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-rw-r--r--arch/mips/lib/memcpy.S158
1 files changed, 89 insertions, 69 deletions
diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S
index c5c40dad0bbf..ab9f04641640 100644
--- a/arch/mips/lib/memcpy.S
+++ b/arch/mips/lib/memcpy.S
@@ -10,6 +10,7 @@
* Copyright (C) 2002 Broadcom, Inc.
* memcpy/copy_user author: Mark Vandevoorde
* Copyright (C) 2007 Maciej W. Rozycki
+ * Copyright (C) 2014 Imagination Technologies Ltd.
*
* Mnemonic names for arguments to memcpy/__copy_user
*/
@@ -85,8 +86,22 @@
* they're not protected.
*/
-#define EXC(inst_reg,addr,handler) \
-9: inst_reg, addr; \
+/* Instruction type */
+#define LD_INSN 1
+#define ST_INSN 2
+
+/*
+ * Wrapper to add an entry in the exception table
+ * in case the insn causes a memory exception.
+ * Arguments:
+ * insn : Load/store instruction
+ * type : Instruction type
+ * reg : Register
+ * addr : Address
+ * handler : Exception handler
+ */
+#define EXC(insn, type, reg, addr, handler) \
+9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous
@@ -100,12 +115,13 @@
#ifdef USE_DOUBLE
-#define LOAD ld
-#define LOADL ldl
-#define LOADR ldr
-#define STOREL sdl
-#define STORER sdr
-#define STORE sd
+#define LOADK ld /* No exception */
+#define LOAD(reg, addr, handler) EXC(ld, LD_INSN, reg, addr, handler)
+#define LOADL(reg, addr, handler) EXC(ldl, LD_INSN, reg, addr, handler)
+#define LOADR(reg, addr, handler) EXC(ldr, LD_INSN, reg, addr, handler)
+#define STOREL(reg, addr, handler) EXC(sdl, ST_INSN, reg, addr, handler)
+#define STORER(reg, addr, handler) EXC(sdr, ST_INSN, reg, addr, handler)
+#define STORE(reg, addr, handler) EXC(sd, ST_INSN, reg, addr, handler)
#define ADD daddu
#define SUB dsubu
#define SRL dsrl
@@ -136,12 +152,13 @@
#else
-#define LOAD lw
-#define LOADL lwl
-#define LOADR lwr
-#define STOREL swl
-#define STORER swr
-#define STORE sw
+#define LOADK lw /* No exception */
+#define LOAD(reg, addr, handler) EXC(lw, LD_INSN, reg, addr, handler)
+#define LOADL(reg, addr, handler) EXC(lwl, LD_INSN, reg, addr, handler)
+#define LOADR(reg, addr, handler) EXC(lwr, LD_INSN, reg, addr, handler)
+#define STOREL(reg, addr, handler) EXC(swl, ST_INSN, reg, addr, handler)
+#define STORER(reg, addr, handler) EXC(swr, ST_INSN, reg, addr, handler)
+#define STORE(reg, addr, handler) EXC(sw, ST_INSN, reg, addr, handler)
#define ADD addu
