@@ -37,6 +37,14 @@ ifeq ($(CONFIG_ZINC_ARCH_ARM64),y)
zinc-y += poly1305/poly1305-arm64.o
CFLAGS_poly1305.o += -include $(srctree)/$(src)/poly1305/poly1305-arm-glue.h
endif
+ifeq ($(CONFIG_ZINC_ARCH_MIPS)$(CONFIG_CPU_MIPS32_R2),yy)
+zinc-y += poly1305/poly1305-mips.o
+CFLAGS_poly1305.o += -include $(srctree)/$(src)/poly1305/poly1305-mips-glue.h
+endif
+ifeq ($(CONFIG_ZINC_ARCH_MIPS64),y)
+zinc-y += poly1305/poly1305-mips64.o
+CFLAGS_poly1305.o += -include $(srctree)/$(src)/poly1305/poly1305-mips-glue.h
+endif
endif
zinc-y += main.o
new file mode 100644
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <zinc/poly1305.h>
+
+asmlinkage void poly1305_init_mips(void *ctx, const u8 key[16]);
+asmlinkage void poly1305_blocks_mips(void *ctx, const u8 *inp, const size_t len,
+ const u32 padbit);
+asmlinkage void poly1305_emit_mips(void *ctx, u8 mac[16], const u32 nonce[4]);
+void __init poly1305_fpu_init(void)
+{
+}
+
+static inline bool poly1305_init_arch(void *ctx,
+ const u8 key[POLY1305_KEY_SIZE],
+ simd_context_t simd_context)
+{
+ poly1305_init_mips(ctx, key);
+ return true;
+}
+
+static inline bool poly1305_blocks_arch(void *ctx, const u8 *inp,
+ const size_t len, const u32 padbit,
+ simd_context_t simd_context)
+{
+ poly1305_blocks_mips(ctx, inp, len, padbit);
+ return true;
+}
+
+static inline bool poly1305_emit_arch(void *ctx, u8 mac[POLY1305_MAC_SIZE],
+ const u32 nonce[4],
+ simd_context_t simd_context)
+{
+ poly1305_emit_mips(ctx, mac, nonce);
+ return true;
+}
+
+#define HAVE_POLY1305_ARCH_IMPLEMENTATION
new file mode 100644
@@ -0,0 +1,417 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2016-2018 René van Dorst <opensource@vdorst.com> All Rights Reserved.
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define MSB 0
+#define LSB 3
+#else
+#define MSB 3
+#define LSB 0
+#endif
+
+#define POLY1305_BLOCK_SIZE 16
+.text
+#define H0 $t0
+#define H1 $t1
+#define H2 $t2
+#define H3 $t3
+#define H4 $t4
+
+#define R0 $t5
+#define R1 $t6
+#define R2 $t7
+#define R3 $t8
+
+#define O0 $s0
+#define O1 $s4
+#define O2 $v1
+#define O3 $t9
+#define O4 $s5
+
+#define S1 $s1
+#define S2 $s2
+#define S3 $s3
+
+#define SC $at
+#define CA $v0
+
+/* Input arguments */
+#define poly $a0
+#define src $a1
+#define srclen $a2
+#define hibit $a3
+
+/* Location in the opaque buffer
+ * R[0..3], CA, H[0..4]
+ */
+#define PTR_POLY1305_R(n) ( 0 + (n*4)) ## ($a0)
+#define PTR_POLY1305_CA (16 ) ## ($a0)
+#define PTR_POLY1305_H(n) (20 + (n*4)) ## ($a0)
+
+#define POLY1305_BLOCK_SIZE 16
+#define POLY1305_STACK_SIZE 8 * 4
+
+.set reorder
+.set noat
+.align 4
+.globl poly1305_blocks_mips
+.ent poly1305_blocks_mips
+poly1305_blocks_mips:
+ .frame $sp,POLY1305_STACK_SIZE,$31
+ /* srclen &= 0xFFFFFFF0 */
+ ins srclen, $zero, 0, 4
+
+ .set noreorder
+ /* check srclen >= 16 bytes */
+ beqz srclen, .Lpoly1305_blocks_mips_end
+ addiu $sp, -(POLY1305_STACK_SIZE)
+ .set reorder
+
+ /* Calculate last round based on src address pointer.
