gdb/cxux-nat.c

/* Native support for Motorola 88k running Harris CX/UX.
   Copyright 1988, 1990, 1991, 1992, 1993, 1994 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "frame.h"
#include "inferior.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include "gdbcore.h"
#include <sys/user.h>

#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "symtab.h"

#ifndef USER			/* added to support BCS ptrace_user */
#define USER ptrace_user
#endif
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/file.h>
#include "gdb_stat.h"

#include "symtab.h"
#include "setjmp.h"
#include "value.h"

#include <sys/ptrace.h>

/* CX/UX provides them already, but as word offsets instead of char offsets */
#define SXIP_OFFSET (PT_SXIP * 4)
#define SNIP_OFFSET (PT_SNIP * 4)
#define SFIP_OFFSET (PT_SFIP * 4)
#define PSR_OFFSET  (PT_PSR  * sizeof(int))
#define FPSR_OFFSET (PT_FPSR * sizeof(int))
#define FPCR_OFFSET (PT_FPCR * sizeof(int))

#define XREGADDR(r) (((char *)&u.pt_x0-(char *)&u) + \
                     ((r)-X0_REGNUM)*sizeof(X_REGISTER_RAW_TYPE))

extern int have_symbol_file_p ();

extern jmp_buf stack_jmp;

extern int errno;

void
fetch_inferior_registers (int regno)
{
  register unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  register int i;

  struct USER u;
  unsigned int offset;

  offset = (char *) &u.pt_r0 - (char *) &u;
  regaddr = offset;		/* byte offset to r0; */

/*  offset = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) - KERNEL_U_ADDR; */
  for (regno = 0; regno < PC_REGNUM; regno++)
    {
      /*regaddr = register_addr (regno, offset); */
      /* 88k enhancement  */

      for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
	{
	  *(int *) &buf[i] = ptrace (3, inferior_pid,
				     (PTRACE_ARG3_TYPE) regaddr, 0);
	  regaddr += sizeof (int);
	}
      supply_register (regno, buf);
    }
  /* now load up registers 32-37; special pc registers */
  *(int *) &buf[0] = ptrace (3, inferior_pid,
			     (PTRACE_ARG3_TYPE) PSR_OFFSET, 0);
  supply_register (PSR_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, inferior_pid,
			     (PTRACE_ARG3_TYPE) FPSR_OFFSET, 0);
  supply_register (FPSR_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, inferior_pid,
			     (PTRACE_ARG3_TYPE) FPCR_OFFSET, 0);
  supply_register (FPCR_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, inferior_pid,
			     (PTRACE_ARG3_TYPE) SXIP_OFFSET, 0);
  supply_register (SXIP_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, inferior_pid,
			     (PTRACE_ARG3_TYPE) SNIP_OFFSET, 0);
  supply_register (SNIP_REGNUM, buf);
  *(int *) &buf[0] = ptrace (3, inferior_pid,
			     (PTRACE_ARG3_TYPE) SFIP_OFFSET, 0);
  supply_register (SFIP_REGNUM, buf);

  if (target_is_m88110)
    {
      for (regaddr = XREGADDR (X0_REGNUM), regno = X0_REGNUM;
	   regno < NUM_REGS;
	   regno++, regaddr += 16)
	{
	  X_REGISTER_RAW_TYPE xval;

	  *(int *) &xval.w1 = ptrace (3, inferior_pid,
				      (PTRACE_ARG3_TYPE) regaddr, 0);
	  *(int *) &xval.w2 = ptrace (3, inferior_pid,
				      (PTRACE_ARG3_TYPE) (regaddr + 4), 0);
	  *(int *) &xval.w3 = ptrace (3, inferior_pid,
				      (PTRACE_ARG3_TYPE) (regaddr + 8), 0);
	  *(int *) &xval.w4 = ptrace (3, inferior_pid,
				      (PTRACE_ARG3_TYPE) (regaddr + 12), 0);
	  supply_register (regno, (void *) &xval);
	}
    }
}

/* Store our register values back into the inferior.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */

void
store_inferior_registers (int regno)
{
  register unsigned int regaddr;
  char buf[80];

  struct USER u;

  unsigned int offset = (char *) &u.pt_r0 - (char *) &u;

  regaddr = offset;

