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binutils-gdb/opcodes/sparc-dis.c
David Edelsohn 28661653c7 (build_hash_table): Fix memory leak. 
(print_insn_sparc, print_insn_sparc64): Clean up comments regarding
switching between sparc32 and sparc64.
1995-08-02 17:15:07 +00:00

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/* Print SPARC instructions.
Copyright 1989, 1991, 1992, 1993, 1995 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.
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.
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. */
#include "ansidecl.h"
#include "opcode/sparc.h"
#include "dis-asm.h"
#include "libiberty.h"
#include <string.h>
/* For faster lookup, after insns are sorted they are hashed. */
/* ??? I think there is room for even more improvement. */
#define HASH_SIZE 256
/* It is important that we only look at insn code bits as that is how the
opcode table is hashed. OPCODE_BITS is a table of valid bits for each
of the main types (0,1,2,3). */
static int opcode_bits[4] = { 0x01c00000, 0x0, 0x01f80000, 0x01f80000 };
#define HASH_INSN(INSN) \
((((INSN) >> 24) & 0xc0) | (((INSN) & opcode_bits[((INSN) >> 30) & 3]) >> 19))
struct opcode_hash {
struct opcode_hash *next;
struct sparc_opcode *opcode;
};
static struct opcode_hash *opcode_hash_table[HASH_SIZE];
static void build_hash_table ();
/* Sign-extend a value which is N bits long. */
#define SEX(value, bits) \
((((int)(value)) << ((8 * sizeof (int)) - bits)) \
>> ((8 * sizeof (int)) - bits) )
static char *reg_names[] =
{ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
#ifndef NO_V9
"f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
"f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47",
"f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55",
"f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63",
/* psr, wim, tbr, fpsr, cpsr are v8 only. */
#endif
"y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr"
};
#define freg_names (&reg_names[4 * 8])
#ifndef NO_V9
/* These are ordered according to there register number in
rdpr and wrpr insns. */
static char *v9_priv_reg_names[] =
{
"tpc", "tnpc", "tstate", "tt", "tick", "tba", "pstate", "tl",
"pil", "cwp", "cansave", "canrestore", "cleanwin", "otherwin",
"wstate", "fq"
/* "ver" - special cased */
};
#endif
/* Macros used to extract instruction fields. Not all fields have
macros defined here, only those which are actually used. */
#define X_RD(i) (((i) >> 25) & 0x1f)
#define X_RS1(i) (((i) >> 14) & 0x1f)
#define X_LDST_I(i) (((i) >> 13) & 1)
#define X_ASI(i) (((i) >> 5) & 0xff)
#define X_RS2(i) (((i) >> 0) & 0x1f)
#define X_IMM13(i) (((i) >> 0) & 0x1fff)
#define X_DISP22(i) (((i) >> 0) & 0x3fffff)
#define X_IMM22(i) X_DISP22 (i)
#define X_DISP30(i) (((i) >> 0) & 0x3fffffff)
#ifndef NO_V9
#define X_DISP16(i) (((((i) >> 20) & 3) << 14) | (((i) >> 0) & 0x3fff))
#endif
/* Here is the union which was used to extract instruction fields
before the shift and mask macros were written.
union sparc_insn
{
unsigned long int code;
struct
{
unsigned int anop:2;
#define op ldst.anop
unsigned int anrd:5;
#define rd ldst.anrd
unsigned int op3:6;
unsigned int anrs1:5;
#define rs1 ldst.anrs1
unsigned int i:1;
unsigned int anasi:8;
#define asi ldst.anasi
unsigned int anrs2:5;
#define rs2 ldst.anrs2
#define shcnt rs2
} ldst;
struct
{
unsigned int anop:2, anrd:5, op3:6, anrs1:5, i:1;
unsigned int IMM13:13;
#define imm13 IMM13.IMM13
} IMM13;
struct
{
unsigned int anop:2;
unsigned int a:1;
unsigned int cond:4;
unsigned int op2:3;
unsigned int DISP22:22;
#define disp22 branch.DISP22
#define imm22 disp22
} branch;
#ifndef NO_V9
struct
{
unsigned int anop:2;
unsigned int a:1;
unsigned int z:1;
unsigned int rcond:3;
unsigned int op2:3;
unsigned int DISP16HI:2;
unsigned int p:1;
unsigned int _rs1:5;
unsigned int DISP16LO:14;
} branch16;
#endif
struct
{
unsigned int anop:2;
unsigned int adisp30:30;
#define disp30 call.adisp30
} call;
};
*/
/* Nonzero if INSN is the opcode for a delayed branch. */
static int
is_delayed_branch (insn)
unsigned long insn;
{
struct opcode_hash *op;
for (op = opcode_hash_table[HASH_INSN (insn)]; op; op = op->next)
{
CONST struct sparc_opcode *opcode = op->opcode;
if ((opcode->match & insn) == opcode->match
&& (opcode->lose & insn) == 0)
return (opcode->flags & F_DELAYED);
}
return 0;
}
/* Nonzero of opcode table has been initialized. */
static int opcodes_initialized = 0;
/* Nonzero of the current architecture is sparc64.
