERT_OPERAND (RS1
, *ip
, regno
);
1517 INSERT_OPERAND (RD
, *ip
, regno
);
1520 INSERT_OPERAND (RS2
, *ip
, regno
);
1527 case 'D': /* Floating point rd. */
1528 case 'S': /* Floating point rs1. */
1529 case 'T': /* Floating point rs2. */
1530 case 'U': /* Floating point rs1 and rs2. */
1531 case 'R': /* Floating point rs3. */
1532 if (reg_lookup (&s
, RCLASS_FPR
, ®no
))
1540 INSERT_OPERAND (RD
, *ip
, regno
);
1543 INSERT_OPERAND (RS1
, *ip
, regno
);
1546 INSERT_OPERAND (RS1
, *ip
, regno
);
1549 INSERT_OPERAND (RS2
, *ip
, regno
);
1552 INSERT_OPERAND (RS3
, *ip
, regno
);
1561 my_getExpression (imm_expr
, s
);
1562 if (imm_expr
->X_op
!= O_big
1563 && imm_expr
->X_op
!= O_constant
)
1565 normalize_constant_expr (imm_expr
);
1570 my_getExpression (imm_expr
, s
);
1571 normalize_constant_expr (imm_expr
);
1572 /* The 'A' format specifier must be a symbol. */
1573 if (imm_expr
->X_op
!= O_symbol
)
1575 *imm_reloc
= BFD_RELOC_32
;
1579 case 'j': /* Sign-extended immediate. */
1580 *imm_reloc
= BFD_RELOC_RISCV_LO12_I
;
1581 p
= percent_op_itype
;
1583 case 'q': /* Store displacement. */
1584 p
= percent_op_stype
;
1585 *imm_reloc
= BFD_RELOC_RISCV_LO12_S
;
1587 case 'o': /* Load displacement. */
1588 p
= percent_op_itype
;
1589 *imm_reloc
= BFD_RELOC_RISCV_LO12_I
;
1591 case '0': /* AMO "displacement," which must be zero. */
1592 p
= percent_op_rtype
;
1593 *imm_reloc
= BFD_RELOC_UNUSED
;
1595 /* Check whether there is only a single bracketed expression
1596 left. If so, it must be the base register and the
1597 constant must be zero. */
1598 imm_expr
->X_op
= O_constant
;
1599 imm_expr
->X_add_number
= 0;
1600 if (*s
== '(' && strchr (s
+ 1, '(') == 0)
1603 /* If this value won't fit into a 16 bit offset, then go
1604 find a macro that will generate the 32 bit offset
1606 if (!my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
))
1608 normalize_constant_expr (imm_expr
);
1609 if (imm_expr
->X_op
!= O_constant
1610 || (*args
== '0' && imm_expr
->X_add_number
!= 0)
1611 || imm_expr
->X_add_number
>= (signed)RISCV_IMM_REACH
/2
1612 || imm_expr
->X_add_number
< -(signed)RISCV_IMM_REACH
/2)
1619 case 'p': /* PC-relative offset. */
1621 *imm_reloc
= BFD_RELOC_12_PCREL
;
1622 my_getExpression (imm_expr
, s
);
1626 case 'u': /* Upper 20 bits. */
1627 p
= percent_op_utype
;
1628 if (!my_getSmallExpression (imm_expr
, imm_reloc
, s
, p
)
1629 && imm_expr
->X_op
== O_constant
)
1631 if (imm_expr
->X_add_number
< 0
1632 || imm_expr
->X_add_number
>= (signed)RISCV_BIGIMM_REACH
)
1633 as_bad (_("lui expression not in range 0..1048575"));
1635 *imm_reloc
= BFD_RELOC_RISCV_HI20
;
1636 imm_expr
->X_add_number
<<= RISCV_IMM_BITS
;
1641 case 'a': /* 20-bit PC-relative offset. */
1643 my_getExpression (imm_expr
, s
);
1645 *imm_reloc
= BFD_RELOC_RISCV_JMP
;
1649 my_getExpression (imm_expr
, s
);
1651 if (strcmp (s
, "@plt") == 0)
1653 *imm_reloc
= BFD_RELOC_RISCV_CALL_PLT
;
1657 *imm_reloc
= BFD_RELOC_RISCV_CALL
;
