/* GAS interface for targets using CGEN: Cpu tools GENerator.
- Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1996-2020 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
- GAS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
+ GAS is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+#include "as.h"
#include <setjmp.h>
-#include "ansidecl.h"
-#include "libiberty.h"
-#include "bfd.h"
#include "symcat.h"
#include "cgen-desc.h"
-#include "as.h"
#include "subsegs.h"
#include "cgen.h"
#include "dwarf2dbg.h"
+#include "symbols.h"
+
+#ifdef OBJ_COMPLEX_RELC
+static expressionS * make_right_shifted_expr
+ (expressionS *, const int, const int);
+
+static unsigned long gas_cgen_encode_addend
+ (const unsigned long, const unsigned long, const unsigned long, \
+ const unsigned long, const unsigned long, const unsigned long, \
+ const unsigned long);
+
+static const char * weak_operand_overflow_check
+ (const expressionS *, const CGEN_OPERAND *);
+
+static void queue_fixup_recursively
+ (const int, const int, expressionS *, \
+ const CGEN_MAYBE_MULTI_IFLD *, const int, const int);
+
+static int rightshift = 0;
+#endif
static void queue_fixup (int, int, expressionS *);
/* Opcode table descriptor, must be set by md_begin. */
??? Not currently used. */
void
-cgen_asm_record_register (name, number)
- char *name;
- int number;
+cgen_asm_record_register (char *name, int number)
{
/* Use symbol_create here instead of symbol_new so we don't try to
output registers into the object file's symbol table. */
int opindex;
int opinfo;
expressionS exp;
+ struct cgen_maybe_multi_ifield * field;
+ int msb_field_p;
};
static struct fixup fixups[GAS_CGEN_MAX_FIXUPS];
??? May wish to make this static and delete calls in md_assemble. */
void
-gas_cgen_init_parse ()
+gas_cgen_init_parse (void)
{
num_fixups = 0;
}
/* Queue a fixup. */
static void
-queue_fixup (opindex, opinfo, expP)
- int opindex;
- int opinfo;
- expressionS * expP;
+queue_fixup (int opindex, int opinfo, expressionS *expP)
{
/* We need to generate a fixup for this expression. */
if (num_fixups >= GAS_CGEN_MAX_FIXUPS)
static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS];
void
-gas_cgen_initialize_saved_fixups_array ()
+gas_cgen_initialize_saved_fixups_array (void)
{
int i = 0;
}
void
-gas_cgen_save_fixups (i)
- int i;
+gas_cgen_save_fixups (int i)
{
if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
{
}
void
-gas_cgen_restore_fixups (i)
- int i;
+gas_cgen_restore_fixups (int i)
{
if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
{
}
void
-gas_cgen_swap_fixups (i)
- int i;
+gas_cgen_swap_fixups (int i)
{
if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
{
At this point we do not use a bfd_reloc_code_real_type for
operands residing in the insn, but instead just use the
operand index. This lets us easily handle fixups for any
- operand type. We pick a BFD reloc type in md_apply_fix3. */
+ operand type. We pick a BFD reloc type in md_apply_fix. */
fixS *
-gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset)
- fragS * frag;
- int where;
- const CGEN_INSN * insn;
- int length;
- const CGEN_OPERAND * operand;
- int opinfo;
- symbolS * symbol;
- offsetT offset;
+gas_cgen_record_fixup (fragS *frag, int where, const CGEN_INSN *insn,
+ int length, const CGEN_OPERAND *operand, int opinfo,
+ symbolS *symbol, offsetT offset)
{
fixS *fixP;
+ (int) operand->type));
fixP->fx_cgen.insn = insn;
fixP->fx_cgen.opinfo = opinfo;
+ fixP->fx_cgen.field = NULL;
+ fixP->fx_cgen.msb_field_p = 0;
return fixP;
}
At this point we do not use a bfd_reloc_code_real_type for
operands residing in the insn, but instead just use the
operand index. This lets us easily handle fixups for any
- operand type. We pick a BFD reloc type in md_apply_fix3. */
+ operand type. We pick a BFD reloc type in md_apply_fix. */
fixS *
-gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp)
- fragS * frag;
- int where;
- const CGEN_INSN * insn;
- int length;
- const CGEN_OPERAND * operand;
- int opinfo;
- expressionS * exp;
+gas_cgen_record_fixup_exp (fragS *frag, int where, const CGEN_INSN *insn,
