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// Copyright 2015 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file.
// +build arm,!gccgo,!appengine,!nacl
#include "textflag.h"
// This code was translated into a form compatible with 5a from the public// domain source by Andrew Moon: github.com/floodyberry/poly1305-opt/blob/master/app/extensions/poly1305.
DATA ·poly1305_init_constants_armv6<>+0x00(SB)/4, $0x3ffffffDATA ·poly1305_init_constants_armv6<>+0x04(SB)/4, $0x3ffff03DATA ·poly1305_init_constants_armv6<>+0x08(SB)/4, $0x3ffc0ffDATA ·poly1305_init_constants_armv6<>+0x0c(SB)/4, $0x3f03fffDATA ·poly1305_init_constants_armv6<>+0x10(SB)/4, $0x00fffffGLOBL ·poly1305_init_constants_armv6<>(SB), 8, $20
// Warning: the linker may use R11 to synthesize certain instructions. Please// take care and verify that no synthetic instructions use it.
TEXT poly1305_init_ext_armv6<>(SB), NOSPLIT, $0 // Needs 16 bytes of stack and 64 bytes of space pointed to by R0. (It // might look like it's only 60 bytes of space but the final four bytes // will be written by another function.) We need to skip over four // bytes of stack because that's saving the value of 'g'. ADD $4, R13, R8 MOVM.IB [R4-R7], (R8) MOVM.IA.W (R1), [R2-R5] MOVW $·poly1305_init_constants_armv6<>(SB), R7 MOVW R2, R8 MOVW R2>>26, R9 MOVW R3>>20, g MOVW R4>>14, R11 MOVW R5>>8, R12 ORR R3<<6, R9, R9 ORR R4<<12, g, g ORR R5<<18, R11, R11 MOVM.IA (R7), [R2-R6] AND R8, R2, R2 AND R9, R3, R3 AND g, R4, R4 AND R11, R5, R5 AND R12, R6, R6 MOVM.IA.W [R2-R6], (R0) EOR R2, R2, R2 EOR R3, R3, R3 EOR R4, R4, R4 EOR R5, R5, R5 EOR R6, R6, R6 MOVM.IA.W [R2-R6], (R0) MOVM.IA.W (R1), [R2-R5] MOVM.IA [R2-R6], (R0) ADD $20, R13, R0 MOVM.DA (R0), [R4-R7] RET
#define MOVW_UNALIGNED(Rsrc, Rdst, Rtmp, offset) \
MOVBU (offset+0)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+0)(Rdst); \
MOVBU (offset+1)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+1)(Rdst); \
MOVBU (offset+2)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+2)(Rdst); \
MOVBU (offset+3)(Rsrc), Rtmp; \
MOVBU Rtmp, (offset+3)(Rdst)
TEXT poly1305_blocks_armv6<>(SB), NOSPLIT, $0 // Needs 24 bytes of stack for saved registers and then 88 bytes of // scratch space after that. We assume that 24 bytes at (R13) have // already been used: four bytes for the link register saved in the // prelude of poly1305_auth_armv6, four bytes for saving the value of g // in that function and 16 bytes of scratch space used around // poly1305_finish_ext_armv6_skip1. ADD $24, R13, R12 MOVM.IB [R4-R8, R14], (R12) MOVW R0, 88(R13) MOVW R1, 92(R13) MOVW R2, 96(R13) MOVW R1, R14 MOVW R2, R12 MOVW 56(R0), R8 WORD $0xe1180008 // TST R8, R8 not working see issue 5921 EOR R6, R6, R6 MOVW.EQ $(1<<24), R6 MOVW R6, 84(R13) ADD $116, R13, g MOVM.IA (R0), [R0-R9] MOVM.IA [R0-R4], (g) CMP $16, R12 BLO poly1305_blocks_armv6_done
