mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
5af949e350
(paddress): Add GDBARCH parameter. * utils.c (strlen_paddr, paddr, paddr_nz): Remove. (paddress): Add GDBARCH parameter, use it instead of current_gdbarch. * ui-out.h (ui_out_field_core_addr): Add GDBARCH parameter. * ui-out.c (ui_out_field_core_addr): Add GDBARCH parameter, use it instead of current_gdbarch. Update calls to ui_out_field_core_addr to pass architecture: * ada-lang.c (print_one_exception): Update. * breakpoint.c (print_one_breakpoint_location, print_one_exception_catchpoint): Update. * disasm.c (dump_insns): Update. * darwin-nat-info.c (darwin_debug_regions_recurse): Update. * mi/mi-main.c (mi_cmd_data_read_memory): Update. * mi/mi-symbol-cmds.c: Include "objfiles.h". (mi_cmd_symbol_list_lines): Update. * stack.c (print_frame_info, print_frame): Update. Update callers of paddress to pass architecture: * ada-tasks.c (info_task): Update. * ada-valprint.c (ada_val_print_1): Update. * annotate.c (annotate_source, annotate_frame_begin): Update. * breakpoint.c (insert_bp_location, describe_other_breakpoints, mention): Update. * cli/cli-cmds.c (edit_command, list_command, print_disassembly): Update. * corefile.c (memory_error): Update. * c-valprint.c (print_function_pointer_address, c_val_print): Update. * disasm.c (dis_asm_print_address): Update. * exec.c (print_section_info): Update. * f-valprint.c (f_val_print): Update. * infcmd.c: Include "arch-utils.h". (jump_command, program_info): Update. * linux-fork.c: Include "arch-utils.h". (info_forks_command): Update. * m2-valprint.c (print_function_pointer_address, print_unpacked_pointer, print_variable_at_address, m2_val_print): Update. * m32r-rom.c (m32r_load_section, m32r_load, m32r_upload_command): Update. * printcmd.c (print_address, print_address_demangle, address_info): Update. * p-valprint.c (pascal_val_print): Update. * source.c: Include "arch-utils.h". (line_info): Update. * stack.c (frame_info, print_block_frame_labels): Update. * symfile.c (add_symbol_file_command, list_overlays_command): Update. * symmisc.c (dump_msymbols, dump_psymtab, dump_symtab_1, print_symbol, print_partial_symbols, maintenance_info_psymtabs, maintenance_check_symtabs): Update. * symtab.c (find_pc_sect_symtab): Update. * target.c (deprecated_debug_xfer_memory): Update. * tracepoint.c (scope_info): Update. * tui/tui-stack.c (tui_make_status_line): Update. * valprint.c (val_print_string): Update. Update callers of paddr_nz to use paddress instead (keeping user-visible output identical): * alpha-tdep.c (alpha_heuristic_proc_start): Update. * amd64-tdep.c (fixup_riprel, amd64_displaced_step_copy_insn, amd64_displaced_step_fixup): Update. * arch-utils.c (simple_displaced_step_copy_insn): Update. * auxv.c (fprint_target_auxv): Update. * breakpoint.c (insert_single_step_breakpoint): Update. * buildsym.c (finish_block): Update. * cli/cli-dump.c (restore_section_callback): Update. * fbsd-nat.c (fbsd_find_memory_regions): Update. * frame.c (frame_unwind_register_value): Update. * gcore.c (gcore_create_callback): Update. * hppa-tdep.c (hppa_frame_cache, hppa_skip_trampoline_code): Update. * i386-tdep.c (i386_displaced_step_fixup, i386_record_modrm, i386_record_lea_modrm_addr, i386_record_lea_modrm, i386_process_record): Update. * ia64-tdep.c (ia64_frame_this_id, ia64_sigtramp_frame_this_id, ia64_libunwind_frame_this_id, ia64_libunwind_sigtramp_frame_this_id, ia64_dummy_id, ia64_access_reg, ia64_access_rse_reg): Update. * infrun.c (displaced_step_prepare, displaced_step_fixup, handle_inferior_event, insert_step_resume_breakpoint_at_sal, insert_longjmp_resume_breakpoint): Update. * linux-nat.c (linux_nat_find_memory_regions): Update. * linux-record.c (record_linux_system_call): Update. * mips-tdep.c (heuristic_proc_start, mips_eabi_push_dummy_call, mips_n32n64_push_dummy_call, mips_o32_push_dummy_call, mips_o64_push_dummy_call): Update. * monitor.c (monitor_error, monitor_remove_breakpoint): Update. * record.c (record_arch_list_add_mem, record_wait, record_xfer_partial): Update. * remote-mips.c (mips_fetch_word, mips_check_lsi_error, mips_common_breakpoint): Update. * remote-sim.c (gdbsim_xfer_inferior_memory): Update. * rs6000-tdep.c (ppc_displaced_step_fixup): Update. * solib-som.c (som_current_sos): Update. * symfile.c (load_progress, generic_load): Update. * symfile-mem.c (add_vsyscall_page): Update. * valops.c (value_fetch_lazy): Update. * windows-tdep.c (windows_xfer_shared_library): Update. Update callers of paddr_nz to use paddress instead (changing user-visible output to make it more correct): * dwarf2loc.c (locexpr_describe_location): Update. * ia64-tdep.c (ia64_memory_insert_breakpoint, ia64_memory_remove_breakpoint): Update. * jv-valprint.c (java_value_print): Update. * m32c-tdep.c (m32c_m16c_address_to_pointer): Update. * monitor.c (monitor_read_memory): Update. Update callers of paddr to use paddress instead (changing user-visible output to make it more correct): * arm-tdep.c (arm_push_dummy_call): Update. * breakpoint.c (insert_bp_location, create_thread_event_breakpoint, create_breakpoint): Update. * darwin-nat-info.c (darwin_debug_regions): Update. * dcache.c (dcache_info): Update. * dsrec.c (load_srec, make_srec): Update. * dwarf2-frame.c (dwarf2_restore_rule, execute_cfa_program, dwarf2_frame_cache): Update. * gcore.c (gcore_copy_callback): Update. * gnu-nat.c (gnu_xfer_memory): Update. * mips-linux-nat.c (mips_show_dr): Update. * monitor.c (monitor_write_memory, monitor_insert_breakpoint, monitor_remove_breakpoint): Update. * remote.c (compare_sections_command): Update. * remote-m32r-sdi.c (m32r_xfer_memory, m32r_insert_breakpoint, m32r_remove_breakpoint, m32r_insert_watchpoint, m32r_remove_watchpoint): Update. * sol-thread.c (info_cb): Update. * symfile.c (load_progress): Update. Update callers of paddress or paddr_nz to use hex_string instead (changes output of internal/error/debug messages only): * dwarf2read.c (dump_die_shallow): Update. * frame.c (fprint_field, fprint_frame, frame_pc_unwind, get_frame_func, create_new_frame): Update. * hppa-tdep.c (find_unwind_entry, unwind_command): Update. * ia64-tdep.c (get_kernel_table, ia64_find_proc_info_x, ia64_get_dyn_info_list): Update. * maint.c (maintenance_translate_address): Update. * mi/mi-cmd-var.c (mi_cmd_var_create): Update. * target.c (target_flash_erase): Update. Update callers of paddr/paddr_nz to use phex/phex_nz instead, using an appropriate address size. Remove use of strlen_paddr. * exec.c (exec_files_info): Update. * i386-nat.c (i386_show_dr): Update. * remote.c (remote_flash_erase): Update. * m32r-rom.c (m32r_load_section): Update. * monitor.c (monitor_vsprintf, monitor_store_register): Update. * remote.c (remote_check_symbols, remote_search_memory): Update. * remote-mips.c (mips_request, mips_common_breakpoint): Update. * scm-valprint.c (scm_ipruk, scm_scmval_print): Update. * sh64-tdep.c (sh64_show_media_regs, sh64_show_compact_regs): Update. * sh-tdep.c (sh_generic_show_regs, sh3_show_regs, sh2e_show_regs, sh2a_show_regs, sh2a_nofpu_show_regs, sh3e_show_regs, sh3_dsp_show_regs, sh4_show_regs, sh4_nofpu_show_regs, sh_dsp_show_regs): Update. * xcoffsolib.c (sharedlibrary_command): Update. * maint.c (maint_print_section_info): Add ADDR_SIZE parameter. Use hex_string_custom instead of paddr. (print_bfd_section_info): Pass address size. (print_objfile_section_info): Likewise. * annotate.h (annotate_source): Add GDBARCH parameter. (annotate_frame_begin): Likewise. * annotate.c (annotate_source): Add GDBARCH parameter. (annotate_frame_begin): Likewise. * source.c (identify_source_line): Update call to annotate_source. * stack.c (print_frame_info, print_frame): Update call to annotate_frame_begin. * breakpoint.c (describe_other_breakpoints): Add GDBARCH parameter. (create_breakpoint, create_ada_exception_breakpoint): Update call. * stack.c (print_block_frame_labels): Add GDBARCH parameter. (print_frame_label_vars): Update call. * symmisc.c (print_partial_symbols): Add GDBARCH parameter. (dump_psymtab): Update call to print_partial_symbols. (struct print_symbol_args): Add GDBARCH member. (dump_symtab_1): Set print_symbol_args architecture member. (print_symbol): Use it. * windows-tdep.h (windows_xfer_shared_library): Add GDBARCH parameter. * windows-tdep.c (windows_xfer_shared_library): Likewise. * i386-cygwin-tdep.c (struct cpms_data): Add GDBARCH member. (core_process_module_section): Pass architecture