+ * last round src ptr (srclen) = src + (srclen & 0xFFFFFFF0)
+ */
+ addu srclen, src
+
+ lw R0, PTR_POLY1305_R(0)
+ lw R1, PTR_POLY1305_R(1)
+ lw R2, PTR_POLY1305_R(2)
+ lw R3, PTR_POLY1305_R(3)
+
+ /* store the used save registers. */
+ sw $s0, 0($sp)
+ sw $s1, 4($sp)
+ sw $s2, 8($sp)
+ sw $s3, 12($sp)
+ sw $s4, 16($sp)
+ sw $s5, 20($sp)
+
+ /* load Hx and Carry */
+ lw CA, PTR_POLY1305_CA
+ lw H0, PTR_POLY1305_H(0)
+ lw H1, PTR_POLY1305_H(1)
+ lw H2, PTR_POLY1305_H(2)
+ lw H3, PTR_POLY1305_H(3)
+ lw H4, PTR_POLY1305_H(4)
+
+ /* Sx = Rx + (Rx >> 2) */
+ srl S1, R1, 2
+ srl S2, R2, 2
+ srl S3, R3, 2
+ addu S1, R1
+ addu S2, R2
+ addu S3, R3
+
+ addiu SC, $zero, 1
+
+.Lpoly1305_loop:
+ lwl O0, 0+MSB(src)
+ lwl O1, 4+MSB(src)
+ lwl O2, 8+MSB(src)
+ lwl O3,12+MSB(src)
+ lwr O0, 0+LSB(src)
+ lwr O1, 4+LSB(src)
+ lwr O2, 8+LSB(src)
+ lwr O3,12+LSB(src)
+
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ wsbh O0
+ wsbh O1
+ wsbh O2
+ wsbh O3
+ rotr O0, 16
+ rotr O1, 16
+ rotr O2, 16
+ rotr O3, 16
+#endif
+
+ /* h0 = (u32)(d0 = (u64)h0 + inp[0] + c 'Carry_previous cycle'); */
+ addu H0, CA
+ sltu CA, H0, CA
+ addu O0, H0
+ sltu H0, O0, H0
+ addu CA, H0
+
+ /* h1 = (u32)(d1 = (u64)h1 + (d0 >> 32) + inp[4]); */
+ addu H1, CA
+ sltu CA, H1, CA
+ addu O1, H1
+ sltu H1, O1, H1
+ addu CA, H1
+
+ /* h2 = (u32)(d2 = (u64)h2 + (d1 >> 32) + inp[8]); */
+ addu H2, CA
+ sltu CA, H2, CA
+ addu O2, H2
+ sltu H2, O2, H2
+ addu CA, H2
+
+ /* h3 = (u32)(d3 = (u64)h3 + (d2 >> 32) + inp[12]); */
+ addu H3, CA
+ sltu CA, H3, CA
+ addu O3, H3
+ sltu H3, O3, H3
+ addu CA, H3
+
+ /* h4 += (u32)(d3 >> 32) + padbit; */
+ addu H4, hibit
+ addu O4, H4, CA
+
+ /* D0 */
+ multu O0, R0
+ maddu O1, S3
+ maddu O2, S2
+ maddu O3, S1
+ mfhi CA
+ mflo H0
+
+ /* D1 */
+ multu O0, R1
+ maddu O1, R0
+ maddu O2, S3
+ maddu O3, S2
+ maddu O4, S1
+ maddu CA, SC
+ mfhi CA
+ mflo H1
+
+ /* D2 */
+ multu O0, R2
+ maddu O1, R1
+ maddu O2, R0
+ maddu O3, S3
+ maddu O4, S2
+ maddu CA, SC
+ mfhi CA
+ mflo H2
+
+ /* D4 */
+ mul H4, O4, R0
+
+ /* D3 */
+ multu O0, R3
+ maddu O1, R2
+ maddu O2, R1
+ maddu O3, R0
+ maddu O4, S3
+ maddu CA, SC
+ mfhi CA
+ mflo H3
+
+ addiu src, POLY1305_BLOCK_SIZE
+
+ /* h4 += (u32)(d3 >> 32); */
+ addu O4, H4, CA
+ /* h4 &= 3 */
+ andi H4, O4, 3
+ /* c = (h4 >> 2) + (h4 & ~3U); */
+ srl CA, O4, 2
+ ins O4, $zero, 0, 2
+
+ /* able to do a 16 byte block. */
+ .set noreorder
+ bne src, srclen, .Lpoly1305_loop
+ /* Delay slot is always executed. */
+ addu CA, O4
+ .set reorder