poly1305_blocks_armv6_mainloop: WORD $0xe31e0003 // TST R14, #3 not working see issue 5921
BEQ poly1305_blocks_armv6_mainloop_aligned ADD $100, R13, g MOVW_UNALIGNED(R14, g, R0, 0) MOVW_UNALIGNED(R14, g, R0, 4) MOVW_UNALIGNED(R14, g, R0, 8) MOVW_UNALIGNED(R14, g, R0, 12) MOVM.IA (g), [R0-R3] ADD $16, R14 B poly1305_blocks_armv6_mainloop_loaded
poly1305_blocks_armv6_mainloop_aligned: MOVM.IA.W (R14), [R0-R3]
poly1305_blocks_armv6_mainloop_loaded: MOVW R0>>26, g MOVW R1>>20, R11 MOVW R2>>14, R12 MOVW R14, 92(R13) MOVW R3>>8, R4 ORR R1<<6, g, g ORR R2<<12, R11, R11 ORR R3<<18, R12, R12 BIC $0xfc000000, R0, R0 BIC $0xfc000000, g, g MOVW 84(R13), R3 BIC $0xfc000000, R11, R11 BIC $0xfc000000, R12, R12 ADD R0, R5, R5 ADD g, R6, R6 ORR R3, R4, R4 ADD R11, R7, R7 ADD $116, R13, R14 ADD R12, R8, R8 ADD R4, R9, R9 MOVM.IA (R14), [R0-R4] MULLU R4, R5, (R11, g) MULLU R3, R5, (R14, R12) MULALU R3, R6, (R11, g) MULALU R2, R6, (R14, R12) MULALU R2, R7, (R11, g) MULALU R1, R7, (R14, R12) ADD R4<<2, R4, R4 ADD R3<<2, R3, R3 MULALU R1, R8, (R11, g) MULALU R0, R8, (R14, R12) MULALU R0, R9, (R11, g) MULALU R4, R9, (R14, R12) MOVW g, 76(R13) MOVW R11, 80(R13) MOVW R12, 68(R13) MOVW R14, 72(R13) MULLU R2, R5, (R11, g) MULLU R1, R5, (R14, R12) MULALU R1, R6, (R11, g) MULALU R0, R6, (R14, R12) MULALU R0, R7, (R11, g) MULALU R4, R7, (R14, R12) ADD R2<<2, R2, R2 ADD R1<<2, R1, R1 MULALU R4, R8, (R11, g) MULALU R3, R8, (R14, R12) MULALU R3, R9, (R11, g) MULALU R2, R9, (R14, R12) MOVW g, 60(R13) MOVW R11, 64(R13) MOVW R12, 52(R13) MOVW R14, 56(R13) MULLU R0, R5, (R11, g) MULALU R4, R6, (R11, g) MULALU R3, R7, (R11, g) MULALU R2, R8, (R11, g) MULALU R1, R9, (R11, g) ADD $52, R13, R0 MOVM.IA (R0), [R0-R7] MOVW g>>26, R12 MOVW R4>>26, R14 ORR R11<<6, R12, R12 ORR R5<<6, R14, R14 BIC $0xfc000000, g, g BIC $0xfc000000, R4, R4 ADD.S R12, R0, R0 ADC $0, R1, R1 ADD.S R14, R6, R6 ADC $0, R7, R7 MOVW R0>>26, R12 MOVW R6>>26, R14 ORR R1<<6, R12, R12 ORR R7<<6, R14, R14 BIC $0xfc000000, R0, R0 BIC $0xfc000000, R6, R6 ADD R14<<2, R14, R14 ADD.S R12, R2, R2 ADC $0, R3, R3 ADD R14, g, g MOVW R2>>26, R12 MOVW g>>26, R14 ORR R3<<6, R12, R12 BIC $0xfc000000, g, R5 BIC $0xfc000000, R2, R7 ADD R12, R4, R4 ADD R14, R0, R0 MOVW R4>>26, R12 BIC $0xfc000000, R4, R8 ADD R12, R6, R9 MOVW 96(R13), R12 MOVW 92(R13), R14 MOVW R0, R6 CMP $32, R12 SUB $16, R12, R12 MOVW R12, 96(R13) BHS poly1305_blocks_armv6_mainloop
