[deliverable/binutils-gdb.git] / gdb / symm-tdep.c

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

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.  */

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

#include "defs.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

/* rounds 'one' up to divide evenly by 'two' */

int
round(one,two)
register int one, two;

{
    register int temp;
    temp = (one/two)*two;
    if (one != temp) {
	temp += two;
    }
    return temp;
}


static CORE_ADDR codestream_next_addr;
static CORE_ADDR codestream_addr;
static unsigned char codestream_buf[sizeof (int)];
static int codestream_off;
static int codestream_cnt;

#define codestream_tell() (codestream_addr + codestream_off)
#define codestream_peek() (codestream_cnt == 0 ? \
			   codestream_fill(1): codestream_buf[codestream_off])
#define codestream_get() (codestream_cnt-- == 0 ? \
			 codestream_fill(0) : codestream_buf[codestream_off++])


static unsigned char 
codestream_fill (peek_flag)
{
  codestream_addr = codestream_next_addr;
  codestream_next_addr += sizeof (int);
  codestream_off = 0;
  codestream_cnt = sizeof (int);
  read_memory (codestream_addr,
	       (unsigned char *)codestream_buf,
	       sizeof (int));
  
  if (peek_flag)
    return (codestream_peek());
  else
    return (codestream_get());
}

static void
codestream_seek (place)
{
  codestream_next_addr = place & -sizeof (int);
  codestream_cnt = 0;
  codestream_fill (1);
  while (codestream_tell() != place)
    codestream_get ();
}

static void
codestream_read (buf, count)
     unsigned char *buf;
{
  unsigned char *p;
  int i;
  p = buf;
  for (i = 0; i < count; i++)
    *p++ = codestream_get ();
}

/*
 * Following macro translates i386 opcode register numbers to Symmetry
 * register numbers.  This is used by FRAME_FIND_SAVED_REGS.
 *
 *           %eax  %ecx  %edx  %ebx  %esp  %ebp  %esi  %edi
 * i386        0     1     2     3     4     5     6     7
 * Symmetry    0     2     1     5    14    15     6     7
 *
 */
#define I386_REGNO_TO_SYMMETRY(n) \
((n)==0?0 :(n)==1?2 :(n)==2?1 :(n)==3?5 :(n)==4?14 :(n)==5?15 :(n))

/* from i386-dep.c */
i386_frame_find_saved_regs (fip, fsrp)
     struct frame_info *fip;
     struct frame_saved_regs *fsrp;
{
  unsigned long locals;
  unsigned char *p;
  unsigned char op;
  CORE_ADDR dummy_bottom;
  CORE_ADDR adr;
  int i;
  
  memset (fsrp, 0, sizeof *fsrp);
  
  /* if frame is the end of a dummy, compute where the
   * beginning would be
   */
  dummy_bottom = fip->frame - 4 - NUM_REGS*4 - CALL_DUMMY_LENGTH;
  
  /* check if the PC is in the stack, in a dummy frame */
  if (dummy_bottom <= fip->pc && fip->pc <= fip->frame) 
    {
      /* all regs were saved by push_call_dummy () */
      adr = fip->frame - 4;
      for (i = 0; i < NUM_REGS; i++) 
	{
	  fsrp->regs[i] = adr;
	  adr -= 4;
	}
      return;
    }
  
  locals = i386_get_frame_setup (get_pc_function_start (fip->pc));
  
  if (locals >= 0) 
    {
      adr = fip->frame - 4 - locals;
      for (i = 0; i < 8; i++) 
	{
	  op = codestream_get ();
	  if (op < 0x50 || op > 0x57)
	    break;
	  fsrp->regs[I386_REGNO_TO_SYMMETRY(op - 0x50)] = adr;
	  adr -= 4;
	}
    }
  
  fsrp->regs[PC_REGNUM] = fip->frame + 4;
  fsrp->regs[FP_REGNUM] = fip->frame;
}

static long
i386_get_frame_setup (pc)
{
  unsigned char op;
  
  codestream_seek (pc);
  
  i386_follow_jump ();
  
  op = codestream_get ();
  