+
+ /* restore the used save registers. */
+ lw $s0, 0($sp)
+ lw $s1, 4($sp)
+ lw $s2, 8($sp)
+ lw $s3, 12($sp)
+ lw $s4, 16($sp)
+ lw $s5, 20($sp)
+
+ /* store Hx and Carry */
+ sw CA, PTR_POLY1305_CA
+ sw H0, PTR_POLY1305_H(0)
+ sw H1, PTR_POLY1305_H(1)
+ sw H2, PTR_POLY1305_H(2)
+ sw H3, PTR_POLY1305_H(3)
+ sw H4, PTR_POLY1305_H(4)
+
+.Lpoly1305_blocks_mips_end:
+ /* Jump Back */
+ .set noreorder
+ jr $ra
+ addiu $sp, POLY1305_STACK_SIZE
+ .set reorder
+.end poly1305_blocks_mips
+.set at
+.set reorder
+
+/* Input arguments CTX=$a0, MAC=$a1, NONCE=$a2 */
+#define MAC $a1
+#define NONCE $a2
+
+#define G0 $t5
+#define G1 $t6
+#define G2 $t7
+#define G3 $t8
+#define G4 $t9
+
+.set reorder
+.set noat
+.align 4
+.globl poly1305_emit_mips
+.ent poly1305_emit_mips
+poly1305_emit_mips:
+ /* load Hx and Carry */
+ lw CA, PTR_POLY1305_CA
+ lw H0, PTR_POLY1305_H(0)
+ lw H1, PTR_POLY1305_H(1)
+ lw H2, PTR_POLY1305_H(2)
+ lw H3, PTR_POLY1305_H(3)
+ lw H4, PTR_POLY1305_H(4)
+
+ /* Add left over carry */
+ addu H0, CA
+ sltu CA, H0, CA
+ addu H1, CA
+ sltu CA, H1, CA
+ addu H2, CA
+ sltu CA, H2, CA
+ addu H3, CA
+ sltu CA, H3, CA
+ addu H4, CA
+
+ /* compare to modulus by computing h + -p */
+ addiu G0, H0, 5
+ sltu CA, G0, H0
+ addu G1, H1, CA
+ sltu CA, G1, H1
+ addu G2, H2, CA
+ sltu CA, G2, H2
+ addu G3, H3, CA
+ sltu CA, G3, H3
+ addu G4, H4, CA
+
+ srl SC, G4, 2
+
+ /* if there was carry into 131st bit, h3:h0 = g3:g0 */
+ movn H0, G0, SC
+ movn H1, G1, SC
+ movn H2, G2, SC
+ movn H3, G3, SC
+
+ lwl G0, 0+MSB(NONCE)
+ lwl G1, 4+MSB(NONCE)
+ lwl G2, 8+MSB(NONCE)
+ lwl G3,12+MSB(NONCE)
+ lwr G0, 0+LSB(NONCE)
+ lwr G1, 4+LSB(NONCE)
+ lwr G2, 8+LSB(NONCE)
+ lwr G3,12+LSB(NONCE)
+
+ /* mac = (h + nonce) % (2^128) */
+ addu H0, G0
+ sltu CA, H0, G0
+
+ /* H1 */
+ addu H1, CA
+ sltu CA, H1, CA
+ addu H1, G1
+ sltu G1, H1, G1
+ addu CA, G1
+
+ /* H2 */
+ addu H2, CA
+ sltu CA, H2, CA
+ addu H2, G2
+ sltu G2, H2, G2
+ addu CA, G2
+
+ /* H3 */
+ addu H3, CA
+ addu H3, G3
+
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ wsbh H0
+ wsbh H1
+ wsbh H2
+ wsbh H3
+ rotr H0, 16
+ rotr H1, 16
+ rotr H2, 16
+ rotr H3, 16
+#endif
+
+ /* store MAC */
+ swl H0, 0+MSB(MAC)
+ swl H1, 4+MSB(MAC)
+ swl H2, 8+MSB(MAC)
+ swl H3,12+MSB(MAC)
+ swr H0, 0+LSB(MAC)
+ swr H1, 4+LSB(MAC)
+ swr H2, 8+LSB(MAC)
+ .set noreorder
+ jr $ra
+ swr H3,12+LSB(MAC)
+ .set reorder
+.end poly1305_emit_mips
+
+#define PR0 $t0
+#define PR1 $t1
+#define PR2 $t2
+#define PR3 $t3
+#define PT0 $t4
+
