Initial creation of sourceware repository
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Stan Shebs
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258
gdb/sun386-nat.c
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258
gdb/sun386-nat.c
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/* Native support for Sun 386i's for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
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Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
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C2V Paris, April 89.
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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 "frame.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <sys/user.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 <sys/ptrace.h>
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#include <machine/reg.h>
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#include <sys/file.h>
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#include "gdb_stat.h"
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#include <sys/core.h>
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/* Machine-dependent code which would otherwise be in corefile.c */
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/* Work with core files, for GDB. */
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void
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core_file_command (filename, from_tty)
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char *filename;
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int from_tty;
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{
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int val;
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extern char registers[];
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/* Discard all vestiges of any previous core file
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and mark data and stack spaces as empty. */
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if (corefile)
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free (corefile);
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corefile = 0;
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if (corechan >= 0)
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close (corechan);
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corechan = -1;
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data_start = 0;
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data_end = 0;
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stack_start = STACK_END_ADDR;
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stack_end = STACK_END_ADDR;
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/* Now, if a new core file was specified, open it and digest it. */
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if (filename)
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{
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filename = tilde_expand (filename);
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make_cleanup (free, filename);
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if (have_inferior_p ())
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error ("To look at a core file, you must kill the program with \"kill\".");
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corechan = open (filename, O_RDONLY, 0);
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if (corechan < 0)
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perror_with_name (filename);
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{
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struct core corestr;
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val = myread (corechan, &corestr, sizeof corestr);
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if (val < 0)
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perror_with_name (filename);
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if (corestr.c_magic != CORE_MAGIC)
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error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
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filename, corestr.c_magic, (int) CORE_MAGIC);
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else if (sizeof (struct core) != corestr.c_len)
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error ("\"%s\" has an invalid struct core length (%d, expected %d)",
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filename, corestr.c_len, (int) sizeof (struct core));
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data_start = exec_data_start;
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data_end = data_start + corestr.c_dsize;
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stack_start = stack_end - corestr.c_ssize;
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data_offset = sizeof corestr;
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stack_offset = sizeof corestr + corestr.c_dsize;
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memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
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corestr.c_fpu.f_fpstatus.f_st,
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sizeof corestr.c_fpu.f_fpstatus.f_st);
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memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
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&corestr.c_fpu.f_fpstatus.f_ctrl,
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sizeof corestr.c_fpu.f_fpstatus -
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sizeof corestr.c_fpu.f_fpstatus.f_st);
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/* the struct aouthdr of sun coff is not the struct exec stored
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in the core file. */
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memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
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#ifndef COFF_ENCAPSULATE
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core_aouthdr.magic = corestr.c_aouthdr.a_info;
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core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
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#endif
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printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);
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if (corestr.c_signo > 0)
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printf_unfiltered ("Program terminated with signal %d, %s.\n",
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corestr.c_signo, safe_strsignal (corestr.c_signo));
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}
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if (filename[0] == '/')
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corefile = savestring (filename, strlen (filename));
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else
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{
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corefile = concat (current_directory, "/", filename, NULL);
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}
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flush_cached_frames ();
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select_frame (get_current_frame (), 0);
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validate_files ();
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}
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else if (from_tty)
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printf_unfiltered ("No core file now.\n");
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}
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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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double_to_i387 (from, to)
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char *from;
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char *to;
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{
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/* push double mode on 387 stack, then pop in extended mode
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* no errors are possible because every 64-bit pattern
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* can be converted to an extended
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*/
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asm ("movl 8(%ebp),%eax");
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asm ("fldl (%eax)");
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asm ("fwait");
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asm ("movl 12(%ebp),%eax");
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asm ("fstpt (%eax)");
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asm ("fwait");
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}
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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 regs inferior_registers;
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struct fp_state inferior_fp_registers;
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extern char registers[];
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registers_fetched ();
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ptrace (PTRACE_GETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers);
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ptrace (PTRACE_GETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_fp_registers);
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memcpy (registers, &inferior_registers, sizeof inferior_registers);
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
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sizeof inferior_fp_registers.f_st);
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memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
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&inferior_fp_registers.f_ctrl,
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sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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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 regs inferior_registers;
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struct fp_state inferior_fp_registers;
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extern char registers[];
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memcpy (&inferior_registers, registers, 20 * 4);
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memcpy (inferior_fp_registers.f_st,
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®isters[REGISTER_BYTE (FP0_REGNUM)],
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sizeof inferior_fp_registers.f_st);
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memcpy (&inferior_fp_registers.f_ctrl,
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®isters[REGISTER_BYTE (FPC_REGNUM)],
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sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
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#ifdef PTRACE_FP_BUG
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if (regno == FP_REGNUM || regno == -1)
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/* Storing the frame pointer requires a gross hack, in which an
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instruction that moves eax into ebp gets single-stepped. */
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{
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int stack = inferior_registers.r_reg[SP_REGNUM];
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int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
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(PTRACE_ARG3_TYPE) stack);
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int reg = inferior_registers.r_reg[EAX];
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inferior_registers.r_reg[EAX] =
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inferior_registers.r_reg[FP_REGNUM];
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ptrace (PTRACE_SETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers);
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ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
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0xc589);
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ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
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0);
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wait (0);
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ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
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stuff);
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inferior_registers.r_reg[EAX] = reg;
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}
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#endif
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ptrace (PTRACE_SETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers);
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ptrace (PTRACE_SETFPREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_fp_registers);
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}
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