693 lines
22 KiB
C
693 lines
22 KiB
C
/* Work with core dump and executable files, for GDB on MIPS.
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This code would be in core.c if it weren't machine-dependent. */
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/* Low level interface to ptrace, for GDB when running under Unix.
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Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
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Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
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and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* FIXME: Can a MIPS porter/tester determine which of these include
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files we still need? -- gnu@cygnus.com */
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#include <stdio.h>
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#ifdef sgi
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#include <sys/inst.h>
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#else
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#include <mips/inst.h>
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#endif
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#include "defs.h"
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#include "param.h"
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#include "frame.h"
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#include "inferior.h"
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#include "symtab.h"
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#include "value.h"
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#include "gdbcmd.h"
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#include "language.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include "gdbcore.h"
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#ifndef MIPSMAGIC
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#ifdef MIPSEL
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#define MIPSMAGIC MIPSELMAGIC
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#else
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#define MIPSMAGIC MIPSEBMAGIC
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#endif
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#endif
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#define VM_MIN_ADDRESS (unsigned)0x400000
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#include <sys/user.h> /* After a.out.h */
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#include <sys/file.h>
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#include <sys/stat.h>
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#define PROC_LOW_ADDR(proc) ((proc)->adr) /* least address */
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#define PROC_HIGH_ADDR(proc) ((proc)->pad2) /* upper address bound */
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#define PROC_FRAME_OFFSET(proc) ((proc)->framesize)
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#define PROC_FRAME_REG(proc) ((proc)->framereg)
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#define PROC_REG_MASK(proc) ((proc)->regmask)
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#define PROC_FREG_MASK(proc) ((proc)->fregmask)
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#define PROC_REG_OFFSET(proc) ((proc)->regoffset)
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#define PROC_FREG_OFFSET(proc) ((proc)->fregoffset)
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#define PROC_PC_REG(proc) ((proc)->pcreg)
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#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->isym)
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#define _PROC_MAGIC_ 0x0F0F0F0F
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#define PROC_DESC_IS_DUMMY(proc) ((proc)->isym == _PROC_MAGIC_)
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#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->isym = _PROC_MAGIC_)
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struct linked_proc_info
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{
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struct mips_extra_func_info info;
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struct linked_proc_info *next;
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} * linked_proc_desc_table = NULL;
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#define READ_FRAME_REG(fi, regno) read_next_frame_reg((fi)->next, regno)
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int
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read_next_frame_reg(fi, regno)
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FRAME fi;
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int regno;
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{
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#define SIGFRAME_BASE sizeof(struct sigcontext)
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#define SIGFRAME_PC_OFF (-SIGFRAME_BASE+ 2*sizeof(int))
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#define SIGFRAME_SP_OFF (-SIGFRAME_BASE+32*sizeof(int))
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#define SIGFRAME_RA_OFF (-SIGFRAME_BASE+34*sizeof(int))
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for (; fi; fi = fi->next)
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if (in_sigtramp(fi->pc, 0)) {
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/* No idea if this code works. --PB. */
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int offset;
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if (regno == PC_REGNUM) offset = SIGFRAME_PC_OFF;
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else if (regno == RA_REGNUM) offset = SIGFRAME_RA_OFF;
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else if (regno == SP_REGNUM) offset = SIGFRAME_SP_OFF;
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else return 0;
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return read_memory_integer(fi->frame + offset, 4);
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}
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else if (regno == SP_REGNUM) return fi->frame;
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else if (fi->saved_regs->regs[regno])
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return read_memory_integer(fi->saved_regs->regs[regno], 4);
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return read_register(regno);
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}
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int
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mips_frame_saved_pc(frame)
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FRAME frame;
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{
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mips_extra_func_info_t proc_desc = (mips_extra_func_info_t)frame->proc_desc;
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int pcreg = proc_desc ? PROC_PC_REG(proc_desc) : RA_REGNUM;
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if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
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return read_memory_integer(frame->frame - 4, 4);
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#if 0
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/* If in the procedure prologue, RA_REGNUM might not have been saved yet.
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* Assume non-leaf functions start with:
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* addiu $sp,$sp,-frame_size
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* sw $ra,ra_offset($sp)
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* This if the pc is pointing at either of these instructions,
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* then $ra hasn't been trashed.
