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396 lines
12 KiB
C
396 lines
12 KiB
C
/* Cell SPU GNU/Linux multi-architecture debugging support.
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Copyright (C) 2009, 2010 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 "defs.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "gdb_string.h"
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#include "gdb_assert.h"
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#include "arch-utils.h"
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#include "observer.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "solib.h"
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#include "solist.h"
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#include "ppc-tdep.h"
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#include "ppc-linux-tdep.h"
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#include "spu-tdep.h"
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/* This module's target vector. */
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static struct target_ops spu_ops;
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/* Number of SPE objects loaded into the current inferior. */
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static int spu_nr_solib;
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/* Stand-alone SPE executable? */
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#define spu_standalone_p() \
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(symfile_objfile && symfile_objfile->obfd \
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&& bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu)
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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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/* 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 (ptid_t ptid, int *fd, CORE_ADDR *addr)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
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struct gdbarch_tdep *tdep;
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struct regcache *regcache;
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char buf[4];
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CORE_ADDR pc;
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ULONGEST regval;
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/* If we're not on PPU, there's nothing to detect. */
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if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_powerpc)
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return 0;
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/* Get PPU-side registers. */
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regcache = get_thread_arch_regcache (ptid, target_gdbarch);
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tdep = gdbarch_tdep (target_gdbarch);
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/* Fetch instruction preceding current NIP. */
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if (target_read_memory (regcache_read_pc (regcache) - 4, buf, 4) != 0)
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return 0;
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/* It should be a "sc" instruction. */
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if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC)
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return 0;
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/* System call number should be NR_spu_run. */
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regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum, ®val);
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if (regval != 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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regcache_cooked_read_unsigned (regcache, PPC_ORIG_R3_REGNUM, ®val);
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*fd = (int) regval;
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regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 4, ®val);
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*addr = (CORE_ADDR) regval;
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return 1;
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}
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/* Find gdbarch for SPU context SPUFS_FD. */
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static struct gdbarch *
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spu_gdbarch (int spufs_fd)
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{
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struct gdbarch_info info;
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gdbarch_info_init (&info);
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info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu);
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info.byte_order = BFD_ENDIAN_BIG;
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info.osabi = GDB_OSABI_LINUX;
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info.tdep_info = (void *) &spufs_fd;
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return gdbarch_find_by_info (info);
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}
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/* Override the to_thread_architecture routine. */
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static struct gdbarch *
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spu_thread_architecture (struct target_ops *ops, ptid_t ptid)
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{
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int spufs_fd;
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CORE_ADDR spufs_addr;
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if (parse_spufs_run (ptid, &spufs_fd, &spufs_addr))
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return spu_gdbarch (spufs_fd);
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return target_gdbarch;
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}
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/* Override the to_region_ok_for_hw_watchpoint routine. */
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static int
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spu_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
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{
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struct target_ops *ops_beneath = find_target_beneath (&spu_ops);
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while (ops_beneath && !ops_beneath->to_region_ok_for_hw_watchpoint)
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ops_beneath = find_target_beneath (ops_beneath);
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/* We cannot watch SPU local store. */
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if (SPUADDR_SPU (addr) != -1)
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return 0;
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if (ops_beneath)
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return ops_beneath->to_region_ok_for_hw_watchpoint (addr, len);
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return 0;
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}
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/* Override the to_fetch_registers routine. */
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static void
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spu_fetch_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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struct target_ops *ops_beneath = find_target_beneath (ops);
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int spufs_fd;
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CORE_ADDR spufs_addr;
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/* This version applies only if we're currently in spu_run. */
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if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
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{
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while (ops_beneath && !ops_beneath->to_fetch_registers)
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ops_beneath = find_target_beneath (ops_beneath);
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gdb_assert (ops_beneath);
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ops_beneath->to_fetch_registers (ops_beneath, regcache, regno);
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return;
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}
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/* We must be stopped on a spu_run system call. */
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if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_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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{
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char buf[4];
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store_unsigned_integer (buf, 4, byte_order, spufs_fd);
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regcache_raw_supply (regcache, SPU_ID_REGNUM, buf);
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}
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/* The NPC register is found in PPC memory at SPUFS_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 (target_read (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
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buf, spufs_addr, sizeof buf) == sizeof buf)
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regcache_raw_supply (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_GPRS))
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{
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char buf[16 * SPU_NUM_GPRS], annex[32];
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int i;
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xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
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if (target_read (ops_beneath, TARGET_OBJECT_SPU, annex,
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buf, 0, sizeof buf) == sizeof buf)
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for (i = 0; i < SPU_NUM_GPRS; i++)
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regcache_raw_supply (regcache, i, buf + i*16);
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}
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}
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/* Override the to_store_registers routine. */
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static void
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spu_store_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct target_ops *ops_beneath = find_target_beneath (ops);
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int spufs_fd;
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CORE_ADDR spufs_addr;
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/* This version applies only if we're currently in spu_run. */
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if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
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{
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while (ops_beneath && !ops_beneath->to_fetch_registers)
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ops_beneath = find_target_beneath (ops_beneath);
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gdb_assert (ops_beneath);
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ops_beneath->to_store_registers (ops_beneath, regcache, regno);
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return;
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}
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/* We must be stopped on a spu_run system call. */
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if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
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return;
