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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [gdbserver/] [spu-low.c] - Blame information for rev 157

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/* Low level interface to SPUs, for the remote server for GDB.
   Copyright (C) 2006, 2007, 2008 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_tid ((struct inferior_list_entry *)current_inferior)->id
 
/* These are used in remote-utils.c.  */
int using_threads = 0;
 
 
/* Fetch PPU register REGNO.  */
static CORE_ADDR
fetch_ppc_register (int regno)
{
  PTRACE_TYPE_RET res;
 
  int tid = current_tid;
 
#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 = current_tid;
 
  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 = current_tid;
 
  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", current_tid, 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;
 
  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_thread (pid, NULL, pid);
  return pid;
}
 
/* Attach to an inferior process.  */
int
spu_attach (unsigned long  pid)
{
  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_thread (pid, NULL, pid);
  return 0;
}
 
/* Kill the inferior process.  */
static void
spu_kill (void)
{
  ptrace (PTRACE_KILL, current_tid, 0, 0);
}
 
/* Detach from inferior process.  */
static int
spu_detach (void)
{
  ptrace (PTRACE_DETACH, current_tid, 0, 0);
  return 0;
}
 
static void
spu_join (void)
{
  int status, ret;
 
  do {
    ret = waitpid (current_tid, &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 (unsigned long tid)
{
  return tid == current_tid;
}
 
/* Resume process.  */
static void
spu_resume (struct thread_resume *resume_info)
{
  while (resume_info->thread != -1
         && resume_info->thread != current_tid)
    resume_info++;
 
  if (resume_info->leave_stopped)
    return;
 
  /* We don't support hardware single-stepping right now, assume
     GDB knows to use software single-stepping.  */
  if (resume_info->step)
    fprintf (stderr, "Hardware single-step not supported.\n");
 
  regcache_invalidate ();
 
  errno = 0;
  ptrace (PTRACE_CONT, current_tid, 0, resume_info->sig);
  if (errno)
    perror_with_name ("ptrace");
}
 
/* Wait for process, returns status.  */
static unsigned char
spu_wait (char *status)
{
  int tid = current_tid;
  int w;
  int ret;
 
  while (1)
    {
      ret = waitpid (tid, &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, tid, (PTRACE_TYPE_ARG3) 0, 0);
          waitpid (tid, NULL, __WALL | __WNOTHREAD);
        }
    }
 
  if (WIFEXITED (w))
    {
      fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
      *status = 'W';
      clear_inferiors ();
      return ((unsigned char) WEXITSTATUS (w));
    }
  else if (!WIFSTOPPED (w))
    {
      fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
      *status = 'X';
      clear_inferiors ();
      return ((unsigned char) WTERMSIG (w));
    }
 
  /* 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)
    {
      *status = 'T';
      return 0;
    }
 
  *status = 'T';
  return ((unsigned char) WSTOPSIG (w));
}
 
/* Fetch inferior registers.  */
static void
spu_fetch_registers (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 ID register holds the spufs file handle.  */
  if (regno == -1 || regno == SPU_ID_REGNUM)
    supply_register (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 (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 (i, buf + i*16);
    }
}
 
/* Store inferior registers.  */
static void
spu_store_registers (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 (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 (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, current_tid, SIGINT);
}
 
static const char *
spu_arch_string (void)
{
  return "spu";
}
 
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_arch_string,
  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 ();
}

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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [gdbserver/] [spu-low.c] - Blame information for rev 157

