Index: linux/arch/aarch64/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/aarch64/linux_syscall.h,v
retrieving revision 1.14
diff -u -r1.14 linux_syscall.h
--- linux/arch/aarch64/linux_syscall.h	26 Oct 2025 16:25:15 -0000	1.14
+++ linux/arch/aarch64/linux_syscall.h	10 Nov 2025 14:48:04 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscall.h,v 1.14 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
@@ -426,6 +426,9 @@
 /* syscall: "umask" ret: "int" args: "int" */
 #define	LINUX_SYS_umask	166
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	167
+
 /* syscall: "getcpu" ret: "int" args: "unsigned int *" "unsigned int *" "struct linux_getcpu_cache *" */
 #define	LINUX_SYS_getcpu	168
 
Index: linux/arch/aarch64/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/aarch64/linux_syscallargs.h,v
retrieving revision 1.14
diff -u -r1.14 linux_syscallargs.h
--- linux/arch/aarch64/linux_syscallargs.h	26 Oct 2025 16:25:15 -0000	1.14
+++ linux/arch/aarch64/linux_syscallargs.h	10 Nov 2025 14:48:05 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscallargs.h,v 1.14 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
@@ -764,6 +764,11 @@
 
 struct sys_umask_args;
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_getcpu_args {
 	syscallarg(unsigned int *) cpu;
 	syscallarg(unsigned int *) node;
@@ -1447,6 +1452,8 @@
 
 int	sys_umask(struct lwp *, const struct sys_umask_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_getcpu(struct lwp *, const struct linux_sys_getcpu_args *, register_t *);
 
 int	linux_sys_gettimeofday(struct lwp *, const struct linux_sys_gettimeofday_args *, register_t *);
Index: linux/arch/aarch64/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/aarch64/linux_syscalls.c,v
retrieving revision 1.14
diff -u -r1.14 linux_syscalls.c
--- linux/arch/aarch64/linux_syscalls.c	26 Oct 2025 16:25:15 -0000	1.14
+++ linux/arch/aarch64/linux_syscalls.c	10 Nov 2025 14:48:05 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscalls.c,v 1.14 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.14 2025/10/26 16:25:15 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #if defined(_KERNEL_OPT)
@@ -209,7 +209,7 @@
 	/* 164 */	"setrlimit",
 	/* 165 */	"getrusage",
 	/* 166 */	"umask",
-	/* 167 */	"#167 (unimplemented prctl)",
+	/* 167 */	"__prctl",
 	/* 168 */	"getcpu",
 	/* 169 */	"gettimeofday",
 	/* 170 */	"settimeofday",
@@ -747,7 +747,7 @@
 	/* 164 */	NULL, /* setrlimit */
 	/* 165 */	NULL, /* getrusage */
 	/* 166 */	NULL, /* umask */
-	/* 167 */	NULL, /* unimplemented prctl */
+	/* 167 */	NULL, /* __prctl */
 	/* 168 */	NULL, /* getcpu */
 	/* 169 */	NULL, /* gettimeofday */
 	/* 170 */	NULL, /* settimeofday */
Index: linux/arch/aarch64/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/aarch64/linux_sysent.c,v
retrieving revision 1.14
diff -u -r1.14 linux_sysent.c
--- linux/arch/aarch64/linux_sysent.c	26 Oct 2025 16:25:15 -0000	1.14
+++ linux/arch/aarch64/linux_sysent.c	10 Nov 2025 14:48:05 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_sysent.c,v 1.14 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.14 2025/10/26 16:25:15 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include "opt_sysv.h"
@@ -771,8 +771,10 @@
 		.sy_call = (sy_call_t *)sys_umask
 	},		/* 166 = umask */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 167 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 167 = __prctl */
 	{
 		ns(struct linux_sys_getcpu_args),
 		.sy_flags = SYCALL_ARG_PTR,
Index: linux/arch/aarch64/linux_systrace_args.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/aarch64/linux_systrace_args.c,v
retrieving revision 1.14
diff -u -r1.14 linux_systrace_args.c
--- linux/arch/aarch64/linux_systrace_args.c	26 Oct 2025 16:25:15 -0000	1.14
+++ linux/arch/aarch64/linux_systrace_args.c	10 Nov 2025 14:48:06 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_systrace_args.c,v 1.14 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument to DTrace register array conversion.
@@ -1187,6 +1187,14 @@
 		*n_args = 1;
 		break;
 	}
+	/* linux_sys___prctl */
+	case 167: {
+		const struct linux_sys___prctl_args *p = params;
+		iarg[0] = SCARG(p, code); /* int */
+		uarg[1] = (intptr_t) SCARG(p, args[0]); /* void * */
+		*n_args = 2;
+		break;
+	}
 	/* linux_sys_getcpu */
 	case 168: {
 		const struct linux_sys_getcpu_args *p = params;
@@ -3892,6 +3900,19 @@
 			break;
 		};
 		break;
+	/* linux_sys___prctl */
+	case 167:
+		switch(ndx) {
+		case 0:
+			p = "int";
+			break;
+		case 1:
+			p = "void *";
+			break;
+		default:
+			break;
+		};
+		break;
 	/* linux_sys_getcpu */
 	case 168:
 		switch(ndx) {
@@ -5772,6 +5793,11 @@
 		if (ndx == 0 || ndx == 1)
 			p = "int";
 		break;
+	/* linux_sys___prctl */
+	case 167:
+		if (ndx == 0 || ndx == 1)
+			p = "int";
+		break;
 	/* linux_sys_getcpu */
 	case 168:
 		if (ndx == 0 || ndx == 1)
Index: linux/arch/aarch64/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/aarch64/syscalls.master,v
retrieving revision 1.15
diff -u -r1.15 syscalls.master
--- linux/arch/aarch64/syscalls.master	26 Oct 2025 16:19:05 -0000	1.15
+++ linux/arch/aarch64/syscalls.master	10 Nov 2025 14:48:06 -0000
@@ -347,7 +347,8 @@
 165	NOARGS		{ int|compat_50_sys||getrusage(int who, \
 			    struct rusage50 *rusage); }
 166	NOARGS		{ int|sys||umask(int newmask); }
-167	UNIMPL		prctl
+167	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 168	STD		{ int|linux_sys||getcpu(unsigned int *cpu, \
 			    unsigned int *node, \
 			    struct linux_getcpu_cache *tcache); }
Index: linux/arch/alpha/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/alpha/linux_syscall.h,v
retrieving revision 1.123
diff -u -r1.123 linux_syscall.h
--- linux/arch/alpha/linux_syscall.h	26 Oct 2025 16:25:15 -0000	1.123
+++ linux/arch/alpha/linux_syscall.h	10 Nov 2025 14:48:06 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscall.h,v 1.123 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
@@ -504,6 +504,9 @@
 /* syscall: "getresuid" ret: "int" args: "uid_t *" "uid_t *" "uid_t *" */
 #define	LINUX_SYS_getresuid	344
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	348
+
 /* syscall: "pread" ret: "int" args: "int" "char *" "size_t" "off_t" */
 #define	LINUX_SYS_pread	349
 
