diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/xtensa/lib/strncpy_user.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/xtensa/lib/strncpy_user.S | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/ANDROID_3.4.5/arch/xtensa/lib/strncpy_user.S b/ANDROID_3.4.5/arch/xtensa/lib/strncpy_user.S deleted file mode 100644 index 9f603cda..00000000 --- a/ANDROID_3.4.5/arch/xtensa/lib/strncpy_user.S +++ /dev/null @@ -1,225 +0,0 @@ -/* - * arch/xtensa/lib/strncpy_user.S - * - * This file is subject to the terms and conditions of the GNU General - * Public License. See the file "COPYING" in the main directory of - * this archive for more details. - * - * Returns: -EFAULT if exception before terminator, N if the entire - * buffer filled, else strlen. - * - * Copyright (C) 2002 Tensilica Inc. - */ - -#include <variant/core.h> -#include <linux/errno.h> - -/* Load or store instructions that may cause exceptions use the EX macro. */ - -#define EX(insn,reg1,reg2,offset,handler) \ -9: insn reg1, reg2, offset; \ - .section __ex_table, "a"; \ - .word 9b, handler; \ - .previous - -/* - * char *__strncpy_user(char *dst, const char *src, size_t len) - */ - -#ifdef __XTENSA_EB__ -# define MASK0 0xff000000 -# define MASK1 0x00ff0000 -# define MASK2 0x0000ff00 -# define MASK3 0x000000ff -#else -# define MASK0 0x000000ff -# define MASK1 0x0000ff00 -# define MASK2 0x00ff0000 -# define MASK3 0xff000000 -#endif - -# Register use -# a0/ return address -# a1/ stack pointer -# a2/ return value -# a3/ src -# a4/ len -# a5/ mask0 -# a6/ mask1 -# a7/ mask2 -# a8/ mask3 -# a9/ tmp -# a10/ tmp -# a11/ dst -# a12/ tmp - -.text -.align 4 -.global __strncpy_user -.type __strncpy_user,@function -__strncpy_user: - entry sp, 16 # minimal stack frame - # a2/ dst, a3/ src, a4/ len - mov a11, a2 # leave dst in return value register - beqz a4, .Lret # if len is zero - movi a5, MASK0 # mask for byte 0 - movi a6, MASK1 # mask for byte 1 - movi a7, MASK2 # mask for byte 2 - movi a8, MASK3 # mask for byte 3 - bbsi.l a3, 0, .Lsrc1mod2 # if only 8-bit aligned - bbsi.l a3, 1, .Lsrc2mod4 # if only 16-bit aligned -.Lsrcaligned: # return here when src is word-aligned - srli a12, a4, 2 # number of loop iterations with 4B per loop - movi a9, 3 - bnone a11, a9, .Laligned - j .Ldstunaligned - -.Lsrc1mod2: # src address is odd - EX(l8ui, a9, a3, 0, fixup_l) # get byte 0 - addi a3, a3, 1 # advance src pointer - EX(s8i, a9, a11, 0, fixup_s) # store byte 0 - beqz a9, .Lret # if byte 0 is zero - addi a11, a11, 1 # advance dst pointer - addi a4, a4, -1 # decrement len - beqz a4, .Lret # if len is zero - bbci.l a3, 1, .Lsrcaligned # if src is now word-aligned - -.Lsrc2mod4: # src address is 2 mod 4 - EX(l8ui, a9, a3, 0, fixup_l) # get byte 0 - /* 1-cycle interlock */ - EX(s8i, a9, a11, 0, fixup_s) # store byte 0 - beqz a9, .Lret # if byte 0 is zero - addi a11, a11, 1 # advance dst pointer - addi a4, a4, -1 # decrement len - beqz a4, .Lret # if len is zero - EX(l8ui, a9, a3, 1, fixup_l) # get byte 0 - addi a3, a3, 2 # advance src pointer - EX(s8i, a9, a11, 0, fixup_s) # store byte 0 - beqz a9, .Lret # if byte 0 is zero - addi a11, a11, 1 # advance dst pointer - addi a4, a4, -1 # decrement len - bnez a4, .Lsrcaligned # if len is nonzero -.Lret: - sub a2, a11, a2 # compute strlen - retw - -/* - * dst is word-aligned, src is word-aligned - */ - .align 4 # 1 mod 4 alignment for LOOPNEZ - .byte 0 # (0 mod 4 alignment for LBEG) -.Laligned: -#if XCHAL_HAVE_LOOPS - loopnez a12, .Loop1done -#else - beqz a12, .Loop1done - slli a12, a12, 2 - add a12, a12, a11 # a12 = end of last 4B chunck -#endif -.Loop1: - EX(l32i, a9, a3, 0, fixup_l) # get word from src - addi a3, a3, 4 # advance src pointer - bnone a9, a5, .Lz0 # if byte 0 is zero - bnone a9, a6, .Lz1 # if byte 1 is zero - bnone a9, a7, .Lz2 # if byte 2 is zero - EX(s32i, a9, a11, 0, fixup_s) # store word to dst - bnone a9, a8, .Lz3 # if byte 3 is zero - addi a11, a11, 4 # advance dst pointer -#if !XCHAL_HAVE_LOOPS - blt a11, a12, .Loop1 -#endif - -.Loop1done: - bbci.l a4, 1, .L100 - # copy 2 bytes - EX(l16ui, a9, a3, 0, fixup_l) - addi a3, a3, 2 # advance src pointer -#ifdef __XTENSA_EB__ - bnone a9, a7, .Lz0 # if byte 2 is zero - bnone a9, a8, .Lz1 # if byte 3 is zero -#else - bnone a9, a5, .Lz0 # if byte 0 is zero - bnone a9, a6, .Lz1 # if byte 1 is zero -#endif - EX(s16i, a9, a11, 0, fixup_s) - addi a11, a11, 2 # advance dst pointer -.L100: - bbci.l a4, 0, .Lret - EX(l8ui, a9, a3, 0, fixup_l) - /* slot */ - EX(s8i, a9, a11, 0, fixup_s) - beqz a9, .Lret # if byte is zero - addi a11, a11, 1-3 # advance dst ptr 1, but also cancel - # the effect of adding 3 in .Lz3 code - /* fall thru to .Lz3 and "retw" */ - -.Lz3: # byte 3 is zero - addi a11, a11, 3 # advance dst pointer - sub a2, a11, a2 # compute strlen - retw -.Lz0: # byte 0 is zero -#ifdef __XTENSA_EB__ - movi a9, 0 -#endif /* __XTENSA_EB__ */ - EX(s8i, a9, a11, 0, fixup_s) - sub a2, a11, a2 # compute strlen - retw -.Lz1: # byte 1 is zero -#ifdef __XTENSA_EB__ - extui a9, a9, 16, 16 -#endif /* __XTENSA_EB__ */ - EX(s16i, a9, a11, 0, fixup_s) - addi a11, a11, 1 # advance dst pointer - sub a2, a11, a2 # compute strlen - retw -.Lz2: # byte 2 is zero -#ifdef __XTENSA_EB__ - extui a9, a9, 16, 16 -#endif /* __XTENSA_EB__ */ - EX(s16i, a9, a11, 0, fixup_s) - movi a9, 0 - EX(s8i, a9, a11, 2, fixup_s) - addi a11, a11, 2 # advance dst pointer - sub a2, a11, a2 # compute strlen - retw - - .align 4 # 1 mod 4 alignment for LOOPNEZ - .byte 0 # (0 mod 4 alignment for LBEG) -.Ldstunaligned: -/* - * for now just use byte copy loop - */ -#if XCHAL_HAVE_LOOPS - loopnez a4, .Lunalignedend -#else - beqz a4, .Lunalignedend - add a12, a11, a4 # a12 = ending address -#endif /* XCHAL_HAVE_LOOPS */ -.Lnextbyte: - EX(l8ui, a9, a3, 0, fixup_l) - addi a3, a3, 1 - EX(s8i, a9, a11, 0, fixup_s) - beqz a9, .Lunalignedend - addi a11, a11, 1 -#if !XCHAL_HAVE_LOOPS - blt a11, a12, .Lnextbyte -#endif - -.Lunalignedend: - sub a2, a11, a2 # compute strlen - retw - - - .section .fixup, "ax" - .align 4 - - /* For now, just return -EFAULT. Future implementations might - * like to clear remaining kernel space, like the fixup - * implementation in memset(). Thus, we differentiate between - * load/store fixups. */ - -fixup_s: -fixup_l: - movi a2, -EFAULT - retw - |