/* Branch trace support for GDB, the GNU debugger.
- Copyright (C) 2013 Free Software Foundation, Inc.
+ Copyright (C) 2013-2018 Free Software Foundation, Inc.
Contributed by Intel Corp. <markus.t.metzger@intel.com>
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 "btrace.h"
#include "gdbthread.h"
-#include "exceptions.h"
#include "inferior.h"
#include "target.h"
#include "record.h"
#include "source.h"
#include "filenames.h"
#include "xml-support.h"
+#include "regcache.h"
+#include "rsp-low.h"
+#include "gdbcmd.h"
+#include "cli/cli-utils.h"
+
+/* For maintenance commands. */
+#include "record-btrace.h"
+
+#include <inttypes.h>
+#include <ctype.h>
+#include <algorithm>
+
+/* Command lists for btrace maintenance commands. */
+static struct cmd_list_element *maint_btrace_cmdlist;
+static struct cmd_list_element *maint_btrace_set_cmdlist;
+static struct cmd_list_element *maint_btrace_show_cmdlist;
+static struct cmd_list_element *maint_btrace_pt_set_cmdlist;
+static struct cmd_list_element *maint_btrace_pt_show_cmdlist;
+
+/* Control whether to skip PAD packets when computing the packet history. */
+static int maint_btrace_pt_skip_pad = 1;
+
+static void btrace_add_pc (struct thread_info *tp);
/* Print a record debug message. Use do ... while (0) to avoid ambiguities
when used in if statements. */
#define DEBUG_FTRACE(msg, args...) DEBUG ("[ftrace] " msg, ##args)
-/* Initialize the instruction iterator. */
-
-static void
-btrace_init_insn_iterator (struct btrace_thread_info *btinfo)
-{
- DEBUG ("init insn iterator");
-
- btinfo->insn_iterator.begin = 1;
- btinfo->insn_iterator.end = 0;
-}
-
-/* Initialize the function iterator. */
-
-static void
-btrace_init_func_iterator (struct btrace_thread_info *btinfo)
-{
- DEBUG ("init func iterator");
-
- btinfo->func_iterator.begin = 1;
- btinfo->func_iterator.end = 0;
-}
-
-/* Compute the instruction trace from the block trace. */
-
-static VEC (btrace_inst_s) *
-compute_itrace (VEC (btrace_block_s) *btrace)
-{
- VEC (btrace_inst_s) *itrace;
- struct gdbarch *gdbarch;
- unsigned int b;
-
- DEBUG ("compute itrace");
-
- itrace = NULL;
- gdbarch = target_gdbarch ();
- b = VEC_length (btrace_block_s, btrace);
-
- while (b-- != 0)
- {
- btrace_block_s *block;
- CORE_ADDR pc;
-
- block = VEC_index (btrace_block_s, btrace, b);
- pc = block->begin;
-
- /* Add instructions for this block. */
- for (;;)
- {
- btrace_inst_s *inst;
- int size;
-
- /* We should hit the end of the block. Warn if we went too far. */
- if (block->end < pc)
- {
- warning (_("Recorded trace may be corrupted."));
- break;
- }
-
- inst = VEC_safe_push (btrace_inst_s, itrace, NULL);
- inst->pc = pc;
-
- /* We're done once we pushed the instruction at the end. */
- if (block->end == pc)
- break;
-
- size = gdb_insn_length (gdbarch, pc);
-
- /* Make sure we terminate if we fail to compute the size. */
- if (size <= 0)
- {
- warning (_("Recorded trace may be incomplete."));
- break;
- }
-
- pc += size;
- }
- }
-
- return itrace;
-}
-
/* Return the function name of a recorded function segment for printing.
This function never returns NULL. */
static const char *
-ftrace_print_function_name (struct btrace_func *bfun)
+ftrace_print_function_name (const struct btrace_function *bfun)
{
struct minimal_symbol *msym;
struct symbol *sym;
return SYMBOL_PRINT_NAME (sym);
if (msym != NULL)
- return SYMBOL_PRINT_NAME (msym);
+ return MSYMBOL_PRINT_NAME (msym);
return "<unknown>";
}
This function never returns NULL. */
static const char *
-ftrace_print_filename (struct btrace_func *bfun)
+ftrace_print_filename (const struct btrace_function *bfun)
{
struct symbol *sym;
const char *filename;
sym = bfun->sym;
if (sym != NULL)
- filename = symtab_to_filename_for_display (sym->symtab);
+ filename = symtab_to_filename_for_display (symbol_symtab (sym));
else
filename = "<unknown>";
return filename;
}
+/* Return a string representation of the address of an instruction.
+ This function never returns NULL. */
+
+static const char *
+ftrace_print_insn_addr (const struct btrace_insn *insn)
+{
+ if (insn == NULL)
+ return "<nil>";
+
+ return core_addr_to_string_nz (insn->pc);
+}
+
/* Print an ftrace debug status message. */
static void
-ftrace_debug (struct btrace_func *bfun, const char *prefix)
+ftrace_debug (const struct btrace_function *bfun, const char *prefix)
{
- DEBUG_FTRACE ("%s: fun = %s, file = %s, lines = [%d; %d], insn = [%u; %u]",
- prefix, ftrace_print_function_name (bfun),
- ftrace_print_filename (bfun), bfun->lbegin, bfun->lend,
- bfun->ibegin, bfun->iend);
+ const char *fun, *file;
+ unsigned int ibegin, iend;
+ int level;
+
+ fun = ftrace_print_function_name (bfun);
+ file = ftrace_print_filename (bfun);
+ level = bfun->level;
+
+ ibegin = bfun->insn_offset;
+ iend = ibegin + bfun->insn.size ();
+
+ DEBUG_FTRACE ("%s: fun = %s, file = %s, level = %d, insn = [%u; %u)",
+ prefix, fun, file, level, ibegin, iend);
}
-/* Initialize a recorded function segment. */
+/* Return the number of instructions in a given function call segment. */
-static void
-ftrace_init_func (struct btrace_func *bfun, struct minimal_symbol *mfun,
- struct symbol *fun, unsigned int idx)
+static unsigned int
+ftrace_call_num_insn (const struct btrace_function* bfun)
+{
+ if (bfun == NULL)
+ return 0;
+
+ /* A gap is always counted as one instruction. */
+ if (bfun->errcode != 0)
+ return 1;
+
+ return bfun->insn.size ();
+}
+
+/* Return the function segment with the given NUMBER or NULL if no such segment
+ exists. BTINFO is the branch trace information for the current thread. */
+
+static struct btrace_function *
+ftrace_find_call_by_number (struct btrace_thread_info *btinfo,
+ unsigned int number)
+{
+ if (number == 0 || number > btinfo->functions.size ())
+ return NULL;
+
+ return &btinfo->functions[number - 1];
+}
+
+/* A const version of the function above. */
+
+static const struct btrace_function *
+ftrace_find_call_by_number (const struct btrace_thread_info *btinfo,
+ unsigned int number)
{
- bfun->msym = mfun;
- bfun->sym = fun;
- bfun->lbegin = INT_MAX;
- bfun->lend = 0;
- bfun->ibegin = idx;
- bfun->iend = idx;
+ if (number == 0 || number > btinfo->functions.size ())
+ return NULL;
+
+ return &btinfo->functions[number - 1];
}
-/* Check whether the function has changed. */
+/* Return non-zero if BFUN does not match MFUN and FUN,
+ return zero otherwise. */
static int
-ftrace_function_switched (struct btrace_func *bfun,
- struct minimal_symbol *mfun, struct symbol *fun)
+ftrace_function_switched (const struct btrace_function *bfun,
+ const struct minimal_symbol *mfun,
+ const struct symbol *fun)
{
struct minimal_symbol *msym;
struct symbol *sym;
- /* The function changed if we did not have one before. */
- if (bfun == NULL)
- return 1;
-
msym = bfun->msym;
sym = bfun->sym;
/* If the minimal symbol changed, we certainly switched functions. */
if (mfun != NULL && msym != NULL
- && strcmp (SYMBOL_LINKAGE_NAME (mfun), SYMBOL_LINKAGE_NAME (msym)) != 0)
+ && strcmp (MSYMBOL_LINKAGE_NAME (mfun), MSYMBOL_LINKAGE_NAME (msym)) != 0)
return 1;
/* If the symbol changed, we certainly switched functions. */
return 1;
/* Check the location of those functions, as well. */
- bfname = symtab_to_fullname (sym->symtab);
- fname = symtab_to_fullname (fun->symtab);
+ bfname = symtab_to_fullname (symbol_symtab (sym));
+ fname = symtab_to_fullname (symbol_symtab (fun));
if (filename_cmp (fname, bfname) != 0)
return 1;
}
+ /* If we lost symbol information, we switched functions. */
+ if (!(msym == NULL && sym == NULL) && mfun == NULL && fun == NULL)
+ return 1;
+
+ /* If we gained symbol information, we switched functions. */
+ if (msym == NULL && sym == NULL && !(mfun == NULL && fun == NULL))
+ return 1;
+
return 0;
}
-/* Check if we should skip this file when generating the function call
- history. We would want to do that if, say, a macro that is defined
- in another file is expanded in this function. */
+/* Allocate and initialize a new branch trace function segment at the end of
+ the trace.
+ BTINFO is the branch trace information for the current thread.
+ MFUN and FUN are the symbol information we have for this function.
+ This invalidates all struct btrace_function pointer currently held. */
-static int
-ftrace_skip_file (struct btrace_func *bfun, const char *filename)
+static struct btrace_function *
+ftrace_new_function (struct btrace_thread_info *btinfo,
+ struct minimal_symbol *mfun,
+ struct symbol *fun)
{
- struct symbol *sym;
- const char *bfile;
-
- sym = bfun->sym;
+ int level;
+ unsigned int number, insn_offset;
- if (sym != NULL)
- bfile = symtab_to_fullname (sym->symtab);
+ if (btinfo->functions.empty ())
+ {
+ /* Start counting NUMBER and INSN_OFFSET at one. */
+ level = 0;
+ number = 1;
+ insn_offset = 1;
+ }
else
- bfile = "";
-
- if (filename == NULL)
- filename = "";
+ {
+ const struct btrace_function *prev = &btinfo->functions.back ();
+ level = prev->level;
+ number = prev->number + 1;
+ insn_offset = prev->insn_offset + ftrace_call_num_insn (prev);
+ }
- return (filename_cmp (bfile, filename) != 0);
+ btinfo->functions.emplace_back (mfun, fun, number, insn_offset, level);
+ return &btinfo->functions.back ();
}
-/* Compute the function trace from the instruction trace. */
+/* Update the UP field of a function segment. */
-static VEC (btrace_func_s) *
-compute_ftrace (VEC (btrace_inst_s) *itrace)
+static void
+ftrace_update_caller (struct btrace_function *bfun,
+ struct btrace_function *caller,
+ enum btrace_function_flag flags)
{
- VEC (btrace_func_s) *ftrace;
- struct btrace_inst *binst;
- struct btrace_func *bfun;
- unsigned int idx;
+ if (bfun->up != 0)
+ ftrace_debug (bfun, "updating caller");
- DEBUG ("compute ftrace");
-
- ftrace = NULL;
- bfun = NULL;
+ bfun->up = caller->number;
+ bfun->flags = flags;
- for (idx = 0; VEC_iterate (btrace_inst_s, itrace, idx, binst); ++idx)
- {
- struct symtab_and_line sal;
- struct bound_minimal_symbol mfun;
- struct symbol *fun;
- const char *filename;
- CORE_ADDR pc;
+ ftrace_debug (bfun, "set caller");
+ ftrace_debug (caller, "..to");
+}
- pc = binst->pc;
+/* Fix up the caller for all segments of a function. */
- /* Try to determine the function we're in. We use both types of symbols
- to avoid surprises when we sometimes get a full symbol and sometimes
- only a minimal symbol. */
- fun = find_pc_function (pc);
- mfun = lookup_minimal_symbol_by_pc (pc);
+static void
+ftrace_fixup_caller (struct btrace_thread_info *btinfo,
+ struct btrace_function *bfun,
+ struct btrace_function *caller,
+ enum btrace_function_flag flags)
+{
+ unsigned int prev, next;
- if (fun == NULL && mfun.minsym == NULL)
- {
- DEBUG_FTRACE ("no symbol at %u, pc=%s", idx,
- core_addr_to_string_nz (pc));
- continue;
- }
+ prev = bfun->prev;
+ next = bfun->next;
+ ftrace_update_caller (bfun, caller, flags);
- /* If we're switching functions, we start over. */
- if (ftrace_function_switched (bfun, mfun.minsym, fun))
- {
- bfun = VEC_safe_push (btrace_func_s, ftrace, NULL);
+ /* Update all function segments belonging to the same function. */
+ for (; prev != 0; prev = bfun->prev)
+ {
+ bfun = ftrace_find_call_by_number (btinfo, prev);
+ ftrace_update_caller (bfun, caller, flags);
+ }
- ftrace_init_func (bfun, mfun.minsym, fun, idx);
- ftrace_debug (bfun, "init");
- }
+ for (; next != 0; next = bfun->next)
+ {
+ bfun = ftrace_find_call_by_number (btinfo, next);
+ ftrace_update_caller (bfun, caller, flags);
+ }
+}
- /* Update the instruction range. */
- bfun->iend = idx;
- ftrace_debug (bfun, "update insns");
+/* Add a new function segment for a call at the end of the trace.
+ BTINFO is the branch trace information for the current thread.
+ MFUN and FUN are the symbol information we have for this function. */
- /* Let's see if we have source correlation, as well. */
- sal = find_pc_line (pc, 0);
- if (sal.symtab == NULL || sal.line == 0)
- {
- DEBUG_FTRACE ("no lines at %u, pc=%s", idx,
- core_addr_to_string_nz (pc));
- continue;
- }
+static struct btrace_function *
+ftrace_new_call (struct btrace_thread_info *btinfo,
+ struct minimal_symbol *mfun,
+ struct symbol *fun)
+{
+ const unsigned int length = btinfo->functions.size ();
+ struct btrace_function *bfun = ftrace_new_function (btinfo, mfun, fun);
- /* Check if we switched files. This could happen if, say, a macro that
- is defined in another file is expanded here. */
- filename = symtab_to_fullname (sal.symtab);
- if (ftrace_skip_file (bfun, filename))
- {
- DEBUG_FTRACE ("ignoring file at %u, pc=%s, file=%s", idx,
- core_addr_to_string_nz (pc), filename);
- continue;
- }
+ bfun->up = length;
+ bfun->level += 1;
- /* Update the line range. */
- bfun->lbegin = min (bfun->lbegin, sal.line);
- bfun->lend = max (bfun->lend, sal.line);
- ftrace_debug (bfun, "update lines");
- }
+ ftrace_debug (bfun, "new call");
- return ftrace;
+ return bfun;
}
-/* See btrace.h. */
+/* Add a new function segment for a tail call at the end of the trace.
+ BTINFO is the branch trace information for the current thread.
