--- /dev/null
+/* Optimized SSE2 implementation of ChaCha20 cipher.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* chacha20-amd64-ssse3.S - SSSE3 implementation of ChaCha20 cipher
+
+ Copyright (C) 2017-2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
+
+ This file is part of Libgcrypt.
+
+ Libgcrypt is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of
+ the License, or (at your option) any later version.
+
+ Libgcrypt is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this program; if not, see <https://www.gnu.org/licenses/>.
+*/
+
+/* Based on D. J. Bernstein reference implementation at
+ http://cr.yp.to/chacha.html:
+
+ chacha-regs.c version 20080118
+ D. J. Bernstein
+ Public domain. */
+
+#include <sysdep.h>
+
+#ifdef PIC
+# define rRIP (%rip)
+#else
+# define rRIP
+#endif
+
+/* 'ret' instruction replacement for straight-line speculation mitigation */
+#define ret_spec_stop \
+ ret; int3;
+
+/* register macros */
+#define INPUT %rdi
+#define DST %rsi
+#define SRC %rdx
+#define NBLKS %rcx
+#define ROUND %eax
+
+/* stack structure */
+#define STACK_VEC_X12 (16)
+#define STACK_VEC_X13 (16 + STACK_VEC_X12)
+#define STACK_TMP (16 + STACK_VEC_X13)
+#define STACK_TMP1 (16 + STACK_TMP)
+#define STACK_TMP2 (16 + STACK_TMP1)
+
+#define STACK_MAX (16 + STACK_TMP2)
+
+/* vector registers */
+#define X0 %xmm0
+#define X1 %xmm1
+#define X2 %xmm2
+#define X3 %xmm3
+#define X4 %xmm4
+#define X5 %xmm5
+#define X6 %xmm6
+#define X7 %xmm7
+#define X8 %xmm8
+#define X9 %xmm9
+#define X10 %xmm10
+#define X11 %xmm11
+#define X12 %xmm12
+#define X13 %xmm13
+#define X14 %xmm14
+#define X15 %xmm15
+
+/**********************************************************************
+ helper macros
+ **********************************************************************/
+
+/* 4x4 32-bit integer matrix transpose */
+#define TRANSPOSE_4x4(x0, x1, x2, x3, t1, t2, t3) \
+ movdqa x0, t2; \
+ punpckhdq x1, t2; \
+ punpckldq x1, x0; \
+ \
+ movdqa x2, t1; \
+ punpckldq x3, t1; \
+ punpckhdq x3, x2; \
+ \
+ movdqa x0, x1; \
+ punpckhqdq t1, x1; \
+ punpcklqdq t1, x0; \
+ \
+ movdqa t2, x3; \
+ punpckhqdq x2, x3; \
+ punpcklqdq x2, t2; \
+ movdqa t2, x2;
+
+/* fill xmm register with 32-bit value from memory */
+#define PBROADCASTD(mem32, xreg) \
+ movd mem32, xreg; \
+ pshufd $0, xreg, xreg;
+
+/**********************************************************************
+ 4-way chacha20
+ **********************************************************************/
+
+#define ROTATE2(v1,v2,c,tmp1,tmp2) \
