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Commit cf62a8b8 authored by Markos Chandras's avatar Markos Chandras Committed by Ralf Baechle
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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: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent bda4d986
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Showing with 143 additions and 110 deletions
arch/mips/lib/memcpy.S
View file @ cf62a8b8
...@@ -92,6 +92,10 @@ ...@@ -92,6 +92,10 @@
/* Pretech type */ /* Pretech type */
#define SRC_PREFETCH 1 #define SRC_PREFETCH 1
#define DST_PREFETCH 2 #define DST_PREFETCH 2
#define LEGACY_MODE 1
#define EVA_MODE 2
#define USEROP 1
#define KERNELOP 2
/* /*
* Wrapper to add an entry in the exception table * Wrapper to add an entry in the exception table
...@@ -103,12 +107,14 @@ ...@@ -103,12 +107,14 @@
* addr : Address * addr : Address
* handler : Exception handler * handler : Exception handler
*/ */
#define EXC(insn, type, reg, addr, handler) \
9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous
#define EXC(insn, type, reg, addr, handler) \
.if \mode == LEGACY_MODE; \
9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous; \
.endif
/* /*
* Only on the 64-bit kernel we can made use of 64-bit registers. * Only on the 64-bit kernel we can made use of 64-bit registers.
*/ */
...@@ -177,7 +183,10 @@ ...@@ -177,7 +183,10 @@
#define LOADB(reg, addr, handler) EXC(lb, LD_INSN, reg, addr, handler) #define LOADB(reg, addr, handler) EXC(lb, LD_INSN, reg, addr, handler)
#define STOREB(reg, addr, handler) EXC(sb, ST_INSN, reg, addr, handler) #define STOREB(reg, addr, handler) EXC(sb, ST_INSN, reg, addr, handler)
#define _PREF(hint, addr, type) PREF(hint, addr) #define _PREF(hint, addr, type) \
.if \mode == LEGACY_MODE; \
PREF(hint, addr); \
.endif
#define PREFS(hint, addr) _PREF(hint, addr, SRC_PREFETCH) #define PREFS(hint, addr) _PREF(hint, addr, SRC_PREFETCH)
#define PREFD(hint, addr) _PREF(hint, addr, DST_PREFETCH) #define PREFD(hint, addr) _PREF(hint, addr, DST_PREFETCH)
...@@ -210,27 +219,23 @@ ...@@ -210,27 +219,23 @@
.set at=v1 .set at=v1
#endif #endif
/*
* 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 .align 5
LEAF(memcpy) /* a0=dst a1=src a2=len */
move v0, dst /* return value */ /*
.L__memcpy: * Macro to build the __copy_user common code
FEXPORT(__copy_user) * Arguements:
li t6, 0 /* not inatomic */ * mode : LEGACY_MODE or EVA_MODE
__copy_user_common: * from : Source operand. USEROP or KERNELOP
* to : Destination operand. USEROP or KERNELOP
*/
.macro __BUILD_COPY_USER mode, from, to
/* initialize __memcpy if this the first time we execute this macro */
.ifnotdef __memcpy
.set __memcpy, 1
.hidden __memcpy /* make sure it does not leak */
.endif
/* /*
* Note: dst & src may be unaligned, len may be 0 * Note: dst & src may be unaligned, len may be 0
* Temps * Temps
...@@ -251,45 +256,45 @@ __copy_user_common: ...@@ -251,45 +256,45 @@ __copy_user_common:
and t1, dst, ADDRMASK and t1, dst, ADDRMASK
PREFS( 0, 1*32(src) ) PREFS( 0, 1*32(src) )
PREFD( 1, 1*32(dst) ) PREFD( 1, 1*32(dst) )
bnez t2, .Lcopy_bytes_checklen bnez t2, .Lcopy_bytes_checklen\@
and t0, src, ADDRMASK and t0, src, ADDRMASK
PREFS( 0, 2*32(src) ) PREFS( 0, 2*32(src) )
PREFD( 1, 2*32(dst) ) PREFD( 1, 2*32(dst) )
bnez t1, .Ldst_unaligned bnez t1, .Ldst_unaligned\@
nop nop
bnez t0, .Lsrc_unaligned_dst_aligned bnez t0, .Lsrc_unaligned_dst_aligned\@
