[binutils-gdb] gdb, btrace: fix family and model computation

[binutils-gdb] gdb, btrace: fix family and model computation

[Markus Metzger]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d9757bcd43534875d2003962944d3d130289f82c

commit d9757bcd43534875d2003962944d3d130289f82c
Author: Markus Metzger <markus.t.metzger@intel.com>
Date:   Thu Oct 20 16:27:34 2022 +0200

    gdb, btrace: fix family and model computation
    
    In gdb/nat/linux-btrace.c:btrace_this_cpu() we initialize the cpu
    structure given to the libipt btrace decoder.
    
    We only consider the extended model field for family 0x6 and forget about
    family 0xf and we don't consider the extended family field.  Fix it.

Diff:
---
 gdb/nat/linux-btrace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c
index 4911630ba5c..a951f3b56aa 100644
--- a/gdb/nat/linux-btrace.c
+++ b/gdb/nat/linux-btrace.c
@@ -84,9 +84,11 @@ btrace_this_cpu (void)
 	      cpu.vendor = CV_INTEL;
 
 	      cpu.family = (cpuid >> 8) & 0xf;
-	      cpu.model = (cpuid >> 4) & 0xf;
+	      if (cpu.family == 0xf)
+		cpu.family += (cpuid >> 20) & 0xff;
 
-	      if (cpu.family == 0x6)
+	      cpu.model = (cpuid >> 4) & 0xf;
+	      if ((cpu.family == 0x6) || ((cpu.family & 0xf) == 0xf))
 		cpu.model += (cpuid >> 12) & 0xf0;
 	    }
 	}