1661 as_fatal (_("internal error: bad argument type %c"), *args
);
1666 error
= _("illegal operands");
1670 /* Restore the character we might have clobbered above. */
1672 *(argsStart
- 1) = save_c
;
1678 md_assemble (char *str
)
1680 struct riscv_cl_insn insn
;
1681 expressionS imm_expr
;
1682 bfd_reloc_code_real_type imm_reloc
= BFD_RELOC_UNUSED
;
1684 const char *error
= riscv_ip (str
, &insn
, &imm_expr
, &imm_reloc
);
1688 as_bad ("%s `%s'", error
, str
);
1692 if (insn
.insn_mo
->pinfo
== INSN_MACRO
)
1693 macro (&insn
, &imm_expr
, &imm_reloc
);
1695 append_insn (&insn
, &imm_expr
, imm_reloc
);
1699 md_atof (int type
, char *litP
, int *sizeP
)
1701 return ieee_md_atof (type
, litP
, sizeP
, TARGET_BYTES_BIG_ENDIAN
);
1705 md_number_to_chars (char *buf
, valueT val
, int n
)
1707 number_to_chars_littleendian (buf
, val
, n
);
1710 const char *md_shortopts
= "O::g::G:";
1714 OPTION_MARCH
= OPTION_MD_BASE
,
1721 struct option md_longopts
[] =
1723 {"march", required_argument
, NULL
, OPTION_MARCH
},
1724 {"fPIC", no_argument
, NULL
, OPTION_PIC
},
1725 {"fpic", no_argument
, NULL
, OPTION_PIC
},
1726 {"fno-pic", no_argument
, NULL
, OPTION_NO_PIC
},
1727 {"mabi", required_argument
, NULL
, OPTION_MABI
},
1729 {NULL
, no_argument
, NULL
, 0}
1731 size_t md_longopts_size
= sizeof (md_longopts
);
1734 FLOAT_ABI_DEFAULT
= -1,
1740 static enum float_abi float_abi
= FLOAT_ABI_DEFAULT
;
1743 riscv_set_abi (unsigned new_xlen
, enum float_abi new_float_abi
)
1745 abi_xlen
= new_xlen
;
1746 float_abi
= new_float_abi
;
1750 md_parse_option (int c
, const char *arg
)
1755 riscv_set_arch (arg
);
1759 riscv_opts
.pic
= FALSE
;
1763 riscv_opts
.pic
= TRUE
;
1767 if (strcmp (arg
, "ilp32") == 0)
1768 riscv_set_abi (32, FLOAT_ABI_SOFT
);
1769 else if (strcmp (arg
, "ilp32f") == 0)
1770 riscv_set_abi (32, FLOAT_ABI_SINGLE
);
1771 else if (strcmp (arg
, "ilp32d") == 0)
1772 riscv_set_abi (32, FLOAT_ABI_DOUBLE
);
1773 else if (strcmp (arg
, "ilp32q") == 0)
1774 riscv_set_abi (32, FLOAT_ABI_QUAD
);
1775 else if (strcmp (arg
, "lp64") == 0)
1776 riscv_set_abi (64, FLOAT_ABI_SOFT
);
1777 else if (strcmp (arg
, "lp64f") == 0)
1778 riscv_set_abi (64, FLOAT_ABI_SINGLE
);
1779 else if (strcmp (arg
, "lp64d") == 0)
1780 riscv_set_abi (64, FLOAT_ABI_DOUBLE
);
1781 else if (strcmp (arg
, "lp64q") == 0)
1782 riscv_set_abi (64, FLOAT_ABI_QUAD
);
1795 riscv_after_parse_args (void)
1799 if (strcmp (default_arch
, "riscv32") == 0)
1801 else if (strcmp (default_arch
, "riscv64") == 0)
1804 as_bad ("unknown default architecture `%s'", default_arch
);
1807 if (riscv_subsets
== NULL
)
1808 riscv_set_arch (xlen
== 64 ? "rv64g" : "rv32g");
1810 /* Add the RVC extension, regardless of -march, to support .option rvc. */
1811 if (riscv_subset_supports ("c"))
1812 riscv_set_rvc (TRUE
);
1814 riscv_add_subset ("c");
1816 /* Infer ABI from ISA if not specified on command line. */
1819 else if (abi_xlen
> xlen
)
1820 as_bad ("can't have %d-bit ABI on %d-bit ISA", abi_xlen
