739 lines
19 KiB
C
739 lines
19 KiB
C
/* Low level interface to SPUs, for the remote server for GDB.
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Copyright (C) 2006-2018 Free Software Foundation, Inc.
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Contributed by Ulrich Weigand <uweigand@de.ibm.com>.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "gdb_wait.h"
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#include <sys/ptrace.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include "filestuff.h"
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#include "hostio.h"
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#include "nat/fork-inferior.h"
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/* Some older glibc versions do not define this. */
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#ifndef __WNOTHREAD
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#define __WNOTHREAD 0x20000000 /* Don't wait on children of other
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threads in this group */
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#endif
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#define PTRACE_TYPE_RET long
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#define PTRACE_TYPE_ARG3 long
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/* Number of registers. */
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#define SPU_NUM_REGS 130
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#define SPU_NUM_CORE_REGS 128
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/* Special registers. */
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#define SPU_ID_REGNUM 128
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#define SPU_PC_REGNUM 129
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/* PPU side system calls. */
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#define INSTR_SC 0x44000002
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#define NR_spu_run 0x0116
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/* These are used in remote-utils.c. */
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int using_threads = 0;
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/* Defined in auto-generated file reg-spu.c. */
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void init_registers_spu (void);
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extern const struct target_desc *tdesc_spu;
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/* Software breakpoint instruction. */
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static const gdb_byte breakpoint[] = { 0x00, 0x00, 0x3f, 0xff };
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/* Fetch PPU register REGNO. */
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static CORE_ADDR
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fetch_ppc_register (int regno)
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{
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PTRACE_TYPE_RET res;
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int tid = ptid_get_lwp (current_ptid);
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#ifndef __powerpc64__
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/* If running as a 32-bit process on a 64-bit system, we attempt
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to get the full 64-bit register content of the target process.
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If the PPC special ptrace call fails, we're on a 32-bit system;
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just fall through to the regular ptrace call in that case. */
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{
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char buf[8];
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errno = 0;
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ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_PEEKUSR_3264, tid,
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(PTRACE_TYPE_ARG3) (regno * 8), buf);
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if (errno == 0)
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ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_PEEKUSR_3264, tid,
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(PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4);
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if (errno == 0)
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return (CORE_ADDR) *(unsigned long long *)buf;
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}
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#endif
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errno = 0;
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res = ptrace (PT_READ_U, tid,
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(PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0);
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if (errno != 0)
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{
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char mess[128];
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sprintf (mess, "reading PPC register #%d", regno);
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perror_with_name (mess);
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}
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return (CORE_ADDR) (unsigned long) res;
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}
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/* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */
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static int
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fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word)
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{
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errno = 0;
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#ifndef __powerpc64__
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if (memaddr >> 32)
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{
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unsigned long long addr_8 = (unsigned long long) memaddr;
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ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_PEEKTEXT_3264, tid,
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(PTRACE_TYPE_ARG3) &addr_8, word);
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}
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else
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#endif
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*word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0);
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return errno;
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}
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/* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */
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static int
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store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word)
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{
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errno = 0;
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#ifndef __powerpc64__
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if (memaddr >> 32)
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{
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unsigned long long addr_8 = (unsigned long long) memaddr;
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ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_POKEDATA_3264, tid,
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(PTRACE_TYPE_ARG3) &addr_8, word);
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}
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else
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#endif
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ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word);
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return errno;
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}
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/* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */
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static int
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fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
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{
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int i, ret;
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CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
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int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
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/ sizeof (PTRACE_TYPE_RET));
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PTRACE_TYPE_RET *buffer;
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int tid = ptid_get_lwp (current_ptid);
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buffer = XALLOCAVEC (PTRACE_TYPE_RET, count);
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for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
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if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0)