#define SUB subu
#define SRL srl
@@ -154,6 +171,9 @@
#endif /* USE_DOUBLE */
+#define LOADB(reg, addr, handler) EXC(lb, LD_INSN, reg, addr, handler)
+#define STOREB(reg, addr, handler) EXC(sb, ST_INSN, reg, addr, handler)
+
#ifdef CONFIG_CPU_LITTLE_ENDIAN
#define LDFIRST LOADR
#define LDREST LOADL
@@ -243,25 +263,25 @@ __copy_user_common:
.align 4
1:
R10KCBARRIER(0(ra))
-EXC( LOAD t0, UNIT(0)(src), .Ll_exc)
-EXC( LOAD t1, UNIT(1)(src), .Ll_exc_copy)
-EXC( LOAD t2, UNIT(2)(src), .Ll_exc_copy)
-EXC( LOAD t3, UNIT(3)(src), .Ll_exc_copy)
+ LOAD(t0, UNIT(0)(src), .Ll_exc)
+ LOAD(t1, UNIT(1)(src), .Ll_exc_copy)
+ LOAD(t2, UNIT(2)(src), .Ll_exc_copy)
+ LOAD(t3, UNIT(3)(src), .Ll_exc_copy)
SUB len, len, 8*NBYTES
-EXC( LOAD t4, UNIT(4)(src), .Ll_exc_copy)
-EXC( LOAD t7, UNIT(5)(src), .Ll_exc_copy)
-EXC( STORE t0, UNIT(0)(dst), .Ls_exc_p8u)
-EXC( STORE t1, UNIT(1)(dst), .Ls_exc_p7u)
-EXC( LOAD t0, UNIT(6)(src), .Ll_exc_copy)
-EXC( LOAD t1, UNIT(7)(src), .Ll_exc_copy)
+ LOAD(t4, UNIT(4)(src), .Ll_exc_copy)
+ LOAD(t7, UNIT(5)(src), .Ll_exc_copy)
+ STORE(t0, UNIT(0)(dst), .Ls_exc_p8u)
+ STORE(t1, UNIT(1)(dst), .Ls_exc_p7u)
+ LOAD(t0, UNIT(6)(src), .Ll_exc_copy)
+ LOAD(t1, UNIT(7)(src), .Ll_exc_copy)
ADD src, src, 8*NBYTES
ADD dst, dst, 8*NBYTES
-EXC( STORE t2, UNIT(-6)(dst), .Ls_exc_p6u)
-EXC( STORE t3, UNIT(-5)(dst), .Ls_exc_p5u)
-EXC( STORE t4, UNIT(-4)(dst), .Ls_exc_p4u)
-EXC( STORE t7, UNIT(-3)(dst), .Ls_exc_p3u)
-EXC( STORE t0, UNIT(-2)(dst), .Ls_exc_p2u)
-EXC( STORE t1, UNIT(-1)(dst), .Ls_exc_p1u)
+ STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u)
+ STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u)
+ STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u)
+ STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u)
+ STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u)
+ STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u)
PREF( 0, 8*32(src) )
PREF( 1, 8*32(dst) )
bne len, rem, 1b
@@ -278,17 +298,17 @@ EXC( STORE t1, UNIT(-1)(dst), .Ls_exc_p1u)
/*
* len >= 4*NBYTES
*/
-EXC( LOAD t0, UNIT(0)(src), .Ll_exc)
-EXC( LOAD t1, UNIT(1)(src), .Ll_exc_copy)
-EXC( LOAD t2, UNIT(2)(src), .Ll_exc_copy)
-EXC( LOAD t3, UNIT(3)(src), .Ll_exc_copy)
+ LOAD( t0, UNIT(0)(src), .Ll_exc)
+ LOAD( t1, UNIT(1)(src), .Ll_exc_copy)
+ LOAD( t2, UNIT(2)(src), .Ll_exc_copy)
+ LOAD( t3, UNIT(3)(src), .Ll_exc_copy)
SUB len, len, 4*NBYTES
ADD src, src, 4*NBYTES
