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/* Native support for the SGI Iris running IRIX version 5, for GDB.

   Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,

   1999, 2000, 2001 Free Software Foundation, Inc.

   Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU

   and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.

   Implemented for Irix 4.x by Garrett A. Wollman.

   Modified for Irix 5.x by Ian Lance Taylor.

   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 "inferior.h"

#include "gdbcore.h"

#include "target.h"

#include "regcache.h"

#include "gdb_string.h"

#include <sys/time.h>

#include <sys/procfs.h>

#include <setjmp.h>             /* For JB_XXX.  */

/* Prototypes for supply_gregset etc. */

#include "gregset.h"

static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);

/* Size of elements in jmpbuf */

#define JB_ELEMENT_SIZE 4

/*

 * See the comment in m68k-tdep.c regarding the utility of these functions.

 *

 * These definitions are from the MIPS SVR4 ABI, so they may work for

 * any MIPS SVR4 target.

 */

void

supply_gregset (gregset_t *gregsetp)

{

  register int regi;

  register greg_t *regp = &(*gregsetp)[0];

  int gregoff = sizeof (greg_t) - MIPS_REGSIZE;

  static char zerobuf[MAX_REGISTER_RAW_SIZE] =

  {0};

  for (regi = 0; regi <= CTX_RA; regi++)

    supply_register (regi, (char *) (regp + regi) + gregoff);

  supply_register (PC_REGNUM, (char *) (regp + CTX_EPC) + gregoff);

  supply_register (HI_REGNUM, (char *) (regp + CTX_MDHI) + gregoff);

  supply_register (LO_REGNUM, (char *) (regp + CTX_MDLO) + gregoff);

  supply_register (CAUSE_REGNUM, (char *) (regp + CTX_CAUSE) + gregoff);

  /* Fill inaccessible registers with zero.  */

  supply_register (BADVADDR_REGNUM, zerobuf);

}

void

fill_gregset (gregset_t *gregsetp, int regno)

{

  int regi;

  register greg_t *regp = &(*gregsetp)[0];

  /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32

     executable, we have to sign extend the registers to 64 bits before

     filling in the gregset structure.  */

  for (regi = 0; regi <= CTX_RA; regi++)

    if ((regno == -1) || (regno == regi))

      *(regp + regi) =

        extract_signed_integer (&registers[REGISTER_BYTE (regi)],

                                REGISTER_RAW_SIZE (regi));

  if ((regno == -1) || (regno == PC_REGNUM))

    *(regp + CTX_EPC) =

      extract_signed_integer (&registers[REGISTER_BYTE (PC_REGNUM)],

                              REGISTER_RAW_SIZE (PC_REGNUM));

  if ((regno == -1) || (regno == CAUSE_REGNUM))

    *(regp + CTX_CAUSE) =

      extract_signed_integer (&registers[REGISTER_BYTE (CAUSE_REGNUM)],

                              REGISTER_RAW_SIZE (CAUSE_REGNUM));

  if ((regno == -1) || (regno == HI_REGNUM))

    *(regp + CTX_MDHI) =

      extract_signed_integer (&registers[REGISTER_BYTE (HI_REGNUM)],

                              REGISTER_RAW_SIZE (HI_REGNUM));

  if ((regno == -1) || (regno == LO_REGNUM))

    *(regp + CTX_MDLO) =

      extract_signed_integer (&registers[REGISTER_BYTE (LO_REGNUM)],

                              REGISTER_RAW_SIZE (LO_REGNUM));

}

/*

 * Now we do the same thing for floating-point registers.

 * We don't bother to condition on FP0_REGNUM since any

 * reasonable MIPS configuration has an R3010 in it.

 *

 * Again, see the comments in m68k-tdep.c.

