494 lines
12 KiB
C
494 lines
12 KiB
C
/* Sequent Symmetry target interface, for GDB when running under Unix.
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Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* many 387-specific items of use taken from i386-dep.c */
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#include <stdio.h>
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#include "defs.h"
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#include "param.h"
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#include "frame.h"
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#include "inferior.h"
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#include "symtab.h"
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#include <signal.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#include <sys/dir.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include "gdbcore.h"
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#include <fcntl.h>
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static long i386_get_frame_setup ();
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static i386_follow_jump ();
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#include <sgtty.h>
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#define TERMINAL struct sgttyb
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exec_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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/* Eliminate all traces of old exec file.
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Mark text segment as empty. */
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if (execfile)
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free (execfile);
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execfile = 0;
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data_start = 0;
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data_end -= exec_data_start;
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text_start = 0;
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text_end = 0;
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exec_data_start = 0;
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exec_data_end = 0;
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if (execchan >= 0)
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close (execchan);
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execchan = -1;
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/* Now open and digest the file the user requested, if any. */
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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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execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
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&execfile);
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if (execchan < 0)
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perror_with_name (filename);
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#ifdef COFF_FORMAT
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{
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int aout_hdrsize;
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int num_sections;
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if (read_file_hdr (execchan, &file_hdr) < 0)
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error ("\"%s\": not in executable format.", execfile);
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aout_hdrsize = file_hdr.f_opthdr;
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num_sections = file_hdr.f_nscns;
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if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0)
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error ("\"%s\": can't read optional aouthdr", execfile);
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if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections,
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aout_hdrsize) < 0)
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error ("\"%s\": can't read text section header", execfile);
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if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections,
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aout_hdrsize) < 0)
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error ("\"%s\": can't read data section header", execfile);
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text_start = exec_aouthdr.text_start;
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text_end = text_start + exec_aouthdr.tsize;
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text_offset = text_hdr.s_scnptr;
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exec_data_start = exec_aouthdr.data_start;
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exec_data_end = exec_data_start + exec_aouthdr.dsize;
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exec_data_offset = data_hdr.s_scnptr;
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data_start = exec_data_start;
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data_end += exec_data_start;
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exec_mtime = file_hdr.f_timdat;
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}
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#else /* not COFF_FORMAT */
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{
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struct stat st_exec;
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val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR));
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if (val < 0)
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perror_with_name (filename);
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text_start = N_ADDRADJ(exec_aouthdr);
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exec_data_start = round(exec_aouthdr.a_text, NBPG*CLSIZE);
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text_offset = N_TXTOFF (exec_aouthdr);
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exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
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text_end = exec_aouthdr.a_text;
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exec_data_end = exec_data_start + exec_aouthdr.a_data;
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data_start = exec_data_start;
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data_end = data_start + exec_aouthdr.a_data;
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exec_data_offset = N_TXTOFF(exec_aouthdr);
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fstat (execchan, &st_exec);
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exec_mtime = st_exec.st_mtime;
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}
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#endif /* not COFF_FORMAT */
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validate_files ();
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}
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else if (from_tty)
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printf ("No exec file now.\n");
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/* Tell display code (if any) about the changed file name. */
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if (exec_file_display_hook)
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(*exec_file_display_hook) (filename);
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}
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/* rounds 'one' up to divide evenly by 'two' */
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int
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round(one,two)
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register int one, two;
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{
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register int temp;
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temp = (one/two)*two;
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if (one != temp) {
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temp += two;
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}
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return temp;
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}
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static CORE_ADDR codestream_next_addr;
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static CORE_ADDR codestream_addr;
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static unsigned char codestream_buf[sizeof (int)];
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static int codestream_off;
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static int codestream_cnt;
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#define codestream_tell() (codestream_addr + codestream_off)
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#define codestream_peek() (codestream_cnt == 0 ? \
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codestream_fill(1): codestream_buf[codestream_off])
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#define codestream_get() (codestream_cnt-- == 0 ? \
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codestream_fill(0) : codestream_buf[codestream_off++])
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static unsigned char
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codestream_fill (peek_flag)
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{
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codestream_addr = codestream_next_addr;
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codestream_next_addr += sizeof (int);
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codestream_off = 0;
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codestream_cnt = sizeof (int);
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read_memory (codestream_addr,
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(unsigned char *)codestream_buf,
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sizeof (int));
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if (peek_flag)
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return (codestream_peek());
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else
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return (codestream_get());
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}
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static void
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codestream_seek (place)
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{
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codestream_next_addr = place & -sizeof (int);
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codestream_cnt = 0;
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codestream_fill (1);
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while (codestream_tell() != place)
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codestream_get ();
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}
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static void
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codestream_read (buf, count)
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unsigned char *buf;
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{
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unsigned char *p;
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int i;
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p = buf;
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for (i = 0; i < count; i++)
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*p++ = codestream_get ();
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}
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/*
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* Following macro translates i386 opcode register numbers to Symmetry
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* register numbers. This is used by FRAME_FIND_SAVED_REGS.
