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/* Low level interface to SPUs, for the remote server for GDB.
   Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
   Contributed by Ulrich Weigand <uweigand@de.ibm.com>.
 
   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 3 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, see <http://www.gnu.org/licenses/>.  */
 
#include "server.h"
 
#include <sys/wait.h>
#include <stdio.h>
#include <sys/ptrace.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/syscall.h>
 
/* Some older glibc versions do not define this.  */
#ifndef __WNOTHREAD
#define __WNOTHREAD     0x20000000      /* Don't wait on children of other
                                           threads in this group */
#endif
 
#define PTRACE_TYPE_RET long
#define PTRACE_TYPE_ARG3 long
 
/* Number of registers.  */
#define SPU_NUM_REGS         130
#define SPU_NUM_CORE_REGS    128
 
/* Special registers.  */
#define SPU_ID_REGNUM        128
#define SPU_PC_REGNUM        129
 
/* PPU side system calls.  */
#define INSTR_SC        0x44000002
#define NR_spu_run      0x0116
 
/* Get current thread ID (Linux task ID).  */
#define current_ptid ((struct inferior_list_entry *)current_inferior)->id
 
/* These are used in remote-utils.c.  */
int using_threads = 0;
 
/* Defined in auto-generated file reg-spu.c.  */
void init_registers_spu (void);
 
 
/* Fetch PPU register REGNO.  */
static CORE_ADDR
fetch_ppc_register (int regno)
{
  PTRACE_TYPE_RET res;
 
  int tid = ptid_get_lwp (current_ptid);
 
#ifndef __powerpc64__
  /* If running as a 32-bit process on a 64-bit system, we attempt
     to get the full 64-bit register content of the target process.
     If the PPC special ptrace call fails, we're on a 32-bit system;
     just fall through to the regular ptrace call in that case.  */
  {
    char buf[8];
 
    errno = 0;
    ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
            (PTRACE_TYPE_ARG3) (regno * 8), buf);
    if (errno == 0)
      ptrace (PPC_PTRACE_PEEKUSR_3264, tid,
              (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);
    if (errno == 0)
      return (CORE_ADDR) *(unsigned long long *)buf;
  }
#endif
 
  errno = 0;
  res = ptrace (PT_READ_U, tid,
                (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);
  if (errno != 0)
    {
      char mess[128];
      sprintf (mess, "reading PPC register #%d", regno);
      perror_with_name (mess);
    }
 
  return (CORE_ADDR) (unsigned long) res;
}
 
/* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID.  */
static int
fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)
{
  errno = 0;
 
#ifndef __powerpc64__
  if (memaddr >> 32)
    {
      unsigned long long addr_8 = (unsigned long long) memaddr;
      ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
    }
  else
#endif
    *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);
 
  return errno;
}
 
/* Store WORD into PPU memory at (aligned) MEMADDR in thread TID.  */
static int
store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)
{
  errno = 0;
 
#ifndef __powerpc64__
  if (memaddr >> 32)
    {
      unsigned long long addr_8 = (unsigned long long) memaddr;
      ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);
    }
  else
#endif
    ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);
 
  return errno;
}
 
/* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR.  */
static int
fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
{
  int i, ret;
 
  CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
  int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
               / sizeof (PTRACE_TYPE_RET));
  PTRACE_TYPE_RET *buffer;
 
  int tid = ptid_get_lwp (current_ptid);
 
  buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
  for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
    if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0)
      return ret;
 
  memcpy (myaddr,
          (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
          len);
 
  return 0;
}
 
/* Store LEN bytes from MYADDR to PPU memory at MEMADDR.  */
static int
store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
{
  int i, ret;
 
  CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
  int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
               / sizeof (PTRACE_TYPE_RET));
  PTRACE_TYPE_RET *buffer;
 
  int tid = ptid_get_lwp (current_ptid);
 
  buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET));
 
  if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET))
    if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)
      return ret;
 
  if (count > 1)
    if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)
                                               * sizeof (PTRACE_TYPE_RET),
                                   &buffer[count - 1])) != 0)
      return ret;
 
  memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
          myaddr, len);
 
  for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
    if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)
      return ret;
 
  return 0;
}
 
 
/* If the PPU thread is currently stopped on a spu_run system call,
   return to FD and ADDR the file handle and NPC parameter address
   used with the system call.  Return non-zero if successful.  */
static int
parse_spufs_run (int *fd, CORE_ADDR *addr)
{
  char buf[4];
  CORE_ADDR pc = fetch_ppc_register (32);  /* nip */
 
  /* Fetch instruction preceding current NIP.  */
  if (fetch_ppc_memory (pc-4, buf, 4) != 0)
    return 0;
  /* It should be a "sc" instruction.  */
  if (*(unsigned int *)buf != INSTR_SC)
    return 0;
  /* System call number should be NR_spu_run.  */
  if (fetch_ppc_register (0) != NR_spu_run)
    return 0;
 