Index: linux/arch/alpha/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/alpha/linux_syscallargs.h,v
retrieving revision 1.122
diff -u -r1.122 linux_syscallargs.h
--- linux/arch/alpha/linux_syscallargs.h	26 Oct 2025 16:25:15 -0000	1.122
+++ linux/arch/alpha/linux_syscallargs.h	10 Nov 2025 14:48:06 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscallargs.h,v 1.122 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
@@ -707,6 +707,11 @@
 };
 check_syscall_args(linux_sys_getresuid)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_pread_args {
 	syscallarg(int) fd;
 	syscallarg(char *) buf;
@@ -1771,6 +1776,8 @@
 
 int	linux_sys_getresuid(struct lwp *, const struct linux_sys_getresuid_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_pread(struct lwp *, const struct linux_sys_pread_args *, register_t *);
 
 int	linux_sys_pwrite(struct lwp *, const struct linux_sys_pwrite_args *, register_t *);
Index: linux/arch/alpha/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/alpha/linux_syscalls.c,v
retrieving revision 1.124
diff -u -r1.124 linux_syscalls.c
--- linux/arch/alpha/linux_syscalls.c	26 Oct 2025 16:25:15 -0000	1.124
+++ linux/arch/alpha/linux_syscalls.c	10 Nov 2025 14:48:06 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscalls.c,v 1.124 2025/10/26 16:25:15 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.124 2025/10/26 16:25:15 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #if defined(_KERNEL_OPT)
@@ -410,7 +410,7 @@
 	/* 345 */	"#345 (unimplemented pciconfig_read)",
 	/* 346 */	"#346 (unimplemented pciconfig_write)",
 	/* 347 */	"#347 (unimplemented query_module)",
-	/* 348 */	"#348 (unimplemented prctl)",
+	/* 348 */	"__prctl",
 	/* 349 */	"pread",
 	/* 350 */	"pwrite",
 	/* 351 */	"rt_sigreturn",
@@ -1463,7 +1463,7 @@
 	/* 345 */	NULL, /* unimplemented pciconfig_read */
 	/* 346 */	NULL, /* unimplemented pciconfig_write */
 	/* 347 */	NULL, /* unimplemented query_module */
-	/* 348 */	NULL, /* unimplemented prctl */
+	/* 348 */	NULL, /* __prctl */
 	/* 349 */	NULL, /* pread */
 	/* 350 */	NULL, /* pwrite */
 	/* 351 */	NULL, /* rt_sigreturn */
Index: linux/arch/alpha/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/alpha/linux_sysent.c,v
retrieving revision 1.123
diff -u -r1.123 linux_sysent.c
--- linux/arch/alpha/linux_sysent.c	26 Oct 2025 16:25:16 -0000	1.123
+++ linux/arch/alpha/linux_sysent.c	10 Nov 2025 14:48:07 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_sysent.c,v 1.123 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.123 2025/10/26 16:25:16 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include "opt_sysv.h"
@@ -1384,8 +1384,10 @@
 		.sy_call = linux_sys_nosys,
 	},		/* 347 = filler */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 348 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 348 = __prctl */
 	{
 		ns(struct linux_sys_pread_args),
 		.sy_flags = SYCALL_NARGS64_VAL(1) | SYCALL_ARG3_64 | SYCALL_ARG_PTR,
Index: linux/arch/alpha/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/alpha/syscalls.master,v
retrieving revision 1.110
diff -u -r1.110 syscalls.master
--- linux/arch/alpha/syscalls.master	26 Oct 2025 16:19:05 -0000	1.110
+++ linux/arch/alpha/syscalls.master	10 Nov 2025 14:48:07 -0000
@@ -558,7 +558,8 @@
 345	UNIMPL		pciconfig_read
 346	UNIMPL		pciconfig_write
 347	UNIMPL		query_module
-348	UNIMPL		prctl
+348	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 349	STD		{ int|linux_sys||pread(int fd, char *buf, \
 			    size_t nbyte, off_t offset); }
 350	STD		{ int|linux_sys||pwrite(int fd, char *buf, \
Index: linux/arch/amd64/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/amd64/linux_syscall.h,v
retrieving revision 1.85
diff -u -r1.85 linux_syscall.h
--- linux/arch/amd64/linux_syscall.h	26 Oct 2025 16:25:16 -0000	1.85
+++ linux/arch/amd64/linux_syscall.h	10 Nov 2025 14:48:07 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscall.h,v 1.85 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
@@ -471,6 +471,9 @@
 /* syscall: "__sysctl" ret: "int" args: "struct linux___sysctl *" */
 #define	LINUX_SYS___sysctl	156
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	157
+
 /* syscall: "arch_prctl" ret: "int" args: "int" "unsigned long" */
 #define	LINUX_SYS_arch_prctl	158
 