, xlen
);
1821 else if (abi_xlen
< xlen
)
1822 as_bad ("%d-bit ABI not yet supported on %d-bit ISA", abi_xlen
, xlen
);
1824 if (float_abi
== FLOAT_ABI_DEFAULT
)
1826 struct riscv_subset
*subset
;
1828 /* Assume soft-float unless D extension is present. */
1829 float_abi
= FLOAT_ABI_SOFT
;
1831 for (subset
= riscv_subsets
; subset
!= NULL
; subset
= subset
->next
)
1833 if (strcasecmp (subset
->name
, "D") == 0)
1834 float_abi
= FLOAT_ABI_DOUBLE
;
1835 if (strcasecmp (subset
->name
, "Q") == 0)
1836 float_abi
= FLOAT_ABI_QUAD
;
1840 /* Insert float_abi into the EF_RISCV_FLOAT_ABI field of elf_flags. */
1841 elf_flags
|= float_abi
* (EF_RISCV_FLOAT_ABI
& ~(EF_RISCV_FLOAT_ABI
<< 1));
1845 md_pcrel_from (fixS
*fixP
)
1847 return fixP
->fx_where
+ fixP
->fx_frag
->fr_address
;
1850 /* Apply a fixup to the object file. */
1853 md_apply_fix (fixS
*fixP
, valueT
*valP
, segT seg ATTRIBUTE_UNUSED
)
1855 unsigned int subtype
;
1856 bfd_byte
*buf
= (bfd_byte
*) (fixP
->fx_frag
->fr_literal
+ fixP
->fx_where
);
1857 bfd_boolean relaxable
= FALSE
;
1860 /* Remember value for tc_gen_reloc. */
1861 fixP
->fx_addnumber
= *valP
;
1863 switch (fixP
->fx_r_type
)
1865 case BFD_RELOC_RISCV_HI20
:
1866 case BFD_RELOC_RISCV_LO12_I
:
1867 case BFD_RELOC_RISCV_LO12_S
:
1868 bfd_putl32 (riscv_apply_const_reloc (fixP
->fx_r_type
, *valP
)
1869 | bfd_getl32 (buf
), buf
);
1870 if (fixP
->fx_addsy
== NULL
)
1871 fixP
->fx_done
= TRUE
;
1875 case BFD_RELOC_RISCV_GOT_HI20
:
1876 case BFD_RELOC_RISCV_PCREL_HI20
:
1877 case BFD_RELOC_RISCV_ADD8
:
1878 case BFD_RELOC_RISCV_ADD16
:
1879 case BFD_RELOC_RISCV_ADD32
:
1880 case BFD_RELOC_RISCV_ADD64
:
1881 case BFD_RELOC_RISCV_SUB6
:
1882 case BFD_RELOC_RISCV_SUB8
:
1883 case BFD_RELOC_RISCV_SUB16
:
1884 case BFD_RELOC_RISCV_SUB32
:
1885 case BFD_RELOC_RISCV_SUB64
:
1886 case BFD_RELOC_RISCV_RELAX
:
1889 case BFD_RELOC_RISCV_TPREL_HI20
:
1890 case BFD_RELOC_RISCV_TPREL_LO12_I
:
1891 case BFD_RELOC_RISCV_TPREL_LO12_S
:
1892 case BFD_RELOC_RISCV_TPREL_ADD
:
1896 case BFD_RELOC_RISCV_TLS_GOT_HI20
:
1897 case BFD_RELOC_RISCV_TLS_GD_HI20
:
1898 case BFD_RELOC_RISCV_TLS_DTPREL32
:
1899 case BFD_RELOC_RISCV_TLS_DTPREL64
:
1900 if (fixP
->fx_addsy
!= NULL
)
1901 S_SET_THREAD_LOCAL (fixP
->fx_addsy
);
1903 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1904 _("TLS relocation against a constant"));
1911 case BFD_RELOC_RISCV_CFA
:
1912 if (fixP
->fx_addsy
&& fixP
->fx_subsy
)
1914 fixP
->fx_next
= xmemdup (fixP
, sizeof (*fixP
), sizeof (*fixP
));
1915 fixP
->fx_next
->fx_addsy
= fixP
->fx_subsy
;
1916 fixP
->fx_next
->fx_subsy
= NULL
;
1917 fixP
->fx_next
->fx_offset
= 0;
1918 fixP
->fx_subsy
= NULL
;
1920 switch (fixP
->fx_r_type
)
1923 fixP
->fx_r_type
= BFD_RELOC_RISCV_ADD64
;
1924 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB64
;
1928 fixP
->fx_r_type
= BFD_RELOC_RISCV_ADD32
;
1929 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB32
;
1933 fixP
->fx_r_type
= BFD_RELOC_RISCV_ADD16