Line No.	Rev	Author	Line
1	24	jeremybenn	`/* Low level interface to SPUs, for the remote server for GDB.`
2			`Copyright (C) 2006, 2007, 2008 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_tid ((struct inferior_list_entry *)current_inferior)->id`
56
57			`/* These are used in remote-utils.c. */`
58			`int using_threads = 0;`
59
60
61			`/* Fetch PPU register REGNO. */`
62			`static CORE_ADDR`
63			`fetch_ppc_register (int regno)`
64			`{`
65			`PTRACE_TYPE_RET res;`
66
67			`int tid = current_tid;`
68
69			`#ifndef __powerpc64__`
70			`/* If running as a 32-bit process on a 64-bit system, we attempt`
71			`to get the full 64-bit register content of the target process.`
72			`If the PPC special ptrace call fails, we're on a 32-bit system;`
73			`just fall through to the regular ptrace call in that case. */`
74			`{`
75			`char buf[8];`
76
77			`errno = 0;`
78			`ptrace (PPC_PTRACE_PEEKUSR_3264, tid,`
79			`(PTRACE_TYPE_ARG3) (regno * 8), buf);`
80			`if (errno == 0)`
81			`ptrace (PPC_PTRACE_PEEKUSR_3264, tid,`
82			`(PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);`
83			`if (errno == 0)`
84			`return (CORE_ADDR) (unsigned long long )buf;`
85			`}`
86			`#endif`
87
88			`errno = 0;`
89			`res = ptrace (PT_READ_U, tid,`
90			`(PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);`
91			`if (errno != 0)`
92			`{`
93			`char mess[128];`
94			`sprintf (mess, "reading PPC register #%d", regno);`
95			`perror_with_name (mess);`
96			`}`
97
98			`return (CORE_ADDR) (unsigned long) res;`
99			`}`
100
101			`/* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */`
102			`static int`
103			`fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)`
104			`{`
105			`errno = 0;`
106
107			`#ifndef __powerpc64__`
108			`if (memaddr >> 32)`
109			`{`
110			`unsigned long long addr_8 = (unsigned long long) memaddr;`
111			`ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);`
112			`}`
113			`else`
114			`#endif`
115			`*word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);`
116
117			`return errno;`
118			`}`
119
120			`/* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */`
121			`static int`
122			`store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)`
123			`{`
124			`errno = 0;`
125
126			`#ifndef __powerpc64__`
127			`if (memaddr >> 32)`
128			`{`
129			`unsigned long long addr_8 = (unsigned long long) memaddr;`
130			`ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word);`
131			`}`
132			`else`
133			`#endif`
134			`ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);`
135
136			`return errno;`
137			`}`
138
139			`/* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */`
140			`static int`
141			`fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)`
142			`{`
143			`int i, ret;`
144
145			`CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);`
146			`int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)`
147			`/ sizeof (PTRACE_TYPE_RET));`
148			`PTRACE_TYPE_RET *buffer;`
149
150			`int tid = current_tid;`
151
152			`buffer = (PTRACE_TYPE_RET ) alloca (count sizeof (PTRACE_TYPE_RET));`
153			`for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))`
154			`if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0)`
155			`return ret;`
156
157			`memcpy (myaddr,`
158			`(char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),`
159			`len);`
160
161			`return 0;`
162			`}`
163
164			`/* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */`
165			`static int`
166			`store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)`
167			`{`
168			`int i, ret;`
169
170			`CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);`
171			`int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)`
172			`/ sizeof (PTRACE_TYPE_RET));`
173			`PTRACE_TYPE_RET *buffer;`
174
175			`int tid = current_tid;`
176
177			`buffer = (PTRACE_TYPE_RET ) alloca (count sizeof (PTRACE_TYPE_RET));`
178
