[deliverable/binutils-gdb.git] / gdb / s390-nat.c

/* S390 native-dependent code for GDB, the GNU debugger.
   Copyright 2001 Free Software Foundation, Inc
   Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
   for IBM Deutschland Entwicklung GmbH, IBM Corporation.
   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 "tm.h"
#include "regcache.h"
#include <asm/ptrace.h>
#include <sys/ptrace.h>
#include <asm/processor.h>
#include <sys/procfs.h>
#include <sys/user.h>
#include <value.h>
#include <sys/ucontext.h>
#ifndef offsetof
#define offsetof(type,member) ((size_t) &((type *)0)->member)
#endif


int
s390_register_u_addr (int blockend, int regnum)
{
  int retval;

  if (regnum >= S390_GP0_REGNUM && regnum <= S390_GP_LAST_REGNUM)
    retval = PT_GPR0 + ((regnum - S390_GP0_REGNUM) * S390_GPR_SIZE);
  else if (regnum >= S390_PSWM_REGNUM && regnum <= S390_PC_REGNUM)
    retval = PT_PSWMASK + ((regnum - S390_PSWM_REGNUM) * S390_PSW_MASK_SIZE);
  else if (regnum == S390_FPC_REGNUM)
    retval = PT_FPC;
  else if (regnum >= S390_FP0_REGNUM && regnum <= S390_FPLAST_REGNUM)
    retval =
#if CONFIG_ARCH_S390X
      PT_FPR0
#else
      PT_FPR0_HI
#endif
      + ((regnum - S390_FP0_REGNUM) * S390_FPR_SIZE);
  else if (regnum >= S390_FIRST_ACR && regnum <= S390_LAST_ACR)
    retval = PT_ACR0 + ((regnum - S390_FIRST_ACR) * S390_ACR_SIZE);
  else if (regnum >= (S390_FIRST_CR + 9) && regnum <= (S390_FIRST_CR + 11))
    retval = PT_CR_9 + ((regnum - (S390_FIRST_CR + 9)) * S390_CR_SIZE);
  else
    {
#ifdef GDBSERVER
      error ("s390_register_u_addr invalid regnum %s %d regnum=%d",
             __FILE__, (int) __LINE__, regnum);
#else
      internal_error (__FILE__, __LINE__,
                      "s390_register_u_addr invalid regnum regnum=%d",
                      regnum);
#endif
      retval = 0;
    }
  return retval + blockend;
}

#ifndef GDBSERVER
/* watch_areas are required if you put 2 or more watchpoints on the same 
   address or overlapping areas gdb will call us to delete the watchpoint 
   more than once when we try to delete them.
   attempted reference counting to reduce the number of areas unfortunately
   they didn't shrink when areas had to be split overlapping occurs. */
struct watch_area;
typedef struct watch_area watch_area;
struct watch_area
{
  watch_area *next;
  CORE_ADDR lo_addr;
  CORE_ADDR hi_addr;
};

static watch_area *watch_base = NULL;
int watch_area_cnt = 0;
static CORE_ADDR watch_lo_addr = 0, watch_hi_addr = 0;


CORE_ADDR
s390_stopped_by_watchpoint (int pid)
{
  per_lowcore_bits per_lowcore;
  ptrace_area parea;

  parea.len = sizeof (per_lowcore);
  parea.process_addr = (addr_t) & per_lowcore;
  parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
  ptrace (PTRACE_PEEKUSR_AREA, pid, &parea);
  return ((per_lowcore.perc_storage_alteration == 1) &&
	  (per_lowcore.perc_store_real_address == 0));
}


void
s390_fix_watch_points (int pid)
{
  per_struct per_info;
  ptrace_area parea;

  parea.len = sizeof (per_info);
  parea.process_addr = (addr_t) & per_info;
  parea.kernel_addr = PT_CR_9;
  ptrace (PTRACE_PEEKUSR_AREA, pid, &parea);
  /* The kernel automatically sets the psw for per depending */
  /* on whether the per control registers are set for event recording */
  /* & sets cr9 & cr10 appropriately also */
  if (watch_area_cnt)
    {
      per_info.control_regs.bits.em_storage_alteration = 1;
      per_info.control_regs.bits.storage_alt_space_ctl = 1;
    }
  else
    {
      per_info.control_regs.bits.em_storage_alteration = 0;
      per_info.control_regs.bits.storage_alt_space_ctl = 0;
    }
  per_info.starting_addr = watch_lo_addr;
  per_info.ending_addr = watch_hi_addr;
  ptrace (PTRACE_POKEUSR_AREA, pid, &parea);
}

