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Diffstat (limited to 'gdb/ns32k-pinsn.c')
| -rw-r--r-- | gdb/ns32k-pinsn.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/gdb/ns32k-pinsn.c b/gdb/ns32k-pinsn.c new file mode 100644 index 0000000..7afee48 --- /dev/null +++ b/gdb/ns32k-pinsn.c @@ -0,0 +1,437 @@ +/* Print 32000 instructions for GDB, the GNU debugger. + Copyright (C) 1986 Free Software Foundation, Inc. + +GDB is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY. No author or distributor accepts responsibility to anyone +for the consequences of using it or for whether it serves any +particular purpose or works at all, unless he says so in writing. +Refer to the GDB General Public License for full details. + +Everyone is granted permission to copy, modify and redistribute GDB, +but only under the conditions described in the GDB General Public +License. A copy of this license is supposed to have been given to you +along with GDB so you can know your rights and responsibilities. It +should be in a file named COPYING. Among other things, the copyright +notice and this notice must be preserved on all copies. + +In other words, go ahead and share GDB, but don't try to stop +anyone else from sharing it farther. Help stamp out software hoarding! +*/ + +#include <stdio.h> + +#include "defs.h" +#include "param.h" +#include "symtab.h" +#include "ns32k-opcode.h" + +/* 32000 instructions are never longer than this. */ +#define MAXLEN 62 + +/* Number of elements in the opcode table. */ +#define NOPCODES (sizeof notstrs / sizeof notstrs[0]) + +extern char *reg_names[]; + +#define NEXT_IS_ADDR '|' + +/* + * extract "count" bits starting "offset" bits + * into buffer + */ + +int +bit_extract (buffer, offset, count) + char *buffer; + int offset; + int count; +{ + int result; + int mask; + int bit; + + buffer += offset >> 3; + offset &= 7; + bit = 1; + result = 0; + while (count--) + { + if ((*buffer & (1 << offset))) + result |= bit; + if (++offset == 8) + { + offset = 0; + buffer++; + } + bit <<= 1; + } + return result; +} + +double +dbit_extract (buffer, offset, count) +{ + union { + struct {int low, high; } ival; + double dval; + } foo; + + foo.ival.low = bit_extract (buffer, offset, 32); + foo.ival.high = bit_extract (buffer, offset+32, 32); + return foo.dval; +} + +sign_extend (value, bits) +{ + value = value & ((1 << bits) - 1); + return (value & (1 << (bits-1)) + ? value | (~((1 << bits) - 1)) + : value); +} + +flip_bytes (ptr, count) + char *ptr; + int count; +{ + char tmp; + + while (count > 0) + { + tmp = *ptr; + ptr[0] = ptr[count-1]; + ptr[count-1] = tmp; + ptr++; + count -= 2; + } +} + + +/* Print the 32000 instruction at address MEMADDR in debugged memory, + on STREAM. Returns length of the instruction, in bytes. */ + +int +print_insn (memaddr, stream) +CORE_ADDR memaddr; +FILE *stream; +{ + unsigned char buffer[MAXLEN]; + register int i; + register unsigned char *p; + register char *d; + unsigned short first_word; + int gen, disp; + int ioffset; /* bits into instruction */ + int aoffset; /* bits into arguments */ + char arg_bufs[MAX_ARGS+1][ARG_LEN]; + int argnum; + int maxarg; + + read_memory (memaddr, buffer, MAXLEN); + + first_word = *(unsigned short *) buffer; + for (i = 0; i < NOPCODES; i++) + if ((first_word & ((1 << notstrs[i].detail.obits) - 1)) + == notstrs[i].detail.code) + break; + + /* Handle