Index: linux/arch/amd64/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/amd64/linux_syscallargs.h,v
retrieving revision 1.85
diff -u -r1.85 linux_syscallargs.h
--- linux/arch/amd64/linux_syscallargs.h	26 Oct 2025 16:25:16 -0000	1.85
+++ linux/arch/amd64/linux_syscallargs.h	10 Nov 2025 14:48:07 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscallargs.h,v 1.85 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
@@ -652,6 +652,11 @@
 };
 check_syscall_args(linux_sys___sysctl)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_arch_prctl_args {
 	syscallarg(int) code;
 	syscallarg(unsigned long) addr;
@@ -1648,6 +1653,8 @@
 
 int	linux_sys___sysctl(struct lwp *, const struct linux_sys___sysctl_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_arch_prctl(struct lwp *, const struct linux_sys_arch_prctl_args *, register_t *);
 
 int	linux_sys_setrlimit(struct lwp *, const struct linux_sys_setrlimit_args *, register_t *);
Index: linux/arch/amd64/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/amd64/linux_syscalls.c,v
retrieving revision 1.85
diff -u -r1.85 linux_syscalls.c
--- linux/arch/amd64/linux_syscalls.c	26 Oct 2025 16:25:16 -0000	1.85
+++ linux/arch/amd64/linux_syscalls.c	10 Nov 2025 14:48:07 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscalls.c,v 1.85 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.85 2025/10/26 16:25:16 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #if defined(_KERNEL_OPT)
@@ -227,7 +227,7 @@
 	/* 154 */	"modify_ldt",
 	/* 155 */	"#155 (unimplemented pivot_root)",
 	/* 156 */	"__sysctl",
-	/* 157 */	"#157 (unimplemented prctl)",
+	/* 157 */	"__prctl",
 	/* 158 */	"arch_prctl",
 	/* 159 */	"#159 (unimplemented adjtimex)",
 	/* 160 */	"setrlimit",
@@ -771,7 +771,7 @@
 	/* 154 */	NULL, /* modify_ldt */
 	/* 155 */	NULL, /* unimplemented pivot_root */
 	/* 156 */	NULL, /* __sysctl */
-	/* 157 */	NULL, /* unimplemented prctl */
+	/* 157 */	NULL, /* __prctl */
 	/* 158 */	NULL, /* arch_prctl */
 	/* 159 */	NULL, /* unimplemented adjtimex */
 	/* 160 */	NULL, /* setrlimit */
Index: linux/arch/amd64/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/amd64/linux_sysent.c,v
retrieving revision 1.85
diff -u -r1.85 linux_sysent.c
--- linux/arch/amd64/linux_sysent.c	26 Oct 2025 16:25:16 -0000	1.85
+++ linux/arch/amd64/linux_sysent.c	10 Nov 2025 14:48:08 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_sysent.c,v 1.85 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.85 2025/10/26 16:25:16 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include "opt_sysv.h"
@@ -793,8 +793,10 @@
 		.sy_call = (sy_call_t *)linux_sys___sysctl
 	},		/* 156 = __sysctl */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 157 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 157 = __prctl */
 	{
 		ns(struct linux_sys_arch_prctl_args),
 		.sy_call = (sy_call_t *)linux_sys_arch_prctl
Index: linux/arch/amd64/linux_systrace_args.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/amd64/linux_systrace_args.c,v
retrieving revision 1.29
diff -u -r1.29 linux_systrace_args.c
--- linux/arch/amd64/linux_systrace_args.c	26 Oct 2025 16:25:16 -0000	1.29
+++ linux/arch/amd64/linux_systrace_args.c	10 Nov 2025 14:48:08 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_systrace_args.c,v 1.29 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument to DTrace register array conversion.
@@ -1230,6 +1230,14 @@
 		*n_args = 1;
 		break;
 	}
+	/* linux_sys___prctl */
+	case 157: {
+		const struct linux_sys___prctl_args *p = params;
+		iarg[0] = SCARG(p, code); /* int */
+		uarg[1] = (intptr_t) SCARG(p, args[0]); /* void * */
+		*n_args = 2;
+		break;
+	}
 	/* linux_sys_arch_prctl */
 	case 158: {
 		const struct linux_sys_arch_prctl_args *p = params;
@@ -4187,6 +4195,19 @@
 			break;
 		};
 		break;
+	/* linux_sys___prctl */
+	case 157:
+		switch(ndx) {
+		case 0:
+			p = "int";
+			break;
+		case 1:
+			p = "void *";
+			break;
+		default:
+			break;
+		};
+		break;
 	/* linux_sys_arch_prctl */
 	case 158:
 		switch(ndx) {
@@ -6614,6 +6635,11 @@
 		if (ndx == 0 || ndx == 1)
 			p = "int";
 		break;
+	/* linux_sys___prctl */
+	case 157:
+		if (ndx == 0 || ndx == 1)
+			p = "int";
+		break;
 	/* linux_sys_arch_prctl */
 	case 158:
 		if (ndx == 0 || ndx == 1)
Index: linux/arch/amd64/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/amd64/syscalls.master,v
retrieving revision 1.76
diff -u -r1.76 syscalls.master
--- linux/arch/amd64/syscalls.master	26 Oct 2025 16:19:05 -0000	1.76
+++ linux/arch/amd64/syscalls.master	10 Nov 2025 14:48:08 -0000
@@ -340,7 +340,8 @@
 			    size_t bytecount); }
 155	UNIMPL		pivot_root
 156	STD		{ int|linux_sys||__sysctl(struct linux___sysctl *lsp); }
-157	UNIMPL		prctl
+157	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 158	STD		{ int|linux_sys||arch_prctl(int code, \
 			    unsigned long addr); }
 159	UNIMPL		adjtimex
Index: linux/arch/arm/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/arm/linux_syscall.h,v
retrieving revision 1.96
diff -u -r1.96 linux_syscall.h
--- linux/arch/arm/linux_syscall.h	26 Oct 2025 16:25:16 -0000	1.96
+++ linux/arch/arm/linux_syscall.h	10 Nov 2025 14:48:08 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscall.h,v 1.96 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
@@ -441,6 +441,9 @@
 /* syscall: "getresgid16" ret: "int" args: "linux_gid16_t *" "linux_gid16_t *" "linux_gid16_t *" */
 #define	LINUX_SYS_getresgid16	171
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	172
+
 /* syscall: "rt_sigaction" ret: "int" args: "int" "const struct linux_sigaction *" "struct linux_sigaction *" "size_t" */
 #define	LINUX_SYS_rt_sigaction	174
 