;
1934 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB16
;
1938 fixP
->fx_r_type
= BFD_RELOC_RISCV_ADD8
;
1939 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB8
;
1942 case BFD_RELOC_RISCV_CFA
:
1943 /* Load the byte to get the subtype. */
1944 subtype
= bfd_get_8 (NULL
, &((fragS
*) (fixP
->fx_frag
->fr_opcode
))->fr_literal
[fixP
->fx_where
]);
1945 loc
= fixP
->fx_frag
->fr_fix
- (subtype
& 7);
1948 case DW_CFA_advance_loc1
:
1949 fixP
->fx_where
= loc
+ 1;
1950 fixP
->fx_next
->fx_where
= loc
+ 1;
1951 fixP
->fx_r_type
= BFD_RELOC_RISCV_SET8
;
1952 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB8
;
1955 case DW_CFA_advance_loc2
:
1957 fixP
->fx_next
->fx_size
= 2;
1958 fixP
->fx_where
= loc
+ 1;
1959 fixP
->fx_next
->fx_where
= loc
+ 1;
1960 fixP
->fx_r_type
= BFD_RELOC_RISCV_SET16
;
1961 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB16
;
1964 case DW_CFA_advance_loc4
:
1966 fixP
->fx_next
->fx_size
= 4;
1967 fixP
->fx_where
= loc
;
1968 fixP
->fx_next
->fx_where
= loc
;
1969 fixP
->fx_r_type
= BFD_RELOC_RISCV_SET32
;
1970 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB32
;
1974 if (subtype
< 0x80 && (subtype
& 0x40))
1976 /* DW_CFA_advance_loc */
1977 fixP
->fx_frag
= (fragS
*) fixP
->fx_frag
->fr_opcode
;
1978 fixP
->fx_next
->fx_frag
= fixP
->fx_frag
;
1979 fixP
->fx_r_type
= BFD_RELOC_RISCV_SET6
;
1980 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_SUB6
;
1983 as_fatal (_("internal error: bad CFA value #%d"), subtype
);
1989 /* This case is unreachable. */
1996 /* If we are deleting this reloc entry, we must fill in the
1997 value now. This can happen if we have a .word which is not
1998 resolved when it appears but is later defined. */
1999 if (fixP
->fx_addsy
== NULL
)
2001 gas_assert (fixP
->fx_size
<= sizeof (valueT
));
2002 md_number_to_chars ((char *) buf
, *valP
, fixP
->fx_size
);
2007 case BFD_RELOC_RISCV_JMP
:
2010 /* Fill in a tentative value to improve objdump readability. */
2011 bfd_vma target
= S_GET_VALUE (fixP
->fx_addsy
) + *valP
;
2012 bfd_vma delta
= target
- md_pcrel_from (fixP
);
2013 bfd_putl32 (bfd_getl32 (buf
) | ENCODE_UJTYPE_IMM (delta
), buf
);
2017 case BFD_RELOC_12_PCREL
:
2020 /* Fill in a tentative value to improve objdump readability. */
2021 bfd_vma target
= S_GET_VALUE (fixP
->fx_addsy
) + *valP
;
2022 bfd_vma delta
= target
- md_pcrel_from (fixP
);
2023 bfd_putl32 (bfd_getl32 (buf
) | ENCODE_SBTYPE_IMM (delta
), buf
);
2027 case BFD_RELOC_RISCV_RVC_BRANCH
:
2030 /* Fill in a tentative value to improve objdump readability. */
2031 bfd_vma target
= S_GET_VALUE (fixP
->fx_addsy
) + *valP
;
2032 bfd_vma delta
= target
- md_pcrel_from (fixP
);
2033 bfd_putl16 (bfd_getl16 (buf
) | ENCODE_RVC_B_IMM (delta
), buf
);
2037 case BFD_RELOC_RISCV_RVC_JUMP
:
2040 /* Fill in a tentative value to improve objdump readability. */
2041 bfd_vma target
= S_GET_VALUE (fixP
->fx_addsy
) + *valP
;
2042 bfd_vma delta
= target
- md_pcrel_from (fixP
);
