--- /dev/null
+/* Native support for Sun 386i's for GDB, the GNU debugger.
+ Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
+ Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
+ C2V Paris, April 89.
+
+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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#if defined (GDB_TARGET_IS_SUN386)
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/core.h>
+
+\f
+/* Machine-dependent code which would otherwise be in core.c */
+/* Work with core files, for GDB. */
+
+\f
+void
+core_file_command (filename, from_tty)
+ char *filename;
+ int from_tty;
+{
+ int val;
+ extern char registers[];
+
+ /* Discard all vestiges of any previous core file
+ and mark data and stack spaces as empty. */
+
+ if (corefile)
+ free (corefile);
+ corefile = 0;
+
+ if (corechan >= 0)
+ close (corechan);
+ corechan = -1;
+
+ data_start = 0;
+ data_end = 0;
+ stack_start = STACK_END_ADDR;
+ stack_end = STACK_END_ADDR;
+
+ /* Now, if a new core file was specified, open it and digest it. */
+
+ if (filename)
+ {
+ filename = tilde_expand (filename);
+ make_cleanup (free, filename);
+
+ if (have_inferior_p ())
+ error ("To look at a core file, you must kill the inferior with \"kill\".");
+ corechan = open (filename, O_RDONLY, 0);
+ if (corechan < 0)
+ perror_with_name (filename);
+
+ {
+ struct core corestr;
+
+ val = myread (corechan, &corestr, sizeof corestr);
+ if (val < 0)
+ perror_with_name (filename);
+ if (corestr.c_magic != CORE_MAGIC)
+ error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
+ filename, corestr.c_magic, (int) CORE_MAGIC);
+ else if (sizeof (struct core) != corestr.c_len)
+ error ("\"%s\" has an invalid struct core length (%d, expected %d)",
+ filename, corestr.c_len, (int) sizeof (struct core));
+
+ data_start = exec_data_start;
+ data_end = data_start + corestr.c_dsize;
+ stack_start = stack_end - corestr.c_ssize;
+ data_offset = sizeof corestr;
+ stack_offset = sizeof corestr + corestr.c_dsize;
+
+ bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
+
+ bcopy (corestr.c_fpu.f_fpstatus.f_st,
+ ®isters[REGISTER_BYTE (FP0_REGNUM)],
+ sizeof corestr.c_fpu.f_fpstatus.f_st);
+ bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
+ ®isters[REGISTER_BYTE (FPC_REGNUM)],
+ sizeof corestr.c_fpu.f_fpstatus -
+ sizeof corestr.c_fpu.f_fpstatus.f_st);
+
+ /* the struct aouthdr of sun coff is not the struct exec stored
+ in the core file. */
+ bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
+#ifndef COFF_ENCAPSULATE
+ core_aouthdr.magic = corestr.c_aouthdr.a_info;
+ core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
+#endif
+ printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
+ if (corestr.c_signo > 0)
+ printf ("Program terminated with signal %d, %s.\n",
+ corestr.c_signo, safe_strsignal (corestr.c_signo));
+ }
+ if (filename[0] == '/')
+ corefile = savestring (filename, strlen (filename));
+ else
+ {
+ corefile = concat (current_directory, "/", filename, NULL);
+ }
+
+ set_current_frame ( create_new_frame (read_register (FP_REGNUM),
+ read_pc ()));
+ select_frame (get_current_frame (), 0);
+
+ validate_files ();
+ }
+ else if (from_tty)
+ printf ("No core file now.\n");
+}
+
+i387_to_double (from, to)
+ char *from;
+ char *to;
+{
+ long *lp;
+ /* push extended mode on 387 stack, then pop in double mode
+ *
+ * first, set exception masks so no error is generated -
+ * number will be rounded to inf or 0, if necessary
+ */
+ asm ("pushl %eax"); /* grab a stack slot */
+ asm ("fstcw (%esp)"); /* get 387 control word */
