22c68d23f5
with Brian's kernel support for i386 debug registers. This makes watchpoints actually usable for real-life problems. Note: you can only set watchpoints on 1-, 2- or 4-byte locations, gdb automatically falls back to [sloooow] software watchpoints when attempting to use them on variables which don't fit into this category. To circumvent this, one can use the following hack: watch *(int *)0x<some address> David O'Brien is IMHO considering to get this fully integrated into the official GDB, but as long as we've got the i386/* files sitting around in our private FreeBSD tree here, the feature can now be tested more extensively, so i'm committing this for the time being. This work has been done in order to debug a tix toolkit problem, thus it has been sponsored by teh Deutsche Post AG. Reviewed by: bsd (not the operating system, but Brian :-)
654 lines
16 KiB
C
654 lines
16 KiB
C
/* $FreeBSD$ */
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/* Native-dependent code for BSD Unix running on i386's, for GDB.
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Copyright 1988, 1989, 1991, 1992, 1994, 1996 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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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#include "gdbcore.h"
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#include "value.h"
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#include "inferior.h"
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#if defined(HAVE_GREGSET_T) || defined(HAVE_FPREGSET_T)
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#include <sys/procfs.h>
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#endif
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/* this table must line up with REGISTER_NAMES in tm-i386v.h */
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/* symbols like 'tEAX' come from <machine/reg.h> */
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static int tregmap[] =
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{
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tEAX, tECX, tEDX, tEBX,
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tESP, tEBP, tESI, tEDI,
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tEIP, tEFLAGS, tCS, tSS,
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tDS, tES, tFS, tGS,
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};
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static struct save87 pcb_savefpu;
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
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int r;
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ptrace (PT_GETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers, 0);
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for (r = 0; r < NUM_REGS; r++)
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memcpy (®isters[REGISTER_BYTE (r)], ((int *)&inferior_registers) + tregmap[r], 4);
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registers_fetched ();
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}
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void
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store_inferior_registers (regno)
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int regno;
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{
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struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
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int r;
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for (r = 0; r < NUM_REGS; r++)
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memcpy (((int *)&inferior_registers) + tregmap[r], ®isters[REGISTER_BYTE (r)], 4);
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ptrace (PT_SETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers, 0);
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}
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/* Extract the register values out of the core file and store
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them where `read_register' will find them.
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Extract the floating point state out of the core file and store
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it where `float_info' will find it.
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CORE_REG_SECT points to the register values themselves, read into memory.
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CORE_REG_SIZE is the size of that area.
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WHICH says which set of registers we are handling (0 = int, 2 = float
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on machines where they are discontiguous).
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REG_ADDR is the offset from u.u_ar0 to the register values relative to
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core_reg_sect. This is used with old-fashioned core files to
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locate the registers in a large upage-plus-stack ".reg" section.
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Original upage address X is at location core_reg_sect+x+reg_addr.
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*/
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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CORE_ADDR reg_addr;
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{
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register int regno;
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register int cregno;
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register int addr;
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int bad_reg = -1;
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int offset;
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struct user *tmp_uaddr;
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/*
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* First get virtual address of user structure. Then calculate offset.
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*/
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memcpy(&tmp_uaddr,
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&((struct user *) core_reg_sect)->u_kproc.kp_proc.p_addr,
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sizeof(tmp_uaddr));
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offset = -reg_addr - (int) tmp_uaddr;
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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cregno = tregmap[regno];
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if (cregno == tGS)
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addr = offsetof (struct user, u_pcb) + offsetof (struct pcb, pcb_gs);
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else
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addr = offset + 4 * cregno;
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if (addr < 0 || addr >= core_reg_size)
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{
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if (bad_reg < 0)
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bad_reg = regno;
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}
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else
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{
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supply_register (regno, core_reg_sect + addr);
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}
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}
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if (bad_reg >= 0)
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{
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error ("Register %s not found in core file.", gdb_register_names[bad_reg]);
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}
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addr = offsetof (struct user, u_pcb) + offsetof (struct pcb, pcb_savefpu);
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memcpy (&pcb_savefpu, core_reg_sect + addr, sizeof pcb_savefpu);
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}
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#ifdef FLOAT_INFO
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#include "expression.h"
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#include "language.h" /* for local_hex_string */
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#include "floatformat.h"
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#include <sys/param.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <a.out.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/uio.h>
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#define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */
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#include <sys/user.h>
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#undef curpcb
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#include <sys/file.h>
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#include "gdb_stat.h"
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#include <sys/ptrace.h>
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extern void print_387_control_word (); /* i387-tdep.h */
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extern void print_387_status_word ();
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#define fpstate save87
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#define U_FPSTATE(u) u.u_pcb.pcb_savefpu
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static void
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i387_to_double (from, to)
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char *from;
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char *to;
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{
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long *lp;
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/* push extended mode on 387 stack, then pop in double mode
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*
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* first, set exception masks so no error is generated -
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* number will be rounded to inf or 0, if necessary
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*/
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asm ("pushl %eax"); /* grab a stack slot */
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asm ("fstcw (%esp)"); /* get 387 control word */
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asm ("movl (%esp),%eax"); /* save old value */
