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Diffstat (limited to 'gdb/solib-spu.c')
| -rw-r--r-- | gdb/solib-spu.c | 547 |
1 files changed, 0 insertions, 547 deletions
diff --git a/gdb/solib-spu.c b/gdb/solib-spu.c deleted file mode 100644 index 49e470a..0000000 --- a/gdb/solib-spu.c +++ /dev/null @@ -1,547 +0,0 @@ -/* Cell SPU GNU/Linux support -- shared library handling. - Copyright (C) 2009-2019 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 3 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, see <http://www.gnu.org/licenses/>. */ - -#include "defs.h" -#include "solib-spu.h" -#include "gdbcore.h" -#include <sys/stat.h> -#include "arch-utils.h" -#include "bfd.h" -#include "symtab.h" -#include "solib.h" -#include "solib-svr4.h" -#include "solist.h" -#include "inferior.h" -#include "objfiles.h" -#include "observable.h" -#include "breakpoint.h" -#include "gdbthread.h" -#include "gdb_bfd.h" - -#include "spu-tdep.h" - -/* Highest SPE id (file handle) the inferior may have. */ -#define MAX_SPE_FD 1024 - -/* Stand-alone SPE executable? */ -#define spu_standalone_p() \ - (symfile_objfile && symfile_objfile->obfd \ - && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu) - - -/* Relocate main SPE executable. */ -static void -spu_relocate_main_executable (int spufs_fd) -{ - struct section_offsets *new_offsets; - int i; - - if (symfile_objfile == NULL) - return; - - new_offsets = XALLOCAVEC (struct section_offsets, - symfile_objfile->num_sections); - - for (i = 0; i < symfile_objfile->num_sections; i++) - new_offsets->offsets[i] = SPUADDR (spufs_fd, 0); - - objfile_relocate (symfile_objfile, new_offsets); -} - -/* When running a stand-alone SPE executable, we may need to skip one more - exec event on startup, to get past the binfmt_misc loader. */ -static void -spu_skip_standalone_loader (void) -{ - if (target_has_execution && !current_inferior ()->attach_flag) - { - struct target_waitstatus ws; - - /* Only some kernels report an extra SIGTRAP with the binfmt_misc - loader; others do not. In addition, if we have attached to an - already running inferior instead of starting a new one, we will - not see the extra SIGTRAP -- and we cannot readily distinguish - the two cases, in particular with the extended-remote target. - - Thus we issue a single-step here. If no extra SIGTRAP was pending, - this will step past the first instruction of the stand-alone SPE - executable loader, but we don't care about that. */ - - inferior_thread ()->control.in_infcall = 1; /* Suppress MI messages. */ - - target_resume (inferior_ptid, 1, GDB_SIGNAL_0); - target_wait (minus_one_ptid, &ws, 0); - set_executing (minus_one_ptid, 0); - - inferior_thread ()->control.in_infcall = 0; - } -} - -static objfile_key<CORE_ADDR, gdb::noop_deleter<CORE_ADDR>> - ocl_program_data_key; - -/* Appends OpenCL programs to the list of `struct so_list' objects. */ -static void -append_ocl_sos (struct so_list **link_ptr) -{ - CORE_ADDR *ocl_program_addr_base; - - for (objfile *objfile : current_program_space->objfiles ()) - { - ocl_program_addr_base = ocl_program_data_key.get (objfile); - if (ocl_program_addr_base != NULL) - { - enum bfd_endian byte_order = bfd_big_endian (objfile->obfd)? - BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; - try - { - CORE_ADDR data = - read_memory_unsigned_integer (*ocl_program_addr_base, - sizeof (CORE_ADDR), - byte_order); - if (data != 0x0) - { - struct so_list *newobj; - - /* Allocate so_list structure. */ - newobj = XCNEW (struct so_list); - - /* Encode FD and object ID in path name. */ - xsnprintf (newobj->so_name, sizeof newobj->so_name, "@%s <%d>", - hex_string (data), - SPUADDR_SPU (*ocl_program_addr_base)); - strcpy (newobj->so_original_name, newobj->so_name); - - *link_ptr = newobj; - link_ptr = &newobj->next; - } - } - catch (const gdb_exception &ex) - { - /* Ignore