from cpms_data to windows_xfer_shared_library. (windows_core_xfer_shared_libraries): Initialize cmps_data architecture member. * windows-nat.c (windows_xfer_shared_libraries): Pass architecture to windows_xfer_shared_library. * defs.h (print_address): Add GDBARCH parameter. * printcmd.c (print_address): Add GDBARCH parameter. (print_scalar_formatted, do_examine): Update call. * findcmd.c (find_command): Update call. * tracepoint.c: Include "arch-utils.h". (trace_find_line_command): Update call. * tui/tui-disasm.c (tui_disassemble): Update call. * value.h (print_address_demangle): Add GDBARCH parameter. * printcmd.c (print_address_demangle): Add GDBARCH parameter. * c-valprint.c (print_function_pointer_address, c_val_print): Update call. * f-valprint.c (f_val_print): Update call. * gnu-v3-abi.c (gnuv3_print_method_ptr): Update call. * jv-valprint.c (java_val_print): Update call. * m2-valprint.c (print_function_pointer_address, m2_val_print): Update call. * p-valprint.c (pascal_val_print): Update call. * disasm.c (gdb_disassemble_info): Install architecture into di.application_data field. testsuite/ChangeLog: * gdb.threads/tls-shared.exp: Update to locexpr_describe_location change to prefix TLS offset in hex with 0x. doc/ChangeLog: * gdbint.texinfo (Item Output Functions): Update signature for ui_out_field_core_addr.
609 lines
16 KiB
C
609 lines
16 KiB
C
/* Caching code for GDB, the GNU debugger.
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Copyright (C) 1992, 1993, 1995, 1996, 1998, 1999, 2000, 2001, 2003, 2007,
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2008, 2009 Free Software Foundation, Inc.
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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 "dcache.h"
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#include "gdbcmd.h"
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#include "gdb_string.h"
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#include "gdbcore.h"
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#include "target.h"
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/* The data cache could lead to incorrect results because it doesn't
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know about volatile variables, thus making it impossible to debug
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functions which use memory mapped I/O devices. Set the nocache
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memory region attribute in those cases.
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In general the dcache speeds up performance, some speed improvement
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comes from the actual caching mechanism, but the major gain is in
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the reduction of the remote protocol overhead; instead of reading
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or writing a large area of memory in 4 byte requests, the cache
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bundles up the requests into 32 byte (actually LINE_SIZE) chunks.
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Reducing the overhead to an eighth of what it was. This is very
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obvious when displaying a large amount of data,
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eg, x/200x 0
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caching | no yes
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----------------------------
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first time | 4 sec 2 sec improvement due to chunking
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second time | 4 sec 0 sec improvement due to caching
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The cache structure is unusual, we keep a number of cache blocks
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(DCACHE_SIZE) and each one caches a LINE_SIZEed area of memory.
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Within each line we remember the address of the line (always a
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multiple of the LINE_SIZE) and a vector of bytes over the range.
