path: root/gdb/symm-xdep.c

/* Sequent Symmetry host interface, for GDB when running under Unix.
   Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.

This file is part of GDB.

GDB 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 1, or (at your option)
any later version.

GDB 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 GDB; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* many 387-specific items of use taken from i386-dep.c */

#include <stdio.h>
#include "defs.h"
#include "param.h"
#include "frame.h"
#include "inferior.h"
#include "symtab.h"

#include <signal.h>
#include <sys/param.h>
#include <sys/user.h>
#include <sys/dir.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include "gdbcore.h"
#include <fcntl.h>

static long i386_get_frame_setup ();
static i386_follow_jump ();

#include <sgtty.h>
#define TERMINAL struct sgttyb

store_inferior_registers(regno)
int regno;
{
  struct pt_regset regs;
  int reg_tmp, i;
  extern char registers[];
  
#if 0
  /* PREPARE_TO_STORE deals with this.  */
  if (-1 == regno)
    {
#endif
      regs.pr_eax = *(int *)&registers[REGISTER_BYTE(0)];
      regs.pr_ebx = *(int *)&registers[REGISTER_BYTE(5)];
      regs.pr_ecx = *(int *)&registers[REGISTER_BYTE(2)];
      regs.pr_edx = *(int *)&registers[REGISTER_BYTE(1)];
      regs.pr_esi = *(int *)&registers[REGISTER_BYTE(6)];
      regs.pr_edi = *(int *)&registers[REGISTER_BYTE(7)];
      regs.pr_esp = *(int *)&registers[REGISTER_BYTE(14)];
      regs.pr_ebp = *(int *)&registers[REGISTER_BYTE(15)];
      regs.pr_eip = *(int *)&registers[REGISTER_BYTE(16)];
      regs.pr_flags = *(int *)&registers[REGISTER_BYTE(17)];
      for (i = 0; i < 31; i++) {
	regs.pr_fpa.fpa_regs[i] =
	  *(int *)&registers[REGISTER_BYTE(FP1_REGNUM+i)];
      }
#if 0
    }
  else
    {
      reg_tmp = *(int *)&registers[REGISTER_BYTE(regno)];
      ptrace(XPT_RREGS, inferior_pid, &regs, 0);
      switch (regno)
	{
	case 0:
	  regs.pr_eax = *(int *)&registers[REGISTER_BYTE(0)];
	  break;
	case 5:
	  regs.pr_ebx = *(int *)&registers[REGISTER_BYTE(5)];
	  break;
	case 2:
	  regs.pr_ecx = *(int *)&registers[REGISTER_BYTE(2)];
	  break;
	case 1:
	  regs.pr_edx = *(int *)&registers[REGISTER_BYTE(1)];
	  break;
	case 6:
	  regs.pr_esi = *(int *)&registers[REGISTER_BYTE(6)];
	  break;
	case 7:
	  regs.pr_edi = *(int *)&registers[REGISTER_BYTE(7)];
	  break;
	case 15:
	  regs.pr_ebp = *(int *)&registers[REGISTER_BYTE(15)];
	  break;
	case 14:
	  regs.pr_esp = *(int *)&registers[REGISTER_BYTE(14)];
	  break;
	case 16:
	  regs.pr_eip = *(int *)&registers[REGISTER_BYTE(16)];
	  break;
	case 17:
	  regs.pr_flags = *(int *)&registers[REGISTER_BYTE(17)];
	  break;
	}
    }
#endif /* 0 */
  ptrace(XPT_WREGS, inferior_pid, &regs, 0);
}

void
fetch_inferior_registers()
{
    int i;
    struct pt_regset regs;
    extern char registers[];

    registers_fetched ();
    
