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authorXi Ruoyao <xry111@xry111.site>2024-09-01 08:13:11 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2024-09-13 17:28:35 +0200
commit18efd0b10e0fd77fe649a375f9f17a387b5d1609 (patch)
tree66cb8366065d0f5866f08e4cade3e2ccd968eb99 /arch/loongarch/include/asm
parentrandom: vDSO: add a __vdso_getrandom prototype for all architectures (diff)
downloadlinux-18efd0b10e0fd77fe649a375f9f17a387b5d1609.tar.xz
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LoongArch: vDSO: Wire up getrandom() vDSO implementation
Hook up the generic vDSO implementation to the LoongArch vDSO data page by providing the required __arch_chacha20_blocks_nostack, __arch_get_k_vdso_rng_data, and getrandom_syscall implementations. Also wire up the selftests. Signed-off-by: Xi Ruoyao <xry111@xry111.site> Acked-by: Huacai Chen <chenhuacai@kernel.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'arch/loongarch/include/asm')
-rw-r--r--arch/loongarch/include/asm/vdso/getrandom.h39
-rw-r--r--arch/loongarch/include/asm/vdso/vdso.h6
-rw-r--r--arch/loongarch/include/asm/vdso/vsyscall.h8
3 files changed, 53 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/vdso/getrandom.h b/arch/loongarch/include/asm/vdso/getrandom.h
new file mode 100644
index 000000000000..02f36772541b
--- /dev/null
+++ b/arch/loongarch/include/asm/vdso/getrandom.h
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2024 Xi Ruoyao <xry111@xry111.site>. All Rights Reserved.
+ */
+#ifndef __ASM_VDSO_GETRANDOM_H
+#define __ASM_VDSO_GETRANDOM_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/unistd.h>
+#include <asm/vdso/vdso.h>
+
+static __always_inline ssize_t getrandom_syscall(void *_buffer, size_t _len, unsigned int _flags)
+{
+ register long ret asm("a0");
+ register long nr asm("a7") = __NR_getrandom;
+ register void *buffer asm("a0") = _buffer;
+ register size_t len asm("a1") = _len;
+ register unsigned int flags asm("a2") = _flags;
+
+ asm volatile(
+ " syscall 0\n"
+ : "+r" (ret)
+ : "r" (nr), "r" (buffer), "r" (len), "r" (flags)
+ : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8",
+ "memory");
+
+ return ret;
+}
+
+static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void)
+{
+ return (const struct vdso_rng_data *)(get_vdso_data() + VVAR_LOONGARCH_PAGES_START *
+ PAGE_SIZE + offsetof(struct loongarch_vdso_data, rng_data));
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_GETRANDOM_H */
diff --git a/arch/loongarch/include/asm/vdso/vdso.h b/arch/loongarch/include/asm/vdso/vdso.h
index 5a12309d9fb5..e31ac7474513 100644
--- a/arch/loongarch/include/asm/vdso/vdso.h
+++ b/arch/loongarch/include/asm/vdso/vdso.h
@@ -4,6 +4,9 @@
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
+#ifndef _ASM_VDSO_VDSO_H
+#define _ASM_VDSO_VDSO_H
+
#ifndef __ASSEMBLY__
#include <asm/asm.h>
@@ -16,6 +19,7 @@ struct vdso_pcpu_data {
struct loongarch_vdso_data {
struct vdso_pcpu_data pdata[NR_CPUS];
+ struct vdso_rng_data rng_data;
};
/*
@@ -63,3 +67,5 @@ static inline unsigned long get_vdso_data(void)
}
#endif /* __ASSEMBLY__ */
+
+#endif
diff --git a/arch/loongarch/include/asm/vdso/vsyscall.h b/arch/loongarch/include/asm/vdso/vsyscall.h
index 5de615383a22..b1273ce6f140 100644
--- a/arch/loongarch/include/asm/vdso/vsyscall.h
+++ b/arch/loongarch/include/asm/vdso/vsyscall.h
@@ -8,6 +8,7 @@
#include <vdso/datapage.h>
extern struct vdso_data *vdso_data;
+extern struct vdso_rng_data *vdso_rng_data;
/*
* Update the vDSO data page to keep in sync with kernel timekeeping.
@@ -19,6 +20,13 @@ struct vdso_data *__loongarch_get_k_vdso_data(void)
}
#define __arch_get_k_vdso_data __loongarch_get_k_vdso_data
+static __always_inline
+struct vdso_rng_data *__loongarch_get_k_vdso_rng_data(void)
+{
+ return vdso_rng_data;
+}
+#define __arch_get_k_vdso_rng_data __loongarch_get_k_vdso_rng_data
+
/* The asm-generic header needs to be included after the definitions above */
#include <asm-generic/vdso/vsyscall.h>