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There's another vector which contains the state of the bytes.
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ENTRY_INVALID means that the byte is just plain wrong, and has no
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correspondence with anything else (as it would when the cache is
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turned on, but nothing has been done to it).
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ENTRY_DIRTY means that the byte has some data in it which should be
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written out to the remote target one day, but contains correct
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data.
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ENTRY_VALID means that the data is the same in the cache as it is in
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remote memory.
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The ENTRY_DIRTY state is necessary because GDB likes to write large
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lumps of memory in small bits. If the caching mechanism didn't
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maintain the DIRTY information, then something like a two byte
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write would mean that the entire cache line would have to be read,
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the two bytes modified and then written out again. The alternative
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would be to not read in the cache line in the first place, and just
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write the two bytes directly into target memory. The trouble with
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that is that it really nails performance, because of the remote
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protocol overhead. This way, all those little writes are bundled
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up into an entire cache line write in one go, without having to
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read the cache line in the first place.
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*/
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/* NOTE: Interaction of dcache and memory region attributes
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As there is no requirement that memory region attributes be aligned
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to or be a multiple of the dcache page size, dcache_read_line() and
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dcache_write_line() must break up the page by memory region. If a
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chunk does not have the cache attribute set, an invalid memory type
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is set, etc., then the chunk is skipped. Those chunks are handled
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in target_xfer_memory() (or target_xfer_memory_partial()).
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This doesn't occur very often. The most common occurance is when
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the last bit of the .text segment and the first bit of the .data
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segment fall within the same dcache page with a ro/cacheable memory
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region defined for the .text segment and a rw/non-cacheable memory
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region defined for the .data segment. */
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/* This value regulates the number of cache blocks stored.
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Smaller values reduce the time spent searching for a cache
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line, and reduce memory requirements, but increase the risk
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of a line not being in memory */
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#define DCACHE_SIZE 64
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/* This value regulates the size of a cache line. Smaller values
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reduce the time taken to read a single byte, but reduce overall
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throughput. */
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#define LINE_SIZE_POWER (5)
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#define LINE_SIZE (1 << LINE_SIZE_POWER)
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/* Each cache block holds LINE_SIZE bytes of data
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starting at a multiple-of-LINE_SIZE address. */
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#define LINE_SIZE_MASK ((LINE_SIZE - 1))
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#define XFORM(x) ((x) & LINE_SIZE_MASK)
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#define MASK(x) ((x) & ~LINE_SIZE_MASK)
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#define ENTRY_INVALID 0 /* data at this byte is wrong */
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#define ENTRY_DIRTY 1 /* data at this byte needs to be written back */
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#define ENTRY_VALID 2 /* data at this byte is same as in memory */
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/* For cache state display by "info dcache".
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The letters I,D,V map to
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I = ENTRY_INVALID
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D = ENTRY_DIRTY
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V = ENTRY_VALID */
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static const char state_chars[3] = { 'I', 'D', 'V' };
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struct dcache_block
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{
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struct dcache_block *p; /* next in list */
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CORE_ADDR addr; /* Address for which data is recorded. */
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gdb_byte data[LINE_SIZE]; /* bytes at given address */
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unsigned char state[LINE_SIZE]; /* what state the data is in */
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/* whether anything in state is dirty - used to speed up the
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dirty scan. */
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int anydirty;
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int refs;
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};
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/* FIXME: dcache_struct used to have a cache_has_stuff field that was
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used to record whether the cache had been accessed. This was used
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to invalidate the cache whenever caching was (re-)enabled (if the
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cache was disabled and later re-enabled, it could contain stale
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data). This was not needed because the cache is write through and
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the code that enables, disables, and deletes memory region all
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invalidate the cache.