undefined instructions. */ + if (i == NOPCODES) + { + fprintf (stream, "0%o", buffer[0]); + return 1; + } + + fprintf (stream, "%s", notstrs[i].name); + + ioffset = notstrs[i].detail.ibits; + aoffset = notstrs[i].detail.ibits; + d = notstrs[i].detail.args; + + if (*d) + { + fputc ('\t', stream); + + maxarg = 0; + while (*d) + { + argnum = *d - '1'; + d++; + if (argnum > maxarg && argnum < MAX_ARGS) + maxarg = argnum; + ioffset = print_insn_arg (*d, ioffset, &aoffset, buffer, + memaddr, arg_bufs[argnum]); + d++; + } + for (argnum = 0; argnum <= maxarg; argnum++) + { + CORE_ADDR addr; + char *ch, *index (); + for (ch = arg_bufs[argnum]; *ch;) + { + if (*ch == NEXT_IS_ADDR) + { + ++ch; + addr = atoi (ch); + print_address (addr, stream); + while (*ch && *ch != NEXT_IS_ADDR) + ++ch; + if (*ch) + ++ch; + } + else + putc (*ch++, stream); + } + if (argnum < maxarg) + fprintf (stream, ", "); + } + } + return aoffset / 8; +} + +print_insn_arg (d, ioffset, aoffsetp, buffer, addr, result) + char d; + int ioffset, *aoffsetp; + char *buffer; + CORE_ADDR addr; + char *result; +{ + int addr_mode; + float Fvalue; + double Lvalue; + int Ivalue; + int disp1, disp2; + int index; + + switch (d) + { + case 'F': + case 'L': + case 'B': + case 'W': + case 'D': + case 'A': + addr_mode = bit_extract (buffer, ioffset-5, 5); + ioffset -= 5; + switch (addr_mode) + { + case 0x0: case 0x1: case 0x2: case 0x3: + case 0x4: case 0x5: case 0x6: case 0x7: + sprintf (result, "r%d", addr_mode); + break; + case 0x8: case 0x9: case 0xa: case 0xb: + case 0xc: case 0xd: case 0xe: case 0xf: + disp1 = get_displacement (buffer, aoffsetp); + sprintf (result, "%d(r%d)", disp1, addr_mode & 7); + break; + case 0x10: + case 0x11: + case 0x12: + disp1 = get_displacement (buffer, aoffsetp); + disp2 = get_displacement (buffer, aoffsetp); + sprintf (result, "%d(%d(%s))", disp2, disp1, + addr_mode==0x10?"fp":addr_mode==0x11?"sp":"sb"); + break; + case 0x13: + sprintf (result, "reserved"); + break; + case 0x14: + switch (d) + { + case 'B': + Ivalue = bit_extract (buffer, *aoffsetp, 8); + Ivalue = sign_extend (Ivalue, 8); + *aoffsetp += 8; + sprintf (result, "$%d", Ivalue); + break; + case 'W': + Ivalue = bit_extract (buffer, *aoffsetp, 16); + flip_bytes (&Ivalue, 2); + *aoffsetp += 16; + Ivalue = sign_extend (Ivalue, 16); + sprintf (result, "$%d", Ivalue); + break; + case 'D': + Ivalue = bit_extract (buffer, *aoffsetp, 32); + flip_bytes (&Ivalue, 4); + *aoffsetp += 32; + sprintf (result, "$%d", Ivalue); + break; + case 'A': + Ivalue = bit_extract (buffer, *aoffsetp, 32); + flip_bytes (&Ivalue, 4); + *aoffsetp += 32; + sprintf (result, "$|%d|", Ivalue); + break; + case 'F': + Fvalue = (float) bit_extract (buffer, *aoffsetp, 32); + flip_bytes (&Fvalue, 4); + *aoffsetp += 32; + sprintf (result, "$%g", Fvalue); + break; + case 'L': + Lvalue = dbit_extract (buffer, *aoffsetp, 64); + flip_bytes (&Lvalue, 8); + *aoffsetp += 64; + sprintf (result, "$%g", Lvalue); + break; + } + break; + case 0x15: + disp1 = get_displacement (buffer, aoffsetp); + sprintf (result, "@|%d|", disp1); + break; + case 0x16: + disp1 = get_displacement (buffer, aoffsetp); + disp2 = get_displacement (buffer, aoffsetp); + sprintf (result, "EXT(%d) + %d", disp1, disp2); + break; + case 0x17: + sprintf (result, "tos"); + break; + case 0x18: + disp1 = get_displacement (buffer, aoffsetp); + sprintf (result, "%d(fp)", disp1); + break; + case 