179			`if (addr != memaddr \|\| len < (int) sizeof (PTRACE_TYPE_RET))`
180			`if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)`
181			`return ret;`
182
183			`if (count > 1)`
184			`if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)`
185			`* sizeof (PTRACE_TYPE_RET),`
186			`&buffer[count - 1])) != 0)`
187			`return ret;`
188
189			`memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),`
190			`myaddr, len);`
191
192			`for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))`
193			`if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)`
194			`return ret;`
195
196			`return 0;`
197			`}`
198
199
200			`/* If the PPU thread is currently stopped on a spu_run system call,`
201			`return to FD and ADDR the file handle and NPC parameter address`
202			`used with the system call. Return non-zero if successful. */`
203			`static int`
204			`parse_spufs_run (int fd, CORE_ADDR addr)`
205			`{`
206			`char buf[4];`
207			`CORE_ADDR pc = fetch_ppc_register (32); /* nip */`
208
209			`/* Fetch instruction preceding current NIP. */`
210			`if (fetch_ppc_memory (pc-4, buf, 4) != 0)`
211			`return 0;`
212			`/* It should be a "sc" instruction. */`
213			`if ((unsigned int )buf != INSTR_SC)`
214			`return 0;`
215			`/* System call number should be NR_spu_run. */`
216			`if (fetch_ppc_register (0) != NR_spu_run)`
217			`return 0;`
218
219			`/* Register 3 contains fd, register 4 the NPC param pointer. */`
220			`fd = fetch_ppc_register (34); / orig_gpr3 */`
221			`*addr = fetch_ppc_register (4);`
222			`return 1;`
223			`}`
224
225
226			`/* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,`
227			`using the /proc file system. */`
228			`static int`
229			`spu_proc_xfer_spu (const char annex, unsigned char readbuf,`
230			`const unsigned char *writebuf,`
231			`CORE_ADDR offset, int len)`
232			`{`
233			`char buf[128];`
234			`int fd = 0;`
235			`int ret = -1;`
236
237			`if (!annex)`
238			`return 0;`
239
240			`sprintf (buf, "/proc/%ld/fd/%s", current_tid, annex);`
241			`fd = open (buf, writebuf? O_WRONLY : O_RDONLY);`
242			`if (fd <= 0)`
243			`return -1;`
244
245			`if (offset != 0`
246			`&& lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)`
247			`{`
248			`close (fd);`
249			`return 0;`
250			`}`
251
252			`if (writebuf)`
253			`ret = write (fd, writebuf, (size_t) len);`
254			`else if (readbuf)`
255			`ret = read (fd, readbuf, (size_t) len);`
256
257			`close (fd);`
258			`return ret;`
259			`}`
260
261
262			`/* Start an inferior process and returns its pid.`
263			`ALLARGS is a vector of program-name and args. */`
264			`static int`
265			`spu_create_inferior (char program, char *allargs)`
266			`{`
267			`int pid;`
268
269			`pid = fork ();`
270			`if (pid < 0)`
271			`perror_with_name ("fork");`
272
273			`if (pid == 0)`
274			`{`
275			`ptrace (PTRACE_TRACEME, 0, 0, 0);`
276
277			`setpgid (0, 0);`
278
279			`execv (program, allargs);`
280			`if (errno == ENOENT)`
281			`execvp (program, allargs);`
282
283			`fprintf (stderr, "Cannot exec %s: %s.\n", program,`
284			`strerror (errno));`
285			`fflush (stderr);`
286			`_exit (0177);`
287			`}`
288
289			`add_thread (pid, NULL, pid);`
290			`return pid;`
291			`}`
292
293			`/* Attach to an inferior process. */`
294			`int`
295			`spu_attach (unsigned long pid)`
296			`{`
297			`if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)`
298			`{`
299			`fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,`
300			`strerror (errno), errno);`
301			`fflush (stderr);`
302			`_exit (0177);`
303			`}`
304
305			`add_thread (pid, NULL, pid);`
306			`return 0;`
307			`}`
308
309			`/* Kill the inferior process. */`
310			`static void`
311			`spu_kill (void)`
312			`{`
313			`ptrace (PTRACE_KILL, current_tid, 0, 0);`
314			`}`
315
316			`/* Detach from inferior process. */`
317			`static int`
318			`spu_detach (void)`
319			`{`
320			`ptrace (PTRACE_DETACH, current_tid, 0, 0);`