2043 bfd_putl16 (bfd_getl16 (buf
) | ENCODE_RVC_J_IMM (delta
), buf
);
2047 case BFD_RELOC_RISCV_CALL
:
2048 case BFD_RELOC_RISCV_CALL_PLT
:
2052 case BFD_RELOC_RISCV_PCREL_LO12_S
:
2053 case BFD_RELOC_RISCV_PCREL_LO12_I
:
2054 case BFD_RELOC_RISCV_ALIGN
:
2058 /* We ignore generic BFD relocations we don't know about. */
2059 if (bfd_reloc_type_lookup (stdoutput
, fixP
->fx_r_type
) != NULL
)
2060 as_fatal (_("internal error: bad relocation #%d"), fixP
->fx_r_type
);
2063 if (fixP
->fx_subsy
!= NULL
)
2064 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
2065 _("unsupported symbol subtraction"));
2067 /* Add an R_RISCV_RELAX reloc if the reloc is relaxable. */
2068 if (relaxable
&& fixP
->fx_tcbit
&& fixP
->fx_addsy
!= NULL
)
2070 fixP
->fx_next
= xmemdup (fixP
, sizeof (*fixP
), sizeof (*fixP
));
2071 fixP
->fx_next
->fx_addsy
= fixP
->fx_next
->fx_subsy
= NULL
;
2072 fixP
->fx_next
->fx_r_type
= BFD_RELOC_RISCV_RELAX
;
2076 /* Because the value of .cfi_remember_state may changed after relaxation,
2077 we insert a fix to relocate it again in link-time. */
2080 riscv_pre_output_hook (void)
2082 const frchainS
*frch
;
2085 for (s
= stdoutput
->sections
; s
; s
= s
->next
)
2086 for (frch
= seg_info (s
)->frchainP
; frch
; frch
= frch
->frch_next
)
2090 for (frag
= frch
->frch_root
; frag
; frag
= frag
->fr_next
)
2092 if (frag
->fr_type
== rs_cfa
)
2096 symbolS
*add_symbol
= frag
->fr_symbol
->sy_value
.X_add_symbol
;
2097 symbolS
*op_symbol
= frag
->fr_symbol
->sy_value
.X_op_symbol
;
2099 exp
.X_op
= O_subtract
;
2100 exp
.X_add_symbol
= add_symbol
;
2101 exp
.X_add_number
= 0;
2102 exp
.X_op_symbol
= op_symbol
;
2104 fix_new_exp (frag
, (int) frag
->fr_offset
, 1, &exp
, 0,
2105 BFD_RELOC_RISCV_CFA
);
2112 /* This structure is used to hold a stack of .option values. */
2114 struct riscv_option_stack
2116 struct riscv_option_stack
*next
;
2117 struct riscv_set_options options
;
2120 static struct riscv_option_stack
*riscv_opts_stack
;
2122 /* Handle the .option pseudo-op. */
2125 s_riscv_option (int x ATTRIBUTE_UNUSED
)
2127 char *name
= input_line_pointer
, ch
;
2129 while (!is_end_of_line
[(unsigned char) *input_line_pointer
])
2130 ++input_line_pointer
;
2131 ch
= *input_line_pointer
;
2132 *input_line_pointer
= '\0';
2134 if (strcmp (name
, "rvc") == 0)
2135 riscv_set_rvc (TRUE
);
2136 else if (strcmp (name
, "norvc") == 0)
2137 riscv_set_rvc (FALSE
);
2138 else if (strcmp (name
, "pic") == 0)
2139 riscv_opts
.pic
= TRUE
;
2140 else if (strcmp (name
, "nopic") == 0)
2141 riscv_opts
.pic
= FALSE
;
2142 else if (strcmp (name
, "relax") == 0)
2143 riscv_opts
.relax
= TRUE
;
2144 else if (strcmp (name
, "norelax") == 0)
2145 riscv_opts
.relax
= FALSE
;
2146 else if (strcmp (name
, "push") == 0)
2148 struct riscv_option_stack
*s
;
2150 s
= (struct riscv_option_stack
*) xmalloc (sizeof *s
);
2151 s
->next
= riscv_opts_stack
;
2152 s
->options
= riscv_opts
;
2153 riscv_opts_stack
= s
;
2155 else if (strcmp (name
