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-rw-r--r--gdb/sparc-pinsn.c465
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diff --git a/gdb/sparc-pinsn.c b/gdb/sparc-pinsn.c
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+/* Disassembler for the sparc.
+ Copyright (C) 1989 Free Software Foundation, Inc.
+
+This file is part of GDB, the GNU disassembler.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <stdio.h>
+
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "sparc-opcode.h"
+#include "gdbcore.h"
+#include "string.h"
+#include "target.h"
+
+extern void qsort ();
+
+
+extern char *reg_names[];
+#define freg_names (&reg_names[4 * 8])
+
+union sparc_insn
+ {
+ unsigned long int code;
+ struct
+ {
+ unsigned int OP:2;
+#define op ldst.OP
+ unsigned int RD:5;
+#define rd ldst.RD
+ unsigned int op3:6;
+ unsigned int RS1:5;
+#define rs1 ldst.RS1
+ unsigned int i:1;
+ unsigned int ASI:8;
+#define asi ldst.ASI
+ unsigned int RS2:5;
+#define rs2 ldst.RS2
+#define shcnt rs2
+ } ldst;
+ struct
+ {
+ unsigned int OP:2, RD:5, op3:6, RS1:5, i:1;
+ unsigned int IMM13:13;
+#define imm13 IMM13.IMM13
+ } IMM13;
+ struct
+ {
+ unsigned int OP:2;
+ unsigned int a:1;
+ unsigned int cond:4;
+ unsigned int op2:3;
+ unsigned int DISP22:22;
+#define disp22 branch.DISP22
+ } branch;
+#define imm22 disp22
+ struct
+ {
+ unsigned int OP:2;
+ unsigned int DISP30:30;
+#define disp30 call.DISP30
+ } call;
+ };
+
+/* Nonzero if INSN is the opcode for a delayed branch. */
+static int
+is_delayed_branch (insn)
+ union sparc_insn insn;
+{
+ unsigned int i;
+
+ for (i = 0; i < NUMOPCODES; ++i)
+ {
+ const struct sparc_opcode *opcode = &sparc_opcodes[i];
+ if ((opcode->match & insn.code) == opcode->match
+ && (opcode->lose & insn.code) == 0)
+ return (opcode->flags & F_DELAYED);
+ }
+ return 0;
+}
+
+static int opcodes_sorted = 0;
+
+/* Print one instruction from MEMADDR on STREAM. */
+int
+print_insn (memaddr, stream)
+ CORE_ADDR memaddr;
+ FILE *stream;
+{
+ union sparc_insn insn;
+
+ register unsigned int i;
+
+ if (!opcodes_sorted)
+ {
+ static int compare_opcodes ();
+ qsort ((char *) sparc_opcodes, NUMOPCODES,
+ sizeof (sparc_opcodes[0]), compare_opcodes);
+ opcodes_sorted = 1;
+ }
+
+ read_memory (memaddr, &insn, sizeof (insn));
+
+ for (i = 0; i < NUMOPCODES; ++i)
+ {
+ const struct sparc_opcode *opcode = &sparc_opcodes[i];
+ if ((opcode->match & insn.code) == opcode->match
+ && (opcode->lose & insn.code) == 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;
+
+ /* Do we have an 'or' instruction where rs1 is the same
+ as rsd, and which has the i bit set? */
+ if (opcode->match == 0x80102000
+ && insn.rs1 == insn.rd)
+ imm_added_to_rs1 = 1;
+
+ if (insn.rs1 != insn.rd
+ && strchr (opcode->args, 'r') != 0)
+ /* Can't do simple format if source and dest are different. */
+ continue;
+
+ fputs_filtered (opcode->name, stream);
+
+ {
+ register const char *s;
+
+ if (opcode->args[0] != ',')
+ fputs_filtered (" ", stream);
+ for (s = opcode->args; *s != '\0'; ++s)
+ {
+ if (*s == ',')
+ {
+ fputs_filtered (",", stream);
+ ++s;
+ if (*s == 'a')
+ {
+ fputs_filtered ("a", stream);
+ ++s;
+ }
+ fputs_filtered (" ", stream);
+ }
+
+ switch (*s)
+ {
+ case '+':
+ found_plus = 1;
+
+ /* note fall-through */
+ default:
+ fprintf_filtered (stream, "%c", *s);