321			`return 0;`
322			`}`
323
324			`static void`
325			`spu_join (void)`
326			`{`
327			`int status, ret;`
328
329			`do {`
330			`ret = waitpid (current_tid, &status, 0);`
331			`if (WIFEXITED (status) \|\| WIFSIGNALED (status))`
332			`break;`
333			`} while (ret != -1 \|\| errno != ECHILD);`
334			`}`
335
336			`/* Return nonzero if the given thread is still alive. */`
337			`static int`
338			`spu_thread_alive (unsigned long tid)`
339			`{`
340			`return tid == current_tid;`
341			`}`
342
343			`/* Resume process. */`
344			`static void`
345			`spu_resume (struct thread_resume *resume_info)`
346			`{`
347			`while (resume_info->thread != -1`
348			`&& resume_info->thread != current_tid)`
349			`resume_info++;`
350
351			`if (resume_info->leave_stopped)`
352			`return;`
353
354			`/* We don't support hardware single-stepping right now, assume`
355			`GDB knows to use software single-stepping. */`
356			`if (resume_info->step)`
357			`fprintf (stderr, "Hardware single-step not supported.\n");`
358
359			`regcache_invalidate ();`
360
361			`errno = 0;`
362			`ptrace (PTRACE_CONT, current_tid, 0, resume_info->sig);`
363			`if (errno)`
364			`perror_with_name ("ptrace");`
365			`}`
366
367			`/* Wait for process, returns status. */`
368			`static unsigned char`
369			`spu_wait (char *status)`
370			`{`
371			`int tid = current_tid;`
372			`int w;`
373			`int ret;`
374
375			`while (1)`
376			`{`
377			`ret = waitpid (tid, &w, WNOHANG \| __WALL \| __WNOTHREAD);`
378
379			`if (ret == -1)`
380			`{`
381			`if (errno != ECHILD)`
382			`perror_with_name ("waitpid");`
383			`}`
384			`else if (ret > 0)`
385			`break;`
386
387			`usleep (1000);`
388			`}`
389
390			`/* On the first wait, continue running the inferior until we are`
391			`blocked inside an spu_run system call. */`
392			`if (!server_waiting)`
393			`{`
394			`int fd;`
395			`CORE_ADDR addr;`
396
397			`while (!parse_spufs_run (&fd, &addr))`
398			`{`
399			`ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0);`
400			`waitpid (tid, NULL, __WALL \| __WNOTHREAD);`
401			`}`
402			`}`
403
404			`if (WIFEXITED (w))`
405			`{`
406			`fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));`
407			`*status = 'W';`
408			`clear_inferiors ();`
409			`return ((unsigned char) WEXITSTATUS (w));`
410			`}`
411			`else if (!WIFSTOPPED (w))`
412			`{`
413			`fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));`
414			`*status = 'X';`
415			`clear_inferiors ();`
416			`return ((unsigned char) WTERMSIG (w));`
417			`}`
418
419			`/* After attach, we may have received a SIGSTOP. Do not return this`
420			`as signal to GDB, or else it will try to continue with SIGSTOP ... */`
421			`if (!server_waiting)`
422			`{`
423			`*status = 'T';`
424			`return 0;`
425			`}`
426
427			`*status = 'T';`
428			`return ((unsigned char) WSTOPSIG (w));`
429			`}`
430
431			`/* Fetch inferior registers. */`
432			`static void`
433			`spu_fetch_registers (int regno)`
434			`{`
435			`int fd;`
436			`CORE_ADDR addr;`
437
438			`/* ??? Some callers use 0 to mean all registers. */`
439			`if (regno == 0)`
440			`regno = -1;`
441
442			`/* We must be stopped on a spu_run system call. */`
443			`if (!parse_spufs_run (&fd, &addr))`
444			`return;`
445
446			`/* The ID register holds the spufs file handle. */`
447			`if (regno == -1 \|\| regno == SPU_ID_REGNUM)`
448			`supply_register (SPU_ID_REGNUM, (char *)&fd);`
449
450			`/* The NPC register is found at ADDR. */`
451			`if (regno == -1 \|\| regno == SPU_PC_REGNUM)`
452			`{`
453			`char buf[4];`
454			`if (fetch_ppc_memory (addr, buf, 4) == 0)`
455			`supply_register (SPU_PC_REGNUM, buf);`
456			`}`
457
458			`/* The GPRs are found in the "regs" spufs file. */`
459			`if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_CORE_REGS))`
460			`{`
461			`unsigned char buf[16*SPU_NUM_CORE_REGS];`
462			`char annex[32];`
463			`int i;`