Index: linux/arch/arm/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/arm/linux_syscallargs.h,v
retrieving revision 1.96
diff -u -r1.96 linux_syscallargs.h
--- linux/arch/arm/linux_syscallargs.h	26 Oct 2025 16:25:16 -0000	1.96
+++ linux/arch/arm/linux_syscallargs.h	10 Nov 2025 14:48:09 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscallargs.h,v 1.96 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
@@ -604,6 +604,11 @@
 };
 check_syscall_args(linux_sys_getresgid16)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_rt_sigaction_args {
 	syscallarg(int) signum;
 	syscallarg(const struct linux_sigaction *) nsa;
@@ -1694,6 +1699,8 @@
 
 int	linux_sys_getresgid16(struct lwp *, const struct linux_sys_getresgid16_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_rt_sigaction(struct lwp *, const struct linux_sys_rt_sigaction_args *, register_t *);
 
 int	linux_sys_rt_sigprocmask(struct lwp *, const struct linux_sys_rt_sigprocmask_args *, register_t *);
Index: linux/arch/arm/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/arm/linux_syscalls.c,v
retrieving revision 1.96
diff -u -r1.96 linux_syscalls.c
--- linux/arch/arm/linux_syscalls.c	26 Oct 2025 16:25:16 -0000	1.96
+++ linux/arch/arm/linux_syscalls.c	10 Nov 2025 14:48:09 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscalls.c,v 1.96 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.96 2025/10/26 16:25:16 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include <sys/param.h>
@@ -208,7 +208,7 @@
 	/* 169 */	"#169 (unimplemented nfsservctl)",
 	/* 170 */	"setresgid16",
 	/* 171 */	"getresgid16",
-	/* 172 */	"#172 (unimplemented prctl)",
+	/* 172 */	"__prctl",
 	/* 173 */	"#173 (unimplemented rt_sigreturn)",
 	/* 174 */	"rt_sigaction",
 	/* 175 */	"rt_sigprocmask",
@@ -730,7 +730,7 @@
 	/* 169 */	NULL, /* unimplemented nfsservctl */
 	/* 170 */	NULL, /* setresgid16 */
 	/* 171 */	NULL, /* getresgid16 */
-	/* 172 */	NULL, /* unimplemented prctl */
+	/* 172 */	NULL, /* __prctl */
 	/* 173 */	NULL, /* unimplemented rt_sigreturn */
 	/* 174 */	NULL, /* rt_sigaction */
 	/* 175 */	NULL, /* rt_sigprocmask */
Index: linux/arch/arm/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/arm/linux_sysent.c,v
retrieving revision 1.96
diff -u -r1.96 linux_sysent.c
--- linux/arch/arm/linux_sysent.c	26 Oct 2025 16:25:16 -0000	1.96
+++ linux/arch/arm/linux_sysent.c	10 Nov 2025 14:48:09 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_sysent.c,v 1.96 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.96 2025/10/26 16:25:16 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #include <sys/param.h>
 #include <sys/poll.h>
@@ -764,8 +764,10 @@
 		.sy_call = (sy_call_t *)linux_sys_getresgid16
 	},		/* 171 = getresgid16 */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 172 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 172 = __prctl */
 	{
 		.sy_call = linux_sys_nosys,
 	},		/* 173 = filler */
Index: linux/arch/arm/linux_systrace_args.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/arm/linux_systrace_args.c,v
retrieving revision 1.29
diff -u -r1.29 linux_systrace_args.c
--- linux/arch/arm/linux_systrace_args.c	26 Oct 2025 16:25:16 -0000	1.29
+++ linux/arch/arm/linux_systrace_args.c	10 Nov 2025 14:48:10 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_systrace_args.c,v 1.29 2025/10/26 16:25:16 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument to DTrace register array conversion.
@@ -1082,6 +1082,14 @@
 		*n_args = 3;
 		break;
 	}
+	/* linux_sys___prctl */
+	case 172: {
+		const struct linux_sys___prctl_args *p = params;
+		iarg[0] = SCARG(p, code); /* int */
+		uarg[1] = (intptr_t) SCARG(p, args[0]); /* void * */
+		*n_args = 2;
+		break;
+	}
 	/* linux_sys_rt_sigaction */
 	case 174: {
 		const struct linux_sys_rt_sigaction_args *p = params;
@@ -3974,6 +3982,19 @@
 			break;
 		};
 		break;
+	/* linux_sys___prctl */
+	case 172:
+		switch(ndx) {
+		case 0:
+			p = "int";
+			break;
+		case 1:
+			p = "void *";
+			break;
+		default:
+			break;
+		};
+		break;
 	/* linux_sys_rt_sigaction */
 	case 174:
 		switch(ndx) {
@@ -6749,6 +6770,11 @@
 		if (ndx == 0 || ndx == 1)
 			p = "int";
 		break;
+	/* linux_sys___prctl */
+	case 172:
+		if (ndx == 0 || ndx == 1)
+			p = "int";
+		break;
 	/* linux_sys_rt_sigaction */
 	case 174:
 		if (ndx == 0 || ndx == 1)
Index: linux/arch/arm/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/arm/syscalls.master,v
retrieving revision 1.84
diff -u -r1.84 syscalls.master
--- linux/arch/arm/syscalls.master	26 Oct 2025 16:24:59 -0000	1.84
+++ linux/arch/arm/syscalls.master	10 Nov 2025 14:48:10 -0000
@@ -295,7 +295,8 @@
 			    linux_gid16_t egid, linux_gid16_t sgid); }
 171	STD		{ int|linux_sys||getresgid16(linux_gid16_t *rgid, \
 			    linux_gid16_t *egid, linux_gid16_t *sgid); }
-172	UNIMPL		prctl
+172	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 173	UNIMPL		rt_sigreturn
 ;173	STD		{ int|linux_sys||rt_sigreturn( \
 ;			    struct linux_rt_sigframe *sfp); }
Index: linux/arch/i386/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/i386/linux_syscall.h,v
retrieving revision 1.129
diff -u -r1.129 linux_syscall.h
--- linux/arch/i386/linux_syscall.h	28 Sep 2024 19:36:20 -0000	1.129
+++ linux/arch/i386/linux_syscall.h	10 Nov 2025 14:48:10 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscall.h,v 1.129 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
@@ -451,6 +451,9 @@
 /* syscall: "getresgid16" ret: "int" args: "linux_gid16_t *" "linux_gid16_t *" "linux_gid16_t *" */
 #define	LINUX_SYS_getresgid16	171
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	172
+
 /* syscall: "rt_sigreturn" ret: "int" args: "struct linux_ucontext *" */
 #define	LINUX_SYS_rt_sigreturn	173
 
