From 405f8e949968faadc137cf5d4244fc68a7f6c586 Mon Sep 17 00:00:00 2001 From: Stan Shebs Date: Mon, 14 Nov 2011 20:07:25 +0000 Subject: 2011-11-14 Stan Shebs Kwok Cheung Yeung * NEWS: Document shorter fast tracepoints and qTMinFTPILen packet. * i386-tdep.c (i386_fast_tracepoint_valid_at): Query target for the minimum instruction size for fast tracepoints. * target.h (struct target_ops): Add new method to_get_min_fast_tracepoint_insn_len. (target_get_min_fast_tracepoint_insn_len): New. * target.c (update_current_target): Set up new target operation. * remote.c (remote_write_bytes_aux): Fix typo. (remote_get_min_fast_tracepoint_insn_len): New. (init_remote_ops): Initialize new field. * gdb.texinfo (Create and Delete Tracepoints): Describe what is needed to get shorter fast tracepoints. (Tracepoint Packets): Document new qTMinFTPILen packet. * linux-x86-low.c (small_jump_insn): New. (i386_install_fast_tracepoint_jump_pad): Add arguments for trampoline and error message, build a trampoline and issue a small jump instruction to it. (x86_install_fast_tracepoint_jump_pad): Add arguments for trampoline and error message. (x86_get_min_fast_tracepoint_insn_len): New. (the_low_target): Add call to x86_get_min_fast_tracepoint_insn_len. * linux-low.h (struct linux_target_ops): Add arguments to install_fast_tracepoint_jump_pad operation, add new operation. * linux-low.c (linux_install_fast_tracepoint_jump_pad): Add arguments. (linux_get_min_fast_tracepoint_insn_len): New function. (linux_target_op): Add new operation. * tracepoint.c (gdb_trampoline_buffer): New IPA variable. (gdb_trampoline_buffer_end): Ditto. (gdb_trampoline_buffer_error): Ditto. (struct ipa_sym_addresses): Add fields for new IPA variables. (symbol_list): Add entries for new IPA variables. (struct tracepoint): Add fields to hold the address range of the trampoline used by the tracepoint. (trampoline_buffer_head): New static variable. (trampoline_buffer_tail): Ditto. (claim_trampoline_space): New function. (have_fast_tracepoint_trampoline_buffer): New function. (clone_fast_tracepoint): Fill in trampoline fields of tracepoint structure. (install_fast_tracepoint): Ditto, also add error buffer argument. (cmd_qtminftpilen): New function. (handle_tracepoint_query): Add response to qTMinFTPILen packet. (fast_tracepoint_from_trampoline_address): New function. (fast_tracepoint_collecting): Handle trampoline as part of jump pad space. (set_trampoline_buffer_space): New function. (initialize_tracepoint): Initialize new IPA variables. * target.h (struct target_ops): Add arguments to install_fast_tracepoint_jump_pad operation, add new get_min_fast_tracepoint_insn_len operation. (target_get_min_fast_tracepoint_insn_len): New. (install_fast_tracepoint_jump_pad): Add arguments. * server.h (IPA_BUFSIZ): Define. * linux-i386-ipa.c: Include extra header files. (initialize_fast_tracepoint_trampoline_buffer): New function. (initialize_low_tracepoint): Call it. * server.h (set_trampoline_buffer_space): Declare. (claim_trampoline_space): Ditto. (have_fast_tracepoint_trampoline_buffer): Ditto. * gdb.trace/ftrace.c: New. * gdb.trace/ftrace.exp: New. --- gdb/gdbserver/linux-low.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'gdb/gdbserver/linux-low.h') diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h index 6635bc6..a4e3d5a 100644 --- a/gdb/gdbserver/linux-low.h +++ b/gdb/gdbserver/linux-low.h @@ -132,14 +132,22 @@ struct linux_target_ops CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry, + CORE_ADDR *trampoline, + ULONGEST *trampoline_size, unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size, CORE_ADDR *adjusted_insn_addr, - CORE_ADDR *adjusted_insn_addr_end); + CORE_ADDR *adjusted_insn_addr_end, + char *err); /* Return the bytecode operations vector for the current inferior. Returns NULL if bytecode compilation is not supported. */ struct emit_ops *(*emit_ops) (void); + + /* Return the minimum length of an instruction that can be safely overwritten + for use as a fast tracepoint. */ + int (*get_min_fast_tracepoint_insn_len) (void); + }; extern struct linux_target_ops the_low_target; -- cgit v1.1