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MIPS: lib: memcpy: Use macro to build the copy_user code
The code can be shared between EVA and non-EVA configurations, therefore use a macro to build it to avoid code duplications. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras
Ralf Baechle
parent
bda4d986a6
commit
cf62a8b813
@ -92,6 +92,10 @@
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/* Pretech type */
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#define SRC_PREFETCH 1
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#define DST_PREFETCH 2
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#define LEGACY_MODE 1
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#define EVA_MODE 2
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#define USEROP 1
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#define KERNELOP 2
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/*
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* Wrapper to add an entry in the exception table
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@ -103,12 +107,14 @@
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* addr : Address
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* handler : Exception handler
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*/
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#define EXC(insn, type, reg, addr, handler) \
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9: insn reg, addr; \
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.section __ex_table,"a"; \
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PTR 9b, handler; \
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.previous
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#define EXC(insn, type, reg, addr, handler) \
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.if \mode == LEGACY_MODE; \
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9: insn reg, addr; \
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.section __ex_table,"a"; \
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PTR 9b, handler; \
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.previous; \
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.endif
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/*
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* Only on the 64-bit kernel we can made use of 64-bit registers.
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*/
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@ -177,7 +183,10 @@
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#define LOADB(reg, addr, handler) EXC(lb, LD_INSN, reg, addr, handler)
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#define STOREB(reg, addr, handler) EXC(sb, ST_INSN, reg, addr, handler)
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#define _PREF(hint, addr, type) PREF(hint, addr)
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#define _PREF(hint, addr, type) \
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.if \mode == LEGACY_MODE; \
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PREF(hint, addr); \
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.endif
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#define PREFS(hint, addr) _PREF(hint, addr, SRC_PREFETCH)
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#define PREFD(hint, addr) _PREF(hint, addr, DST_PREFETCH)
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@ -210,27 +219,23 @@
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.set at=v1
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#endif
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/*
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* t6 is used as a flag to note inatomic mode.
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*/
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LEAF(__copy_user_inatomic)
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b __copy_user_common
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li t6, 1
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END(__copy_user_inatomic)
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/*
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* A combined memcpy/__copy_user
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* __copy_user sets len to 0 for success; else to an upper bound of
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* the number of uncopied bytes.
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* memcpy sets v0 to dst.
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*/
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.align 5
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LEAF(memcpy) /* a0=dst a1=src a2=len */
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move v0, dst /* return value */
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.L__memcpy:
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FEXPORT(__copy_user)
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li t6, 0 /* not inatomic */
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__copy_user_common:
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/*
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* Macro to build the __copy_user common code
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* Arguements:
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* mode : LEGACY_MODE or EVA_MODE
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* from : Source operand. USEROP or KERNELOP
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* to : Destination operand. USEROP or KERNELOP
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*/
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.macro __BUILD_COPY_USER mode, from, to
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/* initialize __memcpy if this the first time we execute this macro */
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.ifnotdef __memcpy
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.set __memcpy, 1
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.hidden __memcpy /* make sure it does not leak */
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.endif
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/*
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* Note: dst & src may be unaligned, len may be 0
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* Temps
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@ -251,45 +256,45 @@ __copy_user_common:
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and t1, dst, ADDRMASK
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PREFS( 0, 1*32(src) )
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PREFD( 1, 1*32(dst) )
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bnez t2, .Lcopy_bytes_checklen
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bnez t2, .Lcopy_bytes_checklen\@
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and t0, src, ADDRMASK
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PREFS( 0, 2*32(src) )