Index: linux/arch/i386/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/i386/linux_syscallargs.h,v
retrieving revision 1.129
diff -u -r1.129 linux_syscallargs.h
--- linux/arch/i386/linux_syscallargs.h	28 Sep 2024 19:36:20 -0000	1.129
+++ linux/arch/i386/linux_syscallargs.h	10 Nov 2025 14:48:10 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscallargs.h,v 1.129 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
@@ -622,6 +622,11 @@
 };
 check_syscall_args(linux_sys_getresgid16)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_rt_sigreturn_args {
 	syscallarg(struct linux_ucontext *) ucp;
 };
@@ -1712,6 +1717,8 @@
 
 int	linux_sys_getresgid16(struct lwp *, const struct linux_sys_getresgid16_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_rt_sigreturn(struct lwp *, const struct linux_sys_rt_sigreturn_args *, register_t *);
 
 int	linux_sys_rt_sigaction(struct lwp *, const struct linux_sys_rt_sigaction_args *, register_t *);
Index: linux/arch/i386/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/i386/linux_syscalls.c,v
retrieving revision 1.130
diff -u -r1.130 linux_syscalls.c
--- linux/arch/i386/linux_syscalls.c	28 Sep 2024 19:36:20 -0000	1.130
+++ linux/arch/i386/linux_syscalls.c	10 Nov 2025 14:48:10 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscalls.c,v 1.130 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.130 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include <sys/param.h>
@@ -207,7 +207,7 @@
 	/* 169 */	"#169 (unimplemented nfsservctl)",
 	/* 170 */	"setresgid16",
 	/* 171 */	"getresgid16",
-	/* 172 */	"#172 (unimplemented prctl)",
+	/* 172 */	"__prctl",
 	/* 173 */	"rt_sigreturn",
 	/* 174 */	"rt_sigaction",
 	/* 175 */	"rt_sigprocmask",
@@ -729,7 +729,7 @@
 	/* 169 */	NULL, /* unimplemented nfsservctl */
 	/* 170 */	NULL, /* setresgid16 */
 	/* 171 */	NULL, /* getresgid16 */
-	/* 172 */	NULL, /* unimplemented prctl */
+	/* 172 */	NULL, /* __prctl */
 	/* 173 */	NULL, /* rt_sigreturn */
 	/* 174 */	NULL, /* rt_sigaction */
 	/* 175 */	NULL, /* rt_sigprocmask */
Index: linux/arch/i386/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/i386/linux_sysent.c,v
retrieving revision 1.129
diff -u -r1.129 linux_sysent.c
--- linux/arch/i386/linux_sysent.c	28 Sep 2024 19:36:20 -0000	1.129
+++ linux/arch/i386/linux_sysent.c	10 Nov 2025 14:48:11 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_sysent.c,v 1.129 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.129 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #include <sys/param.h>
 #include <sys/poll.h>
@@ -769,8 +769,10 @@
 		.sy_call = (sy_call_t *)linux_sys_getresgid16
 	},		/* 171 = getresgid16 */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 172 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 172 = __prctl */
 	{
 		ns(struct linux_sys_rt_sigreturn_args),
 		.sy_flags = SYCALL_ARG_PTR,
Index: linux/arch/i386/linux_systrace_args.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/i386/linux_systrace_args.c,v
retrieving revision 1.24
diff -u -r1.24 linux_systrace_args.c
--- linux/arch/i386/linux_systrace_args.c	28 Sep 2024 19:36:20 -0000	1.24
+++ linux/arch/i386/linux_systrace_args.c	10 Nov 2025 14:48:11 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_systrace_args.c,v 1.24 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument to DTrace register array conversion.
@@ -1114,6 +1114,14 @@
 		*n_args = 3;
 		break;
 	}
+	/* linux_sys___prctl */
+	case 172: {
+		const struct linux_sys___prctl_args *p = params;
+		iarg[0] = SCARG(p, code); /* int */
+		uarg[1] = (intptr_t) SCARG(p, args[0]); /* void * */
+		*n_args = 2;
+		break;
+	}
 	/* linux_sys_rt_sigreturn */
 	case 173: {
 		const struct linux_sys_rt_sigreturn_args *p = params;
@@ -4044,6 +4052,19 @@
 			break;
 		};
 		break;
+	/* linux_sys___prctl */
+	case 172:
+		switch(ndx) {
+		case 0:
+			p = "int";
+			break;
+		case 1:
+			p = "void *";
+			break;
+		default:
+			break;
+		};
+		break;
 	/* linux_sys_rt_sigreturn */
 	case 173:
 		switch(ndx) {
@@ -6809,6 +6830,11 @@
 		if (ndx == 0 || ndx == 1)
 			p = "int";
 		break;
+	/* linux_sys___prctl */
+	case 172:
+		if (ndx == 0 || ndx == 1)
+			p = "int";
+		break;
 	/* linux_sys_rt_sigreturn */
 	case 173:
 		if (ndx == 0 || ndx == 1)
Index: linux/arch/i386/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/i386/syscalls.master,v
retrieving revision 1.137
diff -u -r1.137 syscalls.master
--- linux/arch/i386/syscalls.master	28 Sep 2024 19:35:55 -0000	1.137
+++ linux/arch/i386/syscalls.master	10 Nov 2025 14:48:12 -0000
@@ -296,7 +296,8 @@
 			    linux_gid16_t egid, linux_gid16_t sgid); }
 171	STD		{ int|linux_sys||getresgid16(linux_gid16_t *rgid, \
 			    linux_gid16_t *egid, linux_gid16_t *sgid); }
-172	UNIMPL		prctl
+172	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 173	STD		{ int|linux_sys||rt_sigreturn( \
 			    struct linux_ucontext *ucp); }
 174	STD		{ int|linux_sys||rt_sigaction(int signum, \
Index: linux/arch/m68k/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/m68k/linux_syscall.h,v
retrieving revision 1.120
diff -u -r1.120 linux_syscall.h
--- linux/arch/m68k/linux_syscall.h	28 Sep 2024 19:36:20 -0000	1.120
+++ linux/arch/m68k/linux_syscall.h	10 Nov 2025 14:48:12 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscall.h,v 1.120 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
@@ -449,6 +449,9 @@
 /* syscall: "getresgid16" ret: "int" args: "linux_gid16_t *" "linux_gid16_t *" "linux_gid16_t *" */
 #define	LINUX_SYS_getresgid16	171
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	172
+
 /* syscall: "rt_sigreturn" ret: "int" args: */
 #define	LINUX_SYS_rt_sigreturn	173
 