+ MFUN and FUN are the symbol information we have for this function. */
-void
-btrace_enable (struct thread_info *tp)
+static struct btrace_function *
+ftrace_new_tailcall (struct btrace_thread_info *btinfo,
+ struct minimal_symbol *mfun,
+ struct symbol *fun)
{
- if (tp->btrace.target != NULL)
- return;
+ const unsigned int length = btinfo->functions.size ();
+ struct btrace_function *bfun = ftrace_new_function (btinfo, mfun, fun);
- if (!target_supports_btrace ())
- error (_("Target does not support branch tracing."));
+ bfun->up = length;
+ bfun->level += 1;
+ bfun->flags |= BFUN_UP_LINKS_TO_TAILCALL;
- DEBUG ("enable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
+ ftrace_debug (bfun, "new tail call");
- tp->btrace.target = target_enable_btrace (tp->ptid);
+ return bfun;
}
-/* See btrace.h. */
-
-void
-btrace_disable (struct thread_info *tp)
+/* Return the caller of BFUN or NULL if there is none. This function skips
+ tail calls in the call chain. BTINFO is the branch trace information for
+ the current thread. */
+static struct btrace_function *
+ftrace_get_caller (struct btrace_thread_info *btinfo,
+ struct btrace_function *bfun)
{
- struct btrace_thread_info *btp = &tp->btrace;
- int errcode = 0;
+ for (; bfun != NULL; bfun = ftrace_find_call_by_number (btinfo, bfun->up))
+ if ((bfun->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0)
+ return ftrace_find_call_by_number (btinfo, bfun->up);
- if (btp->target == NULL)
- return;
+ return NULL;
+}
- DEBUG ("disable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
+/* Find the innermost caller in the back trace of BFUN with MFUN/FUN
+ symbol information. BTINFO is the branch trace information for the current
+ thread. */
- target_disable_btrace (btp->target);
- btp->target = NULL;
+static struct btrace_function *
+ftrace_find_caller (struct btrace_thread_info *btinfo,
+ struct btrace_function *bfun,
+ struct minimal_symbol *mfun,
+ struct symbol *fun)
+{
+ for (; bfun != NULL; bfun = ftrace_find_call_by_number (btinfo, bfun->up))
+ {
+ /* Skip functions with incompatible symbol information. */
+ if (ftrace_function_switched (bfun, mfun, fun))
+ continue;
- btrace_clear (tp);
+ /* This is the function segment we're looking for. */
+ break;
+ }
+
+ return bfun;
}
-/* See btrace.h. */
+/* Find the innermost caller in the back trace of BFUN, skipping all
+ function segments that do not end with a call instruction (e.g.
+ tail calls ending with a jump). BTINFO is the branch trace information for
+ the current thread. */
-void
-btrace_teardown (struct thread_info *tp)
+static struct btrace_function *
+ftrace_find_call (struct btrace_thread_info *btinfo,
+ struct btrace_function *bfun)
{
- struct btrace_thread_info *btp = &tp->btrace;
- int errcode = 0;
-
- if (btp->target == NULL)
- return;
+ for (; bfun != NULL; bfun = ftrace_find_call_by_number (btinfo, bfun->up))
+ {
+ /* Skip gaps. */
+ if (bfun->errcode != 0)
+ continue;
- DEBUG ("teardown thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
+ btrace_insn &last = bfun->insn.back ();
- target_teardown_btrace (btp->target);
- btp->target = NULL;
+ if (last.iclass == BTRACE_INSN_CALL)
+ break;
+ }
- btrace_clear (tp);
+ return bfun;
}
-/* See btrace.h. */
+/* Add a continuation segment for a function into which we return at the end of
+ the trace.
+ BTINFO is the branch trace information for the current thread.
+ MFUN and FUN are the symbol information we have for this function. */
-void
-btrace_fetch (struct thread_info *tp)
+static struct btrace_function *
+ftrace_new_return (struct btrace_thread_info *btinfo,
+ struct minimal_symbol *mfun,
+ struct symbol *fun)
{
- struct btrace_thread_info *btinfo;
- VEC (btrace_block_s) *btrace;
+ struct btrace_function *prev, *bfun, *caller;
- DEBUG ("fetch thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
+ bfun = ftrace_new_function (btinfo, mfun, fun);
+ prev = ftrace_find_call_by_number (btinfo, bfun->number - 1);
- btinfo = &tp->btrace;
- if (btinfo->target == NULL)
- return;
+ /* It is important to start at PREV's caller. Otherwise, we might find
+ PREV itself, if PREV is a recursive function. */
+ caller = ftrace_find_call_by_number (btinfo, prev->up);
+ caller = ftrace_find_caller (btinfo, caller, mfun, fun);
+ if (caller != NULL)
+ {
+ /* The caller of PREV is the preceding btrace function segment in this
+ function instance. */
+ gdb_assert (caller->next == 0);
- btrace = target_read_btrace (btinfo->target, btrace_read_new);
- if (VEC_empty (btrace_block_s, btrace))
- return;
+ caller->next = bfun->number;
+ bfun->prev = caller->number;
- btrace_clear (tp);
+ /* Maintain the function level. */
+ bfun->level = caller->level;
- btinfo->btrace = btrace;
- btinfo->itrace = compute_itrace (btinfo->btrace);
- btinfo->ftrace = compute_ftrace (btinfo->itrace);
+ /* Maintain the call stack. */
+ bfun->up = caller->up;
+ bfun->flags = caller->flags;
- /* Initialize branch trace iterators. */
- btrace_init_insn_iterator (btinfo);
- btrace_init_func_iterator (btinfo);
-}
+ ftrace_debug (bfun, "new return");
+ }
+ else
+ {
+ /* We did not find a caller. This could mean that something went
+ wrong or that the call is simply not included in the trace. */
-/* See btrace.h. */
+ /* Let's search for some actual call. */
+ caller = ftrace_find_call_by_number (btinfo, prev->up);
+ caller = ftrace_find_call (btinfo, caller);
+ if (caller == NULL)
+ {
+ /* There is no call in PREV's back trace. We assume that the
+ branch trace did not include it. */
-void
-btrace_clear (struct thread_info *tp)
-{
- struct btrace_thread_info *btinfo;
+ /* Let's find the topmost function and add a new caller for it.
+ This should handle a series of initial tail calls. */
+ while (prev->up != 0)
+ prev = ftrace_find_call_by_number (btinfo, prev->up);
- DEBUG ("clear thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
+ bfun->level = prev->level - 1;
- btinfo = &tp->btrace;
+ /* Fix up the call stack for PREV. */
+ ftrace_fixup_caller (btinfo, prev, bfun, BFUN_UP_LINKS_TO_RET);
- VEC_free (btrace_block_s, btinfo->btrace);
- VEC_free (btrace_inst_s, btinfo->itrace);
- VEC_free (btrace_func_s, btinfo->ftrace);
+ ftrace_debug (bfun, "new return - no caller");
+ }
+ else
+ {
+ /* There is a call in PREV's back trace to which we should have
+ returned but didn't. Let's start a new, separate back trace
+ from PREV's level. */
+ bfun->level = prev->level - 1;
+
+ /* We fix up the back trace for PREV but leave other function segments
+ on the same level as they are.
+ This should handle things like schedule () correctly where we're
+ switching contexts. */
+ prev->up = bfun->number;
+ prev->flags = BFUN_UP_LINKS_TO_RET;
+
+ ftrace_debug (bfun, "new return - unknown caller");
+ }
+ }
- btinfo->btrace = NULL;
- btinfo->itrace = NULL;
- btinfo->ftrace = NULL;
+ return bfun;
}
-/* See btrace.h. */
+/* Add a new function segment for a function switch at the end of the trace.
+ BTINFO is the branch trace information for the current thread.
+ MFUN and FUN are the symbol information we have for this function. */
-void
-btrace_free_objfile (struct objfile *objfile)
+static struct btrace_function *
+ftrace_new_switch (struct btrace_thread_info *btinfo,
+ struct minimal_symbol *mfun,
+ struct symbol *fun)
{
- struct thread_info *tp;
+ struct btrace_function *prev, *bfun;
- DEBUG ("free objfile");
+ /* This is an unexplained function switch. We can't really be sure about the
+ call stack, yet the best I can think of right now is to preserve it. */
+ bfun = ftrace_new_function (btinfo, mfun, fun);
+ prev = ftrace_find_call_by_number (btinfo, bfun->number - 1);
+ bfun->up = prev->up;
+ bfun->flags = prev->flags;
- ALL_THREADS (tp)
- btrace_clear (tp);
-}
+ ftrace_debug (bfun, "new switch");
-#if defined (HAVE_LIBEXPAT)
+ return bfun;
+}
-/* Check the btrace document version. */
+/* Add a new function segment for a gap in the trace due to a decode error at
+ the end of the trace.
+ BTINFO is the branch trace information for the current thread.
+ ERRCODE is the format-specific error code. */
-static void
-check_xml_btrace_version (struct gdb_xml_parser *parser,
- const struct gdb_xml_element *element,
- void *user_data, VEC (gdb_xml_value_s) *attributes)
+static struct btrace_function *
+ftrace_new_gap (struct btrace_thread_info *btinfo, int errcode,
+ std::vector<unsigned int> &gaps)
{
- const char *version = xml_find_attribute (attributes, "version")->value;
+ struct btrace_function *bfun;
- if (strcmp (version, "1.0") != 0)
- gdb_xml_error (parser, _("Unsupported btrace version: \"%s\""), version);
+ if (btinfo->functions.empty ())
+ bfun = ftrace_new_function (btinfo, NULL, NULL);
+ else
+ {
+ /* We hijack the previous function segment if it was empty. */
+ bfun = &btinfo->functions.back ();
+ if (bfun->errcode != 0 || !bfun->insn.empty ())
+ bfun = ftrace_new_function (btinfo, NULL, NULL);
+ }
+
+ bfun->errcode = errcode;
+ gaps.push_back (bfun->number);
+
+ ftrace_debug (bfun, "new gap");
+
+ return bfun;
}
-/* Parse a btrace "block" xml record. */
+/* Update the current function segment at the end of the trace in BTINFO with
+ respect to the instruction at PC. This may create new function segments.
+ Return the chronologically latest function segment, never NULL. */
-static void
-parse_xml_btrace_block (struct gdb_xml_parser *parser,
- const struct gdb_xml_element *element,
- void *user_data, VEC (gdb_xml_value_s) *attributes)
+static struct btrace_function *
+ftrace_update_function (struct btrace_thread_info *btinfo, CORE_ADDR pc)
{
- VEC (btrace_block_s) **btrace;
- struct btrace_block *block;
- ULONGEST *begin, *end;
+ struct bound_minimal_symbol bmfun;
+ struct minimal_symbol *mfun;
+ struct symbol *fun;
+ struct btrace_function *bfun;
+
+ /* Try to determine the function we're in. We use both types of symbols
+ to avoid surprises when we sometimes get a full symbol and sometimes
+ only a minimal symbol. */
+ fun = find_pc_function (pc);
+ bmfun = lookup_minimal_symbol_by_pc (pc);
+ mfun = bmfun.minsym;
+
+ if (fun == NULL && mfun == NULL)
+ DEBUG_FTRACE ("no symbol at %s", core_addr_to_string_nz (pc));
+
+ /* If we didn't have a function, we create one. */
+ if (btinfo->functions.empty ())
+ return ftrace_new_function (btinfo, mfun, fun);
+
+ /* If we had a gap before, we create a function. */
+ bfun = &btinfo->functions.back ();
+ if (bfun->errcode != 0)
+ return ftrace_new_function (btinfo, mfun, fun);
+
+ /* Check the last instruction, if we have one.
+ We do this check first, since it allows us to fill in the call stack
+ links in addition to the normal flow links. */
+ btrace_insn *last = NULL;
+ if (!bfun->insn.empty ())
+ last = &bfun->insn.back ();
+
+ if (last != NULL)
+ {
+ switch (last->iclass)
+ {
+ case BTRACE_INSN_RETURN:
+ {
+ const char *fname;
+
+ /* On some systems, _dl_runtime_resolve returns to the resolved
+ function instead of jumping to it. From our perspective,
+ however, this is a tailcall.
+ If we treated it as return, we wouldn't be able to find the
+ resolved function in our stack back trace. Hence, we would
+ lose the current stack back trace and start anew with an empty
+ back trace. When the resolved function returns, we would then
+ create a stack back trace with the same function names but
+ different frame id's. This will confuse stepping. */
+ fname = ftrace_print_function_name (bfun);
+ if (strcmp (fname, "_dl_runtime_resolve") == 0)
+ return ftrace_new_tailcall (btinfo, mfun, fun);
+
+ return ftrace_new_return (btinfo, mfun, fun);
+ }
+
+ case BTRACE_INSN_CALL:
+ /* Ignore calls to the next instruction. They are used for PIC. */
+ if (last->pc + last->size == pc)
+ break;
- btrace = user_data;
- block = VEC_safe_push (btrace_block_s, *btrace, NULL);
+ return ftrace_new_call (btinfo, mfun, fun);
- begin = xml_find_attribute (attributes, "begin")->value;
- end = xml_find_attribute (attributes, "end")->value;
+ case BTRACE_INSN_JUMP:
+ {
+ CORE_ADDR start;
- block->begin = *begin;
- block->end = *end;
-}
+ start = get_pc_function_start (pc);
-static const struct gdb_xml_attribute block_attributes[] = {
- { "begin", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
- { "end", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
- { NULL, GDB_XML_AF_NONE, NULL, NULL }
-};
+ /* A jump to the start of a function is (typically) a tail call. */
+ if (start == pc)
+ return ftrace_new_tailcall (btinfo, mfun, fun);
-static const struct gdb_xml_attribute btrace_attributes[] = {
- { "version", GDB_XML_AF_NONE, NULL, NULL },
- { NULL, GDB_XML_AF_NONE, NULL, NULL }
-};
+ /* If we can't determine the function for PC, we treat a jump at
+ the end of the block as tail call if we're switching functions
+ and as an intra-function branch if we don't. */
+ if (start == 0 && ftrace_function_switched (bfun, mfun, fun))
+ return ftrace_new_tailcall (btinfo, mfun, fun);
-static const struct gdb_xml_element btrace_children[] = {
- { "block", block_attributes, NULL,
- GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, parse_xml_btrace_block, NULL },
- { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
-};
+ break;
+ }
+ }
+ }
-static const struct gdb_xml_element btrace_elements[] = {
- { "btrace", btrace_attributes, btrace_children, GDB_XML_EF_NONE,
- check_xml_btrace_version, NULL },
- { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
-};
+ /* Check if we're switching functions for some other reason. */
+ if (ftrace_function_switched (bfun, mfun, fun))
+ {
+ DEBUG_FTRACE ("switching from %s in %s at %s",
+ ftrace_print_insn_addr (last),
+ ftrace_print_function_name (bfun),
+ ftrace_print_filename (bfun));
-#endif /* defined (HAVE_LIBEXPAT) */
+ return ftrace_new_switch (btinfo, mfun, fun);
+ }
-/* See btrace.h. */
+ return bfun;
+}
-VEC (btrace_block_s) *
-parse_xml_btrace (const char *buffer)
+/* Add the instruction at PC to BFUN's instructions. */
+
+static void
+ftrace_update_insns (struct btrace_function *bfun, const btrace_insn &insn)
{
- VEC (btrace_block_s) *btrace = NULL;
- struct cleanup *cleanup;
- int errcode;
+ bfun->insn.push_back (insn);
-#if defined (HAVE_LIBEXPAT)
+ if (record_debug > 1)
+ ftrace_debug (bfun, "update insn");
+}
- cleanup = make_cleanup (VEC_cleanup (btrace_block_s), &btrace);
- errcode = gdb_xml_parse_quick (_("btrace"), "btrace.dtd", btrace_elements,
- buffer, &btrace);
- if (errcode != 0)
+/* Classify the instruction at PC. */
+
+static enum btrace_insn_class
+ftrace_classify_insn (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ enum btrace_insn_class iclass;
+
+ iclass = BTRACE_INSN_OTHER;
+ TRY
+ {
+ if (gdbarch_insn_is_call (gdbarch, pc))
+ iclass = BTRACE_INSN_CALL;
+ else if (gdbarch_insn_is_ret (gdbarch, pc))
+ iclass = BTRACE_INSN_RETURN;
+ else if (gdbarch_insn_is_jump (gdbarch, pc))
+ iclass = BTRACE_INSN_JUMP;
+ }
+ CATCH (error, RETURN_MASK_ERROR)
{
- do_cleanups (cleanup);
- return NULL;
}
+ END_CATCH
- /* Keep parse results. */
- discard_cleanups (cleanup);
+ return iclass;
+}
+
+/* Try to match the back trace at LHS to the back trace at RHS. Returns the
+ number of matching function segments or zero if the back traces do not
+ match. BTINFO is the branch trace information for the current thread. */
+
+static int
+ftrace_match_backtrace (struct btrace_thread_info *btinfo,
+ struct btrace_function *lhs,
+ struct btrace_function *rhs)
+{
+ int matches;
+
+ for (matches = 0; lhs != NULL && rhs != NULL; ++matches)
+ {
+ if (ftrace_function_switched (lhs, rhs->msym, rhs->sym))
+ return 0;
+
+ lhs = ftrace_get_caller (btinfo, lhs);
+ rhs = ftrace_get_caller (btinfo, rhs);
+ }
+
+ return matches;
+}
+
+/* Add ADJUSTMENT to the level of BFUN and succeeding function segments.
