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	diff --git a/share/man/man7/arch.7 b/share/man/man7/arch.7
	--- a/share/man/man7/arch.7
	+++ b/share/man/man7/arch.7
	@@ -24,7 +24,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd June 24, 2026
	+.Dd November 9, 2026
	.Dt ARCH 7
	.Os
	.Sh NAME
	@@ -271,7 +271,7 @@
	.It riscv64c Ta 4K, 2M, 1G
	.El
	.Ss User Address Space Layout
	-.Bl -column -offset indent "riscv64 (Sv48)" "0x0001000000000000" "NNNU"
	+.Bl -column -offset indent "powerpc64le (LA48)" "0x0001000000000000" "NNNU"
	.It Sy Architecture Ta Sy Maximum Address Ta Sy Address Space Size
	.It aarch64 Ta 0x0001000000000000 Ta 256TiB
	.It aarch64c Ta 0x0001000000000000 Ta 256TiB
	@@ -280,8 +280,10 @@
	.It armv7 Ta 0xbfc00000 Ta 3GiB
	.It i386 Ta 0xffc00000 Ta 4GiB
	.It powerpc Ta 0xfffff000 Ta 4GiB
	-.It powerpc64 Ta 0x000fffffc0000000 Ta 4PiB
	-.It powerpc64le Ta 0x000fffffc0000000 Ta 4PiB
	+.It powerpc64 (LA48) Ta 0x0000800000000000 Ta 128TiB
	+.It powerpc64 (LA57) Ta 0x000fffffc0000000 Ta 4PiB
	+.It powerpc64le (LA48) Ta 0x0000800000000000 Ta 128TiB
	+.It powerpc64le (LA57) Ta 0x000fffffc0000000 Ta 4PiB
	.It riscv64 (Sv39) Ta 0x0000004000000000 Ta 256GiB
	.It riscv64c (Sv39) Ta 0x0000004000000000 Ta 256GiB
	.It riscv64 (Sv48) Ta 0x0000800000000000 Ta 128TiB
	@@ -303,7 +305,7 @@
	supports 5-level paging.
	In this mode, all processes get a 48-bit address space.
	The
	-.Sy vm.pmap.prefer_la48_uva
	+.Sy vm.pmap.prefer_uva_la48
	tunable determines whether processes running on a LA57 system are limited to
	a 48-bit address space by default.
	Some applications make use of unused upper bits in pointer values to store
	@@ -316,6 +318,19 @@
	.Xr proccontrol 1
	can be used to configure the address space layout when executing a process.
	.Pp
	+On powerpc64 the radix MMU provides a 52-bit user address space, but for the
	+same reason processes are limited to 47 bits (128TiB) by default, as they are
	+on Linux.
	+The
	+.Sy vm.pmap.prefer_uva_la48
	+tunable,
	+.Xr elfctl 1
	+and
	+.Xr proccontrol 1
	+work as on amd64, with
	+.Dq la57
	+requesting the full 52-bit address space.
	+.Pp
	The RISC-V specification permits 3-level (Sv39), 4-level (Sv48), and
	5-level (Sv57) page tables.
	Hardware is only required to implement Sv39; implementations which support
	diff --git a/sys/powerpc/include/proc.h b/sys/powerpc/include/proc.h
	--- a/sys/powerpc/include/proc.h
	+++ b/sys/powerpc/include/proc.h
	@@ -45,12 +45,12 @@
	};

	struct mdproc {
	- /*
	- * Avoid empty structs because they are undefined behavior.
	- */
	- long md_spare;
	+ u_int md_flags; /* (c) md process flags P_MD */
	};