  /* Register 3 contains fd, register 4 the NPC param pointer.  */
  *fd = fetch_ppc_register (34);  /* orig_gpr3 */
  *addr = fetch_ppc_register (4);
  return 1;
}
 
 
/* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
   using the /proc file system.  */
static int
spu_proc_xfer_spu (const char *annex, unsigned char *readbuf,
                   const unsigned char *writebuf,
                   CORE_ADDR offset, int len)
{
  char buf[128];
  int fd = 0;
  int ret = -1;
 
  if (!annex)
    return 0;
 
  sprintf (buf, "/proc/%ld/fd/%s", ptid_get_lwp (current_ptid), annex);
  fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
  if (fd <= 0)
    return -1;
 
  if (offset != 0
      && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
    {
      close (fd);
      return 0;
    }
 
  if (writebuf)
    ret = write (fd, writebuf, (size_t) len);
  else if (readbuf)
    ret = read (fd, readbuf, (size_t) len);
 
  close (fd);
  return ret;
}
 
 
/* Start an inferior process and returns its pid.
   ALLARGS is a vector of program-name and args. */
static int
spu_create_inferior (char *program, char **allargs)
{
  int pid;
  ptid_t ptid;
 
  pid = fork ();
  if (pid < 0)
    perror_with_name ("fork");
 
  if (pid == 0)
    {
      ptrace (PTRACE_TRACEME, 0, 0, 0);
 
      setpgid (0, 0);
 
      execv (program, allargs);
      if (errno == ENOENT)
        execvp (program, allargs);
 
      fprintf (stderr, "Cannot exec %s: %s.\n", program,
               strerror (errno));
      fflush (stderr);
      _exit (0177);
    }
 
  add_process (pid, 0);
 
  ptid = ptid_build (pid, pid, 0);
  add_thread (ptid, NULL);
  return pid;
}
 
/* Attach to an inferior process.  */
int
spu_attach (unsigned long  pid)
{
  ptid_t ptid;
 
  if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
    {
      fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
               strerror (errno), errno);
      fflush (stderr);
      _exit (0177);
    }
 
  add_process (pid, 1);
  ptid = ptid_build (pid, pid, 0);
  add_thread (ptid, NULL);
  return 0;
}
 
/* Kill the inferior process.  */
static int
spu_kill (int pid)
{
  int status, ret;
  struct process_info *process = find_process_pid (pid);
  if (process == NULL)
    return -1;
 
  ptrace (PTRACE_KILL, pid, 0, 0);
 
  do {
    ret = waitpid (pid, &status, 0);
    if (WIFEXITED (status) || WIFSIGNALED (status))
      break;
  } while (ret != -1 || errno != ECHILD);
 
  clear_inferiors ();
  remove_process (process);
  return 0;
}
 
/* Detach from inferior process.  */
static int
spu_detach (int pid)
{
  struct process_info *process = find_process_pid (pid);
  if (process == NULL)
    return -1;
 
  ptrace (PTRACE_DETACH, pid, 0, 0);
 
  clear_inferiors ();
  remove_process (process);
  return 0;
}
 
static void
spu_mourn (struct process_info *process)
{
  remove_process (process);
}
 
static void
spu_join (int pid)
{
  int status, ret;
  struct process_info *process;
 
  process = find_process_pid (pid);
  if (process == NULL)
    return;
 
  do {
    ret = waitpid (pid, &status, 0);
    if (WIFEXITED (status) || WIFSIGNALED (status))
      break;
  } while (ret != -1 || errno != ECHILD);
}
 
/* Return nonzero if the given thread is still alive.  */
static int
spu_thread_alive (ptid_t ptid)
{
  return ptid_equal (ptid, current_ptid);
}
 
/* Resume process.  */
static void
spu_resume (struct thread_resume *resume_info, size_t n)
{
  size_t i;
 
  for (i = 0; i < n; i++)
    if (ptid_equal (resume_info[i].thread, minus_one_ptid)
        || ptid_equal (resume_info[i].thread, current_ptid))
      break;
 
  if (i == n)
    return;
 
  /* We don't support hardware single-stepping right now, assume
     GDB knows to use software single-stepping.  */
  if (resume_info[i].kind == resume_step)
    fprintf (stderr, "Hardware single-step not supported.\n");
 
  regcache_invalidate ();
 
  errno = 0;
  ptrace (PTRACE_CONT, ptid_get_lwp (current_ptid), 0, resume_info[i].sig);
  if (errno)
    perror_with_name ("ptrace");
}
 