+ int length, const CGEN_OPERAND *operand, int opinfo,
+ expressionS *exp)
{
fixS *fixP;
+ (int) operand->type));
fixP->fx_cgen.insn = insn;
fixP->fx_cgen.opinfo = opinfo;
+ fixP->fx_cgen.field = NULL;
+ fixP->fx_cgen.msb_field_p = 0;
return fixP;
}
+#ifdef OBJ_COMPLEX_RELC
+static symbolS *
+expr_build_binary (operatorT op, symbolS * s1, symbolS * s2)
+{
+ expressionS e;
+
+ e.X_op = op;
+ e.X_add_symbol = s1;
+ e.X_op_symbol = s2;
+ e.X_add_number = 0;
+ return make_expr_symbol (& e);
+}
+#endif
+
/* Used for communication between the next two procedures. */
static jmp_buf expr_jmp_buf;
static int expr_jmp_buf_p;
The resulting value is stored in VALUEP. */
const char *
-gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP)
- CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
- enum cgen_parse_operand_type want;
- const char **strP;
- int opindex;
- int opinfo;
- enum cgen_parse_operand_result *resultP;
- bfd_vma *valueP;
+gas_cgen_parse_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+ enum cgen_parse_operand_type want, const char **strP,
+ int opindex, int opinfo,
+ enum cgen_parse_operand_result *resultP,
+ bfd_vma *valueP)
{
#ifdef __STDC__
/* These are volatile to survive the setjmp. */
const char *errmsg;
expressionS exp;
+#ifdef OBJ_COMPLEX_RELC
+ volatile int signed_p = 0;
+ symbolS * stmp = NULL;
+ bfd_reloc_code_real_type reloc_type;
+ const CGEN_OPERAND * operand;
+ fixS dummy_fixup;
+#endif
if (want == CGEN_PARSE_OPERAND_INIT)
{
gas_cgen_init_parse ();
#ifdef TC_CGEN_PARSE_FIX_EXP
opinfo_1 = TC_CGEN_PARSE_FIX_EXP (opinfo_1, & exp);
-#endif
+#endif
/* FIXME: Need to check `want'. */
break;
de_fault:
default:
+#ifdef OBJ_COMPLEX_RELC
+ /* Look up operand, check to see if there's an obvious
+ overflow (this helps disambiguate some insn parses). */
+ operand = cgen_operand_lookup_by_num (cd, opindex);
+ errmsg = weak_operand_overflow_check (& exp, operand);
+
+ if (! errmsg)
+ {
+ asymbol *bsym;
+
+ /* Fragment the expression as necessary, and queue a reloc. */
+ memset (& dummy_fixup, 0, sizeof (fixS));
+
+ reloc_type = md_cgen_lookup_reloc (0, operand, & dummy_fixup);
+
+ if (exp.X_op == O_symbol
+ && reloc_type == BFD_RELOC_RELC
+ && symbol_constant_p (exp.X_add_symbol)
+ && (!symbol_symbolS (exp.X_add_symbol)
+ || (bsym = symbol_get_bfdsym (exp.X_add_symbol)) == NULL
+ || (bsym->section != expr_section
+ && bsym->section != absolute_section
+ && bsym->section != undefined_section)))
+ {
+ /* Local labels will have been (eagerly) turned into constants
+ by now, due to the inappropriately deep insight of the
+ expression parser. Unfortunately make_expr_symbol
+ prematurely dives into the symbol evaluator, and in this
+ case it gets a bad answer, so we manually create the
+ expression symbol we want here. */
+ stmp = symbol_create (FAKE_LABEL_NAME, expr_section, 0,
+ & zero_address_frag);
+ symbol_set_value_expression (stmp, & exp);
+ }
+ else
+ stmp = make_expr_symbol (& exp);
+
+ /* If this is a pc-relative RELC operand, we
+ need to subtract "." from the expression. */
+ if (reloc_type == BFD_RELOC_RELC
+ && CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR))
+ stmp = expr_build_binary (O_subtract, stmp, expr_build_dot ());
+
+ /* FIXME: this is not a perfect heuristic for figuring out
+ whether an operand is signed: it only works when the operand
+ is an immediate. it's not terribly likely that any other
+ values will be signed relocs, but it's possible. */
+ if (operand && (operand->hw_type == HW_H_SINT))
+ signed_p = 1;
+
+ if (symbol_symbolS (stmp)
+ && (bsym = symbol_get_bfdsym (stmp)) != NULL
+ && bsym->section == expr_section
+ && ! S_IS_LOCAL (stmp))
+ {
+ if (signed_p)
+ bsym->flags |= BSF_SRELC;
+ else
+ bsym->flags |= BSF_RELC;
+ }
+
+ /* Now package it all up for the fixup emitter. */
+ exp.X_op = O_symbol;
+ exp.X_op_symbol = 0;
+ exp.X_add_symbol = stmp;
+ exp.X_add_number = 0;
+
+ /* Re-init rightshift quantity, just in case. */
+ rightshift = operand->length;
+ queue_fixup_recursively (opindex, opinfo_1, & exp,
+ (reloc_type == BFD_RELOC_RELC) ?