+ BTINFO is the branch trace information for the current thread. */
+
+static void
+ftrace_fixup_level (struct btrace_thread_info *btinfo,
+ struct btrace_function *bfun, int adjustment)
+{
+ if (adjustment == 0)
+ return;
+
+ DEBUG_FTRACE ("fixup level (%+d)", adjustment);
+ ftrace_debug (bfun, "..bfun");
+
+ while (bfun != NULL)
+ {
+ bfun->level += adjustment;
+ bfun = ftrace_find_call_by_number (btinfo, bfun->number + 1);
+ }
+}
+
+/* Recompute the global level offset. Traverse the function trace and compute
+ the global level offset as the negative of the minimal function level. */
+
+static void
+ftrace_compute_global_level_offset (struct btrace_thread_info *btinfo)
+{
+ int level = INT_MAX;
+
+ if (btinfo == NULL)
+ return;
+
+ if (btinfo->functions.empty ())
+ return;
+
+ unsigned int length = btinfo->functions.size() - 1;
+ for (unsigned int i = 0; i < length; ++i)
+ level = std::min (level, btinfo->functions[i].level);
+
+ /* The last function segment contains the current instruction, which is not
+ really part of the trace. If it contains just this one instruction, we
+ ignore the segment. */
+ struct btrace_function *last = &btinfo->functions.back();
+ if (last->insn.size () != 1)
+ level = std::min (level, last->level);
+
+ DEBUG_FTRACE ("setting global level offset: %d", -level);
+ btinfo->level = -level;
+}
+
+/* Connect the function segments PREV and NEXT in a bottom-to-top walk as in
+ ftrace_connect_backtrace. BTINFO is the branch trace information for the
+ current thread. */
+
+static void
+ftrace_connect_bfun (struct btrace_thread_info *btinfo,
+ struct btrace_function *prev,
+ struct btrace_function *next)
+{
+ DEBUG_FTRACE ("connecting...");
+ ftrace_debug (prev, "..prev");
+ ftrace_debug (next, "..next");
+
+ /* The function segments are not yet connected. */
+ gdb_assert (prev->next == 0);
+ gdb_assert (next->prev == 0);
+
+ prev->next = next->number;
+ next->prev = prev->number;
+
+ /* We may have moved NEXT to a different function level. */
+ ftrace_fixup_level (btinfo, next, prev->level - next->level);
+
+ /* If we run out of back trace for one, let's use the other's. */
+ if (prev->up == 0)
+ {
+ const btrace_function_flags flags = next->flags;
+
+ next = ftrace_find_call_by_number (btinfo, next->up);
+ if (next != NULL)
+ {
+ DEBUG_FTRACE ("using next's callers");
+ ftrace_fixup_caller (btinfo, prev, next, flags);
+ }
+ }
+ else if (next->up == 0)
+ {
+ const btrace_function_flags flags = prev->flags;
+
+ prev = ftrace_find_call_by_number (btinfo, prev->up);
+ if (prev != NULL)
+ {
+ DEBUG_FTRACE ("using prev's callers");
+ ftrace_fixup_caller (btinfo, next, prev, flags);
+ }
+ }
+ else
+ {
+ /* PREV may have a tailcall caller, NEXT can't. If it does, fixup the up
+ link to add the tail callers to NEXT's back trace.
+
+ This removes NEXT->UP from NEXT's back trace. It will be added back
+ when connecting NEXT and PREV's callers - provided they exist.
+
+ If PREV's back trace consists of a series of tail calls without an
+ actual call, there will be no further connection and NEXT's caller will
+ be removed for good. To catch this case, we handle it here and connect
+ the top of PREV's back trace to NEXT's caller. */
+ if ((prev->flags & BFUN_UP_LINKS_TO_TAILCALL) != 0)
+ {
+ struct btrace_function *caller;
+ btrace_function_flags next_flags, prev_flags;
+
+ /* We checked NEXT->UP above so CALLER can't be NULL. */
+ caller = ftrace_find_call_by_number (btinfo, next->up);
+ next_flags = next->flags;
+ prev_flags = prev->flags;
+
+ DEBUG_FTRACE ("adding prev's tail calls to next");
+
+ prev = ftrace_find_call_by_number (btinfo, prev->up);
+ ftrace_fixup_caller (btinfo, next, prev, prev_flags);
+
+ for (; prev != NULL; prev = ftrace_find_call_by_number (btinfo,
+ prev->up))
+ {
+ /* At the end of PREV's back trace, continue with CALLER. */
+ if (prev->up == 0)
+ {
+ DEBUG_FTRACE ("fixing up link for tailcall chain");
+ ftrace_debug (prev, "..top");
+ ftrace_debug (caller, "..up");
+
+ ftrace_fixup_caller (btinfo, prev, caller, next_flags);
+
+ /* If we skipped any tail calls, this may move CALLER to a
+ different function level.
+
+ Note that changing CALLER's level is only OK because we
+ know that this is the last iteration of the bottom-to-top
+ walk in ftrace_connect_backtrace.
+
+ Otherwise we will fix up CALLER's level when we connect it
+ to PREV's caller in the next iteration. */
+ ftrace_fixup_level (btinfo, caller,
+ prev->level - caller->level - 1);
+ break;
+ }
+
+ /* There's nothing to do if we find a real call. */
+ if ((prev->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0)
+ {
+ DEBUG_FTRACE ("will fix up link in next iteration");
+ break;
+ }
+ }
+ }
+ }
+}
+
+/* Connect function segments on the same level in the back trace at LHS and RHS.
+ The back traces at LHS and RHS are expected to match according to
+ ftrace_match_backtrace. BTINFO is the branch trace information for the
+ current thread. */
+
+static void
+ftrace_connect_backtrace (struct btrace_thread_info *btinfo,
+ struct btrace_function *lhs,
+ struct btrace_function *rhs)
+{
+ while (lhs != NULL && rhs != NULL)
+ {
+ struct btrace_function *prev, *next;
+
+ gdb_assert (!ftrace_function_switched (lhs, rhs->msym, rhs->sym));
+
+ /* Connecting LHS and RHS may change the up link. */
+ prev = lhs;
+ next = rhs;
+
+ lhs = ftrace_get_caller (btinfo, lhs);
+ rhs = ftrace_get_caller (btinfo, rhs);
+
+ ftrace_connect_bfun (btinfo, prev, next);
+ }
+}
+
+/* Bridge the gap between two function segments left and right of a gap if their
+ respective back traces match in at least MIN_MATCHES functions. BTINFO is
+ the branch trace information for the current thread.
+
+ Returns non-zero if the gap could be bridged, zero otherwise. */
+
+static int
+ftrace_bridge_gap (struct btrace_thread_info *btinfo,
+ struct btrace_function *lhs, struct btrace_function *rhs,
+ int min_matches)
+{
+ struct btrace_function *best_l, *best_r, *cand_l, *cand_r;
+ int best_matches;
+
+ DEBUG_FTRACE ("checking gap at insn %u (req matches: %d)",
+ rhs->insn_offset - 1, min_matches);
+
+ best_matches = 0;
+ best_l = NULL;
+ best_r = NULL;
+
+ /* We search the back traces of LHS and RHS for valid connections and connect
+ the two functon segments that give the longest combined back trace. */
+
+ for (cand_l = lhs; cand_l != NULL;
+ cand_l = ftrace_get_caller (btinfo, cand_l))
+ for (cand_r = rhs; cand_r != NULL;
+ cand_r = ftrace_get_caller (btinfo, cand_r))
+ {
+ int matches;
+
+ matches = ftrace_match_backtrace (btinfo, cand_l, cand_r);
+ if (best_matches < matches)
+ {
+ best_matches = matches;
+ best_l = cand_l;
+ best_r = cand_r;
+ }
+ }
+
+ /* We need at least MIN_MATCHES matches. */
+ gdb_assert (min_matches > 0);
+ if (best_matches < min_matches)
+ return 0;
+
+ DEBUG_FTRACE ("..matches: %d", best_matches);
+
+ /* We will fix up the level of BEST_R and succeeding function segments such
+ that BEST_R's level matches BEST_L's when we connect BEST_L to BEST_R.
+
+ This will ignore the level of RHS and following if BEST_R != RHS. I.e. if
+ BEST_R is a successor of RHS in the back trace of RHS (phases 1 and 3).
+
+ To catch this, we already fix up the level here where we can start at RHS
+ instead of at BEST_R. We will ignore the level fixup when connecting
+ BEST_L to BEST_R as they will already be on the same level. */
+ ftrace_fixup_level (btinfo, rhs, best_l->level - best_r->level);
+
+ ftrace_connect_backtrace (btinfo, best_l, best_r);
+
+ return best_matches;
+}
+
+/* Try to bridge gaps due to overflow or decode errors by connecting the
+ function segments that are separated by the gap. */
+
+static void
+btrace_bridge_gaps (struct thread_info *tp, std::vector<unsigned int> &gaps)
+{
+ struct btrace_thread_info *btinfo = &tp->btrace;
+ std::vector<unsigned int> remaining;
+ int min_matches;
+
+ DEBUG ("bridge gaps");
+
+ /* We require a minimum amount of matches for bridging a gap. The number of
+ required matches will be lowered with each iteration.
+
+ The more matches the higher our confidence that the bridging is correct.
+ For big gaps or small traces, however, it may not be feasible to require a
+ high number of matches. */
+ for (min_matches = 5; min_matches > 0; --min_matches)
+ {
+ /* Let's try to bridge as many gaps as we can. In some cases, we need to
+ skip a gap and revisit it again after we closed later gaps. */
+ while (!gaps.empty ())
+ {
+ for (const unsigned int number : gaps)
+ {
+ struct btrace_function *gap, *lhs, *rhs;
+ int bridged;
+
+ gap = ftrace_find_call_by_number (btinfo, number);
+
+ /* We may have a sequence of gaps if we run from one error into
+ the next as we try to re-sync onto the trace stream. Ignore
+ all but the leftmost gap in such a sequence.
+
+ Also ignore gaps at the beginning of the trace. */
+ lhs = ftrace_find_call_by_number (btinfo, gap->number - 1);
+ if (lhs == NULL || lhs->errcode != 0)
+ continue;
+
+ /* Skip gaps to the right. */
+ rhs = ftrace_find_call_by_number (btinfo, gap->number + 1);
+ while (rhs != NULL && rhs->errcode != 0)
+ rhs = ftrace_find_call_by_number (btinfo, rhs->number + 1);
+
+ /* Ignore gaps at the end of the trace. */
+ if (rhs == NULL)
+ continue;
+
+ bridged = ftrace_bridge_gap (btinfo, lhs, rhs, min_matches);
+
+ /* Keep track of gaps we were not able to bridge and try again.
+ If we just pushed them to the end of GAPS we would risk an
+ infinite loop in case we simply cannot bridge a gap. */
+ if (bridged == 0)
+ remaining.push_back (number);
+ }
+
+ /* Let's see if we made any progress. */
+ if (remaining.size () == gaps.size ())
+ break;
+
+ gaps.clear ();
+ gaps.swap (remaining);
+ }
+
+ /* We get here if either GAPS is empty or if GAPS equals REMAINING. */
+ if (gaps.empty ())
+ break;
+
+ remaining.clear ();
+ }
+
+ /* We may omit this in some cases. Not sure it is worth the extra
+ complication, though. */
+ ftrace_compute_global_level_offset (btinfo);
+}
+
+/* Compute the function branch trace from BTS trace. */
+
+static void
+btrace_compute_ftrace_bts (struct thread_info *tp,
+ const struct btrace_data_bts *btrace,
+ std::vector<unsigned int> &gaps)
+{
+ struct btrace_thread_info *btinfo;
+ struct gdbarch *gdbarch;
+ unsigned int blk;
+ int level;
+
+ gdbarch = target_gdbarch ();
+ btinfo = &tp->btrace;
+ blk = VEC_length (btrace_block_s, btrace->blocks);
+
+ if (btinfo->functions.empty ())
+ level = INT_MAX;
+ else
+ level = -btinfo->level;
+
+ while (blk != 0)
+ {
+ btrace_block_s *block;
+ CORE_ADDR pc;
+
+ blk -= 1;
+
+ block = VEC_index (btrace_block_s, btrace->blocks, blk);
+ pc = block->begin;
+
+ for (;;)
+ {
+ struct btrace_function *bfun;
+ struct btrace_insn insn;
+ int size;
+
+ /* We should hit the end of the block. Warn if we went too far. */
+ if (block->end < pc)
+ {
+ /* Indicate the gap in the trace. */
+ bfun = ftrace_new_gap (btinfo, BDE_BTS_OVERFLOW, gaps);
+
+ warning (_("Recorded trace may be corrupted at instruction "
+ "%u (pc = %s)."), bfun->insn_offset - 1,
+ core_addr_to_string_nz (pc));
+
+ break;
+ }
+
+ bfun = ftrace_update_function (btinfo, pc);
+
+ /* Maintain the function level offset.