+/* Input arguments CTX=$a0, KEY=$a1 */
+
+.align 4
+.globl poly1305_init_mips
+.ent poly1305_init_mips
+poly1305_init_mips:
+ lwl PR0, 0+MSB($a1)
+ lwl PR1, 4+MSB($a1)
+ lwl PR2, 8+MSB($a1)
+ lwl PR3,12+MSB($a1)
+ lwr PR0, 0+LSB($a1)
+ lwr PR1, 4+LSB($a1)
+ lwr PR2, 8+LSB($a1)
+ lwr PR3,12+LSB($a1)
+
+ /* store Hx and Carry */
+ sw $zero, PTR_POLY1305_CA
+ sw $zero, PTR_POLY1305_H(0)
+ sw $zero, PTR_POLY1305_H(1)
+ sw $zero, PTR_POLY1305_H(2)
+ sw $zero, PTR_POLY1305_H(3)
+ sw $zero, PTR_POLY1305_H(4)
+
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ wsbh PR0
+ wsbh PR1
+ wsbh PR2
+ wsbh PR3
+ rotr PR0, 16
+ rotr PR1, 16
+ rotr PR2, 16
+ rotr PR3, 16
+#endif
+
+ lui PT0, 0x0FFF
+ ori PT0, 0xFFFC
+
+ /* AND 0x0fffffff; */
+ ext PR0, PR0, 0, (32-4)
+
+ /* AND 0x0ffffffc; */
+ and PR1, PT0
+ and PR2, PT0
+ and PR3, PT0
+
+ /* store Rx */
+ sw PR0, PTR_POLY1305_R(0)
+ sw PR1, PTR_POLY1305_R(1)
+ sw PR2, PTR_POLY1305_R(2)
+
+ .set noreorder
+ /* Jump Back */
+ jr $ra
+ sw PR3, PTR_POLY1305_R(3)
+ .set reorder
+.end poly1305_init_mips
new file mode 100644
@@ -0,0 +1,359 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * Copyright (C) 2006-2017 CRYPTOGAMS by <appro@openssl.org>. All Rights Reserved.
+ *
+ * This is based in part on Andy Polyakov's implementation from CRYPTOGAMS.
+ */
+
+#if !defined(CONFIG_64BIT)
+#error "This is only for 64-bit kernels."
+#endif
+
+#ifdef __MIPSEB__
+#define MSB 0
+#define LSB 7
+#else
+#define MSB 7
+#define LSB 0
+#endif
+
+#if defined(CONFIG_CPU_MIPS64_R6) || defined(CONFIG_CPU_MIPSR6)
+#define dmultu(rs,rt)
+#define mflo(rd,rs,rt) dmulu rd,rs,rt
+#define mfhi(rd,rs,rt) dmuhu rd,rs,rt
+#else
+#define dmultu(rs,rt) dmultu rs,rt
+#define multu(rs,rt) multu rs,rt
+#define mflo(rd,rs,rt) mflo rd
+#define mfhi(rd,rs,rt) mfhi rd
+#endif
+
+.text
+.set noat
+.set noreorder
+
+/* While most of the assembly in the kernel prefers ENTRY() and ENDPROC(),
+ * there is no existing MIPS assembly that uses it, and MIPS assembler seems
+ * to like its own .ent/.end notation, which the MIPS include files don't
+ * provide in a MIPS-specific ENTRY/ENDPROC definition. So, we skip these
+ * for now, until somebody complains. */
+
+.align 5
+.globl poly1305_init_mips
+.ent poly1305_init_mips
+poly1305_init_mips:
+ .frame $29,0,$31
+ .set reorder
+
+ sd $0,0($4)
+ sd $0,8($4)
+ sd $0,16($4)
+
+ beqz $5,.Lno_key
+
+#if defined(CONFIG_CPU_MIPS64_R6) || defined(CONFIG_CPU_MIPSR6)
+ ld $8,0($5)
+ ld $9,8($5)
+#else
+ ldl $8,0+MSB($5)
+ ldl $9,8+MSB($5)
