453 lines
13 KiB
C
453 lines
13 KiB
C
/* Pyramid target-dependent code for GDB.
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Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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/*** Prettier register printing. ***/
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/* Print registers in the same format as pyramid's dbx, adb, sdb. */
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pyr_print_registers(reg_buf, regnum)
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long *reg_buf[];
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{
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register int regno;
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int usp, ksp;
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struct user u;
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for (regno = 0; regno < 16; regno++) {
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printf_unfiltered/*_filtered*/ ("%6.6s: %8x %6.6s: %8x %6s: %8x %6s: %8x\n",
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reg_names[regno], reg_buf[regno],
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reg_names[regno+16], reg_buf[regno+16],
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reg_names[regno+32], reg_buf[regno+32],
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reg_names[regno+48], reg_buf[regno+48]);
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}
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usp = ptrace (3, inferior_pid,
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(PTRACE_ARG3_TYPE) ((char *)&u.u_pcb.pcb_usp) -
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((char *)&u), 0);
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ksp = ptrace (3, inferior_pid,
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(PTRACE_ARG3_TYPE) ((char *)&u.u_pcb.pcb_ksp) -
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((char *)&u), 0);
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printf_unfiltered/*_filtered*/ ("\n%6.6s: %8x %6.6s: %8x (%08x) %6.6s %8x\n",
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reg_names[CSP_REGNUM],reg_buf[CSP_REGNUM],
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reg_names[KSP_REGNUM], reg_buf[KSP_REGNUM], ksp,
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"usp", usp);
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}
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/* Print the register regnum, or all registers if regnum is -1.
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fpregs is currently ignored. */
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pyr_do_registers_info (regnum, fpregs)
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int regnum;
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int fpregs;
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{
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/* On a pyr, we know a virtual register can always fit in an long.
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Here (and elsewhere) we take advantage of that. Yuk. */
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long raw_regs[MAX_REGISTER_RAW_SIZE*NUM_REGS];
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register int i;
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for (i = 0 ; i < 64 ; i++) {
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read_relative_register_raw_bytes(i, raw_regs+i);
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}
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if (regnum == -1)
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pyr_print_registers (raw_regs, regnum);
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else
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for (i = 0; i < NUM_REGS; i++)
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if (i == regnum) {
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long val = raw_regs[i];
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fputs_filtered (reg_names[i], stdout);
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printf_filtered(":");
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print_spaces_filtered (6 - strlen (reg_names[i]), stdout);
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if (val == 0)
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printf_filtered ("0");
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else
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printf_filtered ("%s %d", local_hex_string_custom(val,"08"), val);
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printf_filtered("\n");
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}
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}
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/*** Debugging editions of various macros from m-pyr.h ****/
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CORE_ADDR frame_locals_address (frame)
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struct frame_info *frame;
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{
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register int addr = find_saved_register (frame,CFP_REGNUM);
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register int result = read_memory_integer (addr, 4);
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#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
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fprintf_unfiltered (stderr,
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"\t[[..frame_locals:%8x, %s= %x @%x fcfp= %x foo= %x\n\t gr13=%x pr13=%x tr13=%x @%x]]\n",
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frame->frame,
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reg_names[CFP_REGNUM],
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result, addr,
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frame->frame_cfp, (CFP_REGNUM),
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read_register(13), read_register(29), read_register(61),
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find_saved_register(frame, 61));
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#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
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/* FIXME: I thought read_register (CFP_REGNUM) should be the right answer;
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or at least CFP_REGNUM relative to FRAME (ie, result).
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There seems to be a bug in the way the innermost frame is set up. */
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return ((frame->next) ? result: frame->frame_cfp);
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}
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CORE_ADDR frame_args_addr (frame)
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struct frame_info *frame;
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{
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register int addr = find_saved_register (frame,CFP_REGNUM);
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register int result = read_memory_integer (addr, 4);
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#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
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fprintf_unfiltered (stderr,
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"\t[[..frame_args:%8x, %s= %x @%x fcfp= %x r_r= %x\n\t gr13=%x pr13=%x tr13=%x @%x]]\n",
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frame->frame,
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reg_names[CFP_REGNUM],
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result, addr,
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frame->frame_cfp, read_register(CFP_REGNUM),
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read_register(13), read_register(29), read_register(61),
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find_saved_register(frame, 61));
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#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
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/* FIXME: I thought read_register (CFP_REGNUM) should be the right answer;
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or at least CFP_REGNUM relative to FRAME (ie, result).