+ For all but the last block, we do it here. */
+ if (blk != 0)
+ level = std::min (level, bfun->level);
+
+ size = 0;
+ TRY
+ {
+ size = gdb_insn_length (gdbarch, pc);
+ }
+ CATCH (error, RETURN_MASK_ERROR)
+ {
+ }
+ END_CATCH
+
+ insn.pc = pc;
+ insn.size = size;
+ insn.iclass = ftrace_classify_insn (gdbarch, pc);
+ insn.flags = 0;
+
+ ftrace_update_insns (bfun, insn);
+
+ /* We're done once we pushed the instruction at the end. */
+ if (block->end == pc)
+ break;
+
+ /* We can't continue if we fail to compute the size. */
+ if (size <= 0)
+ {
+ /* Indicate the gap in the trace. We just added INSN so we're
+ not at the beginning. */
+ bfun = ftrace_new_gap (btinfo, BDE_BTS_INSN_SIZE, gaps);
+
+ warning (_("Recorded trace may be incomplete at instruction %u "
+ "(pc = %s)."), bfun->insn_offset - 1,
+ core_addr_to_string_nz (pc));
+
+ break;
+ }
+
+ pc += size;
+
+ /* Maintain the function level offset.
+ For the last block, we do it here to not consider the last
+ instruction.
+ Since the last instruction corresponds to the current instruction
+ and is not really part of the execution history, it shouldn't
+ affect the level. */
+ if (blk == 0)
+ level = std::min (level, bfun->level);
+ }
+ }
+
+ /* LEVEL is the minimal function level of all btrace function segments.
+ Define the global level offset to -LEVEL so all function levels are
+ normalized to start at zero. */
+ btinfo->level = -level;
+}
+
+#if defined (HAVE_LIBIPT)
+
+static enum btrace_insn_class
+pt_reclassify_insn (enum pt_insn_class iclass)
+{
+ switch (iclass)
+ {
+ case ptic_call:
+ return BTRACE_INSN_CALL;
+
+ case ptic_return:
+ return BTRACE_INSN_RETURN;
+
+ case ptic_jump:
+ return BTRACE_INSN_JUMP;
+
+ default:
+ return BTRACE_INSN_OTHER;
+ }
+}
+
+/* Return the btrace instruction flags for INSN. */
+
+static btrace_insn_flags
+pt_btrace_insn_flags (const struct pt_insn &insn)
+{
+ btrace_insn_flags flags = 0;
+
+ if (insn.speculative)
+ flags |= BTRACE_INSN_FLAG_SPECULATIVE;
+
+ return flags;
+}
+
+/* Return the btrace instruction for INSN. */
+
+static btrace_insn
+pt_btrace_insn (const struct pt_insn &insn)
+{
+ return {(CORE_ADDR) insn.ip, (gdb_byte) insn.size,
+ pt_reclassify_insn (insn.iclass),
+ pt_btrace_insn_flags (insn)};
+}
+
+/* Handle instruction decode events (libipt-v2). */
+
+static int
+handle_pt_insn_events (struct btrace_thread_info *btinfo,
+ struct pt_insn_decoder *decoder,
+ std::vector<unsigned int> &gaps, int status)
+{
+#if defined (HAVE_PT_INSN_EVENT)
+ while (status & pts_event_pending)
+ {
+ struct btrace_function *bfun;
+ struct pt_event event;
+ uint64_t offset;
+
+ status = pt_insn_event (decoder, &event, sizeof (event));
+ if (status < 0)
+ break;
+
+ switch (event.type)
+ {
+ default:
+ break;
+
+ case ptev_enabled:
+ if (event.variant.enabled.resumed == 0 && !btinfo->functions.empty ())
+ {
+ bfun = ftrace_new_gap (btinfo, BDE_PT_DISABLED, gaps);
+
+ pt_insn_get_offset (decoder, &offset);
+
+ warning (_("Non-contiguous trace at instruction %u (offset = 0x%"
+ PRIx64 ")."), bfun->insn_offset - 1, offset);
+ }
+
+ break;
+
+ case ptev_overflow:
+ bfun = ftrace_new_gap (btinfo, BDE_PT_OVERFLOW, gaps);
+
+ pt_insn_get_offset (decoder, &offset);
+
+ warning (_("Overflow at instruction %u (offset = 0x%" PRIx64 ")."),
+ bfun->insn_offset - 1, offset);
+
+ break;
+ }
+ }
+#endif /* defined (HAVE_PT_INSN_EVENT) */
+
+ return status;
+}
+
+/* Handle events indicated by flags in INSN (libipt-v1). */
+
+static void
+handle_pt_insn_event_flags (struct btrace_thread_info *btinfo,
+ struct pt_insn_decoder *decoder,
+ const struct pt_insn &insn,
+ std::vector<unsigned int> &gaps)
+{
+#if defined (HAVE_STRUCT_PT_INSN_ENABLED)
+ /* Tracing is disabled and re-enabled each time we enter the kernel. Most
+ times, we continue from the same instruction we stopped before. This is
+ indicated via the RESUMED instruction flag. The ENABLED instruction flag
+ means that we continued from some other instruction. Indicate this as a
+ trace gap except when tracing just started. */
+ if (insn.enabled && !btinfo->functions.empty ())
+ {
+ struct btrace_function *bfun;
+ uint64_t offset;
+
+ bfun = ftrace_new_gap (btinfo, BDE_PT_DISABLED, gaps);
+
+ pt_insn_get_offset (decoder, &offset);
+
+ warning (_("Non-contiguous trace at instruction %u (offset = 0x%" PRIx64
+ ", pc = 0x%" PRIx64 ")."), bfun->insn_offset - 1, offset,
+ insn.ip);
+ }
+#endif /* defined (HAVE_STRUCT_PT_INSN_ENABLED) */
+
+#if defined (HAVE_STRUCT_PT_INSN_RESYNCED)
+ /* Indicate trace overflows. */
+ if (insn.resynced)
+ {
+ struct btrace_function *bfun;
+ uint64_t offset;
+
+ bfun = ftrace_new_gap (btinfo, BDE_PT_OVERFLOW, gaps);
+
+ pt_insn_get_offset (decoder, &offset);
+
+ warning (_("Overflow at instruction %u (offset = 0x%" PRIx64 ", pc = 0x%"
+ PRIx64 ")."), bfun->insn_offset - 1, offset, insn.ip);
+ }
+#endif /* defined (HAVE_STRUCT_PT_INSN_RESYNCED) */
+}
+
+/* Add function branch trace to BTINFO using DECODER. */
+
+static void
+ftrace_add_pt (struct btrace_thread_info *btinfo,
+ struct pt_insn_decoder *decoder,
+ int *plevel,
+ std::vector<unsigned int> &gaps)
+{
+ struct btrace_function *bfun;
+ uint64_t offset;
+ int status;
+
+ for (;;)
+ {
+ struct pt_insn insn;
+
+ status = pt_insn_sync_forward (decoder);
+ if (status < 0)
+ {
+ if (status != -pte_eos)
+ warning (_("Failed to synchronize onto the Intel Processor "
+ "Trace stream: %s."), pt_errstr (pt_errcode (status)));
+ break;
+ }
+
+ for (;;)
+ {
+ /* Handle events from the previous iteration or synchronization. */
+ status = handle_pt_insn_events (btinfo, decoder, gaps, status);
+ if (status < 0)
+ break;
+
+ status = pt_insn_next (decoder, &insn, sizeof(insn));
+ if (status < 0)
+ break;
+
+ /* Handle events indicated by flags in INSN. */
+ handle_pt_insn_event_flags (btinfo, decoder, insn, gaps);
+
+ bfun = ftrace_update_function (btinfo, insn.ip);
+
+ /* Maintain the function level offset. */
+ *plevel = std::min (*plevel, bfun->level);
+
+ ftrace_update_insns (bfun, pt_btrace_insn (insn));
+ }
+
+ if (status == -pte_eos)
+ break;
+
+ /* Indicate the gap in the trace. */
+ bfun = ftrace_new_gap (btinfo, status, gaps);
+
+ pt_insn_get_offset (decoder, &offset);
+
+ warning (_("Decode error (%d) at instruction %u (offset = 0x%" PRIx64
+ ", pc = 0x%" PRIx64 "): %s."), status, bfun->insn_offset - 1,
+ offset, insn.ip, pt_errstr (pt_errcode (status)));
+ }
+}
+
+/* A callback function to allow the trace decoder to read the inferior's
+ memory. */
+
+static int
+btrace_pt_readmem_callback (gdb_byte *buffer, size_t size,
+ const struct pt_asid *asid, uint64_t pc,
+ void *context)
+{
+ int result, errcode;
+
+ result = (int) size;
+ TRY
+ {
+ errcode = target_read_code ((CORE_ADDR) pc, buffer, size);
+ if (errcode != 0)
+ result = -pte_nomap;
+ }
+ CATCH (error, RETURN_MASK_ERROR)
+ {
+ result = -pte_nomap;
+ }
+ END_CATCH
+
+ return result;
+}
+
+/* Translate the vendor from one enum to another. */
+
+static enum pt_cpu_vendor
+pt_translate_cpu_vendor (enum btrace_cpu_vendor vendor)
+{
+ switch (vendor)
+ {
+ default:
+ return pcv_unknown;
+
+ case CV_INTEL:
+ return pcv_intel;
+ }
+}
+
+/* Finalize the function branch trace after decode. */
+
+static void btrace_finalize_ftrace_pt (struct pt_insn_decoder *decoder,
+ struct thread_info *tp, int level)
+{
+ pt_insn_free_decoder (decoder);
+
+ /* LEVEL is the minimal function level of all btrace function segments.
+ Define the global level offset to -LEVEL so all function levels are
+ normalized to start at zero. */
+ tp->btrace.level = -level;
+
+ /* Add a single last instruction entry for the current PC.
+ This allows us to compute the backtrace at the current PC using both
+ standard unwind and btrace unwind.
+ This extra entry is ignored by all record commands. */
+ btrace_add_pc (tp);
+}
+
+/* Compute the function branch trace from Intel Processor Trace
+ format. */
+
+static void
+btrace_compute_ftrace_pt (struct thread_info *tp,
+ const struct btrace_data_pt *btrace,
+ std::vector<unsigned int> &gaps)
+{
+ struct btrace_thread_info *btinfo;
+ struct pt_insn_decoder *decoder;
+ struct pt_config config;
+ int level, errcode;
+
+ if (btrace->size == 0)
+ return;
+
+ btinfo = &tp->btrace;
+ if (btinfo->functions.empty ())
+ level = INT_MAX;
+ else
+ level = -btinfo->level;
+
+ pt_config_init(&config);
+ config.begin = btrace->data;
+ config.end = btrace->data + btrace->size;
+
+ /* We treat an unknown vendor as 'no errata'. */
+ if (btrace->config.cpu.vendor != CV_UNKNOWN)
+ {
+ config.cpu.vendor
+ = pt_translate_cpu_vendor (btrace->config.cpu.vendor);
+ config.cpu.family = btrace->config.cpu.family;
+ config.cpu.model = btrace->config.cpu.model;
+ config.cpu.stepping = btrace->config.cpu.stepping;
+
+ errcode = pt_cpu_errata (&config.errata, &config.cpu);
+ if (errcode < 0)
+ error (_("Failed to configure the Intel Processor Trace "
+ "decoder: %s."), pt_errstr (pt_errcode (errcode)));
+ }
+
+ decoder = pt_insn_alloc_decoder (&config);
+ if (decoder == NULL)
+ error (_("Failed to allocate the Intel Processor Trace decoder."));
+
+ TRY
+ {
+ struct pt_image *image;
+
+ image = pt_insn_get_image(decoder);
+ if (image == NULL)
+ error (_("Failed to configure the Intel Processor Trace decoder."));
+
+ errcode = pt_image_set_callback(image, btrace_pt_readmem_callback, NULL);
+ if (errcode < 0)
+ error (_("Failed to configure the Intel Processor Trace decoder: "
+ "%s."), pt_errstr (pt_errcode (errcode)));
+
+ ftrace_add_pt (btinfo, decoder, &level, gaps);
+ }
+ CATCH (error, RETURN_MASK_ALL)
+ {
+ /* Indicate a gap in the trace if we quit trace processing. */
+ if (error.reason == RETURN_QUIT && !btinfo->functions.empty ())
+ ftrace_new_gap (btinfo, BDE_PT_USER_QUIT, gaps);
+
+ btrace_finalize_ftrace_pt (decoder, tp, level);
+
+ throw_exception (error);
+ }
+ END_CATCH
+
+ btrace_finalize_ftrace_pt (decoder, tp, level);
+}
+
+#else /* defined (HAVE_LIBIPT) */
+
+static void
+btrace_compute_ftrace_pt (struct thread_info *tp,
+ const struct btrace_data_pt *btrace,
+ std::vector<unsigned int> &gaps)
+{
+ internal_error (__FILE__, __LINE__, _("Unexpected branch trace format."));
+}
+
+#endif /* defined (HAVE_LIBIPT) */
+
+/* Compute the function branch trace from a block branch trace BTRACE for
+ a thread given by BTINFO. If CPU is not NULL, overwrite the cpu in the
+ branch trace configuration. This is currently only used for the PT
+ format. */
+
+static void
+btrace_compute_ftrace_1 (struct thread_info *tp,
+ struct btrace_data *btrace,
+ const struct btrace_cpu *cpu,
+ std::vector<unsigned int> &gaps)
+{
+ DEBUG ("compute ftrace");
+
+ switch (btrace->format)
+ {
+ case BTRACE_FORMAT_NONE:
+ return;
+
+ case BTRACE_FORMAT_BTS:
+ btrace_compute_ftrace_bts (tp, &btrace->variant.bts, gaps);
+ return;
+
+ case BTRACE_FORMAT_PT:
+ /* Overwrite the cpu we use for enabling errata workarounds. */
+ if (cpu != nullptr)
+ btrace->variant.pt.config.cpu = *cpu;
+
+ btrace_compute_ftrace_pt (tp, &btrace->variant.pt, gaps);
+ return;
+ }
+
+ internal_error (__FILE__, __LINE__, _("Unkown branch trace format."));
+}
+
+static void
+btrace_finalize_ftrace (struct thread_info *tp, std::vector<unsigned int> &gaps)
+{
+ if (!gaps.empty ())
+ {
+ tp->btrace.ngaps += gaps.size ();
+ btrace_bridge_gaps (tp, gaps);
+ }
+}
+
+static void
+btrace_compute_ftrace (struct thread_info *tp, struct btrace_data *btrace,
+ const struct btrace_cpu *cpu)
+{
+ std::vector<unsigned int> gaps;
+
+ TRY
+ {
+ btrace_compute_ftrace_1 (tp, btrace, cpu, gaps);
+ }
+ CATCH (error, RETURN_MASK_ALL)
+ {
+ btrace_finalize_ftrace (tp, gaps);
+
+ throw_exception (error);
+ }
+ END_CATCH
+
+ btrace_finalize_ftrace (tp, gaps);
+}
+
+/* Add an entry for the current PC. */
+
+static void
+btrace_add_pc (struct thread_info *tp)
+{
+ struct btrace_data btrace;
+ struct btrace_block *block;
+ struct regcache *regcache;
+ struct cleanup *cleanup;
+ CORE_ADDR pc;
+
+ regcache = get_thread_regcache (tp->ptid);
+ pc = regcache_read_pc (regcache);
+
+ btrace_data_init (&btrace);
+ btrace.format = BTRACE_FORMAT_BTS;
+ btrace.variant.bts.blocks = NULL;
+
+ cleanup = make_cleanup_btrace_data (&btrace);
+
+ block = VEC_safe_push (btrace_block_s, btrace.variant.bts.blocks, NULL);
+ block->begin = pc;
+ block->end = pc;
+
+ btrace_compute_ftrace (tp, &btrace, NULL);
+
+ do_cleanups (cleanup);
+}
+
+/* See btrace.h. */
+
+void
+btrace_enable (struct thread_info *tp, const struct btrace_config *conf)
+{
+ if (tp->btrace.target != NULL)
+ return;
+
+#if !defined (HAVE_LIBIPT)
+ if (conf->format == BTRACE_FORMAT_PT)
+ error (_("Intel Processor Trace support was disabled at compile time."));
+#endif /* !defined (HAVE_LIBIPT) */
+
+ DEBUG ("enable thread %s (%s)", print_thread_id (tp),
+ target_pid_to_str (tp->ptid));
+
+ tp->btrace.target = target_enable_btrace (tp->ptid, conf);
+
+ /* We're done if we failed to enable tracing. */
+ if (tp->btrace.target == NULL)
+ return;
+
+ /* We need to undo the enable in case of errors. */
+ TRY
+ {
+ /* Add an entry for the current PC so we start tracing from where we
+ enabled it.
