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/* TI PRU disassemble routines
Copyright (C) 2014-2020 Free Software Foundation, Inc.
Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
This file is part of the GNU opcodes library.
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 file; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "disassemble.h"
#include "opcode/pru.h"
#include "libiberty.h"
#include <string.h>
#include <assert.h>
/* No symbol table is available when this code runs out in an embedded
system as when it is used for disassembler support in a monitor. */
#if !defined (EMBEDDED_ENV)
#define SYMTAB_AVAILABLE 1
#include "elf-bfd.h"
#include "elf/pru.h"
#endif
/* Length of PRU instruction in bytes. */
#define INSNLEN 4
/* Return a pointer to an pru_opcode struct for a given instruction
opcode, or NULL if there is an error. */
const struct pru_opcode *
pru_find_opcode (unsigned long opcode)
{
const struct pru_opcode *p;
const struct pru_opcode *op = NULL;
const struct pru_opcode *pseudo_op = NULL;
for (p = pru_opcodes; p < &pru_opcodes[NUMOPCODES]; p++)
{
if ((p->mask & opcode) == p->match)
{
if ((p->pinfo & PRU_INSN_MACRO) == PRU_INSN_MACRO)
pseudo_op = p;
else if ((p->pinfo & PRU_INSN_LDI32) == PRU_INSN_LDI32)
/* ignore - should be caught with regular patterns */;
else
op = p;
}
}
return pseudo_op ? pseudo_op : op;
}
/* There are 32 regular registers, each with 8 possible subfield selectors. */
#define NUMREGNAMES (32 * 8)
static void
pru_print_insn_arg_reg (unsigned int r, unsigned int sel,
disassemble_info *info)
{
unsigned int i = r * RSEL_NUM_ITEMS + sel;
assert (i < (unsigned int)pru_num_regs);
assert (i < NUMREGNAMES);
(*info->fprintf_func) (info->stream, "%s", pru_regs[i].name);
}
/* The function pru_print_insn_arg uses the character pointed
to by ARGPTR to determine how it print the next token or separator
character in the arguments to an instruction. */
static int
pru_print_insn_arg (const char *argptr,
unsigned long opcode, bfd_vma address,
disassemble_info *info)
{
long offs = 0;
unsigned long i = 0;
unsigned long io = 0;
switch (*argptr)
{
case ',':
(*info->fprintf_func) (info->stream, "%c ", *argptr);
break;
case 'd':
pru_print_insn_arg_reg (GET_INSN_FIELD (RD, opcode),
GET_INSN_FIELD (RDSEL, opcode),
info);
break;
case 'D':
/* The first 4 values for RDB and RSEL are the same, so we
can reuse some code. */
pru_print_insn_arg_reg (GET_INSN_FIELD (RD, opcode),
GET_INSN_FIELD (RDB, opcode),
info);
break;
case 's':
pru_print_insn_arg_reg (GET_INSN_FIELD (RS1, opcode),
GET_INSN_FIELD (RS1SEL, opcode),
info);
break;
case 'S':
pru_print_insn_arg_reg (GET_INSN_FIELD (RS1, opcode),
RSEL_31_0,
info);
break;
case 'b':
io = GET_INSN_FIELD (IO, opcode);
if (io)
{
i = GET_INSN_FIELD (IMM8, opcode);
(*info->fprintf_func) (info->stream, "%ld", i);
}
else
{
pru_print_insn_arg_reg (GET_INSN_FIELD (RS2, opcode),
GET_INSN_FIELD (RS2SEL, opcode),
info);
}
break;
case 'B':
io = GET_INSN_FIELD (IO, opcode);
if (io)
{
i = GET_INSN_FIELD (IMM8, opcode) + 1;
(*info->fprintf_func) (info->stream, "%ld", i);
}
else
{
pru_print_insn_arg_reg (GET_INSN_FIELD (RS2, opcode),
GET_INSN_FIELD (RS2SEL, opcode),
