[PATCH net-next v4 06/20] zinc: ChaCha20 MIPS32r2 implementation

From: Jason A. Donenfeld
Date: Fri Sep 14 2018 - 12:23:45 EST

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This MIPS32r2 implementation comes from RenÃ van Dorst and me and
results in a nice speedup on the usual OpenWRT targets.

Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: RenÃ van Dorst <opensource@xxxxxxxxxx>
Cc: Samuel Neves <sneves@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jean-Philippe Aumasson <jeanphilippe.aumasson@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
---
lib/zinc/Makefile | 4 +
lib/zinc/chacha20/chacha20-mips-glue.h | 28 ++
lib/zinc/chacha20/chacha20-mips.S | 474 +++++++++++++++++++++++++
3 files changed, 506 insertions(+)
create mode 100644 lib/zinc/chacha20/chacha20-mips-glue.h
create mode 100644 lib/zinc/chacha20/chacha20-mips.S

diff --git a/lib/zinc/Makefile b/lib/zinc/Makefile
index 32e4bd94ea0b..9f6a5e65d729 100644
--- a/lib/zinc/Makefile
+++ b/lib/zinc/Makefile
@@ -17,6 +17,10 @@ ifeq ($(CONFIG_ZINC_ARCH_ARM64),y)
zinc-y += chacha20/chacha20-arm64.o
CFLAGS_chacha20.o += -include $(srctree)/$(src)/chacha20/chacha20-arm-glue.h
endif
+ifeq ($(CONFIG_ZINC_ARCH_MIPS)$(CONFIG_CPU_MIPS32_R2),yy)
+zinc-y += chacha20/chacha20-mips.o
+CFLAGS_chacha20.o += -include $(srctree)/$(src)/chacha20/chacha20-mips-glue.h
+endif
endif

zinc-y += main.o
diff --git a/lib/zinc/chacha20/chacha20-mips-glue.h b/lib/zinc/chacha20/chacha20-mips-glue.h
new file mode 100644
index 000000000000..5b2c8cec36c8
--- /dev/null
+++ b/lib/zinc/chacha20/chacha20-mips-glue.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@xxxxxxxxx>. All Rights Reserved.
+ */
+
+#include <zinc/chacha20.h>
+
+asmlinkage void chacha20_mips(u8 *out, const u8 *in, const size_t len,
+ const u32 key[8], const u32 counter[4]);
+void __init chacha20_fpu_init(void)
+{
+}
+
+static inline bool chacha20_arch(u8 *dst, const u8 *src, const size_t len,
+ const u32 key[8], const u32 counter[4],
+ simd_context_t simd_context)
+{
+ chacha20_mips(dst, src, len, key, counter);
+ return true;
+}
+
+static inline bool hchacha20_arch(u8 *derived_key, const u8 *nonce,
+ const u8 *key, simd_context_t simd_context)
+{
+ return false;
+}
+
+#define HAVE_CHACHA20_ARCH_IMPLEMENTATION
diff --git a/lib/zinc/chacha20/chacha20-mips.S b/lib/zinc/chacha20/chacha20-mips.S
new file mode 100644
index 000000000000..77da2c2fb240
--- /dev/null
+++ b/lib/zinc/chacha20/chacha20-mips.S
@@ -0,0 +1,474 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2016-2018 RenÃ van Dorst <opensource@xxxxxxxxxx>. All Rights Reserved.
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@xxxxxxxxx>. All Rights Reserved.
+ */
+
+#define MASK_U32 0x3c
+#define MASK_BYTES 0x03
+#define CHACHA20_BLOCK_SIZE 64
+#define STACK_SIZE 4*16
+
+#define X0 $t0
+#define X1 $t1
+#define X2 $t2
+#define X3 $t3
+#define X4 $t4
+#define X5 $t5
+#define X6 $t6
+#define X7 $t7
+#define X8 $v1
+#define X9 $fp
+#define X10 $s7
+#define X11 $s6
+#define X12 $s5
+#define X13 $s4
+#define X14 $s3
+#define X15 $s2
+/* Use regs which are overwritten on exit for Tx so we don't leak clear data. */
+#define T0 $s1
+#define T1 $s0
+#define T(n) T ## n
+#define X(n) X ## n
+
+/* Input arguments */
+#define OUT $a0
+#define IN $a1
+#define BYTES $a2
+/* KEY and NONCE argument must be u32 aligned */
+#define KEY $a3
+/* NONCE pointer is given via stack */
+#define NONCE $t9
+
+/* Output argument */
+/* NONCE[0] is kept in a register and not in memory.
+ * We don't want to touch original value in memory.