+
+ If we can't access TP's registers, TP is most likely running. In this
+ case, we can't really say where tracing was enabled so it should be
+ safe to simply skip this step.
+
+ This is not relevant for BTRACE_FORMAT_PT since the trace will already
+ start at the PC at which tracing was enabled. */
+ if (conf->format != BTRACE_FORMAT_PT
+ && can_access_registers_ptid (tp->ptid))
+ btrace_add_pc (tp);
+ }
+ CATCH (exception, RETURN_MASK_ALL)
+ {
+ btrace_disable (tp);
+
+ throw_exception (exception);
+ }
+ END_CATCH
+}
+
+/* See btrace.h. */
+
+const struct btrace_config *
+btrace_conf (const struct btrace_thread_info *btinfo)
+{
+ if (btinfo->target == NULL)
+ return NULL;
+
+ return target_btrace_conf (btinfo->target);
+}
+
+/* See btrace.h. */
+
+void
+btrace_disable (struct thread_info *tp)
+{
+ struct btrace_thread_info *btp = &tp->btrace;
+
+ if (btp->target == NULL)
+ return;
+
+ DEBUG ("disable thread %s (%s)", print_thread_id (tp),
+ target_pid_to_str (tp->ptid));
+
+ target_disable_btrace (btp->target);
+ btp->target = NULL;
+
+ btrace_clear (tp);
+}
+
+/* See btrace.h. */
+
+void
+btrace_teardown (struct thread_info *tp)
+{
+ struct btrace_thread_info *btp = &tp->btrace;
+
+ if (btp->target == NULL)
+ return;
+
+ DEBUG ("teardown thread %s (%s)", print_thread_id (tp),
+ target_pid_to_str (tp->ptid));
+
+ target_teardown_btrace (btp->target);
+ btp->target = NULL;
+
+ btrace_clear (tp);
+}
+
+/* Stitch branch trace in BTS format. */
+
+static int
+btrace_stitch_bts (struct btrace_data_bts *btrace, struct thread_info *tp)
+{
+ struct btrace_thread_info *btinfo;
+ struct btrace_function *last_bfun;
+ btrace_block_s *first_new_block;
+
+ btinfo = &tp->btrace;
+ gdb_assert (!btinfo->functions.empty ());
+ gdb_assert (!VEC_empty (btrace_block_s, btrace->blocks));
+
+ last_bfun = &btinfo->functions.back ();
+
+ /* If the existing trace ends with a gap, we just glue the traces
+ together. We need to drop the last (i.e. chronologically first) block
+ of the new trace, though, since we can't fill in the start address.*/
+ if (last_bfun->insn.empty ())
+ {
+ VEC_pop (btrace_block_s, btrace->blocks);
+ return 0;
+ }
+
+ /* Beware that block trace starts with the most recent block, so the
+ chronologically first block in the new trace is the last block in
+ the new trace's block vector. */
+ first_new_block = VEC_last (btrace_block_s, btrace->blocks);
+ const btrace_insn &last_insn = last_bfun->insn.back ();
+
+ /* If the current PC at the end of the block is the same as in our current
+ trace, there are two explanations:
+ 1. we executed the instruction and some branch brought us back.
+ 2. we have not made any progress.
+ In the first case, the delta trace vector should contain at least two
+ entries.
+ In the second case, the delta trace vector should contain exactly one
+ entry for the partial block containing the current PC. Remove it. */
+ if (first_new_block->end == last_insn.pc
+ && VEC_length (btrace_block_s, btrace->blocks) == 1)
+ {
+ VEC_pop (btrace_block_s, btrace->blocks);
+ return 0;
+ }
+
+ DEBUG ("stitching %s to %s", ftrace_print_insn_addr (&last_insn),
+ core_addr_to_string_nz (first_new_block->end));
+
+ /* Do a simple sanity check to make sure we don't accidentally end up
+ with a bad block. This should not occur in practice. */
+ if (first_new_block->end < last_insn.pc)
+ {
+ warning (_("Error while trying to read delta trace. Falling back to "
+ "a full read."));
+ return -1;
+ }
+
+ /* We adjust the last block to start at the end of our current trace. */
+ gdb_assert (first_new_block->begin == 0);
+ first_new_block->begin = last_insn.pc;
+
+ /* We simply pop the last insn so we can insert it again as part of
+ the normal branch trace computation.
+ Since instruction iterators are based on indices in the instructions
+ vector, we don't leave any pointers dangling. */
+ DEBUG ("pruning insn at %s for stitching",
+ ftrace_print_insn_addr (&last_insn));
+
+ last_bfun->insn.pop_back ();
+
+ /* The instructions vector may become empty temporarily if this has
+ been the only instruction in this function segment.
+ This violates the invariant but will be remedied shortly by
+ btrace_compute_ftrace when we add the new trace. */
+
+ /* The only case where this would hurt is if the entire trace consisted
+ of just that one instruction. If we remove it, we might turn the now
+ empty btrace function segment into a gap. But we don't want gaps at
+ the beginning. To avoid this, we remove the entire old trace. */
+ if (last_bfun->number == 1 && last_bfun->insn.empty ())
+ btrace_clear (tp);
+
+ return 0;
+}
+
+/* Adjust the block trace in order to stitch old and new trace together.
+ BTRACE is the new delta trace between the last and the current stop.
+ TP is the traced thread.
+ May modifx BTRACE as well as the existing trace in TP.
+ Return 0 on success, -1 otherwise. */
+
+static int
+btrace_stitch_trace (struct btrace_data *btrace, struct thread_info *tp)
+{
+ /* If we don't have trace, there's nothing to do. */
+ if (btrace_data_empty (btrace))
+ return 0;
+
+ switch (btrace->format)
+ {
+ case BTRACE_FORMAT_NONE:
+ return 0;
+
+ case BTRACE_FORMAT_BTS:
+ return btrace_stitch_bts (&btrace->variant.bts, tp);
+
+ case BTRACE_FORMAT_PT:
+ /* Delta reads are not supported. */
+ return -1;
+ }
+
+ internal_error (__FILE__, __LINE__, _("Unkown branch trace format."));
+}
+
+/* Clear the branch trace histories in BTINFO. */
+
+static void
+btrace_clear_history (struct btrace_thread_info *btinfo)
+{
+ xfree (btinfo->insn_history);
+ xfree (btinfo->call_history);
+ xfree (btinfo->replay);
+
+ btinfo->insn_history = NULL;
+ btinfo->call_history = NULL;
+ btinfo->replay = NULL;
+}
+
+/* Clear the branch trace maintenance histories in BTINFO. */
+
+static void
+btrace_maint_clear (struct btrace_thread_info *btinfo)
+{
+ switch (btinfo->data.format)
+ {
+ default:
+ break;
+
+ case BTRACE_FORMAT_BTS:
+ btinfo->maint.variant.bts.packet_history.begin = 0;
+ btinfo->maint.variant.bts.packet_history.end = 0;
+ break;
+
+#if defined (HAVE_LIBIPT)
+ case BTRACE_FORMAT_PT:
+ xfree (btinfo->maint.variant.pt.packets);
+
+ btinfo->maint.variant.pt.packets = NULL;
+ btinfo->maint.variant.pt.packet_history.begin = 0;
+ btinfo->maint.variant.pt.packet_history.end = 0;
+ break;
+#endif /* defined (HAVE_LIBIPT) */
+ }
+}
+
+/* See btrace.h. */
+
+const char *
+btrace_decode_error (enum btrace_format format, int errcode)
+{
+ switch (format)
+ {
+ case BTRACE_FORMAT_BTS:
+ switch (errcode)
+ {
+ case BDE_BTS_OVERFLOW:
+ return _("instruction overflow");
+
+ case BDE_BTS_INSN_SIZE:
+ return _("unknown instruction");
+
+ default:
+ break;
+ }
+ break;
+
+#if defined (HAVE_LIBIPT)
+ case BTRACE_FORMAT_PT:
+ switch (errcode)
+ {
+ case BDE_PT_USER_QUIT:
+ return _("trace decode cancelled");
+
+ case BDE_PT_DISABLED:
+ return _("disabled");
+
+ case BDE_PT_OVERFLOW:
+ return _("overflow");
+
+ default:
+ if (errcode < 0)
+ return pt_errstr (pt_errcode (errcode));
+ break;
+ }
+ break;
+#endif /* defined (HAVE_LIBIPT) */
+
+ default:
+ break;
+ }
+
+ return _("unknown");
+}
+
+/* See btrace.h. */
+
+void
+btrace_fetch (struct thread_info *tp, const struct btrace_cpu *cpu)
+{
+ struct btrace_thread_info *btinfo;
+ struct btrace_target_info *tinfo;
+ struct btrace_data btrace;
+ struct cleanup *cleanup;
+ int errcode;
+
+ DEBUG ("fetch thread %s (%s)", print_thread_id (tp),
+ target_pid_to_str (tp->ptid));
+
+ btinfo = &tp->btrace;
+ tinfo = btinfo->target;
+ if (tinfo == NULL)
+ return;
+
+ /* There's no way we could get new trace while replaying.