/* Wait for process, returns status.  */
static ptid_t
spu_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
{
  int pid = ptid_get_pid (ptid);
  int w;
  int ret;
 
  while (1)
    {
      ret = waitpid (pid, &w, WNOHANG | __WALL | __WNOTHREAD);
 
      if (ret == -1)
        {
          if (errno != ECHILD)
            perror_with_name ("waitpid");
        }
      else if (ret > 0)
        break;
 
      usleep (1000);
    }
 
  /* On the first wait, continue running the inferior until we are
     blocked inside an spu_run system call.  */
  if (!server_waiting)
    {
      int fd;
      CORE_ADDR addr;
 
      while (!parse_spufs_run (&fd, &addr))
        {
          ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);
          waitpid (pid, NULL, __WALL | __WNOTHREAD);
        }
    }
 
  if (WIFEXITED (w))
    {
      fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
      ourstatus->kind =  TARGET_WAITKIND_EXITED;
      ourstatus->value.integer = WEXITSTATUS (w);
      clear_inferiors ();
      return pid_to_ptid (ret);
    }
  else if (!WIFSTOPPED (w))
    {
      fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
      ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
      ourstatus->value.sig = target_signal_from_host (WTERMSIG (w));
      clear_inferiors ();
      return pid_to_ptid (ret);
    }
 
  /* After attach, we may have received a SIGSTOP.  Do not return this
     as signal to GDB, or else it will try to continue with SIGSTOP ...  */
  if (!server_waiting)
    {
      ourstatus->kind = TARGET_WAITKIND_STOPPED;
      ourstatus->value.sig = TARGET_SIGNAL_0;
      return ptid_build (ret, ret, 0);
    }
 
  ourstatus->kind = TARGET_WAITKIND_STOPPED;
  ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));
  return ptid_build (ret, ret, 0);
}
 
/* Fetch inferior registers.  */
static void
spu_fetch_registers (struct regcache *regcache, int regno)
{
  int fd;
  CORE_ADDR addr;
 
  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (&fd, &addr))
    return;
 
  /* The ID register holds the spufs file handle.  */
  if (regno == -1 || regno == SPU_ID_REGNUM)
    supply_register (regcache, SPU_ID_REGNUM, (char *)&fd);
 
  /* The NPC register is found at ADDR.  */
  if (regno == -1 || regno == SPU_PC_REGNUM)
    {
      char buf[4];
      if (fetch_ppc_memory (addr, buf, 4) == 0)
        supply_register (regcache, SPU_PC_REGNUM, buf);
    }
 
  /* The GPRs are found in the "regs" spufs file.  */
  if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
    {
      unsigned char buf[16*SPU_NUM_CORE_REGS];
      char annex[32];
      int i;
 
      sprintf (annex, "%d/regs", fd);
      if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)
        for (i = 0; i < SPU_NUM_CORE_REGS; i++)
          supply_register (regcache, i, buf + i*16);
    }
}
 
/* Store inferior registers.  */
static void
spu_store_registers (struct regcache *regcache, int regno)
{
  int fd;
  CORE_ADDR addr;
 
  /* ??? Some callers use 0 to mean all registers.  */
  if (regno == 0)
    regno = -1;
 
  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (&fd, &addr))
    return;
 
  /* The NPC register is found at ADDR.  */
  if (regno == -1 || regno == SPU_PC_REGNUM)
    {
      char buf[4];
      collect_register (regcache, SPU_PC_REGNUM, buf);
      store_ppc_memory (addr, buf, 4);
    }
 
  /* The GPRs are found in the "regs" spufs file.  */
  if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
    {
      unsigned char buf[16*SPU_NUM_CORE_REGS];
      char annex[32];
      int i;
 
      for (i = 0; i < SPU_NUM_CORE_REGS; i++)
        collect_register (regcache, i, buf + i*16);
 
      sprintf (annex, "%d/regs", fd);
      spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);
    }
}
 
/* Copy LEN bytes from inferior's memory starting at MEMADDR
   to debugger memory starting at MYADDR.  */
static int
spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
{
  int fd, ret;
  CORE_ADDR addr;
  char annex[32], lslr_annex[32], buf[32];
  CORE_ADDR lslr;
 
  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (&fd, &addr))
    return 0;
 
  /* Use the "mem" spufs file to access SPU local store.  */
  sprintf (annex, "%d/mem", fd);
  ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len);
  if (ret > 0)
    return ret == len ? 0 : EIO;
 
  /* SPU local store access wraps the address around at the
     local store limit.  We emulate this here.  To avoid needing
     an extra access to retrieve the LSLR, we only do that after
     trying the original address first, and getting end-of-file.  */
  sprintf (lslr_annex, "%d/lslr", fd);
  memset (buf, 0, sizeof buf);
  if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,
                         0, sizeof buf) <= 0)
    return ret;
 
  lslr = strtoul (buf, NULL, 16);
  ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr & lslr, len);
 
  return ret == len ? 0 : EIO;
}
 
/* Copy LEN bytes of data from debugger memory at MYADDR
   to inferior's memory at MEMADDR.
   On failure (cannot write the inferior)
   returns the value of errno.  */
static int
spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
{
  int fd, ret;
  CORE_ADDR addr;
  char annex[32], lslr_annex[32], buf[32];
  CORE_ADDR lslr;
 