  if (op == 0x58) /* popl %eax */
    {
      /*
       * this function must start with
       * 
       *    popl %eax		  0x58
       *    xchgl %eax, (%esp)  0x87 0x04 0x24
       * or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00
       *
       * (the system 5 compiler puts out the second xchg
       * inst, and the assembler doesn't try to optimize it,
       * so the 'sib' form gets generated)
       * 
       * this sequence is used to get the address of the return
       * buffer for a function that returns a structure
       */
      int pos;
      unsigned char buf[4];
      static unsigned char proto1[3] = { 0x87,0x04,0x24 };
      static unsigned char proto2[4] = { 0x87,0x44,0x24,0x00 };
      pos = codestream_tell ();
      codestream_read (buf, 4);
      if (memcmp (buf, proto1, 3) == 0)
	pos += 3;
      else if (memcmp (buf, proto2, 4) == 0)
	pos += 4;
      
      codestream_seek (pos);
      op = codestream_get (); /* update next opcode */
    }
  
  if (op == 0x55) 			/* pushl %esp */
    {
      if (codestream_get () != 0x8b)	/* movl %esp, %ebp (2bytes) */
	return (-1);
      if (codestream_get () != 0xec)
	return (-1);
      /*
       * check for stack adjustment 
       *
       *  subl $XXX, %esp
       *
       * note: you can't subtract a 16 bit immediate
       * from a 32 bit reg, so we don't have to worry
       * about a data16 prefix 
       */
      op = codestream_peek ();
      if (op == 0x83)  /* subl with 8 bit immed */
	{
	  codestream_get ();
	  if (codestream_get () != 0xec)
	    return (-1);
	  /* subl with signed byte immediate 
	   * (though it wouldn't make sense to be negative)
	   */
	  return (codestream_get());
	}
      else if (op == 0x81)  /* subl with 32 bit immed */
	{
	  int locals;
	  if (codestream_get () != 0xec)
	    return (-1);
	  /* subl with 32 bit immediate */
	  codestream_read ((unsigned char *)&locals, 4);
	  return (locals);
	} 
      else 
	{
	  return (0);
	}
    } 
  else if (op == 0xc8) 
    {
      /* enter instruction: arg is 16 unsigned immed */
      unsigned short slocals;
      codestream_read ((unsigned char *)&slocals, 2);
      codestream_get (); /* flush final byte of enter instruction */
      return (slocals);
    }
  return (-1);
}

/* next instruction is a jump, move to target */
static
i386_follow_jump ()
{
  int long_delta;
  short short_delta;
  char byte_delta;
  int data16;
  int pos;
  
  pos = codestream_tell ();
  
  data16 = 0;
  if (codestream_peek () == 0x66)
    {
      codestream_get ();
      data16 = 1;
    }
  
  switch (codestream_get ())
    {
    case 0xe9:
      /* relative jump: if data16 == 0, disp32, else disp16 */
      if (data16)
	{
	  codestream_read ((unsigned char *)&short_delta, 2);
	  pos += short_delta + 3; /* include size of jmp inst */
	}
      else
	{
	  codestream_read ((unsigned char *)&long_delta, 4);
	  pos += long_delta + 5;
	}
      break;
    case 0xeb:
      /* relative jump, disp8 (ignore data16) */
      codestream_read ((unsigned char *)&byte_delta, 1);
      pos += byte_delta + 2;
      break;
    }
  codestream_seek (pos + data16);
}

/* return pc of first real instruction */
/* from i386-dep.c */

i386_skip_prologue (pc)
{
  unsigned char op;
  int i;
  
  if (i386_get_frame_setup (pc) < 0)
    return (pc);
  
  /* found valid frame setup - codestream now points to 
   * start of push instructions for saving registers
   */
  
  /* skip over register saves */
  for (i = 0; i < 8; i++)
    {
      op = codestream_peek ();
      /* break if not pushl inst */
      if (op < 0x50 || op > 0x57) 
	break;
      codestream_get ();
    }
  
  i386_follow_jump ();
  
  return (codestream_tell ());
}

void
symmetry_extract_return_value(type, regbuf, valbuf)
     struct type *type;
     char *regbuf;
     char *valbuf;
{
  union { 
    double	d; 
    int	l[2]; 
  } xd; 
  struct minimal_symbol *msymbol;
  float f;

