ChangeLog:

	* configure.tgt: Enable gdbserver for SPU target.
	* configure.ac: Build gdbserver when gdb_native is yes.
	* configure: Regenerate.
	* regformats/reg-spu.dat: New file.

gdbserver/ChangeLog:

	* configure.srv: Add target "spu*-*-*".
	* Makefile.in (clean): Remove reg-spu.c.
	(reg-spu.c, reg-spu.o, spu-low.o): Add dependencies.
	* spu-low.c: New file.

1 files changed, 585 insertions, 0 deletions

diff --git a/gdb/gdbserver/spu-low.c b/gdb/gdbserver/spu-low.c
new file mode 100644
index 0000000..024a052
--- /dev/null
+++ b/gdb/gdbserver/spu-low.c
@@ -0,0 +1,585 @@
+/* Low level interface to SPUs, for the remote server for GDB.
+   Copyright (C) 2006 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 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#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;
+int debug_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 -1;
+    }
+
+  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);
+
+      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 void
+spu_detach (void)
+{
+  ptrace (PTRACE_DETACH, current_tid, 0, 0);
+}
+
+/* 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++;
+
+  block_async_io ();
+  enable_async_io ();
+
+  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;
+
+  enable_async_io ();
+  unblock_async_io ();
+
+  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);
+	}
+    }
+
+  disable_async_io ();
+
+  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_send_signal (int signo)
+{
+  syscall (SYS_tkill, current_tid, signo);
+}
+
+
+static struct target_ops spu_target_ops = {
+  spu_create_inferior,
+  spu_attach,
+  spu_kill,
+  spu_detach,
+  spu_thread_alive,
+  spu_resume,
+  spu_wait,
+  spu_fetch_registers,
+  spu_store_registers,
+  spu_read_memory,
+  spu_write_memory,
+  spu_look_up_symbols,
+  spu_send_signal,
+  NULL,
+};
+
+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 ();
+}