* config/powerpc/spu-linux.mh: New file.

	* config/spu/spu.mt: New file.
	* configure.ac: Provide gdb_native configuration variable.
	* configure: Regenerate.
	* configure.host: Support powerpc64 to spu 'pseudo-native' mode.
	* configure.tgt: Add "spu" target_cpu and "spu*-*-*" target.
	* Makefile.in (spu_tdep_h): New variable.
	(ALLDEPFILES): Add spu-linux-nat.c and spu-tdep.c
	(spu-linux-nat.o, spu-tdep.o): Add dependencies.
	* spu-linux-nat.c: New file.
	* spu-tdep.c: New file.
	* spu-tdep.h: New file.

1 files changed, 557 insertions, 0 deletions

diff --git a/gdb/spu-linux-nat.c b/gdb/spu-linux-nat.c
new file mode 100644
index 0000000..fd3673c
--- /dev/null
+++ b/gdb/spu-linux-nat.c
@@ -0,0 +1,557 @@
+/* SPU native-dependent code for GDB, the GNU debugger.
+   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 "defs.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include "target.h"
+#include "inferior.h"
+#include "inf-ptrace.h"
+#include "regcache.h"
+#include "symfile.h"
+#include "gdb_wait.h"
+
+#include <sys/ptrace.h>
+#include <asm/ptrace.h>
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include "spu-tdep.h"
+
+/* PPU side system calls.  */
+#define INSTR_SC	0x44000002
+#define NR_spu_run	0x0116
+
+
+/* Fetch PPU register REGNO.  */
+static CORE_ADDR
+fetch_ppc_register (int regno)
+{
+  PTRACE_TYPE_RET res;
+
+  int tid = TIDGET (inferior_ptid);
+  if (tid == 0)
+    tid = PIDGET (inferior_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.  */
+  {
+    gdb_byte 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];
+      xsnprintf (mess, sizeof 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, gdb_byte *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 = TIDGET (inferior_ptid);
+  if (tid == 0)
+    tid = PIDGET (inferior_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, const gdb_byte *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 = TIDGET (inferior_ptid);
+  if (tid == 0)
+    tid = PIDGET (inferior_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)
+{
+  gdb_byte 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 (extract_unsigned_integer (buf, 4) != 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 LONGEST
+spu_proc_xfer_spu (const char *annex, gdb_byte *readbuf,
+		   const gdb_byte *writebuf,
+		   ULONGEST offset, LONGEST len)
+{
+  char buf[128];
+  int fd = 0;
+  int ret = -1;
+  int pid = PIDGET (inferior_ptid);
+
+  if (!annex)
+    return 0;
+
+  xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, 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;
+}
+
+
+/* Inferior memory should contain an SPE executable image at location ADDR.
+   Allocate a BFD representing that executable.  Return NULL on error.  */
+
+static void *
+spu_bfd_iovec_open (struct bfd *nbfd, void *open_closure)
+{
+  return open_closure;
+}
+
+static int
+spu_bfd_iovec_close (struct bfd *nbfd, void *stream)
+{
+  xfree (stream);
+  return 1;
+}
+
+static file_ptr
+spu_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf,
+	             file_ptr nbytes, file_ptr offset)
+{
+  CORE_ADDR addr = *(CORE_ADDR *)stream;
+
+  if (fetch_ppc_memory (addr + offset, buf, nbytes) != 0)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return -1;
+    }
+
+  return nbytes;
+}
+
+static bfd *
+spu_bfd_open (CORE_ADDR addr)
+{
+  struct bfd *nbfd;
+
+  CORE_ADDR *open_closure = xmalloc (sizeof (CORE_ADDR));
+  *open_closure = addr;
+
+  nbfd = bfd_openr_iovec (xstrdup ("<in-memory>"), "elf32-spu",
+			  spu_bfd_iovec_open, open_closure,
+			  spu_bfd_iovec_pread, spu_bfd_iovec_close);
+  if (!nbfd)
+    return NULL;
+
+  if (!bfd_check_format (nbfd, bfd_object))
+    {
+      bfd_close (nbfd);
+      return NULL;
+    }
+
+  return nbfd;
+}
+
+/* INFERIOR_FD is a file handle passed by the inferior to the
+   spu_run system call.  Assuming the SPE context was allocated
+   by the libspe library, try to retrieve the main SPE executable
+   file from its copy within the target process.  */
+static void
+spu_symbol_file_add_from_memory (int inferior_fd)
+{
+  CORE_ADDR addr;
+  struct bfd *nbfd;
+
+  char id[128];
+  char annex[32];
+  int len;
+
+  /* Read object ID.  */
+  xsnprintf (annex, sizeof annex, "%d/object-id", inferior_fd);
+  len = spu_proc_xfer_spu (annex, id, NULL, 0, sizeof id);
+  if (len <= 0 || len >= sizeof id)
+    return;
+  id[len] = 0;
+  if (sscanf (id, "0x%llx", &addr) != 1)
+    return;
+
+  /* Open BFD representing SPE executable and read its symbols.  */
+  nbfd = spu_bfd_open (addr);
+  if (nbfd)
+    symbol_file_add_from_bfd (nbfd, 0, NULL, 1, 0);
+}
+
+
+/* Override the post_startup_inferior routine to continue running
+   the inferior until the first spu_run system call.  */
+static void
+spu_child_post_startup_inferior (ptid_t ptid)
+{
+  int fd;
+  CORE_ADDR addr;
+
+  int tid = TIDGET (ptid);
+  if (tid == 0)
+    tid = PIDGET (ptid);
+  
+  while (!parse_spufs_run (&fd, &addr))
+    {
+      ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0);
+      waitpid (tid, NULL, __WALL | __WNOTHREAD);
+    }
+}
+
+/* Override the post_attach routine to try load the SPE executable