/* /*
* use delay slot for fall-through * use delay slot for fall-through
* src and dst are aligned; need to compute rem * src and dst are aligned; need to compute rem
*/ */
.Lboth_aligned: .Lboth_aligned\@:
SRL t0, len, LOG_NBYTES+3 # +3 for 8 units/iter SRL t0, len, LOG_NBYTES+3 # +3 for 8 units/iter
beqz t0, .Lcleanup_both_aligned # len < 8*NBYTES beqz t0, .Lcleanup_both_aligned\@ # len < 8*NBYTES
and rem, len, (8*NBYTES-1) # rem = len % (8*NBYTES) and rem, len, (8*NBYTES-1) # rem = len % (8*NBYTES)
PREFS( 0, 3*32(src) ) PREFS( 0, 3*32(src) )
PREFD( 1, 3*32(dst) ) PREFD( 1, 3*32(dst) )
.align 4 .align 4
1: 1:
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
LOAD(t0, UNIT(0)(src), .Ll_exc) LOAD(t0, UNIT(0)(src), .Ll_exc\@)
LOAD(t1, UNIT(1)(src), .Ll_exc_copy) LOAD(t1, UNIT(1)(src), .Ll_exc_copy\@)
LOAD(t2, UNIT(2)(src), .Ll_exc_copy) LOAD(t2, UNIT(2)(src), .Ll_exc_copy\@)
LOAD(t3, UNIT(3)(src), .Ll_exc_copy) LOAD(t3, UNIT(3)(src), .Ll_exc_copy\@)
SUB len, len, 8*NBYTES SUB len, len, 8*NBYTES
LOAD(t4, UNIT(4)(src), .Ll_exc_copy) LOAD(t4, UNIT(4)(src), .Ll_exc_copy\@)
LOAD(t7, UNIT(5)(src), .Ll_exc_copy) LOAD(t7, UNIT(5)(src), .Ll_exc_copy\@)
STORE(t0, UNIT(0)(dst), .Ls_exc_p8u) STORE(t0, UNIT(0)(dst), .Ls_exc_p8u\@)
STORE(t1, UNIT(1)(dst), .Ls_exc_p7u) STORE(t1, UNIT(1)(dst), .Ls_exc_p7u\@)
LOAD(t0, UNIT(6)(src), .Ll_exc_copy) LOAD(t0, UNIT(6)(src), .Ll_exc_copy\@)
LOAD(t1, UNIT(7)(src), .Ll_exc_copy) LOAD(t1, UNIT(7)(src), .Ll_exc_copy\@)
ADD src, src, 8*NBYTES ADD src, src, 8*NBYTES
ADD dst, dst, 8*NBYTES ADD dst, dst, 8*NBYTES
STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u) STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u\@)
STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u) STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u\@)
STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u) STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u\@)
STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u) STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u\@)
STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u) STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u\@)
STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u) STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u\@)
PREFS( 0, 8*32(src) ) PREFS( 0, 8*32(src) )
PREFD( 1, 8*32(dst) ) PREFD( 1, 8*32(dst) )
bne len, rem, 1b bne len, rem, 1b
...@@ -298,41 +303,41 @@ __copy_user_common: ...@@ -298,41 +303,41 @@ __copy_user_common:
/* /*
* len == rem == the number of bytes left to copy < 8*NBYTES * len == rem == the number of bytes left to copy < 8*NBYTES
*/ */
.Lcleanup_both_aligned: .Lcleanup_both_aligned\@:
beqz len, .Ldone beqz len, .Ldone\@
sltu t0, len, 4*NBYTES sltu t0, len, 4*NBYTES
bnez t0, .Lless_than_4units bnez t0, .Lless_than_4units\@
and rem, len, (NBYTES-1) # rem = len % NBYTES and rem, len, (NBYTES-1) # rem = len % NBYTES
/* /*
* len >= 4*NBYTES * len >= 4*NBYTES
*/ */
LOAD( t0, UNIT(0)(src), .Ll_exc) LOAD( t0, UNIT(0)(src), .Ll_exc\@)
LOAD( t1, UNIT(1)(src), .Ll_exc_copy) LOAD( t1, UNIT(1)(src), .Ll_exc_copy\@)
LOAD( t2, UNIT(2)(src), .Ll_exc_copy) LOAD( t2, UNIT(2)(src), .Ll_exc_copy\@)
LOAD( t3, UNIT(3)(src), .Ll_exc_copy) LOAD( t3, UNIT(3)(src), .Ll_exc_copy\@)
SUB len, len, 4*NBYTES SUB len, len, 4*NBYTES
ADD src, src, 4*NBYTES ADD src, src, 4*NBYTES
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
