--- /dev/null
+/*
+ * Copyright 2012 pooler@litecoinpool.org
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version. See COPYING for more details.
+ */
+
+#if defined(__arm__) && defined(__APCS_32__)
+
+#if defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) || \
+ defined(__ARM_ARCH_5TEJ__) || defined(__ARM_ARCH_6__) || \
+ defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || \
+ defined(__ARM_ARCH_6M__) || defined(__ARM_ARCH_6T2__) || \
+ defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__)
+#define __ARM_ARCH_5E_OR_6__
+#endif
+
+#if defined(__ARM_ARCH_5E_OR_6__) || defined(__ARM_ARCH_7__) || \
+ defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || \
+ defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
+#define __ARM_ARCH_5E_OR_6_OR_7__
+#endif
+
+#ifdef __ARM_ARCH_5E_OR_6__
+
+.macro scrypt_shuffle
+ add lr, r0, #9*4
+ ldmia r0, {r2-r7}
+ ldmia lr, {r2, r8-r12, lr}
+ str r3, [r0, #5*4]
+ str r5, [r0, #15*4]
+ str r6, [r0, #12*4]
+ str r7, [r0, #1*4]
+ ldr r5, [r0, #7*4]
+ str r2, [r0, #13*4]
+ str r8, [r0, #2*4]
+ strd r4, [r0, #10*4]
+ str r9, [r0, #7*4]
+ str r10, [r0, #4*4]
+ str r11, [r0, #9*4]
+ str lr, [r0, #3*4]
+
+ add r2, r0, #64+0*4
+ add lr, r0, #64+9*4
+ ldmia r2, {r2-r7}
+ ldmia lr, {r2, r8-r12, lr}
+ str r3, [r0, #64+5*4]
+ str r5, [r0, #64+15*4]
+ str r6, [r0, #64+12*4]
+ str r7, [r0, #64+1*4]
+ ldr r5, [r0, #64+7*4]
+ str r2, [r0, #64+13*4]
+ str r8, [r0, #64+2*4]
+ strd r4, [r0, #64+10*4]
+ str r9, [r0, #64+7*4]
+ str r10, [r0, #64+4*4]
+ str r11, [r0, #64+9*4]
+ str lr, [r0, #64+3*4]
+.endm
+
+.macro salsa8_core_doubleround_body
+ add r6, r2, r6
+ add r7, r3, r7
+ eor r10, r10, r6, ror #25
+ add r6, r0, r4
+ eor r11, r11, r7, ror #25
+ add r7, r1, r5
+ strd r10, [sp, #14*4]
+ eor r12, r12, r6, ror #25
+ eor lr, lr, r7, ror #25
+
+ ldrd r6, [sp, #10*4]
+ add r2, r10, r2
+ add r3, r11, r3
+ eor r6, r6, r2, ror #23
+ add r2, r12, r0
+ eor r7, r7, r3, ror #23
+ add r3, lr, r1
+ strd r6, [sp, #10*4]
+ eor r8, r8, r2, ror #23
+ eor r9, r9, r3, ror #23
+
+ ldrd r2, [sp, #6*4]
+ add r10, r6, r10
+ add r11, r7, r11
+ eor r2, r2, r10, ror #19
+ add r10, r8, r12
+ eor r3, r3, r11, ror #19
+ add r11, r9, lr
+ eor r4, r4, r10, ror #19
+ eor r5, r5, r11, ror #19
+
+ ldrd r10, [sp, #2*4]
+ add r6, r2, r6
+ add r7, r3, r7