    ptrace(XPT_RREGS, inferior_pid, &regs, 0);
    *(int *)&registers[REGISTER_BYTE(0)] = regs.pr_eax;
    *(int *)&registers[REGISTER_BYTE(5)] = regs.pr_ebx;
    *(int *)&registers[REGISTER_BYTE(2)] = regs.pr_ecx;
    *(int *)&registers[REGISTER_BYTE(1)] = regs.pr_edx;
    *(int *)&registers[REGISTER_BYTE(6)] = regs.pr_esi;
    *(int *)&registers[REGISTER_BYTE(7)] = regs.pr_edi;
    *(int *)&registers[REGISTER_BYTE(15)] = regs.pr_ebp;
    *(int *)&registers[REGISTER_BYTE(14)] = regs.pr_esp;
    *(int *)&registers[REGISTER_BYTE(16)] = regs.pr_eip;
    *(int *)&registers[REGISTER_BYTE(17)] = regs.pr_flags;
    for (i = 0; i < FPA_NREGS; i++) {
	*(int *)&registers[REGISTER_BYTE(FP1_REGNUM+i)] = regs.pr_fpa.fpa_regs[i];
    }
    bcopy(regs.pr_fpu.fpu_stack[0], &registers[REGISTER_BYTE(3)], 10);
    bcopy(regs.pr_fpu.fpu_stack[1], &registers[REGISTER_BYTE(4)], 10);
    bcopy(regs.pr_fpu.fpu_stack[2], &registers[REGISTER_BYTE(8)], 10);
    bcopy(regs.pr_fpu.fpu_stack[3], &registers[REGISTER_BYTE(9)], 10);
    bcopy(regs.pr_fpu.fpu_stack[4], &registers[REGISTER_BYTE(10)], 10);
    bcopy(regs.pr_fpu.fpu_stack[5], &registers[REGISTER_BYTE(11)], 10);
    bcopy(regs.pr_fpu.fpu_stack[6], &registers[REGISTER_BYTE(12)], 10);
    bcopy(regs.pr_fpu.fpu_stack[7], &registers[REGISTER_BYTE(13)], 10);
}


/* Work with core dump and executable files, for GDB. 
   This code would be in core.c if it weren't machine-dependent. */

#include "gdbcore.h"

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);
      /* 4.2-style (and perhaps also sysV-style) core dump file.  */
      {
	struct user u;
	int reg_offset;

	val = myread (corechan, &u, sizeof u);
	if (val < 0)
	  perror_with_name (filename);
	data_start = exec_data_start;

	data_end = data_start + NBPG * (u.u_dsize - u.u_tsize);
	stack_start = stack_end - NBPG * u.u_ssize;
	data_offset = NBPG * UPAGES;
	stack_offset = ctob(UPAGES + u.u_dsize - u.u_tsize);
	reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
printf("u.u_tsize= %#x, u.u_dsize= %#x, u.u_ssize= %#x, stack_off= %#x\n",
       u.u_tsize, u.u_dsize, u.u_ssize, stack_offset);

	core_aouthdr.a_magic = 0;

	/* Read the register values out of the core file and store
	   them where `read_register' will find them.  */

	{
	  register int regno;

	  for (regno = 0; regno < NUM_REGS; regno++)
	    {
	      char buf[MAX_REGISTER_RAW_SIZE];

	      val = lseek (corechan, register_addr (regno, reg_offset), 0);
	      if (val < 0)
		perror_with_name (filename);

 	      val = myread (corechan, buf, sizeof buf);
	      if (val < 0)
		perror_with_name (filename);
	      supply_register (regno, buf);
	    }
	}
      }
      if (filename[0] == '/')
	corefile = savestring (filename, strlen (filename));
      else
	{
	  corefile = concat (current_directory, "/", filename);
	}

      set_current_frame(create_new_frame(read_register(FP_REGNUM),
					 read_pc()));
/*      set_current_frame (read_register (FP_REGNUM));*/
      select_frame (get_current_frame (), 0);
      validate_files ();
    }
  else if (from_tty)
    printf ("No core file now.\n");
}

/* from i386-dep.c */
static
print_387_control_word (control)
unsigned short control;
{
  printf ("control 0x%04x: ", control);
  printf ("compute to ");
  switch ((control >> 8) & 3) 
    {
    case 0: printf ("24 bits; "); break;
    case 1: printf ("(bad); "); break;
    case 2: printf ("53 bits; "); break;
    case 3: printf ("64 bits; "); break;
    }
  printf ("round ");
  switch ((control >> 10) & 3) 
    {
    case 0: printf ("NEAREST; "); break;
    case 1: printf ("DOWN; "); break;
    case 2: printf ("UP; "); break;
    case 3: printf ("CHOP; "); break;
    }
  if (control & 0x3f) 
    {
      printf ("mask:");
      if (control & 0x0001) printf (" INVALID");
      if (control & 0x0002) printf (" DENORM");
      if (control & 0x0004) printf (" DIVZ");
      if (control & 0x0008) printf (" OVERF");
      if (control & 0x0010) printf (" UNDERF");
      if (control & 0x0020) printf (" LOS");
      printf (";");
    }
  printf ("\n");
  if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n",
				control & 0xe080);
}