  /* We must be stopped on a spu_run system call.  */
  if (!parse_spufs_run (&fd, &addr))
    return 0;
 
  /* Use the "mem" spufs file to access SPU local store.  */
  sprintf (annex, "%d/mem", fd);
  ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len);
  if (ret > 0)
    return ret == len ? 0 : EIO;
 
  /* SPU local store access wraps the address around at the
     local store limit.  We emulate this here.  To avoid needing
     an extra access to retrieve the LSLR, we only do that after
     trying the original address first, and getting end-of-file.  */
  sprintf (lslr_annex, "%d/lslr", fd);
  memset (buf, 0, sizeof buf);
  if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,
                         0, sizeof buf) <= 0)
    return ret;
 
  lslr = strtoul (buf, NULL, 16);
  ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr & lslr, len);
 
  return ret == len ? 0 : EIO;
}
 
/* Look up special symbols -- unneded here.  */
static void
spu_look_up_symbols (void)
{
}
 
/* Send signal to inferior.  */
static void
spu_request_interrupt (void)
{
  syscall (SYS_tkill, ptid_get_lwp (current_ptid), SIGINT);
}
 
static struct target_ops spu_target_ops = {
  spu_create_inferior,
  spu_attach,
  spu_kill,
  spu_detach,
  spu_mourn,
  spu_join,
  spu_thread_alive,
  spu_resume,
  spu_wait,
  spu_fetch_registers,
  spu_store_registers,
  spu_read_memory,
  spu_write_memory,
  spu_look_up_symbols,
  spu_request_interrupt,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  spu_proc_xfer_spu,
  hostio_last_error_from_errno,
};
 
void
initialize_low (void)
{
  static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };
 
  set_target_ops (&spu_target_ops);
  set_breakpoint_data (breakpoint, sizeof breakpoint);
  init_registers_spu ();
}

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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.2/] [gdb/] [gdbserver/] [spu-low.c] - Blame information for rev 342

