1 files changed, 223 insertions, 0 deletions

diff --git a/arch/tile/lib/usercopy_32.S b/arch/tile/lib/usercopy_32.S
new file mode 100644
index 000000000000..979f76d83746
--- /dev/null
+++ b/arch/tile/lib/usercopy_32.S
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#include <linux/linkage.h>
+#include <asm/errno.h>
+#include <asm/cache.h>
+#include <arch/chip.h>
+
+/* Access user memory, but use MMU to avoid propagating kernel exceptions. */
+
+        .pushsection .fixup,"ax"
+
+get_user_fault:
+        { move r0, zero; move r1, zero }
+        { movei r2, -EFAULT; jrp lr }
+        ENDPROC(get_user_fault)
+
+put_user_fault:
+        { movei r0, -EFAULT; jrp lr }
+        ENDPROC(put_user_fault)
+
+        .popsection
+
+/*
+ * __get_user_N functions take a pointer in r0, and return 0 in r2
+ * on success, with the value in r0; or else -EFAULT in r2.
+ */
+#define __get_user_N(bytes, LOAD) \
+        STD_ENTRY(__get_user_##bytes); \
+1:      { LOAD r0, r0; move r1, zero; move r2, zero }; \
+        jrp lr; \
+        STD_ENDPROC(__get_user_##bytes); \
+        .pushsection __ex_table,"a"; \
+        .word 1b, get_user_fault; \
+        .popsection
+
+__get_user_N(1, lb_u)
+__get_user_N(2, lh_u)
+__get_user_N(4, lw)
+
+/*
+ * __get_user_8 takes a pointer in r0, and returns 0 in r2
+ * on success, with the value in r0/r1; or else -EFAULT in r2.
+ */
+        STD_ENTRY(__get_user_8);
+1:      { lw r0, r0; addi r1, r0, 4 };
+2:      { lw r1, r1; move r2, zero };
+        jrp lr;
+        STD_ENDPROC(__get_user_8);
+        .pushsection __ex_table,"a";
+        .word 1b, get_user_fault;
+        .word 2b, get_user_fault;
+        .popsection
+
+/*
+ * __put_user_N functions take a value in r0 and a pointer in r1,
+ * and return 0 in r0 on success or -EFAULT on failure.
+ */
+#define __put_user_N(bytes, STORE) \
+        STD_ENTRY(__put_user_##bytes); \
+1:      { STORE r1, r0; move r0, zero }; \
+        jrp lr; \
+        STD_ENDPROC(__put_user_##bytes); \
+        .pushsection __ex_table,"a"; \
+        .word 1b, put_user_fault; \
+        .popsection
+
+__put_user_N(1, sb)
+__put_user_N(2, sh)
+__put_user_N(4, sw)
+
+/*
+ * __put_user_8 takes a value in r0/r1 and a pointer in r2,
+ * and returns 0 in r0 on success or -EFAULT on failure.
+ */
+STD_ENTRY(__put_user_8)
+1:      { sw r2, r0; addi r2, r2, 4 }
+2:      { sw r2, r1; move r0, zero }
+        jrp lr
+        STD_ENDPROC(__put_user_8)
+        .pushsection __ex_table,"a"
+        .word 1b, put_user_fault
+        .word 2b, put_user_fault
+        .popsection
+
+
+/*
+ * strnlen_user_asm takes the pointer in r0, and the length bound in r1.
+ * It returns the length, including the terminating NUL, or zero on exception.
+ * If length is greater than the bound, returns one plus the bound.