, "pop") == 0)
2157 struct riscv_option_stack
*s
;
2159 s
= riscv_opts_stack
;
2161 as_bad (_(".option pop with no .option push"));
2164 riscv_opts
= s
->options
;
2165 riscv_opts_stack
= s
->next
;
2171 as_warn (_("Unrecognized .option directive: %s\n"), name
);
2173 *input_line_pointer
= ch
;
2174 demand_empty_rest_of_line ();
2177 /* Handle the .dtprelword and .dtpreldword pseudo-ops. They generate
2178 a 32-bit or 64-bit DTP-relative relocation (BYTES says which) for
2179 use in DWARF debug information. */
2182 s_dtprel (int bytes
)
2189 if (ex
.X_op
!= O_symbol
)
2191 as_bad (_("Unsupported use of %s"), (bytes
== 8
2194 ignore_rest_of_line ();
2197 p
= frag_more (bytes
);
2198 md_number_to_chars (p
, 0, bytes
);
2199 fix_new_exp (frag_now
, p
- frag_now
->fr_literal
, bytes
, &ex
, FALSE
,
2201 ? BFD_RELOC_RISCV_TLS_DTPREL64
2202 : BFD_RELOC_RISCV_TLS_DTPREL32
));
2204 demand_empty_rest_of_line ();
2207 /* Handle the .bss pseudo-op. */
2210 s_bss (int ignore ATTRIBUTE_UNUSED
)
2212 subseg_set (bss_section
, 0);
2213 demand_empty_rest_of_line ();
2217 riscv_make_nops (char *buf
, bfd_vma bytes
)
2221 /* RISC-V instructions cannot begin or end on odd addresses, so this case
2222 means we are not within a valid instruction sequence. It is thus safe
2223 to use a zero byte, even though that is not a valid instruction. */
2227 /* Use at most one 2-byte NOP. */
2228 if ((bytes
- i
) % 4 == 2)
2230 md_number_to_chars (buf
+ i
, RVC_NOP
, 2);
2234 /* Fill the remainder with 4-byte NOPs. */
2235 for ( ; i
< bytes
; i
+= 4)
2236 md_number_to_chars (buf
+ i
, RISCV_NOP
, 4);
2239 /* Called from md_do_align. Used to create an alignment frag in a
2240 code section by emitting a worst-case NOP sequence that the linker
2241 will later relax to the correct number of NOPs. We can't compute
2242 the correct alignment now because of other linker relaxations. */
2245 riscv_frag_align_code (int n
)
2247 bfd_vma bytes
= (bfd_vma
) 1 << n
;
2248 bfd_vma min_text_alignment_order
= riscv_opts
.rvc
? 1 : 2;
2249 bfd_vma min_text_alignment
= (bfd_vma
) 1 << min_text_alignment_order
;
2251 /* First, get back to minimal alignment. */
2252 frag_align_code (min_text_alignment_order
, 0);
2254 /* When not relaxing, riscv_handle_align handles code alignment. */
2255 if (!riscv_opts
.relax
)
2258 if (bytes
> min_text_alignment
)
2260 bfd_vma worst_case_bytes
= bytes
- min_text_alignment
;
2261 char *nops
= frag_more (worst_case_bytes
);
2264 ex
.X_op
= O_constant
;
2265 ex
.X_add_number
= worst_case_bytes
;
2267 riscv_make_nops (nops
, worst_case_bytes
);
2269 fix_new_exp (frag_now
, nops
- frag_now
->fr_literal
, 0,
2270 &ex
, FALSE
, BFD_RELOC_RISCV_ALIGN
);
2276 /* Implement HANDLE_ALIGN. */
2279 riscv_handle_align (fragS
*fragP
)
2281 switch (fragP
->fr_type
)
2284 /* When relaxing, riscv_frag_align_code handles code alignment. */
2285 if (!riscv_opts
.relax
)
2287 bfd_signed_vma count
= fragP
->fr_next
->fr_address
2288 - fragP
->fr_address
