dump: Add dumping a tasks's flags

We need it to figure out if FPU was used
so that we need to restore context later.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

cr-dump.c

@@ -416,11 +416,11 @@ err:
 #define assign_reg(dst, src, e)		dst.e = (__typeof__(dst.e))src.e
 #define assign_array(dst, src, e)	memcpy(&dst.e, &src.e, sizeof(dst.e))
 
-static int get_task_comm(pid_t pid, u8 *comm)
+static int get_task_stat(pid_t pid, u8 *comm, u32 *flags)
 {
 	FILE *file = NULL;
 	char *tok1, *tok2;
-	int ret = -1;
+	int i, ret = -1;
 
 	snprintf(loc_buf, sizeof(loc_buf), "/proc/%d/stat", pid);
 	file = fopen(loc_buf, "r");
@@ -444,6 +444,19 @@ static int get_task_comm(pid_t pid, u8 *comm)
 		ret = -1;
 	}
 
+	if (!ret) {
+		ret = -1;
+		for (i = 0; i < 8; i++) {
+			tok1 =  strtok(NULL, " ");
+			if (!tok1) {
+				pr_err("/proc/%d/stat is corrupted", pid);
+				goto err;
+			}
+		}
+		*flags = atoi(tok1);
+		ret = 0;
+	}
+
 err:
 	if (file)
 		fclose(file);
@@ -604,8 +617,8 @@ static int dump_task_core_seized(pid_t pid, struct cr_fdset *cr_fdset)
 		goto err_free;
 	pr_info("OK\n");
 
-	pr_info("Obtainting task command ... ");
-	ret = get_task_comm(pid, core->comm);
+	pr_info("Obtainting task stat ... ");
+	ret = get_task_stat(pid, core->comm, &core->flags);
 	if (ret)
 		goto err_free;
 	pr_info("OK\n");

include/image.h

@@ -159,6 +159,8 @@ struct user_fpregs_entry {
 #define GDT_ENTRY_TLS_ENTRIES 3
 #define TASK_COMM_LEN 16
 
+#define TASK_PF_USED_MATH		0x00002000
+
 struct core_entry {
 	struct image_header		hdr;
 	struct user_regs_entry		gpregs;
@@ -166,6 +168,7 @@ struct core_entry {
 	struct desc_struct		tls_array[GDT_ENTRY_TLS_ENTRIES];
 	u32				personality;
 	u8				comm[TASK_COMM_LEN];
+	u32				flags;
 } __packed;
 
 #endif /* CONFIG_X86_64 */