+   file image from its copy inside the target process.  */
+static void
+spu_child_post_attach (int pid)
+{
+  int fd;
+  CORE_ADDR addr;
+
+  /* Like child_post_startup_inferior, if we happened to attach to
+     the inferior while it wasn't currently in spu_run, continue 
+     running it until we get back there.  */
+  while (!parse_spufs_run (&fd, &addr))
+    {
+      ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);
+      waitpid (pid, NULL, __WALL | __WNOTHREAD);
+    }
+
+  /* If the user has not provided an executable file, try to extract
+     the image from inside the target process.  */
+  if (!get_exec_file (0))
+    spu_symbol_file_add_from_memory (fd);
+}
+
+/* Wait for child PTID to do something.  Return id of the child,
+   minus_one_ptid in case of error; store status into *OURSTATUS.  */
+static ptid_t
+spu_child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
+{
+  int save_errno;
+  int status;
+  pid_t pid;
+
+  do
+    {
+      set_sigint_trap ();	/* Causes SIGINT to be passed on to the
+				   attached process.  */
+      set_sigio_trap ();
+
+      pid = waitpid (PIDGET (ptid), &status, 0);
+      if (pid == -1 && errno == ECHILD)
+	/* Try again with __WCLONE to check cloned processes.  */
+	pid = waitpid (PIDGET (ptid), &status, __WCLONE);
+
+      save_errno = errno;
+
+      /* Make sure we don't report an event for the exit of the
+         original program, if we've detached from it.  */
+      if (pid != -1 && !WIFSTOPPED (status) && pid != PIDGET (inferior_ptid))
+	{
+	  pid = -1;
+	  save_errno = EINTR;
+	}
+
+      clear_sigio_trap ();
+      clear_sigint_trap ();
+    }
+  while (pid == -1 && save_errno == EINTR);
+
+  if (pid == -1)
+    {
+      warning ("Child process unexpectedly missing: %s",
+	       safe_strerror (save_errno));
+
+      /* Claim it exited with unknown signal.  */
+      ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+      ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+      return minus_one_ptid;
+    }
+
+  store_waitstatus (ourstatus, status);
+  return pid_to_ptid (pid);
+}
+
+/* Override the fetch_inferior_register routine.  */
+static void
+spu_fetch_inferior_registers (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)
+    {
+      char buf[4];
+      store_unsigned_integer (buf, 4, fd);
+      regcache_raw_supply (current_regcache, SPU_ID_REGNUM, buf);
+    }
+
+  /* The NPC register is found at ADDR.  */
+  if (regno == -1 || regno == SPU_PC_REGNUM)
+    {
+      gdb_byte buf[4];
+      if (fetch_ppc_memory (addr, buf, 4) == 0)
+	regcache_raw_supply (current_regcache, SPU_PC_REGNUM, buf);
+    }
+
+  /* The GPRs are found in the "regs" spufs file.  */
+  if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
+    {
+      gdb_byte buf[16 * SPU_NUM_GPRS];
+      char annex[32];
+      int i;
+
+      xsnprintf (annex, sizeof annex, "%d/regs", fd);
+      if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)
+	for (i = 0; i < SPU_NUM_GPRS; i++)
+	  regcache_raw_supply (current_regcache, i, buf + i*16);
+    }
+}
+
+/* Override the store_inferior_register routine.  */
+static void
+spu_store_inferior_registers (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 NPC register is found at ADDR.  */
+  if (regno == -1 || regno == SPU_PC_REGNUM)
+    {
+      gdb_byte buf[4];
+      regcache_raw_collect (current_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_GPRS))
+    {
+      gdb_byte buf[16 * SPU_NUM_GPRS];
+      char annex[32];
+      int i;
+
+      for (i = 0; i < SPU_NUM_GPRS; i++)
+	regcache_raw_collect (current_regcache, i, buf + i*16);
+
+      xsnprintf (annex, sizeof annex, "%d/regs", fd);
+      spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf);
+    }
+}
+
+/* Override the to_xfer_partial routine.  */
+static LONGEST 
+spu_xfer_partial (struct target_ops *ops,
+		  enum target_object object, const char *annex,
+		  gdb_byte *readbuf, const gdb_byte *writebuf,
+		  ULONGEST offset, LONGEST len)
+{
+  if (object == TARGET_OBJECT_MEMORY)
+    {
+      int fd;
+      CORE_ADDR addr;
+      char mem_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.  */
+      xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
+      return spu_proc_xfer_spu (mem_annex, readbuf, writebuf, offset, len);
+    }
+
+  return 0;
+}
+
+/* Override the to_can_use_hw_breakpoint routine.  */
+static int
+spu_can_use_hw_breakpoint (int type, int cnt, int othertype)
+{
+  return 0;
+}
+
+
+/* Initialize SPU native target.  */
+void 
+_initialize_spu_nat (void)
+{
+  /* Generic ptrace methods.  */
+  struct target_ops *t;
+  t = inf_ptrace_target ();
+
+  /* Add SPU methods.  */
+  t->to_post_attach = spu_child_post_attach;  
+  t->to_post_startup_inferior = spu_child_post_startup_inferior;
+  t->to_wait = spu_child_wait;
+  t->to_fetch_registers = spu_fetch_inferior_registers;
+  t->to_store_registers = spu_store_inferior_registers;
+  t->to_xfer_partial = spu_xfer_partial;
+  t->to_can_use_hw_breakpoint = spu_can_use_hw_breakpoint;
+
+  /* Register SPU target.  */
+  add_target (t);
+}
+