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-rw-r--r--arch/mips/lib/memset.S325
1 files changed, 325 insertions, 0 deletions
diff --git a/arch/mips/lib/memset.S b/arch/mips/lib/memset.S
new file mode 100644
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+++ b/arch/mips/lib/memset.S
@@ -0,0 +1,325 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 1998, 1999, 2000 by Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2007 by Maciej W. Rozycki
+ * Copyright (C) 2011, 2012 MIPS Technologies, Inc.
+ */
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/export.h>
+#include <asm/regdef.h>
+
+#if LONGSIZE == 4
+#define LONG_S_L swl
+#define LONG_S_R swr
+#else
+#define LONG_S_L sdl
+#define LONG_S_R sdr
+#endif
+
+#ifdef CONFIG_CPU_MICROMIPS
+#define STORSIZE (LONGSIZE * 2)
+#define STORMASK (STORSIZE - 1)
+#define FILL64RG t8
+#define FILLPTRG t7
+#undef LONG_S
+#define LONG_S LONG_SP
+#else
+#define STORSIZE LONGSIZE
+#define STORMASK LONGMASK
+#define FILL64RG a1
+#define FILLPTRG t0
+#endif
+
+#define LEGACY_MODE 1
+#define EVA_MODE 2
+
+/*
+ * No need to protect it with EVA #ifdefery. The generated block of code
+ * will never be assembled if EVA is not enabled.
+ */
+#define __EVAFY(insn, reg, addr) __BUILD_EVA_INSN(insn##e, reg, addr)
+#define ___BUILD_EVA_INSN(insn, reg, addr) __EVAFY(insn, reg, addr)
+
+#define EX(insn,reg,addr,handler) \
+ .if \mode == LEGACY_MODE; \
+9: insn reg, addr; \
+ .else; \
+9: ___BUILD_EVA_INSN(insn, reg, addr); \
+ .endif; \
+ .section __ex_table,"a"; \
+ PTR_WD 9b, handler; \
+ .previous
+
+ .macro f_fill64 dst, offset, val, fixup, mode
+ EX(LONG_S, \val, (\offset + 0 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 1 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 2 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 3 * STORSIZE)(\dst), \fixup)
+#if ((defined(CONFIG_CPU_MICROMIPS) && (LONGSIZE == 4)) || !defined(CONFIG_CPU_MICROMIPS))
+ EX(LONG_S, \val, (\offset + 4 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 5 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 6 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 7 * STORSIZE)(\dst), \fixup)
+#endif
+#if (!defined(CONFIG_CPU_MICROMIPS) && (LONGSIZE == 4))
+ EX(LONG_S, \val, (\offset + 8 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 9 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 10 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 11 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 12 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 13 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 14 * STORSIZE)(\dst), \fixup)
+ EX(LONG_S, \val, (\offset + 15 * STORSIZE)(\dst), \fixup)
+#endif
+ .endm
+
+ .align 5
+
+ /*
+ * Macro to generate the __bzero{,_user} symbol
+ * Arguments:
+ * mode: LEGACY_MODE or EVA_MODE
+ */
+ .macro __BUILD_BZERO mode
+ /* Initialize __memset if this is the first time we call this macro */
+ .ifnotdef __memset
+ .set __memset, 1
+ .hidden __memset /* Make sure it does not leak */
+ .endif
+
+ sltiu t0, a2, STORSIZE /* very small region? */
+ .set noreorder
+ bnez t0, .Lsmall_memset\@
+ andi t0, a0, STORMASK /* aligned? */
+ .set reorder
+
+#ifdef CONFIG_CPU_MICROMIPS
+ move t8, a1 /* used by 'swp' instruction */
+ move t9, a1
+#endif
+ .set noreorder
+#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
+ beqz t0, 1f
+ PTR_SUBU t0, STORSIZE /* alignment in bytes */
+#else
+ .set noat
+ li AT, STORSIZE
+ beqz t0, 1f
+ PTR_SUBU t0, AT /* alignment in bytes */
+ .set at
+#endif
+ .set reorder
+
+#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
+ R10KCBARRIER(0(ra))
+#ifdef __MIPSEB__
+ EX(LONG_S_L, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */
+#else
+ EX(LONG_S_R, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */
+#endif
+ PTR_SUBU a0, t0 /* long align ptr */
+ PTR_ADDU a2, t0 /* correct size */
+
+#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
+#define STORE_BYTE(N) \
+ EX(sb, a1, N(a0), .Lbyte_fixup\@); \
