[PATCH v2 09/13] btrace: identify cpu

Markus Metzger
2014-11-20T10:47:42Z

Add a struct for identifying a processor and a function to identify the
processor we're running on.

We will need this feature for the new btrace format.

2014-11-20 Markus Metzger <markus.t.metzger@intel.com>

* nat/x86-btrace.h (btrace_cpu_vendor, btrace_cpu)
(btrace_this_cpu): New.
* nat/x86-btrace.c: Include x86-cpuid.h.
(btrace_this_cpu): New.
---
gdb/nat/x86-btrace.c | 37 +++++++++++++++++++++++++++++++++++++
gdb/nat/x86-btrace.h | 31 +++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+)

diff --git a/gdb/nat/x86-btrace.c b/gdb/nat/x86-btrace.c
index 5ca5731..845e895 100644
--- a/gdb/nat/x86-btrace.c
+++ b/gdb/nat/x86-btrace.c
@@ -18,10 +18,47 @@
along with this program. If not, see <http://www.gnu.org/licenses/>. */

#include "x86-btrace.h"
+#include "x86-cpuid.h"

/* See x86-btrace.h. */

+struct btrace_cpu
+btrace_this_cpu (void)
+{
+ struct btrace_cpu cpu;
+ unsigned int eax, ebx, ecx, edx;
+ int ok;
+
+ memset (&cpu, 0, sizeof (cpu));
+
+ ok = x86_cpuid (0, &eax, &ebx, &ecx, &edx);
+ if (ok != 0)
+ {
+ if (ebx == signature_INTEL_ebx && ecx == signature_INTEL_ecx
+ && edx == signature_INTEL_edx)
+ {
+ unsigned int cpuid, ignore;
+
+ ok = x86_cpuid (1, &cpuid, &ignore, &ignore, &ignore);
+ if (ok != 0)
+ {
+ cpu.vendor = CV_INTEL;
+
+ cpu.family = (cpuid >> 8) & 0xf;
+ cpu.model = (cpuid >> 4) & 0xf;
+
+ if (cpu.family == 0x6)
+ cpu.model += (cpuid >> 12) & 0xf0;
+ }
+ }
+ }
+
+ return cpu;
+}
+
+/* See x86-btrace.h. */
+
const char *
btrace_format_string (enum btrace_format format)
{
diff --git a/gdb/nat/x86-btrace.h b/gdb/nat/x86-btrace.h
index 48d6284..05d41fd 100644
--- a/gdb/nat/x86-btrace.h
+++ b/gdb/nat/x86-btrace.h
@@ -62,6 +62,34 @@ enum btrace_format
BTRACE_FORMAT_BTS
};

+/* An enumeration of cpu vendors. */
+
+enum btrace_cpu_vendor
+{
+ /* We do not know this vendor. */
+ CV_UNKNOWN,
+
+ /* Intel. */
+ CV_INTEL
+};
+
+/* A cpu identifier. */
+
+struct btrace_cpu
+{
+ /* The processor vendor. */
+ enum btrace_cpu_vendor vendor;
+
+ /* The cpu family. */
+ unsigned short family;
+
+ /* The cpu model. */
+ unsigned char model;
+
+ /* The cpu stepping. */
+ unsigned char stepping;
+};
+
/* A BTS configuration. */

struct btrace_config_bts
@@ -141,6 +169,9 @@ enum btrace_error
BTRACE_ERR_OVERFLOW
};

+/* Identify the cpu we're running on. */
+extern struct btrace_cpu btrace_this_cpu (void);
+
/* Return a string representation of FORMAT. */
extern const char *btrace_format_string (enum btrace_format format);

--
1.8.3.1