static
print_387_status_word (status)
     unsigned short status;
{
  printf ("status %#04x: ", status);
  if (status & 0xff) {
      printf ("exceptions:");	/* exception names match <machine/fpu.h> */
      if (status & 0x0001) printf (" FLTINV");
      if (status & 0x0002) printf (" FLTDEN");
      if (status & 0x0004) printf (" FLTDIV");
      if (status & 0x0008) printf (" FLTOVF");
      if (status & 0x0010) printf (" FLTUND");
      if (status & 0x0020) printf (" FLTPRE");
      if (status & 0x0040) printf (" FLTSTK");
      printf ("; ");
    }
  printf ("flags: %d%d%d%d; ",
	  (status & 0x4000) != 0,
	  (status & 0x0400) != 0,
	  (status & 0x0200) != 0,
	  (status & 0x0100) != 0);
  
  printf ("top %d\n", (status >> 11) & 7);
}

static
print_fpu_status(ep)
struct pt_regset ep;

{
    int i;
    int bothstatus;
    int top;
    int fpreg;
    unsigned char *p;
    
    printf("80387:");
    if (ep.pr_fpu.fpu_ip == 0) {
	printf(" not in use.\n");
	return;
    } else {
	printf("\n");
    }
    if (ep.pr_fpu.fpu_status != 0) {
	print_387_status_word (ep.pr_fpu.fpu_status);
    }
    print_387_control_word (ep.pr_fpu.fpu_control);
    printf ("last exception: ");
    printf ("opcode 0x%x; ", ep.pr_fpu.fpu_rsvd4);
    printf ("pc 0x%x:0x%x; ", ep.pr_fpu.fpu_cs, ep.pr_fpu.fpu_ip);
    printf ("operand 0x%x:0x%x\n", ep.pr_fpu.fpu_data_offset, ep.pr_fpu.fpu_op_sel);
    
    top = (ep.pr_fpu.fpu_status >> 11) & 7;
    
    printf ("regno  tag  msb              lsb  value\n");
    for (fpreg = 7; fpreg >= 0; fpreg--) 
	{
	    double val;
	    
	    printf ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
	    
	    switch ((ep.pr_fpu.fpu_tag >> (fpreg * 2)) & 3) 
		{
		case 0: printf ("valid "); break;
		case 1: printf ("zero  "); break;
		case 2: printf ("trap  "); break;
		case 3: printf ("empty "); break;
		}
	    for (i = 9; i >= 0; i--)
		printf ("%02x", ep.pr_fpu.fpu_stack[fpreg][i]);
	    
	    i387_to_double (ep.pr_fpu.fpu_stack[fpreg], (char *)&val);
	    printf ("  %g\n", val);
	}
    if (ep.pr_fpu.fpu_rsvd1)
	printf ("warning: rsvd1 is 0x%x\n", ep.pr_fpu.fpu_rsvd1);
    if (ep.pr_fpu.fpu_rsvd2)
	printf ("warning: rsvd2 is 0x%x\n", ep.pr_fpu.fpu_rsvd2);
    if (ep.pr_fpu.fpu_rsvd3)
	printf ("warning: rsvd3 is 0x%x\n", ep.pr_fpu.fpu_rsvd3);
    if (ep.pr_fpu.fpu_rsvd5)
	printf ("warning: rsvd5 is 0x%x\n", ep.pr_fpu.fpu_rsvd5);
}


print_1167_control_word(pcr)
unsigned int pcr;

