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

Browse Source 
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

115
gdb/gdbserver/linux-x86-low.c
View File

@ -42,6 +42,7 @@ void init_registers_amd64_avx_linux (void);
void init_registers_i386_mmx_linux (void);
static unsigned char jump_insn[] = { 0xe9, 0, 0, 0, 0 };
static unsigned char small_jump_insn[] = { 0x66, 0xe9, 0, 0 };
/* Backward compatibility for gdb without XML support. */
@ -1182,10 +1183,13 @@ amd64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
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)
{
unsigned char buf[40];
int i, offset;
@ -1346,10 +1350,13 @@ i386_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
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)
{
unsigned char buf[0x100];
int i, offset;
@ -1455,7 +1462,7 @@ i386_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
buf[i++] = 0x0f; /* pop %fs */
buf[i++] = 0xa1;
buf[i++] = 0x07; /* pop %es */
buf[i++] = 0x1f; /* pop %de */
buf[i++] = 0x1f; /* pop %ds */
buf[i++] = 0x9d; /* popf */
buf[i++] = 0x83; /* add $0x4,%esp (pop of tpaddr aka $pc) */
buf[i++] = 0xc4;
@ -1479,11 +1486,40 @@ i386_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
is always done last (by our caller actually), so that we can
install fast tracepoints with threads running. This relies on
the agent's atomic write support. */
offset = *jump_entry - (tpaddr + sizeof (jump_insn));
memcpy (buf, jump_insn, sizeof (jump_insn));
memcpy (buf + 1, &offset, 4);
memcpy (jjump_pad_insn, buf, sizeof (jump_insn));
*jjump_pad_insn_size = sizeof (jump_insn);
if (orig_size == 4)
{
/* Create a trampoline. */
*trampoline_size = sizeof (jump_insn);
if (!claim_trampoline_space (*trampoline_size, trampoline))
{
/* No trampoline space available. */
strcpy (err,
"E.Cannot allocate trampoline space needed for fast "
"tracepoints on 4-byte instructions.");
return 1;
}
offset = *jump_entry - (*trampoline + sizeof (jump_insn));
memcpy (buf, jump_insn, sizeof (jump_insn));
memcpy (buf + 1, &offset, 4);
write_inferior_memory (*trampoline, buf, sizeof (jump_insn));
/* Use a 16-bit relative jump instruction to jump to the trampoline. */
offset = (*trampoline - (tpaddr + sizeof (small_jump_insn))) & 0xffff;
memcpy (buf, small_jump_insn, sizeof (small_jump_insn));
memcpy (buf + 2, &offset, 2);
memcpy (jjump_pad_insn, buf, sizeof (small_jump_insn));
*jjump_pad_insn_size = sizeof (small_jump_insn);
}
else
{
/* Else use a 32-bit relative jump instruction. */
offset = *jump_entry - (tpaddr + sizeof (jump_insn));
memcpy (buf, jump_insn, sizeof (jump_insn));
memcpy (buf + 1, &offset, 4);
memcpy (jjump_pad_insn, buf, sizeof (jump_insn));
*jjump_pad_insn_size = sizeof (jump_insn);
}
/* Return the end address of our pad. */
*jump_entry = buildaddr;
@ -1497,29 +1533,83 @@ x86_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
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)
{
#ifdef __x86_64__
if (register_size (0) == 8)
return amd64_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);
#endif
return i386_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);
}
/* Return the minimum instruction length for fast tracepoints on x86/x86-64
architectures. */
static int
x86_get_min_fast_tracepoint_insn_len (void)
{
static int warned_about_fast_tracepoints = 0;
#ifdef __x86_64__
/* On x86-64, 5-byte jump instructions with a 4-byte offset are always
used for fast tracepoints. */
if (register_size (0) == 8)
return 5;
#endif
if (in_process_agent_loaded ())
{
char errbuf[IPA_BUFSIZ];
errbuf[0] = '\0';
/* On x86, if trampolines are available, then 4-byte jump instructions
with a 2-byte offset may be used, otherwise 5-byte jump instructions
with a 4-byte offset are used instead. */
if (have_fast_tracepoint_trampoline_buffer (errbuf))
return 4;
else
{
/* GDB has no channel to explain to user why a shorter fast
tracepoint is not possible, but at least make GDBserver
mention that something has gone awry. */
if (!warned_about_fast_tracepoints)
{
warning ("4-byte fast tracepoints not available; %s\n", errbuf);
warned_about_fast_tracepoints = 1;
}
return 5;
}
}
else
{
/* Indicate that the minimum length is currently unknown since the IPA
has not loaded yet. */
return 0;
}
}
static void
@ -2873,5 +2963,6 @@ struct linux_target_ops the_low_target =
x86_supports_tracepoints,
x86_get_thread_area,
x86_install_fast_tracepoint_jump_pad,
x86_emit_ops
x86_emit_ops,
x86_get_min_fast_tracepoint_insn_len,
};