/* GAS interface for targets using CGEN: Cpu tools GENerator.
- Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1996-2020 Free Software Foundation, Inc.
-This file is part of GAS, the GNU Assembler.
+ 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)
-any later version.
+ 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 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 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. */
symbol_table_insert (symbol_create (name, reg_section,
- number, & zero_address_frag));
+ number, &zero_address_frag));
}
/* We need to keep a list of fixups. We can't simply generate them as
int opindex;
int opinfo;
expressionS exp;
+ struct cgen_maybe_multi_ifield * field;
+ int msb_field_p;
};
-static struct fixup fixups [GAS_CGEN_MAX_FIXUPS];
+static struct fixup fixups[GAS_CGEN_MAX_FIXUPS];
static int num_fixups;
/* Prepare to parse an instruction.
??? 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;
- 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)
as_fatal (_("too many fixups"));
- fixups[num_fixups].exp = * expP;
+ fixups[num_fixups].exp = *expP;
fixups[num_fixups].opindex = opindex;
fixups[num_fixups].opinfo = opinfo;
++ num_fixups;
}
-/* The following three functions allow a backup of the fixup chain to be made,
- and to have this backup be swapped with the current chain. This allows
- certain ports, eg the m32r, to swap two instructions and swap their fixups
- at the same time. */
-/* ??? I think with cgen_asm_finish_insn (or something else) there is no
- more need for this. */
+/* The following functions allow fixup chains to be stored, retrieved,
+ and swapped. They are a generalization of a pre-existing scheme
+ for storing, restoring and swapping fixup chains that was used by
+ the m32r port. The functionality is essentially the same, only
+ instead of only being able to store a single fixup chain, an entire
+ array of fixup chains can be stored. It is the user's responsibility
+ to keep track of how many fixup chains have been stored and which
+ elements of the array they are in.
+
+ The algorithms used are the same as in the old scheme. Other than the
+ "array-ness" of the whole thing, the functionality is identical to the
+ old scheme.
+
+ gas_cgen_initialize_saved_fixups_array():
+ Sets num_fixups_in_chain to 0 for each element. Call this from
+ md_begin() if you plan to use these functions and you want the
+ fixup count in each element to be set to 0 initially. This is
+ not necessary, but it's included just in case. It performs
+ the same function for each element in the array of fixup chains
+ that gas_init_parse() performs for the current fixups.
+
+ gas_cgen_save_fixups (element):
+ element - element number of the array you wish to store the fixups
+ to. No mechanism is built in for tracking what element
+ was last stored to.
+
+ gas_cgen_restore_fixups (element):
+ element - element number of the array you wish to restore the fixups
+ from.
+
+ gas_cgen_swap_fixups(int element):
+ element - swap the current fixups with those in this element number.
+*/
+
+struct saved_fixups
+{
+ struct fixup fixup_chain[GAS_CGEN_MAX_FIXUPS];
+ int num_fixups_in_chain;
+};
-static struct fixup saved_fixups [GAS_CGEN_MAX_FIXUPS];
-static int saved_num_fixups;
+static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS];
void
-gas_cgen_save_fixups ()
+gas_cgen_initialize_saved_fixups_array (void)
{
- saved_num_fixups = num_fixups;
-
- memcpy (saved_fixups, fixups, sizeof (fixups[0]) * num_fixups);
+ int i = 0;
- num_fixups = 0;
+ while (i < MAX_SAVED_FIXUP_CHAINS)
+ stored_fixups[i++].num_fixups_in_chain = 0;
}
void
-gas_cgen_restore_fixups ()
+gas_cgen_save_fixups (int i)
{
- num_fixups = saved_num_fixups;
-
- memcpy (fixups, saved_fixups, sizeof (fixups[0]) * num_fixups);
+ if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
+ {
+ as_fatal ("index into stored_fixups[] out of bounds");
+ return;
+ }
- saved_num_fixups = 0;
+ stored_fixups[i].num_fixups_in_chain = num_fixups;
+ memcpy (stored_fixups[i].fixup_chain, fixups,
+ sizeof (fixups[0]) * num_fixups);
+ num_fixups = 0;
}
void
-gas_cgen_swap_fixups ()
+gas_cgen_restore_fixups (int i)