	+#define P_MD_LA48 0x00000001 /* Request LA48 after exec */
	+#define P_MD_LA57 0x00000002 /* Request LA57 after exec */
	+
	#ifdef __powerpc64__
	#define KINFO_PROC_SIZE 1088
	#define KINFO_PROC32_SIZE 816
	diff --git a/sys/powerpc/include/procctl.h b/sys/powerpc/include/procctl.h
	--- a/sys/powerpc/include/procctl.h
	+++ b/sys/powerpc/include/procctl.h
	@@ -1,3 +1,23 @@
	/*-
	* This file is in the public domain.
	*/
	+
	+#ifndef _MACHINE_PROCCTL_H_
	+#define _MACHINE_PROCCTL_H_
	+
	+/*
	+ * Same numbers as on amd64 so that proccontrol(1) works unchanged. la48
	+ * means the default 47-bit (128 TiB) user address space, la57 the full
	+ * range the MMU supports (52 bits with radix).
	+ */
	+#define PROC_LA_CTL (PROC_PROCCTL_MD_MIN + 2)
	+#define PROC_LA_STATUS (PROC_PROCCTL_MD_MIN + 3)
	+
	+#define PROC_LA_CTL_LA48_ON_EXEC 1
	+#define PROC_LA_CTL_LA57_ON_EXEC 2
	+#define PROC_LA_CTL_DEFAULT_ON_EXEC 3
	+
	+#define PROC_LA_STATUS_LA48 0x01000000
	+#define PROC_LA_STATUS_LA57 0x02000000
	+
	+#endif /* !_MACHINE_PROCCTL_H_ */
	diff --git a/sys/powerpc/include/vmparam.h b/sys/powerpc/include/vmparam.h
	--- a/sys/powerpc/include/vmparam.h
	+++ b/sys/powerpc/include/vmparam.h
	@@ -87,24 +87,44 @@
	* kernel map should be able to start at 0xc008000000000000 -
	* but at least the functional simulator doesn't like it
	*
	- * 0x0000000000000000 - 0x000fffffffffffff user map
	+ * 0x0000000000000000 - 0x00007fffffffffff user map (default)
	+ * 0x0000000000000000 - 0x000fffffffffffff user map (la57)
	* 0xc000000000000000 - 0xc007ffffffffffff direct map
	* 0xc008000000000000 - 0xc00fffffffffffff kernel map
	*
	*/
	#define VM_MIN_ADDRESS 0x0000000000000000
	-#define VM_MAXUSER_ADDRESS 0x000fffffc0000000
	+/*
	+ * Radix lets user space address 52 bits, but a process only gets the low
	+ * 47 bits (128 TiB) by default, like on amd64 with LA57 and like Linux on
	+ * ppc64le: lots of userland (SpiderMonkey, JavaScriptCore, QV4, ...) packs
	+ * pointers into 47 or 48 bits and crashes once ASLR puts the heap above
	+ * that. The full range is available per process through the la57 feature
	+ * control note or PROC_LA_CTL, see elf64_machdep.c. The LA48/LA57 names
	+ * come from that interface and amd64, they don't describe POWER paging modes.
	+ */
	+#define VM_MAXUSER_ADDRESS_LA48 0x0000800000000000
	+#define VM_MAXUSER_ADDRESS_LA57 0x000fffffc0000000
	+#define VM_MAXUSER_ADDRESS VM_MAXUSER_ADDRESS_LA57
	#define VM_MAX_ADDRESS 0xc00fffffffffffff
	#define VM_MIN_KERNEL_ADDRESS 0xc008000000000000
	#define VM_MAX_KERNEL_ADDRESS 0xc00801ffffffffff
	#define VM_MAX_SAFE_KERNEL_ADDRESS VM_MAX_KERNEL_ADDRESS
	+
	+#define SHAREDPAGE_LA48 (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE)
	+#define SHAREDPAGE_LA57 (VM_MAXUSER_ADDRESS_LA57 - PAGE_SIZE)
	+#define SHAREDPAGE SHAREDPAGE_LA48
	+#define USRSTACK_LA48 SHAREDPAGE_LA48
	+#define USRSTACK_LA57 SHAREDPAGE_LA57
	+#define PS_STRINGS_LA48 (USRSTACK_LA48 - sizeof(struct ps_strings))
	+#define PS_STRINGS_LA57 (USRSTACK_LA57 - sizeof(struct ps_strings))
	#else
	#define VM_MIN_ADDRESS 0
	#define VM_MAXUSER_ADDRESS VM_MAXUSER_ADDRESS32
	#define VM_MAX_ADDRESS 0xffffffff
	-#endif

	#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
	+#endif

	#define FREEBSD32_SHAREDPAGE (VM_MAXUSER_ADDRESS32 - PAGE_SIZE)
	#define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE
	diff --git a/sys/powerpc/powerpc/elf64_machdep.c b/sys/powerpc/powerpc/elf64_machdep.c
	--- a/sys/powerpc/powerpc/elf64_machdep.c
	+++ b/sys/powerpc/powerpc/elf64_machdep.c
	@@ -41,6 +41,7 @@
	#include <sys/jail.h>
	#include <sys/smp.h>
	#include <sys/syscall.h>
	+#include <sys/sysctl.h>
	#include <sys/signalvar.h>
	#include <sys/vnode.h>
	#include <sys/linker.h>
	@@ -61,7 +62,7 @@
	static void exec_setregs_funcdesc(struct thread td, struct image_params imgp,
	uintptr_t stack);