memory errors. */ - switch (ex.error) - { - case MEMORY_ERROR: - break; - default: - throw; - break; - } - } - } - } -} - -/* Build a list of `struct so_list' objects describing the shared - objects currently loaded in the inferior. */ -static struct so_list * -spu_current_sos (void) -{ - enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); - struct so_list *head; - struct so_list **link_ptr; - - gdb_byte buf[MAX_SPE_FD * 4]; - int i, size; - - /* First, retrieve the SVR4 shared library list. */ - head = svr4_so_ops.current_sos (); - - /* Append our libraries to the end of the list. */ - for (link_ptr = &head; *link_ptr; link_ptr = &(*link_ptr)->next) - ; - - /* Determine list of SPU ids. */ - size = target_read (current_top_target (), TARGET_OBJECT_SPU, NULL, - buf, 0, sizeof buf); - - /* Do not add stand-alone SPE executable context as shared library, - but relocate main SPE executable objfile. */ - if (spu_standalone_p ()) - { - if (size == 4) - { - int fd = extract_unsigned_integer (buf, 4, byte_order); - - spu_relocate_main_executable (fd); - - /* Re-enable breakpoints after main SPU context was established; - see also comments in spu_solib_create_inferior_hook. */ - enable_breakpoints_after_startup (); - } - - return head; - } - - /* Create an so_list entry for each SPU id. */ - for (i = 0; i < size; i += 4) - { - int fd = extract_unsigned_integer (buf + i, 4, byte_order); - struct so_list *newobj; - - unsigned long long addr; - char annex[32], id[100]; - int len; - - /* Read object ID. There's a race window where the inferior may have - already created the SPE context, but not installed the object-id - yet. Skip such entries; we'll be back for them later. */ - xsnprintf (annex, sizeof annex, "%d/object-id", fd); - len = target_read (current_top_target (), TARGET_OBJECT_SPU, annex, - (gdb_byte *) id, 0, sizeof id); - if (len <= 0 || len >= sizeof id) - continue; - id[len] = 0; - if (sscanf (id, "0x%llx", &addr) != 1 || !addr) - continue; - - /* Allocate so_list structure. */ - newobj = XCNEW (struct so_list); - - /* Encode FD and object ID in path name. Choose the name so as not - to conflict with any (normal) SVR4 library path name. */ - xsnprintf (newobj->so_name, sizeof newobj->so_name, "@%s <%d>", - hex_string (addr), fd); - strcpy (newobj->so_original_name, newobj->so_name); - - *link_ptr = newobj; - link_ptr = &newobj->next; - } - - /* Append OpenCL sos. */ - append_ocl_sos (link_ptr); - - return head; -} - -/* Free so_list information. */ -static void -spu_free_so (struct so_list *so) -{ - if (so->so_original_name[0] != '@') - svr4_so_ops.free_so (so); -} - -/* Relocate section addresses. */ -static void -spu_relocate_section_addresses (struct so_list *so, - struct target_section *sec) -{ - if (so->so_original_name[0] != '@') - svr4_so_ops.relocate_section_addresses (so, sec); - else - { - unsigned long long addr; - int fd; - - /* Set addr_low/high to just LS offset for display. */ - if (so->addr_low == 0 && so->addr_high == 0 - && strcmp (sec->the_bfd_section->name, ".text") == 0) - { - so->addr_low = sec->addr; - so->addr_high = sec->endaddr; - } - - /* Decode object ID. */ - if (sscanf (so->so_original_name, "@0x%llx <%d>", &addr, &fd) != 2) - internal_error (__FILE__, __LINE__, "bad object ID"); - - sec->addr = SPUADDR (fd, sec->addr); - sec->endaddr = SPUADDR (fd, sec->endaddr); - } -} - - -/* Inferior memory should contain an SPE executable image at location ADDR. - Allocate a BFD representing that executable. Return NULL on error. */ - -static void * -spu_bfd_iovec_open (bfd *nbfd, void *open_closure) -{ - return open_closure; -} - -static int -spu_bfd_iovec_close (bfd *nbfd, void *stream) -{ - xfree (stream); - - /* Zero means success. */ - return 0; -} - -static file_ptr -spu_bfd_iovec_pread (bfd *abfd, void *stream, void *buf, - file_ptr nbytes, file_ptr offset) -{ - CORE_ADDR addr = *(CORE_ADDR *)stream; - int ret; - - ret = target_read_memory (addr + offset, (gdb_byte *) buf, nbytes); - if (ret != 0) - { - bfd_set_error (bfd_error_invalid_operation); - return -1; - } - - return nbytes; -} - -static int -spu_bfd_iovec_stat (bfd *abfd, void *stream, struct stat *sb) -{ - /* We don't have an easy way of finding the size of embedded spu - images. We could parse the in-memory ELF header and section - table to find the extent of the last section but that seems - pointless when the size is needed only for checks of other - parsed values in dbxread.c. */ - memset (sb, 0, sizeof (struct stat)); - sb->st_size = INT_MAX; - return 0; -} - -static gdb_bfd_ref_ptr -spu_bfd_fopen (const char *name, CORE_ADDR addr) -{ - CORE_ADDR *open_closure = XNEW (CORE_ADDR); - - *open_closure = addr; - - gdb_bfd_ref_ptr nbfd (gdb_bfd_openr_iovec (name, "elf32-spu", - spu_bfd_iovec_open, open_closure, - spu_bfd_iovec_pread, - spu_bfd_iovec_close, - spu_bfd_iovec_stat)); - if (nbfd == NULL) - return NULL; - - if (!bfd_check_format (nbfd.get (), bfd_object)) - return NULL; - - return nbfd; -} - -/* Open shared library BFD. */ -static gdb_bfd_ref_ptr -spu_bfd_open (const char *pathname) -{ - const char *original_name = strrchr (pathname, '@'); - asection *spu_name; - unsigned long long addr; - int fd; - - /* Handle regular SVR4 libraries. */ - if (!original_name) - return svr4_so_ops.bfd_open (pathname); - - /* Decode object ID. */ - if (sscanf (original_name, "@0x%llx <%d>", &addr, &fd) != 2) - internal_error (__FILE__, __LINE__, "bad object ID"); - - /* Open BFD representing SPE executable. */ - gdb_bfd_ref_ptr abfd (spu_bfd_fopen (original_name, (CORE_ADDR) addr)); - if (abfd == NULL) - error (_("Cannot read SPE executable at %s"), original_name); - - /* Retrieve SPU name note. */ - spu_name = bfd_get_section_by_name (abfd.get (), ".note.spu_name"); - if (spu_name) - { - int sect_size = bfd_section_size (spu_name); - - if (sect_size > 20) - { - char *buf - = (char *) alloca (sect_size - 20 + strlen (original_name) + 1); - - bfd_get_section_contents (abfd.get (), spu_name, buf, 20, - sect_size - 20); - buf[sect_size - 20] = '\0'; - - strcat (buf, original_name); - - bfd_set_filename (abfd.get (), xstrdup (buf)); - } - } - - return abfd; -} - -/* Lookup global symbol in a SPE executable. */ -static struct block_symbol -spu_lookup_lib_symbol (struct objfile *objfile, - const char *name, - const domain_enum domain) -{ - if (bfd_get_arch (objfile->obfd) == bfd_arch_spu) - return lookup_global_symbol_from_objfile (objfile, GLOBAL_BLOCK, name, - domain); - - if (svr4_so_ops.lookup_lib_global_symbol != NULL) - return svr4_so_ops.lookup_lib_global_symbol (objfile, name, domain); - return {}; -} - -/* Enable shared library breakpoint. */ -static int -spu_enable_break (struct objfile *objfile) -{ - struct bound_minimal_symbol spe_event_sym; - - /* The libspe library will call __spe_context_update_event whenever any - SPE context is allocated or destroyed. */ - spe_event_sym = lookup_minimal_symbol ("__spe_context_update_event", - NULL, objfile); - - /* Place a solib_event breakpoint on the symbol. */ - if (spe_event_sym.minsym) - { - CORE_ADDR addr = BMSYMBOL_VALUE_ADDRESS (spe_event_sym); - - addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (), addr, - current_top_target ()); - create_solib_event_breakpoint (target_gdbarch (), addr); - return 1; - } - - return 0; -} - -/* Enable shared library breakpoint for the - OpenCL runtime running on the SPU. */ -static void -ocl_enable_break (struct objfile *objfile) -{ - struct bound_minimal_symbol event_sym; - struct bound_minimal_symbol addr_sym; - - /* The OpenCL runtime on the SPU will call __opencl_program_update_event - whenever an OpenCL program is loaded. */ - event_sym = lookup_minimal_symbol ("__opencl_program_update_event", NULL, - objfile); - /* The