poly1305_blocks_armv6_done: MOVW 88(R13), R12 MOVW R5, 20(R12) MOVW R6, 24(R12) MOVW R7, 28(R12) MOVW R8, 32(R12) MOVW R9, 36(R12) ADD $48, R13, R0 MOVM.DA (R0), [R4-R8, R14] RET
#define MOVHUP_UNALIGNED(Rsrc, Rdst, Rtmp) \
MOVBU.P 1(Rsrc), Rtmp; \
MOVBU.P Rtmp, 1(Rdst); \
MOVBU.P 1(Rsrc), Rtmp; \
MOVBU.P Rtmp, 1(Rdst)
#define MOVWP_UNALIGNED(Rsrc, Rdst, Rtmp) \
MOVHUP_UNALIGNED(Rsrc, Rdst, Rtmp); \
MOVHUP_UNALIGNED(Rsrc, Rdst, Rtmp)
// func poly1305_auth_armv6(out *[16]byte, m *byte, mlen uint32, key *[32]key)TEXT ·poly1305_auth_armv6(SB), $196-16 // The value 196, just above, is the sum of 64 (the size of the context // structure) and 132 (the amount of stack needed). // // At this point, the stack pointer (R13) has been moved down. It // points to the saved link register and there's 196 bytes of free // space above it. // // The stack for this function looks like: // // +--------------------- // | // | 64 bytes of context structure // | // +--------------------- // | // | 112 bytes for poly1305_blocks_armv6 // | // +--------------------- // | 16 bytes of final block, constructed at // | poly1305_finish_ext_armv6_skip8 // +--------------------- // | four bytes of saved 'g' // +--------------------- // | lr, saved by prelude <- R13 points here // +--------------------- MOVW g, 4(R13)
MOVW out+0(FP), R4 MOVW m+4(FP), R5 MOVW mlen+8(FP), R6 MOVW key+12(FP), R7
ADD $136, R13, R0 // 136 = 4 + 4 + 16 + 112 MOVW R7, R1
// poly1305_init_ext_armv6 will write to the stack from R13+4, but // that's ok because none of the other values have been written yet. BL poly1305_init_ext_armv6<>(SB) BIC.S $15, R6, R2 BEQ poly1305_auth_armv6_noblocks ADD $136, R13, R0 MOVW R5, R1 ADD R2, R5, R5 SUB R2, R6, R6 BL poly1305_blocks_armv6<>(SB)
poly1305_auth_armv6_noblocks: ADD $136, R13, R0 MOVW R5, R1 MOVW R6, R2 MOVW R4, R3
MOVW R0, R5 MOVW R1, R6 MOVW R2, R7 MOVW R3, R8 AND.S R2, R2, R2 BEQ poly1305_finish_ext_armv6_noremaining EOR R0, R0 ADD $8, R13, R9 // 8 = offset to 16 byte scratch space MOVW R0, (R9) MOVW R0, 4(R9) MOVW R0, 8(R9) MOVW R0, 12(R9) WORD $0xe3110003 // TST R1, #3 not working see issue 5921
BEQ poly1305_finish_ext_armv6_aligned WORD $0xe3120008 // TST R2, #8 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip8 MOVWP_UNALIGNED(R1, R9, g) MOVWP_UNALIGNED(R1, R9, g)
poly1305_finish_ext_armv6_skip8: WORD $0xe3120004 // TST $4, R2 not working see issue 5921 BEQ poly1305_finish_ext_armv6_skip4 MOVWP_UNALIGNED(R1, R9, g)