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This is overkill, since it also invalidates cache lines from
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unrelated regions. One way this could be addressed by adding a
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new function that takes an address and a length and invalidates
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only those cache lines that match. */
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struct dcache_struct
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{
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/* free list */
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struct dcache_block *free_head;
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struct dcache_block *free_tail;
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/* in use list */
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struct dcache_block *valid_head;
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struct dcache_block *valid_tail;
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/* The cache itself. */
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struct dcache_block *the_cache;
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};
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static struct dcache_block *dcache_hit (DCACHE *dcache, CORE_ADDR addr);
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static int dcache_write_line (DCACHE *dcache, struct dcache_block *db);
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static int dcache_read_line (DCACHE *dcache, struct dcache_block *db);
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static struct dcache_block *dcache_alloc (DCACHE *dcache, CORE_ADDR addr);
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static int dcache_writeback (DCACHE *dcache);
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static void dcache_info (char *exp, int tty);
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void _initialize_dcache (void);
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static int dcache_enabled_p = 0;
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static void
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show_dcache_enabled_p (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("Cache use for remote targets is %s.\n"), value);
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}
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DCACHE *last_cache; /* Used by info dcache */
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/* Free all the data cache blocks, thus discarding all cached data. */
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void
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dcache_invalidate (DCACHE *dcache)
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{
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int i;
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dcache->valid_head = 0;
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dcache->valid_tail = 0;
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dcache->free_head = 0;
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dcache->free_tail = 0;
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for (i = 0; i < DCACHE_SIZE; i++)
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{
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struct dcache_block *db = dcache->the_cache + i;
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if (!dcache->free_head)
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dcache->free_head = db;
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else
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dcache->free_tail->p = db;
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dcache->free_tail = db;
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db->p = 0;
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}
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return;
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}
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/* If addr is present in the dcache, return the address of the block
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containing it. */
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static struct dcache_block *
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dcache_hit (DCACHE *dcache, CORE_ADDR addr)
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{
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struct dcache_block *db;
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/* Search all cache blocks for one that is at this address. */
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db = dcache->valid_head;
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while (db)
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{
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if (MASK (addr) == db->addr)
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{
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db->refs++;
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return db;
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}
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db = db->p;
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}
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return NULL;
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}
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/* Make sure that anything in this line which needs to
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be written is. */
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static int
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dcache_write_line (DCACHE *dcache, struct dcache_block *db)
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{
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CORE_ADDR memaddr;
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gdb_byte *myaddr;
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int len;
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int res;
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int reg_len;
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struct mem_region *region;
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if (!db->anydirty)
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return 1;