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* If the pc has advanced beyond these two instructions,
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* then $ra has been saved.
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* critical, and much more complex. Handling $ra is enough to get
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* a stack trace, but some register values with be wrong.
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*/
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if (frame->proc_desc && frame->pc < PROC_LOW_ADDR(proc_desc) + 8)
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return read_register(pcreg);
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#endif
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return read_next_frame_reg(frame, pcreg);
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}
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static struct mips_extra_func_info temp_proc_desc;
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static struct frame_saved_regs temp_saved_regs;
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CORE_ADDR heuristic_proc_start(pc)
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CORE_ADDR pc;
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{
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CORE_ADDR start_pc = pc;
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CORE_ADDR fence = start_pc - 10000;
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if (fence < VM_MIN_ADDRESS) fence = VM_MIN_ADDRESS;
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/* search back for previous return */
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for (start_pc -= 4; ; start_pc -= 4)
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if (start_pc < fence) return 0;
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else if (ABOUT_TO_RETURN(start_pc))
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break;
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start_pc += 8; /* skip return, and its delay slot */
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#if 0
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/* skip nops (usually 1) 0 - is this */
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while (start_pc < pc && read_memory_integer (start_pc, 4) == 0)
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start_pc += 4;
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#endif
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return start_pc;
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}
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mips_extra_func_info_t
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heuristic_proc_desc(start_pc, limit_pc, next_frame)
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CORE_ADDR start_pc, limit_pc;
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FRAME next_frame;
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{
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CORE_ADDR sp = next_frame ? next_frame->frame : read_register (SP_REGNUM);
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CORE_ADDR cur_pc;
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int frame_size;
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int has_frame_reg = 0;
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int reg30; /* Value of $r30. Used by gcc for frame-pointer */
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unsigned long reg_mask = 0;
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if (start_pc == 0) return NULL;
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bzero(&temp_proc_desc, sizeof(temp_proc_desc));
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bzero(&temp_saved_regs, sizeof(struct frame_saved_regs));
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if (start_pc + 200 < limit_pc) limit_pc = start_pc + 200;
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restart:
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frame_size = 0;
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for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4) {
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unsigned long word;
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int status;
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status = read_memory_nobpt (cur_pc, &word, 4);
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if (status) memory_error (status, cur_pc);
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if ((word & 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
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frame_size += (-word) & 0xFFFF;
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else if ((word & 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
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frame_size += (-word) & 0xFFFF;
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else if ((word & 0xFFE00000) == 0xafa00000) { /* sw reg,offset($sp) */
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int reg = (word & 0x001F0000) >> 16;
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reg_mask |= 1 << reg;
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temp_saved_regs.regs[reg] = sp + (short)word;
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}
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else if ((word & 0xFFFF0000) == 0x27be0000) { /* addiu $30,$sp,size */
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if ((unsigned short)word != frame_size)
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reg30 = sp + (unsigned short)word;
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else if (!has_frame_reg) {
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int alloca_adjust;
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has_frame_reg = 1;
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reg30 = read_next_frame_reg(next_frame, 30);
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alloca_adjust = reg30 - (sp + (unsigned short)word);
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if (alloca_adjust > 0) {
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/* FP > SP + frame_size. This may be because
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/* of an alloca or somethings similar.
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* Fix sp to "pre-alloca" value, and try again.
