/* Instruction printing code for the ARC.
- Copyright (C) 1994, 1995, 1997, 1998 Free Software Foundation, Inc.
- Contributed by Doug Evans (dje@cygnus.com).
+ Copyright (C) 1994-2016 Free Software Foundation, Inc.
-This program 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 of the License, or
-(at your option) any later version.
+ Contributed by Claudiu Zissulescu (claziss@synopsys.com)
-This program 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.
+ This file is part of libopcodes.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ This library 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.
+ It 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 this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
+
+#include "sysdep.h"
+#include <stdio.h>
+#include <assert.h>
#include "dis-asm.h"
#include "opcode/arc.h"
-#include "elf-bfd.h"
#include "elf/arc.h"
+#include "arc-dis.h"
+#include "arc-ext.h"
+#include "elf-bfd.h"
+#include "libiberty.h"
#include "opintl.h"
-static int print_insn_arc_base_little PARAMS ((bfd_vma, disassemble_info *));
-static int print_insn_arc_base_big PARAMS ((bfd_vma, disassemble_info *));
+/* Structure used to iterate over, and extract the values for, operands of
+ an opcode. */
-static int print_insn PARAMS ((bfd_vma, disassemble_info *, int, int));
+struct arc_operand_iterator
+{
+ enum
+ {
+ OPERAND_ITERATOR_STANDARD,
+ OPERAND_ITERATOR_LONG
+ } mode;
-/* Print one instruction from PC on INFO->STREAM.
- Return the size of the instruction (4 or 8 for the ARC). */
+ /* The array of 32-bit values that make up this instruction. All
+ required values have been pre-loaded into this array during the
+ find_format call. */
+ unsigned *insn;
-static int
-print_insn (pc, info, mach, big_p)
- bfd_vma pc;
- disassemble_info *info;
- int mach;
- int big_p;
+ union
+ {
+ struct
+ {
+ /* The opcode this iterator is operating on. */
+ const struct arc_opcode *opcode;
+
+ /* The index into the opcodes operand index list. */
+ const unsigned char *opidx;
+ } standard;
+
+ struct
+ {
+ /* The long instruction opcode this iterator is operating on. */
+ const struct arc_long_opcode *long_opcode;
+
+ /* Two indexes into the opcodes operand index lists. */
+ const unsigned char *opidx_base, *opidx_limm;
+ } long_insn;
+ } state;
+};
+
+/* Globals variables. */
+
+static const char * const regnames[64] =
{
- const struct arc_opcode *opcode;
- bfd_byte buffer[4];
- void *stream = info->stream;
- fprintf_ftype func = info->fprintf_func;
- int status;
- /* First element is insn, second element is limm (if present). */
- arc_insn insn[2];
- int got_limm_p = 0;
- static int initialized = 0;
- static int current_mach = 0;
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+ "r24", "r25", "gp", "fp", "sp", "ilink", "r30", "blink",
+
+ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
+ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
+ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55",
+ "r56", "r57", "ACCL", "ACCH", "lp_count", "rezerved", "LIMM", "pcl"
+};
+
+/* This structure keeps track which instruction class(es)
+ should be ignored durring disassembling. */
+
+typedef struct skipclass
+{
+ insn_class_t insn_class;
+ insn_subclass_t subclass;
+ struct skipclass *nxt;
+} skipclass_t, *linkclass;
+
+/* Intial classes of instructions to be consider first when
+ disassembling. */
+static linkclass decodelist = NULL;
- if (!initialized || mach != current_mach)
+/* Macros section. */
+
+#ifdef DEBUG
+# define pr_debug(fmt, args...) fprintf (stderr, fmt, ##args)
+#else
+# define pr_debug(fmt, args...)
+#endif
+
+#define ARRANGE_ENDIAN(info, buf) \
+ (info->endian == BFD_ENDIAN_LITTLE ? bfd_getm32 (bfd_getl32 (buf)) \
+ : bfd_getb32 (buf))
+
+#define BITS(word,s,e) (((word) << (sizeof (word) * 8 - 1 - e)) >> \
+ (s + (sizeof (word) * 8 - 1 - e)))
+#define OPCODE(word) (BITS ((word), 27, 31))
+
+#define OPCODE_AC(word) (BITS ((word), 11, 15))
+
+/* Functions implementation. */
+
+/* Return TRUE when two classes are not opcode conflicting. */
+
+static bfd_boolean
+is_compatible_p (insn_class_t classA,
+ insn_subclass_t sclassA,
+ insn_class_t classB,
+ insn_subclass_t sclassB)
+{
+ if (classA == DSP && sclassB == DPX)
+ return FALSE;
+ if (sclassA == DPX && classB == DSP)
+ return FALSE;
+ return TRUE;
+}
+
+/* Add a new element to the decode list. */
+
+static void
+add_to_decodelist (insn_class_t insn_class,
+ insn_subclass_t subclass)
+{
+ linkclass t = (linkclass) xmalloc (sizeof (skipclass_t));
+
+ t->insn_class = insn_class;
+ t->subclass = subclass;
