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-rw-r--r--gdb/nat/linux-btrace.c273
-rw-r--r--gdb/nat/linux-btrace.h3
2 files changed, 20 insertions, 256 deletions
diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c
index 2b37e41..42f56f9 100644
--- a/gdb/nat/linux-btrace.c
+++ b/gdb/nat/linux-btrace.c
@@ -175,23 +175,6 @@ perf_event_read_all (struct perf_event_buffer *pev, gdb_byte **data,
pev->last_head = data_head;
}
-/* Determine the event type.
- Returns zero on success and fills in TYPE; returns -1 otherwise. */
-
-static int
-perf_event_pt_event_type (int *type)
-{
- gdb_file_up file
- = gdb_fopen_cloexec ("/sys/bus/event_source/devices/intel_pt/type", "r");
- if (file == nullptr)
- return -1;
-
- int found = fscanf (file.get (), "%d", type);
- if (found == 1)
- return 0;
- return -1;
-}
-
/* Try to determine the start address of the Linux kernel. */
static uint64_t
@@ -376,176 +359,6 @@ perf_event_read_bts (struct btrace_target_info* tinfo, const uint8_t *begin,
return btrace;
}
-/* Check whether the kernel supports BTS. */
-
-static int
-kernel_supports_bts (void)
-{
- struct perf_event_attr attr;
- pid_t child, pid;
- int status, file;
-
- errno = 0;
- child = fork ();
- switch (child)
- {
- case -1:
- warning (_("test bts: cannot fork: %s."), safe_strerror (errno));
- return 0;
-
- case 0:
- status = ptrace (PTRACE_TRACEME, 0, NULL, NULL);
- if (status != 0)
- {
- warning (_("test bts: cannot PTRACE_TRACEME: %s."),
- safe_strerror (errno));
- _exit (1);
- }
-
- status = raise (SIGTRAP);
- if (status != 0)
- {
- warning (_("test bts: cannot raise SIGTRAP: %s."),
- safe_strerror (errno));
- _exit (1);
- }
-
- _exit (1);
-
- default:
- pid = waitpid (child, &status, 0);
- if (pid != child)
- {
- warning (_("test bts: bad pid %ld, error: %s."),
- (long) pid, safe_strerror (errno));
- return 0;
- }
-
- if (!WIFSTOPPED (status))
- {
- warning (_("test bts: expected stop. status: %d."),
- status);
- return 0;
- }
-
- memset (&attr, 0, sizeof (attr));
-
- attr.type = PERF_TYPE_HARDWARE;
- attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
- attr.sample_period = 1;
- attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR;
- attr.exclude_kernel = 1;
- attr.exclude_hv = 1;
- attr.exclude_idle = 1;
-
- file = syscall (SYS_perf_event_open, &attr, child, -1, -1, 0);
- if (file >= 0)
- close (file);
-
- kill (child, SIGKILL);
- ptrace (PTRACE_KILL, child, NULL, NULL);
-
- pid = waitpid (child, &status, 0);
- if (pid != child)
- {
- warning (_("test bts: bad pid %ld, error: %s."),
- (long) pid, safe_strerror (errno));
- if (!WIFSIGNALED (status))
- warning (_("test bts: expected killed. status: %d."),
- status);
- }
-
- return (file >= 0);
- }
-}
-
-/* Check whether the kernel supports Intel Processor Trace. */
-
-static int
-kernel_supports_pt (void)
-{
- struct perf_event_attr attr;
- pid_t child, pid;
- int status, file, type;
-
- errno = 0;
- child = fork ();
- switch (child)
- {
- case -1:
- warning (_("test pt: cannot fork: %s."), safe_strerror (errno));
- return 0;
-
- case 0:
- status = ptrace (PTRACE_TRACEME, 0, NULL, NULL);
- if (status != 0)
- {
- warning (_("test pt: cannot PTRACE_TRACEME: %s."),
- safe_strerror (errno));
- _exit (1);
- }
-
- status = raise (SIGTRAP);
- if (status != 0)
- {
- warning (_("test pt: cannot raise SIGTRAP: %s."),
- safe_strerror (errno));
- _exit (1);
- }
-
- _exit (1);
-
- default:
- pid = waitpid (child, &status, 0);
- if (pid != child)
- {
- warning (_("test pt: bad pid %ld, error: %s."),
- (long) pid, safe_strerror (errno));
- return 0;
- }
-
- if (!WIFSTOPPED (status))
- {
- warning (_("test pt: expected stop. status: %d."),