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*/
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sp += alloca_adjust;
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goto restart;
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}
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}
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}
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else if ((word & 0xFFE00000) == 0xafc00000) { /* sw reg,offset($30) */
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int reg = (word & 0x001F0000) >> 16;
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reg_mask |= 1 << reg;
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temp_saved_regs.regs[reg] = reg30 + (short)word;
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}
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}
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if (has_frame_reg) {
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PROC_FRAME_REG(&temp_proc_desc) = 30;
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PROC_FRAME_OFFSET(&temp_proc_desc) = 0;
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}
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else {
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PROC_FRAME_REG(&temp_proc_desc) = SP_REGNUM;
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PROC_FRAME_OFFSET(&temp_proc_desc) = frame_size;
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}
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PROC_REG_MASK(&temp_proc_desc) = reg_mask;
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PROC_PC_REG(&temp_proc_desc) = RA_REGNUM;
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return &temp_proc_desc;
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}
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mips_extra_func_info_t
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find_proc_desc(pc, next_frame)
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CORE_ADDR pc;
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FRAME next_frame;
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{
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mips_extra_func_info_t proc_desc;
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extern struct block *block_for_pc();
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struct block *b = block_for_pc(pc);
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struct symbol *sym =
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b ? lookup_symbol(".gdbinfo.", b, LABEL_NAMESPACE, 0, NULL) : NULL;
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if (sym != NULL)
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{
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/* IF this is the topmost frame AND
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* (this proc does not have debugging information OR
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* the PC is in the procedure prologue)
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* THEN create a "hueristic" proc_desc (by analyzing
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* the actual code) to replace the "official" proc_desc.
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*/
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proc_desc = (struct mips_extra_func_info *)sym->value.value;
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if (next_frame == NULL) {
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struct symtab_and_line val;
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struct symbol *proc_symbol =
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PROC_DESC_IS_DUMMY(proc_desc) ? 0 : PROC_SYMBOL(proc_desc);
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if (proc_symbol) {
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val = find_pc_line (BLOCK_START
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(SYMBOL_BLOCK_VALUE(proc_symbol)),
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0);
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val.pc = val.end ? val.end : pc;
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}
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if (!proc_symbol || pc < val.pc) {
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mips_extra_func_info_t found_heuristic =
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heuristic_proc_desc(PROC_LOW_ADDR(proc_desc),
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pc, next_frame);
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if (found_heuristic) proc_desc = found_heuristic;
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}
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}
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}
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else
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{
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register struct linked_proc_info *link;
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for (link = linked_proc_desc_table; link; link = link->next)
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if (PROC_LOW_ADDR(&link->info) <= pc
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&& PROC_HIGH_ADDR(&link->info) > pc)
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return &link->info;
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proc_desc =
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heuristic_proc_desc(heuristic_proc_start(pc), pc, next_frame);
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}
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return proc_desc;
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}
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mips_extra_func_info_t cached_proc_desc;
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FRAME_ADDR mips_frame_chain(frame)
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FRAME frame;
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{
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extern CORE_ADDR startup_file_start; /* From blockframe.c */
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mips_extra_func_info_t proc_desc;
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CORE_ADDR saved_pc = FRAME_SAVED_PC(frame);
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if (startup_file_start)
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{ /* has at least the __start symbol */
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if (saved_pc == 0 || !outside_startup_file (saved_pc)) return 0;
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}
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else
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{ /* This hack depends on the internals of __start. */
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/* We also assume the breakpoints are *not* inserted */
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if (saved_pc == 0
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|| read_memory_integer (saved_pc + 8, 4) & 0xFC00003F == 0xD)
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return 0; /* break */
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}
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proc_desc = find_proc_desc(saved_pc, frame);
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if (!proc_desc) return 0;
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cached_proc_desc = proc_desc;
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return read_next_frame_reg(frame, PROC_FRAME_REG(proc_desc))
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+ PROC_FRAME_OFFSET(proc_desc);
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}
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void
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init_extra_frame_info(fci)
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struct frame_info *fci;
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{
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extern struct obstack frame_cache_obstack;
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/* Use proc_desc calculated in frame_chain */
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mips_extra_func_info_t proc_desc = fci->next ? cached_proc_desc :
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find_proc_desc(fci->pc, fci->next);
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fci->saved_regs = (struct frame_saved_regs*)
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obstack_alloc (&frame_cache_obstack, sizeof(struct frame_saved_regs));
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bzero(fci->saved_regs, sizeof(struct frame_saved_regs));
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fci->proc_desc =
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proc_desc == &temp_proc_desc ? (char*)NULL : (char*)proc_desc;
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if (proc_desc)
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{
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int ireg;
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CORE_ADDR reg_position;
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unsigned long mask;
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/* r0 bit means kernel trap */
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int kernel_trap = PROC_REG_MASK(proc_desc) & 1;
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/* Fixup frame-pointer - only needed for top frame */
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/* This may not be quite right, if procedure has a real frame register */
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if (fci->pc == PROC_LOW_ADDR(proc_desc))
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fci->frame = read_register (SP_REGNUM);
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else
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fci->frame = READ_FRAME_REG(fci, PROC_FRAME_REG(proc_desc))
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+ PROC_FRAME_OFFSET(proc_desc);
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if (proc_desc == &temp_proc_desc)
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*fci->saved_regs = temp_saved_regs;
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else
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{
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/* find which general-purpose registers were saved */
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reg_position = fci->frame + PROC_REG_OFFSET(proc_desc);
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mask = kernel_trap ? 0xFFFFFFFF : PROC_REG_MASK(proc_desc);
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for (ireg= 31; mask; --ireg, mask <<= 1)
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if (mask & 0x80000000)
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{
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fci->saved_regs->regs[ireg] = reg_position;
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reg_position -= 4;
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}
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/* find which floating-point registers were saved */
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reg_position = fci->frame + PROC_FREG_OFFSET(proc_desc);
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/* The freg_offset points to where the first *double* register is saved.
