summaryrefslogtreecommitdiff
path: root/arch/s390/kernel/vdso
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel/vdso')
-rw-r--r--arch/s390/kernel/vdso/.gitignore2
-rw-r--r--arch/s390/kernel/vdso/Makefile76
-rwxr-xr-xarch/s390/kernel/vdso/gen_vdso_offsets.sh15
-rw-r--r--arch/s390/kernel/vdso/getcpu.c21
-rw-r--r--arch/s390/kernel/vdso/note.S13
-rw-r--r--arch/s390/kernel/vdso/vdso.h15
-rw-r--r--arch/s390/kernel/vdso/vdso.lds.S113
-rw-r--r--arch/s390/kernel/vdso/vdso_generic.c19
-rw-r--r--arch/s390/kernel/vdso/vdso_user_wrapper.S52
-rw-r--r--arch/s390/kernel/vdso/vdso_wrapper.S15
-rw-r--r--arch/s390/kernel/vdso/vgetrandom-chacha.S181
-rw-r--r--arch/s390/kernel/vdso/vgetrandom.c14
12 files changed, 536 insertions, 0 deletions
diff --git a/arch/s390/kernel/vdso/.gitignore b/arch/s390/kernel/vdso/.gitignore
new file mode 100644
index 000000000000..652e31d82582
--- /dev/null
+++ b/arch/s390/kernel/vdso/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+vdso.lds
diff --git a/arch/s390/kernel/vdso/Makefile b/arch/s390/kernel/vdso/Makefile
new file mode 100644
index 000000000000..2fa12d4ac106
--- /dev/null
+++ b/arch/s390/kernel/vdso/Makefile
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: GPL-2.0
+# List of files in the vdso
+
+# Include the generic Makefile to check the built vdso.
+include $(srctree)/lib/vdso/Makefile.include
+obj-vdso = vdso_user_wrapper.o note.o vgetrandom-chacha.o
+obj-cvdso = vdso_generic.o getcpu.o vgetrandom.o
+VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE)
+CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE)
+CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE)
+CFLAGS_REMOVE_vdso_generic.o = $(VDSO_CFLAGS_REMOVE)
+
+ifneq ($(c-getrandom-y),)
+ CFLAGS_vgetrandom.o += -include $(c-getrandom-y)
+endif
+
+# Build rules
+
+targets := $(obj-vdso) $(obj-cvdso) vdso.so vdso.so.dbg
+obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
+obj-cvdso := $(addprefix $(obj)/, $(obj-cvdso))
+
+KBUILD_AFLAGS_VDSO := $(KBUILD_AFLAGS) -DBUILD_VDSO
+
+KBUILD_CFLAGS_VDSO := $(KBUILD_CFLAGS) -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
+KBUILD_CFLAGS_VDSO := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_VDSO))
+KBUILD_CFLAGS_VDSO := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_VDSO))
+KBUILD_CFLAGS_VDSO := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_VDSO))
+KBUILD_CFLAGS_VDSO := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_VDSO))
+KBUILD_CFLAGS_VDSO += -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables
+KBUILD_CFLAGS_VDSO += -fno-stack-protector
+ldflags-y := -shared -soname=linux-vdso.so.1 \
+ --hash-style=both --build-id=sha1 -T
+
+$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_VDSO)
+$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_VDSO)
+
+obj-y += vdso_wrapper.o
+targets += vdso.lds
+CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+
+# Force dependency (incbin is bad)
+$(obj)/vdso_wrapper.o : $(obj)/vdso.so
+
+quiet_cmd_vdso_and_check = VDSO $@
+ cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)
+
+# link rule for the .so file, .lds has to be first
+$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) $(obj-cvdso) FORCE
+ $(call if_changed,vdso_and_check)
+
+# strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+ $(call if_changed,objcopy)
+
+# assembly rules for the .S files
+$(obj-vdso): %.o: %.S FORCE
+ $(call if_changed_dep,vdsoas)
+
+$(obj-cvdso): %.o: %.c FORCE
+ $(call if_changed_dep,vdsocc)
+
+# actual build commands
+quiet_cmd_vdsoas = VDSOA $@
+ cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
+quiet_cmd_vdsocc = VDSOC $@
+ cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $<
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+ cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+
+include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
+ $(call if_changed,vdsosym)
diff --git a/arch/s390/kernel/vdso/gen_vdso_offsets.sh b/arch/s390/kernel/vdso/gen_vdso_offsets.sh
new file mode 100755
index 000000000000..359982fb002d
--- /dev/null
+++ b/arch/s390/kernel/vdso/gen_vdso_offsets.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+#
+# Match symbols in the DSO that look like VDSO_*; produce a header file
+# of constant offsets into the shared object.