+ * Must be incremented every loop iteration.
+ */
+#define NONCE_0 $v0
+
+/* SAVED_X and SAVED_CA are set in the jump table.
+ * Use regs which are overwritten on exit else we don't leak clear data.
+ * They are used to handling the last bytes which are not multiple of 4.
+ */
+#define SAVED_X X15
+#define SAVED_CA $ra
+
+#define PTR_LAST_ROUND $t8
+
+/* ChaCha20 constants and stack location */
+#define CONSTANT_OFS_SP 48
+#define UNALIGNED_OFS_SP 40
+
+#define CONSTANT_1 0x61707865
+#define CONSTANT_2 0x3320646e
+#define CONSTANT_3 0x79622d32
+#define CONSTANT_4 0x6b206574
+
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define MSB 0
+#define LSB 3
+#define ROTx rotl
+#define ROTR(n) rotr n, 24
+#define CPU_TO_LE32(n) \
+ wsbh n; \
+ rotr n, 16;
+#else
+#define MSB 3
+#define LSB 0
+#define ROTx rotr
+#define CPU_TO_LE32(n)
+#define ROTR(n)
+#endif
+
+#define STORE_UNALIGNED(x, a, s, o) \
+.Lchacha20_mips_xor_unaligned_ ## x ## _b: ; \
+ .if ((s != NONCE) || (o != 0)); \
+ lw T0, o(s); \
+ .endif; \
+ lwl T1, x-4+MSB ## (IN); \
+ lwr T1, x-4+LSB ## (IN); \
+ .if ((s == NONCE) && (o == 0)); \
+ addu X ## a, NONCE_0; \
+ .else; \
+ addu X ## a, T0; \
+ .endif; \
+ CPU_TO_LE32(X ## a); \
+ xor X ## a, T1; \
+ swl X ## a, x-4+MSB ## (OUT); \
+ swr X ## a, x-4+LSB ## (OUT);
+
+#define STORE_ALIGNED(x, a, s, o) \
+.Lchacha20_mips_xor_aligned_ ## x ## _b: ; \
+ .if ((s != NONCE) || (o != 0)); \
+ lw T0, o(s); \
+ .endif; \
+ lw T1, x-4 ## (IN); \
+ .if ((s == NONCE) && (o == 0)); \
+ addu X ## a, NONCE_0; \
+ .else; \
+ addu X ## a, T0; \
+ .endif; \
+ CPU_TO_LE32(X ## a); \
+ xor X ## a, T1; \
+ sw X ## a, x-4 ## (OUT);
+
+/* Jump table macro.
+ * Used for setup and handling the last bytes, which are not multiple of 4.
+ * X15 is free to store Xn
+ * Every jumptable entry must be equal in size.
+ */
+#define JMPTBL_ALIGNED(x, a, s, o) \
+.Lchacha20_mips_jmptbl_aligned_ ## a: ; \
+ .if ((s == NONCE) && (o == 0)); \
+ move SAVED_CA, NONCE_0; \
+ .else; \
+ lw SAVED_CA, o(s);\
+ .endif; \
+ b .Lchacha20_mips_xor_aligned_ ## x ## _b; \
+ move SAVED_X, X ## a;
+
+#define JMPTBL_UNALIGNED(x, a, s, o) \
+.Lchacha20_mips_jmptbl_unaligned_ ## a: ; \
+ .if ((s == NONCE) && (o == 0)); \
+ move SAVED_CA, NONCE_0; \
+ .else; \
+ lw SAVED_CA, o(s);\
+ .endif; \
+ b .Lchacha20_mips_xor_unaligned_ ## x ## _b; \
+ move SAVED_X, X ## a;
+
+#define AXR(A, B, C, D, K, L, M, N, V, W, Y, Z, S) \
+ addu X(A), X(K); \
+ addu X(B), X(L); \
+ addu X(C), X(M); \
+ addu X(D), X(N); \
+ xor X(V), X(A); \
+ xor X(W), X(B); \
+ xor X(Y), X(C); \
+ xor X(Z), X(D); \
+ rotl X(V), S; \
+ rotl X(W), S; \
+ rotl X(Y), S; \
+ rotl X(Z), S;
+
+.text
+.set reorder
+.set noat
+.globl chacha20_mips
+.ent chacha20_mips
+chacha20_mips:
+ .frame $sp, STACK_SIZE, $ra
+ /* This is in the fifth argument */
+ lw NONCE, 16($sp)
+
+ /* Return bytes = 0. */
+ .set noreorder
+ beqz BYTES, .Lchacha20_mips_end
+ addiu $sp, -STACK_SIZE
+ .set reorder
+
+ /* Calculate PTR_LAST_ROUND */
+ addiu PTR_LAST_ROUND, BYTES, -1
+ ins PTR_LAST_ROUND, $zero, 0, 6
+ addu PTR_LAST_ROUND, OUT
+
+ /* Save s0-s7, fp, ra. */
+ sw $ra, 0($sp)
+ sw $fp, 4($sp)
+ sw $s0, 8($sp)
+ sw $s1, 12($sp)
+ sw $s2, 16($sp)
+ sw $s3, 20($sp)
+ sw $s4, 24($sp)
+ sw $s5, 28($sp)
+ sw $s6, 32($sp)
+ sw $s7, 36($sp)
+
+ lw NONCE_0, 0(NONCE)
+ /* Test IN or OUT is unaligned.