This is kept in a global because compare_opcodes uses it. */
static int sparc64_p;
/* extern void qsort (); */
static int compare_opcodes ();
/* Print one instruction from MEMADDR on INFO->STREAM.
We suffix the instruction with a comment that gives the absolute
address involved, as well as its symbolic form, if the instruction
is preceded by a findable `sethi' and it either adds an immediate
displacement to that register, or it is an `add' or `or' instruction
on that register. */
static int
print_insn (memaddr, info)
bfd_vma memaddr;
disassemble_info *info;
{
FILE *stream = info->stream;
bfd_byte buffer[4];
unsigned long insn;
register unsigned int i;
register struct opcode_hash *op;
if (!opcodes_initialized)
{
qsort ((char *) sparc_opcodes, NUMOPCODES,
sizeof (sparc_opcodes[0]), compare_opcodes);
build_hash_table (sparc_opcodes, opcode_hash_table, NUMOPCODES);
opcodes_initialized = 1;
}
{
int status =
(*info->read_memory_func) (memaddr, buffer, sizeof (buffer), info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
}
insn = bfd_getb32 (buffer);
info->insn_info_valid = 1; /* We do return this info */
info->insn_type = dis_nonbranch; /* Assume non branch insn */
info->branch_delay_insns = 0; /* Assume no delay */
info->target = 0; /* Assume no target known */
for (op = opcode_hash_table[HASH_INSN (insn)]; op; op = op->next)
{
CONST struct sparc_opcode *opcode = op->opcode;
if ((opcode->match & insn) == opcode->match
&& (opcode->lose & insn) == 0)
{
/* Nonzero means that we have found an instruction which has
the effect of adding or or'ing the imm13 field to rs1. */
int imm_added_to_rs1 = 0;
/* Nonzero means that we have found a plus sign in the args
field of the opcode table. */
int found_plus = 0;
/* Nonzero means we have an annulled branch. */
int is_annulled = 0;
/* Do we have an `add' or `or' instruction where rs1 is the same
as rsd, and which has the i bit set? */
if ((opcode->match == 0x80102000 || opcode->match == 0x80002000)
/* (or) (add) */
&& X_RS1 (insn) == X_RD (insn))
imm_added_to_rs1 = 1;
if (X_RS1 (insn) != X_RD (insn)
&& strchr (opcode->args, 'r') != 0)
/* Can't do simple format if source and dest are different. */
continue;
(*info->fprintf_func) (stream, opcode->name);
{
register CONST char *s;
if (opcode->args[0] != ',')
(*info->fprintf_func) (stream, " ");
for (s = opcode->args; *s != '\0'; ++s)
{
while (*s == ',')
{
(*info->fprintf_func) (stream, ",");
++s;
switch (*s) {
case 'a':
(*info->fprintf_func) (stream, "a");
is_annulled = 1;
++s;
continue;
#ifndef NO_V9
case 'N':
(*info->fprintf_func) (stream, "pn");
++s;
continue;
case 'T':
(*info->fprintf_func) (stream, "pt");
++s;
continue;
#endif /* NO_V9 */
default:
break;
} /* switch on arg */
} /* while there are comma started args */
(*info->fprintf_func) (stream, " ");
switch (*s)
{
case '+':
found_plus = 1;
/* note fall-through */
default:
(*info->fprintf_func) (stream, "%c", *s);
break;
case '#':
(*info->fprintf_func) (stream, "0");
break;
#define reg(n) (*info->fprintf_func) (stream, "%%%s", reg_names[n])
case '1':
case 'r':
reg (X_RS1 (insn));
break;
case '2':
reg (X_RS2 (insn));
break;
case 'd':
reg (X_RD (insn));
break;
#undef reg
#define freg(n) (*info->fprintf_func) (stream, "%%%s", freg_names[n])
#define fregx(n) (*info->fprintf_func) (stream, "%%%s", freg_names[((n) & ~1) | (((n) & 1) << 5)])
case 'e':
freg (X_RS1 (insn));
break;
case 'v': /* double/even */
case 'V': /* quad/multiple of 4 */
fregx (X_RS1 (insn));
break;
case 'f':
freg (X_RS2 (insn));
break;
case 'B': /* double/even */
case 'R': /* quad/multiple of 4 */
fregx (X_RS2 (insn));
break;
case 'g':
freg (X_RD (insn));
break;
case 'H': /* double/even */
case 'J': /* quad/multiple of 4 */
fregx (X_RD (insn));
break;
#undef freg
#undef fregx
#define creg(n) (*info->fprintf_func) (stream, "%%c%u", (unsigned int) (n))
case 'b':
creg (X_RS1 (insn));
break;
case 'c':
creg (X_RS2 (insn));
break;
case 'D':
creg (X_RD (insn));
break;
#undef creg
case 'h':
(*info->fprintf_func) (stream, "%%hi(%#x)",
(0xFFFFFFFF
& ((int) X_IMM22 (insn) << 10)));
break;
case 'i':
{
int imm = SEX (X_IMM13 (insn), 13);
/* Check to see whether we have a 1+i, and take
note of that fact.