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return ret;
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memcpy (myaddr,
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(char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
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len);
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return 0;
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}
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/* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */
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static int
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store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len)
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{
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int i, ret;
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CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET);
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int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1)
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/ sizeof (PTRACE_TYPE_RET));
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PTRACE_TYPE_RET *buffer;
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int tid = ptid_get_lwp (current_ptid);
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buffer = XALLOCAVEC (PTRACE_TYPE_RET, count);
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if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET))
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if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0)
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return ret;
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if (count > 1)
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if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1)
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* sizeof (PTRACE_TYPE_RET),
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&buffer[count - 1])) != 0)
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return ret;
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memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)),
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myaddr, len);
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for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET))
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if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0)
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return ret;
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return 0;
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}
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/* If the PPU thread is currently stopped on a spu_run system call,
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return to FD and ADDR the file handle and NPC parameter address
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used with the system call. Return non-zero if successful. */
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static int
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parse_spufs_run (int *fd, CORE_ADDR *addr)
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{
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unsigned int insn;
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CORE_ADDR pc = fetch_ppc_register (32); /* nip */
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/* Fetch instruction preceding current NIP. */
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if (fetch_ppc_memory (pc-4, (char *) &insn, 4) != 0)
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return 0;
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/* It should be a "sc" instruction. */
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if (insn != INSTR_SC)
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return 0;
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/* System call number should be NR_spu_run. */
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if (fetch_ppc_register (0) != NR_spu_run)
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return 0;
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/* Register 3 contains fd, register 4 the NPC param pointer. */
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*fd = fetch_ppc_register (34); /* orig_gpr3 */
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*addr = fetch_ppc_register (4);
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return 1;
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}
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/* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF,
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using the /proc file system. */
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static int
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spu_proc_xfer_spu (const char *annex, unsigned char *readbuf,
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const unsigned char *writebuf,
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CORE_ADDR offset, int len)
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{
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char buf[128];
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int fd = 0;
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int ret = -1;
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if (!annex)
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return 0;
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sprintf (buf, "/proc/%ld/fd/%s", ptid_get_lwp (current_ptid), annex);
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fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
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if (fd <= 0)
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return -1;
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if (offset != 0
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&& lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
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{
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close (fd);
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return 0;
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}
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if (writebuf)
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ret = write (fd, writebuf, (size_t) len);
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else if (readbuf)
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ret = read (fd, readbuf, (size_t) len);
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close (fd);
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return ret;
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}
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/* Callback to be used when calling fork_inferior, responsible for
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actually initiating the tracing of the inferior. */
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static void
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spu_ptrace_fun ()
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{
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if (ptrace (PTRACE_TRACEME, 0, 0, 0) < 0)
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trace_start_error_with_name ("ptrace");
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if (setpgid (0, 0) < 0)
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trace_start_error_with_name ("setpgid");
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}
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/* Start an inferior process and returns its pid.
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PROGRAM is the name of the program to be started, and PROGRAM_ARGS
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are its arguments. */
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static int
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spu_create_inferior (const char *program,
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const std::vector<char *> &program_args)
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{
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int pid;
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ptid_t ptid;
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struct process_info *proc;
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std::string str_program_args = stringify_argv (program_args);
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pid = fork_inferior (program,
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str_program_args.c_str (),
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get_environ ()->envp (), spu_ptrace_fun,
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NULL, NULL, NULL, NULL);
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post_fork_inferior (pid, program);
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proc = add_process (pid, 0);
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proc->tdesc = tdesc_spu;
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ptid = ptid_build (pid, pid, 0);
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add_thread (ptid, NULL);