  if (TYPE_CODE_FLT == TYPE_CODE(type)) { 
    msymbol = lookup_minimal_symbol ("1167_flt", (struct objfile *) NULL);
    if (msymbol != NULL) {
      /* found "1167_flt" means 1167, %fp2-%fp3 */ 
      /* float & double; 19= %fp2, 20= %fp3 */
      /* no single precision on 1167 */
      xd.l[1] = *((int *)&regbuf[REGISTER_BYTE(19)]);
      xd.l[0] = *((int *)&regbuf[REGISTER_BYTE(20)]);
      switch (TYPE_LENGTH(type)) {
      case 4:
	/* FIXME: broken for cross-debugging.  */
	f = (float) xd.d;
	memcpy (valbuf, &f, TYPE_LENGTH(type));
	break;
      case 8:
	/* FIXME: broken for cross-debugging.  */
	memcpy (valbuf, &xd.d, TYPE_LENGTH(type)); 
	break;
      default:
	error("Unknown floating point size");
	break;
      }
    } else { 
      /* 387 %st(0), gcc uses this */ 
      i387_to_double(((int *)&regbuf[REGISTER_BYTE(3)]),
		     &xd.d); 
      switch (TYPE_LENGTH(type)) {
      case 4:			/* float */
	f = (float) xd.d;
	/* FIXME: broken for cross-debugging.  */
	memcpy (valbuf, &f, 4); 
	break;
      case 8:			/* double */
	/* FIXME: broken for cross-debugging.  */
	memcpy (valbuf, &xd.d, 8);
	break;
      default:
	error("Unknown floating point size");
	break;
      }
    }
  } else {
    memcpy (valbuf, regbuf, TYPE_LENGTH (type)); 
  }
}

#ifdef _SEQUENT_ /* ptx, not dynix */
/*
 * Convert compiler register number to gdb internal
 * register number.  The PTX C compiler only really
 * puts things in %edi, %esi and %ebx, but it can't hurt
 * to be complete here.
 */
int
ptx_coff_regno_to_gdb(regno)
     int regno;
{
  return I386_REGNO_TO_SYMMETRY(regno);
}

/* For ptx, the value in blockend will be meaningless.  This function
   merely returns the proper offset given the register number.  This
   is much easier, because under ptx, the upage is set up with the
   user struct on "top", and the registers "beneath" it (and thus defines
   TRAD_CORE_USER_OFFSET in bfd).  */

/* The following table is for ptx 1.3.  In theory it should not change with
   the OS version, but if it does we should (if possible) figure out a way
   to accept both the old and the new formats.  */

static unsigned int reg_offsets[NUM_REGS] = {
/*
 * u.u_ar0 = 0xfffff8d0
 * VA_UBLOCK = 0xffffe000
 * VA_UAREA = 0xfffff8e8
 * struct user at ublock offset 0x18e8
 * registers at ublock offset 0x18d0
 */
0x18d0, /* eax */
0x18c8, /* eax */
0x18cc, /* eax */
0x1be0, /* st0 */
0x1bea, /* st1 */
0x18c4, /* ebx */
0x18b8, /* esi */
0x18b4, /* edi */
0x1bf4, /* st2 */
0x1bfe, /* st3 */
0x1c08, /* st4 */
0x1c12, /* st5 */
0x1c1c, /* st6 */
0x1c26, /* st7 */
0x18e0, /* esp */
0x18bc, /* ebp */
0x18d4, /* eip */
0x18dc, /* flags */
0x1c38, /* fp1 */
0x1c3c, /* fp2 */
0x1c40, /* fp3 */
0x1c44, /* fp4 */
0x1c48, /* fp5 */
0x1c4c, /* fp6 */
0x1c50, /* fp7 */
0x1c54, /* fp8 */
0x1c58, /* fp9 */
0x1c5c, /* fp10 */
0x1c60, /* fp11 */
0x1c64, /* fp12 */
0x1c68, /* fp13 */
0x1c6c, /* fp14 */
0x1c70, /* fp15 */
0x1c74, /* fp16 */
0x1c78, /* fp17 */
0x1c7c, /* fp18 */
0x1c80, /* fp19 */
0x1c84, /* fp20 */
0x1c88, /* fp21 */
0x1c8c, /* fp22 */
0x1c90, /* fp23 */
0x1c94, /* fp24 */
0x1c98, /* fp25 */
0x1c9c, /* fp26 */
0x1ca0, /* fp27 */
0x1ca4, /* fp28 */
0x1ca8, /* fp29 */
0x1cac, /* fp30 */
0x1cb0, /* fp31 */
};