464
465			`sprintf (annex, "%d/regs", fd);`
466			`if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)`
467			`for (i = 0; i < SPU_NUM_CORE_REGS; i++)`
468			`supply_register (i, buf + i*16);`
469			`}`
470			`}`
471
472			`/* Store inferior registers. */`
473			`static void`
474			`spu_store_registers (int regno)`
475			`{`
476			`int fd;`
477			`CORE_ADDR addr;`
478
479			`/* ??? Some callers use 0 to mean all registers. */`
480			`if (regno == 0)`
481			`regno = -1;`
482
483			`/* We must be stopped on a spu_run system call. */`
484			`if (!parse_spufs_run (&fd, &addr))`
485			`return;`
486
487			`/* The NPC register is found at ADDR. */`
488			`if (regno == -1 \|\| regno == SPU_PC_REGNUM)`
489			`{`
490			`char buf[4];`
491			`collect_register (SPU_PC_REGNUM, buf);`
492			`store_ppc_memory (addr, buf, 4);`
493			`}`
494
495			`/* The GPRs are found in the "regs" spufs file. */`
496			`if (regno == -1 \|\| (regno >= 0 && regno < SPU_NUM_CORE_REGS))`
497			`{`
498			`unsigned char buf[16*SPU_NUM_CORE_REGS];`
499			`char annex[32];`
500			`int i;`
501
502			`for (i = 0; i < SPU_NUM_CORE_REGS; i++)`
503			`collect_register (i, buf + i*16);`
504
505			`sprintf (annex, "%d/regs", fd);`
506			`spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);`
507			`}`
508			`}`
509
510			`/* Copy LEN bytes from inferior's memory starting at MEMADDR`
511			`to debugger memory starting at MYADDR. */`
512			`static int`
513			`spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)`
514			`{`
515			`int fd, ret;`
516			`CORE_ADDR addr;`
517			`char annex[32];`
518
519			`/* We must be stopped on a spu_run system call. */`
520			`if (!parse_spufs_run (&fd, &addr))`
521			`return 0;`
522
523			`/* Use the "mem" spufs file to access SPU local store. */`
524			`sprintf (annex, "%d/mem", fd);`
525			`ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len);`
526			`return ret == len ? 0 : EIO;`
527			`}`
528
529			`/* Copy LEN bytes of data from debugger memory at MYADDR`
530			`to inferior's memory at MEMADDR.`
531			`On failure (cannot write the inferior)`
532			`returns the value of errno. */`
533			`static int`
534			`spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)`
535			`{`
536			`int fd, ret;`
537			`CORE_ADDR addr;`
538			`char annex[32];`
539
540			`/* We must be stopped on a spu_run system call. */`
541			`if (!parse_spufs_run (&fd, &addr))`
542			`return 0;`
543
544			`/* Use the "mem" spufs file to access SPU local store. */`
545			`sprintf (annex, "%d/mem", fd);`
546			`ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len);`
547			`return ret == len ? 0 : EIO;`
548			`}`
549
550			`/* Look up special symbols -- unneded here. */`
551			`static void`
552			`spu_look_up_symbols (void)`
553			`{`
554			`}`
555
556			`/* Send signal to inferior. */`
557			`static void`
558			`spu_request_interrupt (void)`
559			`{`
560			`syscall (SYS_tkill, current_tid, SIGINT);`
561			`}`
562
563			`static const char *`
564			`spu_arch_string (void)`
565			`{`
566			`return "spu";`
567			`}`
568
569			`static struct target_ops spu_target_ops = {`
570			`spu_create_inferior,`
571			`spu_attach,`
572			`spu_kill,`
573			`spu_detach,`
574			`spu_join,`
575			`spu_thread_alive,`
576			`spu_resume,`
577			`spu_wait,`
578			`spu_fetch_registers,`
579			`spu_store_registers,`
580			`spu_read_memory,`
581			`spu_write_memory,`
582			`spu_look_up_symbols,`
583			`spu_request_interrupt,`
584			`NULL,`
585			`NULL,`
586			`NULL,`
587			`NULL,`
588			`NULL,`
589			`NULL,`
590			`NULL,`
591			`spu_arch_string,`
592			`spu_proc_xfer_spu,`
593			`hostio_last_error_from_errno,`
594			`};`
595
596			`void`
597			`initialize_low (void)`
598			`{`
599			`static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };`
600
601			`set_target_ops (&spu_target_ops);`
602			`set_breakpoint_data (breakpoint, sizeof breakpoint);`
603			`init_registers ();`
604			`}`