 */

void

supply_fpregset (fpregset_t *fpregsetp)

{

  register int regi;

  static char zerobuf[MAX_REGISTER_RAW_SIZE] =

  {0};

  /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */

  for (regi = 0; regi < 32; regi++)

    supply_register (FP0_REGNUM + regi,

                     (char *) &fpregsetp->fp_r.fp_regs[regi]);

  supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);

  /* FIXME: how can we supply FCRIR_REGNUM?  SGI doesn't tell us. */

  supply_register (FCRIR_REGNUM, zerobuf);

}

void

fill_fpregset (fpregset_t *fpregsetp, int regno)

{

  int regi;

  char *from, *to;

  /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */

  for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)

    {

      if ((regno == -1) || (regno == regi))

        {

          from = (char *) &registers[REGISTER_BYTE (regi)];

          to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);

          memcpy (to, from, REGISTER_RAW_SIZE (regi));

        }

    }

  if ((regno == -1) || (regno == FCRCS_REGNUM))

    fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];

}

/* Figure out where the longjmp will land.

   We expect the first arg to be a pointer to the jmp_buf structure from which

   we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.

   This routine returns true on success. */

int

get_longjmp_target (CORE_ADDR *pc)

{

  char *buf;

  CORE_ADDR jb_addr;

  buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);

  jb_addr = read_register (A0_REGNUM);

  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,

                          TARGET_PTR_BIT / TARGET_CHAR_BIT))

    return 0;

  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);

  return 1;

}

/* Provide registers to GDB from a core file.

   CORE_REG_SECT points to an array of bytes, which were obtained from

   a core file which BFD thinks might contain register contents.

   CORE_REG_SIZE is its size.

   Normally, WHICH says which register set corelow suspects this is:

     2 --- the floating-point register set

   However, for Irix 5, WHICH isn't used.

   REG_ADDR is also unused.  */

static void

fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,

                      int which, CORE_ADDR reg_addr)

{

  if (core_reg_size == REGISTER_BYTES)

    {

      memcpy ((char *) registers, core_reg_sect, core_reg_size);

    }

  else if (MIPS_REGSIZE == 4 &&

           core_reg_size == (2 * MIPS_REGSIZE) * NUM_REGS)

    {

      /* This is a core file from a N32 executable, 64 bits are saved

         for all registers.  */

      char *srcp = core_reg_sect;

      char *dstp = registers;

      int regno;

      for (regno = 0; regno < NUM_REGS; regno++)

        {

          if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32))

            {

              /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB

                 currently assumes that they are 32 bit.  */

              *dstp++ = *srcp++;

              *dstp++ = *srcp++;

              *dstp++ = *srcp++;

              *dstp++ = *srcp++;

              if (REGISTER_RAW_SIZE (regno) == 4)

                {

                  /* copying 4 bytes from eight bytes?

                     I don't see how this can be right...  */

                  srcp += 4;

                }

              else

                {

                  /* copy all 8 bytes (sizeof(double)) */

                  *dstp++ = *srcp++;

                  *dstp++ = *srcp++;

                  *dstp++ = *srcp++;

                  *dstp++ = *srcp++;

                }

            }

          else

            {

              srcp += 4;

              *dstp++ = *srcp++;

              *dstp++ = *srcp++;

              *dstp++ = *srcp++;

              *dstp++ = *srcp++;

            }

        }

    }

  else

    {

      warning ("wrong size gregset struct in core file");

      return;

    }

  registers_fetched ();

}

/* Irix 5 uses what appears to be a unique form of shared library

   support.  This is a copy of solib.c modified for Irix 5.  */

/* FIXME: Most of this code could be merged with osfsolib.c and solib.c

   by using next_link_map_member and xfer_link_map_member in solib.c.  */

#include <sys/types.h>

#include <signal.h>

#include <sys/param.h>

#include <fcntl.h>

/* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts

   with our versions of those files included by tm-mips.h.  Prevent

   <obj.h> from including them with some appropriate defines.  */

#define __SYM_H__

#define __SYMCONST_H__

#include <obj.h>

#ifdef HAVE_OBJLIST_H

#include <objlist.h>

#endif

#ifdef NEW_OBJ_INFO_MAGIC

#define HANDLE_NEW_OBJ_LIST

#endif

#include "symtab.h"

#include "bfd.h"

#include "symfile.h"

#include "objfiles.h"

#include "command.h"

#include "frame.h"

#include "gdb_regex.h"

#include "inferior.h"

#include "language.h"

#include "gdbcmd.h"

/* The symbol which starts off the list of shared libraries.  */

#define DEBUG_BASE "__rld_obj_head"

/* Irix 6.x introduces a new variant of object lists.