	-struct sysentvec elf64_freebsd_sysvec_v1 = {
	+struct sysentvec elf64_freebsd_sysvec_v1_la48 = {
	.sv_size = SYS_MAXSYSCALL,
	.sv_table = sysent,
	.sv_fixup = __elfN(freebsd_fixup),
	@@ -75,9 +76,9 @@
	.sv_elf_core_prepare_notes = __elfN(prepare_notes),
	.sv_minsigstksz = MINSIGSTKSZ,
	.sv_minuser = VM_MIN_ADDRESS,
	- .sv_maxuser = VM_MAXUSER_ADDRESS,
	- .sv_usrstack = USRSTACK,
	- .sv_psstrings = PS_STRINGS,
	+ .sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
	+ .sv_usrstack = USRSTACK_LA48,
	+ .sv_psstrings = PS_STRINGS_LA48,
	.sv_psstringssz = sizeof(struct ps_strings),
	.sv_stackprot = VM_PROT_ALL,
	.sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs),
	@@ -90,7 +91,7 @@
	.sv_set_syscall_retval = cpu_set_syscall_retval,
	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
	.sv_syscallnames = syscallnames,
	- .sv_shared_page_base = SHAREDPAGE,
	+ .sv_shared_page_base = SHAREDPAGE_LA48,
	.sv_shared_page_len = PAGE_SIZE,
	.sv_schedtail = NULL,
	.sv_thread_detach = NULL,
	@@ -105,7 +106,95 @@
	.sv_regset_end = SET_LIMIT(__elfN(regset)),
	};

