1  /*
       2   * Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2015-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: LGPL-2.1-or-later
       7   */
       8  
       9  #include "defs.h"
      10  #include <linux/kcmp.h>
      11  #include "xlat/kcmp_types.h"
      12  
      13  #define PRINT_FIELD_PIDFD(where_, field_, tcp_, pid_)			\
      14  	do {								\
      15  		tprints_field_name(#field_);				\
      16  		printfd_pid_tracee_ns((tcp_), (pid_), (where_).field_);	\
      17  	} while (0)
      18  
      19  SYS_FUNC(kcmp)
      20  {
      21  	pid_t pid1 = tcp->u_arg[0];
      22  	pid_t pid2 = tcp->u_arg[1];
      23  	int type = tcp->u_arg[2];
      24  	kernel_ulong_t idx1 = tcp->u_arg[3];
      25  	kernel_ulong_t idx2 = tcp->u_arg[4];
      26  
      27  	/* pid1 */
      28  	printpid(tcp, pid1, PT_TGID);
      29  	tprint_arg_next();
      30  
      31  	/* pid2 */
      32  	printpid(tcp, pid2, PT_TGID);
      33  	tprint_arg_next();
      34  
      35  	/* type */
      36  	printxval(kcmp_types, type, "KCMP_???");
      37  
      38  	switch (type) {
      39  		case KCMP_FILE:
      40  			/* idx1 */
      41  			tprint_arg_next();
      42  			printfd_pid_tracee_ns(tcp, pid1, idx1);
      43  
      44  			/* idx2 */
      45  			tprint_arg_next();
      46  			printfd_pid_tracee_ns(tcp, pid2, idx2);
      47  
      48  			break;
      49  
      50  		case KCMP_EPOLL_TFD: {
      51  			struct kcmp_epoll_slot slot;
      52  
      53  			/* idx1 */
      54  			tprint_arg_next();
      55  			printfd_pid_tracee_ns(tcp, pid1, idx1);
      56  			tprint_arg_next();
      57  
      58  			/* idx2 */
      59  			if (umove_or_printaddr(tcp, idx2, &slot))
      60  				break;
      61  
      62  			tprint_struct_begin();
      63  			PRINT_FIELD_PIDFD(slot, efd, tcp, pid2);
      64  			tprint_struct_next();
      65  			PRINT_FIELD_PIDFD(slot, tfd, tcp, pid2);
      66  			tprint_struct_next();
      67  			PRINT_FIELD_U(slot, toff);
      68  			tprint_struct_end();
      69  
      70  			break;
      71  		}
      72  
      73  		case KCMP_FILES:
      74  		case KCMP_FS:
      75  		case KCMP_IO:
      76  		case KCMP_SIGHAND:
      77  		case KCMP_SYSVSEM:
      78  		case KCMP_VM:
      79  			break;
      80  		default:
      81  			/* idx1 */
      82  			tprint_arg_next();
      83  			PRINT_VAL_X(idx1);
      84  
      85  			/* idx2 */
      86  			tprint_arg_next();
      87  			PRINT_VAL_X(idx2);
      88  	}
      89  
      90  	return RVAL_DECODED;
      91  }