Index: linux/arch/m68k/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/m68k/linux_syscallargs.h,v
retrieving revision 1.119
diff -u -r1.119 linux_syscallargs.h
--- linux/arch/m68k/linux_syscallargs.h	28 Sep 2024 19:36:20 -0000	1.119
+++ linux/arch/m68k/linux_syscallargs.h	10 Nov 2025 14:48:12 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscallargs.h,v 1.119 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
@@ -603,6 +603,11 @@
 };
 check_syscall_args(linux_sys_getresgid16)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_rt_sigaction_args {
 	syscallarg(int) signum;
 	syscallarg(const struct linux_sigaction *) nsa;
@@ -1685,6 +1690,8 @@
 
 int	linux_sys_getresgid16(struct lwp *, const struct linux_sys_getresgid16_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_rt_sigreturn(struct lwp *, const void *, register_t *);
 
 int	linux_sys_rt_sigaction(struct lwp *, const struct linux_sys_rt_sigaction_args *, register_t *);
Index: linux/arch/m68k/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/m68k/linux_syscalls.c,v
retrieving revision 1.120
diff -u -r1.120 linux_syscalls.c
--- linux/arch/m68k/linux_syscalls.c	28 Sep 2024 19:36:20 -0000	1.120
+++ linux/arch/m68k/linux_syscalls.c	10 Nov 2025 14:48:12 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_syscalls.c,v 1.120 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.120 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #if defined(_KERNEL_OPT)
@@ -227,7 +227,7 @@
 	/* 169 */	"#169 (unimplemented nfsservctl)",
 	/* 170 */	"setresgid16",
 	/* 171 */	"getresgid16",
-	/* 172 */	"#172 (unimplemented prctl)",
+	/* 172 */	"__prctl",
 	/* 173 */	"rt_sigreturn",
 	/* 174 */	"rt_sigaction",
 	/* 175 */	"rt_sigprocmask",
@@ -765,7 +765,7 @@
 	/* 169 */	NULL, /* unimplemented nfsservctl */
 	/* 170 */	NULL, /* setresgid16 */
 	/* 171 */	NULL, /* getresgid16 */
-	/* 172 */	NULL, /* unimplemented prctl */
+	/* 172 */	NULL, /* __prctl */
 	/* 173 */	NULL, /* rt_sigreturn */
 	/* 174 */	NULL, /* rt_sigaction */
 	/* 175 */	NULL, /* rt_sigprocmask */
Index: linux/arch/m68k/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/m68k/linux_sysent.c,v
retrieving revision 1.120
diff -u -r1.120 linux_sysent.c
--- linux/arch/m68k/linux_sysent.c	28 Sep 2024 19:36:20 -0000	1.120
+++ linux/arch/m68k/linux_sysent.c	10 Nov 2025 14:48:12 -0000
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_sysent.c,v 1.120 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
@@ -8,7 +8,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.120 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include "opt_compat_netbsd.h"
@@ -786,8 +786,10 @@
 		.sy_call = (sy_call_t *)linux_sys_getresgid16
 	},		/* 171 = getresgid16 */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 172 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 172 = __prctl */
 	{
 		.sy_call = (sy_call_t *)linux_sys_rt_sigreturn
 	},		/* 173 = rt_sigreturn */
Index: linux/arch/m68k/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/m68k/syscalls.master,v
retrieving revision 1.107
diff -u -r1.107 syscalls.master
--- linux/arch/m68k/syscalls.master	28 Sep 2024 19:35:56 -0000	1.107
+++ linux/arch/m68k/syscalls.master	10 Nov 2025 14:48:12 -0000
@@ -315,7 +315,8 @@
 			    linux_gid16_t egid, linux_gid16_t sgid); }
 171	STD		{ int|linux_sys||getresgid16(linux_gid16_t *rgid, \
 			    linux_gid16_t *egid, linux_gid16_t *sgid); }
-172	UNIMPL		prctl
+172	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 173	STD		{ int|linux_sys||rt_sigreturn(void); }
 174	STD		{ int|linux_sys||rt_sigaction(int signum, \
 			    const struct linux_sigaction *nsa, \
Index: linux/arch/mips/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/mips/linux_syscall.h,v
retrieving revision 1.93
diff -u -r1.93 linux_syscall.h
--- linux/arch/mips/linux_syscall.h	28 Sep 2024 19:36:20 -0000	1.93
+++ linux/arch/mips/linux_syscall.h	10 Nov 2025 14:48:13 -0000
@@ -1,10 +1,10 @@
-/* $NetBSD: linux_syscall.h,v 1.93 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.82 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.83 2024/10/01 16:29:15 riastradh Exp
  */
 
 #ifndef _LINUX_SYS_SYSCALL_H_
@@ -478,6 +478,9 @@
 /* syscall: "getresgid" ret: "int" args: "gid_t *" "gid_t *" "gid_t *" */
 #define	LINUX_SYS_getresgid	191
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	192
+
 /* syscall: "rt_sigreturn" ret: "int" args: "struct linux_pt_regs *" */
 #define	LINUX_SYS_rt_sigreturn	193
 
Index: linux/arch/mips/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/mips/linux_syscallargs.h,v
retrieving revision 1.92
diff -u -r1.92 linux_syscallargs.h
--- linux/arch/mips/linux_syscallargs.h	28 Sep 2024 19:36:20 -0000	1.92
+++ linux/arch/mips/linux_syscallargs.h	10 Nov 2025 14:48:13 -0000
@@ -1,10 +1,10 @@
-/* $NetBSD: linux_syscallargs.h,v 1.92 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.82 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.83 2024/10/01 16:29:15 riastradh Exp
  */
 