Line No.	Rev	Author	Line
1	330	jeremybenn	`/* Low level interface to SPUs, for the remote server for GDB.`
2			`Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.`
3
4			`Contributed by Ulrich Weigand <uweigand@de.ibm.com>.`
5
6			`This file is part of GDB.`
7
8			`This program is free software; you can redistribute it and/or modify`
9			`it under the terms of the GNU General Public License as published by`
10			`the Free Software Foundation; either version 3 of the License, or`
11			`(at your option) any later version.`
12
13			`This program is distributed in the hope that it will be useful,`
14			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
16			`GNU General Public License for more details.`
17
18			`You should have received a copy of the GNU General Public License`
19			`along with this program. If not, see <http://www.gnu.org/licenses/>. */`
20
21			`#include "server.h"`
22
23			`#include <sys/wait.h>`
24			`#include <stdio.h>`
25			`#include <sys/ptrace.h>`
26			`#include <fcntl.h>`
27			`#include <string.h>`
28			`#include <stdlib.h>`
29			`#include <unistd.h>`
30			`#include <errno.h>`
31			`#include <sys/syscall.h>`
32
33			`/* Some older glibc versions do not define this. */`
34			`#ifndef __WNOTHREAD`
35			`#define __WNOTHREAD 0x20000000 /* Don't wait on children of other`
36			`threads in this group */`
37			`#endif`
38
39			`#define PTRACE_TYPE_RET long`
40			`#define PTRACE_TYPE_ARG3 long`
41
42			`/* Number of registers. */`
43			`#define SPU_NUM_REGS 130`
44			`#define SPU_NUM_CORE_REGS 128`
45
46			`/* Special registers. */`
47			`#define SPU_ID_REGNUM 128`
48			`#define SPU_PC_REGNUM 129`
49
50			`/* PPU side system calls. */`
51			`#define INSTR_SC 0x44000002`
52			`#define NR_spu_run 0x0116`
53
54			`/* Get current thread ID (Linux task ID). */`
55			`#define current_ptid ((struct inferior_list_entry *)current_inferior)->id`
56
57			`/* These are used in remote-utils.c. */`
58			`int using_threads = 0;`
59
60			`/* Defined in auto-generated file reg-spu.c. */`
61			`void init_registers_spu (void);`
62
63
64			`/* Fetch PPU register REGNO. */`
65			`static CORE_ADDR`
66			`fetch_ppc_register (int regno)`
67			`{`
68			`PTRACE_TYPE_RET res;`
69
70			`int tid = ptid_get_lwp (current_ptid);`
71
72			`#ifndef __powerpc64__`
73			`/* If running as a 32-bit process on a 64-bit system, we attempt`
74			`to get the full 64-bit register content of the target process.`
75			`If the PPC special ptrace call fails, we're on a 32-bit system;`
76			`just fall through to the regular ptrace call in that case. */`
77			`{`
78			`char buf[8];`
79
80			`errno = 0;`
81			`ptrace (PPC_PTRACE_PEEKUSR_3264, tid,`
82			`(PTRACE_TYPE_ARG3) (regno * 8), buf);`
83			`if (errno == 0)`
84			`ptrace (PPC_PTRACE_PEEKUSR_3264, tid,`
85			`(PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);`
86			`if (errno == 0)`
87			`return (CORE_ADDR) (unsigned long long )buf;`
88			`}`
89			`#endif`
90
91			`errno = 0;`
92			`res = ptrace (PT_READ_U, tid,`
93			`(PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);`
94			`if (errno != 0)`
95			`{`
96			`char mess[128];`
97			`sprintf (mess, "reading PPC register #%d", regno);`
98			`perror_with_name (mess);`
99			`}`
100
101			`return (CORE_ADDR) (unsigned long) res;`
102			`}`
103
104			`/* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */`
105			`static int`
106			`fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)`
107			`{`
108			`errno = 0;`
109
110			`#ifndef __powerpc64__`
111			`if (memaddr >> 32)`
112			`{`
113			`unsigned long long addr_8 = (unsigned long long) memaddr;`
114			`ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);`
115			`}`
116			`else`
117			`#endif`
118			`*word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);`
119
120			`return errno;`
121			`}`
122
123			`/* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */`
124			`static int`
125			`store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)`
126			`{`
127			`errno = 0;`
128
129			`#ifndef __powerpc64__`
130			`if (memaddr >> 32)`
131			`{`
132			`unsigned long long addr_8 = (unsigned long long) memaddr;`
133			`ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);`
134			`}`
135			`else`
136			`#endif`
137			`ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);`
138
139			`return errno;`
140			`}`
141
142			`/* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */`
143			`static int`
144			`fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)`
145			`{`
146			`int i, ret;`
147
148			`CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);`
149			`int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)`
150			`/ sizeof (PTRACE_TYPE_RET));`
151			`PTRACE_TYPE_RET *buffer;`
152
153			`int tid = ptid_get_lwp (current_ptid);`
154
155			`buffer = (PTRACE_TYPE_RET ) alloca (count sizeof (PTRACE_TYPE_RET));`
156			`for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))`
157			`if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0)`
158			`return ret;`
159
160			`memcpy (myaddr,`