   To be able to debug O32 executables under Irix 6, we have to handle both

   variants.  */

typedef enum

{

  OBJ_LIST_OLD,                 /* Pre Irix 6.x object list.  */

  OBJ_LIST_32,                  /* 32 Bit Elf32_Obj_Info.  */

  OBJ_LIST_64                   /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented.  */

}

obj_list_variant;

/* Define our own link_map structure.

   This will help to share code with osfsolib.c and solib.c.  */

struct link_map

  {

    obj_list_variant l_variant; /* which variant of object list */

    CORE_ADDR l_lladdr;         /* addr in inferior list was read from */

    CORE_ADDR l_next;           /* address of next object list entry */

  };

/* Irix 5 shared objects are pre-linked to particular addresses

   although the dynamic linker may have to relocate them if the

   address ranges of the libraries used by the main program clash.

   The offset is the difference between the address where the object

   is mapped and the binding address of the shared library.  */

#define LM_OFFSET(so) ((so) -> offset)

/* Loaded address of shared library.  */

#define LM_ADDR(so) ((so) -> lmstart)

char shadow_contents[BREAKPOINT_MAX];   /* Stash old bkpt addr contents */

struct so_list

  {

    struct so_list *next;       /* next structure in linked list */

    struct link_map lm;

    CORE_ADDR offset;           /* prelink to load address offset */

    char *so_name;              /* shared object lib name */

    CORE_ADDR lmstart;          /* lower addr bound of mapped object */

    CORE_ADDR lmend;            /* upper addr bound of mapped object */

    char symbols_loaded;        /* flag: symbols read in yet? */

    char from_tty;              /* flag: print msgs? */

    struct objfile *objfile;    /* objfile for loaded lib */

    struct section_table *sections;

    struct section_table *sections_end;

    struct section_table *textsection;

    bfd *abfd;

  };

static struct so_list *so_list_head;    /* List of known shared objects */

static CORE_ADDR debug_base;    /* Base of dynamic linker structures */

static CORE_ADDR breakpoint_addr;       /* Address where end bkpt is set */

/* Local function prototypes */

static void sharedlibrary_command (char *, int);

static int enable_break (void);

static int disable_break (void);

static void info_sharedlibrary_command (char *, int);

static int symbol_add_stub (void *);

static struct so_list *find_solib (struct so_list *);

static struct link_map *first_link_map_member (void);

static struct link_map *next_link_map_member (struct so_list *);

static void xfer_link_map_member (struct so_list *, struct link_map *);

static CORE_ADDR locate_base (void);

static int solib_map_sections (void *);

/*

   LOCAL FUNCTION

   solib_map_sections -- open bfd and build sections for shared lib

   SYNOPSIS

   static int solib_map_sections (struct so_list *so)

   DESCRIPTION

   Given a pointer to one of the shared objects in our list

   of mapped objects, use the recorded name to open a bfd

   descriptor for the object, build a section table, and then

   relocate all the section addresses by the base address at

   which the shared object was mapped.

   FIXMES

   In most (all?) cases the shared object file name recorded in the

   dynamic linkage tables will be a fully qualified pathname.  For

   cases where it isn't, do we really mimic the systems search

   mechanism correctly in the below code (particularly the tilde

   expansion stuff?).

 */

static int

solib_map_sections (void *arg)

{

  struct so_list *so = (struct so_list *) arg;  /* catch_errors bogon */

  char *filename;

  char *scratch_pathname;

  int scratch_chan;

  struct section_table *p;

  struct cleanup *old_chain;

  bfd *abfd;

  filename = tilde_expand (so->so_name);

  old_chain = make_cleanup (xfree, filename);

  scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,

                        &scratch_pathname);

  if (scratch_chan < 0)

    {

      scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,

                            O_RDONLY, 0, &scratch_pathname);

    }

  if (scratch_chan < 0)

    {

      perror_with_name (filename);

    }

  /* Leave scratch_pathname allocated.  abfd->name will point to it.  */

  abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);

  if (!abfd)