	-struct sysentvec elf64_freebsd_sysvec_v2 = {
	+struct sysentvec elf64_freebsd_sysvec_v1_la57 = {
	+ .sv_size = SYS_MAXSYSCALL,
	+ .sv_table = sysent,
	+ .sv_fixup = __elfN(freebsd_fixup),
	+ .sv_sendsig = sendsig,
	+ .sv_sigcode = sigcode64,
	+ .sv_szsigcode = &szsigcode64,
	+ .sv_name = "FreeBSD ELF64",
	+ .sv_coredump = __elfN(coredump),
	+ .sv_elf_core_osabi = ELFOSABI_FREEBSD,
	+ .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
	+ .sv_elf_core_prepare_notes = __elfN(prepare_notes),
	+ .sv_minsigstksz = MINSIGSTKSZ,
	+ .sv_minuser = VM_MIN_ADDRESS,
	+ .sv_maxuser = VM_MAXUSER_ADDRESS_LA57,
	+ .sv_usrstack = USRSTACK_LA57,
	+ .sv_psstrings = PS_STRINGS_LA57,
	+ .sv_psstringssz = sizeof(struct ps_strings),
	+ .sv_stackprot = VM_PROT_ALL,
	+ .sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs),
	+ .sv_copyout_strings = exec_copyout_strings,
	+ .sv_setregs = exec_setregs_funcdesc,
	+ .sv_fixlimit = NULL,
	+ .sv_maxssiz = NULL,
	+ .sv_flags = SV_ABI_FREEBSD \| SV_LP64 \| SV_SHP \| SV_ASLR \|
	+ SV_TIMEKEEP \| SV_RNG_SEED_VER \| SV_SIGSYS,
	+ .sv_set_syscall_retval = cpu_set_syscall_retval,
	+ .sv_fetch_syscall_args = cpu_fetch_syscall_args,
	+ .sv_syscallnames = syscallnames,
	+ .sv_shared_page_base = SHAREDPAGE_LA57,
	+ .sv_shared_page_len = PAGE_SIZE,
	+ .sv_schedtail = NULL,
	+ .sv_thread_detach = NULL,
	+ .sv_trap = NULL,
	+ .sv_hwcap = &cpu_features,
	+ .sv_hwcap2 = &cpu_features2,
	+ .sv_hwcap3 = NULL,
	+ .sv_hwcap4 = NULL,
	+ .sv_onexec_old = exec_onexec_old,
	+ .sv_onexit = exit_onexit,
	+ .sv_regset_begin = SET_BEGIN(__elfN(regset)),
	+ .sv_regset_end = SET_LIMIT(__elfN(regset)),
	+};
	+
	+struct sysentvec elf64_freebsd_sysvec_v2_la48 = {
	+ .sv_size = SYS_MAXSYSCALL,
	+ .sv_table = sysent,
	+ .sv_fixup = __elfN(freebsd_fixup),
	+ .sv_sendsig = sendsig,
	+ .sv_sigcode = sigcode64, /* Fixed up in ppc64_init_sysvecs(). */
	+ .sv_szsigcode = &szsigcode64,
	+ .sv_name = "FreeBSD ELF64 V2",
	+ .sv_coredump = __elfN(coredump),
	+ .sv_elf_core_osabi = ELFOSABI_FREEBSD,
	+ .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
	+ .sv_elf_core_prepare_notes = __elfN(prepare_notes),
	+ .sv_minsigstksz = MINSIGSTKSZ,
	+ .sv_minuser = VM_MIN_ADDRESS,
	+ .sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
	+ .sv_usrstack = USRSTACK_LA48,
	+ .sv_psstrings = PS_STRINGS_LA48,
	+ .sv_psstringssz = sizeof(struct ps_strings),
	+ .sv_stackprot = VM_PROT_ALL,
	+ .sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs),
	+ .sv_copyout_strings = exec_copyout_strings,
	+ .sv_setregs = exec_setregs,
	+ .sv_fixlimit = NULL,
	+ .sv_maxssiz = NULL,
	+ .sv_flags = SV_ABI_FREEBSD \| SV_LP64 \| SV_SHP \| SV_ASLR \|
	+ SV_TIMEKEEP \| SV_RNG_SEED_VER \| SV_SIGSYS,
	+ .sv_set_syscall_retval = cpu_set_syscall_retval,
	+ .sv_fetch_syscall_args = cpu_fetch_syscall_args,
	+ .sv_syscallnames = syscallnames,
	+ .sv_shared_page_base = SHAREDPAGE_LA48,
	+ .sv_shared_page_len = PAGE_SIZE,
	+ .sv_schedtail = NULL,
	+ .sv_thread_detach = NULL,
	+ .sv_trap = NULL,
	+ .sv_hwcap = &cpu_features,
	+ .sv_hwcap2 = &cpu_features2,
	+ .sv_hwcap3 = NULL,
	+ .sv_hwcap4 = NULL,
	+ .sv_onexec_old = exec_onexec_old,
	+ .sv_onexit = exit_onexit,
	+ .sv_regset_begin = SET_BEGIN(__elfN(regset)),
	+ .sv_regset_end = SET_LIMIT(__elfN(regset)),
	+};
	+
	+struct sysentvec elf64_freebsd_sysvec_v2_la57 = {
	.sv_size = SYS_MAXSYSCALL,
	.sv_table = sysent,
	.sv_fixup = __elfN(freebsd_fixup),
	@@ -119,9 +208,9 @@
	.sv_elf_core_prepare_notes = __elfN(prepare_notes),
	.sv_minsigstksz = MINSIGSTKSZ,
	.sv_minuser = VM_MIN_ADDRESS,
	- .sv_maxuser = VM_MAXUSER_ADDRESS,
	- .sv_usrstack = USRSTACK,
	- .sv_psstrings = PS_STRINGS,
	+ .sv_maxuser = VM_MAXUSER_ADDRESS_LA57,
	+ .sv_usrstack = USRSTACK_LA57,
	+ .sv_psstrings = PS_STRINGS_LA57,
	.sv_psstringssz = sizeof(struct ps_strings),
	.sv_stackprot = VM_PROT_ALL,
	.sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs),
	@@ -134,7 +223,7 @@
	.sv_set_syscall_retval = cpu_set_syscall_retval,
	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
	.sv_syscallnames = syscallnames,
	- .sv_shared_page_base = SHAREDPAGE,
	+ .sv_shared_page_base = SHAREDPAGE_LA57,
	.sv_shared_page_len = PAGE_SIZE,
	.sv_schedtail = NULL,
	.sv_thread_detach = NULL,
	@@ -151,47 +240,82 @@

	static bool ppc64_elfv1_header_match(const struct image_params *params,
	const int32_t , const uint32_t );
	+static bool ppc64_elfv1_la57_header_match(const struct image_params *params,
	+ const int32_t , const uint32_t );
	static bool ppc64_elfv2_header_match(const struct image_params *params,
	const int32_t , const uint32_t );
	+static bool ppc64_elfv2_la57_header_match(const struct image_params *params,
	+ const int32_t , const uint32_t );

