| /* 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #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 "gdb_stat.h" |
| #include <sys/core.h> |
| |
| |
| /* Machine-dependent code which would otherwise be in corefile.c */ |
| /* Work with core files, for GDB. */ |
| |
| |
| void |
| core_file_command (filename, from_tty) |
| char *filename; |
| int from_tty; |
| { |
| int val; |
| |
| /* 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 program 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; |
| |
| memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs); |
| |
| memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], |
| corestr.c_fpu.f_fpstatus.f_st, |
| sizeof corestr.c_fpu.f_fpstatus.f_st); |
| memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], |
| &corestr.c_fpu.f_fpstatus.f_ctrl, |
| 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. */ |
| memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec)); |
| #ifndef COFF_ENCAPSULATE |
| core_aouthdr.magic = corestr.c_aouthdr.a_info; |
| core_aouthdr.vstamp = /*SUNVERSION */ 31252; |
| #endif |
| printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname); |
| if (corestr.c_signo > 0) |
| printf_unfiltered ("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); |
| } |
| |
| flush_cached_frames (); |
| select_frame (get_current_frame (), 0); |
| |
| validate_files (); |
| } |
| else if (from_tty) |
| printf_unfiltered ("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"); |
| } |
| |
| void |
| fetch_inferior_registers (regno) |
| int regno; |
| { |
| struct regs inferior_registers; |
| struct fp_state inferior_fp_registers; |
| |
| registers_fetched (); |
| |
| ptrace (PTRACE_GETREGS, inferior_pid, |
| (PTRACE_ARG3_TYPE) & inferior_registers); |
| ptrace (PTRACE_GETFPREGS, inferior_pid, |
| (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
| |
| memcpy (registers, &inferior_registers, sizeof inferior_registers); |
| |
| memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st, |
| sizeof inferior_fp_registers.f_st); |
| memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], |
| &inferior_fp_registers.f_ctrl, |
| 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; |
| |
| memcpy (&inferior_registers, registers, 20 * 4); |
| |
| memcpy (inferior_fp_registers.f_st, |
| ®isters[REGISTER_BYTE (FP0_REGNUM)], |
| sizeof inferior_fp_registers.f_st); |
| memcpy (&inferior_fp_registers.f_ctrl, |
| ®isters[REGISTER_BYTE (FPC_REGNUM)], |
| 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); |
| } |