  /* Don't try to deal with EXIP_REGNUM or ENIP_REGNUM, because I think either
     svr3 doesn't run on an 88110, or the kernel isolates the different (not
     completely sure this is true, but seems to be.  */
  if (regno >= 0)
    {
      /*      regaddr = register_addr (regno, offset); */
      if (regno < PC_REGNUM)
	{
	  regaddr = offset + regno * sizeof (int);
	  errno = 0;
	  ptrace (6, inferior_pid,
		  (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d", regno);
	      perror_with_name (buf);
	    }
	}
      else if (regno == PSR_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) PSR_OFFSET, read_register (regno));
      else if (regno == FPSR_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) FPSR_OFFSET, read_register (regno));
      else if (regno == FPCR_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) FPCR_OFFSET, read_register (regno));
      else if (regno == SXIP_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register (regno));
      else if (regno == SNIP_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register (regno));
      else if (regno == SFIP_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register (regno));
      else if (target_is_m88110 && regno < NUM_REGS)
	{
	  X_REGISTER_RAW_TYPE xval;

	  read_register_bytes (REGISTER_BYTE (regno), (char *) &xval,
			       sizeof (X_REGISTER_RAW_TYPE));
	  regaddr = XREGADDR (regno);
	  ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, xval.w1);
	  ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr + 4, xval.w2);
	  ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr + 8, xval.w3);
	  ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr + 12, xval.w4);
	}
      else
	printf_unfiltered ("Bad register number for store_inferior routine\n");
    }
  else
    {
      for (regno = 0; regno < PC_REGNUM; regno++)
	{
	  /*      regaddr = register_addr (regno, offset); */
	  errno = 0;
	  regaddr = offset + regno * sizeof (int);
	  ptrace (6, inferior_pid,
		  (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d", regno);
	      perror_with_name (buf);
	    }
	}
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) PSR_OFFSET, read_register (regno));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) FPSR_OFFSET, read_register (regno));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) FPCR_OFFSET, read_register (regno));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register (SXIP_REGNUM));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register (SNIP_REGNUM));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register (SFIP_REGNUM));
      if (target_is_m88110)
	{
	  for (regno = X0_REGNUM; regno < NUM_REGS; regno++)
	    {
	      X_REGISTER_RAW_TYPE xval;

	      read_register_bytes (REGISTER_BYTE (regno), (char *) &xval,
				   sizeof (X_REGISTER_RAW_TYPE));
	      regaddr = XREGADDR (regno);
	      ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, xval.w1);
	      ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) (regaddr + 4), xval.w2);
	      ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) (regaddr + 8), xval.w3);
	      ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) (regaddr + 12), xval.w4);
	    }
	}
    }
}

/* blockend is the address of the end of the user structure */

m88k_register_u_addr (int blockend, int regnum)
{
  struct USER u;
  int ustart = blockend - sizeof (struct USER);

  if (regnum < PSR_REGNUM)
    return (ustart + ((int) &u.pt_r0 - (int) &u) +
	    REGISTER_SIZE * regnum);
  else if (regnum == PSR_REGNUM)
    return (ustart + ((int) &u.pt_psr) - (int) &u);
  else if (regnum == FPSR_REGNUM)
    return (ustart + ((int) &u.pt_fpsr) - (int) &u);
  else if (regnum == FPCR_REGNUM)
    return (ustart + ((int) &u.pt_fpcr) - (int) &u);
  else if (regnum == SXIP_REGNUM)
    return (ustart + SXIP_OFFSET);
  else if (regnum == SNIP_REGNUM)
    return (ustart + SNIP_OFFSET);
  else if (regnum == SFIP_REGNUM)
    return (ustart + SFIP_OFFSET);
  else if (target_is_m88110)
    return (ustart + ((int) &u.pt_x0 - (int) &u) +	/* Must be X register */
	    sizeof (u.pt_x0) * (regnum - X0_REGNUM));
  else
    return (blockend + REGISTER_SIZE * regnum);
}

#ifdef USE_PROC_FS

#include <sys/procfs.h>

/* Prototypes for supply_gregset etc. */
#include "gregset.h"