	-static const Elf64_Brandinfo freebsd_brand_info_elfv1 = {
	+static const Elf64_Brandinfo freebsd_brand_info_elfv1_la48 = {
	.brand = ELFOSABI_FREEBSD,
	.machine = EM_PPC64,
	.compat_3_brand = "FreeBSD",
	.interp_path = "/libexec/ld-elf.so.1",
	- .sysvec = &elf64_freebsd_sysvec_v1,
	+ .sysvec = &elf64_freebsd_sysvec_v1_la48,
	.interp_newpath = NULL,
	.brand_note = &elf64_freebsd_brandnote,
	.flags = BI_CAN_EXEC_DYN \| BI_BRAND_NOTE,
	.header_supported = &ppc64_elfv1_header_match
	};

	-C_SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY,
	- (sysinit_cfunc_t) elf64_insert_brand_entry,
	- &freebsd_brand_info_elfv1);
	+static const Elf64_Brandinfo freebsd_brand_info_elfv1_la57 = {
	+ .brand = ELFOSABI_FREEBSD,
	+ .machine = EM_PPC64,
	+ .compat_3_brand = "FreeBSD",
	+ .interp_path = "/libexec/ld-elf.so.1",
	+ .sysvec = &elf64_freebsd_sysvec_v1_la57,
	+ .interp_newpath = NULL,
	+ .brand_note = &elf64_freebsd_brandnote,
	+ .flags = BI_CAN_EXEC_DYN \| BI_BRAND_NOTE,
	+ .header_supported = &ppc64_elfv1_la57_header_match
	+};

	-static const Elf64_Brandinfo freebsd_brand_info_elfv2 = {
	+static const Elf64_Brandinfo freebsd_brand_info_elfv2_la48 = {
	.brand = ELFOSABI_FREEBSD,
	.machine = EM_PPC64,
	.compat_3_brand = "FreeBSD",
	.interp_path = "/libexec/ld-elf.so.1",
	- .sysvec = &elf64_freebsd_sysvec_v2,
	+ .sysvec = &elf64_freebsd_sysvec_v2_la48,
	.interp_newpath = NULL,
	.brand_note = &elf64_freebsd_brandnote,
	.flags = BI_CAN_EXEC_DYN \| BI_BRAND_NOTE,
	.header_supported = &ppc64_elfv2_header_match
	};

	-C_SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY,
	- (sysinit_cfunc_t) elf64_insert_brand_entry,
	- &freebsd_brand_info_elfv2);
	+static const Elf64_Brandinfo freebsd_brand_info_elfv2_la57 = {
	+ .brand = ELFOSABI_FREEBSD,
	+ .machine = EM_PPC64,
	+ .compat_3_brand = "FreeBSD",
	+ .interp_path = "/libexec/ld-elf.so.1",
	+ .sysvec = &elf64_freebsd_sysvec_v2_la57,
	+ .interp_newpath = NULL,
	+ .brand_note = &elf64_freebsd_brandnote,
	+ .flags = BI_CAN_EXEC_DYN \| BI_BRAND_NOTE,
	+ .header_supported = &ppc64_elfv2_la57_header_match
	+};
	+
	+static void
	+ppc64_register_brand_entries(void *arg __unused)
	+{
	+ /*
	+ * The la57 entries must go first so they can either claim the
	+ * image or hand it to the la48 ones.
	+ */
	+ elf64_insert_brand_entry(&freebsd_brand_info_elfv2_la57);
	+ elf64_insert_brand_entry(&freebsd_brand_info_elfv2_la48);
	+ elf64_insert_brand_entry(&freebsd_brand_info_elfv1_la57);
	+ elf64_insert_brand_entry(&freebsd_brand_info_elfv1_la48);
	+}
	+SYSINIT(elf64_brands, SI_SUB_EXEC, SI_ORDER_FIRST,
	+ ppc64_register_brand_entries, NULL);