+ t->nxt = decodelist;
+ decodelist = t;
+}
+
+/* Return TRUE if we need to skip the opcode from being
+ disassembled. */
+
+static bfd_boolean
+skip_this_opcode (const struct arc_opcode * opcode,
+ struct disassemble_info * info)
+{
+ linkclass t = decodelist;
+ bfd_boolean addme = TRUE;
+
+ /* Check opcode for major 0x06, return if it is not in. */
+ if (OPCODE (opcode->opcode) != 0x06)
+ return FALSE;
+
+ while (t != NULL
+ && is_compatible_p (t->insn_class, t->subclass,
+ opcode->insn_class, opcode->subclass))
{
- initialized = 1;
- current_mach = arc_get_opcode_mach (mach, big_p);
- arc_opcode_init_tables (current_mach);
+ if ((t->insn_class == opcode->insn_class)
+ && (t->subclass == opcode->subclass))
+ addme = FALSE;
+ t = t->nxt;
}
- status = (*info->read_memory_func) (pc, buffer, 4, info);
- if (status != 0)
+ /* If we found an incompatibility then we must skip. */
+ if (t != NULL)
+ return TRUE;
+
+ /* Even if we do not precisely know the if the right mnemonics
+ is correctly displayed, keep the disassmbled code class
+ consistent. */
+ if (addme)
{
- (*info->memory_error_func) (status, pc, info);
- return -1;
+ switch (opcode->insn_class)
+ {
+ case DSP:
+ case FLOAT:
+ /* Add to the conflict list only the classes which
+ counts. */
+ add_to_decodelist (opcode->insn_class, opcode->subclass);
+ /* Warn if we have to decode an opcode and no preferred
+ classes have been chosen. */
+ info->fprintf_func (info->stream, _("\n\
+Warning: disassembly may be wrong due to guessed opcode class choice.\n\
+ Use -M<class[,class]> to select the correct opcode class(es).\n\t\t\t\t"));
+ break;
+ default:
+ break;
+ }
}
- if (big_p)
- insn[0] = bfd_getb32 (buffer);
- else
- insn[0] = bfd_getl32 (buffer);
+ return FALSE;
+}
- (*func) (stream, "%08lx\t", insn[0]);
+static bfd_vma
+bfd_getm32 (unsigned int data)
+{
+ bfd_vma value = 0;
- /* The instructions are stored in lists hashed by the insn code
- (though we needn't care how they're hashed). */
+ value = ((data & 0xff00) | (data & 0xff)) << 16;
+ value |= ((data & 0xff0000) | (data & 0xff000000)) >> 16;
+ return value;
+}
- opcode = arc_opcode_lookup_dis (insn[0]);
- for ( ; opcode != NULL; opcode = ARC_OPCODE_NEXT_DIS (opcode))
+static bfd_boolean
+special_flag_p (const char *opname,
+ const char *flgname)
+{
+ const struct arc_flag_special *flg_spec;
+ unsigned i, j, flgidx;
+
+ for (i = 0; i < arc_num_flag_special; i++)
{
- char *syn;
- int mods,invalid;
- long value;
- const struct arc_operand *operand;
- const struct arc_operand_value *opval;
-
- /* Basic bit mask must be correct. */
- if ((insn[0] & opcode->mask) != opcode->value)
+ flg_spec = &arc_flag_special_cases[i];
+
+ if (strcmp (opname, flg_spec->name))
continue;
- /* Supported by this cpu? */
- if (! arc_opcode_supported (opcode))
+ /* Found potential special case instruction. */
+ for (j=0;; ++j)
+ {
+ flgidx = flg_spec->flags[j];
+ if (flgidx == 0)
+ break; /* End of the array. */
+
+ if (strcmp (flgname, arc_flag_operands[flgidx].name) == 0)
+ return TRUE;
+ }
+ }
+ return FALSE;
+}
+
+/* Find opcode from ARC_TABLE given the instruction described by INSN and
+ INSNLEN. The ISA_MASK restricts the possible matches in ARC_TABLE. */
+
+static const struct arc_opcode *
+find_format_from_table (struct disassemble_info *info,
+ const struct arc_opcode *arc_table,
+ unsigned *insn,
+ unsigned int insn_len,
+ unsigned isa_mask,
+ bfd_boolean *has_limm,
+ bfd_boolean overlaps)
+{
+ unsigned int i = 0;
+ const struct arc_opcode *opcode = NULL;
+ const unsigned char *opidx;
+ const unsigned char *flgidx;
+
+ do
+ {
+ bfd_boolean invalid = FALSE;
+
+ opcode = &arc_table[i++];
+
+ if (ARC_SHORT (opcode->mask) && (insn_len == 2))
+ {
+ if (OPCODE_AC (opcode->opcode) != OPCODE_AC (insn[0]))
+ continue;
+ }
+ else if (!ARC_SHORT (opcode->mask) && (insn_len == 4))
+ {
+ if (OPCODE (opcode->opcode) != OPCODE (insn[0]))
+ continue;
+ }
+ else
continue;
- /* Make two passes over the operands. First see if any of them
- have extraction functions, and, if they do, make sure the
- instruction is valid. */
+ if ((insn[0] ^ opcode->opcode) & opcode->mask)
+ continue;
- arc_opcode_init_extract ();
- invalid = 0;
+ if (!(opcode->cpu & isa_mask))
+ continue;
- /* ??? Granted, this is slower than the `ppc' way. Maybe when this is
- done it'll be clear what the right way to do this is. */
- /* Instructions like "add.f r0,r1,1" are tricky because the ".f" gets
- printed first, but we don't know how to print it until we've processed
- the regs. Since we're scanning all the args before printing the insn
