--- /dev/null
+/*
+ * SHA-1 implementation for PowerPC.
+ *
+ * Copyright (C) 2005 Paul Mackerras <paulus@samba.org>
+ */
+#define FS 80
+
+/*
+ * We roll the registers for T, A, B, C, D, E around on each
+ * iteration; T on iteration t is A on iteration t+1, and so on.
+ * We use registers 7 - 12 for this.
+ */
+#define RT(t) ((((t)+5)%6)+7)
+#define RA(t) ((((t)+4)%6)+7)
+#define RB(t) ((((t)+3)%6)+7)
+#define RC(t) ((((t)+2)%6)+7)
+#define RD(t) ((((t)+1)%6)+7)
+#define RE(t) ((((t)+0)%6)+7)
+
+/* We use registers 16 - 31 for the W values */
+#define W(t) (((t)%16)+16)
+
+#define STEPD0(t) \
+ and %r6,RB(t),RC(t); \
+ andc %r0,RD(t),RB(t); \
+ rotlwi RT(t),RA(t),5; \
+ rotlwi RB(t),RB(t),30; \
+ or %r6,%r6,%r0; \
+ add %r0,RE(t),%r15; \
+ add RT(t),RT(t),%r6; \
+ add %r0,%r0,W(t); \
+ add RT(t),RT(t),%r0
+
+#define STEPD1(t) \
+ xor %r6,RB(t),RC(t); \
+ rotlwi RT(t),RA(t),5; \
+ rotlwi RB(t),RB(t),30; \
+ xor %r6,%r6,RD(t); \
+ add %r0,RE(t),%r15; \
+ add RT(t),RT(t),%r6; \
+ add %r0,%r0,W(t); \
+ add RT(t),RT(t),%r0
+
+#define STEPD2(t) \
+ and %r6,RB(t),RC(t); \
+ and %r0,RB(t),RD(t); \
+ rotlwi RT(t),RA(t),5; \
+ rotlwi RB(t),RB(t),30; \
+ or %r6,%r6,%r0; \
+ and %r0,RC(t),RD(t); \
+ or %r6,%r6,%r0; \
+ add %r0,RE(t),%r15; \
+ add RT(t),RT(t),%r6; \
+ add %r0,%r0,W(t); \
+ add RT(t),RT(t),%r0
+
+#define LOADW(t) \
+ lwz W(t),(t)*4(%r4)
+
+#define UPDATEW(t) \
+ xor %r0,W((t)-3),W((t)-8); \
+ xor W(t),W((t)-16),W((t)-14); \
+ xor W(t),W(t),%r0; \
+ rotlwi W(t),W(t),1
+
+#define STEP0LD4(t) \
+ STEPD0(t); LOADW((t)+4); \
+ STEPD0((t)+1); LOADW((t)+5); \
+ STEPD0((t)+2); LOADW((t)+6); \
+ STEPD0((t)+3); LOADW((t)+7)
+
+#define STEPUP4(t, fn) \
+ STEP##fn(t); UPDATEW((t)+4); \
+ STEP##fn((t)+1); UPDATEW((t)+5); \
+ STEP##fn((t)+2); UPDATEW((t)+6); \
+ STEP##fn((t)+3); UPDATEW((t)+7)
+
+#define STEPUP20(t, fn) \
+ STEPUP4(t, fn); \
+ STEPUP4((t)+4, fn); \
+ STEPUP4((t)+8, fn); \
+ STEPUP4((t)+12, fn); \
+ STEPUP4((t)+16, fn)
+
+ .globl sha1_core
+sha1_core:
+ stwu %r1,-FS(%r1)
+ stw %r15,FS-68(%r1)
+ stw %r16,FS-64(%r1)
+ stw %r17,FS-60(%r1)
+ stw %r18,FS-56(%r1)
+ stw %r19,FS-52(%r1)
+ stw %r20,FS-48(%r1)
+ stw %r21,FS-44(%r1)
+ stw %r22,FS-40(%r1)
+ stw %r23,FS-36(%r1)
+ stw %r24,FS-32(%r1)
+ stw %r25,FS-28(%r1)
+ stw %r26,FS-24(%r1)
+ stw %r27,FS-20(%r1)
+ stw %r28,FS-16(%r1)
+ stw %r29,FS-12(%r1)
+ stw %r30,FS-8(%r1)
+ stw %r31,FS-4(%r1)
+
+ /* Load up A - E */
+ lwz RA(0),0(%r3) /* A */
+ lwz RB(0),4(%r3) /* B */
+ lwz RC(0),8(%r3) /* C */
+ lwz RD(0),12(%r3) /* D */
+ lwz RE(0),16(%r3) /* E */
+
+ mtctr %r5
+
+1: LOADW(0)
+ LOADW(1)
+ LOADW(2)
+ LOADW(3)
+
+ lis %r15,0x5a82 /* K0-19 */
+ ori %r15,%r15,0x7999
+ STEP0LD4(0)
+ STEP0LD4(4)
+ STEP0LD4(8)
+ STEPUP4(12, D0)
+ STEPUP4(16, D0)
+
+ lis %r15,0x6ed9 /* K20-39 */
+ ori %r15,%r15,0xeba1
+ STEPUP20(20, D1)
+
+ lis %r15,0x8f1b /* K40-59 */
+ ori %r15,%r15,0xbcdc
+ STEPUP20(40, D2)
+
+ lis %r15,0xca62 /* K60-79 */
+ ori %r15,%r15,0xc1d6
+ STEPUP4(60, D1)
+ STEPUP4(64, D1)
+ STEPUP4(68, D1)
+ STEPUP4(72, D1)
+ STEPD1(76)
+ STEPD1(77)
+ STEPD1(78)
+ STEPD1(79)
+
+ lwz %r20,16(%r3)
+ lwz %r19,12(%r3)
+ lwz %r18,8(%r3)
+ lwz %r17,4(%r3)
+ lwz %r16,0(%r3)
+ add %r20,RE(80),%r20
+ add RD(0),RD(80),%r19
+ add RC(0),RC(80),%r18
+ add RB(0),RB(80),%r17
+ add RA(0),RA(80),%r16
+ mr RE(0),%r20
+ stw RA(0),0(%r3)
+ stw RB(0),4(%r3)
+ stw RC(0),8(%r3)
+ stw RD(0),12(%r3)
+ stw RE(0),16(%r3)
+
+ addi %r4,%r4,64
+ bdnz 1b
+
+ lwz %r15,FS-68(%r1)
+ lwz %r16,FS-64(%r1)
+ lwz %r17,FS-60(%r1)
+ lwz %r18,FS-56(%r1)
+ lwz %r19,FS-52(%r1)
+ lwz %r20,FS-48(%r1)
+ lwz %r21,FS-44(%r1)
+ lwz %r22,FS-40(%r1)
+ lwz %r23,FS-36(%r1)
+ lwz %r24,FS-32(%r1)
+ lwz %r25,FS-28(%r1)
+ lwz %r26,FS-24(%r1)
+ lwz %r27,FS-20(%r1)
+ lwz %r28,FS-16(%r1)
+ lwz %r29,FS-12(%r1)
+ lwz %r30,FS-8(%r1)
+ lwz %r31,FS-4(%r1)
+ addi %r1,%r1,FS
+ blr
projects / git.git / blobdiff