/* 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 #include #include #include #include #include #include #include #include #include "gdb_stat.h" #include /* Machine-dependent code which would otherwise be in core.c */ /* Work with core files, for GDB. */ 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 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"); } #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); 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; extern char 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); }