	static const Elf64_Brandinfo freebsd_brand_oinfo = {
	.brand = ELFOSABI_FREEBSD,
	.machine = EM_PPC64,
	.compat_3_brand = "FreeBSD",
	.interp_path = "/usr/libexec/ld-elf.so.1",
	- .sysvec = &elf64_freebsd_sysvec_v1,
	+ .sysvec = &elf64_freebsd_sysvec_v1_la48,
	.interp_newpath = NULL,
	.brand_note = &elf64_freebsd_brandnote,
	.flags = BI_CAN_EXEC_DYN \| BI_BRAND_NOTE,
	@@ -207,20 +331,27 @@
	static void
	ppc64_init_sysvecs(void *arg)
	{
	- exec_sysvec_init(&elf64_freebsd_sysvec_v2);
	- exec_sysvec_init_secondary(&elf64_freebsd_sysvec_v2,
	- &elf64_freebsd_sysvec_v1);
	+ exec_sysvec_init(&elf64_freebsd_sysvec_v2_la48);
	+ exec_sysvec_init_secondary(&elf64_freebsd_sysvec_v2_la48,
	+ &elf64_freebsd_sysvec_v2_la57);
	+ exec_sysvec_init_secondary(&elf64_freebsd_sysvec_v2_la48,
	+ &elf64_freebsd_sysvec_v1_la48);
	+ exec_sysvec_init_secondary(&elf64_freebsd_sysvec_v2_la48,
	+ &elf64_freebsd_sysvec_v1_la57);
	/*
	- * Adjust elfv2 sigcode after elfv1 sysvec is initialized.
	+ * Adjust elfv2 sigcode after the elfv1 sysvecs are initialized.
	* exec_sysvec_init_secondary() assumes secondary sysvecs use
	* identical signal code, and skips allocating a second copy.
	* Since the ELFv2 trampoline is a strict subset of the ELFv1 code,
	* we can work around this by adjusting the offset. This also
	* avoids two copies of the trampoline code being allocated!
	*/
	- elf64_freebsd_sysvec_v2.sv_sigcode_offset +=
	+ elf64_freebsd_sysvec_v2_la48.sv_sigcode_offset +=
	(uintptr_t)sigcode64_elfv2 - (uintptr_t)&sigcode64;
	- elf64_freebsd_sysvec_v2.sv_szsigcode = &szsigcode64_elfv2;
	+ elf64_freebsd_sysvec_v2_la48.sv_szsigcode = &szsigcode64_elfv2;
	+ elf64_freebsd_sysvec_v2_la57.sv_sigcode_offset +=
	+ (uintptr_t)sigcode64_elfv2 - (uintptr_t)&sigcode64;
	+ elf64_freebsd_sysvec_v2_la57.sv_szsigcode = &szsigcode64_elfv2;
	}
	SYSINIT(elf64_sysvec, SI_SUB_EXEC, SI_ORDER_ANY, ppc64_init_sysvecs, NULL);

	@@ -244,6 +375,50 @@
	return (abi == 2);
	}

	+/*
	+ * Processes get a 47-bit address space by default, see vmparam.h. The full
	+ * 52 bits are available through the la57 feature control note or
	+ * PROC_LA_CTL; vm.pmap.prefer_uva_la48 flips the default like on amd64.
	+ */
	+static int prefer_uva_la48 = 1;
	+SYSCTL_DECL(_vm_pmap);
	+SYSCTL_INT(_vm_pmap, OID_AUTO, prefer_uva_la48, CTLFLAG_RDTUN,
	+ &prefer_uva_la48, 0,
	+ "Userspace maps are limited to LA48 unless otherwise configured");
	+
	+static bool
	+ppc64_la57_img_compat(const struct image_params imgp, const uint32_t fctl0)
	+{
	+
	+ if ((imgp->proc->p_md.md_flags & P_MD_LA57) != 0)
	+ return (true);
	+ if (fctl0 != NULL && (*fctl0 & NT_FREEBSD_FCTL_LA57) != 0)
	+ return (true);
	+ if (fctl0 == NULL \|\| (*fctl0 & NT_FREEBSD_FCTL_LA48) != 0)
	+ return (false);
	+ if ((imgp->proc->p_md.md_flags & P_MD_LA48) != 0)
	+ return (false);
	+ return (!prefer_uva_la48);
	+}
	+
	+static bool
	+ppc64_elfv1_la57_header_match(const struct image_params *params,
	+ const int32_t osrel, const uint32_t fctl0)
	+{
	+
	+ return (ppc64_elfv1_header_match(params, osrel, fctl0) &&
	+ ppc64_la57_img_compat(params, fctl0));
	+}
	+
	+static bool
	+ppc64_elfv2_la57_header_match(const struct image_params *params,
	+ const int32_t osrel, const uint32_t fctl0)
	+{
	+
	+ return (ppc64_elfv2_header_match(params, osrel, fctl0) &&
	+ ppc64_la57_img_compat(params, fctl0));
	+}
	+
	static void
	exec_setregs_funcdesc(struct thread td, struct image_params imgp,
	uintptr_t stack)
	diff --git a/sys/powerpc/powerpc/exec_machdep.c b/sys/powerpc/powerpc/exec_machdep.c
	--- a/sys/powerpc/powerpc/exec_machdep.c
	+++ b/sys/powerpc/powerpc/exec_machdep.c
	@@ -128,7 +128,8 @@
	static void cleanup_power_extras(struct thread *);