161			`(char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),`
162			`len);`
163
164			`return 0;`
165			`}`
166
167			`/* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */`
168			`static int`
169			`store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)`
170			`{`
171			`int i, ret;`
172
173			`CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);`
174			`int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)`
175			`/ sizeof (PTRACE_TYPE_RET));`
176			`PTRACE_TYPE_RET *buffer;`
177
178			`int tid = ptid_get_lwp (current_ptid);`
179
180			`buffer = (PTRACE_TYPE_RET ) alloca (count sizeof (PTRACE_TYPE_RET));`
181
182			`if (addr != memaddr \|\| len < (int) sizeof (PTRACE_TYPE_RET))`
183			`if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)`
184			`return ret;`
185
186			`if (count > 1)`
187			`if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)`
188			`* sizeof (PTRACE_TYPE_RET),`
189			`&buffer[count - 1])) != 0)`
190			`return ret;`
191
192			`memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),`
193			`myaddr, len);`
194
195			`for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))`
196			`if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)`
197			`return ret;`
198
199			`return 0;`
200			`}`
201
202
203			`/* If the PPU thread is currently stopped on a spu_run system call,`
204			`return to FD and ADDR the file handle and NPC parameter address`
205			`used with the system call. Return non-zero if successful. */`
206			`static int`
207			`parse_spufs_run (int fd, CORE_ADDR addr)`
208			`{`
209			`char buf[4];`
210			`CORE_ADDR pc = fetch_ppc_register (32); /* nip */`
211
212			`/* Fetch instruction preceding current NIP. */`
213			`if (fetch_ppc_memory (pc-4, buf, 4) != 0)`
214			`return 0;`
215			`/* It should be a "sc" instruction. */`
216			`if ((unsigned int )buf != INSTR_SC)`
217			`return 0;`
218			`/* System call number should be NR_spu_run. */`
219			`if (fetch_ppc_register (0) != NR_spu_run)`
220			`return 0;`
221
222			`/* Register 3 contains fd, register 4 the NPC param pointer. */`
223			`fd = fetch_ppc_register (34); / orig_gpr3 */`
224			`*addr = fetch_ppc_register (4);`
225			`return 1;`
226			`}`
227
228
229			`/* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,`
230			`using the /proc file system. */`
231			`static int`
232			`spu_proc_xfer_spu (const char annex, unsigned char readbuf,`
233			`const unsigned char *writebuf,`
234			`CORE_ADDR offset, int len)`
235			`{`
236			`char buf[128];`
237			`int fd = 0;`
238			`int ret = -1;`
239
240			`if (!annex)`
241			`return 0;`
242
243			`sprintf (buf, "/proc/%ld/fd/%s", ptid_get_lwp (current_ptid), annex);`
244			`fd = open (buf, writebuf? O_WRONLY : O_RDONLY);`
245			`if (fd <= 0)`
246			`return -1;`
247
248			`if (offset != 0`
249			`&& lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)`
250			`{`
251			`close (fd);`
252			`return 0;`
253			`}`
254
255			`if (writebuf)`
256			`ret = write (fd, writebuf, (size_t) len);`
257			`else if (readbuf)`
258			`ret = read (fd, readbuf, (size_t) len);`
259
260			`close (fd);`
261			`return ret;`
262			`}`
263
264
265			`/* Start an inferior process and returns its pid.`
266			`ALLARGS is a vector of program-name and args. */`
267			`static int`
268			`spu_create_inferior (char program, char *allargs)`
269			`{`
270			`int pid;`
271			`ptid_t ptid;`
272
273			`pid = fork ();`
274			`if (pid < 0)`
275			`perror_with_name ("fork");`
276
277			`if (pid == 0)`
278			`{`
279			`ptrace (PTRACE_TRACEME, 0, 0, 0);`
280
281			`setpgid (0, 0);`
282
283			`execv (program, allargs);`
284			`if (errno == ENOENT)`
285			`execvp (program, allargs);`
286
287			`fprintf (stderr, "Cannot exec %s: %s.\n", program,`
288			`strerror (errno));`
289			`fflush (stderr);`
290			`_exit (0177);`
291			`}`
292
293			`add_process (pid, 0);`
294
295			`ptid = ptid_build (pid, pid, 0);`
296			`add_thread (ptid, NULL);`
297			`return pid;`
298			`}`
299
300			`/* Attach to an inferior process. */`
301			`int`
302			`spu_attach (unsigned long pid)`
303			`{`
304			`ptid_t ptid;`
305
306			`if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)`
307			`{`
308			`fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,`
309			`strerror (errno), errno);`
310			`fflush (stderr);`
311			`_exit (0177);`
312			`}`
313
314			`add_process (pid, 1);`
315			`ptid = ptid_build (pid, pid, 0);`
316			`add_thread (ptid, NULL);`
317			`return 0;`
318			`}`
319
320			`/* Kill the inferior process. */`
321			`static int`
322			`spu_kill (int pid)`
323			`{`
324			`int status, ret;`
325			`struct process_info *process = find_process_pid (pid);`
326			`if (process == NULL)`
327			`return -1;`
328
329			`ptrace (PTRACE_KILL, pid, 0, 0);`
330
331			`do {`
332			`ret = waitpid (pid, &status, 0);`
333			`if (WIFEXITED (status) \|\| WIFSIGNALED (status))`
334			`break;`
335			`} while (ret != -1 \|\| errno != ECHILD);`
336
337			`clear_inferiors ();`
338			`remove_process (process);`
339			`return 0;`
340			`}`
341
342			`/* Detach from inferior process. */`
343			`static int`