0x19: + disp1 = get_displacement (buffer, aoffsetp); + sprintf (result, "%d(sp)", disp1); + break; + case 0x1a: + disp1 = get_displacement (buffer, aoffsetp); + sprintf (result, "%d(sb)", disp1); + break; + case 0x1b: + disp1 = get_displacement (buffer, aoffsetp); + sprintf (result, "|%d|", addr + disp1); + break; + case 0x1c: + case 0x1d: + case 0x1e: + case 0x1f: + index = bit_extract (buffer, *aoffsetp, 8); + *aoffsetp += 8; + print_insn_arg (d, *aoffsetp, aoffsetp, buffer, addr, + result); + { + static char *ind[] = {"b", "w", "d", "q"}; + char *off; + + off = result + strlen (result); + sprintf (off, "[r%d:%s]", index & 7, + ind[addr_mode & 3]); + } + break; + } + break; + case 'q': + Ivalue = bit_extract (buffer, ioffset-4, 4); + Ivalue = sign_extend (Ivalue, 4); + sprintf (result, "%d", Ivalue); + ioffset -= 4; + break; + case 'r': + Ivalue = bit_extract (buffer, ioffset-3, 3); + sprintf (result, "r%d", Ivalue&7); + ioffset -= 3; + break; + case 'd': + sprintf (result, "%d", get_displacement (buffer, aoffsetp)); + break; + case 'p': + sprintf (result, "%c%d%c", NEXT_IS_ADDR, + addr + get_displacement (buffer, aoffsetp), + NEXT_IS_ADDR); + break; + case 'i': + Ivalue = bit_extract (buffer, *aoffsetp, 8); + *aoffsetp += 8; + sprintf (result, "0x%x", Ivalue); + break; + } + return ioffset; +} + +get_displacement (buffer, aoffsetp) + char *buffer; + int *aoffsetp; +{ + int Ivalue; + + Ivalue = bit_extract (buffer, *aoffsetp, 8); + switch (Ivalue & 0xc0) + { + case 0x00: + case 0x40: + Ivalue = sign_extend (Ivalue, 7); + *aoffsetp += 8; + break; + case 0x80: + Ivalue = bit_extract (buffer, *aoffsetp, 16); + flip_bytes (&Ivalue, 2); + Ivalue = sign_extend (Ivalue, 14); + *aoffsetp += 16; + break; + case 0xc0: + Ivalue = bit_extract (buffer, *aoffsetp, 32); + flip_bytes (&Ivalue, 4); + Ivalue = sign_extend (Ivalue, 30); + *aoffsetp += 32; + break; + } + return Ivalue; +} + +/* Return the number of locals in the current frame given a pc + pointing to the enter instruction. This is used in the macro + FRAME_FIND_SAVED_REGS. */ + +ns32k_localcount (enter_pc) + CORE_ADDR enter_pc; +{ + unsigned char localtype; + int localcount; + + localtype = read_memory_integer (enter_pc+2, 1); + if ((localtype & 0x80) == 0) + localcount = localtype; + else if ((localtype & 0xc0) == 0x80) + localcount = (((localtype & 0x3f) << 8) + | (read_memory_integer (enter_pc+3, 1) & 0xff)); + else + localcount = (((localtype & 0x3f) << 24) + | ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16) + | ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 ) + | (read_memory_integer (enter_pc+5, 1) & 0xff)); + return localcount; +} + +/* + * Get the address of the enter opcode for the function + * containing PC, if there is an enter for the function, + * and if the pc is between the enter and exit. + * Returns positive address if pc is between enter/exit, + * 1 if pc before enter or after exit, 0 otherwise. + */ + +CORE_ADDR +n32k_get_enter_addr (pc) + CORE_ADDR pc; +{ + CORE_ADDR enter_addr; + unsigned char op; + + if (ABOUT_TO_RETURN (pc)) + return 1; /* after exit */ + + enter_addr = get_pc_function_start (pc); + + if (pc == enter_addr) + return 1; /* before enter */ + + op = read_memory_integer (enter_addr, 1); + + if (op != 0x82) + return 0; /* function has no enter/exit */ + + return enter_addr; /* pc is between enter and exit */ +} |