+ ldr $8,0+LSB($5)
+ ldr $9,8+LSB($5)
+#endif
+#ifdef __MIPSEB__
+#if defined(CONFIG_CPU_MIPS64_R2) || defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPS64_R6) || defined(CONFIG_CPU_MIPSR6)
+ dsbh $8,$8 # byte swap
+ dsbh $9,$9
+ dshd $8,$8
+ dshd $9,$9
+#else
+ ori $10,$0,0xFF
+ dsll $1,$10,32
+ or $10,$1 # 0x000000FF000000FF
+
+ and $11,$8,$10 # byte swap
+ and $2,$9,$10
+ dsrl $1,$8,24
+ dsrl $24,$9,24
+ dsll $11,24
+ dsll $2,24
+ and $1,$10
+ and $24,$10
+ dsll $10,8 # 0x0000FF000000FF00
+ or $11,$1
+ or $2,$24
+ and $1,$8,$10
+ and $24,$9,$10
+ dsrl $8,8
+ dsrl $9,8
+ dsll $1,8
+ dsll $24,8
+ and $8,$10
+ and $9,$10
+ or $11,$1
+ or $2,$24
+ or $8,$11
+ or $9,$2
+ dsrl $11,$8,32
+ dsrl $2,$9,32
+ dsll $8,32
+ dsll $9,32
+ or $8,$11
+ or $9,$2
+#endif
+#endif
+ li $10,1
+ dsll $10,32
+ daddiu $10,-63
+ dsll $10,28
+ daddiu $10,-1 # 0ffffffc0fffffff
+
+ and $8,$10
+ daddiu $10,-3 # 0ffffffc0ffffffc
+ and $9,$10
+
+ sd $8,24($4)
+ dsrl $10,$9,2
+ sd $9,32($4)
+ daddu $10,$9 # s1 = r1 + (r1 >> 2)
+ sd $10,40($4)
+
+.Lno_key:
+ li $2,0 # return 0
+ jr $31
+.end poly1305_init_mips
+
+.align 5
+.globl poly1305_blocks_mips
+.ent poly1305_blocks_mips
+poly1305_blocks_mips:
+ .set noreorder
+ dsrl $6,4 # number of complete blocks
+ bnez $6,poly1305_blocks_internal
+ nop
+ jr $31
+ nop
+.end poly1305_blocks_mips
+
+.align 5
+.ent poly1305_blocks_internal
+poly1305_blocks_internal:
+ .frame $29,6*8,$31
+ .mask 0x00030000,-8
+ .set noreorder
+ dsubu $29,6*8
+ sd $17,40($29)
+ sd $16,32($29)
+ .set reorder
+
+ ld $12,0($4) # load hash value
+ ld $13,8($4)
+ ld $14,16($4)
+
+ ld $15,24($4) # load key
+ ld $16,32($4)
+ ld $17,40($4)
+
+.Loop:
+#if defined(CONFIG_CPU_MIPS64_R6) || defined(CONFIG_CPU_MIPSR6)
+ ld $8,0($5) # load input
+ ld $9,8($5)
+#else
+ ldl $8,0+MSB($5) # load input
+ ldl $9,8+MSB($5)
+ ldr $8,0+LSB($5)
+ ldr $9,8+LSB($5)
+#endif
+ daddiu $6,-1
+ daddiu $5,16
+#ifdef __MIPSEB__
+#if defined(CONFIG_CPU_MIPS64_R2) || defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPS64_R6) || defined(CONFIG_CPU_MIPSR6)
+ dsbh $8,$8 # byte swap
+ dsbh $9,$9
+ dshd $8,$8
+ dshd $9,$9
+#else
+ ori $10,$0,0xFF
+ dsll $1,$10,32
+ or $10,$1 # 0x000000FF000000FF
+
+ and $11,$8,$10 # byte swap
+ and $2,$9,$10
+ dsrl $1,$8,24
+ dsrl $24,$9,24
+ dsll $11,24
+ dsll $2,24
+ and $1,$10
+ and $24,$10
+ dsll $10,8 # 0x0000FF000000FF00
+ or $11,$1
+ or $2,$24
+ and $1,$8,$10
+ and $24,$9,$10
+ dsrl $8,8
+ dsrl $9,8
+ dsll $1,8
+ dsll $24,8
+ and $8,$10