R10KCBARRIER(0(ra))
-EXC( STORE t0, UNIT(0)(dst), .Ls_exc_p4u)
-EXC( STORE t1, UNIT(1)(dst), .Ls_exc_p3u)
-EXC( STORE t2, UNIT(2)(dst), .Ls_exc_p2u)
-EXC( STORE t3, UNIT(3)(dst), .Ls_exc_p1u)
+ STORE(t0, UNIT(0)(dst), .Ls_exc_p4u)
+ STORE(t1, UNIT(1)(dst), .Ls_exc_p3u)
+ STORE(t2, UNIT(2)(dst), .Ls_exc_p2u)
+ STORE(t3, UNIT(3)(dst), .Ls_exc_p1u)
.set reorder /* DADDI_WAR */
ADD dst, dst, 4*NBYTES
beqz len, .Ldone
@@ -301,10 +321,10 @@ EXC( STORE t3, UNIT(3)(dst), .Ls_exc_p1u)
nop
1:
R10KCBARRIER(0(ra))
-EXC( LOAD t0, 0(src), .Ll_exc)
+ LOAD(t0, 0(src), .Ll_exc)
ADD src, src, NBYTES
SUB len, len, NBYTES
-EXC( STORE t0, 0(dst), .Ls_exc_p1u)
+ STORE(t0, 0(dst), .Ls_exc_p1u)
.set reorder /* DADDI_WAR */
ADD dst, dst, NBYTES
bne rem, len, 1b
@@ -326,10 +346,10 @@ EXC( STORE t0, 0(dst), .Ls_exc_p1u)
ADD t1, dst, len # t1 is just past last byte of dst
li bits, 8*NBYTES
SLL rem, len, 3 # rem = number of bits to keep
-EXC( LOAD t0, 0(src), .Ll_exc)
+ LOAD(t0, 0(src), .Ll_exc)
SUB bits, bits, rem # bits = number of bits to discard
SHIFT_DISCARD t0, t0, bits
-EXC( STREST t0, -1(t1), .Ls_exc)
+ STREST(t0, -1(t1), .Ls_exc)
jr ra
move len, zero
.Ldst_unaligned:
@@ -343,13 +363,13 @@ EXC( STREST t0, -1(t1), .Ls_exc)
* Set match = (src and dst have same alignment)
*/
#define match rem
-EXC( LDFIRST t3, FIRST(0)(src), .Ll_exc)
+ LDFIRST(t3, FIRST(0)(src), .Ll_exc)
ADD t2, zero, NBYTES
-EXC( 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
xor match, t0, t1
R10KCBARRIER(0(ra))
-EXC( STFIRST t3, FIRST(0)(dst), .Ls_exc)
+ STFIRST(t3, FIRST(0)(dst), .Ls_exc)
beq len, t2, .Ldone
SUB len, len, t2
ADD dst, dst, t2
@@ -370,24 +390,24 @@ EXC( STFIRST t3, FIRST(0)(dst), .Ls_exc)
* are to the same unit (unless src is aligned, but it's not).
*/
R10KCBARRIER(0(ra))
-EXC( LDFIRST t0, FIRST(0)(src), .Ll_exc)
-EXC( LDFIRST t1, FIRST(1)(src), .Ll_exc_copy)
+ LDFIRST(t0, FIRST(0)(src), .Ll_exc)
+ LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy)
SUB len, len, 4*NBYTES
-EXC( LDREST t0, REST(0)(src), .Ll_exc_copy)
-EXC( LDREST t1, REST(1)(src), .Ll_exc_copy)
-EXC( LDFIRST t2, FIRST(2)(src), .Ll_exc_copy)
-EXC( LDFIRST t3, FIRST(3)(src), .Ll_exc_copy)
-EXC( LDREST t2, REST(2)(src), .Ll_exc_copy)
-EXC( LDREST t3, REST(3)(src), .Ll_exc_copy)
+ LDREST(t0, REST(0)(src), .Ll_exc_copy)
+ LDREST(t1, REST(1)(src), .Ll_exc_copy)
+ LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy)
+ LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy)
+ LDREST(t2, REST(2)(src), .Ll_exc_copy)
+ LDREST(t3, REST(3)(src), .Ll_exc_copy)
PREF( 0, 9*32(src) ) # 0 is PREF_LOAD (not streamed)
ADD src, src, 4*NBYTES
#ifdef CONFIG_CPU_SB1
nop # improves slotting
#endif
-EXC( STORE t0, UNIT(0)(dst), .Ls_exc_p4u)
-EXC( STORE t1, UNIT(1)(dst), .Ls_exc_p3u)
-EXC( STORE t2, UNIT(2)(dst), .Ls_exc_p2u)
-EXC( STORE t3, UNIT(3)(dst), .Ls_exc_p1u)
+ STORE(t0, UNIT(0)(dst), .Ls_exc_p4u)
+ STORE(t1, UNIT(1)(dst), .Ls_exc_p3u)
+ STORE(t2, UNIT(2)(dst), .Ls_exc_p2u)
+ STORE(t3, UNIT(3)(dst), .Ls_exc_p1u)
PREF( 1, 9*32(dst) ) # 1 is PREF_STORE (not streamed)
.set reorder /* DADDI_WAR */
ADD dst, dst, 4*NBYTES
@@ -401,11 +421,11 @@ EXC( STORE t3, UNIT(3)(dst), .Ls_exc_p1u)
nop
1:
R10KCBARRIER(0(ra))
-EXC( LDFIRST t0, FIRST(0)(src), .Ll_exc)
-EXC( LDREST t0, REST(0)(src), .Ll_exc_copy)
+ LDFIRST(t0, FIRST(0)(src), .Ll_exc)
+ LDREST(t0, REST(0)(src), .Ll_exc_copy)
ADD src, src, NBYTES
SUB len, len, NBYTES
-EXC( STORE t0, 0(dst), .Ls_exc_p1u)
+ STORE(t0, 0(dst), .Ls_exc_p1u)
.set reorder /* DADDI_WAR */
ADD dst, dst, NBYTES
bne len, rem, 1b
@@ -418,10 +438,10 @@ EXC( STORE t0, 0(dst), .Ls_exc_p1u)
/* 0 < len < NBYTES */
R10KCBARRIER(0(ra))
#define COPY_BYTE(N) \
-EXC( lb t0, N(src), .Ll_exc); \
+ LOADB(t0, N(src), .Ll_exc); \
SUB len, len, 1; \
beqz len, .Ldone; \
-EXC( sb t0, N(dst), .Ls_exc_p1)
+ STOREB(t0, N(dst), .Ls_exc_p1)
COPY_BYTE(0)
COPY_BYTE(1)
@@ -431,10 +451,10 @@ EXC( sb t0, N(dst), .Ls_exc_p1)
COPY_BYTE(4)
COPY_BYTE(5)
#endif
-EXC( lb t0, NBYTES-2(src), .Ll_exc)
+ LOADB(t0, NBYTES-2(src), .Ll_exc)
SUB len, len, 1
jr ra
-EXC( sb t0, NBYTES-2(dst), .Ls_exc_p1)
+ STOREB(t0, NBYTES-2(dst), .Ls_exc_p1)
.Ldone:
jr ra
nop
@@ -451,11 +471,11 @@ EXC( sb t0, NBYTES-2(dst), .Ls_exc_p1)
*
* Assumes src < THREAD_BUADDR($28)
*/
- LOAD t0, TI_TASK($28)
+ LOADK t0, TI_TASK($28)
nop
- LOAD t0, THREAD_BUADDR(t0)
+ LOADK t0, THREAD_BUADDR(t0)
1:
-EXC( lb t1, 0(src), .Ll_exc)
+ LOADB(t1, 0(src), .Ll_exc)
ADD src, src, 1
sb t1, 0(dst) # can't fault -- we're copy_from_user
.set reorder /* DADDI_WAR */
@@ -463,9 +483,9 @@ EXC( lb t1, 0(src), .Ll_exc)
bne src, t0, 1b
.set noreorder
.Ll_exc:
- LOAD t0, TI_TASK($28)
+ LOADK t0, TI_TASK($28)
nop
- LOAD t0, THREAD_BUADDR(t0) # t0 is just past last good address
+ 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 14:09:51 +0000