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* So skip to the high-order word. */
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reg_position += 4;
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mask = kernel_trap ? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc);
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for (ireg = 31; mask; --ireg, mask <<= 1)
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if (mask & 0x80000000)
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{
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fci->saved_regs->regs[32+ireg] = reg_position;
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reg_position -= 4;
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}
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}
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/* hack: if argument regs are saved, guess these contain args */
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if ((PROC_REG_MASK(proc_desc) & 0xF0) == 0) fci->num_args = -1;
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else if ((PROC_REG_MASK(proc_desc) & 0x80) == 0) fci->num_args = 4;
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else if ((PROC_REG_MASK(proc_desc) & 0x40) == 0) fci->num_args = 3;
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else if ((PROC_REG_MASK(proc_desc) & 0x20) == 0) fci->num_args = 2;
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else if ((PROC_REG_MASK(proc_desc) & 0x10) == 0) fci->num_args = 1;
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fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
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}
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if (fci->next == 0)
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supply_register(FP_REGNUM, &fci->frame);
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}
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CORE_ADDR mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
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int nargs;
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value *args;
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CORE_ADDR sp;
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int struct_return;
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CORE_ADDR struct_addr;
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{
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CORE_ADDR buf;
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register i;
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int accumulate_size = struct_return ? 4 : 0;
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struct mips_arg { char *contents; int len; int offset; };
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struct mips_arg *mips_args =
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(struct mips_arg*)alloca(nargs * sizeof(struct mips_arg));
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register struct mips_arg *m_arg;
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for (i = 0, m_arg = mips_args; i < nargs; i++, m_arg++) {
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extern value value_arg_coerce();
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value arg = value_arg_coerce (args[i]);
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m_arg->len = TYPE_LENGTH (VALUE_TYPE (arg));
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/* This entire mips-specific routine is because doubles must be aligned
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* on 8-byte boundaries. It still isn't quite right, because MIPS decided
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* to align 'struct {int a, b}' on 4-byte boundaries (even though this
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* breaks their varargs implementation...). A correct solution
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* requires an simulation of gcc's 'alignof' (and use of 'alignof'
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* in stdarg.h/varargs.h).
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*/
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if (m_arg->len > 4) accumulate_size = (accumulate_size + 7) & -8;
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m_arg->offset = accumulate_size;
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accumulate_size = (accumulate_size + m_arg->len + 3) & -4;
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m_arg->contents = VALUE_CONTENTS(arg);
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}
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accumulate_size = (accumulate_size + 7) & (-8);
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if (accumulate_size < 16) accumulate_size = 16;
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sp -= accumulate_size;
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for (i = nargs; m_arg--, --i >= 0; )
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write_memory(sp + m_arg->offset, m_arg->contents, m_arg->len);
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if (struct_return) {
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buf = struct_addr;
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write_memory(sp, &buf, sizeof(CORE_ADDR));
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}
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return sp;
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}
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/* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
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#define MASK(i,j) ((1 << (j)+1)-1 ^ (1 << (i))-1)
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void
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mips_push_dummy_frame()
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{
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int ireg;
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struct linked_proc_info *link = (struct linked_proc_info*)
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xmalloc(sizeof(struct linked_proc_info));
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mips_extra_func_info_t proc_desc = &link->info;
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CORE_ADDR sp = read_register (SP_REGNUM);
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CORE_ADDR save_address;
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REGISTER_TYPE buffer;
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link->next = linked_proc_desc_table;
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linked_proc_desc_table = link;
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#define PUSH_FP_REGNUM 16 /* must be a register preserved across calls */
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#define GEN_REG_SAVE_MASK MASK(1,16)|MASK(24,28)|(1<<31)
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#define GEN_REG_SAVE_COUNT 22
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#define FLOAT_REG_SAVE_MASK MASK(0,19)
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#define FLOAT_REG_SAVE_COUNT 20
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#define SPECIAL_REG_SAVE_COUNT 4
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/*
|
||
* The registers we must save are all those not preserved across
|
||
* procedure calls. Dest_Reg (see tm-mips.h) must also be saved.