 #ifndef _LINUX_SYS_SYSCALLARGS_H_
@@ -702,6 +702,11 @@
 };
 check_syscall_args(linux_sys_getresgid)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_rt_sigreturn_args {
 	syscallarg(struct linux_pt_regs *) regs;
 };
@@ -1749,6 +1754,8 @@
 
 int	linux_sys_getresgid(struct lwp *, const struct linux_sys_getresgid_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_rt_sigreturn(struct lwp *, const struct linux_sys_rt_sigreturn_args *, register_t *);
 
 int	linux_sys_rt_sigaction(struct lwp *, const struct linux_sys_rt_sigaction_args *, register_t *);
Index: linux/arch/mips/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/mips/linux_syscalls.c,v
retrieving revision 1.92
diff -u -r1.92 linux_syscalls.c
--- linux/arch/mips/linux_syscalls.c	28 Sep 2024 19:36:20 -0000	1.92
+++ linux/arch/mips/linux_syscalls.c	10 Nov 2025 14:48:13 -0000
@@ -1,14 +1,14 @@
-/* $NetBSD: linux_syscalls.c,v 1.92 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.82 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.83 2024/10/01 16:29:15 riastradh Exp
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.92 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include <sys/param.h>
@@ -224,7 +224,7 @@
 	/* 189 */	"#189 (unimplemented nfsservctl)",
 	/* 190 */	"setresgid",
 	/* 191 */	"getresgid",
-	/* 192 */	"#192 (unimplemented prctl)",
+	/* 192 */	"__prctl",
 	/* 193 */	"rt_sigreturn",
 	/* 194 */	"rt_sigaction",
 	/* 195 */	"rt_sigprocmask",
@@ -741,7 +741,7 @@
 	/* 189 */	NULL, /* unimplemented nfsservctl */
 	/* 190 */	NULL, /* setresgid */
 	/* 191 */	NULL, /* getresgid */
-	/* 192 */	NULL, /* unimplemented prctl */
+	/* 192 */	NULL, /* __prctl */
 	/* 193 */	NULL, /* rt_sigreturn */
 	/* 194 */	NULL, /* rt_sigaction */
 	/* 195 */	NULL, /* rt_sigprocmask */
Index: linux/arch/mips/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/mips/linux_sysent.c,v
retrieving revision 1.92
diff -u -r1.92 linux_sysent.c
--- linux/arch/mips/linux_sysent.c	28 Sep 2024 19:36:20 -0000	1.92
+++ linux/arch/mips/linux_sysent.c	10 Nov 2025 14:48:13 -0000
@@ -1,14 +1,14 @@
-/* $NetBSD: linux_sysent.c,v 1.92 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.82 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.83 2024/10/01 16:29:15 riastradh Exp
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.92 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #include <sys/param.h>
 #include <sys/poll.h>
@@ -845,8 +845,10 @@
 		.sy_call = (sy_call_t *)linux_sys_getresgid
 	},		/* 191 = getresgid */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 192 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 192 = __prctl */
 	{
 		ns(struct linux_sys_rt_sigreturn_args),
 		.sy_flags = SYCALL_ARG_PTR,
Index: linux/arch/mips/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/mips/syscalls.master,v
retrieving revision 1.83
diff -u -r1.83 syscalls.master
--- linux/arch/mips/syscalls.master	1 Oct 2024 16:29:15 -0000	1.83
+++ linux/arch/mips/syscalls.master	10 Nov 2025 14:48:13 -0000
@@ -331,7 +331,8 @@
 			    gid_t sgid); }
 191	STD		{ int|linux_sys||getresgid(gid_t *rgid, gid_t *egid, \
 			    gid_t *sgid); }
-192	UNIMPL		prctl
+192	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 193	STD		{ int|linux_sys||rt_sigreturn( \
 			    struct linux_pt_regs *regs); }
 194	STD		{ int|linux_sys||rt_sigaction(int signum, \
Index: linux/arch/powerpc/linux_syscall.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/powerpc/linux_syscall.h,v
retrieving revision 1.99
diff -u -r1.99 linux_syscall.h
--- linux/arch/powerpc/linux_syscall.h	28 Sep 2024 19:36:20 -0000	1.99
+++ linux/arch/powerpc/linux_syscall.h	10 Nov 2025 14:48:13 -0000
@@ -1,10 +1,10 @@
-/* $NetBSD: linux_syscall.h,v 1.99 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call numbers.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.87 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.88 2024/10/01 16:29:15 riastradh Exp
  */
 
 #ifndef _LINUX_SYS_SYSCALL_H_
@@ -440,6 +440,9 @@
 /* syscall: "getresgid" ret: "int" args: "gid_t *" "gid_t *" "gid_t *" */
 #define	LINUX_SYS_getresgid	170
 
+/* syscall: "__prctl" ret: "int" args: "int" "..." */
+#define	LINUX_SYS___prctl	171
+
 /* syscall: "rt_sigreturn" ret: "int" args: "struct linux_rt_sigframe *" */
 #define	LINUX_SYS_rt_sigreturn	172
 
Index: linux/arch/powerpc/linux_syscallargs.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/powerpc/linux_syscallargs.h,v
retrieving revision 1.98
diff -u -r1.98 linux_syscallargs.h
--- linux/arch/powerpc/linux_syscallargs.h	28 Sep 2024 19:36:20 -0000	1.98
+++ linux/arch/powerpc/linux_syscallargs.h	10 Nov 2025 14:48:13 -0000
@@ -1,10 +1,10 @@
-/* $NetBSD: linux_syscallargs.h,v 1.98 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call argument lists.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.87 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.88 2024/10/01 16:29:15 riastradh Exp
  */
 
 #ifndef _LINUX_SYS_SYSCALLARGS_H_
@@ -579,6 +579,11 @@
 };
 check_syscall_args(linux_sys_getresgid)
 
+struct linux_sys___prctl_args {
+	syscallarg(int) code;
+	syscallarg(void *) args[SYS_MAXSYSARGS];
+};
+
 struct linux_sys_rt_sigreturn_args {
 	syscallarg(struct linux_rt_sigframe *) sfp;
 };
@@ -1609,6 +1614,8 @@
 
 int	linux_sys_getresgid(struct lwp *, const struct linux_sys_getresgid_args *, register_t *);
 