- fragP
->fr_fix
;
2293 count
&= MAX_MEM_FOR_RS_ALIGN_CODE
;
2294 riscv_make_nops (fragP
->fr_literal
+ fragP
->fr_fix
, count
);
2295 fragP
->fr_var
= count
;
2305 md_estimate_size_before_relax (fragS
*fragp
, asection
*segtype
)
2307 return (fragp
->fr_var
= relaxed_branch_length (fragp
, segtype
, FALSE
));
2310 /* Translate internal representation of relocation info to BFD target
2314 tc_gen_reloc (asection
*section ATTRIBUTE_UNUSED
, fixS
*fixp
)
2316 arelent
*reloc
= (arelent
*) xmalloc (sizeof (arelent
));
2318 reloc
->sym_ptr_ptr
= (asymbol
**) xmalloc (sizeof (asymbol
*));
2319 *reloc
->sym_ptr_ptr
= symbol_get_bfdsym (fixp
->fx_addsy
);
2320 reloc
->address
= fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
2321 reloc
->addend
= fixp
->fx_addnumber
;
2323 reloc
->howto
= bfd_reloc_type_lookup (stdoutput
, fixp
->fx_r_type
);
2324 if (reloc
->howto
== NULL
)
2326 if ((fixp
->fx_r_type
== BFD_RELOC_16
|| fixp
->fx_r_type
== BFD_RELOC_8
)
2327 && fixp
->fx_addsy
!= NULL
&& fixp
->fx_subsy
!= NULL
)
2329 /* We don't have R_RISCV_8/16, but for this special case,
2330 we can use R_RISCV_ADD8/16 with R_RISCV_SUB8/16. */
2334 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
2335 _("cannot represent %s relocation in object file"),
2336 bfd_get_reloc_code_name (fixp
->fx_r_type
));
2344 riscv_relax_frag (asection
*sec
, fragS
*fragp
, long stretch ATTRIBUTE_UNUSED
)
2346 if (RELAX_BRANCH_P (fragp
->fr_subtype
))
2348 offsetT old_var
= fragp
->fr_var
;
2349 fragp
->fr_var
= relaxed_branch_length (fragp
, sec
, TRUE
);
2350 return fragp
->fr_var
- old_var
;
2356 /* Expand far branches to multi-instruction sequences. */
2359 md_convert_frag_branch (fragS
*fragp
)
2367 buf
= (bfd_byte
*)fragp
->fr_literal
+ fragp
->fr_fix
;
2369 exp
.X_op
= O_symbol
;
2370 exp
.X_add_symbol
= fragp
->fr_symbol
;
2371 exp
.X_add_number
= fragp
->fr_offset
;
2373 gas_assert (fragp
->fr_var
== RELAX_BRANCH_LENGTH (fragp
->fr_subtype
));
2375 if (RELAX_BRANCH_RVC (fragp
->fr_subtype
))
2377 switch (RELAX_BRANCH_LENGTH (fragp
->fr_subtype
))
2381 /* Expand the RVC branch into a RISC-V one. */
2382 insn
= bfd_getl16 (buf
);
2383 rs1
= 8 + ((insn
>> OP_SH_CRS1S
) & OP_MASK_CRS1S
);
2384 if ((insn
& MASK_C_J
) == MATCH_C_J
)
2386 else if ((insn
& MASK_C_JAL
) == MATCH_C_JAL
)
2387 insn
= MATCH_JAL
| (X_RA
<< OP_SH_RD
);
2388 else if ((insn
& MASK_C_BEQZ
) == MATCH_C_BEQZ
)
2389 insn
= MATCH_BEQ
| (rs1
<< OP_SH_RS1
);
2390 else if ((insn
& MASK_C_BNEZ
) == MATCH_C_BNEZ
)
2391 insn
= MATCH_BNE
| (rs1
<< OP_SH_RS1
);
2394 bfd_putl32 (insn
, buf
);
2398 /* Invert the branch condition. Branch over the jump. */
2399 insn
= bfd_getl16 (buf
);
2400 insn
^= MATCH_C_BEQZ
^ MATCH_C_BNEZ
;
2401 insn
|= ENCODE_RVC_B_IMM (6);
2402 bfd_putl16 (insn
, buf
);
2407 /* Just keep the RVC branch. */
2408 reloc
= RELAX_BRANCH_UNCOND (fragp
->fr_subtype
)
2409 ? BFD_RELOC_RISCV_RVC_JUMP
: BFD_RELOC_RISCV_RVC_BRANCH
;
2410 fixp
= fix_new_exp (fragp