|
||
* In addition, we must save the PC, and PUSH_FP_REGNUM.
|
||
* (Ideally, we should also save MDLO/-HI and FP Control/Status reg.)
|
||
*
|
||
* Dummy frame layout:
|
||
* (high memory)
|
||
* Saved PC
|
||
* Saved MMHI, MMLO, FPC_CSR
|
||
* Saved R31
|
||
* Saved R28
|
||
* ...
|
||
* Saved R1
|
||
* Saved D18 (i.e. F19, F18)
|
||
* ...
|
||
* Saved D0 (i.e. F1, F0)
|
||
* CALL_DUMMY (subroutine stub; see m-mips.h)
|
||
* Parameter build area (not yet implemented)
|
||
* (low memory)
|
||
*/
|
||
PROC_REG_MASK(proc_desc) = GEN_REG_SAVE_MASK;
|
||
PROC_FREG_MASK(proc_desc) = FLOAT_REG_SAVE_MASK;
|
||
PROC_REG_OFFSET(proc_desc) = /* offset of (Saved R31) from FP */
|
||
-sizeof(long) - 4 * SPECIAL_REG_SAVE_COUNT;
|
||
PROC_FREG_OFFSET(proc_desc) = /* offset of (Saved D18) from FP */
|
||
-sizeof(double) - 4 * (SPECIAL_REG_SAVE_COUNT + GEN_REG_SAVE_COUNT);
|
||
/* save general registers */
|
||
save_address = sp + PROC_REG_OFFSET(proc_desc);
|
||
for (ireg = 32; --ireg >= 0; )
|
||
if (PROC_REG_MASK(proc_desc) & (1 << ireg))
|
||
{
|
||
buffer = read_register (ireg);
|
||
write_memory (save_address, &buffer, sizeof(REGISTER_TYPE));
|
||
save_address -= 4;
|
||
}
|
||
/* save floating-points registers */
|
||
save_address = sp + PROC_FREG_OFFSET(proc_desc);
|
||
for (ireg = 32; --ireg >= 0; )
|
||
if (PROC_FREG_MASK(proc_desc) & (1 << ireg))
|
||
{
|
||
buffer = read_register (ireg);
|
||
write_memory (save_address, &buffer, 4);
|
||
save_address -= 4;
|
||
}
|
||
write_register (PUSH_FP_REGNUM, sp);
|
||
PROC_FRAME_REG(proc_desc) = PUSH_FP_REGNUM;
|
||
PROC_FRAME_OFFSET(proc_desc) = 0;
|
||
buffer = read_register (PC_REGNUM);
|
||
write_memory (sp - 4, &buffer, sizeof(REGISTER_TYPE));
|
||
buffer = read_register (HI_REGNUM);
|
||
write_memory (sp - 8, &buffer, sizeof(REGISTER_TYPE));
|
||
buffer = read_register (LO_REGNUM);
|
||
write_memory (sp - 12, &buffer, sizeof(REGISTER_TYPE));
|
||
buffer = read_register (FCRCS_REGNUM);
|
||
write_memory (sp - 16, &buffer, sizeof(REGISTER_TYPE));
|
||
sp -= 4 * (GEN_REG_SAVE_COUNT+FLOAT_REG_SAVE_COUNT+SPECIAL_REG_SAVE_COUNT);
|
||
write_register (SP_REGNUM, sp);
|
||
PROC_LOW_ADDR(proc_desc) = sp - CALL_DUMMY_SIZE + CALL_DUMMY_START_OFFSET;
|
||
PROC_HIGH_ADDR(proc_desc) = sp;
|
||
SET_PROC_DESC_IS_DUMMY(proc_desc);
|
||
PROC_PC_REG(proc_desc) = RA_REGNUM;
|
||
}
|
||
|
||
void
|
||
mips_pop_frame()
|
||
{ register int regnum;
|
||
FRAME frame = get_current_frame ();
|
||
CORE_ADDR new_sp = frame->frame;
|
||
mips_extra_func_info_t proc_desc = (mips_extra_func_info_t)frame->proc_desc;
|
||
if (PROC_DESC_IS_DUMMY(proc_desc))
|
||
{
|
||
struct linked_proc_info **ptr = &linked_proc_desc_table;;
|
||
for (; &ptr[0]->info != proc_desc; ptr = &ptr[0]->next )
|
||
if (ptr[0] == NULL) abort();
|
||
*ptr = ptr[0]->next;
|
||
free (ptr[0]);
|
||
