4a24038b4c
when using gdb on a remote target. The fix is to restrict PT_GETDBREGS calls to `child' and `freebsd-uthreads' targets solely. I've been in some conversation with Brian about this, and this solution seems to be the most appropriate one. PR: gnu/21685 Submitted by: bsd
669 lines
16 KiB
C
669 lines
16 KiB
C
/* $FreeBSD$ */
|
||
/* Native-dependent code for BSD Unix running on i386's, for GDB.
|
||
Copyright 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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||
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||
#include "defs.h"
|
||
|
||
#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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/*
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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.ki_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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|
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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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/*
|
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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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{
|
||
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
|
||
printf_unfiltered ("Denormal (0 as a double)");
|
||
}
|
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else if (exp == 0x7fff)
|
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{
|
||
if (!normal)
|
||
printf_unfiltered ("Pseudo ");
|
||
if (mantissa_or == 0)
|
||
printf_unfiltered ("%sInf", sign);
|
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else
|
||
printf_unfiltered ("%s NaN",
|
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usregs[3] & 0x4000 ? "Quiet" : "Signaling");
|
||
if (!normal)
|
||
printf_unfiltered (" (NaN)");
|
||
}
|
||
else if (!normal)
|
||
printf_unfiltered ("Unnormal (NaN)");
|
||
else
|
||
{
|
||
#if 0
|
||
/* Use this we stop trapping on overflow. */
|
||
floatformat_to_double(&floatformat_i387_ext,
|
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(char *) ep->regs[st_regno], &val);
|
||
#else
|
||
i387_to_double((char *) ep->regs[st_regno], (char *) &val);
|
||
#endif
|
||
printf_unfiltered ("%g", val);
|
||
}
|
||
printf_unfiltered ("\n");
|
||
}
|
||
}
|
||
|
||
void
|
||
i386_float_info ()
|
||
{
|
||
struct user u; /* just for address computations */
|
||
int i;
|
||
/* fpstate defined in <sys/user.h> */
|
||
struct fpstate *fpstatep;
|
||
char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
|
||
unsigned int uaddr;
|
||
char fpvalid;
|
||
unsigned int rounded_addr;
|
||
unsigned int rounded_size;
|
||
/*extern int corechan;*/
|
||
int skip;
|
||
extern int inferior_pid;
|
||
|
||
uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
|
||
if (inferior_pid != 0 && core_bfd == NULL)
|
||
{
|
||
int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */
|
||
ptrace(PT_GETFPREGS, pid, &buf[0], sizeof(struct fpreg));
|
||
fpstatep = (struct fpstate *)&buf[0];
|
||
}
|
||
else
|
||
fpstatep = &pcb_savefpu;
|
||
|
||
print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep);
|
||
}
|
||
#endif /* FLOAT_INFO */
|
||
|
||
int
|
||
kernel_u_size ()
|
||
{
|
||
return (sizeof (struct user));
|
||
}
|
||
|
||
#ifdef SETUP_ARBITRARY_FRAME
|
||
#include "frame.h"
|
||
struct frame_info *
|
||
setup_arbitrary_frame (argc, argv)
|
||
int argc;
|
||
CORE_ADDR *argv;
|
||
{
|
||
if (argc != 2)
|
||
error ("i386 frame specifications require two arguments: sp and pc");
|
||
|
||
return create_new_frame (argv[0], argv[1]);
|
||
}
|
||
#endif /* SETUP_ARBITRARY_FRAME */
|
||
|
||
#ifdef HAVE_GREGSET_T
|
||
void
|
||
supply_gregset (gp)
|
||
gregset_t *gp;
|
||
{
|
||
int regno = 0;
|
||
|
||
/* These must be ordered the same as REGISTER_NAMES in
|
||