- anyways, it's actually quite easy. */
+ *has_limm = FALSE;
- for (syn = opcode->syntax; *syn; ++syn)
+ /* Possible candidate, check the operands. */
+ for (opidx = opcode->operands; *opidx; opidx++)
{
- int c;
+ int value;
+ const struct arc_operand *operand = &arc_operands[*opidx];
- if (*syn != '%' || *++syn == '%')
+ if (operand->flags & ARC_OPERAND_FAKE)
continue;
- mods = 0;
- c = *syn;
- while (ARC_MOD_P (arc_operands[arc_operand_map[c]].flags))
+
+ if (operand->extract)
+ value = (*operand->extract) (insn[0], &invalid);
+ else
+ value = (insn[0] >> operand->shift) & ((1 << operand->bits) - 1);
+
+ /* Check for LIMM indicator. If it is there, then make sure
+ we pick the right format. */
+ if (operand->flags & ARC_OPERAND_IR
+ && !(operand->flags & ARC_OPERAND_LIMM))
{
- mods |= arc_operands[arc_operand_map[c]].flags & ARC_MOD_BITS;
- ++syn;
- c = *syn;
+ if ((value == 0x3E && insn_len == 4)
+ || (value == 0x1E && insn_len == 2))
+ {
+ invalid = TRUE;
+ break;
+ }
+ }
+
+ if (operand->flags & ARC_OPERAND_LIMM
+ && !(operand->flags & ARC_OPERAND_DUPLICATE))
+ *has_limm = TRUE;
+ }
+
+ /* Check the flags. */
+ for (flgidx = opcode->flags; *flgidx; flgidx++)
+ {
+ /* Get a valid flag class. */
+ const struct arc_flag_class *cl_flags = &arc_flag_classes[*flgidx];
+ const unsigned *flgopridx;
+ int foundA = 0, foundB = 0;
+ unsigned int value;
+
+ /* Check first the extensions. */
+ if (cl_flags->flag_class & F_CLASS_EXTEND)
+ {
+ value = (insn[0] & 0x1F);
+ if (arcExtMap_condCodeName (value))
+ continue;
+ }
+
+ for (flgopridx = cl_flags->flags; *flgopridx; ++flgopridx)
+ {
+ const struct arc_flag_operand *flg_operand =
+ &arc_flag_operands[*flgopridx];
+
+ value = (insn[0] >> flg_operand->shift)
+ & ((1 << flg_operand->bits) - 1);
+ if (value == flg_operand->code)
+ foundA = 1;
+ if (value)
+ foundB = 1;
+ }
+
+ if (!foundA && foundB)
+ {
+ invalid = TRUE;
+ break;
}
- operand = arc_operands + arc_operand_map[c];
- if (operand->extract)
- (*operand->extract) (insn, operand, mods,
- (const struct arc_operand_value **) NULL,
- &invalid);
}
+
if (invalid)
continue;
+ if (insn_len == 4
+ && overlaps
+ && skip_this_opcode (opcode, info))
+ continue;
+
/* The instruction is valid. */
+ return opcode;
+ }
+ while (opcode->mask);
+
+ return NULL;
+}
+
+/* Find long instructions matching values in INSN array. */
+
+static const struct arc_long_opcode *
+find_format_long_instructions (unsigned *insn,
+ unsigned int *insn_len,
+ unsigned isa_mask,
+ bfd_vma memaddr,
+ struct disassemble_info *info)
+{
+ unsigned int i;
+ unsigned limm = 0;
+ bfd_boolean limm_loaded = FALSE;
+
+ for (i = 0; i < arc_num_long_opcodes; ++i)
+ {
+ bfd_byte buffer[4];
+ int status;
+ const struct arc_opcode *opcode;
+
+ opcode = &arc_long_opcodes[i].base_opcode;
+
+ if (ARC_SHORT (opcode->mask) && (*insn_len == 2))
+ {
+ if (OPCODE_AC (opcode->opcode) != OPCODE_AC (insn[0]))
+ continue;
+ }
+ else if (!ARC_SHORT (opcode->mask) && (*insn_len == 4))
+ {
+ if (OPCODE (opcode->opcode) != OPCODE (insn[0]))
+ continue;
+ }
+ else
+ continue;
+
+ if ((insn[0] ^ opcode->opcode) & opcode->mask)
+ continue;
+
+ if (!(opcode->cpu & isa_mask))
+ continue;
+
+ if (!limm_loaded)
+ {
+ status = (*info->read_memory_func) (memaddr + *insn_len, buffer,
+ 4, info);
+ if (status != 0)
+ return NULL;
- /* If we have an insn with a limm, fetch it now. Scanning the insns
- twice lets us do this. */
- if (arc_opcode_limm_p (NULL))
+ limm = ARRANGE_ENDIAN (info, buffer);
+ limm_loaded = TRUE;
+ }
+
+ /* Check the second word using the mask and template. */
+ if ((limm & arc_long_opcodes[i].limm_mask)
+ != arc_long_opcodes[i].limm_template)
+ continue;
+
+ (*insn_len) += 4;
+ insn[1] = limm;
+ return &arc_long_opcodes[i];
+ }
+
+ return NULL;
+}
+
+/* Find opcode for INSN, trying various different sources. The instruction
+ length in INSN_LEN will be updated if the instruction requires a LIMM
+ extension, and the additional values loaded into the INSN array (which
+ must be big enough).
+
+ A pointer to the opcode is placed into OPCODE_RESULT, and ITER is
+ initialised, ready to iterate over the operands of the found opcode.
+
+ This function returns TRUE in almost all cases, FALSE is reserved to
+ indicate an error (failing to find an opcode is not an error) a
+ returned result of FALSE would indicate that the disassembler can't
+ continue.
+
+ If no matching opcode is found then the returned result will be TRUE,
+ the value placed into OPCODE_RESULT will be NULL, ITER will be
+ undefined, and INSN_LEN will be unchanged.