+ movdqa v1, tmp1; \
+ movdqa v2, tmp2; \
+ psrld $(32 - (c)), v1; \
+ pslld $(c), tmp1; \
+ paddb tmp1, v1; \
+ psrld $(32 - (c)), v2; \
+ pslld $(c), tmp2; \
+ paddb tmp2, v2;
+
+#define XOR(ds,s) \
+ pxor s, ds;
+
+#define PLUS(ds,s) \
+ paddd s, ds;
+
+#define QUARTERROUND2(a1,b1,c1,d1,a2,b2,c2,d2,ign,tmp1,tmp2) \
+ PLUS(a1,b1); PLUS(a2,b2); XOR(d1,a1); XOR(d2,a2); \
+ ROTATE2(d1, d2, 16, tmp1, tmp2); \
+ PLUS(c1,d1); PLUS(c2,d2); XOR(b1,c1); XOR(b2,c2); \
+ ROTATE2(b1, b2, 12, tmp1, tmp2); \
+ PLUS(a1,b1); PLUS(a2,b2); XOR(d1,a1); XOR(d2,a2); \
+ ROTATE2(d1, d2, 8, tmp1, tmp2); \
+ PLUS(c1,d1); PLUS(c2,d2); XOR(b1,c1); XOR(b2,c2); \
+ ROTATE2(b1, b2, 7, tmp1, tmp2);
+
+ .section .text.sse2,"ax",@progbits
+
+chacha20_data:
+ .align 16
+L(counter1):
+ .long 1,0,0,0
+L(inc_counter):
+ .long 0,1,2,3
+L(unsigned_cmp):
+ .long 0x80000000,0x80000000,0x80000000,0x80000000
+
+ .hidden __chacha20_sse2_blocks4
+ENTRY (__chacha20_sse2_blocks4)
+ /* input:
+ * %rdi: input
+ * %rsi: dst
+ * %rdx: src
+ * %rcx: nblks (multiple of 4)
+ */
+
+ pushq %rbp;
+ cfi_adjust_cfa_offset(8);
+ cfi_rel_offset(rbp, 0)
+ movq %rsp, %rbp;
+ cfi_def_cfa_register(%rbp);
+
+ subq $STACK_MAX, %rsp;
+ andq $~15, %rsp;
+
+L(loop4):
+ mov $20, ROUND;
+
+ /* Construct counter vectors X12 and X13 */
+ movdqa L(inc_counter) rRIP, X0;
+ movdqa L(unsigned_cmp) rRIP, X2;
+ PBROADCASTD((12 * 4)(INPUT), X12);
+ PBROADCASTD((13 * 4)(INPUT), X13);
+ paddd X0, X12;
+ movdqa X12, X1;
+ pxor X2, X0;
+ pxor X2, X1;
+ pcmpgtd X1, X0;
+ psubd X0, X13;
+ movdqa X12, (STACK_VEC_X12)(%rsp);
+ movdqa X13, (STACK_VEC_X13)(%rsp);
+
+ /* Load vectors */
+ PBROADCASTD((0 * 4)(INPUT), X0);
+ PBROADCASTD((1 * 4)(INPUT), X1);
+ PBROADCASTD((2 * 4)(INPUT), X2);
+ PBROADCASTD((3 * 4)(INPUT), X3);
+ PBROADCASTD((4 * 4)(INPUT), X4);
+ PBROADCASTD((5 * 4)(INPUT), X5);
+ PBROADCASTD((6 * 4)(INPUT), X6);
+ PBROADCASTD((7 * 4)(INPUT), X7);
+ PBROADCASTD((8 * 4)(INPUT), X8);
+ PBROADCASTD((9 * 4)(INPUT), X9);
+ PBROADCASTD((10 * 4)(INPUT), X10);
+ PBROADCASTD((11 * 4)(INPUT), X11);
+ PBROADCASTD((14 * 4)(INPUT), X14);
+ PBROADCASTD((15 * 4)(INPUT), X15);
+ movdqa X11, (STACK_TMP)(%rsp);
+ movdqa X15, (STACK_TMP1)(%rsp);
+
+L(round2_4):
+ QUARTERROUND2(X0, X4, X8, X12, X1, X5, X9, X13, tmp:=,X11,X15)
+ movdqa (STACK_TMP)(%rsp), X11;
+ movdqa (STACK_TMP1)(%rsp), X15;
+ movdqa X8, (STACK_TMP)(%rsp);
+ movdqa X9, (STACK_TMP1)(%rsp);
+ QUARTERROUND2(X2, X6, X10, X14, X3, X7, X11, X15, tmp:=,X8,X9)
+ QUARTERROUND2(X0, X5, X10, X15, X1, X6, X11, X12, tmp:=,X8,X9)