+ eor r10, r10, r6, ror #14
+ add r6, r4, r8
+ eor r11, r11, r7, ror #14
+ add r7, r5, r9
+ eor r0, r0, r6, ror #14
+ eor r1, r1, r7, ror #14
+
+
+ ldrd r6, [sp, #14*4]
+ strd r2, [sp, #6*4]
+ strd r10, [sp, #2*4]
+ add r6, r11, r6
+ add r7, r0, r7
+ eor r4, r4, r6, ror #25
+ add r6, r1, r12
+ eor r5, r5, r7, ror #25
+ add r7, r10, lr
+ eor r2, r2, r6, ror #25
+ eor r3, r3, r7, ror #25
+ strd r2, [sp, #6*4]
+
+ add r10, r3, r10
+ ldrd r6, [sp, #10*4]
+ add r11, r4, r11
+ eor r8, r8, r10, ror #23
+ add r10, r5, r0
+ eor r9, r9, r11, ror #23
+ add r11, r2, r1
+ eor r6, r6, r10, ror #23
+ eor r7, r7, r11, ror #23
+ strd r6, [sp, #10*4]
+
+ add r2, r7, r2
+ ldrd r10, [sp, #14*4]
+ add r3, r8, r3
+ eor r12, r12, r2, ror #19
+ add r2, r9, r4
+ eor lr, lr, r3, ror #19
+ add r3, r6, r5
+ eor r10, r10, r2, ror #19
+ eor r11, r11, r3, ror #19
+
+ ldrd r2, [sp, #2*4]
+ add r6, r11, r6
+ add r7, r12, r7
+ eor r0, r0, r6, ror #14
+ add r6, lr, r8
+ eor r1, r1, r7, ror #14
+ add r7, r10, r9
+ eor r2, r2, r6, ror #14
+ eor r3, r3, r7, ror #14
+.endm
+
+.macro salsa8_core
+ ldmia sp, {r0-r12, lr}
+
+ ldrd r10, [sp, #14*4]
+ salsa8_core_doubleround_body
+ ldrd r6, [sp, #6*4]
+ strd r2, [sp, #2*4]
+ strd r10, [sp, #14*4]
+ salsa8_core_doubleround_body
+ ldrd r6, [sp, #6*4]
+ strd r2, [sp, #2*4]
+ strd r10, [sp, #14*4]
+ salsa8_core_doubleround_body
+ ldrd r6, [sp, #6*4]
+ strd r2, [sp, #2*4]
+ strd r10, [sp, #14*4]
+ salsa8_core_doubleround_body
+
+ stmia sp, {r0-r5}
+ strd r8, [sp, #8*4]
+ str r12, [sp, #12*4]
+ str lr, [sp, #13*4]
+ strd r10, [sp, #14*4]
+.endm
+
+#else
+
+.macro scrypt_shuffle
+.endm
+
+.macro salsa8_core_doubleround_body
+ ldr r8, [sp, #8*4]
+ add r11, r11, r10
+ ldr lr, [sp, #13*4]
+ add r12, r12, r3
+ eor r2, r2, r11, ror #23
+ add r11, r4, r0
+ eor r7, r7, r12, ror #23
+ add r12, r9, r5
+ str r9, [sp, #9*4]
+ eor r8, r8, r11, ror #23
+ str r10, [sp, #14*4]
+ eor lr, lr, r12, ror #23
+
+ ldr r11, [sp, #11*4]
+ add r9, lr, r9
+ ldr r12, [sp, #12*4]
+ add r10, r2, r10
+ eor r1, r1, r9, ror #19
+ add r9, r7, r3
+ eor r6, r6, r10, ror #19
+ add r10, r8, r4
+ str r8, [sp, #8*4]
+ eor r11, r11, r9, ror #19
+ str lr, [sp, #13*4]
+ eor r12, r12, r10, ror #19
+
+ ldr r9, [sp, #10*4]
+ add r8, r12, r8
+ ldr r10, [sp, #15*4]
+ add lr, r1, lr
+ eor r0, r0, r8, ror #14