poly1305_finish_ext_armv6_skip4: WORD $0xe3120002 // TST $2, R2 not working see issue 5921 BEQ poly1305_finish_ext_armv6_skip2 MOVHUP_UNALIGNED(R1, R9, g) B poly1305_finish_ext_armv6_skip2
poly1305_finish_ext_armv6_aligned: WORD $0xe3120008 // TST R2, #8 not working see issue 5921
BEQ poly1305_finish_ext_armv6_skip8_aligned MOVM.IA.W (R1), [g-R11] MOVM.IA.W [g-R11], (R9)
poly1305_finish_ext_armv6_skip8_aligned: WORD $0xe3120004 // TST $4, R2 not working see issue 5921 BEQ poly1305_finish_ext_armv6_skip4_aligned MOVW.P 4(R1), g MOVW.P g, 4(R9)
poly1305_finish_ext_armv6_skip4_aligned: WORD $0xe3120002 // TST $2, R2 not working see issue 5921 BEQ poly1305_finish_ext_armv6_skip2 MOVHU.P 2(R1), g MOVH.P g, 2(R9)
poly1305_finish_ext_armv6_skip2: WORD $0xe3120001 // TST $1, R2 not working see issue 5921 BEQ poly1305_finish_ext_armv6_skip1 MOVBU.P 1(R1), g MOVBU.P g, 1(R9)
poly1305_finish_ext_armv6_skip1: MOVW $1, R11 MOVBU R11, 0(R9) MOVW R11, 56(R5) MOVW R5, R0 ADD $8, R13, R1 MOVW $16, R2 BL poly1305_blocks_armv6<>(SB)
poly1305_finish_ext_armv6_noremaining: MOVW 20(R5), R0 MOVW 24(R5), R1 MOVW 28(R5), R2 MOVW 32(R5), R3 MOVW 36(R5), R4 MOVW R4>>26, R12 BIC $0xfc000000, R4, R4 ADD R12<<2, R12, R12 ADD R12, R0, R0 MOVW R0>>26, R12 BIC $0xfc000000, R0, R0 ADD R12, R1, R1 MOVW R1>>26, R12 BIC $0xfc000000, R1, R1 ADD R12, R2, R2 MOVW R2>>26, R12 BIC $0xfc000000, R2, R2 ADD R12, R3, R3 MOVW R3>>26, R12 BIC $0xfc000000, R3, R3 ADD R12, R4, R4 ADD $5, R0, R6 MOVW R6>>26, R12 BIC $0xfc000000, R6, R6 ADD R12, R1, R7 MOVW R7>>26, R12 BIC $0xfc000000, R7, R7 ADD R12, R2, g MOVW g>>26, R12 BIC $0xfc000000, g, g ADD R12, R3, R11 MOVW $-(1<<26), R12 ADD R11>>26, R12, R12 BIC $0xfc000000, R11, R11 ADD R12, R4, R9 MOVW R9>>31, R12 SUB $1, R12 AND R12, R6, R6 AND R12, R7, R7 AND R12, g, g AND R12, R11, R11 AND R12, R9, R9 MVN R12, R12 AND R12, R0, R0 AND R12, R1, R1 AND R12, R2, R2 AND R12, R3, R3 AND R12, R4, R4 ORR R6, R0, R0 ORR R7, R1, R1 ORR g, R2, R2 ORR R11, R3, R3 ORR R9, R4, R4 ORR R1<<26, R0, R0 MOVW R1>>6, R1 ORR R2<<20, R1, R1 MOVW R2>>12, R2 ORR R3<<14, R2, R2 MOVW R3>>18, R3 ORR R4<<8, R3, R3 MOVW 40(R5), R6 MOVW 44(R5), R7 MOVW 48(R5), g MOVW 52(R5), R11 ADD.S R6, R0, R0 ADC.S R7, R1, R1 ADC.S g, R2, R2 ADC.S R11, R3, R3 MOVM.IA [R0-R3], (R8) MOVW R5, R12 EOR R0, R0, R0 EOR R1, R1, R1 EOR R2, R2, R2 EOR R3, R3, R3 EOR R4, R4, R4 EOR R5, R5, R5 EOR R6, R6, R6 EOR R7, R7, R7 MOVM.IA.W [R0-R7], (R12) MOVM.IA [R0-R7], (R12) MOVW 4(R13), g RET
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