config/i386/tm-i386.h. */
|
||
supply_register (regno++, (char *)&gp->r_eax);
|
||
supply_register (regno++, (char *)&gp->r_ecx);
|
||
supply_register (regno++, (char *)&gp->r_edx);
|
||
supply_register (regno++, (char *)&gp->r_ebx);
|
||
supply_register (regno++, (char *)&gp->r_esp);
|
||
supply_register (regno++, (char *)&gp->r_ebp);
|
||
supply_register (regno++, (char *)&gp->r_esi);
|
||
supply_register (regno++, (char *)&gp->r_edi);
|
||
supply_register (regno++, (char *)&gp->r_eip);
|
||
supply_register (regno++, (char *)&gp->r_eflags);
|
||
supply_register (regno++, (char *)&gp->r_cs);
|
||
supply_register (regno++, (char *)&gp->r_ss);
|
||
supply_register (regno++, (char *)&gp->r_ds);
|
||
supply_register (regno++, (char *)&gp->r_es);
|
||
supply_register (regno++, (char *)&gp->r_fs);
|
||
supply_register (regno++, (char *)&gp->r_gs);
|
||
}
|
||
#endif /* HAVE_GREGSET_T */
|
||
|
||
#ifdef HAVE_FPREGSET_T
|
||
void
|
||
supply_fpregset (fp)
|
||
fpregset_t *fp;
|
||
{
|
||
memcpy (&pcb_savefpu, fp, sizeof pcb_savefpu);
|
||
}
|
||
#endif /* HAVE_FPREGSET_T */
|
||
|
||
/* Register that we are able to handle aout (trad-core) file formats. */
|
||
|
||
static struct core_fns aout_core_fns =
|
||
{
|
||
bfd_target_unknown_flavour,
|
||
fetch_core_registers,
|
||
NULL
|
||
};
|
||
|
||
void
|
||
_initialize_core_aout ()
|
||
{
|
||
add_core_fns (&aout_core_fns);
|
||
}
|
||
|
||
#ifdef PT_GETDBREGS
|
||
|
||
/*
|
||
* 0: no trace output
|
||
* 1: trace watchpoint requests
|
||
* 2: trace `watchpoint hit?' tests, too
|
||
*/
|
||
#define WATCHPOINT_DEBUG 0
|
||
|
||
#include "breakpoint.h"
|
||
|
||
int
|
||
can_watch(type, cnt, ot)
|
||
int type, cnt, ot;
|
||
{
|
||
int rv;
|
||
static int cnt_watch, cnt_awatch;
|
||
|
||
switch (type)
|
||
{
|
||
case bp_hardware_watchpoint:
|
||
cnt_watch = cnt;
|
||
break;
|
||
|
||
case bp_access_watchpoint:
|
||
cnt_awatch = cnt;
|
||
break;
|
||
|
||
default:
|
||
rv = 0;
|
||
goto overandout;
|
||
}
|
||
|
||
rv = cnt_watch + cnt_awatch <= 4? 1: -1;
|
||
|
||
overandout:
|
||
#if WATCHPOINT_DEBUG
|
||
printf_filtered("can_watch(%d, %d, %d) = %d (counts: w: %d, rw: %d)\n",
|
||
type, cnt, ot, rv, cnt_watch, cnt_awatch);
|
||
#endif
|
||
|
||
return rv;
|
||
}
|
||
|
||
int
|
||
stopped_by_watchpoint()
|
||
{
|
||
struct dbreg dbr;
|
||
extern int inferior_pid;
|
||
|
||
if (current_target.to_shortname == 0 ||
|
||
! (strcmp(current_target.to_shortname, "child") == 0 ||
|
||
strcmp(current_target.to_shortname, "freebsd-uthreads") == 0))
|
||
return 0;
|
||
|
||
if (inferior_pid != 0 && core_bfd == NULL)
|
||
{
|
||
int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */
|
||
|
||
if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1)
|
||
{
|
||
perror("ptrace(PT_GETDBREGS) failed");
|
||
return 0;
|
||
}
|
||
#if WATCHPOINT_DEBUG > 1
|
||
printf_filtered("stopped_by_watchpoint(): DR6 = %#x\n", dbr.dr6);
|
||
#endif
|
||
/*
|
||
* If a hardware watchpoint was hit, one of the lower 4 bits in
|
||
* DR6 is set (the actual bit indicates which of DR0...DR3 triggered
|
||
* the trap).
|
||
*/
|
||
return dbr.dr6 & 0x0f;
|
||
}
|
||
else
|
||
{
|
||
warning("Can't set a watchpoint on a core file.");
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
int
|
||
insert_watchpoint(addr, len, type)
|
||
int addr, len, type;
|
||
{
|
||
struct dbreg dbr;
|
||
extern int inferior_pid;
|
||
|
||
if (current_target.to_shortname == 0 ||
|
||
! (strcmp(current_target.to_shortname, "child") == 0 ||
|
||
strcmp(current_target.to_shortname, "freebsd-uthreads") == 0))
|
||
return 0;
|
||
|
||
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 (current_target.to_shortname == 0 ||
|
||
! (strcmp(current_target.to_shortname, "child") == 0 ||
|
||
strcmp(current_target.to_shortname, "freebsd-uthreads") == 0))
|
||
return 0;
|
||
|
||
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 */
|