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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_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 ();
      remove_process (find_process_pid (ret));
      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 ();
      remove_process (find_process_pid (ret));
      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];
 
  /* 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);
  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];
 
  /* 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);
  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_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-7.1/] [gdb/] [gdbserver/] [spu-low.c] - Blame information for rev 227

Line No.	Rev	Author	Line
1	227	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_join (int pid)`
359			`{`
360			`int status, ret;`
361			`struct process_info *process;`
362
363			`process = find_process_pid (pid);`
364			`if (process == NULL)`
365			`return;`
366
367			`do {`
368			`ret = waitpid (pid, &status, 0);`
369			`if (WIFEXITED (status) \|\| WIFSIGNALED (status))`
370			`break;`
371			`} while (ret != -1 \|\| errno != ECHILD);`
372			`}`
373
374			`/* Return nonzero if the given thread is still alive. */`
375			`static int`
376			`spu_thread_alive (ptid_t ptid)`
377			`{`
378			`return ptid_equal (ptid, current_ptid);`
379			`}`
380
381			`/* Resume process. */`
382			`static void`
383			`spu_resume (struct thread_resume *resume_info, size_t n)`
384			`{`
385			`size_t i;`
386
387			`for (i = 0; i < n; i++)`
388			`if (ptid_equal (resume_info[i].thread, minus_one_ptid)`
389			`\|\| ptid_equal (resume_info[i].thread, current_ptid))`
390			`break;`
391
392			`if (i == n)`
393			`return;`
394
395			`/* We don't support hardware single-stepping right now, assume`
396			`GDB knows to use software single-stepping. */`
397			`if (resume_info[i].kind == resume_step)`
398			`fprintf (stderr, "Hardware single-step not supported.\n");`
399
400			`regcache_invalidate ();`
401
402			`errno = 0;`
403			`ptrace (PTRACE_CONT, ptid_get_lwp (current_ptid), 0, resume_info[i].sig);`
404			`if (errno)`
405			`perror_with_name ("ptrace");`
406			`}`
407
408			`/* Wait for process, returns status. */`
409			`static ptid_t`
410			`spu_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)`
411			`{`
412			`int pid = ptid_get_pid (ptid);`
413			`int w;`
414			`int ret;`
415
416			`while (1)`
417			`{`
418			`ret = waitpid (pid, &w, WNOHANG \| __WALL \| __WNOTHREAD);`
419
420			`if (ret == -1)`
421			`{`
422			`if (errno != ECHILD)`
423			`perror_with_name ("waitpid");`
424			`}`
425			`else if (ret > 0)`
426			`break;`
427
428			`usleep (1000);`
429			`}`
430
431			`/* On the first wait, continue running the inferior until we are`
432			`blocked inside an spu_run system call. */`
433			`if (!server_waiting)`
434			`{`
435			`int fd;`
436			`CORE_ADDR addr;`
437
438			`while (!parse_spufs_run (&fd, &addr))`
439			`{`
440			`ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);`
441			`waitpid (pid, NULL, __WALL \| __WNOTHREAD);`
442			`}`
443			`}`
444
445			`if (WIFEXITED (w))`
446			`{`
447			`fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));`
448			`ourstatus->kind = TARGET_WAITKIND_EXITED;`
449			`ourstatus->value.integer = WEXITSTATUS (w);`
450			`clear_inferiors ();`
451			`remove_process (find_process_pid (ret));`
452			`return pid_to_ptid (ret);`
453			`}`
454			`else if (!WIFSTOPPED (w))`
455			`{`
456			`fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));`
457			`ourstatus->kind = TARGET_WAITKIND_SIGNALLED;`
458			`ourstatus->value.sig = target_signal_from_host (WTERMSIG (w));`
459			`clear_inferiors ();`
460			`remove_process (find_process_pid (ret));`
461			`return pid_to_ptid (ret);`
462			`}`
463
464			`/* After attach, we may have received a SIGSTOP. Do not return this`
465			`as signal to GDB, or else it will try to continue with SIGSTOP ... */`
466			`if (!server_waiting)`
467			`{`
468			`ourstatus->kind = TARGET_WAITKIND_STOPPED;`
469			`ourstatus->value.sig = TARGET_SIGNAL_0;`
470			`return ptid_build (ret, ret, 0);`
471			`}`
472
473			`ourstatus->kind = TARGET_WAITKIND_STOPPED;`
474			`ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));`
475			`return ptid_build (ret, ret, 0);`
476			`}`
477
478			`/* Fetch inferior registers. */`
479			`static void`
480			`spu_fetch_registers (struct regcache *regcache, int regno)`
481			`{`
482			`int fd;`
483			`CORE_ADDR addr;`
484
485			`/* We must be stopped on a spu_run system call. */`