+ * UNALIGNED (T1) = ( IN | OUT ) & 0x00000003
+ */
+ or T1, IN, OUT
+ andi T1, 0x3
+
+ /* Load constant */
+ lui X0, %hi(CONSTANT_1)
+ lui X1, %hi(CONSTANT_2)
+ lui X2, %hi(CONSTANT_3)
+ lui X3, %hi(CONSTANT_4)
+ ori X0, %lo(CONSTANT_1)
+ ori X1, %lo(CONSTANT_2)
+ ori X2, %lo(CONSTANT_3)
+ ori X3, %lo(CONSTANT_4)
+
+ /* Store constant on stack. */
+ sw X0, 0+CONSTANT_OFS_SP($sp)
+ sw X1, 4+CONSTANT_OFS_SP($sp)
+ sw X2, 8+CONSTANT_OFS_SP($sp)
+ sw X3, 12+CONSTANT_OFS_SP($sp)
+
+ sw T1, UNALIGNED_OFS_SP($sp)
+
+ .set noreorder
+ b .Lchacha20_rounds_start
+ andi BYTES, (CHACHA20_BLOCK_SIZE-1)
+ .set reorder
+
+.align 4
+.Loop_chacha20_rounds:
+ addiu IN, CHACHA20_BLOCK_SIZE
+ addiu OUT, CHACHA20_BLOCK_SIZE
+ addiu NONCE_0, 1
+
+ lw X0, 0+CONSTANT_OFS_SP($sp)
+ lw X1, 4+CONSTANT_OFS_SP($sp)
+ lw X2, 8+CONSTANT_OFS_SP($sp)
+ lw X3, 12+CONSTANT_OFS_SP($sp)
+ lw T1, UNALIGNED_OFS_SP($sp)
+
+.Lchacha20_rounds_start:
+ lw X4, 0(KEY)
+ lw X5, 4(KEY)
+ lw X6, 8(KEY)
+ lw X7, 12(KEY)
+ lw X8, 16(KEY)
+ lw X9, 20(KEY)
+ lw X10, 24(KEY)
+ lw X11, 28(KEY)
+
+ move X12, NONCE_0
+ lw X13, 4(NONCE)
+ lw X14, 8(NONCE)
+ lw X15, 12(NONCE)
+
+ li $at, 9
+.Loop_chacha20_xor_rounds:
+ AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 16);
+ AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 12);
+ AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 8);
+ AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 7);
+ AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 16);
+ AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 12);
+ AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 8);
+ AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 7);
+ .set noreorder
+ bnez $at, .Loop_chacha20_xor_rounds
+ addiu $at, -1
+
+ /* Unaligned? Jump */
+ bnez T1, .Loop_chacha20_unaligned
+ andi $at, BYTES, MASK_U32
+
+ /* Last round? No jump */
+ bne OUT, PTR_LAST_ROUND, .Lchacha20_mips_xor_aligned_64_b
+ /* Load upper half of jump table addr */
+ lui T0, %hi(.Lchacha20_mips_jmptbl_aligned_0)
+
+ /* Full block? Jump */
+ beqz BYTES, .Lchacha20_mips_xor_aligned_64_b
+ /* Calculate lower half jump table addr and offset */
+ ins T0, $at, 2, 6
+
+ subu T0, $at
+ addiu T0, %lo(.Lchacha20_mips_jmptbl_aligned_0)
+
+ jr T0
+ /* Delay slot */
+ nop
+
+ .set reorder
+
+.Loop_chacha20_unaligned:
+ .set noreorder
+
+ /* Last round? no jump */
+ bne OUT, PTR_LAST_ROUND, .Lchacha20_mips_xor_unaligned_64_b
+ /* Load upper half of jump table addr */