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*
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* %eax %ecx %edx %ebx %esp %ebp %esi %edi
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* i386 0 1 2 3 4 5 6 7
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* Symmetry 0 2 1 5 14 15 6 7
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*
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*/
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#define I386_REGNO_TO_SYMMETRY(n) \
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((n)==0?0 :(n)==1?2 :(n)==2?1 :(n)==3?5 :(n)==4?14 :(n)==5?15 :(n))
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/* from i386-dep.c */
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i386_frame_find_saved_regs (fip, fsrp)
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struct frame_info *fip;
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struct frame_saved_regs *fsrp;
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{
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unsigned long locals;
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unsigned char *p;
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unsigned char op;
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CORE_ADDR dummy_bottom;
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CORE_ADDR adr;
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int i;
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bzero (fsrp, sizeof *fsrp);
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/* if frame is the end of a dummy, compute where the
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* beginning would be
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*/
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dummy_bottom = fip->frame - 4 - NUM_REGS*4 - CALL_DUMMY_LENGTH;
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/* check if the PC is in the stack, in a dummy frame */
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if (dummy_bottom <= fip->pc && fip->pc <= fip->frame)
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{
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/* all regs were saved by push_call_dummy () */
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adr = fip->frame - 4;
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for (i = 0; i < NUM_REGS; i++)
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{
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fsrp->regs[i] = adr;
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adr -= 4;
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}
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return;
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}
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locals = i386_get_frame_setup (get_pc_function_start (fip->pc));
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if (locals >= 0)
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{
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adr = fip->frame - 4 - locals;
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for (i = 0; i < 8; i++)
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{
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op = codestream_get ();
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if (op < 0x50 || op > 0x57)
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break;
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fsrp->regs[I386_REGNO_TO_SYMMETRY(op - 0x50)] = adr;
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adr -= 4;
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}
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}
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fsrp->regs[PC_REGNUM] = fip->frame + 4;
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fsrp->regs[FP_REGNUM] = fip->frame;
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}
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static long
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i386_get_frame_setup (pc)
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{
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unsigned char op;
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codestream_seek (pc);
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i386_follow_jump ();
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op = codestream_get ();
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if (op == 0x58) /* popl %eax */
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{
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/*
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* this function must start with
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*
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* popl %eax 0x58
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* xchgl %eax, (%esp) 0x87 0x04 0x24
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* or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00
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*
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* (the system 5 compiler puts out the second xchg
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* inst, and the assembler doesn't try to optimize it,
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* so the 'sib' form gets generated)
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*
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* this sequence is used to get the address of the return
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* buffer for a function that returns a structure
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*/
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int pos;
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unsigned char buf[4];
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static unsigned char proto1[3] = { 0x87,0x04,0x24 };
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static unsigned char proto2[4] = { 0x87,0x44,0x24,0x00 };
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pos = codestream_tell ();
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codestream_read (buf, 4);
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if (bcmp (buf, proto1, 3) == 0)
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pos += 3;
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else if (bcmp (buf, proto2, 4) == 0)
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pos += 4;
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codestream_seek (pos);
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op = codestream_get (); /* update next opcode */
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}
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if (op == 0x55) /* pushl %esp */
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{
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if (codestream_get () != 0x8b) /* movl %esp, %ebp (2bytes) */
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return (-1);
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if (codestream_get () != 0xec)
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return (-1);
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/*
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* check for stack adjustment
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*
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* subl $XXX, %esp
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*
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* note: you can't subtract a 16 bit immediate
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* from a 32 bit reg, so we don't have to worry
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* about a data16 prefix
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*/
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op = codestream_peek ();
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if (op == 0x83) /* subl with 8 bit immed */
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{
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codestream_get ();
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if (codestream_get () != 0xec)
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return (-1);
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/* subl with signed byte immediate
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* (though it wouldn't make sense to be negative)
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*/
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return (codestream_get());
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}
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else if (op == 0x81) /* subl with 32 bit immed */
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{
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int locals;
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if (codestream_get () != 0xec)
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return (-1);
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/* subl with 32 bit immediate */
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codestream_read ((unsigned char *)&locals, 4);
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return (locals);
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}
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else
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{