int
s390_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
{
  CORE_ADDR hi_addr = addr + len - 1;
  watch_area *newarea = (watch_area *) xmalloc (sizeof (watch_area));


  if (newarea)
    {
      newarea->next = watch_base;
      watch_base = newarea;
      watch_lo_addr = min (watch_lo_addr, addr);
      watch_hi_addr = max (watch_hi_addr, hi_addr);
      newarea->lo_addr = addr;
      newarea->hi_addr = hi_addr;
      if (watch_area_cnt == 0)
	{
	  watch_lo_addr = newarea->lo_addr;
	  watch_hi_addr = newarea->hi_addr;
	}
      watch_area_cnt++;
      s390_fix_watch_points (pid);
    }
  return newarea ? 0 : -1;
}


int
s390_remove_watchpoint (int pid, CORE_ADDR addr, int len)
{
  watch_area *curr = watch_base, *prev, *matchCurr;
  CORE_ADDR hi_addr = addr + len - 1;
  CORE_ADDR watch_second_lo_addr = 0xffffffffUL, watch_second_hi_addr = 0;
  int lo_addr_ref_cnt, hi_addr_ref_cnt;
  prev = matchCurr = NULL;
  lo_addr_ref_cnt = (addr == watch_lo_addr);
  hi_addr_ref_cnt = (addr == watch_hi_addr);
  while (curr)
    {
      if (matchCurr == NULL)
	{
	  if (curr->lo_addr == addr && curr->hi_addr == hi_addr)
	    {
	      matchCurr = curr;
	      if (prev)
		prev->next = curr->next;
	      else
		watch_base = curr->next;
	    }
	  prev = curr;
	}
      if (lo_addr_ref_cnt)
	{
	  if (watch_lo_addr == curr->lo_addr)
	    lo_addr_ref_cnt++;
	  if (curr->lo_addr > watch_lo_addr &&
	      curr->lo_addr < watch_second_lo_addr)
	    watch_second_lo_addr = curr->lo_addr;
	}
      if (hi_addr_ref_cnt)
	{
	  if (watch_hi_addr == curr->hi_addr)
	    hi_addr_ref_cnt++;
	  if (curr->hi_addr < watch_hi_addr &&
	      curr->hi_addr > watch_second_hi_addr)
	    watch_second_hi_addr = curr->hi_addr;
	}
      curr = curr->next;
    }
  if (matchCurr)
    {
      xfree (matchCurr);
      watch_area_cnt--;
      if (watch_area_cnt)
	{
	  if (lo_addr_ref_cnt == 2)
	    watch_lo_addr = watch_second_lo_addr;
	  if (hi_addr_ref_cnt == 2)
	    watch_hi_addr = watch_second_hi_addr;
	}
      else
	{
	  watch_lo_addr = watch_hi_addr = 0;
	}
      s390_fix_watch_points (pid);
      return 0;
    }
  else
    {
      fprintf_unfiltered (gdb_stderr,
			  "Attempt to remove nonexistent watchpoint in s390_remove_watchpoint\n");
      return -1;
    }
}

int
kernel_u_size (void)
{
  return sizeof (struct user);
}


#if  (defined (S390_FP0_REGNUM) && defined (HAVE_FPREGSET_T) && defined(HAVE_SYS_PROCFS_H) && defined (HAVE_GREGSET_T))
void
supply_gregset (gregset_t * gregsetp)
{
  int regi;
  greg_t *gregp = (greg_t *) gregsetp;