+ movdqa (STACK_TMP)(%rsp), X8;
+ movdqa (STACK_TMP1)(%rsp), X9;
+ movdqa X11, (STACK_TMP)(%rsp);
+ movdqa X15, (STACK_TMP1)(%rsp);
+ QUARTERROUND2(X2, X7, X8, X13, X3, X4, X9, X14, tmp:=,X11,X15)
+ sub $2, ROUND;
+ jnz L(round2_4);
+
+ /* tmp := X15 */
+ movdqa (STACK_TMP)(%rsp), X11;
+ PBROADCASTD((0 * 4)(INPUT), X15);
+ PLUS(X0, X15);
+ PBROADCASTD((1 * 4)(INPUT), X15);
+ PLUS(X1, X15);
+ PBROADCASTD((2 * 4)(INPUT), X15);
+ PLUS(X2, X15);
+ PBROADCASTD((3 * 4)(INPUT), X15);
+ PLUS(X3, X15);
+ PBROADCASTD((4 * 4)(INPUT), X15);
+ PLUS(X4, X15);
+ PBROADCASTD((5 * 4)(INPUT), X15);
+ PLUS(X5, X15);
+ PBROADCASTD((6 * 4)(INPUT), X15);
+ PLUS(X6, X15);
+ PBROADCASTD((7 * 4)(INPUT), X15);
+ PLUS(X7, X15);
+ PBROADCASTD((8 * 4)(INPUT), X15);
+ PLUS(X8, X15);
+ PBROADCASTD((9 * 4)(INPUT), X15);
+ PLUS(X9, X15);
+ PBROADCASTD((10 * 4)(INPUT), X15);
+ PLUS(X10, X15);
+ PBROADCASTD((11 * 4)(INPUT), X15);
+ PLUS(X11, X15);
+ movdqa (STACK_VEC_X12)(%rsp), X15;
+ PLUS(X12, X15);
+ movdqa (STACK_VEC_X13)(%rsp), X15;
+ PLUS(X13, X15);
+ movdqa X13, (STACK_TMP)(%rsp);
+ PBROADCASTD((14 * 4)(INPUT), X15);
+ PLUS(X14, X15);
+ movdqa (STACK_TMP1)(%rsp), X15;
+ movdqa X14, (STACK_TMP1)(%rsp);
+ PBROADCASTD((15 * 4)(INPUT), X13);
+ PLUS(X15, X13);
+ movdqa X15, (STACK_TMP2)(%rsp);
+
+ /* Update counter */
+ addq $4, (12 * 4)(INPUT);
+
+ TRANSPOSE_4x4(X0, X1, X2, X3, X13, X14, X15);
+ movdqu X0, (64 * 0 + 16 * 0)(DST)
+ movdqu X1, (64 * 1 + 16 * 0)(DST)
+ movdqu X2, (64 * 2 + 16 * 0)(DST)
+ movdqu X3, (64 * 3 + 16 * 0)(DST)
+ TRANSPOSE_4x4(X4, X5, X6, X7, X0, X1, X2);
+ movdqa (STACK_TMP)(%rsp), X13;
+ movdqa (STACK_TMP1)(%rsp), X14;
+ movdqa (STACK_TMP2)(%rsp), X15;
+ movdqu X4, (64 * 0 + 16 * 1)(DST)
+ movdqu X5, (64 * 1 + 16 * 1)(DST)
+ movdqu X6, (64 * 2 + 16 * 1)(DST)
+ movdqu X7, (64 * 3 + 16 * 1)(DST)
+ TRANSPOSE_4x4(X8, X9, X10, X11, X0, X1, X2);
+ movdqu X8, (64 * 0 + 16 * 2)(DST)
+ movdqu X9, (64 * 1 + 16 * 2)(DST)
+ movdqu X10, (64 * 2 + 16 * 2)(DST)
+ movdqu X11, (64 * 3 + 16 * 2)(DST)
+ TRANSPOSE_4x4(X12, X13, X14, X15, X0, X1, X2);
+ movdqu X12, (64 * 0 + 16 * 3)(DST)
+ movdqu X13, (64 * 1 + 16 * 3)(DST)
+ movdqu X14, (64 * 2 + 16 * 3)(DST)
+ movdqu X15, (64 * 3 + 16 * 3)(DST)
+
+ sub $4, NBLKS;
+ lea (4 * 64)(DST), DST;
+ lea (4 * 64)(SRC), SRC;
+ jnz L(loop4);
+
+ /* eax zeroed by round loop. */
+ leave;
+ cfi_adjust_cfa_offset(-8)
+ cfi_def_cfa_register(%rsp);
+ ret_spec_stop;
+END (__chacha20_sse2_blocks4)
projects / platform / upstream / glibc.git / commitdiff