+ & (operand->index_fields) : 0,
+ signed_p, -1);
+ }
+ * resultP = errmsg
+ ? CGEN_PARSE_OPERAND_RESULT_ERROR
+ : CGEN_PARSE_OPERAND_RESULT_QUEUED;
+ *valueP = 0;
+#else
queue_fixup (opindex, opinfo_1, &exp);
*valueP = 0;
*resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED;
+#endif
break;
}
??? This could be done differently by adding code to `expression'. */
void
-gas_cgen_md_operand (expressionP)
- expressionS *expressionP ATTRIBUTE_UNUSED;
+gas_cgen_md_operand (expressionS *expressionP ATTRIBUTE_UNUSED)
{
/* Don't longjmp if we're not called from within cgen_parse_operand(). */
if (expr_jmp_buf_p)
The "result" is stored in RESULT if non-NULL. */
void
-gas_cgen_finish_insn (insn, buf, length, relax_p, result)
- const CGEN_INSN *insn;
- CGEN_INSN_BYTES_PTR buf;
- unsigned int length;
- int relax_p;
- finished_insnS *result;
+gas_cgen_finish_insn (const CGEN_INSN *insn, CGEN_INSN_BYTES_PTR buf,
+ unsigned int length, int relax_p, finished_insnS *result)
{
int i;
int relax_operand;
insn, length, operand,
fixups[i].opinfo,
&fixups[i].exp);
+ fixP->fx_cgen.field = fixups[i].field;
+ fixP->fx_cgen.msb_field_p = fixups[i].msb_field_p;
if (result)
result->fixups[i] = fixP;
}
}
}
+#ifdef OBJ_COMPLEX_RELC
+/* Queue many fixups, recursively. If the field is a multi-ifield,
+ repeatedly queue its sub-parts, right shifted to fit into the field (we
+ assume here multi-fields represent a left-to-right, MSB0-LSB0
+ reading). */
+
+static void
+queue_fixup_recursively (const int opindex,
+ const int opinfo,
+ expressionS * expP,
+ const CGEN_MAYBE_MULTI_IFLD * field,
+ const int signed_p,
+ const int part_of_multi)
+{
+ if (field && field->count)
+ {
+ int i;
+
+ for (i = 0; i < field->count; ++ i)
+ queue_fixup_recursively (opindex, opinfo, expP,
+ & (field->val.multi[i]), signed_p, i);
+ }
+ else
+ {
+ expressionS * new_exp = expP;
+
+#ifdef DEBUG
+ printf ("queueing fixup for field %s\n",
+ (field ? field->val.leaf->name : "??"));
+ print_symbol_value (expP->X_add_symbol);
+#endif
+ if (field && part_of_multi != -1)
+ {
+ rightshift -= field->val.leaf->length;
+
+ /* Shift reloc value by number of bits remaining after this
+ field. */
+ if (rightshift)
+ new_exp = make_right_shifted_expr (expP, rightshift, signed_p);
+ }
+
+ /* Truncate reloc values to length, *after* leftmost one. */
+ fixups[num_fixups].msb_field_p = (part_of_multi <= 0);
+ fixups[num_fixups].field = (CGEN_MAYBE_MULTI_IFLD *) field;
+
+ queue_fixup (opindex, opinfo, new_exp);
+ }
+}
+
+/* Encode the self-describing RELC reloc format's addend. */
+
+static unsigned long
+gas_cgen_encode_addend (const unsigned long start, /* in bits */
+ const unsigned long len, /* in bits */
+ const unsigned long oplen, /* in bits */
+ const unsigned long wordsz, /* in bytes */
+ const unsigned long chunksz, /* in bytes */
+ const unsigned long signed_p,
+ const unsigned long trunc_p)
+{
+ unsigned long res = 0L;
+
+ res |= start & 0x3F;
+ res |= (oplen & 0x3F) << 6;
+ res |= (len & 0x3F) << 12;
+ res |= (wordsz & 0xF) << 18;
+ res |= (chunksz & 0xF) << 22;
+ res |= (CGEN_INSN_LSB0_P ? 1 : 0) << 27;
+ res |= signed_p << 28;
+ res |= trunc_p << 29;
+
+ return res;
+}
+
+/* Purpose: make a weak check that the expression doesn't overflow the
+ operand it's to be inserted into.
