gdb/spu-multiarch.c - gdb

Global variables defined

Functions defined

Macros defined

Source code

  1. /* Cell SPU GNU/Linux multi-architecture debugging support.
  2.    Copyright (C) 2009-2015 Free Software Foundation, Inc.

  4.    Contributed by Ulrich Weigand <uweigand@de.ibm.com>.

  6.    This file is part of GDB.

  8.    This program is free software; you can redistribute it and/or modify
  9.    it under the terms of the GNU General Public License as published by
  10.    the Free Software Foundation; either version 3 of the License, or
  11.    (at your option) any later version.

  13.    This program is distributed in the hope that it will be useful,
  14.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16.    GNU General Public License for more details.

  18.    You should have received a copy of the GNU General Public License
  19.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  21. #include "defs.h"
  22. #include "gdbcore.h"
  23. #include "gdbcmd.h"
  24. #include "arch-utils.h"
  25. #include "observer.h"
  26. #include "inferior.h"
  27. #include "regcache.h"
  28. #include "symfile.h"
  29. #include "objfiles.h"
  30. #include "solib.h"
  31. #include "solist.h"

  33. #include "ppc-tdep.h"
  34. #include "ppc-linux-tdep.h"
  35. #include "spu-tdep.h"

  37. /* This module's target vector.  */
  38. ‌static struct target_ops spu_ops;

  40. /* Number of SPE objects loaded into the current inferior.  */
  41. ‌static int spu_nr_solib;

  43. /* Stand-alone SPE executable?  */
  44. ‌#define spu_standalone_p() \
  45.   (symfile_objfile && symfile_objfile->obfd \
  46.    && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu)

  48. /* PPU side system calls.  */
  49. ‌#define INSTR_SC        0x44000002
  50. ‌#define NR_spu_run        0x0116

  52. /* If the PPU thread is currently stopped on a spu_run system call,
  53.    return to FD and ADDR the file handle and NPC parameter address
  54.    used with the system call.  Return non-zero if successful.  */
  55. static int
  56. ‌parse_spufs_run (ptid_t ptid, int *fd, CORE_ADDR *addr)
  57. {
  58.   enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
  59.   struct gdbarch_tdep *tdep;
  60.   struct regcache *regcache;
  61.   gdb_byte buf[4];
  62.   ULONGEST regval;

  64.   /* If we're not on PPU, there's nothing to detect.  */
  65.   if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_powerpc)
  66.     return 0;

  68.   /* Get PPU-side registers.  */
  69.   regcache = get_thread_arch_regcache (ptid, target_gdbarch ());
  70.   tdep = gdbarch_tdep (target_gdbarch ());

  72.   /* Fetch instruction preceding current NIP.  */
  73.   if (target_read_memory (regcache_read_pc (regcache) - 4, buf, 4) != 0)
  74.     return 0;
  75.   /* It should be a "sc" instruction.  */
  76.   if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC)
  77.     return 0;
  78.   /* System call number should be NR_spu_run.  */
  79.   regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum, &regval);
  80.   if (regval != NR_spu_run)
  81.     return 0;

  83.   /* Register 3 contains fd, register 4 the NPC param pointer.  */
  84.   regcache_cooked_read_unsigned (regcache, PPC_ORIG_R3_REGNUM, &regval);
  85.   *fd = (int) regval;
  86.   regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 4, &regval);
  87.   *addr = (CORE_ADDR) regval;
  88.   return 1;
  89. }

  91. /* Find gdbarch for SPU context SPUFS_FD.  */
  92. static struct gdbarch *
  93. ‌spu_gdbarch (int spufs_fd)
  94. {
  95.   struct gdbarch_info info;
  96.   gdbarch_info_init (&info);
  97.   info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu);
  98.   info.byte_order = BFD_ENDIAN_BIG;
  99.   info.osabi = GDB_OSABI_LINUX;
  100.   info.tdep_info = (void *) &spufs_fd;
  101.   return gdbarch_find_by_info (info);
  102. }

  104. /* Override the to_thread_architecture routine.  */
  105. static struct gdbarch *
  106. ‌spu_thread_architecture (struct target_ops *ops, ptid_t ptid)
  107. {
  108.   int spufs_fd;
  109.   CORE_ADDR spufs_addr;

  111.   if (parse_spufs_run (ptid, &spufs_fd, &spufs_addr))
  112.     return spu_gdbarch (spufs_fd);

  114.   return target_gdbarch ();
  115. }

  117. /* Override the to_region_ok_for_hw_watchpoint routine.  */
  118. static int
  119. ‌spu_region_ok_for_hw_watchpoint (struct target_ops *self,
  120.                                  CORE_ADDR addr, int len)
  121. {
  122.   struct target_ops *ops_beneath = find_target_beneath (self);

  124.   /* We cannot watch SPU local store.  */
  125.   if (SPUADDR_SPU (addr) != -1)
  126.     return 0;

  128.   return ops_beneath->to_region_ok_for_hw_watchpoint (ops_beneath, addr, len);
  129. }

