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Diffstat (limited to 'gdb/sun386-nat.c')
| -rw-r--r-- | gdb/sun386-nat.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/gdb/sun386-nat.c b/gdb/sun386-nat.c new file mode 100644 index 0000000..1abb4bb --- /dev/null +++ b/gdb/sun386-nat.c @@ -0,0 +1,258 @@ +/* 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; + 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"); +} + +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); +} |