+
+ Rationale: some insns used to use %operators to disambiguate during a
+ parse. when these %operators are translated to expressions by the macro
+ expander, the ambiguity returns. we attempt to disambiguate by field
+ size.
+
+ Method: check to see if the expression's top node is an O_and operator,
+ and the mask is larger than the operand length. This would be an
+ overflow, so signal it by returning an error string. Any other case is
+ ambiguous, so we assume it's OK and return NULL. */
+
+static const char *
+weak_operand_overflow_check (const expressionS * exp,
+ const CGEN_OPERAND * operand)
+{
+ const unsigned long len = operand->length;
+ unsigned long mask;
+ unsigned long opmask = (((1L << (len - 1)) - 1) << 1) | 1;
+
+ if (!exp)
+ return NULL;
+
+ if (exp->X_op != O_bit_and)
+ {
+ /* Check for implicit overflow flag. */
+ if (CGEN_OPERAND_ATTR_VALUE
+ (operand, CGEN_OPERAND_RELOC_IMPLIES_OVERFLOW))
+ return _("a reloc on this operand implies an overflow");
+ return NULL;
+ }
+
+ mask = exp->X_add_number;
+
+ if (exp->X_add_symbol
+ && symbol_constant_p (exp->X_add_symbol))
+ mask |= *symbol_X_add_number (exp->X_add_symbol);
+
+ if (exp->X_op_symbol
+ && symbol_constant_p (exp->X_op_symbol))
+ mask |= *symbol_X_add_number (exp->X_op_symbol);
+
+ /* Want to know if mask covers more bits than opmask.
+ this is the same as asking if mask has any bits not in opmask,
+ or whether (mask & ~opmask) is nonzero. */
+ if (mask && (mask & ~opmask))
+ {
+#ifdef DEBUG
+ printf ("overflow: (mask = %8.8x, ~opmask = %8.8x, AND = %8.8x)\n",
+ mask, ~opmask, (mask & ~opmask));
+#endif
+ return _("operand mask overflow");
+ }
+
+ return NULL;
+}
+
+static expressionS *
+make_right_shifted_expr (expressionS * exp,
+ const int amount,
+ const int signed_p)
+{
+ symbolS * stmp = 0;
+ expressionS * new_exp;
+ asymbol *bsym;
+
+ stmp = expr_build_binary (O_right_shift,
+ make_expr_symbol (exp),
+ expr_build_uconstant (amount));
+ bsym = symbol_get_bfdsym (stmp);
+
+ if (signed_p)
+ bsym->flags |= BSF_SRELC;
+ else
+ bsym->flags |= BSF_RELC;
+
+ /* Then wrap that in a "symbol expr" for good measure. */
+ new_exp = XNEW (expressionS);
+ memset (new_exp, 0, sizeof (expressionS));
+ new_exp->X_op = O_symbol;
+ new_exp->X_op_symbol = 0;
+ new_exp->X_add_symbol = stmp;
+ new_exp->X_add_number = 0;
+
+ return new_exp;
+}
+
+#endif
+
/* Apply a fixup to the object code. This is called for all the
fixups we generated by the call to fix_new_exp, above. In the call
above we used a reloc code which was the largest legal reloc code
should handle them all. */
void
-gas_cgen_md_apply_fix3 (fixP, valP, seg)
- fixS * fixP;
- valueT * valP;
- segT seg ATTRIBUTE_UNUSED;
+gas_cgen_md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
{
char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
valueT value = * valP;
const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex);
const char *errmsg;
bfd_reloc_code_real_type reloc_type;
- CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd));
const CGEN_INSN *insn = fixP->fx_cgen.insn;
+#ifdef OBJ_COMPLEX_RELC
+ int start;
+ int length;
+ int signed_p = 0;
+
+ if (fixP->fx_cgen.field)
+ {
+ /* Use the twisty little pointer path
+ back to the ifield if it exists. */
+ start = fixP->fx_cgen.field->val.leaf->start;
