--- /dev/null
+/* 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);
+}
+
+\f
+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 ();
+}
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