Note: because of the way we sort the table,
we will be matching 1+i rather than i+1,
so it is OK to assume that i is after +,
not before it. */
if (found_plus)
imm_added_to_rs1 = 1;
if (imm <= 9)
(*info->fprintf_func) (stream, "%d", imm);
else
(*info->fprintf_func) (stream, "%#x", imm);
}
break;
#ifndef NO_V9
case 'I': /* 11 bit immediate. */
case 'j': /* 10 bit immediate. */
{
int imm;
if (*s == 'I')
imm = SEX (X_IMM13 (insn), 11);
else
imm = SEX (X_IMM13 (insn), 10);
/* Check to see whether we have a 1+i, and take
note of that fact.
Note: because of the way we sort the table,
we will be matching 1+i rather than i+1,
so it is OK to assume that i is after +,
not before it. */
if (found_plus)
imm_added_to_rs1 = 1;
if (imm <= 9)
(info->fprintf_func) (stream, "%d", imm);
else
(info->fprintf_func) (stream, "%#x", (unsigned) imm);
}
break;
case 'k':
info->target = memaddr + (SEX (X_DISP16 (insn), 16)) * 4;
(*info->print_address_func) (info->target, info);
break;
case 'G':
info->target = memaddr + (SEX (X_DISP22 (insn), 19)) * 4;
(*info->print_address_func) (info->target, info);
break;
case '6':
case '7':
case '8':
case '9':
(*info->fprintf_func) (stream, "%%fcc%c", *s - '6' + '0');
break;
case 'z':
(*info->fprintf_func) (stream, "%%icc");
break;
case 'Z':
(*info->fprintf_func) (stream, "%%xcc");
break;
case 'E':
(*info->fprintf_func) (stream, "%%ccr");
break;
case 's':
(*info->fprintf_func) (stream, "%%fprs");
break;
case 'o':
(*info->fprintf_func) (stream, "%%asi");
break;
case 'W':
(*info->fprintf_func) (stream, "%%tick");
break;
case 'P':
(*info->fprintf_func) (stream, "%%pc");
break;
case '?':
if (X_RS1 (insn) == 31)
(*info->fprintf_func) (stream, "%%ver");
else if ((unsigned) X_RS1 (insn) < 16)
(*info->fprintf_func) (stream, "%%%s",
v9_priv_reg_names[X_RS1 (insn)]);
else
(*info->fprintf_func) (stream, "%%reserved");
break;
case '!':
if ((unsigned) X_RD (insn) < 15)
(*info->fprintf_func) (stream, "%%%s",
v9_priv_reg_names[X_RD (insn)]);
else
(*info->fprintf_func) (stream, "%%reserved");
break;
break;
#endif /* NO_V9 */
case 'M':
(*info->fprintf_func) (stream, "%%asr%d", X_RS1 (insn));
break;
case 'm':
(*info->fprintf_func) (stream, "%%asr%d", X_RD (insn));
break;
case 'L':
info->target = memaddr + X_DISP30 (insn) * 4;
(*info->print_address_func) (info->target, info);
break;
case 'n':
(*info->fprintf_func)
(stream, "%#x", (SEX (X_DISP22 (insn), 22)));
break;
case 'l':
info->target = memaddr + (SEX (X_DISP22 (insn), 22)) * 4;
(*info->print_address_func) (info->target, info);
break;
case 'A':
(*info->fprintf_func) (stream, "(%d)", X_ASI (insn));
break;
case 'C':
(*info->fprintf_func) (stream, "%%csr");
break;
case 'F':
(*info->fprintf_func) (stream, "%%fsr");
break;
case 'p':
(*info->fprintf_func) (stream, "%%psr");
break;
case 'q':
(*info->fprintf_func) (stream, "%%fq");
break;
case 'Q':
(*info->fprintf_func) (stream, "%%cq");
break;
case 't':
(*info->fprintf_func) (stream, "%%tbr");
break;
case 'w':
(*info->fprintf_func) (stream, "%%wim");
break;
case 'x':
(*info->fprintf_func) (stream, "%d",
((X_LDST_I (insn) << 8)
+ X_ASI (insn)));
break;
case 'y':
(*info->fprintf_func) (stream, "%%y");
break;
}
}
}
/* If we are adding or or'ing something to rs1, then
check to see whether the previous instruction was
a sethi to the same register as in the sethi.