344			`spu_detach (int pid)`
345			`{`
346			`struct process_info *process = find_process_pid (pid);`
347			`if (process == NULL)`
348			`return -1;`
349
350			`ptrace (PTRACE_DETACH, pid, 0, 0);`
351
352			`clear_inferiors ();`
353			`remove_process (process);`
354			`return 0;`
355			`}`
356
357			`static void`
358			`spu_mourn (struct process_info *process)`
359			`{`
360			`remove_process (process);`
361			`}`
362
363			`static void`
364			`spu_join (int pid)`
365			`{`
366			`int status, ret;`
367			`struct process_info *process;`
368
369			`process = find_process_pid (pid);`
370			`if (process == NULL)`
371			`return;`
372
373			`do {`
374			`ret = waitpid (pid, &status, 0);`
375			`if (WIFEXITED (status) \|\| WIFSIGNALED (status))`
376			`break;`
377			`} while (ret != -1 \|\| errno != ECHILD);`
378			`}`
379
380			`/* Return nonzero if the given thread is still alive. */`
381			`static int`
382			`spu_thread_alive (ptid_t ptid)`
383			`{`
384			`return ptid_equal (ptid, current_ptid);`
385			`}`
386
387			`/* Resume process. */`
388			`static void`
389			`spu_resume (struct thread_resume *resume_info, size_t n)`
390			`{`
391			`size_t i;`
392
393			`for (i = 0; i < n; i++)`
394			`if (ptid_equal (resume_info[i].thread, minus_one_ptid)`
395			`\|\| ptid_equal (resume_info[i].thread, current_ptid))`
396			`break;`
397
398			`if (i == n)`
399			`return;`
400
401			`/* We don't support hardware single-stepping right now, assume`
402			`GDB knows to use software single-stepping. */`
403			`if (resume_info[i].kind == resume_step)`
404			`fprintf (stderr, "Hardware single-step not supported.\n");`
405
406			`regcache_invalidate ();`
407
408			`errno = 0;`
409			`ptrace (PTRACE_CONT, ptid_get_lwp (current_ptid), 0, resume_info[i].sig);`
410			`if (errno)`
411			`perror_with_name ("ptrace");`
412			`}`
413
414			`/* Wait for process, returns status. */`
415			`static ptid_t`
416			`spu_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)`
417			`{`
418			`int pid = ptid_get_pid (ptid);`
419			`int w;`
420			`int ret;`
421
422			`while (1)`
423			`{`
424			`ret = waitpid (pid, &w, WNOHANG \| __WALL \| __WNOTHREAD);`
425
426			`if (ret == -1)`
427			`{`
428			`if (errno != ECHILD)`
429			`perror_with_name ("waitpid");`
430			`}`
431			`else if (ret > 0)`
432			`break;`
433
434			`usleep (1000);`
435			`}`
436
437			`/* On the first wait, continue running the inferior until we are`
438			`blocked inside an spu_run system call. */`
439			`if (!server_waiting)`
440			`{`
441			`int fd;`
442			`CORE_ADDR addr;`
443
444			`while (!parse_spufs_run (&fd, &addr))`
445			`{`
446			`ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);`
447			`waitpid (pid, NULL, __WALL \| __WNOTHREAD);`
448			`}`
449			`}`
450
451			`if (WIFEXITED (w))`
452			`{`
453			`fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));`
454			`ourstatus->kind = TARGET_WAITKIND_EXITED;`
455			`ourstatus->value.integer = WEXITSTATUS (w);`
456			`clear_inferiors ();`
457			`return pid_to_ptid (ret);`
458			`}`
459			`else if (!WIFSTOPPED (w))`
460			`{`
461			`fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));`
462			`ourstatus->kind = TARGET_WAITKIND_SIGNALLED;`
463			`ourstatus->value.sig = target_signal_from_host (WTERMSIG (w));`
464			`clear_inferiors ();`
465			`return pid_to_ptid (ret);`
466			`}`
467
468			`/* After attach, we may have received a SIGSTOP. Do not return this`
469			`as signal to GDB, or else it will try to continue with SIGSTOP ... */`
470			`if (!server_waiting)`
471			`{`
472			`ourstatus->kind = TARGET_WAITKIND_STOPPED;`
473			`ourstatus->value.sig = TARGET_SIGNAL_0;`
474			`return ptid_build (ret, ret, 0);`
475			`}`
476
477			`ourstatus->kind = TARGET_WAITKIND_STOPPED;`
478			`ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));`
479			`return ptid_build (ret, ret, 0);`
480			`}`
481
482			`/* Fetch inferior registers. */`
483			`static void`
484			`spu_fetch_registers (struct regcache *regcache, int regno)`
485			`{`
486			`int fd;`
487			`CORE_ADDR addr;`
488
489			`/* We must be stopped on a spu_run system call. */`
490			`if (!parse_spufs_run (&fd, &addr))`
491			`return;`
492
493			`/* The ID register holds the spufs file handle. */`
494			`if (regno == -1 \|\| regno == SPU_ID_REGNUM)`
495			`supply_register (regcache, SPU_ID_REGNUM, (char *)&fd);`
496
497			`/* The NPC register is found at ADDR. */`
498			`if (regno == -1 \|\| regno == SPU_PC_REGNUM)`
499			`{`
500			`char buf[4];`
501			`if (fetch_ppc_memory (addr, buf, 4) == 0)`
502			`supply_register (regcache, SPU_PC_REGNUM, buf);`
503			`}`
504
505			`/* The GPRs are found in the "regs" spufs file. */`
506			`if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_CORE_REGS))`
507			`{`
508			`unsigned char buf[16*SPU_NUM_CORE_REGS];`
509			`char annex[32];`
510			`int i;`
511
512			`sprintf (annex, "%d/regs", fd);`
513			`if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)`
514			`for (i = 0; i < SPU_NUM_CORE_REGS; i++)`
515			`supply_register (regcache, i, buf + i*16);`
516			`}`
517			`}`