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return pid;
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}
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/* Attach to an inferior process. */
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int
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spu_attach (unsigned long pid)
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{
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ptid_t ptid;
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struct process_info *proc;
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if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
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{
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fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
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strerror (errno), errno);
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fflush (stderr);
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_exit (0177);
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}
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proc = add_process (pid, 1);
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proc->tdesc = tdesc_spu;
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ptid = ptid_build (pid, pid, 0);
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add_thread (ptid, NULL);
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return 0;
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}
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/* Kill the inferior process. */
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static int
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spu_kill (int pid)
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{
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int status, ret;
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struct process_info *process = find_process_pid (pid);
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if (process == NULL)
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return -1;
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ptrace (PTRACE_KILL, pid, 0, 0);
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do {
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ret = waitpid (pid, &status, 0);
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if (WIFEXITED (status) || WIFSIGNALED (status))
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break;
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} while (ret != -1 || errno != ECHILD);
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clear_inferiors ();
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remove_process (process);
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return 0;
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}
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/* Detach from inferior process. */
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static int
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spu_detach (int pid)
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{
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struct process_info *process = find_process_pid (pid);
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if (process == NULL)
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return -1;
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ptrace (PTRACE_DETACH, pid, 0, 0);
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clear_inferiors ();
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remove_process (process);
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return 0;
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}
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static void
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spu_mourn (struct process_info *process)
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{
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remove_process (process);
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}
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static void
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spu_join (int pid)
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{
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int status, ret;
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do {
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ret = waitpid (pid, &status, 0);
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if (WIFEXITED (status) || WIFSIGNALED (status))
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break;
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} while (ret != -1 || errno != ECHILD);
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}
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/* Return nonzero if the given thread is still alive. */
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static int
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spu_thread_alive (ptid_t ptid)
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{
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return ptid_equal (ptid, current_ptid);
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}
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/* Resume process. */
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static void
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spu_resume (struct thread_resume *resume_info, size_t n)
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{
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struct thread_info *thr = get_first_thread ();
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size_t i;
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for (i = 0; i < n; i++)
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if (ptid_equal (resume_info[i].thread, minus_one_ptid)
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|| ptid_equal (resume_info[i].thread, ptid_of (thr)))
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break;
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if (i == n)
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return;
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/* We don't support hardware single-stepping right now, assume
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GDB knows to use software single-stepping. */
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if (resume_info[i].kind == resume_step)
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fprintf (stderr, "Hardware single-step not supported.\n");
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regcache_invalidate ();
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errno = 0;
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ptrace (PTRACE_CONT, ptid_get_lwp (ptid_of (thr)), 0, resume_info[i].sig);
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if (errno)
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perror_with_name ("ptrace");
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}
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/* Wait for process, returns status. */
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static ptid_t
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spu_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
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{
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int pid = ptid_get_pid (ptid);
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int w;
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int ret;
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while (1)
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{
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ret = waitpid (pid, &w, WNOHANG | __WALL | __WNOTHREAD);
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if (ret == -1)
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{
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if (errno != ECHILD)
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perror_with_name ("waitpid");
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}
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else if (ret > 0)
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break;
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usleep (1000);
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}
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/* On the first wait, continue running the inferior until we are
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blocked inside an spu_run system call. */
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if (!server_waiting)
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{
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int fd;
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CORE_ADDR addr;
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while (!parse_spufs_run (&fd, &addr))
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{
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ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);
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waitpid (pid, NULL, __WALL | __WNOTHREAD);