  131. /* Override the to_fetch_registers routine.  */
  132. static void
  133. ‌spu_fetch_registers (struct target_ops *ops,
  134.                      struct regcache *regcache, int regno)
  135. {
  136.   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  137.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  138.   struct target_ops *ops_beneath = find_target_beneath (ops);
  139.   int spufs_fd;
  140.   CORE_ADDR spufs_addr;

  142.   /* This version applies only if we're currently in spu_run.  */
  143.   if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
  144.     {
  145.       ops_beneath->to_fetch_registers (ops_beneath, regcache, regno);
  146.       return;
  147.     }

  149.   /* We must be stopped on a spu_run system call.  */
  150.   if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
  151.     return;

  153.   /* The ID register holds the spufs file handle.  */
  154.   if (regno == -1 || regno == SPU_ID_REGNUM)
  155.     {
  156.       gdb_byte buf[4];
  157.       store_unsigned_integer (buf, 4, byte_order, spufs_fd);
  158.       regcache_raw_supply (regcache, SPU_ID_REGNUM, buf);
  159.     }

  161.   /* The NPC register is found in PPC memory at SPUFS_ADDR.  */
  162.   if (regno == -1 || regno == SPU_PC_REGNUM)
  163.     {
  164.       gdb_byte buf[4];

  166.       if (target_read (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
  167.                        buf, spufs_addr, sizeof buf) == sizeof buf)
  168.         regcache_raw_supply (regcache, SPU_PC_REGNUM, buf);
  169.     }

  171.   /* The GPRs are found in the "regs" spufs file.  */
  172.   if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
  173.     {
  174.       gdb_byte buf[16 * SPU_NUM_GPRS];
  175.       char annex[32];
  176.       int i;

  178.       xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
  179.       if (target_read (ops_beneath, TARGET_OBJECT_SPU, annex,
  180.                        buf, 0, sizeof buf) == sizeof buf)
  181.         for (i = 0; i < SPU_NUM_GPRS; i++)
  182.           regcache_raw_supply (regcache, i, buf + i*16);
  183.     }
  184. }

  186. /* Override the to_store_registers routine.  */
  187. static void
  188. ‌spu_store_registers (struct target_ops *ops,
  189.                      struct regcache *regcache, int regno)
  190. {
  191.   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  192.   struct target_ops *ops_beneath = find_target_beneath (ops);
  193.   int spufs_fd;
  194.   CORE_ADDR spufs_addr;

  196.   /* This version applies only if we're currently in spu_run.  */
  197.   if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu)
  198.     {
  199.       ops_beneath->to_store_registers (ops_beneath, regcache, regno);
  200.       return;
  201.     }

  203.   /* We must be stopped on a spu_run system call.  */
  204.   if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr))
  205.     return;

  207.   /* The NPC register is found in PPC memory at SPUFS_ADDR.  */
  208.   if (regno == -1 || regno == SPU_PC_REGNUM)
  209.     {
  210.       gdb_byte buf[4];
  211.       regcache_raw_collect (regcache, SPU_PC_REGNUM, buf);

  213.       target_write (ops_beneath, TARGET_OBJECT_MEMORY, NULL,
  214.                     buf, spufs_addr, sizeof buf);
  215.     }

  217.   /* The GPRs are found in the "regs" spufs file.  */
  218.   if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
  219.     {
  220.       gdb_byte buf[16 * SPU_NUM_GPRS];
  221.       char annex[32];
  222.       int i;

  224.       for (i = 0; i < SPU_NUM_GPRS; i++)
  225.         regcache_raw_collect (regcache, i, buf + i*16);

  227.       xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd);
  228.       target_write (ops_beneath, TARGET_OBJECT_SPU, annex,
  229.                     buf, 0, sizeof buf);
  230.     }
  231. }

  233. /* Override the to_xfer_partial routine.  */
  234. static enum target_xfer_status
  235. ‌spu_xfer_partial (struct target_ops *ops, enum target_object object,
  236.                   const char *annex, gdb_byte *readbuf,
  237.                   const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
  238.                   ULONGEST *xfered_len)
  239. {
  240.   struct target_ops *ops_beneath = find_target_beneath (ops);

  242.   /* Use the "mem" spufs file to access SPU local store.  */
  243.   if (object == TARGET_OBJECT_MEMORY)
  244.     {
  245.       int fd = SPUADDR_SPU (offset);
  246.       CORE_ADDR addr = SPUADDR_ADDR (offset);
  247.       char mem_annex[32], lslr_annex[32];
  248.       gdb_byte buf[32];
  249.       ULONGEST lslr;
  250.       enum target_xfer_status ret;

  252.       if (fd >= 0)
  253.         {
  254.           xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
  255.           ret = ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
  256.                                               mem_annex, readbuf, writebuf,
  257.                                               addr, len, xfered_len);
  258.           if (ret == TARGET_XFER_OK)
  259.             return ret;