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PREFD( 1, 2*32(dst) )
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bnez t1, .Ldst_unaligned
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bnez t1, .Ldst_unaligned\@
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nop
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bnez t0, .Lsrc_unaligned_dst_aligned
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bnez t0, .Lsrc_unaligned_dst_aligned\@
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/*
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* use delay slot for fall-through
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* src and dst are aligned; need to compute rem
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*/
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.Lboth_aligned:
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.Lboth_aligned\@:
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SRL t0, len, LOG_NBYTES+3 # +3 for 8 units/iter
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beqz t0, .Lcleanup_both_aligned # len < 8*NBYTES
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beqz t0, .Lcleanup_both_aligned\@ # len < 8*NBYTES
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and rem, len, (8*NBYTES-1) # rem = len % (8*NBYTES)
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PREFS( 0, 3*32(src) )
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PREFD( 1, 3*32(dst) )
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.align 4
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1:
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R10KCBARRIER(0(ra))
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LOAD(t0, UNIT(0)(src), .Ll_exc)
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LOAD(t1, UNIT(1)(src), .Ll_exc_copy)
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LOAD(t2, UNIT(2)(src), .Ll_exc_copy)
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LOAD(t3, UNIT(3)(src), .Ll_exc_copy)
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LOAD(t0, UNIT(0)(src), .Ll_exc\@)
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LOAD(t1, UNIT(1)(src), .Ll_exc_copy\@)
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LOAD(t2, UNIT(2)(src), .Ll_exc_copy\@)
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LOAD(t3, UNIT(3)(src), .Ll_exc_copy\@)
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SUB len, len, 8*NBYTES
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LOAD(t4, UNIT(4)(src), .Ll_exc_copy)
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LOAD(t7, UNIT(5)(src), .Ll_exc_copy)
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STORE(t0, UNIT(0)(dst), .Ls_exc_p8u)
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STORE(t1, UNIT(1)(dst), .Ls_exc_p7u)
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LOAD(t0, UNIT(6)(src), .Ll_exc_copy)
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LOAD(t1, UNIT(7)(src), .Ll_exc_copy)
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LOAD(t4, UNIT(4)(src), .Ll_exc_copy\@)
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LOAD(t7, UNIT(5)(src), .Ll_exc_copy\@)
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STORE(t0, UNIT(0)(dst), .Ls_exc_p8u\@)
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STORE(t1, UNIT(1)(dst), .Ls_exc_p7u\@)
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LOAD(t0, UNIT(6)(src), .Ll_exc_copy\@)
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LOAD(t1, UNIT(7)(src), .Ll_exc_copy\@)
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ADD src, src, 8*NBYTES
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ADD dst, dst, 8*NBYTES
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STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u)
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STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u)
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STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u)
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STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u)
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STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u)
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STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u)
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STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u\@)
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STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u\@)
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STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u\@)
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STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u\@)
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STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u\@)
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STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u\@)
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PREFS( 0, 8*32(src) )
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PREFD( 1, 8*32(dst) )
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bne len, rem, 1b
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@ -298,41 +303,41 @@ __copy_user_common:
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/*
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* len == rem == the number of bytes left to copy < 8*NBYTES
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*/
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.Lcleanup_both_aligned:
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beqz len, .Ldone
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.Lcleanup_both_aligned\@:
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beqz len, .Ldone\@
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sltu t0, len, 4*NBYTES
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bnez t0, .Lless_than_4units
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bnez t0, .Lless_than_4units\@
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and rem, len, (NBYTES-1) # rem = len % NBYTES
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/*
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* len >= 4*NBYTES
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*/
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LOAD( t0, UNIT(0)(src), .Ll_exc)
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LOAD( t1, UNIT(1)(src), .Ll_exc_copy)
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LOAD( t2, UNIT(2)(src), .Ll_exc_copy)
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LOAD( t3, UNIT(3)(src), .Ll_exc_copy)
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LOAD( t0, UNIT(0)(src), .Ll_exc\@)
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LOAD( t1, UNIT(1)(src), .Ll_exc_copy\@)
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LOAD( t2, UNIT(2)(src), .Ll_exc_copy\@)
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LOAD( t3, UNIT(3)(src), .Ll_exc_copy\@)