unsigned int
register_addr (regno, blockend)
     int regno, blockend;
{
  if ((regno < 0) || (regno >= NUM_REGS)) {
    error("Invalid register number %d.", regno);
  }
  return reg_offsets[regno];
}
#endif /* _SEQUENT_ */
Commit	Line	Data
07d021a6 JG	1	/* Sequent Symmetry target interface, for GDB when running under Unix.
	2	Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
99a7de40	6	This program is free software; you can redistribute it and/or modify
07d021a6	7	it under the terms of the GNU General Public License as published by
99a7de40 JG	8	the Free Software Foundation; either version 2 of the License, or
99a7de40 JG	9	(at your option) any later version.
07d021a6	10
99a7de40	11	This program is distributed in the hope that it will be useful,
07d021a6 JG	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
99a7de40 JG	17	along with this program; if not, write to the Free Software
99a7de40 JG	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
07d021a6 JG	19
	20	/* many 387-specific items of use taken from i386-dep.c */
	21
07d021a6	22	#include "defs.h"
07d021a6 JG	23	#include "frame.h"
	24	#include "inferior.h"
	25	#include "symtab.h"
	26
	27	#include <signal.h>
	28	#include <sys/param.h>
	29	#include <sys/user.h>
	30	#include <sys/dir.h>
	31	#include <sys/ioctl.h>
	32	#include <sys/stat.h>
	33	#include "gdbcore.h"
	34	#include <fcntl.h>
	35
	36	static long i386_get_frame_setup ();
	37	static i386_follow_jump ();
	38
	39	#include <sgtty.h>
	40	#define TERMINAL struct sgttyb
	41
07d021a6 JG	42	/* rounds 'one' up to divide evenly by 'two' */
	43
	44	int
	45	round(one,two)
	46	register int one, two;
	47
	48	{
	49	register int temp;
	50	temp = (one/two)*two;
	51	if (one != temp) {
	52	temp += two;
	53	}
	54	return temp;
	55	}
	56
	57
	58	static CORE_ADDR codestream_next_addr;
	59	static CORE_ADDR codestream_addr;
	60	static unsigned char codestream_buf[sizeof (int)];
	61	static int codestream_off;
	62	static int codestream_cnt;
	63
	64	#define codestream_tell() (codestream_addr + codestream_off)
	65	#define codestream_peek() (codestream_cnt == 0 ? \
	66	codestream_fill(1): codestream_buf[codestream_off])
	67	#define codestream_get() (codestream_cnt-- == 0 ? \
	68	codestream_fill(0) : codestream_buf[codestream_off++])
	69
	70
	71	static unsigned char
	72	codestream_fill (peek_flag)
	73	{
	74	codestream_addr = codestream_next_addr;
	75	codestream_next_addr += sizeof (int);
	76	codestream_off = 0;
	77	codestream_cnt = sizeof (int);
	78	read_memory (codestream_addr,
	79	(unsigned char *)codestream_buf,
	80	sizeof (int));
	81
	82	if (peek_flag)
	83	return (codestream_peek());
	84	else
	85	return (codestream_get());
	86	}
	87
	88	static void
	89	codestream_seek (place)
	90	{
	91	codestream_next_addr = place & -sizeof (int);
	92	codestream_cnt = 0;
	93	codestream_fill (1);
	94	while (codestream_tell() != place)
	95	codestream_get ();
	96	}
	97
	98	static void
	99	codestream_read (buf, count)
	100	unsigned char *buf;
	101	{
	102	unsigned char *p;
	103	int i;
	104	p = buf;
	105	for (i = 0; i < count; i++)
106	*p++ = codestream_get ();
107	}
108
109	/*
110	* Following macro translates i386 opcode register numbers to Symmetry
111	* register numbers. This is used by FRAME_FIND_SAVED_REGS.
112	*
113	* %eax %ecx %edx %ebx %esp %ebp %esi %edi
