diff options
Diffstat (limited to 'libkern/memmove-68000.s')
| -rw-r--r-- | libkern/memmove-68000.s | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/libkern/memmove-68000.s b/libkern/memmove-68000.s deleted file mode 100644 index efb0853e..00000000 --- a/libkern/memmove-68000.s +++ /dev/null @@ -1,124 +0,0 @@ - TEXT memmove(SB), $0 - BRA move - - TEXT memcpy(SB), $0 -move: - - MOVL n+8(FP), R0 /* count */ - BEQ return - BGT ok - MOVL 0, R0 -ok: - MOVL s1+0(FP), A2 /* dest pointer */ - MOVL s2+4(FP), A1 /* source pointer */ - - CMPL A2,A1 - BHI back - -/* - * byte-at-a-time foreward copy to - * get source (A1) alligned. - */ -f1: - MOVL A1, R1 - ANDL $3, R1 - BEQ f2 - SUBL $1, R0 - BLT return - MOVB (A1)+, (A2)+ - BRA f1 - -/* - * check that dest is alligned - * if not, just go byte-at-a-time - */ -f2: - MOVL A2, R1 - ANDL $3, R1 - BEQ f3 - SUBL $1, R0 - BLT return - BRA f5 -/* - * quad-long-at-a-time forward copy - */ -f3: - SUBL $16, R0 - BLT f4 - MOVL (A1)+, (A2)+ - MOVL (A1)+, (A2)+ - MOVL (A1)+, (A2)+ - MOVL (A1)+, (A2)+ - BRA f3 - -/* - * cleanup byte-at-a-time - */ -f4: - ADDL $15, R0 - BLT return -f5: - MOVB (A1)+, (A2)+ - SUBL $1, R0 - BGE f5 - BRA return - -return: - MOVL s1+0(FP),R0 - RTS - -/* - * everything the same, but - * copy backwards - */ -back: - ADDL R0, A1 - ADDL R0, A2 - -/* - * byte-at-a-time backward copy to - * get source (A1) alligned. - */ -b1: - MOVL A1, R1 - ANDL $3, R1 - BEQ b2 - SUBL $1, R0 - BLT return - MOVB -(A1), -(A2) - BRA b1 - -/* - * check that dest is alligned - * if not, just go byte-at-a-time - */ -b2: - MOVL A2, R1 - ANDL $3, R1 - BEQ b3 - SUBL $1, R0 - BLT return - BRA b5 -/* - * quad-long-at-a-time backward copy - */ -b3: - SUBL $16, R0 - BLT b4 - MOVL -(A1), -(A2) - MOVL -(A1), -(A2) - MOVL -(A1), -(A2) - MOVL -(A1), -(A2) - BRA b3 - -/* - * cleanup byte-at-a-time backward - */ -b4: - ADDL $15, R0 - BLT return -b5: - MOVB -(A1), -(A2) - SUBL $1, R0 - BGE b5 - BRA return |