If so, attempt to print the result of the add or
or (in this context add and or do the same thing)
and its symbolic value. */
if (imm_added_to_rs1)
{
unsigned long prev_insn;
int errcode;
errcode =
(*info->read_memory_func)
(memaddr - 4, buffer, sizeof (buffer), info);
prev_insn = bfd_getb32 (buffer);
if (errcode == 0)
{
/* If it is a delayed branch, we need to look at the
instruction before the delayed branch. This handles
sequences such as
sethi %o1, %hi(_foo), %o1
call _printf
or %o1, %lo(_foo), %o1
*/
if (is_delayed_branch (prev_insn))
{
errcode = (*info->read_memory_func)
(memaddr - 8, buffer, sizeof (buffer), info);
prev_insn = bfd_getb32 (buffer);
}
}
/* If there was a problem reading memory, then assume
the previous instruction was not sethi. */
if (errcode == 0)
{
/* Is it sethi to the same register? */
if ((prev_insn & 0xc1c00000) == 0x01000000
&& X_RD (prev_insn) == X_RS1 (insn))
{
(*info->fprintf_func) (stream, "\t! ");
info->target =
(0xFFFFFFFF & (int) X_IMM22 (prev_insn) << 10)
| SEX (X_IMM13 (insn), 13);
(*info->print_address_func) (info->target, info);
info->insn_type = dis_dref;
info->data_size = 4; /* FIXME!!! */
}
}
}
if (opcode->flags & (F_UNBR|F_CONDBR|F_JSR))
{
/* FIXME -- check is_annulled flag */
if (opcode->flags & F_UNBR)
info->insn_type = dis_branch;
if (opcode->flags & F_CONDBR)
info->insn_type = dis_condbranch;
if (opcode->flags & F_JSR)
info->insn_type = dis_jsr;
if (opcode->flags & F_DELAYED)
info->branch_delay_insns = 1;
}
return sizeof (buffer);
}
}
info->insn_type = dis_noninsn; /* Mark as non-valid instruction */
(*info->fprintf_func) (stream, "%#8x", insn);
return sizeof (buffer);
}
/* Compare opcodes A and B. */
static int
compare_opcodes (a, b)
char *a, *b;
{
struct sparc_opcode *op0 = (struct sparc_opcode *) a;
struct sparc_opcode *op1 = (struct sparc_opcode *) b;
unsigned long int match0 = op0->match, match1 = op1->match;
unsigned long int lose0 = op0->lose, lose1 = op1->lose;
register unsigned int i;
/* If a bit is set in both match and lose, there is something
wrong with the opcode table. */
if (match0 & lose0)
{
fprintf (stderr, "Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n",
op0->name, match0, lose0);
op0->lose &= ~op0->match;
lose0 = op0->lose;
}
if (match1 & lose1)
{
fprintf (stderr, "Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n",
op1->name, match1, lose1);
op1->lose &= ~op1->match;
lose1 = op1->lose;
}
/* If the current architecture isn't sparc64, move v9 insns to the end.
Only do this when one isn't v9 and one is. If both are v9 we still
need to properly sort them.
This must be done before checking match and lose. */
if (!sparc64_p
&& (op0->architecture == v9) != (op1->architecture == v9))
return (op0->architecture == v9) - (op1->architecture == v9);
/* If the current architecture is sparc64, move non-v9 insns to the end.
