restore: Add opening core file

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

cr-restore.c

@@ -1218,11 +1218,13 @@ static int restore_all_tasks(pid_t pid)
 	return restore_root_task(path, pstree_fd);
 }
 
-static void restorer_test(void)
+static void restorer_test(pid_t pid)
 {
 	restorer_fcall_t restorer_fcall;
+	char path[64];
 	void *args_rip;
 	void *exec_mem;
+	long ret;
 
 	exec_mem = mmap(0, RESTORER_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANON, 0, 0);
 	if (exec_mem == MAP_FAILED) {
@@ -1236,8 +1238,11 @@ static void restorer_test(void)
 
 	args_rip = (void *)restorer_fcall(RESTORER_CMD__GET_ARG_OFFSET);
 
-	strcpy(args_rip, "Hello from restorer!\n");
-	restorer_fcall(RESTORER_CMD__PR_ARG_STRING);
+	snprintf(path, sizeof(path), "core-%d.img", pid);
+	strcpy(args_rip, path);
+
+	ret = restorer_fcall(RESTORER_CMD__RESTORE_CORE);
+	pr_info("RESTORER_CMD__RESTORE_CORE: %lx\n", ret);
 
 	exit(0);
 
@@ -1245,7 +1250,7 @@ static void restorer_test(void)
 
 int cr_restore_tasks(pid_t pid, struct cr_options *opts)
 {
-	restorer_test();
+	restorer_test(pid);
 
 	if (opts->leader_only)
 		return restore_one_task(pid);

restorer.c

@@ -13,8 +13,12 @@
 #include "util.h"
 #include "image.h"
 
+#include "crtools.h"
 #include "restorer.h"
 
+#define get_rt_sigframe_addr(stack)					\
+	(struct rt_sigframe *)(stack - sizeof(long))
+
 #define lea_args_off(p)							\
 	do {								\
 		asm volatile(						\
@@ -25,6 +29,16 @@
 			: "memory");					\
 	} while (0)
 
+static void always_inline write_string(char *str)
+{
+	int len = 0;
+
+	while (str[len])
+		len++;
+
+	sys_write(1, str, len);
+}
+
 long restorer(long cmd)
 {
 	long ret;
@@ -64,6 +78,20 @@ long restorer(long cmd)
 	 */
 	case RESTORER_CMD__RESTORE_CORE:
 	{
+		char *core_path;
+		int fd_core;
+
+		struct core_entry core_entry;
+		struct rt_sigframe *frame;
+
+		lea_args_off(core_path);
+
+		write_string(core_path);
+		write_string("\n");
+
+		fd_core = sys_open(core_path, O_RDONLY, CR_FD_PERM);
+		return fd_core;
+
 		/*
 		 * Unmap all but self, note that we reply on
 		 * caller that it has placed this execution