+ lui T0, %hi(.Lchacha20_mips_jmptbl_unaligned_0)
+
+ /* Full block? Jump */
+ beqz BYTES, .Lchacha20_mips_xor_unaligned_64_b
+
+ /* Calculate lower half jump table addr and offset */
+ ins T0, $at, 2, 6
+ subu T0, $at
+ addiu T0, %lo(.Lchacha20_mips_jmptbl_unaligned_0)
+
+ jr T0
+ /* Delay slot */
+ nop
+
+ .set reorder
+
+/* Aligned code path
+ */
+.align 4
+ STORE_ALIGNED(64, 15, NONCE,12)
+ STORE_ALIGNED(60, 14, NONCE, 8)
+ STORE_ALIGNED(56, 13, NONCE, 4)
+ STORE_ALIGNED(52, 12, NONCE, 0)
+ STORE_ALIGNED(48, 11, KEY, 28)
+ STORE_ALIGNED(44, 10, KEY, 24)
+ STORE_ALIGNED(40, 9, KEY, 20)
+ STORE_ALIGNED(36, 8, KEY, 16)
+ STORE_ALIGNED(32, 7, KEY, 12)
+ STORE_ALIGNED(28, 6, KEY, 8)
+ STORE_ALIGNED(24, 5, KEY, 4)
+ STORE_ALIGNED(20, 4, KEY, 0)
+ STORE_ALIGNED(16, 3, $sp, 12+CONSTANT_OFS_SP)
+ STORE_ALIGNED(12, 2, $sp, 8+CONSTANT_OFS_SP)
+ STORE_ALIGNED( 8, 1, $sp, 4+CONSTANT_OFS_SP)
+.Lchacha20_mips_xor_aligned_4_b:
+ /* STORE_ALIGNED( 4, 0, $sp, 0+CONSTANT_OFS_SP) */
+ lw T0, 0+CONSTANT_OFS_SP($sp)
+ lw T1, 0(IN)
+ addu X0, T0
+ CPU_TO_LE32(X0)
+ xor X0, T1
+ .set noreorder
+ bne OUT, PTR_LAST_ROUND, .Loop_chacha20_rounds
+ sw X0, 0(OUT)
+ .set reorder
+
+ .set noreorder
+ bne $at, BYTES, .Lchacha20_mips_xor_bytes
+ /* Empty delayslot, Increase NONCE_0, return NONCE_0 value */
+ addiu NONCE_0, 1
+ .set noreorder
+
+.Lchacha20_mips_xor_done:
+ /* Restore used registers */
+ lw $ra, 0($sp)
+ lw $fp, 4($sp)
+ lw $s0, 8($sp)
+ lw $s1, 12($sp)
+ lw $s2, 16($sp)
+ lw $s3, 20($sp)
+ lw $s4, 24($sp)
+ lw $s5, 28($sp)
+ lw $s6, 32($sp)
+ lw $s7, 36($sp)
+.Lchacha20_mips_end:
+ .set noreorder
+ jr $ra
+ addiu $sp, STACK_SIZE
+ .set reorder
+
+ .set noreorder
+ /* Start jump table */
+ JMPTBL_ALIGNED( 0, 0, $sp, 0+CONSTANT_OFS_SP)
+ JMPTBL_ALIGNED( 4, 1, $sp, 4+CONSTANT_OFS_SP)
+ JMPTBL_ALIGNED( 8, 2, $sp, 8+CONSTANT_OFS_SP)
+ JMPTBL_ALIGNED(12, 3, $sp, 12+CONSTANT_OFS_SP)
+ JMPTBL_ALIGNED(16, 4, KEY, 0)
+ JMPTBL_ALIGNED(20, 5, KEY, 4)
+ JMPTBL_ALIGNED(24, 6, KEY, 8)
+ JMPTBL_ALIGNED(28, 7, KEY, 12)
+ JMPTBL_ALIGNED(32, 8, KEY, 16)
+ JMPTBL_ALIGNED(36, 9, KEY, 20)
+ JMPTBL_ALIGNED(40, 10, KEY, 24)
+ JMPTBL_ALIGNED(44, 11, KEY, 28)
+ JMPTBL_ALIGNED(48, 12, NONCE, 0)
+ JMPTBL_ALIGNED(52, 13, NONCE, 4)
+ JMPTBL_ALIGNED(56, 14, NONCE, 8)
+ JMPTBL_ALIGNED(60, 15, NONCE,12)
+ /* End jump table */
+ .set reorder
+
+/* Unaligned code path
+ */
+ STORE_UNALIGNED(64, 15, NONCE,12)
+ STORE_UNALIGNED(60, 14, NONCE, 8)
+ STORE_UNALIGNED(56, 13, NONCE, 4)
+ STORE_UNALIGNED(52, 12, NONCE, 0)