114	* i386 0 1 2 3 4 5 6 7
115	* Symmetry 0 2 1 5 14 15 6 7
116	*
117	*/
118	#define I386_REGNO_TO_SYMMETRY(n) \
119	((n)==0?0 :(n)==1?2 :(n)==2?1 :(n)==3?5 :(n)==4?14 :(n)==5?15 :(n))
120
121	/* from i386-dep.c */
122	i386_frame_find_saved_regs (fip, fsrp)
123	struct frame_info *fip;
124	struct frame_saved_regs *fsrp;
125	{
126	unsigned long locals;
127	unsigned char *p;
128	unsigned char op;
129	CORE_ADDR dummy_bottom;
130	CORE_ADDR adr;
131	int i;
132
56eec3c7	133	memset (fsrp, 0, sizeof *fsrp);
07d021a6 JG	134
	135	/* if frame is the end of a dummy, compute where the
	136	* beginning would be
	137	*/
	138	dummy_bottom = fip->frame - 4 - NUM_REGS*4 - CALL_DUMMY_LENGTH;
	139
	140	/* check if the PC is in the stack, in a dummy frame */
	141	if (dummy_bottom <= fip->pc && fip->pc <= fip->frame)
	142	{
	143	/* all regs were saved by push_call_dummy () */
	144	adr = fip->frame - 4;
	145	for (i = 0; i < NUM_REGS; i++)
	146	{
	147	fsrp->regs[i] = adr;
	148	adr -= 4;
	149	}
	150	return;
	151	}
	152
	153	locals = i386_get_frame_setup (get_pc_function_start (fip->pc));
	154
	155	if (locals >= 0)
	156	{
	157	adr = fip->frame - 4 - locals;
	158	for (i = 0; i < 8; i++)
	159	{
	160	op = codestream_get ();
	161	if (op < 0x50 \|\| op > 0x57)
	162	break;
	163	fsrp->regs[I386_REGNO_TO_SYMMETRY(op - 0x50)] = adr;
	164	adr -= 4;
	165	}
	166	}
	167
	168	fsrp->regs[PC_REGNUM] = fip->frame + 4;
	169	fsrp->regs[FP_REGNUM] = fip->frame;
	170	}
	171
	172	static long
	173	i386_get_frame_setup (pc)
	174	{
	175	unsigned char op;
	176
	177	codestream_seek (pc);
	178
	179	i386_follow_jump ();
	180
	181	op = codestream_get ();
	182
	183	if (op == 0x58) /* popl %eax */
	184	{
	185	/*
	186	* this function must start with
	187	*
	188	* popl %eax 0x58
	189	* xchgl %eax, (%esp) 0x87 0x04 0x24
	190	* or xchgl %eax, 0(%esp) 0x87 0x44 0x24 0x00
	191	*
	192	* (the system 5 compiler puts out the second xchg
	193	* inst, and the assembler doesn't try to optimize it,
	194	* so the 'sib' form gets generated)
	195	*
	196	* this sequence is used to get the address of the return
	197	* buffer for a function that returns a structure
198	*/
199	int pos;
200	unsigned char buf[4];
201	static unsigned char proto1[3] = { 0x87,0x04,0x24 };
202	static unsigned char proto2[4] = { 0x87,0x44,0x24,0x00 };
203	pos = codestream_tell ();
204	codestream_read (buf, 4);
56eec3c7	205	if (memcmp (buf, proto1, 3) == 0)
07d021a6	206	pos += 3;
56eec3c7	207	else if (memcmp (buf, proto2, 4) == 0)
07d021a6 JG	208	pos += 4;
	209
	210	codestream_seek (pos);
	211	op = codestream_get (); /* update next opcode */
	212	}
	213
	214	if (op == 0x55) /* pushl %esp */
	215	{
	216	if (codestream_get () != 0x8b) /* movl %esp, %ebp (2bytes) */
	217	return (-1);
	218	if (codestream_get () != 0xec)
	219	return (-1);
	220	/*
	221	* check for stack adjustment
	222	*
	223	* subl $XXX, %esp
	224	*
	225	* note: you can't subtract a 16 bit immediate
	226	* from a 32 bit reg, so we don't have to worry
	227	* about a data16 prefix
	228	*/
	229	op = codestream_peek ();
	230	if (op == 0x83) /* subl with 8 bit immed */
	231	{
	232	codestream_get ();
	233	if (codestream_get () != 0xec)
	234	return (-1);
	235	/* subl with signed byte immediate
	236	* (though it wouldn't make sense to be negative)
	237	*/