+
+ If a matching opcode is found, then the returned result will be TRUE,
+ the opcode pointer is placed into OPCODE_RESULT, INSN_LEN will be
+ increased by 4 if the instruction requires a LIMM, and the LIMM value
+ will have been loaded into the INSN[1]. Finally, ITER will have been
+ initialised so that calls to OPERAND_ITERATOR_NEXT will iterate over
+ the opcode's operands. */
+
+static bfd_boolean
+find_format (bfd_vma memaddr,
+ unsigned * insn,
+ unsigned int * insn_len,
+ unsigned isa_mask,
+ struct disassemble_info * info,
+ const struct arc_opcode ** opcode_result,
+ struct arc_operand_iterator * iter)
+{
+ const struct arc_opcode *opcode = NULL;
+ bfd_boolean needs_limm;
+ const extInstruction_t *einsn;
+
+ /* First, try the extension instructions. */
+ einsn = arcExtMap_insn (OPCODE (insn[0]), insn[0]);
+ if (einsn != NULL)
+ {
+ const char *errmsg = NULL;
+
+ opcode = arcExtMap_genOpcode (einsn, isa_mask, &errmsg);
+ if (opcode == NULL)
{
- status = (*info->read_memory_func) (pc + 4, buffer, 4, info);
- if (status != 0)
- {
- (*info->memory_error_func) (status, pc, info);
- return -1;
- }
- if (big_p)
- insn[1] = bfd_getb32 (buffer);
- else
- insn[1] = bfd_getl32 (buffer);
- got_limm_p = 1;
+ (*info->fprintf_func) (info->stream, "\
+An error occured while generating the extension instruction operations");
+ *opcode_result = NULL;
+ return FALSE;
}
- for (syn = opcode->syntax; *syn; ++syn)
+ opcode = find_format_from_table (info, opcode, insn, *insn_len,
+ isa_mask, &needs_limm, FALSE);
+ }
+
+ /* Then, try finding the first match in the opcode table. */
+ if (opcode == NULL)
+ opcode = find_format_from_table (info, arc_opcodes, insn, *insn_len,
+ isa_mask, &needs_limm, TRUE);
+
+ if (needs_limm && opcode != NULL)
+ {
+ bfd_byte buffer[4];
+ int status;
+
+ status = (*info->read_memory_func) (memaddr + *insn_len, buffer,
+ 4, info);
+ if (status != 0)
+ {
+ opcode = NULL;
+ }
+ else
+ {
+ insn[1] = ARRANGE_ENDIAN (info, buffer);
+ *insn_len += 4;
+ }
+ }
+
+ if (opcode == NULL)
+ {
+ const struct arc_long_opcode *long_opcode;
+
+ /* No instruction found yet, try the long instructions. */
+ long_opcode =
+ find_format_long_instructions (insn, insn_len, isa_mask,
+ memaddr, info);
+
+ if (long_opcode != NULL)
+ {
+ iter->mode = OPERAND_ITERATOR_LONG;
+ iter->insn = insn;
+ iter->state.long_insn.long_opcode = long_opcode;
+ iter->state.long_insn.opidx_base =
+ long_opcode->base_opcode.operands;
+ iter->state.long_insn.opidx_limm =
+ long_opcode->operands;
+ opcode = &long_opcode->base_opcode;
+ }
+ }
+ else
+ {
+ iter->mode = OPERAND_ITERATOR_STANDARD;
+ iter->insn = insn;
+ iter->state.standard.opcode = opcode;
+ iter->state.standard.opidx = opcode->operands;
+ }
+
+ *opcode_result = opcode;
+ return TRUE;
+}
+
+static void
+print_flags (const struct arc_opcode *opcode,
+ unsigned *insn,
+ struct disassemble_info *info)
+{
+ const unsigned char *flgidx;
+ unsigned int value;
+
+ /* Now extract and print the flags. */
+ for (flgidx = opcode->flags; *flgidx; flgidx++)
+ {
+ /* Get a valid flag class. */
+ const struct arc_flag_class *cl_flags = &arc_flag_classes[*flgidx];
+ const unsigned *flgopridx;
+
+ /* Check first the extensions. */
+ if (cl_flags->flag_class & F_CLASS_EXTEND)
{
- int c;
+ const char *name;
+ value = (insn[0] & 0x1F);
- if (*syn != '%' || *++syn == '%')
+ name = arcExtMap_condCodeName (value);
+ if (name)
{
- (*func) (stream, "%c", *syn);
+ (*info->fprintf_func) (info->stream, ".%s", name);
continue;
}
+ }
+
+ for (flgopridx = cl_flags->flags; *flgopridx; ++flgopridx)
+ {
+ const struct arc_flag_operand *flg_operand =
+ &arc_flag_operands[*flgopridx];
+
+ if (!flg_operand->favail)
+ continue;
- /* We have an operand. Fetch any special modifiers. */
- mods = 0;
- c = *syn;
- while (ARC_MOD_P (arc_operands[arc_operand_map[c]].flags))
+ value = (insn[0] >> flg_operand->shift)
+ & ((1 << flg_operand->bits) - 1);
+ if (value == flg_operand->code)
{
- mods |= arc_operands[arc_operand_map[c]].flags & ARC_MOD_BITS;
- ++syn;
- c = *syn;
+ /* FIXME!: print correctly nt/t flag. */
+ if (!special_flag_p (opcode->name, flg_operand->name))
+ (*info->fprintf_func) (info->stream, ".");
+ else if (info->insn_type == dis_dref)
+ {
+ switch (flg_operand->name[0])
+ {
+ case 'b':
+ info->data_size = 1;
+ break;
+ case 'h':
+ case 'w':
+ info->data_size = 2;
+ break;
+ default:
+ info->data_size = 4;
+ break;
+ }
+ }
+ if (flg_operand->name[0] == 'd'
+ && flg_operand->name[1] == 0)
+ info->branch_delay_insns = 1;
+
+ /* Check if it is a conditional flag. */
+ if (cl_flags->flag_class & F_CLASS_COND)
+ {
+ if (info->insn_type == dis_jsr)
+ info->insn_type = dis_condjsr;
+ else if (info->insn_type == dis_branch)
+ info->insn_type = dis_condbranch;
+ }
+
+ (*info->fprintf_func) (info->stream, "%s", flg_operand->name);
}
- operand = arc_operands + arc_operand_map[c];
+ }
+ }
+}
- /* Extract the value from the instruction. */
- opval = NULL;
- if (operand->extract)
+static const char *
+get_auxreg (const struct arc_opcode *opcode,
+ int value,
+ unsigned isa_mask)
+{
+ const char *name;
+ unsigned int i;
+ const struct arc_aux_reg *auxr = &arc_aux_regs[0];
+
+ if (opcode->insn_class != AUXREG)
+ return NULL;
+
+ name = arcExtMap_auxRegName (value);
+ if (name)
+ return name;
+
+ for (i = 0; i < arc_num_aux_regs; i++, auxr++)
+ {
+ if (!(auxr->cpu & isa_mask))
+ continue;
+
+ if (auxr->subclass != NONE)
+ return NULL;
+
+ if (auxr->address == value)
+ return auxr->name;
+ }
+ return NULL;
+}
+
+/* Calculate the instruction length for an instruction starting with MSB
+ and LSB, the most and least significant byte. The ISA_MASK is used to
+ filter the instructions considered to only those that are part of the
+ current architecture.