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There seems to be a bug in the way the innermost frame is set up. */
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return ((frame->next) ? result: frame->frame_cfp);
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}
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#include "symtab.h"
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#include "opcode/pyr.h"
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#include "gdbcore.h"
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/* A couple of functions used for debugging frame-handling on
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Pyramids. (The Pyramid-dependent handling of register values for
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windowed registers is known to be buggy.)
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When debugging, these functions can supplant the normal definitions of some
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of the macros in tm-pyramid.h The quantity of information produced
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when these functions are used makes the gdb unusable as a
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debugger for user programs. */
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extern unsigned pyr_saved_pc(), pyr_frame_chain();
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CORE_ADDR pyr_frame_chain(frame)
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CORE_ADDR frame;
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{
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int foo=frame - CONTROL_STACK_FRAME_SIZE;
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/* printf_unfiltered ("...following chain from %x: got %x\n", frame, foo);*/
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return foo;
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}
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CORE_ADDR pyr_saved_pc(frame)
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CORE_ADDR frame;
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{
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int foo=0;
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foo = read_memory_integer (((CORE_ADDR)(frame))+60, 4);
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printf_unfiltered ("..reading pc from frame 0x%0x+%d regs: got %0x\n",
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frame, 60/4, foo);
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return foo;
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}
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/* Pyramid instructions are never longer than this many bytes. */
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#define MAXLEN 24
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/* Number of elements in the opcode table. */
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/*const*/ static int nopcodes = (sizeof (pyr_opcodes) / sizeof( pyr_opcodes[0]));
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#define NOPCODES (nopcodes)
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/* Let's be byte-independent so we can use this as a cross-assembler. */
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#define NEXTLONG(p) \
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(p += 4, (((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])
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/* Print one instruction at address MEMADDR in debugged memory,
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on STREAM. Returns length of the instruction, in bytes. */
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int
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pyr_print_insn (memaddr, stream)
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CORE_ADDR memaddr;
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FILE *stream;
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{
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unsigned char buffer[MAXLEN];
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register int i, nargs, insn_size =4;
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register unsigned char *p;
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register char *d;
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register int insn_opcode, operand_mode;
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register int index_multiplier, index_reg_regno, op_1_regno, op_2_regno ;
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long insn; /* first word of the insn, not broken down. */
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pyr_insn_format insn_decode; /* the same, broken out into op{code,erands} */
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long extra_1, extra_2;
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read_memory (memaddr, buffer, MAXLEN);
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insn_decode = *((pyr_insn_format *) buffer);
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insn = * ((int *) buffer);
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insn_opcode = insn_decode.operator;
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operand_mode = insn_decode.mode;
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index_multiplier = insn_decode.index_scale;
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index_reg_regno = insn_decode.index_reg;
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op_1_regno = insn_decode.operand_1;
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op_2_regno = insn_decode.operand_2;
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if (*((int *)buffer) == 0x0) {
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/* "halt" looks just like an invalid "jump" to the insn decoder,
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so is dealt with as a special case */
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fprintf_unfiltered (stream, "halt");
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return (4);
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}
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for (i = 0; i < NOPCODES; i++)
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if (pyr_opcodes[i].datum.code == insn_opcode)
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break;
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if (i == NOPCODES)
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/* FIXME: Handle unrecognised instructions better. */
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fprintf_unfiltered (stream, "???\t#%08x\t(op=%x mode =%x)",
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insn, insn_decode.operator, insn_decode.mode);
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else
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{
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/* Print the mnemonic for the instruction. Pyramid insn operands
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are so regular that we can deal with almost all of them
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separately.
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Unconditional branches are an exception: they are encoded as
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conditional branches (branch if false condition, I think)
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with no condition specified. The average user will not be
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aware of this. To maintain their illusion that an
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unconditional branch insn exists, we will have to FIXME to
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treat the insn mnemnonic of all branch instructions here as a
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special case: check the operands of branch insn and print an
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appropriate mnemonic. */
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fprintf_unfiltered (stream, "%s\t", pyr_opcodes[i].name);
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/* Print the operands of the insn (as specified in
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insn.operand_mode).