+ length = fixP->fx_cgen.field->val.leaf->length;
+ }
+ else
+ {
+ /* Or the far less useful operand-size guesstimate. */
+ start = operand->start;
+ length = operand->length;
+ }
+
+ /* FIXME: this is not a perfect heuristic for figuring out
+ whether an operand is signed: it only works when the operand
+ is an immediate. it's not terribly likely that any other
+ values will be signed relocs, but it's possible. */
+ if (operand && (operand->hw_type == HW_H_SINT))
+ signed_p = 1;
+#endif
/* If the reloc has been fully resolved finish the operand here. */
/* FIXME: This duplicates the capabilities of code in BFD. */
finish the job. Testing for pcrel is a temporary hack. */
|| fixP->fx_pcrel)
{
+ CGEN_FIELDS *fields = xmalloc (CGEN_CPU_SIZEOF_FIELDS (cd));
+
CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn));
CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value);
#endif
if (errmsg)
as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg);
+
+ free (fields);
}
if (fixP->fx_done)
partial_inplace == false. */
reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
+#ifdef OBJ_COMPLEX_RELC
+ if (reloc_type == BFD_RELOC_RELC)
+ {
+ /* Change addend to "self-describing" form,
+ for BFD to handle in the linker. */
+ value = gas_cgen_encode_addend (start, operand->length,
+ length, fixP->fx_size,
+ cd->insn_chunk_bitsize / 8,
+ signed_p,
+ ! (fixP->fx_cgen.msb_field_p));
+ }
+#endif
if (reloc_type != BFD_RELOC_NONE)
fixP->fx_r_type = reloc_type;
fixP->fx_addnumber = value;
}
+bfd_reloc_code_real_type
+gas_cgen_pcrel_r_type (bfd_reloc_code_real_type r)
+{
+ switch (r)
+ {
+ case BFD_RELOC_8: r = BFD_RELOC_8_PCREL; break;
+ case BFD_RELOC_16: r = BFD_RELOC_16_PCREL; break;
+ case BFD_RELOC_24: r = BFD_RELOC_24_PCREL; break;
+ case BFD_RELOC_32: r = BFD_RELOC_32_PCREL; break;
+ case BFD_RELOC_64: r = BFD_RELOC_64_PCREL; break;
+ default:
+ break;
+ }
+ return r;
+}
+
/* Translate internal representation of relocation info to BFD target format.
FIXME: To what extent can we get all relevant targets to use this? */
arelent *
-gas_cgen_tc_gen_reloc (section, fixP)
- asection * section ATTRIBUTE_UNUSED;
- fixS * fixP;
+gas_cgen_tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP)
{
+ bfd_reloc_code_real_type r_type = fixP->fx_r_type;
arelent *reloc;
- reloc = (arelent *) xmalloc (sizeof (arelent));
+ reloc = XNEW (arelent);
+
+#ifdef GAS_CGEN_PCREL_R_TYPE
+ if (fixP->fx_pcrel)
+ r_type = GAS_CGEN_PCREL_R_TYPE (r_type);
+#endif
+ reloc->howto = bfd_reloc_type_lookup (stdoutput, r_type);
- reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type);
if (reloc->howto == (reloc_howto_type *) NULL)
{
as_bad_where (fixP->fx_file, fixP->fx_line,
return NULL;
}
- assert (!fixP->fx_pcrel == !reloc->howto->pc_relative);
+ gas_assert (!fixP->fx_pcrel == !reloc->howto->pc_relative);
- reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
+ reloc->sym_ptr_ptr = XNEW (asymbol *);
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy);
/* Use fx_offset for these cases. */
Called after gas_cgen_cpu_desc has been created. */
void
-gas_cgen_begin ()
+gas_cgen_begin (void)
{
if (flag_signed_overflow_ok)
cgen_set_signed_overflow_ok (gas_cgen_cpu_desc);
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