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SUB len, len, 4*NBYTES
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ADD src, src, 4*NBYTES
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R10KCBARRIER(0(ra))
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STORE(t0, UNIT(0)(dst), .Ls_exc_p4u)
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STORE(t1, UNIT(1)(dst), .Ls_exc_p3u)
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STORE(t2, UNIT(2)(dst), .Ls_exc_p2u)
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STORE(t3, UNIT(3)(dst), .Ls_exc_p1u)
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STORE(t0, UNIT(0)(dst), .Ls_exc_p4u\@)
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STORE(t1, UNIT(1)(dst), .Ls_exc_p3u\@)
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STORE(t2, UNIT(2)(dst), .Ls_exc_p2u\@)
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STORE(t3, UNIT(3)(dst), .Ls_exc_p1u\@)
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.set reorder /* DADDI_WAR */
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ADD dst, dst, 4*NBYTES
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beqz len, .Ldone
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beqz len, .Ldone\@
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.set noreorder
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.Lless_than_4units:
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.Lless_than_4units\@:
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/*
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* rem = len % NBYTES
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*/
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beq rem, len, .Lcopy_bytes
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beq rem, len, .Lcopy_bytes\@
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nop
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1:
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R10KCBARRIER(0(ra))
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LOAD(t0, 0(src), .Ll_exc)
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LOAD(t0, 0(src), .Ll_exc\@)
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ADD src, src, NBYTES
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SUB len, len, NBYTES
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STORE(t0, 0(dst), .Ls_exc_p1u)
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STORE(t0, 0(dst), .Ls_exc_p1u\@)
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.set reorder /* DADDI_WAR */
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ADD dst, dst, NBYTES
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bne rem, len, 1b
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@ -350,17 +355,17 @@ __copy_user_common:
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* more instruction-level parallelism.
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*/
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#define bits t2
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beqz len, .Ldone
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beqz len, .Ldone\@
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ADD t1, dst, len # t1 is just past last byte of dst
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li bits, 8*NBYTES
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SLL rem, len, 3 # rem = number of bits to keep
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LOAD(t0, 0(src), .Ll_exc)
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LOAD(t0, 0(src), .Ll_exc\@)
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SUB bits, bits, rem # bits = number of bits to discard
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SHIFT_DISCARD t0, t0, bits
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STREST(t0, -1(t1), .Ls_exc)
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STREST(t0, -1(t1), .Ls_exc\@)
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jr ra
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move len, zero
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.Ldst_unaligned:
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.Ldst_unaligned\@:
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/*
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* dst is unaligned
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* t0 = src & ADDRMASK
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@ -371,23 +376,23 @@ __copy_user_common:
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* Set match = (src and dst have same alignment)
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*/
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#define match rem
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LDFIRST(t3, FIRST(0)(src), .Ll_exc)
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LDFIRST(t3, FIRST(0)(src), .Ll_exc\@)
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ADD t2, zero, NBYTES
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LDREST(t3, REST(0)(src), .Ll_exc_copy)
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LDREST(t3, REST(0)(src), .Ll_exc_copy\@)
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SUB t2, t2, t1 # t2 = number of bytes copied
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xor match, t0, t1
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R10KCBARRIER(0(ra))
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STFIRST(t3, FIRST(0)(dst), .Ls_exc)
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beq len, t2, .Ldone
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STFIRST(t3, FIRST(0)(dst), .Ls_exc\@)
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beq len, t2, .Ldone\@
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SUB len, len, t2
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ADD dst, dst, t2
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beqz match, .Lboth_aligned
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beqz match, .Lboth_aligned\@
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ADD src, src, t2
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.Lsrc_unaligned_dst_aligned:
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.Lsrc_unaligned_dst_aligned\@:
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SRL t0, len, LOG_NBYTES+2 # +2 for 4 units/iter
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PREFS( 0, 3*32(src) )
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beqz t0, .Lcleanup_src_unaligned
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beqz t0, .Lcleanup_src_unaligned\@
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and rem, len, (4*NBYTES-1) # rem = len % 4*NBYTES
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PREFD( 1, 3*32(dst) )
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1:
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@ -398,58 +403,58 @@ __copy_user_common:
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* are to the same unit (unless src is aligned, but it's not).