+
+ The instruction lengths are calculated from the ARC_OPCODE table, and
+ cached for later use. */
+
+static unsigned int
+arc_insn_length (bfd_byte msb, bfd_byte lsb, struct disassemble_info *info)
+{
+ bfd_byte major_opcode = msb >> 3;
+
+ switch (info->mach)
+ {
+ case bfd_mach_arc_arc700:
+ /* The nps400 extension set requires this special casing of the
+ instruction length calculation. Right now this is not causing any
+ problems as none of the known extensions overlap in opcode space,
+ but, if they ever do then we might need to start carrying
+ information around in the elf about which extensions are in use. */
+ if (major_opcode == 0xb)
+ {
+ bfd_byte minor_opcode = lsb & 0x1f;
+
+ if (minor_opcode < 4)
+ return 2;
+ }
+ case bfd_mach_arc_arc600:
+ return (major_opcode > 0xb) ? 2 : 4;
+ break;
+
+ case bfd_mach_arc_arcv2:
+ return (major_opcode > 0x7) ? 2 : 4;
+ break;
+
+ default:
+ abort ();
+ }
+}
+
+/* Extract and return the value of OPERAND from the instruction whose value
+ is held in the array INSN. */
+
+static int
+extract_operand_value (const struct arc_operand *operand, unsigned *insn)
+{
+ int value;
+
+ /* Read the limm operand, if required. */
+ if (operand->flags & ARC_OPERAND_LIMM)
+ /* The second part of the instruction value will have been loaded as
+ part of the find_format call made earlier. */
+ value = insn[1];
+ else
+ {
+ if (operand->extract)
+ value = (*operand->extract) (insn[0], (int *) NULL);
+ else
+ {
+ if (operand->flags & ARC_OPERAND_ALIGNED32)
+ {
+ value = (insn[0] >> operand->shift)
+ & ((1 << (operand->bits - 2)) - 1);
+ value = value << 2;
+ }
+ else
+ {
+ value = (insn[0] >> operand->shift) & ((1 << operand->bits) - 1);
+ }
+ if (operand->flags & ARC_OPERAND_SIGNED)
+ {
+ int signbit = 1 << (operand->bits - 1);
+ value = (value ^ signbit) - signbit;
+ }
+ }
+ }
+
+ return value;
+}
+
+/* Find the next operand, and the operands value from ITER. Return TRUE if
+ there is another operand, otherwise return FALSE. If there is an
+ operand returned then the operand is placed into OPERAND, and the value
+ into VALUE. If there is no operand returned then OPERAND and VALUE are
+ unchanged. */
+
+static bfd_boolean
+operand_iterator_next (struct arc_operand_iterator *iter,
+ const struct arc_operand **operand,
+ int *value)
+{
+ if (iter->mode == OPERAND_ITERATOR_STANDARD)
+ {
+ if (*iter->state.standard.opidx == 0)
+ {
+ *operand = NULL;
+ return FALSE;
+ }
+
+ *operand = &arc_operands[*iter->state.standard.opidx];
+ *value = extract_operand_value (*operand, iter->insn);
+ iter->state.standard.opidx++;
+ }
+ else
+ {
+ const struct arc_operand *operand_base, *operand_limm;
+ int value_base, value_limm;
+
+ if (*iter->state.long_insn.opidx_limm == 0)
+ {
+ *operand = NULL;
+ return FALSE;
+ }
+
+ operand_base = &arc_operands[*iter->state.long_insn.opidx_base];
+ operand_limm = &arc_operands[*iter->state.long_insn.opidx_limm];
+
+ if (operand_base->flags & ARC_OPERAND_LIMM)
+ {
+ /* We've reached the end of the operand list. */
+ *operand = NULL;
+ return FALSE;
+ }
+
+ value_base = value_limm = 0;
+ if (!(operand_limm->flags & ARC_OPERAND_IGNORE))
+ {
+ /* This should never happen. If it does then the use of
+ extract_operand_value below will access memory beyond
+ the insn array. */
+ assert ((operand_limm->flags & ARC_OPERAND_LIMM) == 0);
+
+ *operand = operand_limm;
+ value_limm = extract_operand_value (*operand, &iter->insn[1]);
+ }
+
+ if (!(operand_base->flags & ARC_OPERAND_IGNORE))
+ {
+ *operand = operand_base;
+ value_base = extract_operand_value (*operand, iter->insn);
+ }
+
+ /* This is a bit of a fudge. There's no reason why simply ORing
+ together the two values is the right thing to do, however, for all
+ the cases we currently have, it is the right thing, so, for now,
+ I've put off solving the more complex problem. */
+ *value = value_base | value_limm;
+
+ iter->state.long_insn.opidx_base++;
+ iter->state.long_insn.opidx_limm++;
+ }
+ return TRUE;
+}
+
+/* Helper for parsing the options. */
+
+static void
+parse_option (char *option)
+{
+ if (CONST_STRNEQ (option, "dsp"))
+ add_to_decodelist (DSP, NONE);
+
+ else if (CONST_STRNEQ (option, "spfp"))
+ add_to_decodelist (FLOAT, SPX);
+
+ else if (CONST_STRNEQ (option, "dpfp"))
+ add_to_decodelist (FLOAT, DPX);
+
+ else if (CONST_STRNEQ (option, "quarkse_em"))
+ add_to_decodelist (FLOAT, QUARKSE);
+
+ else if (CONST_STRNEQ (option, "fpuda"))
+ add_to_decodelist (FLOAT, DPA);
+
+ else if (CONST_STRNEQ (option, "fpud"))
+ {
+ add_to_decodelist (FLOAT, SP);
+ add_to_decodelist (FLOAT, CVT);
+ }
+
+ else if (CONST_STRNEQ (option, "fpus"))
+ {
+ add_to_decodelist (FLOAT, DP);