  supply_register (S390_PSWM_REGNUM, (char *) &gregp[S390_PSWM_REGNUM]);
  supply_register (S390_PC_REGNUM, (char *) &gregp[S390_PC_REGNUM]);
  for (regi = 0; regi < S390_NUM_GPRS; regi++)
    supply_register (S390_GP0_REGNUM + regi,
		     (char *) &gregp[S390_GP0_REGNUM + regi]);
  for (regi = 0; regi < S390_NUM_ACRS; regi++)
    supply_register (S390_FIRST_ACR + regi,
		     (char *) &gregp[S390_FIRST_ACR + regi]);
  /* unfortunately this isn't in gregsetp */
  for (regi = 0; regi < S390_NUM_CRS; regi++)
    supply_register (S390_FIRST_CR + regi, NULL);
}


void
supply_fpregset (fpregset_t * fpregsetp)
{
  int regi;

  supply_register (S390_FPC_REGNUM, (char *) &fpregsetp->fpc);
  for (regi = 0; regi < S390_NUM_FPRS; regi++)
    supply_register (S390_FP0_REGNUM + regi, (char *) &fpregsetp->fprs[regi]);

}

void
fill_gregset (gregset_t * gregsetp, int regno)
{
  int regi;
  greg_t *gregp = (greg_t *) gregsetp;

  if (regno < 0) 
    {
      regcache_collect (S390_PSWM_REGNUM, &gregp[S390_PSWM_REGNUM]);
      regcache_collect (S390_PC_REGNUM, &gregp[S390_PC_REGNUM]);
      for (regi = 0; regi < S390_NUM_GPRS; regi++)
        regcache_collect (S390_GP0_REGNUM + regi,
			  &gregp[S390_GP0_REGNUM + regi]);
      for (regi = 0; regi < S390_NUM_ACRS; regi++)
        regcache_collect (S390_FIRST_ACR + regi,
			  &gregp[S390_FIRST_ACR + regi]);
    }
  else if (regno >= S390_PSWM_REGNUM && regno <= S390_LAST_ACR)
    regcache_collect (regno, &gregp[regno]);
}

/*  Given a pointer to a floating point register set in /proc format
   (fpregset_t *), update the register specified by REGNO from gdb's idea
   of the current floating point register set.  If REGNO is -1, update
   them all. */

void
fill_fpregset (fpregset_t * fpregsetp, int regno)
{
  int regi;

  if (regno < 0) 
    {
      regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc);
      for (regi = 0; regi < S390_NUM_FPRS; regi++)
        regcache_collect (S390_FP0_REGNUM + regi, &fpregsetp->fprs[regi]);
    }
  else if (regno == S390_FPC_REGNUM)
    regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc);
  else if (regno >= S390_FP0_REGNUM && regno <= S390_FPLAST_REGNUM)
    regcache_collect (regno, &fpregsetp->fprs[regno - S390_FP0_REGNUM]);
}