+#
+# Doing this inside the Makefile will break the $(filter-out) function,
+# causing Kbuild to rebuild the vdso-offsets header file every time.
+#
+# Inspired by arm64 version.
+#
+
+LC_ALL=C
+sed -n 's/\([0-9a-f]*\) . __kernel_\(.*\)/\#define vdso_offset_\2\t0x\1/p'
diff --git a/arch/s390/kernel/vdso/getcpu.c b/arch/s390/kernel/vdso/getcpu.c
new file mode 100644
index 000000000000..5c5d4a848b76
--- /dev/null
+++ b/arch/s390/kernel/vdso/getcpu.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright IBM Corp. 2020 */
+
+#include <linux/compiler.h>
+#include <linux/getcpu.h>
+#include <asm/timex.h>
+#include "vdso.h"
+
+int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
+{
+ union tod_clock clk;
+
+ /* CPU number is stored in the programmable field of the TOD clock */
+ store_tod_clock_ext(&clk);
+ if (cpu)
+ *cpu = clk.pf;
+ /* NUMA node is always zero */
+ if (node)
+ *node = 0;
+ return 0;
+}
diff --git a/arch/s390/kernel/vdso/note.S b/arch/s390/kernel/vdso/note.S
new file mode 100644
index 000000000000..db19d0680a0a
--- /dev/null
+++ b/arch/s390/kernel/vdso/note.S
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+ .long LINUX_VERSION_CODE
+ELFNOTE_END
diff --git a/arch/s390/kernel/vdso/vdso.h b/arch/s390/kernel/vdso/vdso.h
new file mode 100644
index 000000000000..8cff033dd854
--- /dev/null
+++ b/arch/s390/kernel/vdso/vdso.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ARCH_S390_KERNEL_VDSO_VDSO_H
+#define __ARCH_S390_KERNEL_VDSO_VDSO_H
+
+#include <vdso/datapage.h>
+
+struct getcpu_cache;
+
+int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused);
+int __s390_vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
+int __s390_vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
+int __s390_vdso_clock_getres(clockid_t clock, struct __kernel_timespec *ts);
+ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
+
+#endif /* __ARCH_S390_KERNEL_VDSO_VDSO_H */
diff --git a/arch/s390/kernel/vdso/vdso.lds.S b/arch/s390/kernel/vdso/vdso.lds.S
new file mode 100644
index 000000000000..7bec4de0e8e0
--- /dev/null
+++ b/arch/s390/kernel/vdso/vdso.lds.S
@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This is the infamous ld script for the 64 bits vdso
+ * library
+ */
+
+#include <asm/vdso/vsyscall.h>
+#include <asm/page.h>
+#include <asm/vdso.h>
+#include <asm-generic/vmlinux.lds.h>
+#include <vdso/datapage.h>
+
+OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
+OUTPUT_ARCH(s390:64-bit)
+
+SECTIONS
+{
+ VDSO_VVAR_SYMS
+
+ . = SIZEOF_HEADERS;
+
+ .hash : { *(.hash) } :text
+ .gnu.hash : { *(.gnu.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+
+ .note : { *(.note.*) } :text :note
+
+ . = ALIGN(16);
+ .text : {
+ *(.text .stub .text.* .gnu.linkonce.t.*)
+ } :text
+ PROVIDE(__etext = .);
+ PROVIDE(_etext = .);
+ PROVIDE(etext = .);
+
+ /*
+ * Other stuff is appended to the text segment:
+ */
+ .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+ .rodata1 : { *(.rodata1) }
+
+ . = ALIGN(8);
+ .altinstructions : { *(.altinstructions) }
+ .altinstr_replacement : { *(.altinstr_replacement) }
+
+ .dynamic : { *(.dynamic) } :text :dynamic
+
+ .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
+ .eh_frame : { KEEP (*(.eh_frame)) } :text
+ .gcc_except_table : { *(.gcc_except_table .gcc_except_table.*) }
+
+ .rela.dyn ALIGN(8) : { *(.rela.dyn) }
+ .got ALIGN(8) : { *(.got .toc) }
+ .got.plt ALIGN(8) : { *(.got.plt) }
+
+ _end = .;
+ PROVIDE(end = .);
+
+ STABS_DEBUG
+ DWARF_DEBUG
+ .comment 0 : { *(.comment) }
+ .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
+
+ /DISCARD/ : {
+ *(.note.GNU-stack)
+ *(.branch_lt)
+ *(.data .data.* .gnu.linkonce.d.* .sdata*)
+ *(.bss .sbss .dynbss .dynsbss)
+ }
+}
+
+/*
+ * Very old versions of ld do not recognize this name token; use the constant.