+ add_to_decodelist (FLOAT, CVT);
+ }
+ else
+ fprintf (stderr, _("Unrecognised disassembler option: %s\n"), option);
+}
+
+/* Go over the options list and parse it. */
+
+static void
+parse_disassembler_options (char *options)
+{
+ if (options == NULL)
+ return;
+
+ while (*options)
+ {
+ /* Skip empty options. */
+ if (*options == ',')
+ {
+ ++ options;
+ continue;
+ }
+
+ parse_option (options);
+
+ while (*options != ',' && *options != '\0')
+ ++ options;
+ }
+}
+
+/* Disassemble ARC instructions. */
+
+static int
+print_insn_arc (bfd_vma memaddr,
+ struct disassemble_info *info)
+{
+ bfd_byte buffer[4];
+ unsigned int lowbyte, highbyte;
+ int status;
+ unsigned int insn_len;
+ unsigned insn[2] = { 0, 0 };
+ unsigned isa_mask;
+ const struct arc_opcode *opcode;
+ bfd_boolean need_comma;
+ bfd_boolean open_braket;
+ int size;
+ const struct arc_operand *operand;
+ int value;
+ struct arc_operand_iterator iter;
+ Elf_Internal_Ehdr *header = NULL;
+
+ if (info->disassembler_options)
+ {
+ parse_disassembler_options (info->disassembler_options);
+
+ /* Avoid repeated parsing of the options. */
+ info->disassembler_options = NULL;
+ }
+
+ memset (&iter, 0, sizeof (iter));
+ lowbyte = ((info->endian == BFD_ENDIAN_LITTLE) ? 1 : 0);
+ highbyte = ((info->endian == BFD_ENDIAN_LITTLE) ? 0 : 1);
+
+ if (info->section && info->section->owner)
+ header = elf_elfheader (info->section->owner);
+
+ switch (info->mach)
+ {
+ case bfd_mach_arc_arc700:
+ isa_mask = ARC_OPCODE_ARC700;
+ break;
+
+ case bfd_mach_arc_arc600:
+ isa_mask = ARC_OPCODE_ARC600;
+ break;
+
+ case bfd_mach_arc_arcv2:
+ default:
+ isa_mask = ARC_OPCODE_ARCv2EM;
+ if ((header->e_flags & EF_ARC_MACH_MSK) == EF_ARC_CPU_ARCV2HS)
+ {
+ isa_mask = ARC_OPCODE_ARCv2HS;
+ /* FPU instructions are not extensions for HS. */
+ add_to_decodelist (FLOAT, SP);
+ add_to_decodelist (FLOAT, DP);
+ add_to_decodelist (FLOAT, CVT);
+ }
+ break;
+ }
+
+ /* This variable may be set by the instruction decoder. It suggests
+ the number of bytes objdump should display on a single line. If
+ the instruction decoder sets this, it should always set it to
+ the same value in order to get reasonable looking output. */
+
+ info->bytes_per_line = 8;
+
+ /* In the next lines, we set two info variables control the way
+ objdump displays the raw data. For example, if bytes_per_line is
+ 8 and bytes_per_chunk is 4, the output will look like this:
+ 00: 00000000 00000000
+ with the chunks displayed according to "display_endian". */
+
+ if (info->section
+ && !(info->section->flags & SEC_CODE))
+ {
+ /* This is not a CODE section. */
+ switch (info->section->size)
+ {
+ case 1:
+ case 2:
+ case 4:
+ size = info->section->size;
+ break;
+ default:
+ size = (info->section->size & 0x01) ? 1 : 4;
+ break;
+ }
+ info->bytes_per_chunk = 1;
+ info->display_endian = info->endian;
+ }
+ else
+ {
+ size = 2;
+ info->bytes_per_chunk = 2;
+ info->display_endian = info->endian;
+ }
+
+ /* Read the insn into a host word. */
+ status = (*info->read_memory_func) (memaddr, buffer, size, info);
+ if (status != 0)
+ {
+ (*info->memory_error_func) (status, memaddr, info);
+ return -1;
+ }
+
+ if (info->section
+ && !(info->section->flags & SEC_CODE))
+ {
+ /* Data section. */
+ unsigned long data;
+
+ data = bfd_get_bits (buffer, size * 8,
+ info->display_endian == BFD_ENDIAN_BIG);
+ switch (size)
+ {
+ case 1:
+ (*info->fprintf_func) (info->stream, ".byte\t0x%02lx", data);
+ break;
+ case 2:
+ (*info->fprintf_func) (info->stream, ".short\t0x%04lx", data);
+ break;
+ case 4:
+ (*info->fprintf_func) (info->stream, ".word\t0x%08lx", data);
+ break;
+ default:
+ abort ();
+ }
+ return size;
+ }
+
+ insn_len = arc_insn_length (buffer[lowbyte], buffer[highbyte], info);
+ pr_debug ("instruction length = %d bytes\n", insn_len);
+
+ switch (insn_len)
+ {
+ case 2:
+ insn[0] = (buffer[lowbyte] << 8) | buffer[highbyte];
+ break;
+
+ default:
+ /* An unknown instruction is treated as being length 4. This is
+ possibly not the best solution, but matches the behaviour that was
+ in place before the table based instruction length look-up was
+ introduced. */
+ case 4:
+ /* This is a long instruction: Read the remaning 2 bytes. */
+ status = (*info->read_memory_func) (memaddr + 2, &buffer[2], 2, info);
+ if (status != 0)
+ {
+ (*info->memory_error_func) (status, memaddr + 2, info);
+ return -1;
+ }
+ insn[0] = ARRANGE_ENDIAN (info, buffer);
+ break;
+ }
+
+ /* Set some defaults for the insn info. */
+ info->insn_info_valid = 1;
+ info->branch_delay_insns = 0;
+ info->data_size = 0;
+ info->insn_type = dis_nonbranch;
+ info->target = 0;
+ info->target2 = 0;
+