	238	return (codestream_get());
	239	}
	240	else if (op == 0x81) /* subl with 32 bit immed */
	241	{
	242	int locals;
	243	if (codestream_get () != 0xec)
	244	return (-1);
	245	/* subl with 32 bit immediate */
	246	codestream_read ((unsigned char *)&locals, 4);
	247	return (locals);
	248	}
	249	else
	250	{
	251	return (0);
	252	}
	253	}
	254	else if (op == 0xc8)
	255	{
	256	/* enter instruction: arg is 16 unsigned immed */
	257	unsigned short slocals;
	258	codestream_read ((unsigned char *)&slocals, 2);
	259	codestream_get (); /* flush final byte of enter instruction */
	260	return (slocals);
	261	}
	262	return (-1);
	263	}
	264
	265	/* next instruction is a jump, move to target */
	266	static
	267	i386_follow_jump ()
	268	{
	269	int long_delta;
	270	short short_delta;
	271	char byte_delta;
272	int data16;
273	int pos;
274
275	pos = codestream_tell ();
276
277	data16 = 0;
278	if (codestream_peek () == 0x66)
279	{
280	codestream_get ();
281	data16 = 1;
282	}
283
284	switch (codestream_get ())
285	{
286	case 0xe9:
287	/* relative jump: if data16 == 0, disp32, else disp16 */
288	if (data16)
289	{
290	codestream_read ((unsigned char *)&short_delta, 2);
291	pos += short_delta + 3; /* include size of jmp inst */
292	}
293	else
294	{
295	codestream_read ((unsigned char *)&long_delta, 4);
296	pos += long_delta + 5;
297	}
298	break;
299	case 0xeb:
300	/* relative jump, disp8 (ignore data16) */
301	codestream_read ((unsigned char *)&byte_delta, 1);
302	pos += byte_delta + 2;
303	break;
304	}
305	codestream_seek (pos + data16);
306	}
307
308	/* return pc of first real instruction */
309	/* from i386-dep.c */
310
311	i386_skip_prologue (pc)
312	{
313	unsigned char op;
314	int i;
315
316	if (i386_get_frame_setup (pc) < 0)
317	return (pc);
318
319	/* found valid frame setup - codestream now points to
320	* start of push instructions for saving registers
321	*/
322
323	/* skip over register saves */
324	for (i = 0; i < 8; i++)
325	{
326	op = codestream_peek ();
327	/* break if not pushl inst */
328	if (op < 0x50 \|\| op > 0x57)
329	break;
330	codestream_get ();
331	}
332
333	i386_follow_jump ();
334
335	return (codestream_tell ());
336	}
337
56eec3c7	338	void
07d021a6 JG	339	symmetry_extract_return_value(type, regbuf, valbuf)
	340	struct type *type;
	341	char *regbuf;
	342	char *valbuf;
	343	{
	344	union {
	345	double d;
	346	int l[2];
	347	} xd;
1ab3bf1b	348	struct minimal_symbol *msymbol;
07d021a6 JG	349	float f;
	350
	351	if (TYPE_CODE_FLT == TYPE_CODE(type)) {
1ab3bf1b JG	352	msymbol = lookup_minimal_symbol ("1167_flt", (struct objfile *) NULL);
1ab3bf1b JG	353	if (msymbol != NULL) {
07d021a6 JG	354	/* found "1167_flt" means 1167, %fp2-%fp3 */
	355	/* float & double; 19= %fp2, 20= %fp3 */
	356	/* no single precision on 1167 */
	357	xd.l[1] = ((int )&regbuf[REGISTER_BYTE(19)]);
	358	xd.l[0] = ((int )&regbuf[REGISTER_BYTE(20)]);
	359	switch (TYPE_LENGTH(type)) {
	360	case 4:
56eec3c7	361	/* FIXME: broken for cross-debugging. */
07d021a6	362	f = (float) xd.d;
56eec3c7	363	memcpy (valbuf, &f, TYPE_LENGTH(type));
07d021a6 JG	364	break;
07d021a6 JG	365	case 8:
56eec3c7 JK	366	/* FIXME: broken for cross-debugging. */
56eec3c7 JK	367	memcpy (valbuf, &xd.d, TYPE_LENGTH(type));
07d021a6 JG	368	break;
	369	default:
	370	error("Unknown floating point size");