+ */
+#define PT_GNU_EH_FRAME 0x6474e550
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+ text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
+ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+ note PT_NOTE FLAGS(4); /* PF_R */
+ eh_frame_hdr PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+ VDSO_VERSION_STRING {
+ global:
+ /*
+ * Has to be there for the kernel to find
+ */
+ __kernel_gettimeofday;
+ __kernel_clock_gettime;
+ __kernel_clock_getres;
+ __kernel_getcpu;
+ __kernel_restart_syscall;
+ __kernel_rt_sigreturn;
+ __kernel_sigreturn;
+ __kernel_getrandom;
+ local: *;
+ };
+}
diff --git a/arch/s390/kernel/vdso/vdso_generic.c b/arch/s390/kernel/vdso/vdso_generic.c
new file mode 100644
index 000000000000..a9aa75643c08
--- /dev/null
+++ b/arch/s390/kernel/vdso/vdso_generic.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "../../../../lib/vdso/gettimeofday.c"
+#include "vdso.h"
+
+int __s390_vdso_gettimeofday(struct __kernel_old_timeval *tv,
+ struct timezone *tz)
+{
+ return __cvdso_gettimeofday(tv, tz);
+}
+
+int __s390_vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
+{
+ return __cvdso_clock_gettime(clock, ts);
+}
+
+int __s390_vdso_clock_getres(clockid_t clock, struct __kernel_timespec *ts)
+{
+ return __cvdso_clock_getres(clock, ts);
+}
diff --git a/arch/s390/kernel/vdso/vdso_user_wrapper.S b/arch/s390/kernel/vdso/vdso_user_wrapper.S
new file mode 100644
index 000000000000..aa06c85bcbd3
--- /dev/null
+++ b/arch/s390/kernel/vdso/vdso_user_wrapper.S
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/linkage.h>
+#include <asm/vdso.h>
+#include <asm/unistd.h>
+#include <asm/asm-offsets.h>
+#include <asm/dwarf.h>
+#include <asm/ptrace.h>
+
+/*
+ * Older glibc version called vdso without allocating a stackframe. This wrapper
+ * is just used to allocate a stackframe. See
+ * https://sourceware.org/git/?p=glibc.git;a=commit;h=478593e6374f3818da39332260dc453cb19cfa1e
+ * for details.
+ */
+.macro vdso_func func
+SYM_FUNC_START(__kernel_\func)
+ CFI_STARTPROC
+ aghi %r15,-STACK_FRAME_VDSO_OVERHEAD
+ CFI_DEF_CFA_OFFSET (STACK_FRAME_USER_OVERHEAD + STACK_FRAME_VDSO_OVERHEAD)
+ CFI_VAL_OFFSET 15,-STACK_FRAME_USER_OVERHEAD
+ stg %r14,__SFVDSO_RETURN_ADDRESS(%r15)
+ CFI_REL_OFFSET 14,__SFVDSO_RETURN_ADDRESS
+ xc __SFUSER_BACKCHAIN(8,%r15),__SFUSER_BACKCHAIN(%r15)
+ brasl %r14,__s390_vdso_\func
+ lg %r14,__SFVDSO_RETURN_ADDRESS(%r15)
+ CFI_RESTORE 14
+ aghi %r15,STACK_FRAME_VDSO_OVERHEAD
+ CFI_DEF_CFA_OFFSET STACK_FRAME_USER_OVERHEAD
+ CFI_RESTORE 15
+ br %r14
+ CFI_ENDPROC
+SYM_FUNC_END(__kernel_\func)
+.endm
+
+vdso_func gettimeofday
+vdso_func clock_getres
+vdso_func clock_gettime
+vdso_func getcpu
+
+.macro vdso_syscall func,syscall
+SYM_FUNC_START(__kernel_\func)
+ CFI_STARTPROC
+ svc \syscall
+ /* Make sure we notice when a syscall returns, which shouldn't happen */
+ .word 0
+ CFI_ENDPROC
+SYM_FUNC_END(__kernel_\func)
+.endm
+
+vdso_syscall restart_syscall,__NR_restart_syscall