STORE(t0, UNIT(0)(dst), .Ls_exc_p4u) STORE(t0, UNIT(0)(dst), .Ls_exc_p4u\@)
STORE(t1, UNIT(1)(dst), .Ls_exc_p3u) STORE(t1, UNIT(1)(dst), .Ls_exc_p3u\@)
STORE(t2, UNIT(2)(dst), .Ls_exc_p2u) STORE(t2, UNIT(2)(dst), .Ls_exc_p2u\@)
STORE(t3, UNIT(3)(dst), .Ls_exc_p1u) STORE(t3, UNIT(3)(dst), .Ls_exc_p1u\@)
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
ADD dst, dst, 4*NBYTES ADD dst, dst, 4*NBYTES
beqz len, .Ldone beqz len, .Ldone\@
.set noreorder .set noreorder
.Lless_than_4units: .Lless_than_4units\@:
/* /*
* rem = len % NBYTES * rem = len % NBYTES
*/ */
beq rem, len, .Lcopy_bytes beq rem, len, .Lcopy_bytes\@
nop nop
1: 1:
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
LOAD(t0, 0(src), .Ll_exc) LOAD(t0, 0(src), .Ll_exc\@)
ADD src, src, NBYTES ADD src, src, NBYTES
SUB len, len, NBYTES SUB len, len, NBYTES
STORE(t0, 0(dst), .Ls_exc_p1u) STORE(t0, 0(dst), .Ls_exc_p1u\@)
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
ADD dst, dst, NBYTES ADD dst, dst, NBYTES
bne rem, len, 1b bne rem, len, 1b
...@@ -350,17 +355,17 @@ __copy_user_common: ...@@ -350,17 +355,17 @@ __copy_user_common:
* more instruction-level parallelism. * more instruction-level parallelism.
*/ */
#define bits t2 #define bits t2
beqz len, .Ldone beqz len, .Ldone\@
ADD t1, dst, len # t1 is just past last byte of dst ADD t1, dst, len # t1 is just past last byte of dst
li bits, 8*NBYTES li bits, 8*NBYTES
SLL rem, len, 3 # rem = number of bits to keep SLL rem, len, 3 # rem = number of bits to keep
LOAD(t0, 0(src), .Ll_exc) LOAD(t0, 0(src), .Ll_exc\@)
SUB bits, bits, rem # bits = number of bits to discard SUB bits, bits, rem # bits = number of bits to discard
SHIFT_DISCARD t0, t0, bits SHIFT_DISCARD t0, t0, bits
STREST(t0, -1(t1), .Ls_exc) STREST(t0, -1(t1), .Ls_exc\@)
jr ra jr ra
move len, zero move len, zero
.Ldst_unaligned: .Ldst_unaligned\@:
/* /*
* dst is unaligned * dst is unaligned
* t0 = src & ADDRMASK * t0 = src & ADDRMASK
...@@ -371,23 +376,23 @@ __copy_user_common: ...@@ -371,23 +376,23 @@ __copy_user_common:
* Set match = (src and dst have same alignment) * Set match = (src and dst have same alignment)
*/ */
#define match rem #define match rem
LDFIRST(t3, FIRST(0)(src), .Ll_exc) LDFIRST(t3, FIRST(0)(src), .Ll_exc\@)
ADD t2, zero, NBYTES ADD t2, zero, NBYTES
LDREST(t3, REST(0)(src), .Ll_exc_copy) LDREST(t3, REST(0)(src), .Ll_exc_copy\@)
SUB t2, t2, t1 # t2 = number of bytes copied SUB t2, t2, t1 # t2 = number of bytes copied
xor match, t0, t1 xor match, t0, t1
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
STFIRST(t3, FIRST(0)(dst), .Ls_exc) STFIRST(t3, FIRST(0)(dst), .Ls_exc\@)
beq len, t2, .Ldone beq len, t2, .Ldone\@
SUB len, len, t2 SUB len, len, t2
ADD dst, dst, t2 ADD dst, dst, t2
beqz match, .Lboth_aligned beqz match, .Lboth_aligned\@
ADD src, src, t2 ADD src, src, t2
.Lsrc_unaligned_dst_aligned: .Lsrc_unaligned_dst_aligned\@:
SRL t0, len, LOG_NBYTES+2 # +2 for 4 units/iter SRL t0, len, LOG_NBYTES+2 # +2 for 4 units/iter
PREFS( 0, 3*32(src) ) PREFS( 0, 3*32(src) )
beqz t0, .Lcleanup_src_unaligned beqz t0, .Lcleanup_src_unaligned\@
and rem, len, (4*NBYTES-1) # rem = len % 4*NBYTES and rem, len, (4*NBYTES-1) # rem = len % 4*NBYTES
PREFD( 1, 3*32(dst) ) PREFD( 1, 3*32(dst) )
1: 1:
...@@ -398,58 +403,58 @@ __copy_user_common: ...@@ -398,58 +403,58 @@ __copy_user_common:
* are to the same unit (unless src is aligned, but it's not). * are to the same unit (unless src is aligned, but it's not).