+ STORE_UNALIGNED(48, 11, KEY, 28)
+ STORE_UNALIGNED(44, 10, KEY, 24)
+ STORE_UNALIGNED(40, 9, KEY, 20)
+ STORE_UNALIGNED(36, 8, KEY, 16)
+ STORE_UNALIGNED(32, 7, KEY, 12)
+ STORE_UNALIGNED(28, 6, KEY, 8)
+ STORE_UNALIGNED(24, 5, KEY, 4)
+ STORE_UNALIGNED(20, 4, KEY, 0)
+ STORE_UNALIGNED(16, 3, $sp, 12+CONSTANT_OFS_SP)
+ STORE_UNALIGNED(12, 2, $sp, 8+CONSTANT_OFS_SP)
+ STORE_UNALIGNED( 8, 1, $sp, 4+CONSTANT_OFS_SP)
+.Lchacha20_mips_xor_unaligned_4_b:
+ /* STORE_UNALIGNED( 4, 0, $sp, 0+CONSTANT_OFS_SP) */
+ lw T0, 0+CONSTANT_OFS_SP($sp)
+ lwl T1, 0+MSB(IN)
+ lwr T1, 0+LSB(IN)
+ addu X0, T0
+ CPU_TO_LE32(X0)
+ xor X0, T1
+ swl X0, 0+MSB(OUT)
+ .set noreorder
+ bne OUT, PTR_LAST_ROUND, .Loop_chacha20_rounds
+ swr X0, 0+LSB(OUT)
+ .set reorder
+
+ /* Fall through to byte handling */
+ .set noreorder
+ beq $at, BYTES, .Lchacha20_mips_xor_done
+ /* Empty delayslot, increase NONCE_0, return NONCE_0 value */
+.Lchacha20_mips_xor_unaligned_0_b:
+.Lchacha20_mips_xor_aligned_0_b:
+ addiu NONCE_0, 1
+ .set reorder
+
+.Lchacha20_mips_xor_bytes:
+ addu OUT, $at
+ addu IN, $at
+ addu SAVED_X, SAVED_CA
+ /* First byte */
+ lbu T1, 0(IN)
+ andi $at, BYTES, 2
+ CPU_TO_LE32(SAVED_X)
+ ROTR(SAVED_X)
+ xor T1, SAVED_X
+ .set noreorder
+ beqz $at, .Lchacha20_mips_xor_done
+ sb T1, 0(OUT)
+ .set reorder
+ /* Second byte */
+ lbu T1, 1(IN)
+ andi $at, BYTES, 1
+ ROTx SAVED_X, 8
+ xor T1, SAVED_X
+ .set noreorder
+ beqz $at, .Lchacha20_mips_xor_done
+ sb T1, 1(OUT)
+ .set reorder
+ /* Third byte */
+ lbu T1, 2(IN)
+ ROTx SAVED_X, 8
+ xor T1, SAVED_X
+ .set noreorder
+ b .Lchacha20_mips_xor_done
+ sb T1, 2(OUT)
+ .set reorder
+.set noreorder
+
+.Lchacha20_mips_jmptbl_unaligned:
+ /* Start jump table */
+ JMPTBL_UNALIGNED( 0, 0, $sp, 0+CONSTANT_OFS_SP)
+ JMPTBL_UNALIGNED( 4, 1, $sp, 4+CONSTANT_OFS_SP)
+ JMPTBL_UNALIGNED( 8, 2, $sp, 8+CONSTANT_OFS_SP)
+ JMPTBL_UNALIGNED(12, 3, $sp, 12+CONSTANT_OFS_SP)
+ JMPTBL_UNALIGNED(16, 4, KEY, 0)
+ JMPTBL_UNALIGNED(20, 5, KEY, 4)
+ JMPTBL_UNALIGNED(24, 6, KEY, 8)
+ JMPTBL_UNALIGNED(28, 7, KEY, 12)
+ JMPTBL_UNALIGNED(32, 8, KEY, 16)
+ JMPTBL_UNALIGNED(36, 9, KEY, 20)
+ JMPTBL_UNALIGNED(40, 10, KEY, 24)
+ JMPTBL_UNALIGNED(44, 11, KEY, 28)
+ JMPTBL_UNALIGNED(48, 12, NONCE, 0)
+ JMPTBL_UNALIGNED(52, 13, NONCE, 4)
+ JMPTBL_UNALIGNED(56, 14, NONCE, 8)
+ JMPTBL_UNALIGNED(60, 15, NONCE,12)
+ /* End jump table */
+.set reorder
+
+.end chacha20_mips
+.set at
--
2.19.0

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