    {

      close (scratch_chan);

      error ("Could not open `%s' as an executable file: %s",

             scratch_pathname, bfd_errmsg (bfd_get_error ()));

    }

  /* Leave bfd open, core_xfer_memory and "info files" need it.  */

  so->abfd = abfd;

  abfd->cacheable = true;

  if (!bfd_check_format (abfd, bfd_object))

    {

      error ("\"%s\": not in executable format: %s.",

             scratch_pathname, bfd_errmsg (bfd_get_error ()));

    }

  if (build_section_table (abfd, &so->sections, &so->sections_end))

    {

      error ("Can't find the file sections in `%s': %s",

             bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));

    }

  for (p = so->sections; p < so->sections_end; p++)

    {

      /* Relocate the section binding addresses as recorded in the shared

         object's file by the offset to get the address to which the

         object was actually mapped.  */

      p->addr += LM_OFFSET (so);

      p->endaddr += LM_OFFSET (so);

      so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend);

      if (STREQ (p->the_bfd_section->name, ".text"))

        {

          so->textsection = p;

        }

    }

  /* Free the file names, close the file now.  */

  do_cleanups (old_chain);

  /* must be non-zero */

  return (1);

}

/*

   LOCAL FUNCTION

   locate_base -- locate the base address of dynamic linker structs

   SYNOPSIS

   CORE_ADDR locate_base (void)

   DESCRIPTION

   For both the SunOS and SVR4 shared library implementations, if the

   inferior executable has been linked dynamically, there is a single

   address somewhere in the inferior's data space which is the key to

   locating all of the dynamic linker's runtime structures.  This

   address is the value of the symbol defined by the macro DEBUG_BASE.

   The job of this function is to find and return that address, or to

   return 0 if there is no such address (the executable is statically

   linked for example).

   For SunOS, the job is almost trivial, since the dynamic linker and

   all of it's structures are statically linked to the executable at

   link time.  Thus the symbol for the address we are looking for has

   already been added to the minimal symbol table for the executable's

   objfile at the time the symbol file's symbols were read, and all we

   have to do is look it up there.  Note that we explicitly do NOT want

   to find the copies in the shared library.

   The SVR4 version is much more complicated because the dynamic linker

   and it's structures are located in the shared C library, which gets

   run as the executable's "interpreter" by the kernel.  We have to go

   to a lot more work to discover the address of DEBUG_BASE.  Because

   of this complexity, we cache the value we find and return that value

   on subsequent invocations.  Note there is no copy in the executable

   symbol tables.

   Irix 5 is basically like SunOS.

   Note that we can assume nothing about the process state at the time

   we need to find this address.  We may be stopped on the first instruc-

   tion of the interpreter (C shared library), the first instruction of

   the executable itself, or somewhere else entirely (if we attached

   to the process for example).

 */

static CORE_ADDR

locate_base (void)

{

  struct minimal_symbol *msymbol;

  CORE_ADDR address = 0;

  msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile);

  if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))

    {

      address = SYMBOL_VALUE_ADDRESS (msymbol);

    }

  return (address);

}

/*

   LOCAL FUNCTION

   first_link_map_member -- locate first member in dynamic linker's map

   SYNOPSIS

   static struct link_map *first_link_map_member (void)

   DESCRIPTION

   Read in a copy of the first member in the inferior's dynamic

   link map from the inferior's dynamic linker structures, and return

   a pointer to the link map descriptor.

 */

static struct link_map *

first_link_map_member (void)

{

  struct obj_list *listp;

  struct obj_list list_old;

  struct link_map *lm;

  static struct link_map first_lm;

  CORE_ADDR lladdr;

  CORE_ADDR next_lladdr;

  /* We have not already read in the dynamic linking structures

     from the inferior, lookup the address of the base structure. */

  debug_base = locate_base ();

  if (debug_base == 0)

    return NULL;

  /* Get address of first list entry.  */

  read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *));

  if (listp == NULL)

    return NULL;

  /* Get first list entry.  */

  /* The MIPS Sign extends addresses. */

  lladdr = host_pointer_to_address (listp);

  read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list));

  /* The first entry in the list is the object file we are debugging,

     so skip it.  */

  next_lladdr = host_pointer_to_address (list_old.next);

