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// SPDX-License-Identifier: GPL-2.0-or-later
/* Disassemble SPU instructions
Copyright 2006 Free Software Foundation, Inc.
This file is part of GDB, GAS, and the GNU binutils.
*/
#include <linux/string.h>
#include "nonstdio.h"
#include "ansidecl.h"
#include "spu.h"
#include "dis-asm.h"
/* This file provides a disassembler function which uses
the disassembler interface defined in dis-asm.h. */
extern const struct spu_opcode spu_opcodes[];
extern const int spu_num_opcodes;
#define SPU_DISASM_TBL_SIZE (1 << 11)
static const struct spu_opcode *spu_disassemble_table[SPU_DISASM_TBL_SIZE];
static void
init_spu_disassemble (void)
{
int i;
/* If two instructions have the same opcode then we prefer the first
* one. In most cases it is just an alternate mnemonic. */
for (i = 0; i < spu_num_opcodes; i++)
{
int o = spu_opcodes[i].opcode;
if (o >= SPU_DISASM_TBL_SIZE)
continue; /* abort (); */
if (spu_disassemble_table[o] == 0)
spu_disassemble_table[o] = &spu_opcodes[i];
}
}
/* Determine the instruction from the 10 least significant bits. */
static const struct spu_opcode *
get_index_for_opcode (unsigned int insn)
{
const struct spu_opcode *index;
unsigned int opcode = insn >> (32-11);
/* Init the table. This assumes that element 0/opcode 0 (currently
* NOP) is always used */
if (spu_disassemble_table[0] == 0)
init_spu_disassemble ();
if ((index = spu_disassemble_table[opcode & 0x780]) != 0
&& index->insn_type == RRR)
return index;
if ((index = spu_disassemble_table[opcode & 0x7f0]) != 0
&& (index->insn_type == RI18 || index->insn_type == LBT))
return index;
if ((index = spu_disassemble_table[opcode & 0x7f8]) != 0
&& index->insn_type == RI10)
return index;
if ((index = spu_disassemble_table[opcode & 0x7fc]) != 0
&& (index->insn_type == RI16))
return index;
if ((index = spu_disassemble_table[opcode & 0x7fe]) != 0
&& (index->insn_type == RI8))
return index;
if ((index = spu_disassemble_table[opcode & 0x7ff]) != 0)
return index;
return NULL;
}
/* Print a Spu instruction. */
int
print_insn_spu (unsigned long insn, unsigned long memaddr)
{
int value;
int hex_value;
const struct spu_opcode *index;
enum spu_insns tag;
index = get_index_for_opcode (insn);
if (index == 0)
{
printf(".long 0x%lx", insn);
}
else
{
int i;
int paren = 0;
tag = (enum spu_insns)(index - spu_opcodes);
printf("%s", index->mnemonic);
if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag == M_BISLED
|| tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag == M_BIZ
|| tag == M_SYNC || tag == M_HBR)
{
int fb = (insn >> (32-18)) & 0x7f;
if (fb & 0x40)
printf(tag == M_SYNC ? "c" : "p");
if (fb & 0x20)
printf("d");
if (fb & 0x10)
printf("e");
}
if (index->arg[0] != 0)
printf("\t");
hex_value = 0;
for (i = 1; i <= index->arg[0]; i++)
{
int arg = index->arg[i];
if (arg != A_P && !paren && i > 1)
printf(",");
switch (arg)
{
case A_T:
printf("$%lu",
DECODE_INSN_RT (insn));
break;
case A_A:
printf("$%lu",
DECODE_INSN_RA (insn));
break;
case A_B:
printf("$%lu",
DECODE_INSN_RB (insn));
break;
case A_C:
printf("$%lu",
DECODE_INSN_RC (insn));
break;
case A_S:
printf("$sp%lu",
DECODE_INSN_RA (insn));
break;
case A_H:
printf("$ch%lu",
DECODE_INSN_RA (insn));
break;
case A_P:
paren++;
printf("(");
break;
case A_U7A:
printf("%lu",
173 - DECODE_INSN_U8 (insn));
break;
case A_U7B:
printf("%lu",
155 - DECODE_INSN_U8 (insn));
break;
case A_S3:
case A_S6:
case A_S7:
case A_S7N:
case A_U3:
case A_U5:
case A_U6:
case A_U7:
hex_value = DECODE_INSN_I7 (insn);
printf("%d", hex_value);
break;
case A_S11:
print_address(memaddr + DECODE_INSN_I9a (insn) * 4);
break;
case A_S11I:
print_address(memaddr + DECODE_INSN_I9b (insn) * 4);
break;
case A_S10:
case A_S10B:
hex_value = DECODE_INSN_I10 (insn);
printf("%d", hex_value);
break;
case A_S14:
hex_value = DECODE_INSN_I10 (insn) * 16;
printf("%d", hex_value);
break;
case A_S16:
hex_value = DECODE_INSN_I16 (insn);
printf("%d", hex_value);
break;
case A_X16:
hex_value = DECODE_INSN_U16 (insn);
printf("%u", hex_value);
break;
case A_R18:
value = DECODE_INSN_I16 (insn) * 4;
if (value == 0)
printf("%d", value);
else
{
hex_value = memaddr + value;
print_address(hex_value & 0x3ffff);
}
break;
case A_S18:
value = DECODE_INSN_U16 (insn) * 4;
if (value == 0)
printf("%d", value);
else
print_address(value);
break;
case A_U18:
value = DECODE_INSN_U18 (insn);
if (value == 0 || 1)
{
hex_value = value;
printf("%u", value);
}
else
print_address(value);
break;
case A_U14:
hex_value = DECODE_INSN_U14 (insn);
printf("%u", hex_value);
break;
}
if (arg != A_P && paren)
{
printf(")");
paren--;
}
}
if (hex_value > 16)
printf("\t# %x", hex_value);
}
return 4;
}
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