, buf
- (bfd_byte
*)fragp
->fr_literal
,
2411 2, &exp
, FALSE
, reloc
);
2420 switch (RELAX_BRANCH_LENGTH (fragp
->fr_subtype
))
2423 gas_assert (!RELAX_BRANCH_UNCOND (fragp
->fr_subtype
));
2425 /* Invert the branch condition. Branch over the jump. */
2426 insn
= bfd_getl32 (buf
);
2427 insn
^= MATCH_BEQ
^ MATCH_BNE
;
2428 insn
|= ENCODE_SBTYPE_IMM (8);
2429 md_number_to_chars ((char *) buf
, insn
, 4);
2433 /* Jump to the target. */
2434 fixp
= fix_new_exp (fragp
, buf
- (bfd_byte
*)fragp
->fr_literal
,
2435 4, &exp
, FALSE
, BFD_RELOC_RISCV_JMP
);
2436 md_number_to_chars ((char *) buf
, MATCH_JAL
, 4);
2441 reloc
= RELAX_BRANCH_UNCOND (fragp
->fr_subtype
)
2442 ? BFD_RELOC_RISCV_JMP
: BFD_RELOC_12_PCREL
;
2443 fixp
= fix_new_exp (fragp
, buf
- (bfd_byte
*)fragp
->fr_literal
,
2444 4, &exp
, FALSE
, reloc
);
2453 fixp
->fx_file
= fragp
->fr_file
;
2454 fixp
->fx_line
= fragp
->fr_line
;
2456 gas_assert (buf
== (bfd_byte
*)fragp
->fr_literal
2457 + fragp
->fr_fix
+ fragp
->fr_var
);
2459 fragp
->fr_fix
+= fragp
->fr_var
;
2462 /* Relax a machine dependent frag. This returns the amount by which
2463 the current size of the frag should change. */
2466 md_convert_frag (bfd
*abfd ATTRIBUTE_UNUSED
, segT asec ATTRIBUTE_UNUSED
,
2469 gas_assert (RELAX_BRANCH_P (fragp
->fr_subtype
));
2470 md_convert_frag_branch (fragp
);
2474 md_show_usage (FILE *stream
)
2476 fprintf (stream
, _("\
2478 -fpic generate position-independent code\n\
2479 -fno-pic don't generate position-independent code (default)\n\
2480 -march=ISA set the RISC-V architecture\n\
2481 -mabi=ABI set the RISC-V ABI\n\
2485 /* Standard calling conventions leave the CFA at SP on entry. */
2487 riscv_cfi_frame_initial_instructions (void)
2489 cfi_add_CFA_def_cfa_register (X_SP
);
2493 tc_riscv_regname_to_dw2regnum (char *regname
)
2497 if ((reg
= reg_lookup_internal (regname
, RCLASS_GPR
)) >= 0)
2500 if ((reg
= reg_lookup_internal (regname
, RCLASS_FPR
)) >= 0)
2503 as_bad (_("unknown register `%s'"), regname
);
2508 riscv_elf_final_processing (void)
2510 elf_elfheader (stdoutput
)->e_flags
|= elf_flags
;
2513 /* Parse the .sleb128 and .uleb128 pseudos. Only allow constant expressions,
2514 since these directives break relaxation when used with symbol deltas. */
2517 s_riscv_leb128 (int sign
)
2520 char *save_in
= input_line_pointer
;
2523 if (exp
.X_op
!= O_constant
)
2524 as_bad (_("non-constant .%cleb128 is not supported"), sign
? 's' : 'u');
2525 demand_empty_rest_of_line ();
2527 input_line_pointer
= save_in
;
2528 return s_leb128 (sign
);
2531 /* Pseudo-op table. */
2533 static const pseudo_typeS riscv_pseudo_table
[] =
2535 /* RISC-V-specific pseudo-ops. */
2536 {"option", s_riscv_option
, 0},
2540 {"dtprelword", s_dtprel
, 4},
2541 {"dtpreldword", s_dtprel
, 8},
2543 {"uleb128", s_riscv_leb128
, 0},
2544 {"sleb128", s_riscv_leb128
, 1},
2550 riscv_pop_insert (void)
2552 extern void pop_insert (const pseudo_typeS
*);
2554 pop_insert (riscv_pseudo_table
);