+ break;
+
+ case '#':
+ fputs_filtered ("0", stream);
+ break;
+
+#define reg(n) fprintf_filtered (stream, "%%%s", reg_names[n])
+ case '1':
+ case 'r':
+ reg (insn.rs1);
+ break;
+
+ case '2':
+ reg (insn.rs2);
+ break;
+
+ case 'd':
+ reg (insn.rd);
+ break;
+#undef reg
+
+#define freg(n) fprintf_filtered (stream, "%%%s", freg_names[n])
+ case 'e':
+ freg (insn.rs1);
+ break;
+
+ case 'f':
+ freg (insn.rs2);
+ break;
+
+ case 'g':
+ freg (insn.rd);
+ break;
+#undef freg
+
+#define creg(n) fprintf_filtered (stream, "%%c%u", (unsigned int) (n))
+ case 'b':
+ creg (insn.rs1);
+ break;
+
+ case 'c':
+ creg (insn.rs2);
+ break;
+
+ case 'D':
+ creg (insn.rd);
+ break;
+#undef creg
+
+ case 'h':
+ fprintf_filtered (stream, "%%hi(%#x)",
+ (int) insn.imm22 << 10);
+ break;
+
+ case 'i':
+ {
+ /* We cannot trust the compiler to sign-extend
+ when extracting the bitfield, hence the shifts. */
+ int imm = ((int) insn.imm13 << 19) >> 19;
+
+ /* 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)
+ fprintf_filtered (stream, "%d", imm);
+ else
+ fprintf_filtered (stream, "%#x", imm);
+ }
+ break;
+
+ case 'L':
+ print_address ((CORE_ADDR) memaddr + insn.disp30 * 4,
+ stream);
+ break;
+
+ case 'l':
+ if ((insn.code >> 22) == 0)
+ /* Special case for `unimp'. Don't try to turn
+ it's operand into a function offset. */
+ fprintf_filtered (stream, "%#x",
+ (int) (((int) insn.disp22 << 10) >> 10));
+ else
+ /* We cannot trust the compiler to sign-extend
+ when extracting the bitfield, hence the shifts. */
+ print_address ((CORE_ADDR)
+ (memaddr
+ + (((int) insn.disp22 << 10) >> 10) * 4),
+ stream);
+ break;
+
+ case 'A':
+ fprintf_filtered (stream, "(%d)", (int) insn.asi);
+ break;
+
+ case 'C':
+ fputs_filtered ("%csr", stream);
+ break;
+
+ case 'F':
+ fputs_filtered ("%fsr", stream);
+ break;
+
+ case 'p':
+ fputs_filtered ("%psr", stream);
+ break;
+
+ case 'q':
+ fputs_filtered ("%fq", stream);
+ break;
+
+ case 'Q':
+ fputs_filtered ("%cq", stream);
+ break;
+
+ case 't':
+ fputs_filtered ("%tbr", stream);
+ break;
+
+ case 'w':
+ fputs_filtered ("%wim", stream);
+ break;
+
+ case 'y':
+ fputs_filtered ("%y", stream);
+ 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)
+ {
+ union sparc_insn prev_insn;
+ int errcode;
+
+ errcode = target_read_memory (memaddr - 4,
+ (char *)&prev_insn, sizeof (prev_insn));
+
+ 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 = target_read_memory
+ (memaddr - 8, (char *)&prev_insn, sizeof (prev_insn));
+ }
+
+ /* 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.code & 0xc1c00000) == 0x01000000
+ && prev_insn.rd == insn.rs1)
+ {
+ fprintf_filtered (stream, "\t! ");
+ /* We cannot trust the compiler to sign-extend
+ when extracting the bitfield, hence the shifts. */
+ print_address (((int) prev_insn.imm22 << 10)
+ | (insn.imm13 << 19) >> 19, stream);
+ }
+ }
+ }
+
+ return sizeof (insn);
+ }
+ }
+
+ printf_filtered ("%#8x", insn.code);
+ return sizeof (insn);
+}
+
+
+/* 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;
+ }
+
+ /* 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 the above aliases, two "identical" instructions had
+ better have the same opcode. This is a sanity check on the table. */
+ if (0 != strcmp (op0->name, op1->name))
+ 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;
+}