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*/
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R10KCBARRIER(0(ra))
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LDFIRST(t0, FIRST(0)(src), .Ll_exc)
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LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy)
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LDFIRST(t0, FIRST(0)(src), .Ll_exc\@)
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LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy\@)
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SUB len, len, 4*NBYTES
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LDREST(t0, REST(0)(src), .Ll_exc_copy)
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LDREST(t1, REST(1)(src), .Ll_exc_copy)
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LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy)
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LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy)
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LDREST(t2, REST(2)(src), .Ll_exc_copy)
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LDREST(t3, REST(3)(src), .Ll_exc_copy)
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LDREST(t0, REST(0)(src), .Ll_exc_copy\@)
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LDREST(t1, REST(1)(src), .Ll_exc_copy\@)
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LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy\@)
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LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy\@)
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LDREST(t2, REST(2)(src), .Ll_exc_copy\@)
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LDREST(t3, REST(3)(src), .Ll_exc_copy\@)
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PREFS( 0, 9*32(src) ) # 0 is PREF_LOAD (not streamed)
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ADD src, src, 4*NBYTES
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#ifdef CONFIG_CPU_SB1
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nop # improves slotting
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#endif
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STORE(t0, UNIT(0)(dst), .Ls_exc_p4u)
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STORE(t1, UNIT(1)(dst), .Ls_exc_p3u)
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STORE(t2, UNIT(2)(dst), .Ls_exc_p2u)
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STORE(t3, UNIT(3)(dst), .Ls_exc_p1u)
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STORE(t0, UNIT(0)(dst), .Ls_exc_p4u\@)
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STORE(t1, UNIT(1)(dst), .Ls_exc_p3u\@)
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STORE(t2, UNIT(2)(dst), .Ls_exc_p2u\@)
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STORE(t3, UNIT(3)(dst), .Ls_exc_p1u\@)
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PREFD( 1, 9*32(dst) ) # 1 is PREF_STORE (not streamed)
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.set reorder /* DADDI_WAR */
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ADD dst, dst, 4*NBYTES
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bne len, rem, 1b
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.set noreorder
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.Lcleanup_src_unaligned:
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beqz len, .Ldone
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.Lcleanup_src_unaligned\@:
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beqz len, .Ldone\@
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and rem, len, NBYTES-1 # rem = len % NBYTES
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beq rem, len, .Lcopy_bytes
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beq rem, len, .Lcopy_bytes\@
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nop
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1:
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R10KCBARRIER(0(ra))
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LDFIRST(t0, FIRST(0)(src), .Ll_exc)
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LDREST(t0, REST(0)(src), .Ll_exc_copy)
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LDFIRST(t0, FIRST(0)(src), .Ll_exc\@)
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LDREST(t0, REST(0)(src), .Ll_exc_copy\@)
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ADD src, src, NBYTES
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SUB len, len, NBYTES
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STORE(t0, 0(dst), .Ls_exc_p1u)
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STORE(t0, 0(dst), .Ls_exc_p1u\@)
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.set reorder /* DADDI_WAR */
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ADD dst, dst, NBYTES
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bne len, rem, 1b
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.set noreorder
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.Lcopy_bytes_checklen:
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beqz len, .Ldone
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.Lcopy_bytes_checklen\@:
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beqz len, .Ldone\@
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nop
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.Lcopy_bytes:
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.Lcopy_bytes\@:
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/* 0 < len < NBYTES */
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R10KCBARRIER(0(ra))