+ /* FIXME to be moved in dissasemble_init_for_target. */
+ info->disassembler_needs_relocs = TRUE;
+
+ /* Find the first match in the opcode table. */
+ if (!find_format (memaddr, insn, &insn_len, isa_mask, info, &opcode, &iter))
+ return -1;
+
+ if (!opcode)
+ {
+ if (insn_len == 2)
+ (*info->fprintf_func) (info->stream, ".long %#04x", insn[0]);
+ else
+ (*info->fprintf_func) (info->stream, ".long %#08x", insn[0]);
+
+ info->insn_type = dis_noninsn;
+ return insn_len;
+ }
+
+ /* Print the mnemonic. */
+ (*info->fprintf_func) (info->stream, "%s", opcode->name);
+
+ /* Preselect the insn class. */
+ switch (opcode->insn_class)
+ {
+ case BRANCH:
+ case JUMP:
+ if (!strncmp (opcode->name, "bl", 2)
+ || !strncmp (opcode->name, "jl", 2))
+ {
+ if (opcode->subclass == COND)
+ info->insn_type = dis_condjsr;
+ else
+ info->insn_type = dis_jsr;
+ }
+ else
+ {
+ if (opcode->subclass == COND)
+ info->insn_type = dis_condbranch;
+ else
+ info->insn_type = dis_branch;
+ }
+ break;
+ case MEMORY:
+ info->insn_type = dis_dref; /* FIXME! DB indicates mov as memory! */
+ break;
+ default:
+ info->insn_type = dis_nonbranch;
+ break;
+ }
+
+ pr_debug ("%s: 0x%08x\n", opcode->name, opcode->opcode);
+
+ print_flags (opcode, insn, info);
+
+ if (opcode->operands[0] != 0)
+ (*info->fprintf_func) (info->stream, "\t");
+
+ need_comma = FALSE;
+ open_braket = FALSE;
+
+ /* Now extract and print the operands. */
+ operand = NULL;
+ while (operand_iterator_next (&iter, &operand, &value))
+ {
+ if (open_braket && (operand->flags & ARC_OPERAND_BRAKET))
+ {
+ (*info->fprintf_func) (info->stream, "]");
+ open_braket = FALSE;
+ continue;
+ }
+
+ /* Only take input from real operands. */
+ if ((operand->flags & ARC_OPERAND_FAKE)
+ && !(operand->flags & ARC_OPERAND_BRAKET))
+ continue;
+
+ if ((operand->flags & ARC_OPERAND_IGNORE)
+ && (operand->flags & ARC_OPERAND_IR)
+ && value == -1)
+ continue;
+
+ if (need_comma)
+ (*info->fprintf_func) (info->stream, ",");
+
+ if (!open_braket && (operand->flags & ARC_OPERAND_BRAKET))
+ {
+ (*info->fprintf_func) (info->stream, "[");
+ open_braket = TRUE;
+ need_comma = FALSE;
+ continue;
+ }
+
+ /* Print the operand as directed by the flags. */
+ if (operand->flags & ARC_OPERAND_IR)
+ {
+ const char *rname;
+
+ assert (value >=0 && value < 64);
+ rname = arcExtMap_coreRegName (value);
+ if (!rname)
+ rname = regnames[value];
+ (*info->fprintf_func) (info->stream, "%s", rname);
+ if (operand->flags & ARC_OPERAND_TRUNCATE)
{
- value = (*operand->extract) (insn, operand, mods,
- &opval, (int *) NULL);
+ rname = arcExtMap_coreRegName (value + 1);
+ if (!rname)
+ rname = regnames[value + 1];
+ (*info->fprintf_func) (info->stream, "%s", rname);
}
+ }
+ else if (operand->flags & ARC_OPERAND_LIMM)
+ {
+ const char *rname = get_auxreg (opcode, value, isa_mask);
+ if (rname && open_braket)
+ (*info->fprintf_func) (info->stream, "%s", rname);
else
{
- value = (insn[0] >> operand->shift) & ((1 << operand->bits) - 1);
- if ((operand->flags & ARC_OPERAND_SIGNED)
- && (value & (1 << (operand->bits - 1))))
- value -= 1 << operand->bits;
-
- /* If this is a suffix operand, set `opval'. */
- if (operand->flags & ARC_OPERAND_SUFFIX)
- opval = arc_opcode_lookup_suffix (operand, value);
+ (*info->fprintf_func) (info->stream, "%#x", value);
+ if (info->insn_type == dis_branch
+ || info->insn_type == dis_jsr)
+ info->target = (bfd_vma) value;
}
+ }
+ else if (operand->flags & ARC_OPERAND_PCREL)
+ {
+ /* PCL relative. */
+ if (info->flags & INSN_HAS_RELOC)
+ memaddr = 0;
+ (*info->print_address_func) ((memaddr & ~3) + value, info);
- /* Print the operand as directed by the flags. */
- if (operand->flags & ARC_OPERAND_FAKE)
- ; /* nothing to do (??? at least not yet) */
- else if (operand->flags & ARC_OPERAND_SUFFIX)
+ info->target = (bfd_vma) (memaddr & ~3) + value;
+ }
+ else if (operand->flags & ARC_OPERAND_SIGNED)
+ {
+ const char *rname = get_auxreg (opcode, value, isa_mask);
+ if (rname && open_braket)
+ (*info->fprintf_func) (info->stream, "%s", rname);
+ else
+ (*info->fprintf_func) (info->stream, "%d", value);
+ }
+ else
+ {
+ if (operand->flags & ARC_OPERAND_TRUNCATE
+ && !(operand->flags & ARC_OPERAND_ALIGNED32)
+ && !(operand->flags & ARC_OPERAND_ALIGNED16)
+ && value > 0 && value <= 14)
+ (*info->fprintf_func) (info->stream, "r13-%s",
+ regnames[13 + value - 1]);
+ else
{
- /* Default suffixes aren't printed. Fortunately, they all have
- zero values. Also, zero values for boolean suffixes are
- represented by the absence of text. */
-
- if (value != 0)
- {
- /* ??? OPVAL should have a value. If it doesn't just cope
- as we want disassembly to be reasonably robust.