{
- int tmp;
- struct fixup tmp_fixup;
-
- if (num_fixups == 0)
+ if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
{
- gas_cgen_restore_fixups ();
+ as_fatal ("index into stored_fixups[] out of bounds");
+ return;
}
- else if (saved_num_fixups == 0)
+
+ num_fixups = stored_fixups[i].num_fixups_in_chain;
+ memcpy (fixups, stored_fixups[i].fixup_chain,
+ (sizeof (stored_fixups[i].fixup_chain[0])) * num_fixups);
+ stored_fixups[i].num_fixups_in_chain = 0;
+}
+
+void
+gas_cgen_swap_fixups (int i)
+{
+ if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
{
- gas_cgen_save_fixups ();
+ as_fatal ("index into stored_fixups[] out of bounds");
+ return;
}
+
+ if (num_fixups == 0)
+ gas_cgen_restore_fixups (i);
+
+ else if (stored_fixups[i].num_fixups_in_chain == 0)
+ gas_cgen_save_fixups (i);
+
else
{
- tmp = saved_num_fixups;
- saved_num_fixups = num_fixups;
+ int tmp;
+ struct fixup tmp_fixup;
+
+ tmp = stored_fixups[i].num_fixups_in_chain;
+ stored_fixups[i].num_fixups_in_chain = num_fixups;
num_fixups = tmp;
-
+
for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;)
{
- tmp_fixup = saved_fixups [tmp];
- saved_fixups [tmp] = fixups [tmp];
- fixups [tmp] = tmp_fixup;
+ tmp_fixup = stored_fixups[i].fixup_chain [tmp];
+ stored_fixups[i].fixup_chain[tmp] = fixups [tmp];
+ fixups [tmp] = tmp_fixup;
}
}
}
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;
+ fixS *fixP;
/* It may seem strange to use operand->attrs and not insn->attrs here,
but it is the operand that has a pc relative relocation. */
-
fixP = fix_new (frag, where, length / 8, symbol, offset,
CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR),
(bfd_reloc_code_real_type)
+ (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;
}
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;
+ fixS *fixP;
/* It may seem strange to use operand->attrs and not insn->attrs here,
but it is the operand that has a pc relative relocation. */
-
fixP = fix_new_exp (frag, where, length / 8, exp,
CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR),
(bfd_reloc_code_real_type)
+ (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;
- 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. */
char * volatile hold;
enum cgen_parse_operand_result * volatile resultP_1;
+ volatile int opinfo_1;
#else
- static char * hold;
- static enum cgen_parse_operand_result * resultP_1;
+ static char *hold;
+ static enum cgen_parse_operand_result *resultP_1;
+ int opinfo_1;
#endif
- const char * errmsg = NULL;
+ 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 ();
resultP_1 = resultP;
hold = input_line_pointer;
- input_line_pointer = (char *) * strP;
+ input_line_pointer = (char *) *strP;
+ opinfo_1 = opinfo;
/* We rely on md_operand to longjmp back to us.
This is done via gas_cgen_md_operand. */
{
expr_jmp_buf_p = 0;
input_line_pointer = (char *) hold;
- * resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR;
- return "illegal operand";
+ *resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR;
+ return _("illegal operand");
}
expr_jmp_buf_p = 1;
- expression (& exp);
+ expression (&exp);
expr_jmp_buf_p = 0;
+ errmsg = NULL;
- * strP = input_line_pointer;
+ *strP = input_line_pointer;
input_line_pointer = hold;
+#ifdef TC_CGEN_PARSE_FIX_EXP
+ opinfo_1 = TC_CGEN_PARSE_FIX_EXP (opinfo_1, & exp);
+#endif
+
/* FIXME: Need to check `want'. */
switch (exp.X_op)
{
- case O_illegal :
+ case O_illegal:
errmsg = _("illegal operand");
- * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR;
+ *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR;
break;
- case O_absent :
+ case O_absent:
errmsg = _("missing operand");
- * resultP = CGEN_PARSE_OPERAND_RESULT_ERROR;
+ *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR;
break;
- case O_constant :
- * valueP = exp.X_add_number;
- * resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER;
+ case O_constant:
+ if (want == CGEN_PARSE_OPERAND_SYMBOLIC)
+ goto de_fault;
+ *valueP = exp.X_add_number;
+ *resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER;
break;
- case O_register :
- * valueP = exp.X_add_number;
- * resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER;