+ On the other hand, delta trace would return a partial record with the
+ current PC, which is the replay PC, not the last PC, as expected. */
+ if (btinfo->replay != NULL)
+ return;
+
+ /* With CLI usage, TP->PTID always equals INFERIOR_PTID here. Now that we
+ can store a gdb.Record object in Python referring to a different thread
+ than the current one, temporarily set INFERIOR_PTID. */
+ scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
+ inferior_ptid = tp->ptid;
+
+ /* We should not be called on running or exited threads. */
+ gdb_assert (can_access_registers_ptid (tp->ptid));
+
+ btrace_data_init (&btrace);
+ cleanup = make_cleanup_btrace_data (&btrace);
+
+ /* Let's first try to extend the trace we already have. */
+ if (!btinfo->functions.empty ())
+ {
+ errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_DELTA);
+ if (errcode == 0)
+ {
+ /* Success. Let's try to stitch the traces together. */
+ errcode = btrace_stitch_trace (&btrace, tp);
+ }
+ else
+ {
+ /* We failed to read delta trace. Let's try to read new trace. */
+ errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_NEW);
+
+ /* If we got any new trace, discard what we have. */
+ if (errcode == 0 && !btrace_data_empty (&btrace))
+ btrace_clear (tp);
+ }
+
+ /* If we were not able to read the trace, we start over. */
+ if (errcode != 0)
+ {
+ btrace_clear (tp);
+ errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL);
+ }
+ }
+ else
+ errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL);
+
+ /* If we were not able to read the branch trace, signal an error. */
+ if (errcode != 0)
+ error (_("Failed to read branch trace."));
+
+ /* Compute the trace, provided we have any. */
+ if (!btrace_data_empty (&btrace))
+ {
+ /* Store the raw trace data. The stored data will be cleared in
+ btrace_clear, so we always append the new trace. */
+ btrace_data_append (&btinfo->data, &btrace);
+ btrace_maint_clear (btinfo);
+
+ btrace_clear_history (btinfo);
+ btrace_compute_ftrace (tp, &btrace, cpu);
+ }
+
+ do_cleanups (cleanup);
+}
+
+/* See btrace.h. */
+
+void
+btrace_clear (struct thread_info *tp)
+{
+ struct btrace_thread_info *btinfo;
+
+ DEBUG ("clear thread %s (%s)", print_thread_id (tp),
+ target_pid_to_str (tp->ptid));
+
+ /* Make sure btrace frames that may hold a pointer into the branch
+ trace data are destroyed. */
+ reinit_frame_cache ();
+
+ btinfo = &tp->btrace;
+
+ btinfo->functions.clear ();
+ btinfo->ngaps = 0;
+
+ /* Must clear the maint data before - it depends on BTINFO->DATA. */
+ btrace_maint_clear (btinfo);
+ btrace_data_clear (&btinfo->data);
+ btrace_clear_history (btinfo);
+}
+
+/* See btrace.h. */
+
+void
+btrace_free_objfile (struct objfile *objfile)
+{
+ struct thread_info *tp;
+
+ DEBUG ("free objfile");
+
+ ALL_NON_EXITED_THREADS (tp)
+ btrace_clear (tp);
+}
+
+#if defined (HAVE_LIBEXPAT)
+
+/* Check the btrace document version. */
+
+static void
+check_xml_btrace_version (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data,
+ std::vector<gdb_xml_value> &attributes)
+{
+ const char *version
+ = (const char *) xml_find_attribute (attributes, "version")->value.get ();
+
+ if (strcmp (version, "1.0") != 0)
+ gdb_xml_error (parser, _("Unsupported btrace version: \"%s\""), version);
+}
+
+/* Parse a btrace "block" xml record. */
+
+static void
+parse_xml_btrace_block (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data,
+ std::vector<gdb_xml_value> &attributes)
+{
+ struct btrace_data *btrace;
+ struct btrace_block *block;
+ ULONGEST *begin, *end;
+
+ btrace = (struct btrace_data *) user_data;
+
+ switch (btrace->format)
+ {
+ case BTRACE_FORMAT_BTS:
+ break;
+
+ case BTRACE_FORMAT_NONE:
+ btrace->format = BTRACE_FORMAT_BTS;
+ btrace->variant.bts.blocks = NULL;
+ break;
+
+ default:
+ gdb_xml_error (parser, _("Btrace format error."));
+ }
+
+ begin = (ULONGEST *) xml_find_attribute (attributes, "begin")->value.get ();
+ end = (ULONGEST *) xml_find_attribute (attributes, "end")->value.get ();
+
+ block = VEC_safe_push (btrace_block_s, btrace->variant.bts.blocks, NULL);
+ block->begin = *begin;
+ block->end = *end;
+}
+
+/* Parse a "raw" xml record. */
+
+static void
+parse_xml_raw (struct gdb_xml_parser *parser, const char *body_text,
+ gdb_byte **pdata, size_t *psize)
+{
+ struct cleanup *cleanup;
+ gdb_byte *data, *bin;
+ size_t len, size;
+
+ len = strlen (body_text);
+ if (len % 2 != 0)
+ gdb_xml_error (parser, _("Bad raw data size."));
+
+ size = len / 2;
+
+ bin = data = (gdb_byte *) xmalloc (size);
+ cleanup = make_cleanup (xfree, data);
+
+ /* We use hex encoding - see common/rsp-low.h. */
+ while (len > 0)
+ {
+ char hi, lo;
+
+ hi = *body_text++;
+ lo = *body_text++;
+
+ if (hi == 0 || lo == 0)
+ gdb_xml_error (parser, _("Bad hex encoding."));
+
+ *bin++ = fromhex (hi) * 16 + fromhex (lo);
+ len -= 2;
+ }
+
+ discard_cleanups (cleanup);
+
+ *pdata = data;
+ *psize = size;
+}
+
+/* Parse a btrace pt-config "cpu" xml record. */
+
+static void
+parse_xml_btrace_pt_config_cpu (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data,
+ std::vector<gdb_xml_value> &attributes)
+{
+ struct btrace_data *btrace;
+ const char *vendor;
+ ULONGEST *family, *model, *stepping;
+
+ vendor =
+ (const char *) xml_find_attribute (attributes, "vendor")->value.get ();
+ family
+ = (ULONGEST *) xml_find_attribute (attributes, "family")->value.get ();
+ model
+ = (ULONGEST *) xml_find_attribute (attributes, "model")->value.get ();
+ stepping
+ = (ULONGEST *) xml_find_attribute (attributes, "stepping")->value.get ();
+
+ btrace = (struct btrace_data *) user_data;
+
+ if (strcmp (vendor, "GenuineIntel") == 0)
+ btrace->variant.pt.config.cpu.vendor = CV_INTEL;
+
+ btrace->variant.pt.config.cpu.family = *family;
+ btrace->variant.pt.config.cpu.model = *model;
+ btrace->variant.pt.config.cpu.stepping = *stepping;
+}
+
+/* Parse a btrace pt "raw" xml record. */
+
+static void
+parse_xml_btrace_pt_raw (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data, const char *body_text)
+{
+ struct btrace_data *btrace;
+
+ btrace = (struct btrace_data *) user_data;
+ parse_xml_raw (parser, body_text, &btrace->variant.pt.data,
+ &btrace->variant.pt.size);
+}
+
+/* Parse a btrace "pt" xml record. */
+
+static void
+parse_xml_btrace_pt (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data,
+ std::vector<gdb_xml_value> &attributes)
+{
+ struct btrace_data *btrace;
+
+ btrace = (struct btrace_data *) user_data;
+ btrace->format = BTRACE_FORMAT_PT;
+ btrace->variant.pt.config.cpu.vendor = CV_UNKNOWN;
+ btrace->variant.pt.data = NULL;
+ btrace->variant.pt.size = 0;
+}
+
+static const struct gdb_xml_attribute block_attributes[] = {
+ { "begin", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
+ { "end", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_attribute btrace_pt_config_cpu_attributes[] = {
+ { "vendor", GDB_XML_AF_NONE, NULL, NULL },
+ { "family", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
+ { "model", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
+ { "stepping", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_element btrace_pt_config_children[] = {
+ { "cpu", btrace_pt_config_cpu_attributes, NULL, GDB_XML_EF_OPTIONAL,
+ parse_xml_btrace_pt_config_cpu, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_element btrace_pt_children[] = {
+ { "pt-config", NULL, btrace_pt_config_children, GDB_XML_EF_OPTIONAL, NULL,
+ NULL },
+ { "raw", NULL, NULL, GDB_XML_EF_OPTIONAL, NULL, parse_xml_btrace_pt_raw },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_attribute btrace_attributes[] = {
+ { "version", GDB_XML_AF_NONE, NULL, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_element btrace_children[] = {
+ { "block", block_attributes, NULL,
+ GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, parse_xml_btrace_block, NULL },
+ { "pt", NULL, btrace_pt_children, GDB_XML_EF_OPTIONAL, parse_xml_btrace_pt,
+ NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_element btrace_elements[] = {
+ { "btrace", btrace_attributes, btrace_children, GDB_XML_EF_NONE,
+ check_xml_btrace_version, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+#endif /* defined (HAVE_LIBEXPAT) */
+
+/* See btrace.h. */
+
+void
+parse_xml_btrace (struct btrace_data *btrace, const char *buffer)
+{
+ struct cleanup *cleanup;
+ int errcode;
+
+#if defined (HAVE_LIBEXPAT)
+
+ btrace->format = BTRACE_FORMAT_NONE;
+
+ cleanup = make_cleanup_btrace_data (btrace);
+ errcode = gdb_xml_parse_quick (_("btrace"), "btrace.dtd", btrace_elements,
+ buffer, btrace);
+ if (errcode != 0)
+ error (_("Error parsing branch trace."));
+
+ /* Keep parse results. */
+ discard_cleanups (cleanup);
+
+#else /* !defined (HAVE_LIBEXPAT) */
+
+ error (_("Cannot process branch trace. XML support was disabled at "
+ "compile time."));
+
+#endif /* !defined (HAVE_LIBEXPAT) */
+}
+
+#if defined (HAVE_LIBEXPAT)
+
+/* Parse a btrace-conf "bts" xml record. */
+
+static void
+parse_xml_btrace_conf_bts (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data,
+ std::vector<gdb_xml_value> &attributes)
+{
+ struct btrace_config *conf;
+ struct gdb_xml_value *size;
+
+ conf = (struct btrace_config *) user_data;
+ conf->format = BTRACE_FORMAT_BTS;
+ conf->bts.size = 0;
+
+ size = xml_find_attribute (attributes, "size");
+ if (size != NULL)
+ conf->bts.size = (unsigned int) *(ULONGEST *) size->value.get ();
+}
+
+/* Parse a btrace-conf "pt" xml record. */
+
+static void
+parse_xml_btrace_conf_pt (struct gdb_xml_parser *parser,
+ const struct gdb_xml_element *element,
+ void *user_data,
+ std::vector<gdb_xml_value> &attributes)
+{
+ struct btrace_config *conf;
+ struct gdb_xml_value *size;
+
+ conf = (struct btrace_config *) user_data;
+ conf->format = BTRACE_FORMAT_PT;
+ conf->pt.size = 0;
+
+ size = xml_find_attribute (attributes, "size");
+ if (size != NULL)
+ conf->pt.size = (unsigned int) *(ULONGEST *) size->value.get ();
+}
+
+static const struct gdb_xml_attribute btrace_conf_pt_attributes[] = {
+ { "size", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_attribute btrace_conf_bts_attributes[] = {
+ { "size", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_element btrace_conf_children[] = {
+ { "bts", btrace_conf_bts_attributes, NULL, GDB_XML_EF_OPTIONAL,
+ parse_xml_btrace_conf_bts, NULL },
+ { "pt", btrace_conf_pt_attributes, NULL, GDB_XML_EF_OPTIONAL,
+ parse_xml_btrace_conf_pt, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_attribute btrace_conf_attributes[] = {
+ { "version", GDB_XML_AF_NONE, NULL, NULL },
+ { NULL, GDB_XML_AF_NONE, NULL, NULL }
+};
+
+static const struct gdb_xml_element btrace_conf_elements[] = {
+ { "btrace-conf", btrace_conf_attributes, btrace_conf_children,
+ GDB_XML_EF_NONE, NULL, NULL },
+ { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
+};
+
+#endif /* defined (HAVE_LIBEXPAT) */
+
+/* See btrace.h. */
+
+void
+parse_xml_btrace_conf (struct btrace_config *conf, const char *xml)
+{
+ int errcode;
+
+#if defined (HAVE_LIBEXPAT)
+
+ errcode = gdb_xml_parse_quick (_("btrace-conf"), "btrace-conf.dtd",
+ btrace_conf_elements, xml, conf);
+ if (errcode != 0)
+ error (_("Error parsing branch trace configuration."));
#else /* !defined (HAVE_LIBEXPAT) */
- error (_("Cannot process branch trace. XML parsing is not supported."));
+ error (_("Cannot process the branch trace configuration. XML support "
+ "was disabled at compile time."));
+
+#endif /* !defined (HAVE_LIBEXPAT) */
+}
+
+/* See btrace.h. */
+
+const struct btrace_insn *
+btrace_insn_get (const struct btrace_insn_iterator *it)
+{
+ const struct btrace_function *bfun;
+ unsigned int index, end;
+
+ index = it->insn_index;
+ bfun = &it->btinfo->functions[it->call_index];
+
+ /* Check if the iterator points to a gap in the trace. */
+ if (bfun->errcode != 0)
+ return NULL;
+
+ /* The index is within the bounds of this function's instruction vector. */
+ end = bfun->insn.size ();
+ gdb_assert (0 < end);
+ gdb_assert (index < end);
+
+ return &bfun->insn[index];
+}
+
+/* See btrace.h. */
+
+int
+btrace_insn_get_error (const struct btrace_insn_iterator *it)
+{
+ return it->btinfo->functions[it->call_index].errcode;
+}
+
+/* See btrace.h. */
+
+unsigned int
+btrace_insn_number (const struct btrace_insn_iterator *it)
+{
+ return it->btinfo->functions[it->call_index].insn_offset + it->insn_index;
+}
+
+/* See btrace.h. */
+
+void
+btrace_insn_begin (struct btrace_insn_iterator *it,
+ const struct btrace_thread_info *btinfo)
+{
+ if (btinfo->functions.empty ())
+ error (_("No trace."));
+
+ it->btinfo = btinfo;
+ it->call_index = 0;
+ it->insn_index = 0;
+}
+
+/* See btrace.h. */
+
+void
+btrace_insn_end (struct btrace_insn_iterator *it,
+ const struct btrace_thread_info *btinfo)
+{
+ const struct btrace_function *bfun;
+ unsigned int length;
+
+ if (btinfo->functions.empty ())
+ error (_("No trace."));
+
+ bfun = &btinfo->functions.back ();
+ length = bfun->insn.size ();
+
+ /* The last function may either be a gap or it contains the current
+ instruction, which is one past the end of the execution trace; ignore
+ it. */
+ if (length > 0)
+ length -= 1;
+
+ it->btinfo = btinfo;
+ it->call_index = bfun->number - 1;
+ it->insn_index = length;
+}
+
+/* See btrace.h. */
+
+unsigned int
+btrace_insn_next (struct btrace_insn_iterator *it, unsigned int stride)
+{
+ const struct btrace_function *bfun;
+ unsigned int index, steps;
+
+ bfun = &it->btinfo->functions[it->call_index];
+ steps = 0;
+ index = it->insn_index;
+
+ while (stride != 0)
+ {
+ unsigned int end, space, adv;
+
+ end = bfun->insn.size ();
+
+ /* An empty function segment represents a gap in the trace. We count
+ it as one instruction. */
+ if (end == 0)
+ {
+ const struct btrace_function *next;
+
+ next = ftrace_find_call_by_number (it->btinfo, bfun->number + 1);
+ if (next == NULL)
+ break;
+
+ stride -= 1;
+ steps += 1;
+
+ bfun = next;
+ index = 0;
+
+ continue;
+ }
+
+ gdb_assert (0 < end);
+ gdb_assert (index < end);
+
+ /* Compute the number of instructions remaining in this segment. */
+ space = end - index;
+
+ /* Advance the iterator as far as possible within this segment. */
+ adv = std::min (space, stride);
+ stride -= adv;
+ index += adv;
+ steps += adv;
+
+ /* Move to the next function if we're at the end of this one. */
+ if (index == end)
+ {
+ const struct btrace_function *next;
+
+ next = ftrace_find_call_by_number (it->btinfo, bfun->number + 1);
+ if (next == NULL)
+ {
+ /* We stepped past the last function.