#else
#error "There are a few possibilities here"
#error "1) You aren't compiling for linux & don't need a core dumps to work."
#error "2) The header files sys/elf.h sys/user.h sys/ptrace.h & sys/procfs.h"
#error "libc files are inconsistent with linux/include/asm-s390/"
#error "3) you didn't do a completely clean build & delete config.cache."
#endif
#endif /* GDBSERVER */
Commit	Line	Data
5769d3cd AC	1	/* S390 native-dependent code for GDB, the GNU debugger.
	2	Copyright 2001 Free Software Foundation, Inc
	3	Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
	4	for IBM Deutschland Entwicklung GmbH, IBM Corporation.
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	20	02111-1307, USA. */
	21
	22	#include "defs.h"
	23	#include "tm.h"
3ecc0ae2	24	#include "regcache.h"
5769d3cd AC	25	#include <asm/ptrace.h>
	26	#include <sys/ptrace.h>
	27	#include <asm/processor.h>
	28	#include <sys/procfs.h>
	29	#include <sys/user.h>
	30	#include <value.h>
	31	#include <sys/ucontext.h>
	32	#ifndef offsetof
	33	#define offsetof(type,member) ((size_t) &((type *)0)->member)
	34	#endif
	35
	36
	37	int
	38	s390_register_u_addr (int blockend, int regnum)
	39	{
	40	int retval;
	41
	42	if (regnum >= S390_GP0_REGNUM && regnum <= S390_GP_LAST_REGNUM)
	43	retval = PT_GPR0 + ((regnum - S390_GP0_REGNUM) * S390_GPR_SIZE);
	44	else if (regnum >= S390_PSWM_REGNUM && regnum <= S390_PC_REGNUM)
	45	retval = PT_PSWMASK + ((regnum - S390_PSWM_REGNUM) * S390_PSW_MASK_SIZE);
	46	else if (regnum == S390_FPC_REGNUM)
	47	retval = PT_FPC;
	48	else if (regnum >= S390_FP0_REGNUM && regnum <= S390_FPLAST_REGNUM)
	49	retval =
	50	#if CONFIG_ARCH_S390X
	51	PT_FPR0
	52	#else
	53	PT_FPR0_HI
	54	#endif
	55	+ ((regnum - S390_FP0_REGNUM) * S390_FPR_SIZE);
	56	else if (regnum >= S390_FIRST_ACR && regnum <= S390_LAST_ACR)
	57	retval = PT_ACR0 + ((regnum - S390_FIRST_ACR) * S390_ACR_SIZE);
	58	else if (regnum >= (S390_FIRST_CR + 9) && regnum <= (S390_FIRST_CR + 11))
	59	retval = PT_CR_9 + ((regnum - (S390_FIRST_CR + 9)) * S390_CR_SIZE);
	60	else
	61	{
	62	#ifdef GDBSERVER
e2d46a8c JB	63	error ("s390_register_u_addr invalid regnum %s %d regnum=%d",
e2d46a8c JB	64	__FILE__, (int) __LINE__, regnum);
5769d3cd	65	#else
e2d46a8c JB	66	internal_error (__FILE__, __LINE__,
	67	"s390_register_u_addr invalid regnum regnum=%d",
	68	regnum);
5769d3cd	69	#endif
5769d3cd AC	70	retval = 0;
	71	}
	72	return retval + blockend;
	73	}
	74
	75	#ifndef GDBSERVER
	76	/* watch_areas are required if you put 2 or more watchpoints on the same
	77	address or overlapping areas gdb will call us to delete the watchpoint
	78	more than once when we try to delete them.
	79	attempted reference counting to reduce the number of areas unfortunately
	80	they didn't shrink when areas had to be split overlapping occurs. */
	81	struct watch_area;
	82	typedef struct watch_area watch_area;
	83	struct watch_area
	84	{
	85	watch_area *next;
	86	CORE_ADDR lo_addr;
	87	CORE_ADDR hi_addr;
	88	};
	89
	90	static watch_area *watch_base = NULL;
	91	int watch_area_cnt = 0;
	92	static CORE_ADDR watch_lo_addr = 0, watch_hi_addr = 0;
	93
	94
	95
	96	CORE_ADDR
	97	s390_stopped_by_watchpoint (int pid)
	98	{
	99	per_lowcore_bits per_lowcore;
	100	ptrace_area parea;
	101
	102	parea.len = sizeof (per_lowcore);
	103	parea.process_addr = (addr_t) & per_lowcore;
	104	parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