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Branch operands of branches are a special case: they are a word
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offset, not a byte offset. */
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if (insn_decode.operator == 0x01 || insn_decode.operator == 0x02) {
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register int bit_codes=(insn >> 16)&0xf;
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register int i;
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register int displacement = (insn & 0x0000ffff) << 2;
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static char cc_bit_names[] = "cvzn"; /* z,n,c,v: strange order? */
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/* Is bfc and no bits specified an unconditional branch?*/
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for (i=0;i<4;i++) {
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if ((bit_codes) & 0x1)
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fputc_unfiltered (cc_bit_names[i], stream);
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bit_codes >>= 1;
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}
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fprintf_unfiltered (stream, ",%0x",
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displacement + memaddr);
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return (insn_size);
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}
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switch (operand_mode) {
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case 0:
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fprintf_unfiltered (stream, "%s,%s",
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reg_names [op_1_regno],
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reg_names [op_2_regno]);
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break;
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case 1:
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fprintf_unfiltered (stream, " 0x%0x,%s",
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op_1_regno,
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reg_names [op_2_regno]);
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break;
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case 2:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream, " $0x%0x,%s",
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extra_1,
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reg_names [op_2_regno]);
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break;
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case 3:
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fprintf_unfiltered (stream, " (%s),%s",
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reg_names [op_1_regno],
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reg_names [op_2_regno]);
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break;
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case 4:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream, " 0x%0x(%s),%s",
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extra_1,
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reg_names [op_1_regno],
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reg_names [op_2_regno]);
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break;
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/* S1 destination mode */
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case 5:
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fprintf_unfiltered (stream,
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((index_reg_regno) ? "%s,(%s)[%s*%1d]" : "%s,(%s)"),
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reg_names [op_1_regno],
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 6:
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fprintf_unfiltered (stream,
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((index_reg_regno) ? " $%#0x,(%s)[%s*%1d]"
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: " $%#0x,(%s)"),
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op_1_regno,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 7:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno) ? " $%#0x,(%s)[%s*%1d]"
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: " $%#0x,(%s)"),
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extra_1,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 8:
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fprintf_unfiltered (stream,
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((index_reg_regno) ? " (%s),(%s)[%s*%1d]" : " (%s),(%s)"),
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reg_names [op_1_regno],
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 9:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno)
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? "%#0x(%s),(%s)[%s*%1d]"
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: "%#0x(%s),(%s)"),
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extra_1,
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reg_names [op_1_regno],
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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/* S2 destination mode */
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case 10:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno) ? "%s,%#0x(%s)[%s*%1d]" : "%s,%#0x(%s)"),
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reg_names [op_1_regno],
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extra_1,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 11:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno) ?
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" $%#0x,%#0x(%s)[%s*%1d]" : " $%#0x,%#0x(%s)"),
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op_1_regno,
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extra_1,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 12:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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read_memory (memaddr+8, buffer, MAXLEN);
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insn_size += 4;
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extra_2 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno) ?
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" $%#0x,%#0x(%s)[%s*%1d]" : " $%#0x,%#0x(%s)"),
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extra_1,
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extra_2,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 13:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno)
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? " (%s),%#0x(%s)[%s*%1d]"
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: " (%s),%#0x(%s)"),
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reg_names [op_1_regno],
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extra_1,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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case 14:
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read_memory (memaddr+4, buffer, MAXLEN);
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insn_size += 4;
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extra_1 = * ((int *) buffer);
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read_memory (memaddr+8, buffer, MAXLEN);
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insn_size += 4;
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extra_2 = * ((int *) buffer);
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fprintf_unfiltered (stream,
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((index_reg_regno) ? "%#0x(%s),%#0x(%s)[%s*%1d]"
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: "%#0x(%s),%#0x(%s) "),
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extra_1,
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reg_names [op_1_regno],
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extra_2,
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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break;
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default:
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fprintf_unfiltered (stream,
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((index_reg_regno) ? "%s,%s [%s*%1d]" : "%s,%s"),
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reg_names [op_1_regno],
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reg_names [op_2_regno],
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reg_names [index_reg_regno],
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index_multiplier);
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fprintf_unfiltered (stream,
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"\t\t# unknown mode in %08x",
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insn);
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break;
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} /* switch */
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}
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{
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return insn_size;
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}
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abort ();
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}
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