598 lines
14 KiB
C
598 lines
14 KiB
C
/* Low level interface to SPUs, for the remote server for GDB.
|
||
Copyright (C) 2006, 2007 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 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_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,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
spu_arch_string,
|
||
};
|
||
|
||
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 ();
|
||
}
|