+
+ Let's adjust the index to point to the last instruction in
+ the previous function. */
+ index -= 1;
+ steps -= 1;
+ break;
+ }
+
+ /* We now point to the first instruction in the new function. */
+ bfun = next;
+ index = 0;
+ }
+
+ /* We did make progress. */
+ gdb_assert (adv > 0);
+ }
+
+ /* Update the iterator. */
+ it->call_index = bfun->number - 1;
+ it->insn_index = index;
+
+ return steps;
+}
+
+/* See btrace.h. */
+
+unsigned int
+btrace_insn_prev (struct btrace_insn_iterator *it, unsigned int stride)
+{
+ const struct btrace_function *bfun;
+ unsigned int index, steps;
+
+ bfun = &it->btinfo->functions[it->call_index];
+ steps = 0;
+ index = it->insn_index;
+
+ while (stride != 0)
+ {
+ unsigned int adv;
+
+ /* Move to the previous function if we're at the start of this one. */
+ if (index == 0)
+ {
+ const struct btrace_function *prev;
+
+ prev = ftrace_find_call_by_number (it->btinfo, bfun->number - 1);
+ if (prev == NULL)
+ break;
+
+ /* We point to one after the last instruction in the new function. */
+ bfun = prev;
+ index = bfun->insn.size ();
+
+ /* An empty function segment represents a gap in the trace. We count
+ it as one instruction. */
+ if (index == 0)
+ {
+ stride -= 1;
+ steps += 1;
+
+ continue;
+ }
+ }
+
+ /* Advance the iterator as far as possible within this segment. */
+ adv = std::min (index, stride);
+
+ stride -= adv;
+ index -= adv;
+ steps += adv;
+
+ /* We did make progress. */
+ gdb_assert (adv > 0);
+ }
+
+ /* Update the iterator. */
+ it->call_index = bfun->number - 1;
+ it->insn_index = index;
+
+ return steps;
+}
+
+/* See btrace.h. */
+
+int
+btrace_insn_cmp (const struct btrace_insn_iterator *lhs,
+ const struct btrace_insn_iterator *rhs)
+{
+ gdb_assert (lhs->btinfo == rhs->btinfo);
+
+ if (lhs->call_index != rhs->call_index)
+ return lhs->call_index - rhs->call_index;
+
+ return lhs->insn_index - rhs->insn_index;
+}
+
+/* See btrace.h. */
+
+int
+btrace_find_insn_by_number (struct btrace_insn_iterator *it,
+ const struct btrace_thread_info *btinfo,
+ unsigned int number)
+{
+ const struct btrace_function *bfun;
+ unsigned int upper, lower;
+
+ if (btinfo->functions.empty ())
+ return 0;
+
+ lower = 0;
+ bfun = &btinfo->functions[lower];
+ if (number < bfun->insn_offset)
+ return 0;
+
+ upper = btinfo->functions.size () - 1;
+ bfun = &btinfo->functions[upper];
+ if (number >= bfun->insn_offset + ftrace_call_num_insn (bfun))
+ return 0;
+
+ /* We assume that there are no holes in the numbering. */
+ for (;;)
+ {
+ const unsigned int average = lower + (upper - lower) / 2;
+
+ bfun = &btinfo->functions[average];
+
+ if (number < bfun->insn_offset)
+ {
+ upper = average - 1;
+ continue;
+ }
+
+ if (number >= bfun->insn_offset + ftrace_call_num_insn (bfun))
+ {
+ lower = average + 1;
+ continue;
+ }
+
+ break;
+ }
+
+ it->btinfo = btinfo;
+ it->call_index = bfun->number - 1;
+ it->insn_index = number - bfun->insn_offset;
+ return 1;
+}
+
+/* Returns true if the recording ends with a function segment that
+ contains only a single (i.e. the current) instruction. */
+
+static bool
+btrace_ends_with_single_insn (const struct btrace_thread_info *btinfo)
+{
+ const btrace_function *bfun;
+
+ if (btinfo->functions.empty ())
+ return false;
+
+ bfun = &btinfo->functions.back ();
+ if (bfun->errcode != 0)
+ return false;
+
+ return ftrace_call_num_insn (bfun) == 1;
+}
+
+/* See btrace.h. */
+
+const struct btrace_function *
+btrace_call_get (const struct btrace_call_iterator *it)
+{
+ if (it->index >= it->btinfo->functions.size ())
+ return NULL;
+
+ return &it->btinfo->functions[it->index];
+}
+
+/* See btrace.h. */
+
+unsigned int
+btrace_call_number (const struct btrace_call_iterator *it)
+{
+ const unsigned int length = it->btinfo->functions.size ();
+
+ /* If the last function segment contains only a single instruction (i.e. the
+ current instruction), skip it. */
+ if ((it->index == length) && btrace_ends_with_single_insn (it->btinfo))
+ return length;
+
+ return it->index + 1;
+}
+
+/* See btrace.h. */
+
+void
+btrace_call_begin (struct btrace_call_iterator *it,
+ const struct btrace_thread_info *btinfo)
+{
+ if (btinfo->functions.empty ())
+ error (_("No trace."));
+
+ it->btinfo = btinfo;
+ it->index = 0;
+}
+
+/* See btrace.h. */
+
+void
+btrace_call_end (struct btrace_call_iterator *it,
+ const struct btrace_thread_info *btinfo)
+{
+ if (btinfo->functions.empty ())
+ error (_("No trace."));
+
+ it->btinfo = btinfo;
+ it->index = btinfo->functions.size ();
+}
+
+/* See btrace.h. */
+
+unsigned int
+btrace_call_next (struct btrace_call_iterator *it, unsigned int stride)
+{
+ const unsigned int length = it->btinfo->functions.size ();
+
+ if (it->index + stride < length - 1)
+ /* Default case: Simply advance the iterator. */
+ it->index += stride;
+ else if (it->index + stride == length - 1)
+ {
+ /* We land exactly at the last function segment. If it contains only one
+ instruction (i.e. the current instruction) it is not actually part of
+ the trace. */
+ if (btrace_ends_with_single_insn (it->btinfo))
+ it->index = length;
+ else
+ it->index = length - 1;
+ }
+ else
+ {
+ /* We land past the last function segment and have to adjust the stride.
+ If the last function segment contains only one instruction (i.e. the
+ current instruction) it is not actually part of the trace. */
+ if (btrace_ends_with_single_insn (it->btinfo))
+ stride = length - it->index - 1;
+ else
+ stride = length - it->index;
+
+ it->index = length;
+ }
+
+ return stride;
+}
+
+/* See btrace.h. */
+
+unsigned int
+btrace_call_prev (struct btrace_call_iterator *it, unsigned int stride)
+{
+ const unsigned int length = it->btinfo->functions.size ();
+ int steps = 0;
+
+ gdb_assert (it->index <= length);
+
+ if (stride == 0 || it->index == 0)
+ return 0;
+
+ /* If we are at the end, the first step is a special case. If the last
+ function segment contains only one instruction (i.e. the current
+ instruction) it is not actually part of the trace. To be able to step
+ over this instruction, we need at least one more function segment. */
+ if ((it->index == length) && (length > 1))
+ {
+ if (btrace_ends_with_single_insn (it->btinfo))
+ it->index = length - 2;
+ else
+ it->index = length - 1;
+
+ steps = 1;
+ stride -= 1;
+ }
+
+ stride = std::min (stride, it->index);
+
+ it->index -= stride;
+ return steps + stride;
+}
+
+/* See btrace.h. */
+
+int
+btrace_call_cmp (const struct btrace_call_iterator *lhs,
+ const struct btrace_call_iterator *rhs)
+{
+ gdb_assert (lhs->btinfo == rhs->btinfo);
+ return (int) (lhs->index - rhs->index);
+}
+
+/* See btrace.h. */
+
+int
+btrace_find_call_by_number (struct btrace_call_iterator *it,
+ const struct btrace_thread_info *btinfo,
+ unsigned int number)
+{
+ const unsigned int length = btinfo->functions.size ();
+
+ if ((number == 0) || (number > length))
+ return 0;
+
+ it->btinfo = btinfo;
+ it->index = number - 1;
+ return 1;
+}
+
+/* See btrace.h. */
+
+void
+btrace_set_insn_history (struct btrace_thread_info *btinfo,
+ const struct btrace_insn_iterator *begin,
+ const struct btrace_insn_iterator *end)
+{
+ if (btinfo->insn_history == NULL)
+ btinfo->insn_history = XCNEW (struct btrace_insn_history);
-#endif /* !defined (HAVE_LIBEXPAT) */
+ btinfo->insn_history->begin = *begin;
+ btinfo->insn_history->end = *end;
+}
+
+/* See btrace.h. */
+
+void
+btrace_set_call_history (struct btrace_thread_info *btinfo,
+ const struct btrace_call_iterator *begin,
+ const struct btrace_call_iterator *end)
+{
+ gdb_assert (begin->btinfo == end->btinfo);
+
+ if (btinfo->call_history == NULL)
+ btinfo->call_history = XCNEW (struct btrace_call_history);
+
+ btinfo->call_history->begin = *begin;
+ btinfo->call_history->end = *end;
+}
+
+/* See btrace.h. */
+
+int
+btrace_is_replaying (struct thread_info *tp)
+{
+ return tp->btrace.replay != NULL;
+}
+
+/* See btrace.h. */
+
+int
+btrace_is_empty (struct thread_info *tp)
+{
+ struct btrace_insn_iterator begin, end;
+ struct btrace_thread_info *btinfo;
+
+ btinfo = &tp->btrace;
+
+ if (btinfo->functions.empty ())
+ return 1;
+
+ btrace_insn_begin (&begin, btinfo);
+ btrace_insn_end (&end, btinfo);
+
+ return btrace_insn_cmp (&begin, &end) == 0;
+}
+
+/* Forward the cleanup request. */
+
+static void
+do_btrace_data_cleanup (void *arg)
+{
+ btrace_data_fini ((struct btrace_data *) arg);
+}
+
+/* See btrace.h. */
+
+struct cleanup *
+make_cleanup_btrace_data (struct btrace_data *data)
+{
+ return make_cleanup (do_btrace_data_cleanup, data);
+}
+
+#if defined (HAVE_LIBIPT)
+
+/* Print a single packet. */
+
+static void
+pt_print_packet (const struct pt_packet *packet)
+{
+ switch (packet->type)
+ {
+ default:
+ printf_unfiltered (("[??: %x]"), packet->type);
+ break;
+
+ case ppt_psb:
+ printf_unfiltered (("psb"));
+ break;
+
+ case ppt_psbend:
+ printf_unfiltered (("psbend"));
+ break;
+
+ case ppt_pad:
+ printf_unfiltered (("pad"));
+ break;
+
+ case ppt_tip:
+ printf_unfiltered (("tip %u: 0x%" PRIx64 ""),
+ packet->payload.ip.ipc,
+ packet->payload.ip.ip);
+ break;
+
+ case ppt_tip_pge:
+ printf_unfiltered (("tip.pge %u: 0x%" PRIx64 ""),
+ packet->payload.ip.ipc,
+ packet->payload.ip.ip);
+ break;
+
+ case ppt_tip_pgd:
+ printf_unfiltered (("tip.pgd %u: 0x%" PRIx64 ""),
+ packet->payload.ip.ipc,
+ packet->payload.ip.ip);
+ break;
+
+ case ppt_fup:
+ printf_unfiltered (("fup %u: 0x%" PRIx64 ""),
+ packet->payload.ip.ipc,
+ packet->payload.ip.ip);
+ break;
+
+ case ppt_tnt_8:
+ printf_unfiltered (("tnt-8 %u: 0x%" PRIx64 ""),
+ packet->payload.tnt.bit_size,
+ packet->payload.tnt.payload);
+ break;
+
+ case ppt_tnt_64:
+ printf_unfiltered (("tnt-64 %u: 0x%" PRIx64 ""),
+ packet->payload.tnt.bit_size,
+ packet->payload.tnt.payload);
+ break;
+
+ case ppt_pip:
+ printf_unfiltered (("pip %" PRIx64 "%s"), packet->payload.pip.cr3,
+ packet->payload.pip.nr ? (" nr") : (""));
+ break;
+
+ case ppt_tsc:
+ printf_unfiltered (("tsc %" PRIx64 ""), packet->payload.tsc.tsc);
+ break;
+
+ case ppt_cbr:
+ printf_unfiltered (("cbr %u"), packet->payload.cbr.ratio);
+ break;
+
+ case ppt_mode:
+ switch (packet->payload.mode.leaf)
+ {
+ default:
+ printf_unfiltered (("mode %u"), packet->payload.mode.leaf);
+ break;
+
+ case pt_mol_exec:
+ printf_unfiltered (("mode.exec%s%s"),
+ packet->payload.mode.bits.exec.csl
+ ? (" cs.l") : (""),
+ packet->payload.mode.bits.exec.csd
+ ? (" cs.d") : (""));
+ break;
+
+ case pt_mol_tsx:
+ printf_unfiltered (("mode.tsx%s%s"),
+ packet->payload.mode.bits.tsx.intx
+ ? (" intx") : (""),
+ packet->payload.mode.bits.tsx.abrt
+ ? (" abrt") : (""));
+ break;
+ }
+ break;
+
+ case ppt_ovf:
+ printf_unfiltered (("ovf"));
+ break;
+
+ case ppt_stop:
+ printf_unfiltered (("stop"));
+ break;
+
+ case ppt_vmcs:
+ printf_unfiltered (("vmcs %" PRIx64 ""), packet->payload.vmcs.base);
+ break;
+
+ case ppt_tma:
+ printf_unfiltered (("tma %x %x"), packet->payload.tma.ctc,
+ packet->payload.tma.fc);
+ break;
+
+ case ppt_mtc:
+ printf_unfiltered (("mtc %x"), packet->payload.mtc.ctc);
+ break;
+
+ case ppt_cyc:
+ printf_unfiltered (("cyc %" PRIx64 ""), packet->payload.cyc.value);
+ break;
+
+ case ppt_mnt:
+ printf_unfiltered (("mnt %" PRIx64 ""), packet->payload.mnt.payload);
+ break;
+ }
+}
+
+/* Decode packets into MAINT using DECODER. */
+
+static void
+btrace_maint_decode_pt (struct btrace_maint_info *maint,
+ struct pt_packet_decoder *decoder)
+{
+ int errcode;
+
+ for (;;)
+ {
+ struct btrace_pt_packet packet;
+
+ errcode = pt_pkt_sync_forward (decoder);
+ if (errcode < 0)
+ break;
+
+ for (;;)
+ {
+ pt_pkt_get_offset (decoder, &packet.offset);
+
+ errcode = pt_pkt_next (decoder, &packet.packet,
+ sizeof(packet.packet));
+ if (errcode < 0)
+ break;
+
+ if (maint_btrace_pt_skip_pad == 0 || packet.packet.type != ppt_pad)
+ {
+ packet.errcode = pt_errcode (errcode);
+ VEC_safe_push (btrace_pt_packet_s, maint->variant.pt.packets,
+ &packet);
+ }
+ }
+
+ if (errcode == -pte_eos)
+ break;
+
+ packet.errcode = pt_errcode (errcode);
+ VEC_safe_push (btrace_pt_packet_s, maint->variant.pt.packets,
+ &packet);
+
+ warning (_("Error at trace offset 0x%" PRIx64 ": %s."),
+ packet.offset, pt_errstr (packet.errcode));
+ }
+
+ if (errcode != -pte_eos)
+ warning (_("Failed to synchronize onto the Intel Processor Trace "
+ "stream: %s."), pt_errstr (pt_errcode (errcode)));
+}
+
+/* Update the packet history in BTINFO. */
+
+static void
+btrace_maint_update_pt_packets (struct btrace_thread_info *btinfo)
+{
+ struct pt_packet_decoder *decoder;
+ const struct btrace_cpu *cpu;
+ struct btrace_data_pt *pt;
+ struct pt_config config;
+ int errcode;
+
+ pt = &btinfo->data.variant.pt;
+
+ /* Nothing to do if there is no trace. */
+ if (pt->size == 0)
+ return;
+
+ memset (&config, 0, sizeof(config));
+
+ config.size = sizeof (config);
+ config.begin = pt->data;
+ config.end = pt->data + pt->size;
+
+ cpu = record_btrace_get_cpu ();
+ if (cpu == nullptr)
+ cpu = &pt->config.cpu;
+
+ /* We treat an unknown vendor as 'no errata'. */
+ if (cpu->vendor != CV_UNKNOWN)
+ {
+ config.cpu.vendor = pt_translate_cpu_vendor (cpu->vendor);
+ config.cpu.family = cpu->family;
+ config.cpu.model = cpu->model;
+ config.cpu.stepping = cpu->stepping;
+
+ errcode = pt_cpu_errata (&config.errata, &config.cpu);
+ if (errcode < 0)
+ error (_("Failed to configure the Intel Processor Trace "
+ "decoder: %s."), pt_errstr (pt_errcode (errcode)));
+ }
+
+ decoder = pt_pkt_alloc_decoder (&config);
+ if (decoder == NULL)
+ error (_("Failed to allocate the Intel Processor Trace decoder."));
+
+ TRY
+ {
+ btrace_maint_decode_pt (&btinfo->maint, decoder);
+ }
+ CATCH (except, RETURN_MASK_ALL)
+ {
+ pt_pkt_free_decoder (decoder);
+
+ if (except.reason < 0)
+ throw_exception (except);
+ }
+ END_CATCH
+
+ pt_pkt_free_decoder (decoder);
+}
+
+#endif /* !defined (HAVE_LIBIPT) */
+
+/* Update the packet maintenance information for BTINFO and store the
+ low and high bounds into BEGIN and END, respectively.