This must be done before checking match and lose. */
if (sparc64_p
&& (op0->flags & F_NOTV9) != (op1->flags & F_NOTV9))
return (op0->flags & F_NOTV9) - (op1->flags & F_NOTV9);
/* Because the bits that are variable in one opcode are constant in
another, it is important to order the opcodes in the right order. */
for (i = 0; i < 32; ++i)
{
unsigned long int x = 1 << i;
int x0 = (match0 & x) != 0;
int x1 = (match1 & x) != 0;
if (x0 != x1)
return x1 - x0;
}
for (i = 0; i < 32; ++i)
{
unsigned long int x = 1 << i;
int x0 = (lose0 & x) != 0;
int x1 = (lose1 & x) != 0;
if (x0 != x1)
return x1 - x0;
}
/* They are functionally equal. So as long as the opcode table is
valid, we can put whichever one first we want, on aesthetic grounds. */
/* Our first aesthetic ground is that aliases defer to real insns. */
{
int alias_diff = (op0->flags & F_ALIAS) - (op1->flags & F_ALIAS);
if (alias_diff != 0)
/* Put the one that isn't an alias first. */
return alias_diff;
}
/* Except for aliases, two "identical" instructions had
better have the same opcode. This is a sanity check on the table. */
i = strcmp (op0->name, op1->name);
if (i)
if (op0->flags & F_ALIAS) /* If they're both aliases, be arbitrary. */
return i;
else
fprintf (stderr,
"Internal error: bad sparc-opcode.h: \"%s\" == \"%s\"\n",
op0->name, op1->name);
/* Fewer arguments are preferred. */
{
int length_diff = strlen (op0->args) - strlen (op1->args);
if (length_diff != 0)
/* Put the one with fewer arguments first. */
return length_diff;
}
/* Put 1+i before i+1. */
{
char *p0 = (char *) strchr(op0->args, '+');
char *p1 = (char *) strchr(op1->args, '+');
if (p0 && p1)
{
/* There is a plus in both operands. Note that a plus
sign cannot be the first character in args,
so the following [-1]'s are valid. */
if (p0[-1] == 'i' && p1[1] == 'i')
/* op0 is i+1 and op1 is 1+i, so op1 goes first. */
return 1;
if (p0[1] == 'i' && p1[-1] == 'i')
/* op0 is 1+i and op1 is i+1, so op0 goes first. */
return -1;
}
}
/* They are, as far as we can tell, identical.
Since qsort may have rearranged the table partially, there is
no way to tell which one was first in the opcode table as
written, so just say there are equal. */
return 0;
}
/* Build a hash table from the opcode table. */
static void
build_hash_table (table, hash_table, num_opcodes)
struct sparc_opcode *table;
struct opcode_hash **hash_table;
int num_opcodes;
{
register int i;
int hash_count[HASH_SIZE];
static struct opcode_hash *hash_buf = NULL;
/* Start at the end of the table and work backwards so that each
chain is sorted. */
memset (hash_table, 0, HASH_SIZE * sizeof (hash_table[0]));
memset (hash_count, 0, HASH_SIZE * sizeof (hash_count[0]));
if (hash_buf != NULL)
free (hash_buf);
hash_buf = (struct opcode_hash *) xmalloc (sizeof (struct opcode_hash) * num_opcodes);
for (i = num_opcodes - 1; i >= 0; --i)
{
register int hash = HASH_INSN (sparc_opcodes[i].match);
register struct opcode_hash *h = &hash_buf[i];
h->next = hash_table[hash];
h->opcode = &sparc_opcodes[i];
hash_table[hash] = h;
++hash_count[hash];
}
#if 0 /* for debugging */
{
int min_count = num_opcodes, max_count = 0;
int total;
for (i = 0; i < HASH_SIZE; ++i)
{
if (hash_count[i] < min_count)
min_count = hash_count[i];
if (hash_count[i] > max_count)
max_count = hash_count[i];
total += hash_count[i];
}
printf ("Opcode hash table stats: min %d, max %d, ave %f\n",
min_count, max_count, (double) total / HASH_SIZE);
}
#endif
}
int
print_insn_sparc (memaddr, info)
bfd_vma memaddr;
disassemble_info *info;
{
/* It could happen that we'll switch cpus in a running program.
Consider objdump or gdb. The frequency of occurrence is expected
to be low enough that our clumsy approach is not a problem. */
if (sparc64_p)
opcodes_initialized = 0;
sparc64_p = 0;
return print_insn (memaddr, info);
}
int
print_insn_sparc64 (memaddr, info)
bfd_vma memaddr;
disassemble_info *info;
{
/* It could happen that we'll switch cpus in a running program.
Consider objdump or gdb. The frequency of occurrence is expected
to be low enough that our clumsy approach is not a problem. */
if (!sparc64_p)
opcodes_initialized = 0;
sparc64_p = 1;
return print_insn (memaddr, info);
}
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