dump: Add GS-TLS handling

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

cr-dump.c

@@ -552,10 +552,14 @@ static int dump_task_tls(pid_t pid, struct desc_struct *tls_array, int size)
 
 	memzero(tls_array, sizeof(*tls_array) * size);
 
-	/* pure x86-64 has a base address only */
-	ret = sys_arch_prctl(ARCH_GET_FS, &tls_array[0].base_addr);
+	/* Pure x86-64 has a base addresses only */
+	ret = sys_arch_prctl(ARCH_GET_FS, &tls_array[FS_TLS].base_addr);
 	if (ret)
-		pr_err("Failed to obtain TLS entry: %d\n", ret);
+		pr_err("Failed to obtain FS_TLS entry: %d\n", ret);
+
+	ret = sys_arch_prctl(ARCH_GET_GS, &tls_array[GS_TLS].base_addr);
+	if (ret)
+		pr_err("Failed to obtain GS_TLS entry: %d\n", ret);
 
 err:
 	return ret;

include/types.h

@@ -12,6 +12,9 @@
 #define ARCH_GET_FS 0x1003
 #define ARCH_GET_GS 0x1004
 
+#define FS_TLS 0
+#define GS_TLS 1
+
 /* some constants for ptrace */
 #define PTRACE_SEIZE		0x4206
 #define PTRACE_INTERRUPT	0x4207