/*  Given a pointer to a general register set in /proc format (gregset_t *),
   unpack the register contents and supply them as gdb's idea of the current
   register values. */

void
supply_gregset (gregset_t *gregsetp)
{
  register int regi;
  register greg_t *regp = (greg_t *) gregsetp;

  for (regi = 0; regi <= SP_REGNUM; regi++)
    supply_register (regi, (char *) (regp + regi));

  supply_register (SXIP_REGNUM, (char *) (regp + R_XIP));
  supply_register (SNIP_REGNUM, (char *) (regp + R_NIP));
  supply_register (SFIP_REGNUM, (char *) (regp + R_FIP));
  supply_register (PSR_REGNUM, (char *) (regp + R_PSR));
  supply_register (FPSR_REGNUM, (char *) (regp + R_FPSR));
  supply_register (FPCR_REGNUM, (char *) (regp + R_FPCR));
}

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

  for (regi = 0; regi <= R_R31; regi++)
    if ((regno == -1) || (regno == regi))
      *(regp + regi) = *(int *) &registers[REGISTER_BYTE (regi)];

  if ((regno == -1) || (regno == SXIP_REGNUM))
    *(regp + R_XIP) = *(int *) &registers[REGISTER_BYTE (SXIP_REGNUM)];
  if ((regno == -1) || (regno == SNIP_REGNUM))
    *(regp + R_NIP) = *(int *) &registers[REGISTER_BYTE (SNIP_REGNUM)];
  if ((regno == -1) || (regno == SFIP_REGNUM))
    *(regp + R_FIP) = *(int *) &registers[REGISTER_BYTE (SFIP_REGNUM)];
  if ((regno == -1) || (regno == PSR_REGNUM))
    *(regp + R_PSR) = *(int *) &registers[REGISTER_BYTE (PSR_REGNUM)];
  if ((regno == -1) || (regno == FPSR_REGNUM))
    *(regp + R_FPSR) = *(int *) &registers[REGISTER_BYTE (FPSR_REGNUM)];
  if ((regno == -1) || (regno == FPCR_REGNUM))
    *(regp + R_FPCR) = *(int *) &registers[REGISTER_BYTE (FPCR_REGNUM)];
}

#endif /* USE_PROC_FS */

/* This support adds the equivalent of adb's % command.  When
   the `add-shared-symbol-files' command is given, this routine scans 
   the dynamic linker's link map and reads the minimal symbols
   from each shared object file listed in the map. */

struct link_map
{
  unsigned long l_addr;		/* address at which object is mapped */
  char *l_name;			/* full name of loaded object */
  void *l_ld;			/* dynamic structure of object */
  struct link_map *l_next;	/* next link object */
  struct link_map *l_prev;	/* previous link object */
};

#define LINKS_MAP_POINTER "_ld_tail"
#define LIBC_FILE "/usr/lib/libc.so.1"
#define SHARED_OFFSET 0xf0001000

#ifndef PATH_MAX
#define PATH_MAX 1023		/* maximum size of path name on OS */
#endif

void
add_shared_symbol_files (void)
{
  void *desc;
  struct link_map *ld_map, *lm, lms;
  struct minimal_symbol *minsym;
  struct objfile *objfile;
  char *path_name;

  if (!inferior_pid)
    {
      warning ("The program has not yet been started.");
      return;
    }

  objfile = symbol_file_add (LIBC_FILE, 0, NULL, 0, OBJF_READNOW);
  minsym = lookup_minimal_symbol (LINKS_MAP_POINTER, objfile);

  ld_map = (struct link_map *)
    read_memory_integer (((int) SYMBOL_VALUE_ADDRESS (minsym) + SHARED_OFFSET), 4);
  lm = ld_map;
  while (lm)
    {
      int local_errno = 0;

      read_memory ((CORE_ADDR) lm, (char *) &lms, sizeof (struct link_map));
      if (lms.l_name)
	{
	  if (target_read_string ((CORE_ADDR) lms.l_name, &path_name,
				  PATH_MAX, &local_errno))
	    {
	      struct section_addr_info section_addrs;
	      memset (&section_addrs, 0, sizeof (section_addrs));
	      section_addrs.other[0].addr = lms.l_addr;
              section_addrs.other[0].name = ".text";
	      symbol_file_add (path_name, 1, &section_addrs, 0, 0);
	      xfree (path_name);
	    }
	}
      /* traverse links in reverse order so that we get the
         the symbols the user actually gets. */
      lm = lms.l_prev;
    }