PPU address of the OpenCL program can be found - at opencl_elf_image_address. */ - addr_sym = lookup_minimal_symbol ("opencl_elf_image_address", NULL, objfile); - - if (event_sym.minsym && addr_sym.minsym) - { - /* Place a solib_event breakpoint on the symbol. */ - CORE_ADDR event_addr = BMSYMBOL_VALUE_ADDRESS (event_sym); - create_solib_event_breakpoint (get_objfile_arch (objfile), event_addr); - - /* Store the address of the symbol that will point to OpenCL program - using the per-objfile private data mechanism. */ - if (ocl_program_data_key.get (objfile) == NULL) - { - CORE_ADDR *ocl_program_addr_base = OBSTACK_CALLOC ( - &objfile->objfile_obstack, - objfile->sections_end - objfile->sections, - CORE_ADDR); - *ocl_program_addr_base = BMSYMBOL_VALUE_ADDRESS (addr_sym); - ocl_program_data_key.set (objfile, ocl_program_addr_base); - } - } -} - -/* Create inferior hook. */ -static void -spu_solib_create_inferior_hook (int from_tty) -{ - /* Handle SPE stand-alone executables. */ - if (spu_standalone_p ()) - { - /* After an SPE stand-alone executable was loaded, we'll receive - an additional trap due to the binfmt_misc handler. Make sure - to skip that trap. */ - spu_skip_standalone_loader (); - - /* If the user established breakpoints before starting the inferior, GDB - would attempt to insert those now. This would fail because the SPU - context has not yet been created and the SPU executable has not yet - been loaded. To prevent such failures, we disable all user-created - breakpoints now; they will be re-enabled in spu_current_sos once the - main SPU context has been detected. */ - disable_breakpoints_before_startup (); - - /* A special case arises when re-starting an executable, because at - this point it still resides at the relocated address range that was - determined during its last execution. We need to undo the relocation - so that that multi-architecture target recognizes the stand-alone - initialization special case. */ - spu_relocate_main_executable (-1); - } - - /* Call SVR4 hook -- this will re-insert the SVR4 solib breakpoints. */ - svr4_so_ops.solib_create_inferior_hook (from_tty); - - /* If the inferior is statically linked against libspe, we need to install - our own solib breakpoint right now. Otherwise, it will be installed by - the solib_loaded observer below as soon as libspe is loaded. */ - spu_enable_break (NULL); -} - -/* Install SPE "shared library" handling. This is called by -tdep code - that wants to support SPU as a secondary architecture. */ -void -set_spu_solib_ops (struct gdbarch *gdbarch) -{ - static struct target_so_ops spu_so_ops; - - /* Initialize this lazily, to avoid an initialization order - dependency on solib-svr4.c's _initialize routine. */ - if (spu_so_ops.current_sos == NULL) - { - spu_so_ops = svr4_so_ops; - spu_so_ops.solib_create_inferior_hook = spu_solib_create_inferior_hook; - spu_so_ops.relocate_section_addresses = spu_relocate_section_addresses; - spu_so_ops.free_so = spu_free_so; - spu_so_ops.current_sos = spu_current_sos; - spu_so_ops.bfd_open = spu_bfd_open; - spu_so_ops.lookup_lib_global_symbol = spu_lookup_lib_symbol; - } - - set_solib_ops (gdbarch, &spu_so_ops); -} - -/* Observer for the solib_loaded event. Used to install our breakpoint - if libspe is a shared library. */ -static void -spu_solib_loaded (struct so_list *so) -{ - if (strstr (so->so_original_name, "/libspe") != NULL) - { - solib_read_symbols (so, 0); - spu_enable_break (so->objfile); - } - /* In case the OpenCL runtime is loaded we install a breakpoint - to get notified whenever an OpenCL program gets loaded. */ - if (strstr (so->so_name, "CLRuntimeAccelCellSPU@") != NULL) - { - solib_read_symbols (so, 0); - ocl_enable_break (so->objfile); - } -} - -void -_initialize_spu_solib (void) -{ - gdb::observers::solib_loaded.attach (spu_solib_loaded); -} - |