+ add r8, r6, r2
+ eor r5, r5, lr, ror #14
+ add lr, r11, r7
+ eor r9, r9, r8, ror #14
+ ldr r8, [sp, #9*4]
+ eor r10, r10, lr, ror #14
+ ldr lr, [sp, #14*4]
+
+
+ add r8, r9, r8
+ str r9, [sp, #10*4]
+ add lr, r10, lr
+ str r10, [sp, #15*4]
+ eor r11, r11, r8, ror #25
+ add r8, r0, r3
+ eor r12, r12, lr, ror #25
+ add lr, r5, r4
+ eor r1, r1, r8, ror #25
+ ldr r8, [sp, #8*4]
+ eor r6, r6, lr, ror #25
+
+ add r9, r11, r9
+ ldr lr, [sp, #13*4]
+ add r10, r12, r10
+ eor r8, r8, r9, ror #23
+ add r9, r1, r0
+ eor lr, lr, r10, ror #23
+ add r10, r6, r5
+ str r11, [sp, #11*4]
+ eor r2, r2, r9, ror #23
+ str r12, [sp, #12*4]
+ eor r7, r7, r10, ror #23
+
+ ldr r9, [sp, #9*4]
+ add r11, r8, r11
+ ldr r10, [sp, #14*4]
+ add r12, lr, r12
+ eor r9, r9, r11, ror #19
+ add r11, r2, r1
+ eor r10, r10, r12, ror #19
+ add r12, r7, r6
+ str r8, [sp, #8*4]
+ eor r3, r3, r11, ror #19
+ str lr, [sp, #13*4]
+ eor r4, r4, r12, ror #19
+.endm
+
+.macro salsa8_core
+ ldmia sp, {r0-r7}
+
+ ldr r12, [sp, #15*4]
+ ldr r8, [sp, #11*4]
+ ldr lr, [sp, #12*4]
+
+ ldr r9, [sp, #9*4]
+ add r8, r8, r12
+ ldr r11, [sp, #10*4]
+ add lr, lr, r0
+ eor r3, r3, r8, ror #25
+ add r8, r5, r1
+ ldr r10, [sp, #14*4]
+ eor r4, r4, lr, ror #25
+ add lr, r11, r6
+ eor r9, r9, r8, ror #25
+ eor r10, r10, lr, ror #25
+
+ salsa8_core_doubleround_body
+
+ ldr r11, [sp, #10*4]
+ add r8, r9, r8
+ ldr r12, [sp, #15*4]
+ add lr, r10, lr
+ eor r11, r11, r8, ror #14
+ add r8, r3, r2
+ eor r12, r12, lr, ror #14
+ add lr, r4, r7
+ eor r0, r0, r8, ror #14
+ ldr r8, [sp, #11*4]
+ eor r5, r5, lr, ror #14
+ ldr lr, [sp, #12*4]
+
+ add r8, r8, r12
+ str r11, [sp, #10*4]
+ add lr, lr, r0
+ str r12, [sp, #15*4]
+ eor r3, r3, r8, ror #25
+ add r8, r5, r1
+ eor r4, r4, lr, ror #25
+ add lr, r11, r6
+ str r9, [sp, #9*4]
+ eor r9, r9, r8, ror #25
+ str r10, [sp, #14*4]
+ eor r10, r10, lr, ror #25
+
+ salsa8_core_doubleround_body
+
+ ldr r11, [sp, #10*4]
+ add r8, r9, r8
+ ldr r12, [sp, #15*4]
+ add lr, r10, lr
+ eor r11, r11, r8, ror #14
+ add r8, r3, r2
+ eor r12, r12, lr, ror #14
+ add lr, r4, r7
+ eor r0, r0, r8, ror #14
+ ldr r8, [sp, #11*4]
+ eor r5, r5, lr, ror #14
+ ldr lr, [sp, #12*4]
+
+ add r8, r8, r12
+ str r11, [sp, #10*4]
+ add lr, lr, r0
+ str r12, [sp, #15*4]
+ eor r3, r3, r8, ror #25
+ add r8, r5, r1
+ eor r4, r4, lr, ror #25