	105	ptrace (PTRACE_PEEKUSR_AREA, pid, &parea);
	106	return ((per_lowcore.perc_storage_alteration == 1) &&
	107	(per_lowcore.perc_store_real_address == 0));
	108	}
	109
	110
	111	void
	112	s390_fix_watch_points (int pid)
	113	{
	114	per_struct per_info;
	115	ptrace_area parea;
	116
	117	parea.len = sizeof (per_info);
	118	parea.process_addr = (addr_t) & per_info;
	119	parea.kernel_addr = PT_CR_9;
	120	ptrace (PTRACE_PEEKUSR_AREA, pid, &parea);
	121	/* The kernel automatically sets the psw for per depending */
	122	/* on whether the per control registers are set for event recording */
	123	/* & sets cr9 & cr10 appropriately also */
	124	if (watch_area_cnt)
	125	{
	126	per_info.control_regs.bits.em_storage_alteration = 1;
	127	per_info.control_regs.bits.storage_alt_space_ctl = 1;
	128	}
	129	else
	130	{
	131	per_info.control_regs.bits.em_storage_alteration = 0;
	132	per_info.control_regs.bits.storage_alt_space_ctl = 0;
	133	}
134	per_info.starting_addr = watch_lo_addr;
135	per_info.ending_addr = watch_hi_addr;
136	ptrace (PTRACE_POKEUSR_AREA, pid, &parea);
137	}
138
139	int
140	s390_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
141	{
142	CORE_ADDR hi_addr = addr + len - 1;
1de2edba	143	watch_area newarea = (watch_area ) xmalloc (sizeof (watch_area));
5769d3cd AC	144
	145
	146	if (newarea)
	147	{
	148	newarea->next = watch_base;
	149	watch_base = newarea;
	150	watch_lo_addr = min (watch_lo_addr, addr);
	151	watch_hi_addr = max (watch_hi_addr, hi_addr);
	152	newarea->lo_addr = addr;
	153	newarea->hi_addr = hi_addr;
	154	if (watch_area_cnt == 0)
	155	{
	156	watch_lo_addr = newarea->lo_addr;
	157	watch_hi_addr = newarea->hi_addr;
	158	}
	159	watch_area_cnt++;
	160	s390_fix_watch_points (pid);
	161	}
	162	return newarea ? 0 : -1;
	163	}
	164
	165
	166	int
	167	s390_remove_watchpoint (int pid, CORE_ADDR addr, int len)
	168	{
	169	watch_area curr = watch_base, prev, *matchCurr;
	170	CORE_ADDR hi_addr = addr + len - 1;
	171	CORE_ADDR watch_second_lo_addr = 0xffffffffUL, watch_second_hi_addr = 0;
	172	int lo_addr_ref_cnt, hi_addr_ref_cnt;
	173	prev = matchCurr = NULL;
	174	lo_addr_ref_cnt = (addr == watch_lo_addr);
	175	hi_addr_ref_cnt = (addr == watch_hi_addr);
	176	while (curr)
	177	{
	178	if (matchCurr == NULL)
	179	{
	180	if (curr->lo_addr == addr && curr->hi_addr == hi_addr)
	181	{
	182	matchCurr = curr;
	183	if (prev)
	184	prev->next = curr->next;
	185	else
	186	watch_base = curr->next;
	187	}
	188	prev = curr;
	189	}
	190	if (lo_addr_ref_cnt)
	191	{
	192	if (watch_lo_addr == curr->lo_addr)
	193	lo_addr_ref_cnt++;
	194	if (curr->lo_addr > watch_lo_addr &&
	195	curr->lo_addr < watch_second_lo_addr)
	196	watch_second_lo_addr = curr->lo_addr;
	197	}
	198	if (hi_addr_ref_cnt)
	199	{
	200	if (watch_hi_addr == curr->hi_addr)
	201	hi_addr_ref_cnt++;
	202	if (curr->hi_addr < watch_hi_addr &&
	203	curr->hi_addr > watch_second_hi_addr)
	204	watch_second_hi_addr = curr->hi_addr;
	205	}
	206	curr = curr->next;
	207	}
208	if (matchCurr)
209	{
1de2edba	210	xfree (matchCurr);
5769d3cd AC	211	watch_area_cnt--;
	212	if (watch_area_cnt)
	213	{
	214	if (lo_addr_ref_cnt == 2)
	215	watch_lo_addr = watch_second_lo_addr;
	216	if (hi_addr_ref_cnt == 2)
	217	watch_hi_addr = watch_second_hi_addr;
	218	}
	219	else
	220	{
	221	watch_lo_addr = watch_hi_addr = 0;
	222	}
	223	s390_fix_watch_points (pid);
	224	return 0;
	225	}
	226	else
	227	{