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/* The NPC register is found in PPC memory at SPUFS_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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regcache_raw_collect (regcache, SPU_PC_REGNUM, buf);
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target_write (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
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buf, spufs_addr, sizeof 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_GPRS))
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{
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char buf[16 * SPU_NUM_GPRS], annex[32];
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int i;
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for (i = 0; i < SPU_NUM_GPRS; i++)
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regcache_raw_collect (regcache, i, buf + i*16);
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xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
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target_write (ops_beneath, TARGET_OBJECT_SPU, annex,
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buf, 0, sizeof buf);
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}
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}
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/* Override the to_xfer_partial routine. */
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static LONGEST
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spu_xfer_partial (struct target_ops *ops, enum target_object object,
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const char *annex, gdb_byte *readbuf,
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const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
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{
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struct target_ops *ops_beneath = find_target_beneath (ops);
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while (ops_beneath && !ops_beneath->to_xfer_partial)
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ops_beneath = find_target_beneath (ops_beneath);
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gdb_assert (ops_beneath);
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/* Use the "mem" spufs file to access SPU local store. */
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if (object == TARGET_OBJECT_MEMORY)
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{
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int fd = SPUADDR_SPU (offset);
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CORE_ADDR addr = SPUADDR_ADDR (offset);
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char mem_annex[32];
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if (fd >= 0 && addr < SPU_LS_SIZE)
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{
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xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
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return ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
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mem_annex, readbuf, writebuf,
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addr, len);
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}
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}
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return ops_beneath->to_xfer_partial (ops_beneath, object, annex,
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readbuf, writebuf, offset, len);
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}
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/* Override the to_search_memory routine. */
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static int
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spu_search_memory (struct target_ops* ops,
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CORE_ADDR start_addr, ULONGEST search_space_len,
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const gdb_byte *pattern, ULONGEST pattern_len,
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CORE_ADDR *found_addrp)
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{
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struct target_ops *ops_beneath = find_target_beneath (ops);
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while (ops_beneath && !ops_beneath->to_search_memory)
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ops_beneath = find_target_beneath (ops_beneath);
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/* For SPU local store, always fall back to the simple method. Likewise
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if we do not have any target-specific special implementation. */
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if (!ops_beneath || SPUADDR_SPU (start_addr) >= 0)
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return simple_search_memory (ops,
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start_addr, search_space_len,
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pattern, pattern_len, found_addrp);
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return ops_beneath->to_search_memory (ops_beneath,
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start_addr, search_space_len,
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pattern, pattern_len, found_addrp);
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}
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/* Push and pop the SPU multi-architecture support target. */
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static void
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spu_multiarch_activate (void)
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{
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/* If GDB was configured without SPU architecture support,
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we cannot install SPU multi-architecture support either. */
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if (spu_gdbarch (-1) == NULL)
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return;
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push_target (&spu_ops);
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/* Make sure the thread architecture is re-evaluated. */
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registers_changed ();
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}
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static void
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spu_multiarch_deactivate (void)
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{
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unpush_target (&spu_ops);
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/* Make sure the thread architecture is re-evaluated. */
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registers_changed ();
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}
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static void
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spu_multiarch_inferior_created (struct target_ops *ops, int from_tty)
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{
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if (spu_standalone_p ())
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spu_multiarch_activate ();
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}
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static void
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spu_multiarch_solib_loaded (struct so_list *so)
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{
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if (!spu_standalone_p ())
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if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
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if (spu_nr_solib++ == 0)
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spu_multiarch_activate ();
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}
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static void
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spu_multiarch_solib_unloaded (struct so_list *so)
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{
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if (!spu_standalone_p ())
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if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
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if (--spu_nr_solib == 0)
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spu_multiarch_deactivate ();
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}
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static void
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spu_mourn_inferior (struct target_ops *ops)
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{
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struct target_ops *ops_beneath = find_target_beneath (ops);
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while (ops_beneath && !ops_beneath->to_mourn_inferior)
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ops_beneath = find_target_beneath (ops_beneath);
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gdb_assert (ops_beneath);
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ops_beneath->to_mourn_inferior (ops_beneath);
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spu_multiarch_deactivate ();
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}
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/* Initialize the SPU multi-architecture support target. */
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static void
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init_spu_ops (void)
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{
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spu_ops.to_shortname = "spu";
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spu_ops.to_longname = "SPU multi-architecture support.";
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spu_ops.to_doc = "SPU multi-architecture support.";
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spu_ops.to_mourn_inferior = spu_mourn_inferior;
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spu_ops.to_fetch_registers = spu_fetch_registers;
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spu_ops.to_store_registers = spu_store_registers;
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spu_ops.to_xfer_partial = spu_xfer_partial;
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spu_ops.to_search_memory = spu_search_memory;
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spu_ops.to_region_ok_for_hw_watchpoint = spu_region_ok_for_hw_watchpoint;
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spu_ops.to_thread_architecture = spu_thread_architecture;
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spu_ops.to_stratum = arch_stratum;
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spu_ops.to_magic = OPS_MAGIC;
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}
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void
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_initialize_spu_multiarch (void)
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{
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/* Install ourselves on the target stack. */
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init_spu_ops ();
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add_target (&spu_ops);
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/* Install observers to watch for SPU objects. */
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observer_attach_inferior_created (spu_multiarch_inferior_created);
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observer_attach_solib_loaded (spu_multiarch_solib_loaded);
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observer_attach_solib_unloaded (spu_multiarch_solib_unloaded);
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}
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