write_register (HI_REGNUM, read_memory_integer(new_sp - 8, 4));
|
||
write_register (LO_REGNUM, read_memory_integer(new_sp - 12, 4));
|
||
write_register (FCRCS_REGNUM, read_memory_integer(new_sp - 16, 4));
|
||
}
|
||
write_register (PC_REGNUM, FRAME_SAVED_PC(frame));
|
||
if (frame->proc_desc) {
|
||
for (regnum = 32; --regnum >= 0; )
|
||
if (PROC_REG_MASK(proc_desc) & (1 << regnum))
|
||
write_register (regnum,
|
||
read_memory_integer (frame->saved_regs->regs[regnum], 4));
|
||
for (regnum = 64; --regnum >= 32; )
|
||
if (PROC_FREG_MASK(proc_desc) & (1 << regnum))
|
||
write_register (regnum,
|
||
read_memory_integer (frame->saved_regs->regs[regnum], 4));
|
||
}
|
||
write_register (SP_REGNUM, new_sp);
|
||
flush_cached_frames ();
|
||
set_current_frame (create_new_frame (new_sp, read_pc ()));
|
||
}
|
||
|
||
static
|
||
mips_print_register(regnum, all)
|
||
int regnum, all;
|
||
{
|
||
unsigned char raw_buffer[8];
|
||
REGISTER_TYPE val;
|
||
|
||
read_relative_register_raw_bytes (regnum, raw_buffer);
|
||
|
||
if (!(regnum & 1) && regnum >= FP0_REGNUM && regnum < FP0_REGNUM+32) {
|
||
read_relative_register_raw_bytes (regnum+1, raw_buffer+4);
|
||
printf_filtered ("(d%d: ", regnum&31);
|
||
val_print (builtin_type_double, raw_buffer, 0,
|
||
stdout, 0, 1, 0, Val_pretty_default);
|
||
printf_filtered ("); ", regnum&31);
|
||
}
|
||
fputs_filtered (reg_names[regnum], stdout);
|
||
#ifndef NUMERIC_REG_NAMES
|
||
if (regnum < 32)
|
||
printf_filtered ("(r%d): ", regnum);
|
||
else
|
||
#endif
|
||
printf_filtered (": ");
|
||
|
||
/* If virtual format is floating, print it that way. */
|
||
if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum)) == TYPE_CODE_FLT
|
||
&& ! INVALID_FLOAT (raw_buffer, REGISTER_VIRTUAL_SIZE(regnum))) {
|
||
val_print (REGISTER_VIRTUAL_TYPE (regnum), raw_buffer, 0,
|
||
stdout, 0, 1, 0, Val_pretty_default);
|
||
}
|
||
/* Else print as integer in hex. */
|
||
else
|
||
{
|
||
long val;
|
||
|
||
bcopy (raw_buffer, &val, sizeof (long));
|
||
if (val == 0)
|
||
printf_filtered ("0");
|
||
else if (all)
|
||
printf_filtered (local_hex_format(), val);
|
||
else
|
||
printf_filtered ("%s=%d", local_hex_string(val), val);
|
||
}
|
||
}
|
||
|
||
/* Replacement for generic do_registers_info. */
|
||
mips_do_registers_info (regnum, fpregs)
|
||
int regnum;
|
||
int fpregs;
|
||
{
|
||
if (regnum != -1) {
|
||
mips_print_register (regnum, 0);
|
||
printf_filtered ("\n");
|
||
}
|
||
else {
|
||
for (regnum = 0; regnum < NUM_REGS; ) {
|
||
if ((!fpregs) && regnum >= FP0_REGNUM && regnum <= FCRIR_REGNUM) {
|
||
regnum++;
|
||
continue;
|
||
}
|
||
mips_print_register (regnum, 1);
|
||
regnum++;
|
||
if ((regnum & 3) == 0 || regnum == NUM_REGS)
|
||
printf_filtered (";\n");
|
||
else
|
||
printf_filtered ("; ");
|
||
}
|
||
}
|
||
}
|
||
/* Return number of args passed to a frame. described by FIP.