info);
}
break;
case 'j':
io = GET_INSN_FIELD (IO, opcode);
if (io)
{
/* For the sake of pretty-printing, dump text addresses with
their "virtual" offset that we use for distinguishing
PMEM vs DMEM. This is needed for printing the correct text
labels. */
bfd_vma text_offset = address & ~0x3fffff;
i = GET_INSN_FIELD (IMM16, opcode) * 4;
(*info->print_address_func) (i + text_offset, info);
}
else
{
pru_print_insn_arg_reg (GET_INSN_FIELD (RS2, opcode),
GET_INSN_FIELD (RS2SEL, opcode),
info);
}
break;
case 'W':
i = GET_INSN_FIELD (IMM16, opcode);
(*info->fprintf_func) (info->stream, "%ld", i);
break;
case 'o':
offs = GET_BROFF_SIGNED (opcode) * 4;
(*info->print_address_func) (address + offs, info);
break;
case 'O':
offs = GET_INSN_FIELD (LOOP_JMPOFFS, opcode) * 4;
(*info->print_address_func) (address + offs, info);
break;
case 'l':
i = GET_BURSTLEN (opcode);
if (i < LSSBBO_BYTECOUNT_R0_BITS7_0)
(*info->fprintf_func) (info->stream, "%ld", i + 1);
else
{
i -= LSSBBO_BYTECOUNT_R0_BITS7_0;
(*info->fprintf_func) (info->stream, "r0.b%ld", i);
}
break;
case 'n':
i = GET_INSN_FIELD (XFR_LENGTH, opcode);
if (i < LSSBBO_BYTECOUNT_R0_BITS7_0)
(*info->fprintf_func) (info->stream, "%ld", i + 1);
else
{
i -= LSSBBO_BYTECOUNT_R0_BITS7_0;
(*info->fprintf_func) (info->stream, "r0.b%ld", i);
}
break;
case 'c':
i = GET_INSN_FIELD (CB, opcode);
(*info->fprintf_func) (info->stream, "%ld", i);
break;
case 'w':
i = GET_INSN_FIELD (WAKEONSTATUS, opcode);
(*info->fprintf_func) (info->stream, "%ld", i);
break;
case 'x':
i = GET_INSN_FIELD (XFR_WBA, opcode);
(*info->fprintf_func) (info->stream, "%ld", i);
break;
default:
(*info->fprintf_func) (info->stream, "unknown");
break;
}
return 0;
}
/* pru_disassemble does all the work of disassembling a PRU
instruction opcode. */
static int
pru_disassemble (bfd_vma address, unsigned long opcode,
disassemble_info *info)
{
const struct pru_opcode *op;
info->bytes_per_line = INSNLEN;
info->bytes_per_chunk = INSNLEN;
info->display_endian = info->endian;
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;
/* Find the major opcode and use this to disassemble
the instruction and its arguments. */
op = pru_find_opcode (opcode);
if (op != NULL)
{
(*info->fprintf_func) (info->stream, "%s", op->name);
const char *argstr = op->args;
if (argstr != NULL && *argstr != '\0')
{
(*info->fprintf_func) (info->stream, "\t");
while (*argstr != '\0')
{
pru_print_insn_arg (argstr, opcode, address, info);
++argstr;
}
}
}
else
{
/* Handle undefined instructions. */
info->insn_type = dis_noninsn;
(*info->fprintf_func) (info->stream, "0x%lx", opcode);
}
/* Tell the caller how far to advance the program counter. */
return INSNLEN;
}
/* print_insn_pru is the main disassemble function for PRU. */
int
print_insn_pru (bfd_vma address, disassemble_info *info)
{
bfd_byte buffer[INSNLEN];
int status;
status = (*info->read_memory_func) (address, buffer, INSNLEN, info);
if (status == 0)
{
unsigned long insn;
insn = (unsigned long) bfd_getl32 (buffer);
status = pru_disassemble (address, insn, info);
}
else
{
(*info->memory_error_func) (status, address, info);
status = -1;
}
return status;
}
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