Implement decoding of preadv2 and pwritev2 syscalls

* io.c: Include "xlat/rwf_flags.h".
(do_preadv, do_pwritev, SYS_FUNC(preadv2), SYS_FUNC(pwritev2)):
New functions.
(SYS_FUNC(preadv)): Use do_preadv.
(SYS_FUNC(pwritev)): Use do_pwritev.
* linux/32/syscallent.h (preadv2, pwritev2): New entries.
* linux/64/syscallent.h: Likewise.
* linux/arm/syscallent.h: Likewise.
* linux/hppa/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/ia64/syscallent.h: Likewise.
* linux/m68k/syscallent.h: Likewise.
* linux/mips/syscallent-n32.h: Likewise.
* linux/mips/syscallent-n64.h: Likewise.
* linux/mips/syscallent-o32.h: Likewise.
* linux/powerpc/syscallent.h: Likewise.
* linux/powerpc64/syscallent.h: Likewise.
* linux/s390/syscallent.h: Likewise.
* linux/s390x/syscallent.h: Likewise.
* linux/sparc/syscallent.h: Likewise.
* linux/sparc64/syscallent.h: Likewise.
* linux/x32/syscallent.h: Likewise.
* linux/x86_64/syscallent.h: Likewise.
* syscall.c (dumpio): Handle SEN_preadv2 and SEN_pwritev2.
* xlat/rwf_flags.in: New file.
* NEWS: Mention parsers of new syscalls.

NEWS

@@ -10,8 +10,9 @@ Noteworthy changes in release ?.?? (????-??-??)
   * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
   * Implemented caching of netlink conversations to reduce amount of time
     spent in decoding socket details in -yy mode.
-  * Implemented decoding of copy_file_range syscall.
+  * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
-  * Implemented dumping of preadv, pwritev, and vmsplice syscalls.
+  * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
+    syscalls.
   * Updated lists of ioctl commands from Linux 4.5.
 
 * Bug fixes

io.c

@@ -207,7 +207,10 @@ print_lld_from_low_high_val(struct tcb *tcp, int arg)
 #endif
 }
 
-SYS_FUNC(preadv)
+#include "xlat/rwf_flags.h"
+
+static int
+do_preadv(struct tcb *tcp, const int flags_arg)
 {
 	if (entering(tcp)) {
 		printfd(tcp, tcp->u_arg[0]);
@@ -217,21 +220,50 @@ SYS_FUNC(preadv)
 				tcp->u_rval);
 		tprintf(", %lu, ", tcp->u_arg[2]);
 		print_lld_from_low_high_val(tcp, 3);
+		if (flags_arg >= 0) {
+			tprints(", ");
+			printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
+		}
 	}
 	return 0;
 }
 
-SYS_FUNC(pwritev)
+SYS_FUNC(preadv)
+{
+	return do_preadv(tcp, -1);
+}
+
+SYS_FUNC(preadv2)
+{
+	return do_preadv(tcp, 5);
+}
+
+static int
+do_pwritev(struct tcb *tcp, const int flags_arg)
 {
 	printfd(tcp, tcp->u_arg[0]);
 	tprints(", ");
 	tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
 	tprintf(", %lu, ", tcp->u_arg[2]);
 	print_lld_from_low_high_val(tcp, 3);
+	if (flags_arg >= 0) {
+		tprints(", ");
+		printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
+	}
 
 	return RVAL_DECODED;
 }
 
+SYS_FUNC(pwritev)
+{
+	return do_pwritev(tcp, -1);
+}
+
+SYS_FUNC(pwritev2)
+{
+	return do_pwritev(tcp, 5);
+}
+
 #include "xlat/splice_flags.h"
 
 SYS_FUNC(tee)

linux/32/syscallent.h

@@ -276,6 +276,8 @@
 [283] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [284] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [285] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[286] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[287] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #undef sys_ARCH_mmap
 #undef ARCH_WANT_SYNC_FILE_RANGE2

linux/64/syscallent.h

@@ -269,3 +269,5 @@
 [283] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [284] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [285] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[286] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[287] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},

linux/arm/syscallent.h

@@ -416,6 +416,8 @@
 [389] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [390] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [391] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[392] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[393] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #ifdef __ARM_EABI__
 # define ARM_FIRST_SHUFFLED_SYSCALL 400

linux/hppa/syscallent.h

@@ -349,3 +349,5 @@
 [344] = { 1,	TD,		SEN(userfaultfd),		"userfaultfd",		},
 [345] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [346] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[347] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[348] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},

linux/i386/syscallent.h

@@ -403,6 +403,8 @@
 [375] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [376] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [377] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[378] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[379] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/ia64/syscallent.h

