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MIPS: lib: memset: Use macro to build the __bzero symbol
Build the __bzero symbol using a macor. In EVA mode we will need to use similar code to do the userspace load operations so it is better if we use a macro to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras
Ralf Baechle
parent
8483b14aaa
commit
6d5155c2a6
@ -34,6 +34,9 @@
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#define FILLPTRG t0
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#endif
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#define LEGACY_MODE 1
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#define EVA_MODE 2
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#define EX(insn,reg,addr,handler) \
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9: insn reg, addr; \
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.section __ex_table,"a"; \
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@ -63,33 +66,23 @@
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#endif
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.endm
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/*
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* memset(void *s, int c, size_t n)
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*
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* a0: start of area to clear
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* a1: char to fill with
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* a2: size of area to clear
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*/
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.set noreorder
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.align 5
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LEAF(memset)
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beqz a1, 1f
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move v0, a0 /* result */
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andi a1, 0xff /* spread fillword */
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LONG_SLL t1, a1, 8
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or a1, t1
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LONG_SLL t1, a1, 16
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#if LONGSIZE == 8
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or a1, t1
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LONG_SLL t1, a1, 32
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#endif
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or a1, t1
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1:
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/*
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* Macro to generate the __bzero{,_user} symbol
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* Arguments:
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* mode: LEGACY_MODE or EVA_MODE
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*/
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.macro __BUILD_BZERO mode
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/* Initialize __memset if this is the first time we call this macro */
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.ifnotdef __memset
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.set __memset, 1
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.hidden __memset /* Make sure it does not leak */
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.endif
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FEXPORT(__bzero)
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sltiu t0, a2, STORSIZE /* very small region? */
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bnez t0, .Lsmall_memset
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bnez t0, .Lsmall_memset\@
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andi t0, a0, STORMASK /* aligned? */
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#ifdef CONFIG_CPU_MICROMIPS
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@ -109,28 +102,28 @@ FEXPORT(__bzero)
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R10KCBARRIER(0(ra))
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#ifdef __MIPSEB__
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EX(LONG_S_L, a1, (a0), .Lfirst_fixup) /* make word/dword aligned */
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EX(LONG_S_L, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */
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#endif
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#ifdef __MIPSEL__
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EX(LONG_S_R, a1, (a0), .Lfirst_fixup) /* make word/dword aligned */
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EX(LONG_S_R, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */
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#endif
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PTR_SUBU a0, t0 /* long align ptr */
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PTR_ADDU a2, t0 /* correct size */
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1: ori t1, a2, 0x3f /* # of full blocks */
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xori t1, 0x3f
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beqz t1, .Lmemset_partial /* no block to fill */
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beqz t1, .Lmemset_partial\@ /* no block to fill */
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andi t0, a2, 0x40-STORSIZE
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PTR_ADDU t1, a0 /* end address */
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.set reorder
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1: PTR_ADDIU a0, 64
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R10KCBARRIER(0(ra))
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f_fill64 a0, -64, FILL64RG, .Lfwd_fixup
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f_fill64 a0, -64, FILL64RG, .Lfwd_fixup\@
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bne t1, a0, 1b
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.set noreorder
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.Lmemset_partial:
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.Lmemset_partial\@:
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R10KCBARRIER(0(ra))
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PTR_LA t1, 2f /* where to start */
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#ifdef CONFIG_CPU_MICROMIPS
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@ -150,7 +143,8 @@ FEXPORT(__bzero)
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.set push
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.set noreorder
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.set nomacro
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f_fill64 a0, -64, FILL64RG, .Lpartial_fixup /* ... but first do longs ... */
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/* ... but first do longs ... */
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f_fill64 a0, -64, FILL64RG, .Lpartial_fixup\@
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2: .set pop
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andi a2, STORMASK /* At most one long to go */
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@ -158,15 +152,15 @@ FEXPORT(__bzero)
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PTR_ADDU a0, a2 /* What's left */
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R10KCBARRIER(0(ra))
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#ifdef __MIPSEB__
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EX(LONG_S_R, a1, -1(a0), .Llast_fixup)
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EX(LONG_S_R, a1, -1(a0), .Llast_fixup\@)
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#endif
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#ifdef __MIPSEL__
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EX(LONG_S_L, a1, -1(a0), .Llast_fixup)
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EX(LONG_S_L, a1, -1(a0), .Llast_fixup\@)
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#endif
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1: jr ra
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move a2, zero
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.Lsmall_memset:
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.Lsmall_memset\@:
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beqz a2, 2f
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PTR_ADDU t1, a0, a2
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@ -177,13 +171,17 @@ FEXPORT(__bzero)
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2: jr ra /* done */
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move a2, zero
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.if __memset == 1
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END(memset)
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.set __memset, 0
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.hidden __memset
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.endif
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.Lfirst_fixup:
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.Lfirst_fixup\@:
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jr ra
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nop
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.Lfwd_fixup:
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.Lfwd_fixup\@:
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PTR_L t0, TI_TASK($28)
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andi a2, 0x3f
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LONG_L t0, THREAD_BUADDR(t0)
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@ -191,7 +189,7 @@ FEXPORT(__bzero)
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jr ra
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LONG_SUBU a2, t0
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.Lpartial_fixup:
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.Lpartial_fixup\@:
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PTR_L t0, TI_TASK($28)
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andi a2, STORMASK
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LONG_L t0, THREAD_BUADDR(t0)
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@ -199,6 +197,33 @@ FEXPORT(__bzero)
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jr ra
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LONG_SUBU a2, t0
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.Llast_fixup:
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.Llast_fixup\@:
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jr ra
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andi v1, a2, STORMASK
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.endm
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/*
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* memset(void *s, int c, size_t n)
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*
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* a0: start of area to clear
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* a1: char to fill with
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* a2: size of area to clear
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*/
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LEAF(memset)
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beqz a1, 1f
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move v0, a0 /* result */
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andi a1, 0xff /* spread fillword */
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LONG_SLL t1, a1, 8
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or a1, t1
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LONG_SLL t1, a1, 16
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#if LONGSIZE == 8
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or a1, t1
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LONG_SLL t1, a1, 32
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#endif
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or a1, t1
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1:
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FEXPORT(__bzero)
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__BUILD_BZERO LEGACY_MODE
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