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2011-11-14 Stan Shebs <stan@codesourcery.com>

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Kwok Cheung Yeung  <kcy@codesourcery.com>

	* 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.
This commit is contained in:
Stan Shebs
2011-11-14 20:07:25 +00:00
parent 3e05895e9e
commit 405f8e9499
19 changed files with 882 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
gdb/gdbserver/target.h
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@@ -359,20 +359,26 @@ struct target_ops
pad lock object. ORIG_SIZE is the size in bytes of the
instruction at TPADDR. JUMP_ENTRY points to the address of the
jump pad entry, and on return holds the address past the end of
the created jump pad. JJUMP_PAD_INSN is a buffer containing a
copy of the instruction at TPADDR. ADJUST_INSN_ADDR and
ADJUST_INSN_ADDR_END are output parameters that return the
address range where the instruction at TPADDR was relocated
to. */
the created jump pad. If a trampoline is created by the function,
then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
the trampoline, else they remain unchanged. JJUMP_PAD_INSN is a
buffer containing a copy of the instruction at TPADDR.
ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
return the address range where the instruction at TPADDR was relocated
to. If an error occurs, the ERR may be used to pass on an error
message. */
int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
CORE_ADDR collector,
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. */
@@ -380,6 +386,10 @@ struct target_ops
/* Returns true if the target supports disabling randomization. */
int (*supports_disable_randomization) (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 target_ops *the_target;
@@ -437,6 +447,10 @@ void set_target_ops (struct target_ops *);
#define target_supports_fast_tracepoints() \
(the_target->install_fast_tracepoint_jump_pad != NULL)
#define target_get_min_fast_tracepoint_insn_len() \
(the_target->get_min_fast_tracepoint_insn_len \
? (*the_target->get_min_fast_tracepoint_insn_len) () : 0)
#define thread_stopped(thread) \
(*the_target->thread_stopped) (thread)
@@ -471,17 +485,23 @@ void set_target_ops (struct target_ops *);
#define install_fast_tracepoint_jump_pad(tpoint, tpaddr, \
collector, lockaddr, \
orig_size, \
jump_entry, jjump_pad_insn, \
jump_entry, \
trampoline, trampoline_size, \
jjump_pad_insn, \
jjump_pad_insn_size, \
adjusted_insn_addr, \
adjusted_insn_addr_end) \
adjusted_insn_addr_end, \
err) \
(*the_target->install_fast_tracepoint_jump_pad) (tpoint, tpaddr, \
collector,lockaddr, \
orig_size, jump_entry, \
trampoline, \
trampoline_size, \
jjump_pad_insn, \
jjump_pad_insn_size, \
adjusted_insn_addr, \
adjusted_insn_addr_end)
adjusted_insn_addr_end, \
err)
#define target_emit_ops() \
(the_target->emit_ops ? (*the_target->emit_ops) () : NULL)