*/ */
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
LDFIRST(t0, FIRST(0)(src), .Ll_exc) LDFIRST(t0, FIRST(0)(src), .Ll_exc\@)
LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy) LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy\@)
SUB len, len, 4*NBYTES SUB len, len, 4*NBYTES
LDREST(t0, REST(0)(src), .Ll_exc_copy) LDREST(t0, REST(0)(src), .Ll_exc_copy\@)
LDREST(t1, REST(1)(src), .Ll_exc_copy) LDREST(t1, REST(1)(src), .Ll_exc_copy\@)
LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy) LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy\@)
LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy) LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy\@)
LDREST(t2, REST(2)(src), .Ll_exc_copy) LDREST(t2, REST(2)(src), .Ll_exc_copy\@)
LDREST(t3, REST(3)(src), .Ll_exc_copy) LDREST(t3, REST(3)(src), .Ll_exc_copy\@)
PREFS( 0, 9*32(src) ) # 0 is PREF_LOAD (not streamed) PREFS( 0, 9*32(src) ) # 0 is PREF_LOAD (not streamed)
ADD src, src, 4*NBYTES ADD src, src, 4*NBYTES
#ifdef CONFIG_CPU_SB1 #ifdef CONFIG_CPU_SB1
nop # improves slotting nop # improves slotting
#endif #endif
STORE(t0, UNIT(0)(dst), .Ls_exc_p4u) STORE(t0, UNIT(0)(dst), .Ls_exc_p4u\@)
STORE(t1, UNIT(1)(dst), .Ls_exc_p3u) STORE(t1, UNIT(1)(dst), .Ls_exc_p3u\@)
STORE(t2, UNIT(2)(dst), .Ls_exc_p2u) STORE(t2, UNIT(2)(dst), .Ls_exc_p2u\@)
STORE(t3, UNIT(3)(dst), .Ls_exc_p1u) STORE(t3, UNIT(3)(dst), .Ls_exc_p1u\@)
PREFD( 1, 9*32(dst) ) # 1 is PREF_STORE (not streamed) PREFD( 1, 9*32(dst) ) # 1 is PREF_STORE (not streamed)
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
ADD dst, dst, 4*NBYTES ADD dst, dst, 4*NBYTES
bne len, rem, 1b bne len, rem, 1b
.set noreorder .set noreorder
.Lcleanup_src_unaligned: .Lcleanup_src_unaligned\@:
beqz len, .Ldone beqz len, .Ldone\@
and rem, len, NBYTES-1 # rem = len % NBYTES and rem, len, NBYTES-1 # rem = len % NBYTES
beq rem, len, .Lcopy_bytes beq rem, len, .Lcopy_bytes\@
nop nop
1: 1:
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
LDFIRST(t0, FIRST(0)(src), .Ll_exc) LDFIRST(t0, FIRST(0)(src), .Ll_exc\@)
LDREST(t0, REST(0)(src), .Ll_exc_copy) LDREST(t0, REST(0)(src), .Ll_exc_copy\@)
ADD src, src, NBYTES ADD src, src, NBYTES
SUB len, len, NBYTES SUB len, len, NBYTES
STORE(t0, 0(dst), .Ls_exc_p1u) STORE(t0, 0(dst), .Ls_exc_p1u\@)
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
ADD dst, dst, NBYTES ADD dst, dst, NBYTES
bne len, rem, 1b bne len, rem, 1b
.set noreorder .set noreorder
.Lcopy_bytes_checklen: .Lcopy_bytes_checklen\@:
beqz len, .Ldone beqz len, .Ldone\@
nop nop
.Lcopy_bytes: .Lcopy_bytes\@:
/* 0 < len < NBYTES */ /* 0 < len < NBYTES */
R10KCBARRIER(0(ra)) R10KCBARRIER(0(ra))
#define COPY_BYTE(N) \ #define COPY_BYTE(N) \
LOADB(t0, N(src), .Ll_exc); \ LOADB(t0, N(src), .Ll_exc\@); \
SUB len, len, 1; \ SUB len, len, 1; \
beqz len, .Ldone; \ beqz len, .Ldone\@; \
STOREB(t0, N(dst), .Ls_exc_p1) STOREB(t0, N(dst), .Ls_exc_p1\@)