+vdso_syscall sigreturn,__NR_sigreturn
+vdso_syscall rt_sigreturn,__NR_rt_sigreturn
diff --git a/arch/s390/kernel/vdso/vdso_wrapper.S b/arch/s390/kernel/vdso/vdso_wrapper.S
new file mode 100644
index 000000000000..f69e62a14978
--- /dev/null
+++ b/arch/s390/kernel/vdso/vdso_wrapper.S
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+ __PAGE_ALIGNED_DATA
+
+ .globl vdso_start, vdso_end
+ .balign PAGE_SIZE
+vdso_start:
+ .incbin "arch/s390/kernel/vdso/vdso.so"
+ .balign PAGE_SIZE
+vdso_end:
+
+ .previous
diff --git a/arch/s390/kernel/vdso/vgetrandom-chacha.S b/arch/s390/kernel/vdso/vgetrandom-chacha.S
new file mode 100644
index 000000000000..09c034c2f853
--- /dev/null
+++ b/arch/s390/kernel/vdso/vgetrandom-chacha.S
@@ -0,0 +1,181 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/stringify.h>
+#include <linux/linkage.h>
+#include <asm/alternative.h>
+#include <asm/dwarf.h>
+#include <asm/fpu-insn.h>
+
+#define STATE0 %v0
+#define STATE1 %v1
+#define STATE2 %v2
+#define STATE3 %v3
+#define COPY0 %v4
+#define COPY1 %v5
+#define COPY2 %v6
+#define COPY3 %v7
+#define BEPERM %v19
+#define TMP0 %v20
+#define TMP1 %v21
+#define TMP2 %v22
+#define TMP3 %v23
+
+ .section .rodata
+
+ .balign 32
+SYM_DATA_START_LOCAL(chacha20_constants)
+ .long 0x61707865,0x3320646e,0x79622d32,0x6b206574 # endian-neutral
+ .long 0x03020100,0x07060504,0x0b0a0908,0x0f0e0d0c # byte swap
+SYM_DATA_END(chacha20_constants)
+
+ .text
+/*
+ * s390 ChaCha20 implementation meant for vDSO. Produces a given positive
+ * number of blocks of output with nonce 0, taking an input key and 8-bytes
+ * counter. Does not spill to the stack.
+ *
+ * void __arch_chacha20_blocks_nostack(uint8_t *dst_bytes,
+ * const uint8_t *key,
+ * uint32_t *counter,
+ * size_t nblocks)
+ */
+SYM_FUNC_START(__arch_chacha20_blocks_nostack)
+ CFI_STARTPROC
+ larl %r1,chacha20_constants
+
+ /* COPY0 = "expand 32-byte k" */
+ VL COPY0,0,,%r1
+
+ /* BEPERM = byte selectors for VPERM */
+ ALTERNATIVE __stringify(VL BEPERM,16,,%r1), "brcl 0,0", ALT_FACILITY(148)
+
+ /* COPY1,COPY2 = key */
+ VLM COPY1,COPY2,0,%r3
+
+ /* COPY3 = counter || zero nonce */
+ lg %r3,0(%r4)
+ VZERO COPY3
+ VLVGG COPY3,%r3,0
+
+ lghi %r1,0
+.Lblock:
+ VLR STATE0,COPY0
+ VLR STATE1,COPY1
+ VLR STATE2,COPY2
+ VLR STATE3,COPY3
+
+ lghi %r0,10
+.Ldoubleround:
+ /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 16) */
+ VAF STATE0,STATE0,STATE1
+ VX STATE3,STATE3,STATE0
+ VERLLF STATE3,STATE3,16
+
+ /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 12) */
+ VAF STATE2,STATE2,STATE3
+ VX STATE1,STATE1,STATE2
+ VERLLF STATE1,STATE1,12
+
+ /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 8) */
+ VAF STATE0,STATE0,STATE1
+ VX STATE3,STATE3,STATE0
+ VERLLF STATE3,STATE3,8
+
+ /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 7) */
+ VAF STATE2,STATE2,STATE3
+ VX STATE1,STATE1,STATE2
+ VERLLF STATE1,STATE1,7
+
+ /* STATE1[0,1,2,3] = STATE1[1,2,3,0] */
+ VSLDB STATE1,STATE1,STATE1,4