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asm ("orl $0x3f,%eax"); /* mask all exceptions */
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asm ("pushl %eax");
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asm ("fldcw (%esp)"); /* load new value into 387 */
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asm ("movl 8(%ebp),%eax");
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asm ("fldt (%eax)"); /* push extended number on 387 stack */
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asm ("fwait");
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asm ("movl 12(%ebp),%eax");
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asm ("fstpl (%eax)"); /* pop double */
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asm ("fwait");
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asm ("popl %eax"); /* flush modified control word */
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asm ("fnclex"); /* clear exceptions */
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asm ("fldcw (%esp)"); /* restore original control word */
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asm ("popl %eax"); /* flush saved copy */
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}
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struct env387
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{
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unsigned short control;
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unsigned short r0;
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unsigned short status;
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unsigned short r1;
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unsigned short tag;
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unsigned short r2;
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unsigned long eip;
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unsigned short code_seg;
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unsigned short opcode;
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unsigned long operand;
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unsigned short operand_seg;
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unsigned short r3;
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unsigned char regs[8][10];
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};
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static void
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print_387_status (status, ep)
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unsigned short status;
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struct env387 *ep;
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{
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int i;
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int bothstatus;
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int top;
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int fpreg;
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bothstatus = ((status != 0) && (ep->status != 0));
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if (status != 0)
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{
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if (bothstatus)
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printf_unfiltered ("u: ");
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print_387_status_word ((unsigned int)status);
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}
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if (ep->status != 0)
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{
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if (bothstatus)
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printf_unfiltered ("e: ");
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print_387_status_word ((unsigned int)ep->status);
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}
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print_387_control_word ((unsigned int)ep->control);
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printf_unfiltered ("last instruction: ");
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printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
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printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
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printf_unfiltered ("%s; ", local_hex_string(ep->eip));
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printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
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printf_unfiltered (":%s\n", local_hex_string(ep->operand));
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top = (ep->status >> 11) & 7;
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printf_unfiltered (" regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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int exp;
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int mantissa_or;
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int normal;
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char *sign;
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int st_regno;
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unsigned short *usregs;
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double val;
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/* The physical regno `fpreg' is only relevant as an index into the
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* tag word. Logical `%st' numbers are required for indexing ep->regs.
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*/
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st_regno = (fpreg + 8 - top) & 7;
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printf_unfiltered ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " ");
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switch ((ep->tag >> (fpreg * 2)) & 3)
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{
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case 0: printf_unfiltered ("valid "); break;
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case 1: printf_unfiltered ("zero "); break;
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case 2: printf_unfiltered ("trap "); break;
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case 3: printf_unfiltered ("empty "); break;
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}
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for (i = 9; i >= 0; i--)
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printf_unfiltered ("%02x", ep->regs[st_regno][i]);
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printf_unfiltered (" ");
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/*
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* Handle weird cases better than floatformat_to_double () and
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* printf ().
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*/
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usregs = (unsigned short *) ep->regs[st_regno];
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sign = usregs[4] & 0x8000 ? "-" : "";
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exp = usregs[4] & 0x7fff;
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normal = usregs[3] & 0x8000;
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mantissa_or = usregs[0] | usregs[1] | usregs[2] | (usregs[3] & 0x7fff);
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if (exp == 0)
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{
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if (normal)
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printf_unfiltered ("Pseudo Denormal (0 as a double)");
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else if (mantissa_or == 0)
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printf_unfiltered ("%s0", sign);
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else
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printf_unfiltered ("Denormal (0 as a double)");
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}
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else if (exp == 0x7fff)
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{
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if (!normal)
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printf_unfiltered ("Pseudo ");
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if (mantissa_or == 0)
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printf_unfiltered ("%sInf", sign);
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else
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printf_unfiltered ("%s NaN",
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usregs[3] & 0x4000 ? "Quiet" : "Signaling");
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if (!normal)
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printf_unfiltered (" (NaN)");
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}
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else if (!normal)
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printf_unfiltered ("Unnormal (NaN)");
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else
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{
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#if 0
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/* Use this we stop trapping on overflow. */
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floatformat_to_double(&floatformat_i387_ext,
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(char *) ep->regs[st_regno], &val);
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#else
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i387_to_double((char *) ep->regs[st_regno], (char *) &val);
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#endif
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printf_unfiltered ("%g", val);
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}
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printf_unfiltered ("\n");
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}
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}
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void
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i386_float_info ()
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{
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struct user u; /* just for address computations */
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int i;
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/* fpstate defined in <sys/user.h> */