+ case O_register:
+ *valueP = exp.X_add_number;
+ *resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER;
break;
- default :
- queue_fixup (opindex, opinfo, & exp);
- * valueP = 0;
- * resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED;
+ 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;
+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;
- char * f;
+ char *f;
unsigned int byte_len = length / 8;
/* ??? Target foo issues various warnings here, so one might want to provide
Relaxable instructions: We need to ensure we allocate enough
space for the largest insn. */
- if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX))
- abort (); /* These currently shouldn't get here. */
+ if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
+ /* These currently shouldn't get here. */
+ abort ();
/* Is there a relaxable insn with the relaxable operand needing a fixup? */
/* Scan the fixups for the operand affected by relaxing
(i.e. the branch address). */
- for (i = 0; i < num_fixups; ++ i)
+ for (i = 0; i < num_fixups; ++i)
{
if (CGEN_OPERAND_ATTR_VALUE (cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex),
CGEN_OPERAND_RELAX))
if (relax_operand != -1)
{
int max_len;
- fragS * old_frag;
+ fragS *old_frag;
+ expressionS *exp;
+ symbolS *sym;
+ offsetT off;
#ifdef TC_CGEN_MAX_RELAX
max_len = TC_CGEN_MAX_RELAX (insn, byte_len);
/* Create a relaxable fragment for this instruction. */
old_frag = frag_now;
+ exp = &fixups[relax_operand].exp;
+ sym = exp->X_add_symbol;
+ off = exp->X_add_number;
+ if (exp->X_op != O_constant && exp->X_op != O_symbol)
+ {
+ /* Handle complex expressions. */
+ sym = make_expr_symbol (exp);
+ off = 0;
+ }
+
frag_var (rs_machine_dependent,
max_len - byte_len /* max chars */,
0 /* variable part already allocated */,
/* FIXME: When we machine generate the relax table,
machine generate a macro to compute subtype. */
1 /* subtype */,
- fixups[relax_operand].exp.X_add_symbol,
- fixups[relax_operand].exp.X_add_number,
+ sym,
+ off,
f);
/* Record the operand number with the fragment so md_convert_frag
/* If we're recording insns as numbers (rather than a string of bytes),
target byte order handling is deferred until now. */
#if CGEN_INT_INSN_P
- cgen_put_insn_value (gas_cgen_cpu_desc, f, length, *buf);
+ cgen_put_insn_value (gas_cgen_cpu_desc, (unsigned char *) f, length, *buf);
#else
memcpy (f, buf, byte_len);
#endif
+ /* Emit DWARF2 debugging information. */
+ dwarf2_emit_insn (byte_len);
+
/* Create any fixups. */
for (i = 0; i < num_fixups; ++i)
{
cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex);
/* Don't create fixups for these. That's done during relaxation.
- We don't need to test for CGEN_INSN_RELAX as they can't get here
+ We don't need to test for CGEN_INSN_RELAXED as they can't get here
(see above). */
if (relax_p
&& CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE)
#define md_cgen_record_fixup_exp gas_cgen_record_fixup_exp
#endif
- fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal,
- insn, length, operand,
- fixups[i].opinfo,
- & fixups[i].exp);
- if (result)
- result->fixups[i] = fixP;
+ fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal,
+ 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;
}
if (result)
}
}
+#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
handles the rest. bfd_install_relocation (or some other bfd function)
should handle them all. */
-int
-gas_cgen_md_apply_fix3 (fixP, valueP, seg)
- fixS * fixP;
- valueT * valueP;
- segT seg;
+void
+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;
- /* canonical name, since used a lot */
+ char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
+ valueT value = * valP;
+ /* Canonical name, since used a lot. */
CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
-
- /* FIXME FIXME FIXME: The value we are passed in *valuep includes
- the symbol values. Since we are using BFD_ASSEMBLER, if we are
- doing this relocation the code in write.c is going to call
- bfd_install_relocation, which is also going to use the symbol
- value. That means that if the reloc is fully resolved we want to
- use *valuep since bfd_install_relocation is not being used.