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}
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}
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if (WIFEXITED (w))
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{
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fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
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ourstatus->kind = TARGET_WAITKIND_EXITED;
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ourstatus->value.integer = WEXITSTATUS (w);
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clear_inferiors ();
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return pid_to_ptid (ret);
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}
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else if (!WIFSTOPPED (w))
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{
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fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w));
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clear_inferiors ();
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return pid_to_ptid (ret);
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}
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/* After attach, we may have received a SIGSTOP. Do not return this
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as signal to GDB, or else it will try to continue with SIGSTOP ... */
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if (!server_waiting)
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{
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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ourstatus->value.sig = GDB_SIGNAL_0;
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return ptid_build (ret, ret, 0);
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}
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w));
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return ptid_build (ret, ret, 0);
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}
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/* Fetch inferior registers. */
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static void
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spu_fetch_registers (struct regcache *regcache, int regno)
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{
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int fd;
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CORE_ADDR addr;
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/* We must be stopped on a spu_run system call. */
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if (!parse_spufs_run (&fd, &addr))
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return;
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/* The ID register holds the spufs file handle. */
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if (regno == -1 || regno == SPU_ID_REGNUM)
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supply_register (regcache, SPU_ID_REGNUM, (char *)&fd);
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/* The NPC register is found at ADDR. */
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if (regno == -1 || regno == SPU_PC_REGNUM)
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{
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char buf[4];
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if (fetch_ppc_memory (addr, buf, 4) == 0)
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supply_register (regcache, SPU_PC_REGNUM, buf);
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}
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/* The GPRs are found in the "regs" spufs file. */
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if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS))
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{
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unsigned char buf[16*SPU_NUM_CORE_REGS];
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char annex[32];
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int i;
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sprintf (annex, "%d/regs", fd);
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if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf)
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for (i = 0; i < SPU_NUM_CORE_REGS; i++)
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supply_register (regcache, i, buf + i*16);
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}
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}
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/* Store inferior registers. */
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static void
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spu_store_registers (struct regcache *regcache, int regno)
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{
|
|
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 (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_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 (regcache, 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], lslr_annex[32], buf[32];
|
|
CORE_ADDR lslr;
|
|
|
|
/* 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);
|
|
if (ret > 0)
|
|
return ret == len ? 0 : EIO;
|
|
|
|
/* SPU local store access wraps the address around at the
|
|
local store limit. We emulate this here. To avoid needing
|
|
an extra access to retrieve the LSLR, we only do that after
|
|
trying the original address first, and getting end-of-file. */
|
|
sprintf (lslr_annex, "%d/lslr", fd);
|
|
memset (buf, 0, sizeof buf);
|
|
if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,
|
|
0, sizeof buf) <= 0)
|
|
return ret;
|
|
|
|
lslr = strtoul (buf, NULL, 16);
|
|
ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr & lslr, 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], lslr_annex[32], buf[32];
|
|
CORE_ADDR lslr;
|
|
|
|
/* 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);
|
|
if (ret > 0)
|
|
return ret == len ? 0 : EIO;
|
|
|
|
/* SPU local store access wraps the address around at the
|
|
local store limit. We emulate this here. To avoid needing
|
|
an extra access to retrieve the LSLR, we only do that after
|
|
trying the original address first, and getting end-of-file. */
|
|
sprintf (lslr_annex, "%d/lslr", fd);
|
|
memset (buf, 0, sizeof buf);
|
|
if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL,
|
|
0, sizeof buf) <= 0)
|
|
return ret;
|
|
|
|
lslr = strtoul (buf, NULL, 16);
|
|
ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr & lslr, 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)
|
|
{
|
|
struct thread_info *thr = get_first_thread ();
|
|
|
|
syscall (SYS_tkill, lwpid_of (thr), SIGINT);
|
|
}
|
|
|
|
/* Implementation of the target_ops method "sw_breakpoint_from_kind". */
|
|
|
|
static const gdb_byte *
|
|
spu_sw_breakpoint_from_kind (int kind, int *size)
|
|
{
|
|
*size = sizeof breakpoint;
|
|
return breakpoint;
|
|
}
|
|
|
|
static struct target_ops spu_target_ops = {
|
|
spu_create_inferior,
|
|
NULL, /* post_create_inferior */
|
|
spu_attach,
|
|
spu_kill,
|
|
spu_detach,
|
|
spu_mourn,
|
|
spu_join,
|
|
spu_thread_alive,
|
|
spu_resume,
|
|
spu_wait,
|
|
spu_fetch_registers,
|
|
spu_store_registers,
|
|
NULL, /* prepare_to_access_memory */
|
|
NULL, /* done_accessing_memory */
|
|
spu_read_memory,
|
|
spu_write_memory,
|
|
spu_look_up_symbols,
|
|
spu_request_interrupt,
|
|
NULL,
|
|
NULL, /* supports_z_point_type */
|
|
NULL,
|
|
NULL,
|
|
NULL, /* stopped_by_sw_breakpoint */
|
|
NULL, /* supports_stopped_by_sw_breakpoint */
|
|
NULL, /* stopped_by_hw_breakpoint */
|
|
NULL, /* supports_stopped_by_hw_breakpoint */
|
|
NULL, /* supports_hardware_single_step */
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
spu_proc_xfer_spu,
|
|
hostio_last_error_from_errno,
|
|
NULL, /* qxfer_osdata */
|
|
NULL, /* qxfer_siginfo */
|
|
NULL, /* supports_non_stop */
|
|
NULL, /* async */
|
|
NULL, /* start_non_stop */
|
|
NULL, /* supports_multi_process */
|
|
NULL, /* supports_fork_events */
|
|
NULL, /* supports_vfork_events */
|
|
NULL, /* supports_exec_events */
|
|
NULL, /* handle_new_gdb_connection */
|
|
NULL, /* handle_monitor_command */
|
|
NULL, /* core_of_thread */
|
|
NULL, /* read_loadmap */
|
|
NULL, /* process_qsupported */
|
|
NULL, /* supports_tracepoints */
|
|
NULL, /* read_pc */
|
|
NULL, /* write_pc */
|
|
NULL, /* thread_stopped */
|
|
NULL, /* get_tib_address */
|
|
NULL, /* pause_all */
|
|
NULL, /* unpause_all */
|
|
NULL, /* stabilize_threads */
|
|
NULL, /* install_fast_tracepoint_jump_pad */
|
|
NULL, /* emit_ops */
|
|
NULL, /* supports_disable_randomization */
|
|
NULL, /* get_min_fast_tracepoint_insn_len */
|
|
NULL, /* qxfer_libraries_svr4 */
|
|
NULL, /* support_agent */
|
|
NULL, /* enable_btrace */
|
|
NULL, /* disable_btrace */
|
|
NULL, /* read_btrace */
|
|
NULL, /* read_btrace_conf */
|
|
NULL, /* supports_range_stepping */
|
|
NULL, /* pid_to_exec_file */
|
|
NULL, /* multifs_open */
|
|
NULL, /* multifs_unlink */
|
|
NULL, /* multifs_readlink */
|
|
NULL, /* breakpoint_kind_from_pc */
|
|
spu_sw_breakpoint_from_kind,
|
|
};
|
|
|
|
void
|
|
initialize_low (void)
|
|
{
|
|
set_target_ops (&spu_target_ops);
|
|
init_registers_spu ();
|
|
}
|