+ /* STATE2[0,1,2,3] = STATE2[2,3,0,1] */
+ VSLDB STATE2,STATE2,STATE2,8
+ /* STATE3[0,1,2,3] = STATE3[3,0,1,2] */
+ VSLDB STATE3,STATE3,STATE3,12
+
+ /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 16) */
+ VAF STATE0,STATE0,STATE1
+ VX STATE3,STATE3,STATE0
+ VERLLF STATE3,STATE3,16
+
+ /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 12) */
+ VAF STATE2,STATE2,STATE3
+ VX STATE1,STATE1,STATE2
+ VERLLF STATE1,STATE1,12
+
+ /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 8) */
+ VAF STATE0,STATE0,STATE1
+ VX STATE3,STATE3,STATE0
+ VERLLF STATE3,STATE3,8
+
+ /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 7) */
+ VAF STATE2,STATE2,STATE3
+ VX STATE1,STATE1,STATE2
+ VERLLF STATE1,STATE1,7
+
+ /* STATE1[0,1,2,3] = STATE1[3,0,1,2] */
+ VSLDB STATE1,STATE1,STATE1,12
+ /* STATE2[0,1,2,3] = STATE2[2,3,0,1] */
+ VSLDB STATE2,STATE2,STATE2,8
+ /* STATE3[0,1,2,3] = STATE3[1,2,3,0] */
+ VSLDB STATE3,STATE3,STATE3,4
+ brctg %r0,.Ldoubleround
+
+ /* OUTPUT0 = STATE0 + COPY0 */
+ VAF STATE0,STATE0,COPY0
+ /* OUTPUT1 = STATE1 + COPY1 */
+ VAF STATE1,STATE1,COPY1
+ /* OUTPUT2 = STATE2 + COPY2 */
+ VAF STATE2,STATE2,COPY2
+ /* OUTPUT3 = STATE3 + COPY3 */
+ VAF STATE3,STATE3,COPY3
+
+ ALTERNATIVE \
+ __stringify( \
+ /* Convert STATE to little endian and store to OUTPUT */\
+ VPERM TMP0,STATE0,STATE0,BEPERM; \
+ VPERM TMP1,STATE1,STATE1,BEPERM; \
+ VPERM TMP2,STATE2,STATE2,BEPERM; \
+ VPERM TMP3,STATE3,STATE3,BEPERM; \
+ VSTM TMP0,TMP3,0,%r2), \
+ __stringify( \
+ /* 32 bit wise little endian store to OUTPUT */ \
+ VSTBRF STATE0,0,,%r2; \
+ VSTBRF STATE1,16,,%r2; \
+ VSTBRF STATE2,32,,%r2; \
+ VSTBRF STATE3,48,,%r2; \
+ brcl 0,0), \
+ ALT_FACILITY(148)
+
+ /* ++COPY3.COUNTER */
+ /* alsih %r3,1 */
+ .insn rilu,0xcc0a00000000,%r3,1
+ alcr %r3,%r1
+ VLVGG COPY3,%r3,0
+
+ /* OUTPUT += 64, --NBLOCKS */
+ aghi %r2,64
+ brctg %r5,.Lblock
+
+ /* COUNTER = COPY3.COUNTER */
+ stg %r3,0(%r4)
+
+ /* Zero out potentially sensitive regs */
+ VZERO STATE0
+ VZERO STATE1
+ VZERO STATE2
+ VZERO STATE3
+ VZERO COPY1
+ VZERO COPY2
+
+ /* Early exit if TMP0-TMP3 have not been used */
+ ALTERNATIVE "nopr", "br %r14", ALT_FACILITY(148)
+
+ VZERO TMP0
+ VZERO TMP1
+ VZERO TMP2
+ VZERO TMP3
+
+ br %r14
+ CFI_ENDPROC
+SYM_FUNC_END(__arch_chacha20_blocks_nostack)
diff --git a/arch/s390/kernel/vdso/vgetrandom.c b/arch/s390/kernel/vdso/vgetrandom.c
new file mode 100644
index 000000000000..b5268b507fb5
--- /dev/null
+++ b/arch/s390/kernel/vdso/vgetrandom.c
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <asm/facility.h>
+#include <uapi/asm-generic/errno.h>
+#include "vdso.h"
+
+ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
+{
+ if (test_facility(129))
+ return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);
+ if (unlikely(opaque_len == ~0UL && !buffer && !len && !flags))
+ return -ENOSYS;
+ return getrandom_syscall(buffer, len, flags);
+}
generated by cgit v1.2.3 (git 2.46.0) at 2025-12-03 13:59:06 +0000