- However, if the reloc is not fully resolved we do not want to use
- *valuep, and must use fx_offset instead. However, if the reloc
- is PC relative, we do want to use *valuep since it includes the
- result of md_pcrel_from. This is confusing. */
if (fixP->fx_addsy == (symbolS *) NULL)
- {
- value = * valueP;
- fixP->fx_done = 1;
- }
- else if (fixP->fx_pcrel)
- value = * valueP;
- else
- {
- value = fixP->fx_offset;
- if (fixP->fx_subsy != (symbolS *) NULL)
- {
- if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section)
- value -= S_GET_VALUE (fixP->fx_subsy);
- else
- {
- /* We don't actually support subtracting a symbol. */
- as_bad_where (fixP->fx_file, fixP->fx_line,
- _("expression too complex"));
- }
- }
- }
+ fixP->fx_done = 1;
+
+ /* We don't actually support subtracting a symbol. */
+ if (fixP->fx_subsy != (symbolS *) NULL)
+ as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex"));
if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
{
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);
#if CGEN_INT_INSN_P
{
CGEN_INSN_INT insn_value =
- cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn));
+ cgen_get_insn_value (cd, (unsigned char *) where,
+ CGEN_INSN_BITSIZE (insn));
- /* ??? 0 is passed for `pc' */
+ /* ??? 0 is passed for `pc'. */
errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields,
&insn_value, (bfd_vma) 0);
- cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn),
- insn_value);
+ cgen_put_insn_value (cd, (unsigned char *) where,
+ CGEN_INSN_BITSIZE (insn), insn_value);
}
#else
- /* ??? 0 is passed for `pc' */
- errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where,
- (bfd_vma) 0);
+ /* ??? 0 is passed for `pc'. */
+ errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields,
+ (unsigned char *) where,
+ (bfd_vma) 0);
#endif
if (errmsg)
as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg);
+
+ free (fields);
}
if (fixP->fx_done)
- return 1;
+ return;
/* The operand isn't fully resolved. Determine a BFD reloc value
based on the operand information and leave it to
partial_inplace == false. */
reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
- if (reloc_type != BFD_RELOC_NONE)
+#ifdef OBJ_COMPLEX_RELC
+ if (reloc_type == BFD_RELOC_RELC)
{
- fixP->fx_r_type = reloc_type;
+ /* 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;
else
{
as_bad_where (fixP->fx_file, fixP->fx_line,
_("unresolved expression that must be resolved"));
fixP->fx_done = 1;
- return 1;
+ return;
}
}
else if (fixP->fx_done)
case BFD_RELOC_32:
md_number_to_chars (where, value, 4);
break;
- /* FIXME: later add support for 64 bits. */
+ case BFD_RELOC_64:
+ md_number_to_chars (where, value, 8);
+ break;
default:
as_bad_where (fixP->fx_file, fixP->fx_line,
_("internal error: can't install fix for reloc type %d (`%s')"),
break;
}
}
- else
- {
- /* bfd_install_relocation will be called to finish things up. */
- }
+ /* else
+ bfd_install_relocation will be called to finish things up. */
/* Tuck `value' away for use by tc_gen_reloc.
See the comment describing fx_addnumber in write.h.
This field is misnamed (or misused :-). */
fixP->fx_addnumber = value;
+}
- return 1;
+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;
- fixS * fixP;
+gas_cgen_tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP)
{
- arelent * reloc;
+ bfd_reloc_code_real_type r_type = fixP->fx_r_type;
+ arelent *reloc;
+
+ reloc = XNEW (arelent);
- reloc = (arelent *) xmalloc (sizeof (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,
- _("internal error: can't export reloc type %d (`%s')"),
- fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type));
+ _("relocation is not supported"));
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 */
- if ( fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY
+ /* Use fx_offset for these cases. */
+ if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY
|| fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT)
- reloc->addend = fixP->fx_offset;
+ reloc->addend = fixP->fx_offset;
else
- reloc->addend = fixP->fx_addnumber;
+ reloc->addend = fixP->fx_addnumber;
reloc->address = fixP->fx_frag->fr_address + fixP->fx_where;
return reloc;
}
+
+/* Perform any cgen specific initialisation.
+ Called after gas_cgen_cpu_desc has been created. */
+
+void
+gas_cgen_begin (void)
+{
+ if (flag_signed_overflow_ok)
+ cgen_set_signed_overflow_ok (gas_cgen_cpu_desc);
+ else
+ cgen_clear_signed_overflow_ok (gas_cgen_cpu_desc);
+}
projects / deliverable / binutils-gdb.git / blobdiff