+ asm ("movl (%esp),%eax"); /* save old value */
+ asm ("orl $0x3f,%eax"); /* mask all exceptions */
+ asm ("pushl %eax");
+ asm ("fldcw (%esp)"); /* load new value into 387 */
+
+ asm ("movl 8(%ebp),%eax");
+ asm ("fldt (%eax)"); /* push extended number on 387 stack */
+ asm ("fwait");
+ asm ("movl 12(%ebp),%eax");
+ asm ("fstpl (%eax)"); /* pop double */
+ asm ("fwait");
+
+ asm ("popl %eax"); /* flush modified control word */
+ asm ("fnclex"); /* clear exceptions */
+ asm ("fldcw (%esp)"); /* restore original control word */
+ asm ("popl %eax"); /* flush saved copy */
+}
+
+double_to_i387 (from, to)
+ char *from;
+ char *to;
+{
+ /* push double mode on 387 stack, then pop in extended mode
+ * no errors are possible because every 64-bit pattern
+ * can be converted to an extended
+ */
+ asm ("movl 8(%ebp),%eax");
+ asm ("fldl (%eax)");
+ asm ("fwait");
+ asm ("movl 12(%ebp),%eax");
+ asm ("fstpt (%eax)");
+ asm ("fwait");
+}
+#else /* Not sun386 target. */
+
+/* These functions shouldn't be called when we're cross-debugging. */
+
+/* ARGSUSED */
+void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+ char *core_reg_sect;
+ unsigned core_reg_size;
+ int which;
+ unsigned int reg_addr; /* Unused in this version */
+{
+}
+
+#endif /* Not sun386 target. */
+
+void
+fetch_inferior_registers (regno)
+ int regno;
+{
+ struct regs inferior_registers;
+ struct fp_state inferior_fp_registers;
+ extern char registers[];
+
+ registers_fetched ();
+
+ ptrace (PTRACE_GETREGS, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_registers);
+ ptrace (PTRACE_GETFPREGS, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_fp_registers);
+
+ bcopy (&inferior_registers, registers, sizeof inferior_registers);
+
+ bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
+ sizeof inferior_fp_registers.f_st);
+ bcopy (&inferior_fp_registers.f_ctrl,
+ ®isters[REGISTER_BYTE (FPC_REGNUM)],
+ sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
+}
+
+/* Store our register values back into the inferior.
+ If REGNO is -1, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
+
+void
+store_inferior_registers (regno)
+ int regno;
+{
+ struct regs inferior_registers;
+ struct fp_state inferior_fp_registers;
+ extern char registers[];
+
+ bcopy (registers, &inferior_registers, 20 * 4);
+
+ bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
+ sizeof inferior_fp_registers.f_st);
+ bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)],
+ &inferior_fp_registers.f_ctrl,
+ sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
+
+#ifdef PTRACE_FP_BUG
+ if (regno == FP_REGNUM || regno == -1)
+ /* Storing the frame pointer requires a gross hack, in which an
+ instruction that moves eax into ebp gets single-stepped. */
+ {
+ int stack = inferior_registers.r_reg[SP_REGNUM];
+ int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
+ (PTRACE_ARG3_TYPE) stack);
+ int reg = inferior_registers.r_reg[EAX];
+ inferior_registers.r_reg[EAX] =
+ inferior_registers.r_reg[FP_REGNUM];
+ ptrace (PTRACE_SETREGS, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_registers);
+ ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
+ 0xc589);
+ ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
+ 0);
+ wait (0);
+ ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
+ stuff);
+ inferior_registers.r_reg[EAX] = reg;
+ }
+#endif
+ ptrace (PTRACE_SETREGS, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_registers);
+ ptrace (PTRACE_SETFPREGS, inferior_pid,
+ (PTRACE_ARG3_TYPE) &inferior_fp_registers);
+}
+
projects / binutils-gdb.git / commitdiff