518
519			`/* Store inferior registers. */`
520			`static void`
521			`spu_store_registers (struct regcache *regcache, int regno)`
522			`{`
523			`int fd;`
524			`CORE_ADDR addr;`
525
526			`/* ??? Some callers use 0 to mean all registers. */`
527			`if (regno == 0)`
528			`regno = -1;`
529
530			`/* We must be stopped on a spu_run system call. */`
531			`if (!parse_spufs_run (&fd, &addr))`
532			`return;`
533
534			`/* The NPC register is found at ADDR. */`
535			`if (regno == -1 \|\| regno == SPU_PC_REGNUM)`
536			`{`
537			`char buf[4];`
538			`collect_register (regcache, SPU_PC_REGNUM, buf);`
539			`store_ppc_memory (addr, buf, 4);`
540			`}`
541
542			`/* The GPRs are found in the "regs" spufs file. */`
543			`if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_CORE_REGS))`
544			`{`
545			`unsigned char buf[16*SPU_NUM_CORE_REGS];`
546			`char annex[32];`
547			`int i;`
548
549			`for (i = 0; i < SPU_NUM_CORE_REGS; i++)`
550			`collect_register (regcache, i, buf + i*16);`
551
552			`sprintf (annex, "%d/regs", fd);`
553			`spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);`
554			`}`
555			`}`
556
557			`/* Copy LEN bytes from inferior's memory starting at MEMADDR`
558			`to debugger memory starting at MYADDR. */`
559			`static int`
560			`spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)`
561			`{`
562			`int fd, ret;`
563			`CORE_ADDR addr;`
564			`char annex[32], lslr_annex[32], buf[32];`
565			`CORE_ADDR lslr;`
566
567			`/* We must be stopped on a spu_run system call. */`
568			`if (!parse_spufs_run (&fd, &addr))`
569			`return 0;`
570
571			`/* Use the "mem" spufs file to access SPU local store. */`
572			`sprintf (annex, "%d/mem", fd);`
573			`ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len);`
574			`if (ret > 0)`
575			`return ret == len ? 0 : EIO;`
576
577			`/* SPU local store access wraps the address around at the`
578			`local store limit. We emulate this here. To avoid needing`
579			`an extra access to retrieve the LSLR, we only do that after`
580			`trying the original address first, and getting end-of-file. */`
581			`sprintf (lslr_annex, "%d/lslr", fd);`
582			`memset (buf, 0, sizeof buf);`
583			`if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,`
584			`0, sizeof buf) <= 0)`
585			`return ret;`
586
587			`lslr = strtoul (buf, NULL, 16);`
588			`ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr & lslr, len);`
589
590			`return ret == len ? 0 : EIO;`
591			`}`
592
593			`/* Copy LEN bytes of data from debugger memory at MYADDR`
594			`to inferior's memory at MEMADDR.`
595			`On failure (cannot write the inferior)`
596			`returns the value of errno. */`
597			`static int`
598			`spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)`
599			`{`
600			`int fd, ret;`
601			`CORE_ADDR addr;`
602			`char annex[32], lslr_annex[32], buf[32];`
603			`CORE_ADDR lslr;`
604
605			`/* We must be stopped on a spu_run system call. */`
606			`if (!parse_spufs_run (&fd, &addr))`
607			`return 0;`
608
609			`/* Use the "mem" spufs file to access SPU local store. */`
610			`sprintf (annex, "%d/mem", fd);`
611			`ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len);`
612			`if (ret > 0)`
613			`return ret == len ? 0 : EIO;`
614
615			`/* SPU local store access wraps the address around at the`
616			`local store limit. We emulate this here. To avoid needing`
617			`an extra access to retrieve the LSLR, we only do that after`
618			`trying the original address first, and getting end-of-file. */`
619			`sprintf (lslr_annex, "%d/lslr", fd);`
620			`memset (buf, 0, sizeof buf);`
621			`if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,`
622			`0, sizeof buf) <= 0)`
623			`return ret;`
624
625			`lslr = strtoul (buf, NULL, 16);`
626			`ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr & lslr, len);`
627
628			`return ret == len ? 0 : EIO;`
629			`}`
630
631			`/* Look up special symbols -- unneded here. */`
632			`static void`
633			`spu_look_up_symbols (void)`
634			`{`
635			`}`
636
637			`/* Send signal to inferior. */`
638			`static void`
639			`spu_request_interrupt (void)`
640			`{`
641			`syscall (SYS_tkill, ptid_get_lwp (current_ptid), SIGINT);`
642			`}`
643
644			`static struct target_ops spu_target_ops = {`
645			`spu_create_inferior,`
646			`spu_attach,`
647			`spu_kill,`
648			`spu_detach,`
649			`spu_mourn,`
650			`spu_join,`
651			`spu_thread_alive,`
652			`spu_resume,`
653			`spu_wait,`
654			`spu_fetch_registers,`
655			`spu_store_registers,`
656			`spu_read_memory,`
657			`spu_write_memory,`
658			`spu_look_up_symbols,`
659			`spu_request_interrupt,`
660			`NULL,`
661			`NULL,`
662			`NULL,`
663			`NULL,`
664			`NULL,`
665			`NULL,`
666			`NULL,`
667			`spu_proc_xfer_spu,`
668			`hostio_last_error_from_errno,`
669			`};`
670
671			`void`
672			`initialize_low (void)`
673			`{`
674			`static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };`
675
676			`set_target_ops (&spu_target_ops);`
677			`set_breakpoint_data (breakpoint, sizeof breakpoint);`
678			`init_registers_spu ();`
679			`}`