COPY_BYTE(0) COPY_BYTE(0)
COPY_BYTE(1) COPY_BYTE(1)
...@@ -459,16 +464,19 @@ __copy_user_common: ...@@ -459,16 +464,19 @@ __copy_user_common:
COPY_BYTE(4) COPY_BYTE(4)
COPY_BYTE(5) COPY_BYTE(5)
#endif #endif
LOADB(t0, NBYTES-2(src), .Ll_exc) LOADB(t0, NBYTES-2(src), .Ll_exc\@)
SUB len, len, 1 SUB len, len, 1
jr ra jr ra
STOREB(t0, NBYTES-2(dst), .Ls_exc_p1) STOREB(t0, NBYTES-2(dst), .Ls_exc_p1\@)
.Ldone: .Ldone\@:
jr ra jr ra
nop .if __memcpy == 1
END(memcpy) END(memcpy)
.set __memcpy, 0
.hidden __memcpy
.endif
.Ll_exc_copy: .Ll_exc_copy\@:
/* /*
* Copy bytes from src until faulting load address (or until a * Copy bytes from src until faulting load address (or until a
* lb faults) * lb faults)
...@@ -483,20 +491,20 @@ __copy_user_common: ...@@ -483,20 +491,20 @@ __copy_user_common:
nop nop
LOADK t0, THREAD_BUADDR(t0) LOADK t0, THREAD_BUADDR(t0)
1: 1:
LOADB(t1, 0(src), .Ll_exc) LOADB(t1, 0(src), .Ll_exc\@)
ADD src, src, 1 ADD src, src, 1
sb t1, 0(dst) # can't fault -- we're copy_from_user sb t1, 0(dst) # can't fault -- we're copy_from_user
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
ADD dst, dst, 1 ADD dst, dst, 1
bne src, t0, 1b bne src, t0, 1b
.set noreorder .set noreorder
.Ll_exc: .Ll_exc\@:
LOADK t0, TI_TASK($28) LOADK t0, TI_TASK($28)
nop nop
LOADK t0, THREAD_BUADDR(t0) # t0 is just past last good address LOADK t0, THREAD_BUADDR(t0) # t0 is just past last good address
nop nop
SUB len, AT, t0 # len number of uncopied bytes 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, * Here's where we rely on src and dst being incremented in tandem,
* See (3) above. * See (3) above.
...@@ -510,7 +518,7 @@ __copy_user_common: ...@@ -510,7 +518,7 @@ __copy_user_common:
*/ */
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
SUB src, len, 1 SUB src, len, 1
beqz len, .Ldone beqz len, .Ldone\@
.set noreorder .set noreorder
1: sb zero, 0(dst) 1: sb zero, 0(dst)
ADD dst, dst, 1 ADD dst, dst, 1
...@@ -531,7 +539,7 @@ __copy_user_common: ...@@ -531,7 +539,7 @@ __copy_user_common:
#define SEXC(n) \ #define SEXC(n) \
.set reorder; /* DADDI_WAR */ \ .set reorder; /* DADDI_WAR */ \
.Ls_exc_p ## n ## u: \ .Ls_exc_p ## n ## u\@: \
ADD len, len, n*NBYTES; \ ADD len, len, n*NBYTES; \
jr ra; \ jr ra; \
.set noreorder .set noreorder
...@@ -545,14 +553,15 @@ SEXC(3) ...@@ -545,14 +553,15 @@ SEXC(3)
SEXC(2) SEXC(2)
SEXC(1) SEXC(1)
.Ls_exc_p1: .Ls_exc_p1\@:
.set reorder /* DADDI_WAR */ .set reorder /* DADDI_WAR */
ADD len, len, 1 ADD len, len, 1
jr ra jr ra
.set noreorder .set noreorder
.Ls_exc: .Ls_exc\@:
jr ra jr ra
nop nop
.endm
.align 5 .align 5
LEAF(memmove) LEAF(memmove)
...@@ -603,3 +612,27 @@ LEAF(__rmemcpy) /* a0=dst a1=src a2=len */ ...@@ -603,3 +612,27 @@ LEAF(__rmemcpy) /* a0=dst a1=src a2=len */
jr ra jr ra
move a2, zero move a2, zero
END(__rmemcpy) 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
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