+ add lr, r11, r6
+ str r9, [sp, #9*4]
+ eor r9, r9, r8, ror #25
+ str r10, [sp, #14*4]
+ eor r10, r10, lr, ror #25
+
+ salsa8_core_doubleround_body
+
+ ldr r11, [sp, #10*4]
+ add r8, r9, r8
+ ldr r12, [sp, #15*4]
+ add lr, r10, lr
+ eor r11, r11, r8, ror #14
+ add r8, r3, r2
+ eor r12, r12, lr, ror #14
+ add lr, r4, r7
+ eor r0, r0, r8, ror #14
+ ldr r8, [sp, #11*4]
+ eor r5, r5, lr, ror #14
+ ldr lr, [sp, #12*4]
+
+ add r8, r8, r12
+ str r11, [sp, #10*4]
+ add lr, lr, r0
+ str r12, [sp, #15*4]
+ eor r3, r3, r8, ror #25
+ add r8, r5, r1
+ eor r4, r4, lr, ror #25
+ add lr, r11, r6
+ str r9, [sp, #9*4]
+ eor r9, r9, r8, ror #25
+ str r10, [sp, #14*4]
+ eor r10, r10, lr, ror #25
+
+ salsa8_core_doubleround_body
+
+ ldr r11, [sp, #10*4]
+ add r8, r9, r8
+ ldr r12, [sp, #15*4]
+ add lr, r10, lr
+ str r9, [sp, #9*4]
+ eor r11, r11, r8, ror #14
+ eor r12, r12, lr, ror #14
+ add r8, r3, r2
+ str r10, [sp, #14*4]
+ add lr, r4, r7
+ str r11, [sp, #10*4]
+ eor r0, r0, r8, ror #14
+ str r12, [sp, #15*4]
+ eor r5, r5, lr, ror #14
+
+ stmia sp, {r0-r7}
+.endm
+
+#endif
+
+
+.macro scrypt_core_macro1a_x4
+ ldmia r0, {r4-r7}
+ ldmia lr!, {r8-r11}
+ stmia r1!, {r4-r7}
+ stmia r3!, {r8-r11}
+ eor r4, r4, r8
+ eor r5, r5, r9
+ eor r6, r6, r10
+ eor r7, r7, r11
+ stmia r0!, {r4-r7}
+ stmia r12!, {r4-r7}
+.endm
+
+.macro scrypt_core_macro1b_x4
+ ldmia r3!, {r8-r11}
+ ldmia r2, {r4-r7}
+ eor r8, r8, r4
+ eor r9, r9, r5
+ eor r10, r10, r6
+ eor r11, r11, r7
+ ldmia r0, {r4-r7}
+ stmia r2!, {r8-r11}
+ eor r4, r4, r8
+ eor r5, r5, r9
+ eor r6, r6, r10
+ eor r7, r7, r11
+ ldmia r1!, {r8-r11}
+ eor r4, r4, r8
+ eor r5, r5, r9
+ eor r6, r6, r10
+ eor r7, r7, r11
+ stmia r0!, {r4-r7}
+ stmia r12!, {r4-r7}
+.endm
+
+.macro scrypt_core_macro2_x4
+ ldmia r12, {r4-r7}
+ ldmia r0, {r8-r11}
+ add r4, r4, r8
+ add r5, r5, r9
+ add r6, r6, r10
+ add r7, r7, r11
+ stmia r0!, {r4-r7}
+ ldmia r2, {r8-r11}
+ eor r4, r4, r8
+ eor r5, r5, r9
+ eor r6, r6, r10
+ eor r7, r7, r11
+ stmia r2!, {r4-r7}
+ stmia r12!, {r4-r7}
+.endm
+
+.macro scrypt_core_macro3_x4
+ ldmia r1!, {r4-r7}
+ ldmia r0, {r8-r11}
+ add r4, r4, r8
+ add r5, r5, r9
+ add r6, r6, r10
+ add r7, r7, r11
+ stmia r0!, {r4-r7}
+.endm
+
+.macro scrypt_core_macro3_x6
+ ldmia r1!, {r2-r7}
+ ldmia r0, {r8-r12, lr}
+ add r2, r2, r8
+ add r3, r3, r9