	228	fprintf_unfiltered (gdb_stderr,
	229	"Attempt to remove nonexistent watchpoint in s390_remove_watchpoint\n");
	230	return -1;
	231	}
	232	}
	233
	234	int
	235	kernel_u_size (void)
	236	{
	237	return sizeof (struct user);
	238	}
	239
	240
	241	#if (defined (S390_FP0_REGNUM) && defined (HAVE_FPREGSET_T) && defined(HAVE_SYS_PROCFS_H) && defined (HAVE_GREGSET_T))
	242	void
	243	supply_gregset (gregset_t * gregsetp)
	244	{
	245	int regi;
	246	greg_t gregp = (greg_t ) gregsetp;
	247
	248	supply_register (S390_PSWM_REGNUM, (char *) &gregp[S390_PSWM_REGNUM]);
	249	supply_register (S390_PC_REGNUM, (char *) &gregp[S390_PC_REGNUM]);
	250	for (regi = 0; regi < S390_NUM_GPRS; regi++)
	251	supply_register (S390_GP0_REGNUM + regi,
	252	(char *) &gregp[S390_GP0_REGNUM + regi]);
	253	for (regi = 0; regi < S390_NUM_ACRS; regi++)
	254	supply_register (S390_FIRST_ACR + regi,
	255	(char *) &gregp[S390_FIRST_ACR + regi]);
	256	/* unfortunately this isn't in gregsetp */
	257	for (regi = 0; regi < S390_NUM_CRS; regi++)
	258	supply_register (S390_FIRST_CR + regi, NULL);
	259	}
	260
	261
	262	void
	263	supply_fpregset (fpregset_t * fpregsetp)
	264	{
	265	int regi;
	266
	267	supply_register (S390_FPC_REGNUM, (char *) &fpregsetp->fpc);
	268	for (regi = 0; regi < S390_NUM_FPRS; regi++)
	269	supply_register (S390_FP0_REGNUM + regi, (char *) &fpregsetp->fprs[regi]);
	270
	271	}
	272
	273	void
	274	fill_gregset (gregset_t * gregsetp, int regno)
275	{
30413464	276	int regi;
5769d3cd AC	277	greg_t gregp = (greg_t ) gregsetp;
5769d3cd AC	278
30413464 AC	279	if (regno < 0)
	280	{
	281	regcache_collect (S390_PSWM_REGNUM, &gregp[S390_PSWM_REGNUM]);
	282	regcache_collect (S390_PC_REGNUM, &gregp[S390_PC_REGNUM]);
	283	for (regi = 0; regi < S390_NUM_GPRS; regi++)
	284	regcache_collect (S390_GP0_REGNUM + regi,
	285	&gregp[S390_GP0_REGNUM + regi]);
	286	for (regi = 0; regi < S390_NUM_ACRS; regi++)
	287	regcache_collect (S390_FIRST_ACR + regi,
	288	&gregp[S390_FIRST_ACR + regi]);
	289	}
	290	else if (regno >= S390_PSWM_REGNUM && regno <= S390_LAST_ACR)
	291	regcache_collect (regno, &gregp[regno]);
5769d3cd AC	292	}
	293
	294	/* Given a pointer to a floating point register set in /proc format
	295	(fpregset_t *), update the register specified by REGNO from gdb's idea
	296	of the current floating point register set. If REGNO is -1, update
	297	them all. */
	298
	299	void
	300	fill_fpregset (fpregset_t * fpregsetp, int regno)
	301	{
30413464 AC	302	int regi;
	303
	304	if (regno < 0)
	305	{
	306	regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc);
	307	for (regi = 0; regi < S390_NUM_FPRS; regi++)
	308	regcache_collect (S390_FP0_REGNUM + regi, &fpregsetp->fprs[regi]);
	309	}
	310	else if (regno == S390_FPC_REGNUM)
	311	regcache_collect (S390_FPC_REGNUM, &fpregsetp->fpc);
	312	else if (regno >= S390_FP0_REGNUM && regno <= S390_FPLAST_REGNUM)
	313	regcache_collect (regno, &fpregsetp->fprs[regno - S390_FP0_REGNUM]);
5769d3cd AC	314	}
	315
	316
	317	#else
	318	#error "There are a few possibilities here"
	319	#error "1) You aren't compiling for linux & don't need a core dumps to work."
	320	#error "2) The header files sys/elf.h sys/user.h sys/ptrace.h & sys/procfs.h"
	321	#error "libc files are inconsistent with linux/include/asm-s390/"
	322	#error "3) you didn't do a completely clean build & delete config.cache."
	323	#endif
	324	#endif /* GDBSERVER */