|
||
Can return -1, meaning no way to tell. */
|
||
|
||
mips_frame_num_args(fip)
|
||
FRAME fip;
|
||
{
|
||
#if 0
|
||
struct chain_info_t *p;
|
||
|
||
p = mips_find_cached_frame(FRAME_FP(fip));
|
||
if (p->valid)
|
||
return p->the_info.numargs;
|
||
#endif
|
||
return -1;
|
||
}
|
||
|
||
|
||
/* Bad floats: Returns 0 if P points to a valid IEEE floating point number,
|
||
1 if P points to a denormalized number or a NaN. LEN says whether this is
|
||
a single-precision or double-precision float */
|
||
#define SINGLE_EXP_BITS 8
|
||
#define DOUBLE_EXP_BITS 11
|
||
int
|
||
isa_NAN(p, len)
|
||
int *p, len;
|
||
{
|
||
int exponent;
|
||
if (len == 4)
|
||
{
|
||
exponent = *p;
|
||
exponent = exponent << 1 >> (32 - SINGLE_EXP_BITS - 1);
|
||
return ((exponent == -1) || (! exponent && *p));
|
||
}
|
||
else if (len == 8)
|
||
{
|
||
exponent = *(p+1);
|
||
exponent = exponent << 1 >> (32 - DOUBLE_EXP_BITS - 1);
|
||
return ((exponent == -1) || (! exponent && *p * *(p+1)));
|
||
}
|
||
else return 1;
|
||
}
|
||
|
||
/* To skip prologues, I use this predicate. Returns either PC
|
||
itself if the code at PC does not look like a function prologue,
|
||
PC+4 if it does (our caller does not need anything more fancy). */
|
||
|
||
CORE_ADDR mips_skip_prologue(pc)
|
||
CORE_ADDR pc;
|
||
{
|
||
struct symbol *f;
|
||
struct block *b;
|
||
unsigned long inst;
|
||
|
||
/* For -g modules and most functions anyways the
|
||
first instruction adjusts the stack. */
|
||
inst = read_memory_integer(pc, 4);
|
||
if ((inst & 0xffff0000) == 0x27bd0000)
|
||
return pc + 4;
|
||
|
||
/* Well, it looks like a frameless. Let's make sure.
|
||
Note that we are not called on the current PC,
|
||
but on the function`s start PC, and I have definitely
|
||
seen optimized code that adjusts the SP quite later */
|
||
b = block_for_pc(pc);
|
||
if (!b) return pc;
|
||
|
||
f = lookup_symbol(".gdbinfo.", b, LABEL_NAMESPACE, 0, NULL);
|
||
if (!f) return pc;
|
||
/* Ideally, I would like to use the adjusted info
|
||
from mips_frame_info(), but for all practical
|
||
purposes it will not matter (and it would require
|
||
a different definition of SKIP_PROLOGUE())
|
||
|
||
Actually, it would not hurt to skip the storing
|
||
of arguments on the stack as well. */
|
||
if (((struct mips_extra_func_info *)f->value.value)->framesize)
|
||
return pc + 4;
|
||
|
||
return pc;
|
||
}
|