+ add r4, r4, r10
+ add r5, r5, r11
+ add r6, r6, r12
+ add r7, r7, lr
+ stmia r0!, {r2-r7}
+.endm
+
+
+ .text
+ .code 32
+ .align 2
+ .globl scrypt_core
+ .globl _scrypt_core
+#ifdef __ELF__
+ .type scrypt_core, %function
+#endif
+scrypt_core:
+_scrypt_core:
+ stmfd sp!, {r4-r11, lr}
+ mov r12, sp
+ sub sp, sp, #21*4
+ bic sp, sp, #63
+ str r12, [sp, #20*4]
+
+ scrypt_shuffle
+
+ str r0, [sp, #16*4]
+ add r12, r1, #1024*32*4
+ str r12, [sp, #18*4]
+scrypt_core_loop1:
+ add lr, r0, #16*4
+ add r3, r1, #16*4
+ mov r12, sp
+ scrypt_core_macro1a_x4
+ scrypt_core_macro1a_x4
+ scrypt_core_macro1a_x4
+ scrypt_core_macro1a_x4
+ str r1, [sp, #17*4]
+
+ salsa8_core
+
+ ldr r0, [sp, #16*4]
+ mov r12, sp
+ add r2, r0, #16*4
+ scrypt_core_macro2_x4
+ scrypt_core_macro2_x4
+ scrypt_core_macro2_x4
+ scrypt_core_macro2_x4
+
+ salsa8_core
+
+ ldr r0, [sp, #16*4]
+ mov r1, sp
+ add r0, r0, #16*4
+ scrypt_core_macro3_x6
+ scrypt_core_macro3_x6
+ ldr r3, [sp, #17*4]
+ ldr r12, [sp, #18*4]
+ scrypt_core_macro3_x4
+
+ add r1, r3, #16*4
+ sub r0, r0, #32*4
+ cmp r1, r12
+ bne scrypt_core_loop1
+
+ ldr r4, [r0, #16*4]
+ sub r1, r1, #1024*32*4
+ str r1, [sp, #17*4]
+ mov r4, r4, lsl #32-10
+ mov r12, #1024
+ add r1, r1, r4, lsr #32-10-7
+scrypt_core_loop2:
+ add r2, r0, #16*4
+ add r3, r1, #16*4
+ str r12, [sp, #18*4]
+ mov r12, sp
+#ifdef __ARM_ARCH_5E_OR_6_OR_7__
+ pld [r1, #24*4]
+ pld [r1, #8*4]
+#endif
+ scrypt_core_macro1b_x4
+ scrypt_core_macro1b_x4
+ scrypt_core_macro1b_x4
+ scrypt_core_macro1b_x4
+
+ salsa8_core
+
+ ldr r0, [sp, #16*4]
+ mov r12, sp
+ add r2, r0, #16*4
+ scrypt_core_macro2_x4
+ scrypt_core_macro2_x4
+ scrypt_core_macro2_x4
+ scrypt_core_macro2_x4
+
+ salsa8_core
+
+ ldr r0, [sp, #16*4]
+ mov r1, sp
+ ldr r3, [sp, #17*4]
+ add r0, r0, #16*4
+ scrypt_core_macro3_x4
+ mov r4, r4, lsl #32-10
+ add r3, r3, r4, lsr #32-10-7
+ str r3, [sp, #19*4]
+#ifdef __ARM_ARCH_5E_OR_6_OR_7__
+ pld [r3, #16*4]
+ pld [r3]
+#endif
+ scrypt_core_macro3_x6
+ scrypt_core_macro3_x6
+
+ ldr r12, [sp, #18*4]
+ sub r0, r0, #32*4
+ ldr r1, [sp, #19*4]
+ subs r12, r12, #1
+ bne scrypt_core_loop2
+
+ scrypt_shuffle
+
+ ldr sp, [sp, #20*4]
+#ifdef __thumb__
+ ldmfd sp!, {r4-r11, lr}
+ bx lr
+#else
+ ldmfd sp!, {r4-r11, pc}
+#endif
+
+#endif
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