+ Store the current iterator state into FROM and TO. */
+
+static void
+btrace_maint_update_packets (struct btrace_thread_info *btinfo,
+ unsigned int *begin, unsigned int *end,
+ unsigned int *from, unsigned int *to)
+{
+ switch (btinfo->data.format)
+ {
+ default:
+ *begin = 0;
+ *end = 0;
+ *from = 0;
+ *to = 0;
+ break;
+
+ case BTRACE_FORMAT_BTS:
+ /* Nothing to do - we operate directly on BTINFO->DATA. */
+ *begin = 0;
+ *end = VEC_length (btrace_block_s, btinfo->data.variant.bts.blocks);
+ *from = btinfo->maint.variant.bts.packet_history.begin;
+ *to = btinfo->maint.variant.bts.packet_history.end;
+ break;
+
+#if defined (HAVE_LIBIPT)
+ case BTRACE_FORMAT_PT:
+ if (VEC_empty (btrace_pt_packet_s, btinfo->maint.variant.pt.packets))
+ btrace_maint_update_pt_packets (btinfo);
+
+ *begin = 0;
+ *end = VEC_length (btrace_pt_packet_s, btinfo->maint.variant.pt.packets);
+ *from = btinfo->maint.variant.pt.packet_history.begin;
+ *to = btinfo->maint.variant.pt.packet_history.end;
+ break;
+#endif /* defined (HAVE_LIBIPT) */
+ }
+}
+
+/* Print packets in BTINFO from BEGIN (inclusive) until END (exclusive) and
+ update the current iterator position. */
+
+static void
+btrace_maint_print_packets (struct btrace_thread_info *btinfo,
+ unsigned int begin, unsigned int end)
+{
+ switch (btinfo->data.format)
+ {
+ default:
+ break;
+
+ case BTRACE_FORMAT_BTS:
+ {
+ VEC (btrace_block_s) *blocks;
+ unsigned int blk;
+
+ blocks = btinfo->data.variant.bts.blocks;
+ for (blk = begin; blk < end; ++blk)
+ {
+ const btrace_block_s *block;
+
+ block = VEC_index (btrace_block_s, blocks, blk);
+
+ printf_unfiltered ("%u\tbegin: %s, end: %s\n", blk,
+ core_addr_to_string_nz (block->begin),
+ core_addr_to_string_nz (block->end));
+ }
+
+ btinfo->maint.variant.bts.packet_history.begin = begin;
+ btinfo->maint.variant.bts.packet_history.end = end;
+ }
+ break;
+
+#if defined (HAVE_LIBIPT)
+ case BTRACE_FORMAT_PT:
+ {
+ VEC (btrace_pt_packet_s) *packets;
+ unsigned int pkt;
+
+ packets = btinfo->maint.variant.pt.packets;
+ for (pkt = begin; pkt < end; ++pkt)
+ {
+ const struct btrace_pt_packet *packet;
+
+ packet = VEC_index (btrace_pt_packet_s, packets, pkt);
+
+ printf_unfiltered ("%u\t", pkt);
+ printf_unfiltered ("0x%" PRIx64 "\t", packet->offset);
+
+ if (packet->errcode == pte_ok)
+ pt_print_packet (&packet->packet);
+ else
+ printf_unfiltered ("[error: %s]", pt_errstr (packet->errcode));
+
+ printf_unfiltered ("\n");
+ }
+
+ btinfo->maint.variant.pt.packet_history.begin = begin;
+ btinfo->maint.variant.pt.packet_history.end = end;
+ }
+ break;
+#endif /* defined (HAVE_LIBIPT) */
+ }
+}
+
+/* Read a number from an argument string. */
+
+static unsigned int
+get_uint (const char **arg)
+{
+ const char *begin, *pos;
+ char *end;
+ unsigned long number;
+
+ begin = *arg;
+ pos = skip_spaces (begin);
+
+ if (!isdigit (*pos))
+ error (_("Expected positive number, got: %s."), pos);
+
+ number = strtoul (pos, &end, 10);
+ if (number > UINT_MAX)
+ error (_("Number too big."));
+
+ *arg += (end - begin);
+
+ return (unsigned int) number;
+}
+
+/* Read a context size from an argument string. */
+
+static int
+get_context_size (const char **arg)
+{
+ const char *pos = skip_spaces (*arg);
+
+ if (!isdigit (*pos))
+ error (_("Expected positive number, got: %s."), pos);
+
+ char *end;
+ long result = strtol (pos, &end, 10);
+ *arg = end;
+ return result;
+}
+
+/* Complain about junk at the end of an argument string. */
+
+static void
+no_chunk (const char *arg)
+{
+ if (*arg != 0)
+ error (_("Junk after argument: %s."), arg);
+}
+
+/* The "maintenance btrace packet-history" command. */
+
+static void
+maint_btrace_packet_history_cmd (const char *arg, int from_tty)
+{
+ struct btrace_thread_info *btinfo;
+ struct thread_info *tp;
+ unsigned int size, begin, end, from, to;
+
+ tp = find_thread_ptid (inferior_ptid);
+ if (tp == NULL)
+ error (_("No thread."));
+
+ size = 10;
+ btinfo = &tp->btrace;
+
+ btrace_maint_update_packets (btinfo, &begin, &end, &from, &to);
+ if (begin == end)
+ {
+ printf_unfiltered (_("No trace.\n"));
+ return;
+ }
+
+ if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
+ {
+ from = to;
+
+ if (end - from < size)
+ size = end - from;
+ to = from + size;
+ }
+ else if (strcmp (arg, "-") == 0)
+ {
+ to = from;
+
+ if (to - begin < size)
+ size = to - begin;
+ from = to - size;
+ }
+ else
+ {
+ from = get_uint (&arg);
+ if (end <= from)
+ error (_("'%u' is out of range."), from);
+
+ arg = skip_spaces (arg);
+ if (*arg == ',')
+ {
+ arg = skip_spaces (++arg);
+
+ if (*arg == '+')
+ {
+ arg += 1;
+ size = get_context_size (&arg);
+
+ no_chunk (arg);
+
+ if (end - from < size)
+ size = end - from;
+ to = from + size;
+ }
+ else if (*arg == '-')
+ {
+ arg += 1;
+ size = get_context_size (&arg);
+
+ no_chunk (arg);
+
+ /* Include the packet given as first argument. */
+ from += 1;
+ to = from;
+
+ if (to - begin < size)
+ size = to - begin;
+ from = to - size;
+ }
+ else
+ {
+ to = get_uint (&arg);
+
+ /* Include the packet at the second argument and silently
+ truncate the range. */
+ if (to < end)
+ to += 1;
+ else
+ to = end;
+
+ no_chunk (arg);
+ }
+ }
+ else
+ {
+ no_chunk (arg);
+
+ if (end - from < size)
+ size = end - from;
+ to = from + size;
+ }
+
+ dont_repeat ();
+ }
+
+ btrace_maint_print_packets (btinfo, from, to);
+}
+
+/* The "maintenance btrace clear-packet-history" command. */
+
+static void
+maint_btrace_clear_packet_history_cmd (const char *args, int from_tty)
+{
+ struct btrace_thread_info *btinfo;
+ struct thread_info *tp;
+
+ if (args != NULL && *args != 0)
+ error (_("Invalid argument."));
+
+ tp = find_thread_ptid (inferior_ptid);
+ if (tp == NULL)
+ error (_("No thread."));
+
+ btinfo = &tp->btrace;
+
+ /* Must clear the maint data before - it depends on BTINFO->DATA. */
+ btrace_maint_clear (btinfo);
+ btrace_data_clear (&btinfo->data);
+}
+
+/* The "maintenance btrace clear" command. */
+
+static void
+maint_btrace_clear_cmd (const char *args, int from_tty)
+{
+ struct thread_info *tp;
+
+ if (args != NULL && *args != 0)
+ error (_("Invalid argument."));
+
+ tp = find_thread_ptid (inferior_ptid);
+ if (tp == NULL)
+ error (_("No thread."));
+
+ btrace_clear (tp);
+}
+
+/* The "maintenance btrace" command. */
+
+static void
+maint_btrace_cmd (const char *args, int from_tty)
+{
+ help_list (maint_btrace_cmdlist, "maintenance btrace ", all_commands,
+ gdb_stdout);
+}
+
+/* The "maintenance set btrace" command. */
+
+static void
+maint_btrace_set_cmd (const char *args, int from_tty)
+{
+ help_list (maint_btrace_set_cmdlist, "maintenance set btrace ", all_commands,
+ gdb_stdout);
+}
+
+/* The "maintenance show btrace" command. */
+
+static void
+maint_btrace_show_cmd (const char *args, int from_tty)
+{
+ help_list (maint_btrace_show_cmdlist, "maintenance show btrace ",
+ all_commands, gdb_stdout);
+}
+
+/* The "maintenance set btrace pt" command. */
+
+static void
+maint_btrace_pt_set_cmd (const char *args, int from_tty)
+{
+ help_list (maint_btrace_pt_set_cmdlist, "maintenance set btrace pt ",
+ all_commands, gdb_stdout);
+}
+
+/* The "maintenance show btrace pt" command. */
+
+static void
+maint_btrace_pt_show_cmd (const char *args, int from_tty)
+{
+ help_list (maint_btrace_pt_show_cmdlist, "maintenance show btrace pt ",
+ all_commands, gdb_stdout);
+}
+
+/* The "maintenance info btrace" command. */
+
+static void
+maint_info_btrace_cmd (const char *args, int from_tty)
+{
+ struct btrace_thread_info *btinfo;
+ struct thread_info *tp;
+ const struct btrace_config *conf;
+
+ if (args != NULL && *args != 0)
+ error (_("Invalid argument."));
+
+ tp = find_thread_ptid (inferior_ptid);
+ if (tp == NULL)
+ error (_("No thread."));
+
+ btinfo = &tp->btrace;
+
+ conf = btrace_conf (btinfo);
+ if (conf == NULL)
+ error (_("No btrace configuration."));
+
+ printf_unfiltered (_("Format: %s.\n"),
+ btrace_format_string (conf->format));
+
+ switch (conf->format)
+ {
+ default:
+ break;
+
+ case BTRACE_FORMAT_BTS:
+ printf_unfiltered (_("Number of packets: %u.\n"),
+ VEC_length (btrace_block_s,
+ btinfo->data.variant.bts.blocks));
+ break;
+
+#if defined (HAVE_LIBIPT)
+ case BTRACE_FORMAT_PT:
+ {
+ struct pt_version version;
+
+ version = pt_library_version ();
+ printf_unfiltered (_("Version: %u.%u.%u%s.\n"), version.major,
+ version.minor, version.build,
+ version.ext != NULL ? version.ext : "");
+
+ btrace_maint_update_pt_packets (btinfo);
+ printf_unfiltered (_("Number of packets: %u.\n"),
+ VEC_length (btrace_pt_packet_s,
+ btinfo->maint.variant.pt.packets));
+ }
+ break;
+#endif /* defined (HAVE_LIBIPT) */
+ }
+}
+
+/* The "maint show btrace pt skip-pad" show value function. */
+
+static void
+show_maint_btrace_pt_skip_pad (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c,
+ const char *value)
+{
+ fprintf_filtered (file, _("Skip PAD packets is %s.\n"), value);
+}
+
+
+/* Initialize btrace maintenance commands. */
+
+void
+_initialize_btrace (void)
+{
+ add_cmd ("btrace", class_maintenance, maint_info_btrace_cmd,
+ _("Info about branch tracing data."), &maintenanceinfolist);
+
+ add_prefix_cmd ("btrace", class_maintenance, maint_btrace_cmd,
+ _("Branch tracing maintenance commands."),
+ &maint_btrace_cmdlist, "maintenance btrace ",
+ 0, &maintenancelist);
+
+ add_prefix_cmd ("btrace", class_maintenance, maint_btrace_set_cmd, _("\
+Set branch tracing specific variables."),
+ &maint_btrace_set_cmdlist, "maintenance set btrace ",
+ 0, &maintenance_set_cmdlist);
+
+ add_prefix_cmd ("pt", class_maintenance, maint_btrace_pt_set_cmd, _("\
+Set Intel Processor Trace specific variables."),
+ &maint_btrace_pt_set_cmdlist, "maintenance set btrace pt ",
+ 0, &maint_btrace_set_cmdlist);
+
+ add_prefix_cmd ("btrace", class_maintenance, maint_btrace_show_cmd, _("\
+Show branch tracing specific variables."),
+ &maint_btrace_show_cmdlist, "maintenance show btrace ",
+ 0, &maintenance_show_cmdlist);
+
+ add_prefix_cmd ("pt", class_maintenance, maint_btrace_pt_show_cmd, _("\
+Show Intel Processor Trace specific variables."),
+ &maint_btrace_pt_show_cmdlist, "maintenance show btrace pt ",
+ 0, &maint_btrace_show_cmdlist);
+
+ add_setshow_boolean_cmd ("skip-pad", class_maintenance,
+ &maint_btrace_pt_skip_pad, _("\
+Set whether PAD packets should be skipped in the btrace packet history."), _("\
+Show whether PAD packets should be skipped in the btrace packet history."),_("\
+When enabled, PAD packets are ignored in the btrace packet history."),
+ NULL, show_maint_btrace_pt_skip_pad,
+ &maint_btrace_pt_set_cmdlist,
+ &maint_btrace_pt_show_cmdlist);
+
+ add_cmd ("packet-history", class_maintenance, maint_btrace_packet_history_cmd,
+ _("Print the raw branch tracing data.\n\
+With no argument, print ten more packets after the previous ten-line print.\n\
+With '-' as argument print ten packets before a previous ten-line print.\n\
+One argument specifies the starting packet of a ten-line print.\n\
+Two arguments with comma between specify starting and ending packets to \
+print.\n\
+Preceded with '+'/'-' the second argument specifies the distance from the \
+first.\n"),
+ &maint_btrace_cmdlist);
+
+ add_cmd ("clear-packet-history", class_maintenance,
+ maint_btrace_clear_packet_history_cmd,
+ _("Clears the branch tracing packet history.\n\
+Discards the raw branch tracing data but not the execution history data.\n\
+"),
+ &maint_btrace_cmdlist);
+
+ add_cmd ("clear", class_maintenance, maint_btrace_clear_cmd,
+ _("Clears the branch tracing data.\n\
+Discards the raw branch tracing data and the execution history data.\n\
+The next 'record' command will fetch the branch tracing data anew.\n\
+"),
+ &maint_btrace_cmdlist);
- return btrace;
}
projects / deliverable / binutils-gdb.git / blobdiff