- status);
- return 0;
- }
-
- status = perf_event_pt_event_type (&type);
- if (status != 0)
- file = -1;
- else
- {
- memset (&attr, 0, sizeof (attr));
-
- attr.size = sizeof (attr);
- attr.type = type;
- attr.exclude_kernel = 1;
- attr.exclude_hv = 1;
- attr.exclude_idle = 1;
-
- file = syscall (SYS_perf_event_open, &attr, child, -1, -1, 0);
- if (file >= 0)
- close (file);
- }
-
- kill (child, SIGKILL);
- ptrace (PTRACE_KILL, child, NULL, NULL);
-
- pid = waitpid (child, &status, 0);
- if (pid != child)
- {
- warning (_("test pt: bad pid %ld, error: %s."),
- (long) pid, safe_strerror (errno));
- if (!WIFSIGNALED (status))
- warning (_("test pt: expected killed. status: %d."),
- status);
- }
-
- return (file >= 0);
- }
-}
-
/* Check whether an Intel cpu supports BTS. */
static int
@@ -596,64 +409,6 @@ cpu_supports_bts (void)
}
}
-/* Check whether the linux target supports BTS. */
-
-static int
-linux_supports_bts (void)
-{
- static int cached;
-
- if (cached == 0)
- {
- if (!kernel_supports_bts ())
- cached = -1;
- else if (!cpu_supports_bts ())
- cached = -1;
- else
- cached = 1;
- }
-
- return cached > 0;
-}
-
-/* Check whether the linux target supports Intel Processor Trace. */
-
-static int
-linux_supports_pt (void)
-{
- static int cached;
-
- if (cached == 0)
- {
- if (!kernel_supports_pt ())
- cached = -1;
- else
- cached = 1;
- }
-
- return cached > 0;
-}
-
-/* See linux-btrace.h. */
-
-int
-linux_supports_btrace (struct target_ops *ops, enum btrace_format format)
-{
- switch (format)
- {
- case BTRACE_FORMAT_NONE:
- return 0;
-
- case BTRACE_FORMAT_BTS:
- return linux_supports_bts ();
-
- case BTRACE_FORMAT_PT:
- return linux_supports_pt ();
- }
-
- internal_error (__FILE__, __LINE__, _("Unknown branch trace format"));
-}
-
/* Enable branch tracing in BTS format. */
static struct btrace_target_info *
@@ -664,6 +419,9 @@ linux_enable_bts (ptid_t ptid, const struct btrace_config_bts *conf)
__u64 data_offset;
int pid, pg;
+ if (!cpu_supports_bts ())
+ error (_("BTS support has been disabled for the target cpu."));
+
gdb::unique_xmalloc_ptr<btrace_target_info> tinfo
(XCNEW (btrace_target_info));
tinfo->ptid = ptid;
@@ -770,6 +528,23 @@ linux_enable_bts (ptid_t ptid, const struct btrace_config_bts *conf)
#if defined (PERF_ATTR_SIZE_VER5)
+/* Determine the event type.
+ Returns zero on success and fills in TYPE; returns -1 otherwise. */
+
+static int
+perf_event_pt_event_type (int *type)
+{
+ gdb_file_up file =
+ gdb_fopen_cloexec ("/sys/bus/event_source/devices/intel_pt/type", "r");
+ if (file.get () == nullptr)
+ return -1;
+
+ int found = fscanf (file.get (), "%d", type);
+ if (found == 1)
+ return 0;
+ return -1;
+}
+
/* Enable branch tracing in Intel Processor Trace format. */
static struct btrace_target_info *
@@ -1146,14 +921,6 @@ linux_btrace_conf (const struct btrace_target_info *tinfo)
/* See linux-btrace.h. */
-int
-linux_supports_btrace (struct target_ops *ops, enum btrace_format format)
-{
- return 0;
-}
-
-/* See linux-btrace.h. */
-
struct btrace_target_info *
linux_enable_btrace (ptid_t ptid, const struct btrace_config *conf)
{
diff --git a/gdb/nat/linux-btrace.h b/gdb/nat/linux-btrace.h
index 31a8d9e..1180301 100644
--- a/gdb/nat/linux-btrace.h
+++ b/gdb/nat/linux-btrace.h
@@ -103,9 +103,6 @@ struct btrace_target_info
#endif /* HAVE_LINUX_PERF_EVENT_H */
};
-/* See to_supports_btrace in target.h. */
-extern int linux_supports_btrace (struct target_ops *, enum btrace_format);
-
/* See to_enable_btrace in target.h. */
extern struct btrace_target_info *
linux_enable_btrace (ptid_t ptid, const struct btrace_config *conf);
generated by cgit v1.1 at 2024-12-21 17:41:21 +0000