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len = LINE_SIZE;
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memaddr = db->addr;
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myaddr = db->data;
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while (len > 0)
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{
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int s;
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int e;
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int dirty_len;
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region = lookup_mem_region(memaddr);
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if (memaddr + len < region->hi)
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reg_len = len;
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else
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reg_len = region->hi - memaddr;
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if (!region->attrib.cache || region->attrib.mode == MEM_RO)
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{
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memaddr += reg_len;
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myaddr += reg_len;
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len -= reg_len;
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continue;
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}
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while (reg_len > 0)
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{
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s = XFORM(memaddr);
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while (reg_len > 0) {
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if (db->state[s] == ENTRY_DIRTY)
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break;
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s++;
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reg_len--;
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memaddr++;
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myaddr++;
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len--;
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}
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e = s;
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while (reg_len > 0) {
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if (db->state[e] != ENTRY_DIRTY)
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break;
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e++;
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reg_len--;
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}
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dirty_len = e - s;
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res = target_write (¤t_target, TARGET_OBJECT_RAW_MEMORY,
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NULL, myaddr, memaddr, dirty_len);
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if (res < dirty_len)
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return 0;
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memset (&db->state[XFORM(memaddr)], ENTRY_VALID, res);
|
|
memaddr += res;
|
|
myaddr += res;
|
|
len -= res;
|
|
}
|
|
}
|
|
|
|
db->anydirty = 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Read cache line */
|
|
static int
|
|
dcache_read_line (DCACHE *dcache, struct dcache_block *db)
|
|
{
|
|
CORE_ADDR memaddr;
|
|
gdb_byte *myaddr;
|
|
int len;
|
|
int res;
|
|
int reg_len;
|
|
struct mem_region *region;
|
|
|
|
/* If there are any dirty bytes in the line, it must be written
|
|
before a new line can be read */
|
|
if (db->anydirty)
|
|
{
|
|
if (!dcache_write_line (dcache, db))
|
|
return 0;
|
|
}
|
|
|
|
len = LINE_SIZE;
|
|
memaddr = db->addr;
|
|
myaddr = db->data;
|
|
|
|
while (len > 0)
|
|
{
|
|
region = lookup_mem_region(memaddr);
|
|
if (memaddr + len < region->hi)
|
|
reg_len = len;
|
|
else
|
|
reg_len = region->hi - memaddr;
|
|
|
|
if (!region->attrib.cache || region->attrib.mode == MEM_WO)
|
|
{
|
|
memaddr += reg_len;
|
|
myaddr += reg_len;
|
|
len -= reg_len;
|
|
continue;
|
|
}
|
|
|
|
res = target_read (¤t_target, TARGET_OBJECT_RAW_MEMORY,
|
|
NULL, myaddr, memaddr, reg_len);
|
|
if (res < reg_len)
|
|
return 0;
|
|
|
|
memaddr += res;
|
|
myaddr += res;
|
|
len -= res;
|
|
}
|
|
|
|
memset (db->state, ENTRY_VALID, sizeof (db->data));
|
|
db->anydirty = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Get a free cache block, put or keep it on the valid list,
|
|
and return its address. */
|
|
|
|
static struct dcache_block *
|
|
dcache_alloc (DCACHE *dcache, CORE_ADDR addr)
|
|
{
|
|
struct dcache_block *db;
|
|
|
|
/* Take something from the free list */
|
|
db = dcache->free_head;
|
|
if (db)
|
|
{
|
|
dcache->free_head = db->p;
|
|
}
|
|
else
|
|
{
|
|
/* Nothing left on free list, so grab one from the valid list */
|
|
db = dcache->valid_head;
|
|
|
|
if (!dcache_write_line (dcache, db))
|
|
return NULL;
|
|
|
|
dcache->valid_head = db->p;
|
|
}
|
|
|
|
db->addr = MASK(addr);
|
|
db->refs = 0;
|
|
db->anydirty = 0;
|
|
memset (db->state, ENTRY_INVALID, sizeof (db->data));
|
|
|
|
/* append this line to end of valid list */
|
|
if (!dcache->valid_head)
|
|
dcache->valid_head = db;
|
|
else
|
|
dcache->valid_tail->p = db;
|
|
dcache->valid_tail = db;
|
|
db->p = 0;
|
|
|
|
return db;
|
|
}
|
|
|
|
/* Writeback any dirty lines. */
|
|
static int
|
|
dcache_writeback (DCACHE *dcache)
|
|
{
|
|
struct dcache_block *db;
|
|
|
|
db = dcache->valid_head;
|
|
|
|
while (db)
|
|
{
|
|
if (!dcache_write_line (dcache, db))
|
|
return 0;
|
|
db = db->p;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Using the data cache DCACHE return the contents of the byte at
|
|
address ADDR in the remote machine.
|
|
|
|
Returns 0 on error. */
|
|
|
|
static int
|
|
dcache_peek_byte (DCACHE *dcache, CORE_ADDR addr, gdb_byte *ptr)
|
|
{
|
|
struct dcache_block *db = dcache_hit (dcache, addr);
|
|
|
|
if (!db)
|
|
{
|
|
db = dcache_alloc (dcache, addr);
|
|
if (!db)
|
|
return 0;
|
|
}
|
|
|
|
if (db->state[XFORM (addr)] == ENTRY_INVALID)
|
|
{
|
|
if (!dcache_read_line(dcache, db))
|
|
return 0;
|
|
}
|
|
|
|
*ptr = db->data[XFORM (addr)];
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Write the byte at PTR into ADDR in the data cache.
|
|
Return zero on write error.