  261.           /* SPU local store access wraps the address around at the
  262.              local store limit.  We emulate this here.  To avoid needing
  263.              an extra access to retrieve the LSLR, we only do that after
  264.              trying the original address first, and getting end-of-file.  */
  265.           xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd);
  266.           memset (buf, 0, sizeof buf);
  267.           if (ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
  268.                                             lslr_annex, buf, NULL,
  269.                                             0, sizeof buf, xfered_len)
  270.               != TARGET_XFER_OK)
  271.             return ret;

  273.           lslr = strtoulst ((char *) buf, NULL, 16);
  274.           return ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU,
  275.                                                mem_annex, readbuf, writebuf,
  276.                                                addr & lslr, len, xfered_len);
  277.         }
  278.     }

  280.   return ops_beneath->to_xfer_partial (ops_beneath, object, annex,
  281.                                        readbuf, writebuf, offset, len, xfered_len);
  282. }

  284. /* Override the to_search_memory routine.  */
  285. static int
  286. ‌spu_search_memory (struct target_ops* ops,
  287.                    CORE_ADDR start_addr, ULONGEST search_space_len,
  288.                    const gdb_byte *pattern, ULONGEST pattern_len,
  289.                    CORE_ADDR *found_addrp)
  290. {
  291.   struct target_ops *ops_beneath = find_target_beneath (ops);

  293.   /* For SPU local store, always fall back to the simple method.  */
  294.   if (SPUADDR_SPU (start_addr) >= 0)
  295.     return simple_search_memory (ops,
  296.                                  start_addr, search_space_len,
  297.                                  pattern, pattern_len, found_addrp);

  299.   return ops_beneath->to_search_memory (ops_beneath,
  300.                                         start_addr, search_space_len,
  301.                                         pattern, pattern_len, found_addrp);
  302. }


  305. /* Push and pop the SPU multi-architecture support target.  */

  307. static void
  308. ‌spu_multiarch_activate (void)
  309. {
  310.   /* If GDB was configured without SPU architecture support,
  311.      we cannot install SPU multi-architecture support either.  */
  312.   if (spu_gdbarch (-1) == NULL)
  313.     return;

  315.   push_target (&spu_ops);

  317.   /* Make sure the thread architecture is re-evaluated.  */
  318.   registers_changed ();
  319. }

  321. static void
  322. ‌spu_multiarch_deactivate (void)
  323. {
  324.   unpush_target (&spu_ops);

  326.   /* Make sure the thread architecture is re-evaluated.  */
  327.   registers_changed ();
  328. }

  330. static void
  331. ‌spu_multiarch_inferior_created (struct target_ops *ops, int from_tty)
  332. {
  333.   if (spu_standalone_p ())
  334.     spu_multiarch_activate ();
  335. }

  337. static void
  338. ‌spu_multiarch_solib_loaded (struct so_list *so)
  339. {
  340.   if (!spu_standalone_p ())
  341.     if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
  342.       if (spu_nr_solib++ == 0)
  343.         spu_multiarch_activate ();
  344. }

  346. static void
  347. ‌spu_multiarch_solib_unloaded (struct so_list *so)
  348. {
  349.   if (!spu_standalone_p ())
  350.     if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu)
  351.       if (--spu_nr_solib == 0)
  352.         spu_multiarch_deactivate ();
  353. }

  355. static void
  356. ‌spu_mourn_inferior (struct target_ops *ops)
  357. {
  358.   struct target_ops *ops_beneath = find_target_beneath (ops);

  360.   ops_beneath->to_mourn_inferior (ops_beneath);
  361.   spu_multiarch_deactivate ();
  362. }


  365. /* Initialize the SPU multi-architecture support target.  */

  367. static void
  368. ‌init_spu_ops (void)
  369. {
  370.   spu_ops.to_shortname = "spu";
  371.   spu_ops.to_longname = "SPU multi-architecture support.";
  372.   spu_ops.to_doc = "SPU multi-architecture support.";
  373.   spu_ops.to_mourn_inferior = spu_mourn_inferior;
  374.   spu_ops.to_fetch_registers = spu_fetch_registers;
  375.   spu_ops.to_store_registers = spu_store_registers;
  376.   spu_ops.to_xfer_partial = spu_xfer_partial;
  377.   spu_ops.to_search_memory = spu_search_memory;
  378.   spu_ops.to_region_ok_for_hw_watchpoint = spu_region_ok_for_hw_watchpoint;
  379.   spu_ops.to_thread_architecture = spu_thread_architecture;
  380.   spu_ops.to_stratum = arch_stratum;
  381.   spu_ops.to_magic = OPS_MAGIC;
  382. }

  384. /* -Wmissing-prototypes */
  385. extern initialize_file_ftype _initialize_spu_multiarch;

  387. void
  388. ‌_initialize_spu_multiarch (void)
  389. {
  390.   /* Install ourselves on the target stack.  */
  391.   init_spu_ops ();
  392.   complete_target_initialization (&spu_ops);

  394.   /* Install observers to watch for SPU objects.  */
  395.   observer_attach_inferior_created (spu_multiarch_inferior_created);
  396.   observer_attach_solib_loaded (spu_multiarch_solib_loaded);
  397.   observer_attach_solib_unloaded (spu_multiarch_solib_unloaded);
  398. }