	#ifdef __powerpc64__
	-extern struct sysentvec elf64_freebsd_sysvec_v2;
	+extern struct sysentvec elf64_freebsd_sysvec_v2_la48;
	+extern struct sysentvec elf64_freebsd_sysvec_v2_la57;
	#endif

	#ifdef __powerpc64__
	@@ -1192,7 +1193,8 @@
	#endif
	} else {
	#ifdef __powerpc64__
	- if (td->td_proc->p_sysent == &elf64_freebsd_sysvec_v2) {
	+ if (td->td_proc->p_sysent == &elf64_freebsd_sysvec_v2_la48 \|\|
	+ td->td_proc->p_sysent == &elf64_freebsd_sysvec_v2_la57) {
	tf->srr0 = (register_t)entry;
	/* ELFv2 ABI requires that the global entry point be in r12. */
	tf->fixreg[12] = (register_t)entry;
	diff --git a/sys/powerpc/powerpc/vm_machdep.c b/sys/powerpc/powerpc/vm_machdep.c
	--- a/sys/powerpc/powerpc/vm_machdep.c
	+++ b/sys/powerpc/powerpc/vm_machdep.c
	@@ -79,9 +79,11 @@
	#include <sys/vmmeter.h>
	#include <sys/kernel.h>
	#include <sys/mbuf.h>
	+#include <sys/procctl.h>
	#include <sys/sysctl.h>
	#include <sys/sysent.h>
	#include <sys/unistd.h>
	+#include <sys/wait.h>

	#include <machine/cpu.h>
	#include <machine/fpu.h>
	@@ -128,6 +130,9 @@
	/* Copy the pcb */
	bcopy(td1->td_pcb, pcb, sizeof(struct pcb));

	+ /* Inherit the machine-dependent process flags. */
	+ bcopy(&td1->td_proc->p_md, &p2->p_md, sizeof(p2->p_md));
	+
	/*
	* Create a fresh stack for the new process.
	* Copy the trap frame for the return to user mode as if from a
	@@ -214,12 +219,89 @@
	return (true);
	}

	+#ifdef __powerpc64__
	+static void
	+cpu_procctl_la_ctl(struct proc *p, int val)
	+{
	+
	+ switch (val) {
	+ case PROC_LA_CTL_LA48_ON_EXEC:
	+ p->p_md.md_flags \|= P_MD_LA48;
	+ p->p_md.md_flags &= ~P_MD_LA57;
	+ break;
	+ case PROC_LA_CTL_LA57_ON_EXEC:
	+ p->p_md.md_flags &= ~P_MD_LA48;
	+ p->p_md.md_flags \|= P_MD_LA57;
	+ break;
	+ case PROC_LA_CTL_DEFAULT_ON_EXEC:
	+ p->p_md.md_flags &= ~(P_MD_LA48 \| P_MD_LA57);
	+ break;
	+ }
	+}
	+
	+static void
	+cpu_procctl_la_status(struct proc p, int val)
	+{
	+ int res;
	+
	+ if ((p->p_md.md_flags & P_MD_LA48) != 0)
	+ res = PROC_LA_CTL_LA48_ON_EXEC;
	+ else if ((p->p_md.md_flags & P_MD_LA57) != 0)
	+ res = PROC_LA_CTL_LA57_ON_EXEC;
	+ else
	+ res = PROC_LA_CTL_DEFAULT_ON_EXEC;
	+ if (p->p_sysent->sv_maxuser <= VM_MAXUSER_ADDRESS_LA48)
	+ res \|= PROC_LA_STATUS_LA48;
	+ else
	+ res \|= PROC_LA_STATUS_LA57;
	+ *val = res;
	+}
	+#endif
	+
	int
	-cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
	- int com __unused, void *data __unused)
	+cpu_procctl(struct thread td, int idtype, id_t id, int com, void data)
	{
	+#ifdef __powerpc64__
	+ struct proc *p;
	+ int error, val;