+ and $9,$10
+ or $11,$1
+ or $2,$24
+ or $8,$11
+ or $9,$2
+ dsrl $11,$8,32
+ dsrl $2,$9,32
+ dsll $8,32
+ dsll $9,32
+ or $8,$11
+ or $9,$2
+#endif
+#endif
+ daddu $12,$8 # accumulate input
+ daddu $13,$9
+ sltu $10,$12,$8
+ sltu $11,$13,$9
+ daddu $13,$10
+
+ dmultu ($15,$12) # h0*r0
+ daddu $14,$7
+ sltu $10,$13,$10
+ mflo ($8,$15,$12)
+ mfhi ($9,$15,$12)
+
+ dmultu ($17,$13) # h1*5*r1
+ daddu $10,$11
+ daddu $14,$10
+ mflo ($10,$17,$13)
+ mfhi ($11,$17,$13)
+
+ dmultu ($16,$12) # h0*r1
+ daddu $8,$10
+ daddu $9,$11
+ mflo ($1,$16,$12)
+ mfhi ($25,$16,$12)
+ sltu $10,$8,$10
+ daddu $9,$10
+
+ dmultu ($15,$13) # h1*r0
+ daddu $9,$1
+ sltu $1,$9,$1
+ mflo ($10,$15,$13)
+ mfhi ($11,$15,$13)
+ daddu $25,$1
+
+ dmultu ($17,$14) # h2*5*r1
+ daddu $9,$10
+ daddu $25,$11
+ mflo ($1,$17,$14)
+
+ dmultu ($15,$14) # h2*r0
+ sltu $10,$9,$10
+ daddu $25,$10
+ mflo ($2,$15,$14)
+
+ daddu $9,$1
+ daddu $25,$2
+ sltu $1,$9,$1
+ daddu $25,$1
+
+ li $10,-4 # final reduction
+ and $10,$25
+ dsrl $11,$25,2
+ andi $14,$25,3
+ daddu $10,$11
+ daddu $12,$8,$10
+ sltu $10,$12,$10
+ daddu $13,$9,$10
+ sltu $10,$13,$10
+ daddu $14,$14,$10
+
+ bnez $6,.Loop
+
+ sd $12,0($4) # store hash value
+ sd $13,8($4)
+ sd $14,16($4)
+
+ .set noreorder
+ ld $17,40($29) # epilogue
+ ld $16,32($29)
+ jr $31
+ daddu $29,6*8
+.end poly1305_blocks_internal
+
+.align 5
+.globl poly1305_emit_mips
+.ent poly1305_emit_mips
+poly1305_emit_mips:
+ .frame $29,0,$31
+ .set reorder
+
+ ld $10,0($4)
+ ld $11,8($4)
+ ld $1,16($4)
+
+ daddiu $8,$10,5 # compare to modulus
+ sltiu $2,$8,5
+ daddu $9,$11,$2
+ sltu $2,$9,$2
+ daddu $1,$1,$2
+
+ dsrl $1,2 # see if it carried/borrowed
+ dsubu $1,$0,$1
+ nor $2,$0,$1
+
+ and $8,$1
+ and $10,$2
+ and $9,$1
+ and $11,$2
+ or $8,$10
+ or $9,$11
+
+ lwu $10,0($6) # load nonce
+ lwu $11,4($6)
+ lwu $1,8($6)
+ lwu $2,12($6)
+ dsll $11,32
+ dsll $2,32
+ or $10,$11
+ or $1,$2
+
+ daddu $8,$10 # accumulate nonce
+ daddu $9,$1
+ sltu $10,$8,$10
+ daddu $9,$10
+
+ dsrl $10,$8,8 # write mac value
+ dsrl $11,$8,16
+ dsrl $1,$8,24
+ sb $8,0($5)
+ dsrl $2,$8,32
+ sb $10,1($5)
+ dsrl $10,$8,40
+ sb $11,2($5)
+ dsrl $11,$8,48
+ sb $1,3($5)
+ dsrl $1,$8,56
+ sb $2,4($5)
+ dsrl $2,$9,8
+ sb $10,5($5)
+ dsrl $10,$9,16
+ sb $11,6($5)
+ dsrl $11,$9,24
+ sb $1,7($5)
+
+ sb $9,8($5)
+ dsrl $1,$9,32
+ sb $2,9($5)
+ dsrl $2,$9,40
+ sb $10,10($5)
+ dsrl $10,$9,48
+ sb $11,11($5)
+ dsrl $11,$9,56
+ sb $1,12($5)
+ sb $2,13($5)
+ sb $10,14($5)
+ sb $11,15($5)
+
+ jr $31
+.end poly1305_emit_mips