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struct fpstate *fpstatep;
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char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
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unsigned int uaddr;
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char fpvalid;
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unsigned int rounded_addr;
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unsigned int rounded_size;
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/*extern int corechan;*/
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int skip;
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extern int inferior_pid;
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uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
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if (inferior_pid != 0 && core_bfd == NULL)
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{
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int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */
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ptrace(PT_GETFPREGS, pid, &buf[0], sizeof(struct fpreg));
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fpstatep = (struct fpstate *)&buf[0];
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}
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else
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fpstatep = &pcb_savefpu;
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print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep);
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}
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#endif /* FLOAT_INFO */
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int
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kernel_u_size ()
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{
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return (sizeof (struct user));
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}
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#ifdef SETUP_ARBITRARY_FRAME
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#include "frame.h"
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struct frame_info *
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setup_arbitrary_frame (argc, argv)
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int argc;
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CORE_ADDR *argv;
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{
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if (argc != 2)
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error ("i386 frame specifications require two arguments: sp and pc");
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return create_new_frame (argv[0], argv[1]);
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}
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#endif /* SETUP_ARBITRARY_FRAME */
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#ifdef HAVE_GREGSET_T
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void
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supply_gregset (gp)
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gregset_t *gp;
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{
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int regno = 0;
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/* These must be ordered the same as REGISTER_NAMES in
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config/i386/tm-i386.h. */
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supply_register (regno++, (char *)&gp->r_eax);
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supply_register (regno++, (char *)&gp->r_ecx);
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supply_register (regno++, (char *)&gp->r_edx);
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supply_register (regno++, (char *)&gp->r_ebx);
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supply_register (regno++, (char *)&gp->r_esp);
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supply_register (regno++, (char *)&gp->r_ebp);
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supply_register (regno++, (char *)&gp->r_esi);
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supply_register (regno++, (char *)&gp->r_edi);
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supply_register (regno++, (char *)&gp->r_eip);
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supply_register (regno++, (char *)&gp->r_eflags);
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supply_register (regno++, (char *)&gp->r_cs);
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supply_register (regno++, (char *)&gp->r_ss);
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supply_register (regno++, (char *)&gp->r_ds);
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supply_register (regno++, (char *)&gp->r_es);
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supply_register (regno++, (char *)&gp->r_fs);
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supply_register (regno++, (char *)&gp->r_gs);
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}
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#endif /* HAVE_GREGSET_T */
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#ifdef HAVE_FPREGSET_T
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void
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supply_fpregset (fp)
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fpregset_t *fp;
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{
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memcpy (&pcb_savefpu, fp, sizeof pcb_savefpu);
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}
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#endif /* HAVE_FPREGSET_T */
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/* Register that we are able to handle aout (trad-core) file formats. */
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static struct core_fns aout_core_fns =
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{
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bfd_target_unknown_flavour,
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fetch_core_registers,
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NULL
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};
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void
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_initialize_core_aout ()
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{
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add_core_fns (&aout_core_fns);
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}
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#ifdef PT_GETDBREGS
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/*
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* 0: no trace output
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* 1: trace watchpoint requests
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* 2: trace `watchpoint hit?' tests, too
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*/
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#define WATCHPOINT_DEBUG 0
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#include "breakpoint.h"
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int
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can_watch(type, cnt, ot)
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int type, cnt, ot;
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{
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int rv;
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static int cnt_watch, cnt_awatch;
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switch (type)
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{
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case bp_hardware_watchpoint:
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cnt_watch = cnt;
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break;
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case bp_access_watchpoint:
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cnt_awatch = cnt;
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break;
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default:
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rv = 0;
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goto overandout;
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}
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rv = cnt_watch + cnt_awatch <= 4? 1: -1;
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overandout:
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#if WATCHPOINT_DEBUG
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printf_filtered("can_watch(%d, %d, %d) = %d (counts: w: %d, rw: %d)\n",
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type, cnt, ot, rv, cnt_watch, cnt_awatch);
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#endif
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return rv;
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}
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int
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stopped_by_watchpoint()
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{
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struct dbreg dbr;
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extern int inferior_pid;
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if (inferior_pid != 0 && core_bfd == NULL)
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{
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int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */
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if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1)
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{
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perror("ptrace(PT_GETDBREGS) failed");
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return 0;
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}
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#if WATCHPOINT_DEBUG > 1
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printf_filtered("stopped_by_watchpoint(): DR6 = %#x\n", dbr.dr6);
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#endif
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/*
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* If a hardware watchpoint was hit, one of the lower 4 bits in
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* DR6 is set (the actual bit indicates which of DR0...DR3 triggered
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* the trap).