#ifdef HANDLE_NEW_OBJ_LIST

  if (list_old.data == NEW_OBJ_INFO_MAGIC)

    {

      Elf32_Obj_Info list_32;

      read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info));

      if (list_32.oi_size != sizeof (Elf32_Obj_Info))

        return NULL;

      next_lladdr = (CORE_ADDR) list_32.oi_next;

    }

#endif

  if (next_lladdr == 0)

    return NULL;

  first_lm.l_lladdr = next_lladdr;

  lm = &first_lm;

  return lm;

}

/*

   LOCAL FUNCTION

   next_link_map_member -- locate next member in dynamic linker's map

   SYNOPSIS

   static struct link_map *next_link_map_member (so_list_ptr)

   DESCRIPTION

   Read in a copy of the next member in the inferior's dynamic

   link map from the inferior's dynamic linker structures, and return

   a pointer to the link map descriptor.

 */

static struct link_map *

next_link_map_member (struct so_list *so_list_ptr)

{

  struct link_map *lm = &so_list_ptr->lm;

  CORE_ADDR next_lladdr = lm->l_next;

  static struct link_map next_lm;

  if (next_lladdr == 0)

    {

      /* We have hit the end of the list, so check to see if any were

         added, but be quiet if we can't read from the target any more. */

      int status = 0;

      if (lm->l_variant == OBJ_LIST_OLD)

        {

          struct obj_list list_old;

          status = target_read_memory (lm->l_lladdr,

                                       (char *) &list_old,

                                       sizeof (struct obj_list));

          next_lladdr = host_pointer_to_address (list_old.next);

        }

#ifdef HANDLE_NEW_OBJ_LIST

      else if (lm->l_variant == OBJ_LIST_32)

        {

          Elf32_Obj_Info list_32;

          status = target_read_memory (lm->l_lladdr,

                                       (char *) &list_32,

                                       sizeof (Elf32_Obj_Info));

          next_lladdr = (CORE_ADDR) list_32.oi_next;

        }

#endif

      if (status != 0 || next_lladdr == 0)

        return NULL;

    }

  next_lm.l_lladdr = next_lladdr;

  lm = &next_lm;

  return lm;

}

/*

   LOCAL FUNCTION

   xfer_link_map_member -- set local variables from dynamic linker's map

   SYNOPSIS

   static void xfer_link_map_member (so_list_ptr, lm)

   DESCRIPTION

   Read in a copy of the requested member in the inferior's dynamic

   link map from the inferior's dynamic linker structures, and fill

   in the necessary so_list_ptr elements.

 */

static void

xfer_link_map_member (struct so_list *so_list_ptr, struct link_map *lm)

{

  struct obj_list list_old;

  CORE_ADDR lladdr = lm->l_lladdr;

  struct link_map *new_lm = &so_list_ptr->lm;

  int errcode;

  read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list));

  new_lm->l_variant = OBJ_LIST_OLD;

  new_lm->l_lladdr = lladdr;

  new_lm->l_next = host_pointer_to_address (list_old.next);

#ifdef HANDLE_NEW_OBJ_LIST

  if (list_old.data == NEW_OBJ_INFO_MAGIC)

    {

      Elf32_Obj_Info list_32;

      read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info));

      if (list_32.oi_size != sizeof (Elf32_Obj_Info))

        return;

      new_lm->l_variant = OBJ_LIST_32;

      new_lm->l_next = (CORE_ADDR) list_32.oi_next;

      target_read_string ((CORE_ADDR) list_32.oi_pathname,

                          &so_list_ptr->so_name,

                          list_32.oi_pathname_len + 1, &errcode);

      if (errcode != 0)

        memory_error (errcode, (CORE_ADDR) list_32.oi_pathname);

      LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr;

      LM_OFFSET (so_list_ptr) =

        (CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr;

    }

  else

#endif

    {

#if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32

      /* If we are compiling GDB under N32 ABI, the alignments in

         the obj struct are different from the O32 ABI and we will get

         wrong values when accessing the struct.

         As a workaround we use fixed values which are good for

         Irix 6.2.  */

      char buf[432];