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return (0);
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}
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}
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else if (op == 0xc8)
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{
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/* enter instruction: arg is 16 unsigned immed */
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unsigned short slocals;
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codestream_read ((unsigned char *)&slocals, 2);
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codestream_get (); /* flush final byte of enter instruction */
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return (slocals);
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}
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return (-1);
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}
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/* next instruction is a jump, move to target */
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static
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i386_follow_jump ()
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{
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int long_delta;
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short short_delta;
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char byte_delta;
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int data16;
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int pos;
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pos = codestream_tell ();
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data16 = 0;
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if (codestream_peek () == 0x66)
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{
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codestream_get ();
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data16 = 1;
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}
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switch (codestream_get ())
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{
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case 0xe9:
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/* relative jump: if data16 == 0, disp32, else disp16 */
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if (data16)
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{
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codestream_read ((unsigned char *)&short_delta, 2);
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pos += short_delta + 3; /* include size of jmp inst */
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}
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else
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{
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codestream_read ((unsigned char *)&long_delta, 4);
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pos += long_delta + 5;
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}
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break;
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case 0xeb:
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/* relative jump, disp8 (ignore data16) */
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codestream_read ((unsigned char *)&byte_delta, 1);
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pos += byte_delta + 2;
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break;
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}
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codestream_seek (pos + data16);
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}
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/* return pc of first real instruction */
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/* from i386-dep.c */
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i386_skip_prologue (pc)
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{
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unsigned char op;
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int i;
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if (i386_get_frame_setup (pc) < 0)
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return (pc);
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/* found valid frame setup - codestream now points to
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* start of push instructions for saving registers
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*/
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/* skip over register saves */
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for (i = 0; i < 8; i++)
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{
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op = codestream_peek ();
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/* break if not pushl inst */
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if (op < 0x50 || op > 0x57)
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break;
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codestream_get ();
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}
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i386_follow_jump ();
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return (codestream_tell ());
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}
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symmetry_extract_return_value(type, regbuf, valbuf)
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struct type *type;
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char *regbuf;
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char *valbuf;
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{
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union {
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double d;
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int l[2];
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} xd;
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int i;
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float f;
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if (TYPE_CODE_FLT == TYPE_CODE(type)) {
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for (i = 0; i < misc_function_count; i++) {
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if (!strcmp(misc_function_vector[i].name, "1167_flt"))
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break;
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}
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if (i < misc_function_count) {
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/* found "1167_flt" means 1167, %fp2-%fp3 */
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/* float & double; 19= %fp2, 20= %fp3 */
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/* no single precision on 1167 */
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xd.l[1] = *((int *)®buf[REGISTER_BYTE(19)]);
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xd.l[0] = *((int *)®buf[REGISTER_BYTE(20)]);
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switch (TYPE_LENGTH(type)) {
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case 4:
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f = (float) xd.d;
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bcopy(&f, valbuf, TYPE_LENGTH(type));
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break;
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case 8:
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bcopy(&xd.d, valbuf, TYPE_LENGTH(type));
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break;
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default:
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error("Unknown floating point size");
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break;
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}
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} else {
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/* 387 %st(0), gcc uses this */
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i387_to_double(((int *)®buf[REGISTER_BYTE(3)]),
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&xd.d);
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switch (TYPE_LENGTH(type)) {
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case 4: /* float */
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f = (float) xd.d;
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bcopy(&f, valbuf, 4);
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break;
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case 8: /* double */
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bcopy(&xd.d, valbuf, 8);
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break;
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default:
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error("Unknown floating point size");
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break;
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}
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}
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} else {
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bcopy (regbuf, valbuf, TYPE_LENGTH (type));
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}
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}
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