/* Print SPARC instructions. Copyright (C) 1989, 91-93, 1995, 1996 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> /* Bitmask of v9 architectures. */ #define MASK_V9 ((1 << SPARC_OPCODE_ARCH_V9) \ | (1 << SPARC_OPCODE_ARCH_V9A)) /* 1 if INSN is for v9 only. */ #define V9_ONLY_P(insn) (! ((insn)->architecture & ~MASK_V9)) /* 1 if INSN is for v9. */ #define V9_P(insn) (((insn)->architecture & MASK_V9) != 0) /* 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", "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. */ "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" }; #define freg_names (®_names[4 * 8]) /* 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 */ }; /* 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) /* These are for v9. */ #define X_DISP16(i) (((((i) >> 20) & 3) << 14) | (((i) >> 0) & 0x3fff)) #define X_DISP19(i) (((i) >> 0) & 0x7ffff) #define X_MEMBAR(i) ((i) & 0x7f) /* 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; 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; 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; } /* extern void qsort (); */ static int compare_opcodes (); /* Records current mask of SPARC_OPCODE_ARCH_FOO values, used to pass value to compare_opcodes. */ static unsigned int current_arch_mask; static int compute_arch_mask (); /* 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. */ int print_insn_sparc (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; /* Nonzero of opcode table has been initialized. */ static int opcodes_initialized = 0; /* bfd mach number of last call. */ static unsigned long current_mach = 0; if (!opcodes_initialized || info->mach != current_mach) { current_arch_mask = compute_arch_mask (info->mach); qsort ((char *) sparc_opcodes, sparc_num_opcodes, sizeof (sparc_opcodes[0]), compare_opcodes); build_hash_table (sparc_opcodes, opcode_hash_table, sparc_num_opcodes); current_mach = info->mach; 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 the insn isn't supported by the current architecture, skip it. */ if (! (opcode->architecture & current_arch_mask)) continue; 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; if (X_RS2 (insn) != X_RD (insn) && strchr (opcode->args, 'O') != 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; case 'N': (*info->fprintf_func) (stream, "pn"); ++s; continue; case 'T': (*info->fprintf_func) (stream, "pt"); ++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 (X_RS1 (insn)); break; case '2': case 'O': 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; 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': { int mask = X_MEMBAR (insn); int bit = 0x40, printed_one = 0; char *name; if (mask == 0) (info->fprintf_func) (stream, "0"); else while (bit) { if (mask & bit) { if (printed_one) (info->fprintf_func) (stream, "|"); name = sparc_decode_membar (bit); (info->fprintf_func) (stream, "%s", name); printed_one = 1; } bit >>= 1; } 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_DISP19 (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; case '*': { char *name = sparc_decode_prefetch (X_RD (insn)); if (name) (*info->fprintf_func) (stream, "%s", name); else (*info->fprintf_func) (stream, "%d", X_RD (insn)); break; } 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 + SEX (X_DISP30 (insn), 30) * 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': { char *name = sparc_decode_asi (X_ASI (insn)); if (name) (*info->fprintf_func) (stream, "%s", name); else (*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; case 'u': case 'U': { int val = *s == 'U' ? X_RS1 (insn) : X_RD (insn); char *name = sparc_decode_sparclet_cpreg (val); if (name) (*info->fprintf_func) (stream, "%s", name); else (*info->fprintf_func) (stream, "%%cpreg(%d)", val); 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, "unknown"); return sizeof (buffer); } /* Given BFD mach number, return a mask of SPARC_OPCODE_ARCH_FOO values. */ static int compute_arch_mask (mach) unsigned long mach; { switch (mach) { case 0 : case bfd_mach_sparc : return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V8); case bfd_mach_sparc_sparclet : return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_SPARCLET); case bfd_mach_sparc_sparclite : /* sparclites insns are recognized by default (because that's how they've always been treated, for better or worse). Kludge this by indicating generic v8 is also selected. */ return (SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_SPARCLITE) | SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V8)); case bfd_mach_sparc_v8plus : case bfd_mach_sparc_v9 : return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9); case bfd_mach_sparc_v8plusa : case bfd_mach_sparc_v9a : return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9A); } abort (); } /* 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 one (and only one) insn isn't supported by the current architecture, prefer the one that is. If neither are supported, but they're both for the same architecture, continue processing. Otherwise (both unsupported and for different architectures), prefer lower numbered arch's (fudged by comparing the bitmasks). */ if (op0->architecture & current_arch_mask) { if (! (op1->architecture & current_arch_mask)) return -1; } else { if (op1->architecture & current_arch_mask) return 1; else if (op0->architecture != op1->architecture) return op0->architecture - op1->architecture; } /* 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; } } /* Put 1,i before i,1. */ { int i0 = strncmp (op0->args, "i,1", 3) == 0; int i1 = strncmp (op1->args, "i,1", 3) == 0; if (i0 ^ i1) return i0 - i1; } /* 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 }