{
    int pcr_tmp;

    pcr_tmp = pcr & FPA_PCR_MODE;
    printf("\tMODE= %#x; RND= %#x ", pcr_tmp, pcr_tmp & 12);
    switch (pcr_tmp & 12) {
    case 0:
	printf("RN (Nearest Value)");
	break;
    case 1:
	printf("RZ (Zero)");
	break;
    case 2:
	printf("RP (Positive Infinity)");
	break;
    case 3:
	printf("RM (Negative Infinity)");
	break;
    }
    printf("; IRND= %d ", pcr_tmp & 2);
    if (0 == pcr_tmp & 2) {
	printf("(same as RND)\n");
    } else {
	printf("(toward zero)\n");
    }
    pcr_tmp = pcr & FPA_PCR_EM;
    printf("\tEM= %#x", pcr_tmp);
    if (pcr_tmp & FPA_PCR_EM_DM) printf(" DM");
    if (pcr_tmp & FPA_PCR_EM_UOM) printf(" UOM");
    if (pcr_tmp & FPA_PCR_EM_PM) printf(" PM");
    if (pcr_tmp & FPA_PCR_EM_UM) printf(" UM");
    if (pcr_tmp & FPA_PCR_EM_OM) printf(" OM");
    if (pcr_tmp & FPA_PCR_EM_ZM) printf(" ZM");
    if (pcr_tmp & FPA_PCR_EM_IM) printf(" IM");
    printf("\n");
    pcr_tmp = FPA_PCR_CC;
    printf("\tCC= %#x", pcr_tmp);
    if (pcr_tmp & FPA_PCR_20MHZ) printf(" 20MHZ");
    if (pcr_tmp & FPA_PCR_CC_Z) printf(" Z");
    if (pcr_tmp & FPA_PCR_CC_C2) printf(" C2");
    if (pcr_tmp & FPA_PCR_CC_C1) printf(" C1");
    switch (pcr_tmp) {
    case FPA_PCR_CC_Z:
	printf(" (Equal)");
	break;
    case FPA_PCR_CC_C1:
	printf(" (Less than)");
	break;
    case 0:
	printf(" (Greater than)");
	break;
    case FPA_PCR_CC_Z | FPA_PCR_CC_C1 | FPA_PCR_CC_C2:
	printf(" (Unordered)");
	break;
    default:
	printf(" (Undefined)");
	break;
    }
    printf("\n");
    pcr_tmp = pcr & FPA_PCR_AE;
    printf("\tAE= %#x", pcr_tmp);
    if (pcr_tmp & FPA_PCR_AE_DE) printf(" DE");
    if (pcr_tmp & FPA_PCR_AE_UOE) printf(" UOE");
    if (pcr_tmp & FPA_PCR_AE_PE) printf(" PE");
    if (pcr_tmp & FPA_PCR_AE_UE) printf(" UE");
    if (pcr_tmp & FPA_PCR_AE_OE) printf(" OE");
    if (pcr_tmp & FPA_PCR_AE_ZE) printf(" ZE");
    if (pcr_tmp & FPA_PCR_AE_EE) printf(" EE");
    if (pcr_tmp & FPA_PCR_AE_IE) printf(" IE");
    printf("\n");
}

print_1167_regs(regs)
long regs[FPA_NREGS];

{
    int i;

    union {
	double	d;
	long	l[2];
    } xd;
    union {
	float	f;
	long	l;
    } xf;


    for (i = 0; i < FPA_NREGS; i++) {
	xf.l = regs[i];
	printf("%%fp%d: raw= %#x, single= %f", i+1, regs[i], xf.f);
	if (!(i & 1)) {
	    printf("\n");
	} else {
	    xd.l[1] = regs[i];
	    xd.l[0] = regs[i+1];
	    printf(", double= %f\n", xd.d);
	}
    }
}

print_fpa_status(ep)
struct pt_regset ep;

{

    printf("WTL 1167:");
    if (ep.pr_fpa.fpa_pcr !=0) {
	printf("\n");
	print_1167_control_word(ep.pr_fpa.fpa_pcr);
	print_1167_regs(ep.pr_fpa.fpa_regs);
    } else {
	printf(" not in use.\n");
    }
}

i386_float_info ()

{
    char ubuf[UPAGES*NBPG];
    struct pt_regset regset;
    extern int corechan;
    
    if (have_inferior_p()) {
	call_ptrace(XPT_RREGS, inferior_pid, &regset, 0);
    } else {
	if (lseek (corechan, 0, 0) < 0) {
	    perror ("seek on core file");
	}
	if (myread (corechan, ubuf, UPAGES*NBPG) < 0) {
	    perror ("read on core file");
	}
	/* only interested in the floating point registers */
	regset.pr_fpu = ((struct user *) ubuf)->u_fpusave;
	regset.pr_fpa = ((struct user *) ubuf)->u_fpasave;
    }
    print_fpu_status(regset);
    print_fpa_status(regset);
}

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");
}