	371	break;
	372	}
	373	} else {
	374	/* 387 %st(0), gcc uses this */
	375	i387_to_double(((int *)&regbuf[REGISTER_BYTE(3)]),
	376	&xd.d);
	377	switch (TYPE_LENGTH(type)) {
	378	case 4: /* float */
	379	f = (float) xd.d;
56eec3c7 JK	380	/* FIXME: broken for cross-debugging. */
56eec3c7 JK	381	memcpy (valbuf, &f, 4);
07d021a6 JG	382	break;
07d021a6 JG	383	case 8: /* double */
56eec3c7 JK	384	/* FIXME: broken for cross-debugging. */
56eec3c7 JK	385	memcpy (valbuf, &xd.d, 8);
07d021a6 JG	386	break;
	387	default:
	388	error("Unknown floating point size");
	389	break;
	390	}
	391	}
56eec3c7 JK	392	} else {
	393	memcpy (valbuf, regbuf, TYPE_LENGTH (type));
	394	}
	395	}
	396
	397	#ifdef _SEQUENT_ /* ptx, not dynix */
	398	/*
	399	* Convert compiler register number to gdb internal
	400	* register number. The PTX C compiler only really
	401	* puts things in %edi, %esi and %ebx, but it can't hurt
	402	* to be complete here.
	403	*/
	404	int
	405	ptx_coff_regno_to_gdb(regno)
	406	int regno;
	407	{
	408	return I386_REGNO_TO_SYMMETRY(regno);
	409	}
	410
	411	/* For ptx, the value in blockend will be meaningless. This function
	412	merely returns the proper offset given the register number. This
	413	is much easier, because under ptx, the upage is set up with the
	414	user struct on "top", and the registers "beneath" it (and thus defines
	415	TRAD_CORE_USER_OFFSET in bfd). */
	416
	417	/* The following table is for ptx 1.3. In theory it should not change with
	418	the OS version, but if it does we should (if possible) figure out a way
	419	to accept both the old and the new formats. */
	420
	421	static unsigned int reg_offsets[NUM_REGS] = {
	422	/*
	423	* u.u_ar0 = 0xfffff8d0
	424	* VA_UBLOCK = 0xffffe000
	425	* VA_UAREA = 0xfffff8e8
	426	* struct user at ublock offset 0x18e8
	427	* registers at ublock offset 0x18d0
	428	*/
	429	0x18d0, /* eax */
	430	0x18c8, /* eax */
	431	0x18cc, /* eax */
	432	0x1be0, /* st0 */
	433	0x1bea, /* st1 */
	434	0x18c4, /* ebx */
	435	0x18b8, /* esi */
	436	0x18b4, /* edi */
	437	0x1bf4, /* st2 */
	438	0x1bfe, /* st3 */
	439	0x1c08, /* st4 */
	440	0x1c12, /* st5 */
	441	0x1c1c, /* st6 */
	442	0x1c26, /* st7 */
	443	0x18e0, /* esp */
	444	0x18bc, /* ebp */
	445	0x18d4, /* eip */
	446	0x18dc, /* flags */
	447	0x1c38, /* fp1 */
	448	0x1c3c, /* fp2 */
	449	0x1c40, /* fp3 */
	450	0x1c44, /* fp4 */
	451	0x1c48, /* fp5 */
	452	0x1c4c, /* fp6 */
	453	0x1c50, /* fp7 */
	454	0x1c54, /* fp8 */
	455	0x1c58, /* fp9 */
456	0x1c5c, /* fp10 */
457	0x1c60, /* fp11 */
458	0x1c64, /* fp12 */
459	0x1c68, /* fp13 */
460	0x1c6c, /* fp14 */
461	0x1c70, /* fp15 */
462	0x1c74, /* fp16 */
463	0x1c78, /* fp17 */
464	0x1c7c, /* fp18 */
465	0x1c80, /* fp19 */
466	0x1c84, /* fp20 */
467	0x1c88, /* fp21 */
468	0x1c8c, /* fp22 */
469	0x1c90, /* fp23 */
470	0x1c94, /* fp24 */
471	0x1c98, /* fp25 */
472	0x1c9c, /* fp26 */
473	0x1ca0, /* fp27 */
474	0x1ca4, /* fp28 */
475	0x1ca8, /* fp29 */
476	0x1cac, /* fp30 */
477	0x1cb0, /* fp31 */
478	};
479
480	unsigned int
481	register_addr (regno, blockend)
482	int regno, blockend;
483	{
484	if ((regno < 0) \|\| (regno >= NUM_REGS)) {
485	error("Invalid register number %d.", regno);
07d021a6	486	}
56eec3c7	487	return reg_offsets[regno];
07d021a6	488	}
56eec3c7	489	#endif /* _SEQUENT_ */