- Also remember that several condition code values (16-31)
- aren't defined yet. For these cases just print the
- number suitably decorated. */
- if (opval)
- (*func) (stream, "%s%s",
- mods & ARC_MOD_DOT ? "." : "",
- opval->name);
- else
- (*func) (stream, "%s%c%d",
- mods & ARC_MOD_DOT ? "." : "",
- operand->fmt, value);
- }
+ const char *rname = get_auxreg (opcode, value, isa_mask);
+ if (rname && open_braket)
+ (*info->fprintf_func) (info->stream, "%s", rname);
+ else
+ (*info->fprintf_func) (info->stream, "%#x", value);
}
- else if (operand->flags & ARC_OPERAND_RELATIVE_BRANCH)
- (*info->print_address_func) (pc + 4 + value, info);
- /* ??? Not all cases of this are currently caught. */
- else if (operand->flags & ARC_OPERAND_ABSOLUTE_BRANCH)
- (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
- else if (operand->flags & ARC_OPERAND_ADDRESS)
- (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
- else if (opval)
- /* Note that this case catches both normal and auxiliary regs. */
- (*func) (stream, "%s", opval->name);
- else
- (*func) (stream, "%ld", value);
}
- /* We have found and printed an instruction; return. */
- return got_limm_p ? 8 : 4;
+ need_comma = TRUE;
}
- (*func) (stream, _("*unknown*"));
- return 4;
+ return insn_len;
}
-/* Given MACH, one of bfd_mach_arc_xxx, return the print_insn function to use.
- This does things a non-standard way (the "standard" way would be to copy
- this code into disassemble.c). Since there are more than a couple of
- variants, hiding all this crud here seems cleaner. */
disassembler_ftype
-arc_get_disassembler (mach, big_p)
- int mach;
- int big_p;
+arc_get_disassembler (bfd *abfd)
{
- switch (mach)
- {
- case bfd_mach_arc_base:
- return big_p ? print_insn_arc_base_big : print_insn_arc_base_little;
- }
- return print_insn_arc_base_little;
+ /* Read the extenssion insns and registers, if any. */
+ build_ARC_extmap (abfd);
+#ifdef DEBUG
+ dump_ARC_extmap ();
+#endif
+
+ return print_insn_arc;
}
-static int
-print_insn_arc_base_little (pc, info)
- bfd_vma pc;
- disassemble_info *info;
+/* Disassemble ARC instructions. Used by debugger. */
+
+struct arcDisState
+arcAnalyzeInstr (bfd_vma memaddr,
+ struct disassemble_info *info)
{
- return print_insn (pc, info, bfd_mach_arc_base, 0);
+ struct arcDisState ret;
+ memset (&ret, 0, sizeof (struct arcDisState));
+
+ ret.instructionLen = print_insn_arc (memaddr, info);
+
+#if 0
+ ret.words[0] = insn[0];
+ ret.words[1] = insn[1];
+ ret._this = &ret;
+ ret.coreRegName = _coreRegName;
+ ret.auxRegName = _auxRegName;
+ ret.condCodeName = _condCodeName;
+ ret.instName = _instName;
+#endif
+
+ return ret;
}
-static int
-print_insn_arc_base_big (pc, info)
- bfd_vma pc;
- disassemble_info *info;
+void
+print_arc_disassembler_options (FILE *stream)
{
- return print_insn (pc, info, bfd_mach_arc_base, 1);
+ fprintf (stream, _("\n\
+The following ARC specific disassembler options are supported for use \n\
+with -M switch (multiple options should be separated by commas):\n"));
+
+ fprintf (stream, _("\
+ dsp Recognize DSP instructions.\n"));
+ fprintf (stream, _("\
+ spfp Recognize FPX SP instructions.\n"));
+ fprintf (stream, _("\
+ dpfp Recognize FPX DP instructions.\n"));
+ fprintf (stream, _("\
+ quarkse_em Recognize FPU QuarkSE-EM instructions.\n"));
+ fprintf (stream, _("\
+ fpuda Recognize double assist FPU instructions.\n"));
+ fprintf (stream, _("\
+ fpus Recognize single precision FPU instructions.\n"));
+ fprintf (stream, _("\
+ fpud Recognize double precision FPU instructions.\n"));
}
+
+
+/* Local variables:
+ eval: (c-set-style "gnu")
+ indent-tabs-mode: t
+ End: */
projects / deliverable / binutils-gdb.git / blobdiff