+ .set noreorder; \
+ beqz t0, 0f; \
+ PTR_ADDU t0, 1; \
+ .set reorder;
+
+ PTR_ADDU a2, t0 /* correct size */
+ PTR_ADDU t0, 1
+ STORE_BYTE(0)
+ STORE_BYTE(1)
+#if LONGSIZE == 4
+ EX(sb, a1, 2(a0), .Lbyte_fixup\@)
+#else
+ STORE_BYTE(2)
+ STORE_BYTE(3)
+ STORE_BYTE(4)
+ STORE_BYTE(5)
+ EX(sb, a1, 6(a0), .Lbyte_fixup\@)
+#endif
+0:
+ ori a0, STORMASK
+ xori a0, STORMASK
+ PTR_ADDIU a0, STORSIZE
+#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
+1: ori t1, a2, 0x3f /* # of full blocks */
+ xori t1, 0x3f
+ andi t0, a2, 0x40-STORSIZE
+ beqz t1, .Lmemset_partial\@ /* no block to fill */
+
+ PTR_ADDU t1, a0 /* end address */
+1: PTR_ADDIU a0, 64
+ R10KCBARRIER(0(ra))
+ f_fill64 a0, -64, FILL64RG, .Lfwd_fixup\@, \mode
+ bne t1, a0, 1b
+
+.Lmemset_partial\@:
+ R10KCBARRIER(0(ra))
+ PTR_LA t1, 2f /* where to start */
+#ifdef CONFIG_CPU_MICROMIPS
+ LONG_SRL t7, t0, 1
+#endif
+#if LONGSIZE == 4
+ PTR_SUBU t1, FILLPTRG
+#else
+ .set noat
+ LONG_SRL AT, FILLPTRG, 1
+ PTR_SUBU t1, AT
+ .set at
+#endif
+ PTR_ADDU a0, t0 /* dest ptr */
+ jr t1
+
+ /* ... but first do longs ... */
+ f_fill64 a0, -64, FILL64RG, .Lpartial_fixup\@, \mode
+2: andi a2, STORMASK /* At most one long to go */
+
+ .set noreorder
+ beqz a2, 1f
+#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
+ PTR_ADDU a0, a2 /* What's left */
+ .set reorder
+ R10KCBARRIER(0(ra))
+#ifdef __MIPSEB__
+ EX(LONG_S_R, a1, -1(a0), .Llast_fixup\@)
+#else
+ EX(LONG_S_L, a1, -1(a0), .Llast_fixup\@)
+#endif
+#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
+ PTR_SUBU t0, $0, a2
+ .set reorder
+ move a2, zero /* No remaining longs */
+ PTR_ADDIU t0, 1
+ STORE_BYTE(0)
+ STORE_BYTE(1)
+#if LONGSIZE == 4
+ EX(sb, a1, 2(a0), .Lbyte_fixup\@)
+#else
+ STORE_BYTE(2)
+ STORE_BYTE(3)
+ STORE_BYTE(4)
+ STORE_BYTE(5)
+ EX(sb, a1, 6(a0), .Lbyte_fixup\@)
+#endif
+0:
+#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
+1: move a2, zero
+ jr ra
+
+.Lsmall_memset\@:
+ PTR_ADDU t1, a0, a2
+ beqz a2, 2f
+
+1: PTR_ADDIU a0, 1 /* fill bytewise */
+ R10KCBARRIER(0(ra))
+ .set noreorder
+ bne t1, a0, 1b
+ EX(sb, a1, -1(a0), .Lsmall_fixup\@)
+ .set reorder
+
+2: move a2, zero
+ jr ra /* done */
+ .if __memset == 1
+ END(memset)
+ .set __memset, 0
+ .hidden __memset
+ .endif
+
+#ifdef CONFIG_CPU_NO_LOAD_STORE_LR
+.Lbyte_fixup\@:
+ /*
+ * unset_bytes = (#bytes - (#unaligned bytes)) - (-#unaligned bytes remaining + 1) + 1
+ * a2 = a2 - t0 + 1
+ */
+ PTR_SUBU a2, t0
+ PTR_ADDIU a2, 1
+ jr ra
+#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
+
+.Lfirst_fixup\@:
+ /* unset_bytes already in a2 */
+ jr ra
+
+.Lfwd_fixup\@:
+ /*
+ * unset_bytes = partial_start_addr + #bytes - fault_addr
+ * a2 = t1 + (a2 & 3f) - $28->task->BUADDR
+ */
+ PTR_L t0, TI_TASK($28)
+ andi a2, 0x3f
+ LONG_L t0, THREAD_BUADDR(t0)
+ LONG_ADDU a2, t1
+ LONG_SUBU a2, t0
+ jr ra
+
+.Lpartial_fixup\@:
+ /*
+ * unset_bytes = partial_end_addr + #bytes - fault_addr
+ * a2 = a0 + (a2 & STORMASK) - $28->task->BUADDR
+ */
+ PTR_L t0, TI_TASK($28)
+ andi a2, STORMASK
+ LONG_L t0, THREAD_BUADDR(t0)
+ LONG_ADDU a2, a0
+ LONG_SUBU a2, t0
+ jr ra
+
+.Llast_fixup\@:
+ /* unset_bytes already in a2 */
+ jr ra
+
+.Lsmall_fixup\@:
+ /*
+ * unset_bytes = end_addr - current_addr + 1
+ * a2 = t1 - a0 + 1
+ */
+ PTR_SUBU a2, t1, a0
+ PTR_ADDIU a2, 1
+ jr ra
+
+ .endm
+
+/*
+ * memset(void *s, int c, size_t n)
+ *
+ * a0: start of area to clear
+ * a1: char to fill with
+ * a2: size of area to clear
+ */
+
+LEAF(memset)
+EXPORT_SYMBOL(memset)
+ move v0, a0 /* result */
+ beqz a1, 1f
+
+ andi a1, 0xff /* spread fillword */
+ LONG_SLL t1, a1, 8
+ or a1, t1
+ LONG_SLL t1, a1, 16
+#if LONGSIZE == 8
+ or a1, t1
+ LONG_SLL t1, a1, 32
+#endif
+ or a1, t1
+1:
+#ifndef CONFIG_EVA
+FEXPORT(__bzero)
+EXPORT_SYMBOL(__bzero)
+#endif
+ __BUILD_BZERO LEGACY_MODE
+
+#ifdef CONFIG_EVA
+LEAF(__bzero)
+EXPORT_SYMBOL(__bzero)
+ __BUILD_BZERO EVA_MODE
+END(__bzero)
+#endif
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