|
|
*/
|
|
|
|
static int
|
|
dcache_poke_byte (DCACHE *dcache, CORE_ADDR addr, gdb_byte *ptr)
|
|
{
|
|
struct dcache_block *db = dcache_hit (dcache, addr);
|
|
|
|
if (!db)
|
|
{
|
|
db = dcache_alloc (dcache, addr);
|
|
if (!db)
|
|
return 0;
|
|
}
|
|
|
|
db->data[XFORM (addr)] = *ptr;
|
|
db->state[XFORM (addr)] = ENTRY_DIRTY;
|
|
db->anydirty = 1;
|
|
return 1;
|
|
}
|
|
|
|
/* Initialize the data cache. */
|
|
DCACHE *
|
|
dcache_init (void)
|
|
{
|
|
int csize = sizeof (struct dcache_block) * DCACHE_SIZE;
|
|
DCACHE *dcache;
|
|
|
|
dcache = (DCACHE *) xmalloc (sizeof (*dcache));
|
|
|
|
dcache->the_cache = (struct dcache_block *) xmalloc (csize);
|
|
memset (dcache->the_cache, 0, csize);
|
|
|
|
dcache_invalidate (dcache);
|
|
|
|
last_cache = dcache;
|
|
return dcache;
|
|
}
|
|
|
|
/* Free a data cache */
|
|
void
|
|
dcache_free (DCACHE *dcache)
|
|
{
|
|
if (last_cache == dcache)
|
|
last_cache = NULL;
|
|
|
|
xfree (dcache->the_cache);
|
|
xfree (dcache);
|
|
}
|
|
|
|
/* Read or write LEN bytes from inferior memory at MEMADDR, transferring
|
|
to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is
|
|
nonzero.
|
|
|
|
Returns length of data written or read; 0 for error.
|
|
|
|
This routine is indended to be called by remote_xfer_ functions. */
|
|
|
|
int
|
|
dcache_xfer_memory (DCACHE *dcache, CORE_ADDR memaddr, gdb_byte *myaddr,
|
|
int len, int should_write)
|
|
{
|
|
int i;
|
|
int (*xfunc) (DCACHE *dcache, CORE_ADDR addr, gdb_byte *ptr);
|
|
xfunc = should_write ? dcache_poke_byte : dcache_peek_byte;
|
|
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
if (!xfunc (dcache, memaddr + i, myaddr + i))
|
|
return 0;
|
|
}
|
|
|
|
/* FIXME: There may be some benefit from moving the cache writeback
|
|
to a higher layer, as it could occur after a sequence of smaller
|
|
writes have been completed (as when a stack frame is constructed
|
|
for an inferior function call). Note that only moving it up one
|
|
level to target_xfer_memory() (also target_xfer_memory_partial())
|
|
is not sufficent, since we want to coalesce memory transfers that
|
|
are "logically" connected but not actually a single call to one
|
|
of the memory transfer functions. */
|
|
|
|
if (should_write)
|
|
dcache_writeback (dcache);
|
|
|
|
return len;
|
|
}
|
|
|
|
static void
|
|
dcache_info (char *exp, int tty)
|
|
{
|
|
struct dcache_block *p;
|
|
|
|
printf_filtered (_("Dcache line width %d, depth %d\n"),
|
|
LINE_SIZE, DCACHE_SIZE);
|
|
|
|
if (last_cache)
|
|
{
|
|
printf_filtered (_("Cache state:\n"));
|
|
|
|
for (p = last_cache->valid_head; p; p = p->p)
|
|
{
|
|
int j;
|
|
printf_filtered (_("Line at %s, referenced %d times\n"),
|
|
paddress (target_gdbarch, p->addr), p->refs);
|
|
|
|
for (j = 0; j < LINE_SIZE; j++)
|
|
printf_filtered ("%02x", p->data[j] & 0xFF);
|
|
printf_filtered (("\n"));
|
|
|
|
for (j = 0; j < LINE_SIZE; j++)
|
|
printf_filtered (" %c", state_chars[p->state[j]]);
|
|
printf_filtered ("\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
_initialize_dcache (void)
|
|
{
|
|
add_setshow_boolean_cmd ("remotecache", class_support,
|
|
&dcache_enabled_p, _("\
|
|
Set cache use for remote targets."), _("\
|
|
Show cache use for remote targets."), _("\
|
|
When on, use data caching for remote targets. For many remote targets\n\
|
|
this option can offer better throughput for reading target memory.\n\
|
|
Unfortunately, gdb does not currently know anything about volatile\n\
|
|
registers and thus data caching will produce incorrect results with\n\
|
|
volatile registers are in use. By default, this option is off."),
|
|
NULL,
|
|
show_dcache_enabled_p,
|
|
&setlist, &showlist);
|
|
|
|
add_info ("dcache", dcache_info,
|
|
_("\
|
|
Print information on the dcache performance.\n\
|
|
The state of each cached byte is represented by a letter:\n\
|
|
I = invalid\n\
|
|
D = dirty\n\
|
|
V = valid"));
|
|
}
|