@@ -364,3 +364,5 @@
 [1345] = { 5,	0,		SEN(kcmp),			"kcmp"			},
 [1346] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [1347] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[1348] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[1349] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},

linux/m68k/syscallent.h

@@ -402,6 +402,8 @@
 [374] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [375] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [376] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[377] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[378] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/mips/syscallent-n32.h

@@ -325,6 +325,8 @@
 [6322] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [6323] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [6324] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[6325] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[6326] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 # define SYS_socket_subcall      6400
 # include "subcall.h"

linux/mips/syscallent-n64.h

@@ -321,6 +321,8 @@
 [5318] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [5319] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [5320] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[5321] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[5322] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 # define SYS_socket_subcall      5400
 # include "subcall.h"

linux/mips/syscallent-o32.h

@@ -361,6 +361,8 @@
 [4358] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [4359] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [4360] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[4361] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[4362] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 # define SYS_socket_subcall      4400
 # include "subcall.h"

linux/powerpc/syscallent.h

@@ -406,6 +406,8 @@
 [377] = { 3,	TI,		SEN(shmctl),			"shmctl"		},
 [378] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [379] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[380] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[381] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/powerpc64/syscallent.h

@@ -401,6 +401,8 @@
 [377] = { 3,	TI,		SEN(shmctl),			"shmctl"		},
 [378] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [379] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[380] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[381] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/s390/syscallent.h

@@ -404,6 +404,8 @@
 [373] = { 2,	TN,		SEN(shutdown),			"shutdown"		},
 [374] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [375] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[376] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[377] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/s390x/syscallent.h

@@ -388,6 +388,8 @@
 [373] = { 2,	TN,		SEN(shutdown),			"shutdown"		},
 [374] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [375] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[376] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[377] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/sparc/syscallent.h

@@ -356,6 +356,8 @@
 [355] = { 5,	TN,		SEN(setsockopt),		"setsockopt"		},
 [356] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [357] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[358] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[359] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/sparc64/syscallent.h

@@ -354,6 +354,8 @@
 [355] = { 5,	TN,		SEN(setsockopt),		"setsockopt"		},
 [356] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [357] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[358] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[359] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},
 
 #define SYS_socket_subcall	400
 #include "subcall.h"

linux/x32/syscallent.h

@@ -325,6 +325,8 @@
 [324] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [325] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [326] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[327] = { 6,	TD,		SEN(printargs),			"64:preadv2"		},
+[328] = { 6,	TD,		SEN(printargs),			"64:pwritev2"		},
 [327 ... 511] = { },
 /*
  * x32-specific system call numbers start at 512 to avoid cache impact

linux/x86_64/syscallent.h

@@ -325,3 +325,5 @@
 [324] = { 2,	0,		SEN(membarrier),		"membarrier",		},
 [325] = { 3,	TM,		SEN(mlock2),			"mlock2"		},
 [326] = { 6,	TD,		SEN(copy_file_range),		"copy_file_range"	},
+[327] = { 6,	TD,		SEN(preadv2),			"preadv2"		},
+[328] = { 6,	TD,		SEN(pwritev2),			"pwritev2"		},

syscall.c

@@ -686,6 +686,7 @@ dumpio(struct tcb *tcp)
 			return;
 		case SEN_readv:
 		case SEN_preadv:
+		case SEN_preadv2:
 			dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 				     tcp->u_rval);
 			return;
@@ -707,6 +708,7 @@ dumpio(struct tcb *tcp)
 			break;
 		case SEN_writev:
 		case SEN_pwritev:
+		case SEN_pwritev2:
 		case SEN_vmsplice:
 			dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 			break;

xlat/rwf_flags.in

@@ -0,0 +1 @@
+RWF_HIPRI 1