+int	linux_sys___prctl(struct lwp *, const struct linux_sys___prctl_args *, register_t *);
+
 int	linux_sys_rt_sigreturn(struct lwp *, const struct linux_sys_rt_sigreturn_args *, register_t *);
 
 int	linux_sys_rt_sigaction(struct lwp *, const struct linux_sys_rt_sigaction_args *, register_t *);
Index: linux/arch/powerpc/linux_syscalls.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/powerpc/linux_syscalls.c,v
retrieving revision 1.98
diff -u -r1.98 linux_syscalls.c
--- linux/arch/powerpc/linux_syscalls.c	28 Sep 2024 19:36:20 -0000	1.98
+++ linux/arch/powerpc/linux_syscalls.c	10 Nov 2025 14:48:14 -0000
@@ -1,14 +1,14 @@
-/* $NetBSD: linux_syscalls.c,v 1.98 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call names.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.87 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.88 2024/10/01 16:29:15 riastradh Exp
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_syscalls.c,v 1.98 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #if defined(_KERNEL_OPT)
 #include <sys/param.h>
@@ -205,7 +205,7 @@
 	/* 168 */	"#168 (unimplemented nfsservctl)",
 	/* 169 */	"setresgid",
 	/* 170 */	"getresgid",
-	/* 171 */	"#171 (unimplemented prctl)",
+	/* 171 */	"__prctl",
 	/* 172 */	"rt_sigreturn",
 	/* 173 */	"rt_sigaction",
 	/* 174 */	"rt_sigprocmask",
@@ -727,7 +727,7 @@
 	/* 168 */	NULL, /* unimplemented nfsservctl */
 	/* 169 */	NULL, /* setresgid */
 	/* 170 */	NULL, /* getresgid */
-	/* 171 */	NULL, /* unimplemented prctl */
+	/* 171 */	NULL, /* __prctl */
 	/* 172 */	NULL, /* rt_sigreturn */
 	/* 173 */	NULL, /* rt_sigaction */
 	/* 174 */	NULL, /* rt_sigprocmask */
Index: linux/arch/powerpc/linux_sysent.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/powerpc/linux_sysent.c,v
retrieving revision 1.99
diff -u -r1.99 linux_sysent.c
--- linux/arch/powerpc/linux_sysent.c	28 Sep 2024 19:36:20 -0000	1.99
+++ linux/arch/powerpc/linux_sysent.c	10 Nov 2025 14:48:14 -0000
@@ -1,14 +1,14 @@
-/* $NetBSD: linux_sysent.c,v 1.99 2024/09/28 19:36:20 christos Exp $ */
+/* $NetBSD$ */
 
 /*
  * System call switch table.
  *
  * DO NOT EDIT-- this file is automatically generated.
- * created from	NetBSD: syscalls.master,v 1.87 2024/09/28 19:35:56 christos Exp  
+ * created from	NetBSD: syscalls.master,v 1.88 2024/10/01 16:29:15 riastradh Exp
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_sysent.c,v 1.99 2024/09/28 19:36:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD$");
 
 #include <sys/param.h>
 #include <sys/poll.h>
@@ -758,8 +758,10 @@
 		.sy_call = (sy_call_t *)linux_sys_getresgid
 	},		/* 170 = getresgid */
 	{
-		.sy_call = linux_sys_nosys,
-	},		/* 171 = filler */
+		ns(struct linux_sys___prctl_args),
+		.sy_flags = SYCALL_ARG_PTR | SYCALL_INDIRECT,
+		.sy_call = (sy_call_t *)linux_sys___prctl
+	},		/* 171 = __prctl */
 	{
 		ns(struct linux_sys_rt_sigreturn_args),
 		.sy_flags = SYCALL_ARG_PTR,
Index: linux/arch/powerpc/syscalls.master
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/arch/powerpc/syscalls.master,v
retrieving revision 1.88
diff -u -r1.88 syscalls.master
--- linux/arch/powerpc/syscalls.master	1 Oct 2024 16:29:15 -0000	1.88
+++ linux/arch/powerpc/syscalls.master	10 Nov 2025 14:48:14 -0000
@@ -319,7 +319,8 @@
 			    gid_t sgid); }
 170	STD		{ int|linux_sys||getresgid(gid_t *rgid, gid_t *egid, \
 			    gid_t *sgid); }
-171	UNIMPL		prctl
+171	INDIR		{ int|linux_sys||__prctl(int code, \
+                                  ... void * args[SYS_MAXSYSARGS]); }
 172	STD		{ int|linux_sys||rt_sigreturn( \
 			    struct linux_rt_sigframe *sfp); }
 173	STD		{ int|linux_sys||rt_sigaction(int signum, \
Index: linux/common/linux_prctl.h
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/common/linux_prctl.h,v
retrieving revision 1.5
diff -u -r1.5 linux_prctl.h
--- linux/common/linux_prctl.h	1 Oct 2024 16:41:29 -0000	1.5
+++ linux/common/linux_prctl.h	10 Nov 2025 14:48:14 -0000
@@ -34,7 +34,9 @@
 #ifndef _LINUX_PRCTL_H
 #define _LINUX_PRCTL_H
 
-/* arch independent prctl(2): not yet implemented */
+/* arch independent prctl(2) */
+#define LINUX_PR_SET_NAME	15
+#define LINUX_PR_GET_NAME	16
 
 /* arch specific arch_prctl(2): only on amd64 so far */
 #if defined(__amd64__)
Index: linux/common/linux_sched.c
===================================================================
RCS file: /cvsroot/src/sys/compat/linux/common/linux_sched.c,v
retrieving revision 1.85
diff -u -r1.85 linux_sched.c
--- linux/common/linux_sched.c	19 Sep 2025 19:35:15 -0000	1.85
+++ linux/common/linux_sched.c	10 Nov 2025 14:48:14 -0000
@@ -62,6 +62,8 @@
 
 #include <compat/linux/common/linux_sched.h>
 
+#include <compat/linux/common/linux_prctl.h>
+
 static int linux_clone_nptl(struct lwp *, const struct linux_sys_clone_args *,
     register_t *);
 
@@ -782,3 +784,35 @@
 
 	return sys__sched_setaffinity(l, &ssa, retval);
 }
+
+int
+linux_sys___prctl(struct lwp *l, const struct linux_sys___prctl_args *uap,
+    register_t *retval)
+{
+	/* {
+		syscallarg(int)    code;
+		syscallarg(void *) args[SYS_MAXSYSARGS];
+	} */
+
+	unsigned int c = SCARG(uap, code);
+
+        /* TODO: add other commonly used prctl codes */
+	switch(c) {
+	case LINUX_PR_SET_NAME: {
+		struct sys__lwp_setname_args sls;
+		SCARG(&sls, name) = (char *) SCARG(uap, args[0]);
+		return sys__lwp_setname(l, &sls, retval);
+	}
+
+	case LINUX_PR_GET_NAME: {
+		struct sys__lwp_getname_args slg;
+		SCARG(&slg, name) = (char *) SCARG(uap, args[0]);
+		SCARG(&slg, len) = MAXCOMLEN;
+		return sys__lwp_getname(l, &slg, retval);
+		}
+	default:
+		printf("Unimplemented linux prctl code: (%d)", c);
+		return ENOSYS;
+	}
+
+}