	+ switch (com) {
	+ case PROC_LA_CTL:
	+ case PROC_LA_STATUS:
	+ if (idtype != P_PID) {
	+ error = EINVAL;
	+ break;
	+ }
	+ if (com == PROC_LA_CTL) {
	+ error = copyin(data, &val, sizeof(val));
	+ if (error != 0)
	+ break;
	+ if (val != PROC_LA_CTL_LA48_ON_EXEC &&
	+ val != PROC_LA_CTL_LA57_ON_EXEC &&
	+ val != PROC_LA_CTL_DEFAULT_ON_EXEC) {
	+ error = EINVAL;
	+ break;
	+ }
	+ }
	+ error = pget(id, PGET_CANSEE \| PGET_NOTWEXIT \| PGET_NOTID, &p);
	+ if (error != 0)
	+ break;
	+ if (com == PROC_LA_CTL)
	+ cpu_procctl_la_ctl(p, val);
	+ else
	+ cpu_procctl_la_status(p, &val);
	+ PROC_UNLOCK(p);
	+ if (com == PROC_LA_STATUS)
	+ error = copyout(&val, data, sizeof(val));
	+ break;
	+ default:
	+ error = EINVAL;
	+ break;
	+ }
	+ return (error);
	+#else
	return (EINVAL);
	+#endif
	}

	void
	diff --git a/usr.bin/elfctl/elfctl.1 b/usr.bin/elfctl/elfctl.1
	--- a/usr.bin/elfctl/elfctl.1
	+++ b/usr.bin/elfctl/elfctl.1
	@@ -24,7 +24,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd October 5, 2023
	+.Dd November 9, 2026
	.Dt ELFCTL 1
	.Os
	.Sh NAME
	@@ -97,7 +97,7 @@
	.Ed
	.Sh NOTES
	On amd64, on a machine with LA57 (5-level paging) mode supported and
	-enabled, if both
	+enabled, and on powerpc64, if both
	.Va la57
	and
	.Va la48
	@@ -109,6 +109,10 @@
	.Va vm.pmap.prefer_uva_la48
	sysctl MIB defines the default user address space size for binaries
	which do not set either of these flags.
	+On powerpc64,
	+.Va la57
	+gives the process the full 52-bit address space of the radix MMU instead
	+of the default 47 bits.
	.Sh SEE ALSO
	.Xr mitigations 7
	.Sh HISTORY
	diff --git a/usr.bin/elfctl/elfctl.c b/usr.bin/elfctl/elfctl.c
	--- a/usr.bin/elfctl/elfctl.c
	+++ b/usr.bin/elfctl/elfctl.c
	@@ -68,9 +68,10 @@
	{ "nostackgap", NT_FREEBSD_FCTL_STKGAP_DISABLE, "Disable stack gap" },
	{ "wxneeded", NT_FREEBSD_FCTL_WXNEEDED, "Requires W+X mappings" },
	{ "la48", NT_FREEBSD_FCTL_LA48,
	- "amd64: Limit user virtual addresses to 48 bits" },
	+ "amd64, powerpc64: Limit user virtual addresses to 48 bits" },
	{ "la57", NT_FREEBSD_FCTL_LA57,
	- "amd64: Allow the use of 57-bit virtual addresses when available" },
	+ "amd64, powerpc64: Allow the use of 57-bit (52-bit on powerpc64) "
	+ "virtual addresses when available" },
	};

	static struct option long_opts[] = {
	diff --git a/usr.bin/proccontrol/proccontrol.1 b/usr.bin/proccontrol/proccontrol.1
	--- a/usr.bin/proccontrol/proccontrol.1
	+++ b/usr.bin/proccontrol/proccontrol.1
	@@ -25,7 +25,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd December 14, 2024
	+.Dd November 9, 2026
	.Dt PROCCONTROL 1
	.Os
	.Sh NAME
	@@ -77,8 +77,12 @@
	.It Ar kpti
	Controls the KPTI enable, AMD64 only.
	.It Ar la48
	-Control limiting usermode process address space to 48 bits of address,
	-AMD64 only, on machines capable of 57-bit addressing.
	+Control limiting usermode process address space to 48 bits of address.
	+AMD64, on machines capable of 57-bit addressing, and powerpc64 only.
	+.It Ar la57
	+Control the use of the full address space the machine is capable of,
	+57 bits on AMD64 and 52 bits on powerpc64.
	+AMD64 and powerpc64 only.
	.It Ar logsigexit
	Controls the logging of exits due to a signal that would normally cause a core
	dump.

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