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*/
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return dbr.dr6 & 0x0f;
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}
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else
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{
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warning("Can't set a watchpoint on a core file.");
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return 0;
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}
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}
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int
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insert_watchpoint(addr, len, type)
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int addr, len, type;
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||
{
|
||
struct dbreg dbr;
|
||
extern int inferior_pid;
|
||
|
||
if (inferior_pid != 0 && core_bfd == NULL)
|
||
{
|
||
int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */
|
||
int i, mask;
|
||
unsigned int sbits;
|
||
|
||
if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1)
|
||
{
|
||
perror("ptrace(PT_GETDBREGS) failed");
|
||
return 0;
|
||
}
|
||
|
||
for (i = 0, mask = 0x03; i < 4; i++, mask <<= 2)
|
||
if ((dbr.dr7 & mask) == 0)
|
||
break;
|
||
if (i >= 4) {
|
||
warning("no more hardware watchpoints available");
|
||
return -1;
|
||
}
|
||
|
||
/* paranoia */
|
||
if (len > 4)
|
||
{
|
||
warning("watchpoint length %d unsupported, using lenght = 4",
|
||
len);
|
||
len = 4;
|
||
}
|
||
else if (len == 3)
|
||
{
|
||
warning("weird watchpoint length 3, using 2");
|
||
len = 2;
|
||
}
|
||
else if (len == 0)
|
||
{
|
||
warning("weird watchpoint length 0, using 1");
|
||
len = 1;
|
||
}
|
||
|
||
switch (len)
|
||
{
|
||
case 1: sbits = 0; break;
|
||
case 2: sbits = 4; break;
|
||
case 4: sbits = 0x0c; break;
|
||
}
|
||
|
||
/*
|
||
* The `type' value is 0 for `watch on write', 1 for `watch on
|
||
* read', 2 for `watch on both'. The i386 debug register
|
||
* breakpoint types are 0 for `execute' (not used in GDB), 1 for
|
||
* `write', and 4 for `read/write'. Plain `read' trapping is
|
||
* not supported on i386, value 3 is illegal.
|
||
*/
|
||
switch (type)
|
||
{
|
||
default:
|
||
warning("weird watchpoint type %d, using a write watchpoint");
|
||
/* FALLTHROUGH */
|
||
case 0:
|
||
sbits |= 1;
|
||
break;
|
||
|
||
case 2:
|
||
sbits |= 3;
|
||
break;
|
||
}
|
||
sbits <<= 4 * i + 16;
|
||
sbits |= 1 << 2 * i;
|
||
|
||
dbr.dr7 |= sbits;
|
||
*(&dbr.dr0 + i) = (unsigned int)addr;
|
||
|
||
#if WATCHPOINT_DEBUG
|
||
printf_filtered("insert_watchpoint(), inserting DR7 = %#x, DR%d = %#x\n",
|
||
dbr.dr7, i, addr);
|
||
#endif
|
||
if (ptrace(PT_SETDBREGS, pid, (caddr_t)&dbr, 0) == -1)
|
||
{
|
||
perror("ptrace(PT_SETDBREGS) failed");
|
||
return 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
warning("Can't set a watchpoint on a core file.");
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
int
|
||
remove_watchpoint(addr, len, type)
|
||
int addr, len, type;
|
||
{
|
||
struct dbreg dbr;
|
||
extern int inferior_pid;
|
||
|
||
if (inferior_pid != 0 && core_bfd == NULL)
|
||
{
|
||
int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */
|
||
int i;
|
||
unsigned int sbits, *dbregp;
|
||
|
||
if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1)
|
||
{
|
||
perror("ptrace(PT_GETDBREGS) failed");
|
||
return 0;
|
||
}
|
||
|
||
for (i = 0, dbregp = &dbr.dr0; i < 4; i++, dbregp++)
|
||
if (*dbregp == (unsigned int)addr)
|
||
break;
|
||
if (i >= 4)
|
||
{
|
||
warning("watchpoint for address %#x not found", addr);
|
||
return -1;
|
||
}
|
||
|
||
*dbregp = 0;
|
||
sbits = 0xf << (4 * i + 16);
|
||
sbits |= 3 << 2 * i;
|
||
dbr.dr7 &= ~sbits;
|
||
|
||
#if WATCHPOINT_DEBUG
|
||
printf_filtered("remove_watchpoint(): removing watchpoint for %#x, DR7 = %#x\n",
|
||
addr, dbr.dr7);
|
||
#endif
|
||
if (ptrace(PT_SETDBREGS, pid, (caddr_t)&dbr, 0) == -1)
|
||
{
|
||
perror("ptrace(PT_SETDBREGS) failed");
|
||
return 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
warning("Can't set a watchpoint on a core file.");
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
#endif /* PT_GETDBREGS */
|