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- /* Print SPARC instructions.
- Copyright 1989, 1991, 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "opcode/sparc.h"
- #include "dis-asm.h"
- #include <string.h>
-
- 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",
- "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" };
-
- #define freg_names (®_names[4 * 8])
-
- /* FIXME--need to deal with byte order (probably using masking and
- shifting rather than bitfields is easiest). */
-
- 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
- } branch;
-
- #define imm22 disp22
- 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)
- 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;
- extern void qsort ();
-
- /* Print one instruction from MEMADDR on 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. */
- int
- print_insn_sparc (memaddr, info)
- bfd_vma memaddr;
- disassemble_info *info;
- {
- FILE *stream = info->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;
- }
-
- {
- int status =
- (*info->read_memory_func) (memaddr, (bfd_byte *) &insn, sizeof (insn), info);
- if (status != 0)
- {
- (*info->memory_error_func) (status, memaddr, info);
- return -1;
- }
- }
-
- 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 `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) */
- && 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;
-
- (*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");
- ++s;
- continue;
-
- 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 (insn.rs1);
- break;
-
- case '2':
- reg (insn.rs2);
- break;
-
- case 'd':
- reg (insn.rd);
- break;
- #undef reg
-
- #define freg(n) (*info->fprintf_func) (stream, "%%%s", freg_names[n])
- case 'e':
- case 'v': /* double/even */
- case 'V': /* quad/multiple of 4 */
- freg (insn.rs1);
- break;
-
- case 'f':
- case 'B': /* double/even */
- case 'R': /* quad/multiple of 4 */
- freg (insn.rs2);
- break;
-
- case 'g':
- case 'H': /* double/even */
- case 'J': /* quad/multiple of 4 */
- freg (insn.rd);
- break;
- #undef freg
-
- #define creg(n) (*info->fprintf_func) (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':
- (*info->fprintf_func) (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)
- (*info->fprintf_func) (stream, "%d", imm);
- else
- (*info->fprintf_func) (stream, "%#x", imm);
- }
- break;
-
-
- case 'M':
- (*info->fprintf_func) (stream, "%%asr%d", insn.rs1);
- break;
-
- case 'm':
- (*info->fprintf_func) (stream, "%%asr%d", insn.rd);
- break;
-
- case 'L':
- (*info->print_address_func)
- ((bfd_vma) memaddr + insn.disp30 * 4,
- info);
- break;
-
- case 'l':
- if ((insn.code >> 22) == 0)
- /* Special case for `unimp'. Don't try to turn
- it's operand into a function offset. */
- (*info->fprintf_func)
- (stream, "%#x",
- (int) (((int) insn.disp22 << 10) >> 10));
- else
- /* We cannot trust the compiler to sign-extend
- when extracting the bitfield, hence the shifts. */
- (*info->print_address_func)
- ((bfd_vma) (memaddr
- + (((int) insn.disp22 << 10) >> 10) * 4),
- info);
- break;
-
- case 'A':
- (*info->fprintf_func) (stream, "(%d)", (int) insn.asi);
- 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 '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)
- {
- union sparc_insn prev_insn;
- int errcode;
-
- errcode =
- (*info->read_memory_func)
- (memaddr - 4,
- (bfd_byte *)&prev_insn, sizeof (prev_insn), info);
-
- 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, (bfd_byte *)&prev_insn, sizeof (prev_insn),
- info);
- }
-
- /* 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)
- {
- (*info->fprintf_func) (stream, "\t! ");
- /* We cannot trust the compiler to sign-extend
- when extracting the bitfield, hence the shifts. */
- (*info->print_address_func)
- (((int) prev_insn.imm22 << 10)
- | (insn.imm13 << 19) >> 19,
- info);
- }
- }
- }
-
- return sizeof (insn);
- }
- }
-
- (*info->fprintf_func) (stream, "%#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 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;
- }
-