  /* Getting new symbols may change our opinion about what is
     frameless.  */
  reinit_frame_cache ();
}

#if defined(_ES_MP)

#include <sys/regset.h>

unsigned int
m88k_harris_core_register_addr (int regno, int reg_ptr)
{
  unsigned int word_offset;

  switch (regno)
    {
    case PSR_REGNUM:
      word_offset = R_EPSR;
      break;
    case FPSR_REGNUM:
      word_offset = R_FPSR;
      break;
    case FPCR_REGNUM:
      word_offset = R_FPCR;
      break;
    case SXIP_REGNUM:
      word_offset = R_EXIP;
      break;
    case SNIP_REGNUM:
      word_offset = R_ENIP;
      break;
    case SFIP_REGNUM:
      word_offset = R_EFIP;
      break;
    default:
      if (regno <= FP_REGNUM)
	word_offset = regno;
      else
	word_offset = ((regno - X0_REGNUM) * 4);
    }
  return (word_offset * 4);
}

#endif /* _ES_MP */

void
_initialize_m88k_nat (void)
{
#ifdef _ES_MP
  /* Enable 88110 support, as we don't support the 88100 under ES/MP.  */

  target_is_m88110 = 1;
#elif defined(_CX_UX)
  /* Determine whether we're running on an 88100 or an 88110.  */
  target_is_m88110 = (sinfo (SYSMACHINE, 0) == SYS5800);
#endif /* _CX_UX */
}

#ifdef _ES_MP
/* Given a pointer to a general register set in /proc format (gregset_t *),
   unpack the register contents and supply them as gdb's idea of the current
   register values. */

void
supply_gregset (gregset_t *gregsetp)
{
  register int regi;
  register greg_t *regp = (greg_t *) gregsetp;

  for (regi = 0; regi < R_R31; regi++)
    {
      supply_register (regi, (char *) (regp + regi));
    }
  supply_register (PSR_REGNUM, (char *) (regp + R_EPSR));
  supply_register (FPSR_REGNUM, (char *) (regp + R_FPSR));
  supply_register (FPCR_REGNUM, (char *) (regp + R_FPCR));
  supply_register (SXIP_REGNUM, (char *) (regp + R_EXIP));
  supply_register (SNIP_REGNUM, (char *) (regp + R_ENIP));
  supply_register (SFIP_REGNUM, (char *) (regp + R_EFIP));
}

/* Given a pointer to a floating point register set in /proc format
   (fpregset_t *), unpack the register contents and supply them as gdb's
   idea of the current floating point register values.  */

void
supply_fpregset (fpregset_t *fpregsetp)
{
  register int regi;
  char *from;

  for (regi = FP0_REGNUM; regi <= FPLAST_REGNUM; regi++)
    {
      from = (char *) &((*fpregsetp)[regi - FP0_REGNUM]);
      supply_register (regi, from);
    }
}

#endif /* _ES_MP */

#ifdef _CX_UX

#include <sys/regset.h>

unsigned int
m88k_harris_core_register_addr (int regno, int reg_ptr)
{
  unsigned int word_offset;

  switch (regno)
    {
    case PSR_REGNUM:
      word_offset = R_PSR;
      break;
    case FPSR_REGNUM:
      word_offset = R_FPSR;
      break;
    case FPCR_REGNUM:
      word_offset = R_FPCR;
      break;
    case SXIP_REGNUM:
      word_offset = R_XIP;
      break;
    case SNIP_REGNUM:
      word_offset = R_NIP;
      break;
    case SFIP_REGNUM:
      word_offset = R_FIP;
      break;
    default:
      if (regno <= FP_REGNUM)
	word_offset = regno;
      else
	word_offset = ((regno - X0_REGNUM) * 4) + R_X0;
    }
  return (word_offset * 4);
}

#endif /* _CX_UX */