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#define COPY_BYTE(N) \
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LOADB(t0, N(src), .Ll_exc); \
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LOADB(t0, N(src), .Ll_exc\@); \
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SUB len, len, 1; \
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beqz len, .Ldone; \
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STOREB(t0, N(dst), .Ls_exc_p1)
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beqz len, .Ldone\@; \
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STOREB(t0, N(dst), .Ls_exc_p1\@)
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COPY_BYTE(0)
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COPY_BYTE(1)
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@ -459,16 +464,19 @@ __copy_user_common:
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COPY_BYTE(4)
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COPY_BYTE(5)
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#endif
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LOADB(t0, NBYTES-2(src), .Ll_exc)
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LOADB(t0, NBYTES-2(src), .Ll_exc\@)
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SUB len, len, 1
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jr ra
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STOREB(t0, NBYTES-2(dst), .Ls_exc_p1)
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.Ldone:
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STOREB(t0, NBYTES-2(dst), .Ls_exc_p1\@)
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.Ldone\@:
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jr ra
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nop
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.if __memcpy == 1
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END(memcpy)
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.set __memcpy, 0
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.hidden __memcpy
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.endif
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.Ll_exc_copy:
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.Ll_exc_copy\@:
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/*
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* Copy bytes from src until faulting load address (or until a
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* lb faults)
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@ -483,20 +491,20 @@ __copy_user_common:
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nop
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LOADK t0, THREAD_BUADDR(t0)
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1:
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LOADB(t1, 0(src), .Ll_exc)
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LOADB(t1, 0(src), .Ll_exc\@)
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ADD src, src, 1
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sb t1, 0(dst) # can't fault -- we're copy_from_user
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.set reorder /* DADDI_WAR */
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ADD dst, dst, 1
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bne src, t0, 1b
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.set noreorder
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.Ll_exc:
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.Ll_exc\@:
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LOADK t0, TI_TASK($28)
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||||
nop
|
||||
LOADK t0, THREAD_BUADDR(t0) # t0 is just past last good address
|
||||
nop
|
||||
SUB len, AT, t0 # len number of uncopied bytes
|
||||
bnez t6, .Ldone /* Skip the zeroing part if inatomic */
|
||||
bnez t6, .Ldone\@ /* Skip the zeroing part if inatomic */
|
||||
/*
|
||||
* Here's where we rely on src and dst being incremented in tandem,
|
||||
* See (3) above.
|
||||
@ -510,7 +518,7 @@ __copy_user_common:
|
||||
*/
|
||||
.set reorder /* DADDI_WAR */
|
||||
SUB src, len, 1
|
||||
beqz len, .Ldone
|
||||
beqz len, .Ldone\@
|
||||
.set noreorder
|
||||
1: sb zero, 0(dst)
|
||||
ADD dst, dst, 1
|
||||
@ -531,7 +539,7 @@ __copy_user_common:
|
||||
|
||||
#define SEXC(n) \
|
||||
.set reorder; /* DADDI_WAR */ \
|
||||
.Ls_exc_p ## n ## u: \
|
||||
.Ls_exc_p ## n ## u\@: \
|
||||
ADD len, len, n*NBYTES; \
|
||||
jr ra; \
|
||||
.set noreorder
|
||||
@ -545,14 +553,15 @@ SEXC(3)
|
||||
SEXC(2)
|
||||
SEXC(1)
|
||||
|
||||
.Ls_exc_p1:
|
||||
.Ls_exc_p1\@:
|
||||
.set reorder /* DADDI_WAR */
|
||||
ADD len, len, 1
|
||||
jr ra
|
||||
.set noreorder
|
||||
.Ls_exc:
|
||||
.Ls_exc\@:
|
||||
jr ra
|
||||
nop
|
||||
.endm
|
||||
|
||||
.align 5
|
||||
LEAF(memmove)
|
||||
@ -603,3 +612,27 @@ LEAF(__rmemcpy) /* a0=dst a1=src a2=len */
|
||||
jr ra
|
||||
move a2, zero
|
||||
END(__rmemcpy)
|
||||
|
||||
/*
|
||||
* t6 is used as a flag to note inatomic mode.
|
||||
*/
|
||||
LEAF(__copy_user_inatomic)
|
||||
b __copy_user_common
|
||||
li t6, 1
|
||||
END(__copy_user_inatomic)
|
||||
|
||||
/*
|
||||
* A combined memcpy/__copy_user
|
||||
* __copy_user sets len to 0 for success; else to an upper bound of
|
||||
* the number of uncopied bytes.
|
||||
* memcpy sets v0 to dst.
|
||||
*/
|
||||
.align 5
|
||||
LEAF(memcpy) /* a0=dst a1=src a2=len */
|
||||
move v0, dst /* return value */
|
||||
.L__memcpy:
|
||||
FEXPORT(__copy_user)
|
||||
li t6, 0 /* not inatomic */
|
||||
__copy_user_common:
|
||||
/* Legacy Mode, user <-> user */
|
||||
__BUILD_COPY_USER LEGACY_MODE USEROP USEROP
|
||||
|
||||
Loading…
Reference in New Issue
Block a user