486			`if (!parse_spufs_run (&fd, &addr))`
487			`return;`
488
489			`/* The ID register holds the spufs file handle. */`
490			`if (regno == -1 \|\| regno == SPU_ID_REGNUM)`
491			`supply_register (regcache, SPU_ID_REGNUM, (char *)&fd);`
492
493			`/* The NPC register is found at ADDR. */`
494			`if (regno == -1 \|\| regno == SPU_PC_REGNUM)`
495			`{`
496			`char buf[4];`
497			`if (fetch_ppc_memory (addr, buf, 4) == 0)`
498			`supply_register (regcache, SPU_PC_REGNUM, buf);`
499			`}`
500
501			`/* The GPRs are found in the "regs" spufs file. */`
502			`if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_CORE_REGS))`
503			`{`
504			`unsigned char buf[16*SPU_NUM_CORE_REGS];`
505			`char annex[32];`
506			`int i;`
507
508			`sprintf (annex, "%d/regs", fd);`
509			`if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)`
510			`for (i = 0; i < SPU_NUM_CORE_REGS; i++)`
511			`supply_register (regcache, i, buf + i*16);`
512			`}`
513			`}`
514
515			`/* Store inferior registers. */`
516			`static void`
517			`spu_store_registers (struct regcache *regcache, int regno)`
518			`{`
519			`int fd;`
520			`CORE_ADDR addr;`
521
522			`/* ??? Some callers use 0 to mean all registers. */`
523			`if (regno == 0)`
524			`regno = -1;`
525
526			`/* We must be stopped on a spu_run system call. */`
527			`if (!parse_spufs_run (&fd, &addr))`
528			`return;`
529
530			`/* The NPC register is found at ADDR. */`
531			`if (regno == -1 \|\| regno == SPU_PC_REGNUM)`
532			`{`
533			`char buf[4];`
534			`collect_register (regcache, SPU_PC_REGNUM, buf);`
535			`store_ppc_memory (addr, buf, 4);`
536			`}`
537
538			`/* The GPRs are found in the "regs" spufs file. */`
539			`if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_CORE_REGS))`
540			`{`
541			`unsigned char buf[16*SPU_NUM_CORE_REGS];`
542			`char annex[32];`
543			`int i;`
544
545			`for (i = 0; i < SPU_NUM_CORE_REGS; i++)`
546			`collect_register (regcache, i, buf + i*16);`
547
548			`sprintf (annex, "%d/regs", fd);`
549			`spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);`
550			`}`
551			`}`
552
553			`/* Copy LEN bytes from inferior's memory starting at MEMADDR`
554			`to debugger memory starting at MYADDR. */`
555			`static int`
556			`spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)`
557			`{`
558			`int fd, ret;`
559			`CORE_ADDR addr;`
560			`char annex[32];`
561
562			`/* We must be stopped on a spu_run system call. */`
563			`if (!parse_spufs_run (&fd, &addr))`
564			`return 0;`
565
566			`/* Use the "mem" spufs file to access SPU local store. */`
567			`sprintf (annex, "%d/mem", fd);`
568			`ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len);`
569			`return ret == len ? 0 : EIO;`
570			`}`
571
572			`/* Copy LEN bytes of data from debugger memory at MYADDR`
573			`to inferior's memory at MEMADDR.`
574			`On failure (cannot write the inferior)`
575			`returns the value of errno. */`
576			`static int`
577			`spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)`
578			`{`
579			`int fd, ret;`
580			`CORE_ADDR addr;`
581			`char annex[32];`
582
583			`/* We must be stopped on a spu_run system call. */`
584			`if (!parse_spufs_run (&fd, &addr))`
585			`return 0;`
586
587			`/* Use the "mem" spufs file to access SPU local store. */`
588			`sprintf (annex, "%d/mem", fd);`
589			`ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len);`
590			`return ret == len ? 0 : EIO;`
591			`}`
592
593			`/* Look up special symbols -- unneded here. */`
594			`static void`
595			`spu_look_up_symbols (void)`
596			`{`
597			`}`
598
599			`/* Send signal to inferior. */`
600			`static void`
601			`spu_request_interrupt (void)`
602			`{`
603			`syscall (SYS_tkill, ptid_get_lwp (current_ptid), SIGINT);`
604			`}`
605
606			`static struct target_ops spu_target_ops = {`
607			`spu_create_inferior,`
608			`spu_attach,`
609			`spu_kill,`
610			`spu_detach,`
611			`spu_join,`
612			`spu_thread_alive,`
613			`spu_resume,`
614			`spu_wait,`
615			`spu_fetch_registers,`
616			`spu_store_registers,`
617			`spu_read_memory,`
618			`spu_write_memory,`
619			`spu_look_up_symbols,`
620			`spu_request_interrupt,`
621			`NULL,`
622			`NULL,`
623			`NULL,`
624			`NULL,`
625			`NULL,`
626			`NULL,`
627			`NULL,`
628			`spu_proc_xfer_spu,`
629			`hostio_last_error_from_errno,`
630			`};`
631
632			`void`
633			`initialize_low (void)`
634			`{`
635			`static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };`
636
637			`set_target_ops (&spu_target_ops);`
638			`set_breakpoint_data (breakpoint, sizeof breakpoint);`
639			`init_registers_spu ();`
640			`}`