+ */
+STD_ENTRY(strnlen_user_asm)
+        { bz r1, 2f; addi r3, r0, -1 }  /* bias down to include NUL */
+1:      { lb_u r4, r0; addi r1, r1, -1 }
+        bz r4, 2f
+        { bnzt r1, 1b; addi r0, r0, 1 }
+2:      { sub r0, r0, r3; jrp lr }
+        STD_ENDPROC(strnlen_user_asm)
+        .pushsection .fixup,"ax"
+strnlen_user_fault:
+        { move r0, zero; jrp lr }
+        ENDPROC(strnlen_user_fault)
+        .section __ex_table,"a"
+        .word 1b, strnlen_user_fault
+        .popsection
+
+/*
+ * strncpy_from_user_asm takes the kernel target pointer in r0,
+ * the userspace source pointer in r1, and the length bound (including
+ * the trailing NUL) in r2.  On success, it returns the string length
+ * (not including the trailing NUL), or -EFAULT on failure.
+ */
+STD_ENTRY(strncpy_from_user_asm)
+        { bz r2, 2f; move r3, r0 }
+1:      { lb_u r4, r1; addi r1, r1, 1; addi r2, r2, -1 }
+        { sb r0, r4; addi r0, r0, 1 }
+        bz r2, 2f
+        bnzt r4, 1b
+        addi r0, r0, -1   /* don't count the trailing NUL */
+2:      { sub r0, r0, r3; jrp lr }
+        STD_ENDPROC(strncpy_from_user_asm)
+        .pushsection .fixup,"ax"
+strncpy_from_user_fault:
+        { movei r0, -EFAULT; jrp lr }
+        ENDPROC(strncpy_from_user_fault)
+        .section __ex_table,"a"
+        .word 1b, strncpy_from_user_fault
+        .popsection
+
+/*
+ * clear_user_asm takes the user target address in r0 and the
+ * number of bytes to zero in r1.
+ * It returns the number of uncopiable bytes (hopefully zero) in r0.
+ * Note that we don't use a separate .fixup section here since we fall
+ * through into the "fixup" code as the last straight-line bundle anyway.
+ */
+STD_ENTRY(clear_user_asm)
+        { bz r1, 2f; or r2, r0, r1 }
+        andi r2, r2, 3
+        bzt r2, .Lclear_aligned_user_asm
+1:      { sb r0, zero; addi r0, r0, 1; addi r1, r1, -1 }
+        bnzt r1, 1b
+2:      { move r0, r1; jrp lr }
+        .pushsection __ex_table,"a"
+        .word 1b, 2b
+        .popsection
+
+.Lclear_aligned_user_asm:
+1:      { sw r0, zero; addi r0, r0, 4; addi r1, r1, -4 }
+        bnzt r1, 1b
+2:      { move r0, r1; jrp lr }
+        STD_ENDPROC(clear_user_asm)
+        .pushsection __ex_table,"a"
+        .word 1b, 2b
+        .popsection
+
+/*
+ * flush_user_asm takes the user target address in r0 and the
+ * number of bytes to flush in r1.
+ * It returns the number of unflushable bytes (hopefully zero) in r0.
+ */
+STD_ENTRY(flush_user_asm)
+        bz r1, 2f
+        { movei r2, L2_CACHE_BYTES; add r1, r0, r1 }
+        { sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 }
+        { and r0, r0, r2; and r1, r1, r2 }
+        { sub r1, r1, r0 }
+1:      { flush r0; addi r1, r1, -CHIP_FLUSH_STRIDE() }
+        { addi r0, r0, CHIP_FLUSH_STRIDE(); bnzt r1, 1b }
+2:      { move r0, r1; jrp lr }
+        STD_ENDPROC(flush_user_asm)
+        .pushsection __ex_table,"a"
+        .word 1b, 2b
+        .popsection
+
+/*
+ * inv_user_asm takes the user target address in r0 and the
+ * number of bytes to invalidate in r1.
+ * It returns the number of not inv'able bytes (hopefully zero) in r0.
+ */
+STD_ENTRY(inv_user_asm)
+        bz r1, 2f
+        { movei r2, L2_CACHE_BYTES; add r1, r0, r1 }
+        { sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 }
+        { and r0, r0, r2; and r1, r1, r2 }
+        { sub r1, r1, r0 }
+1:      { inv r0; addi r1, r1, -CHIP_INV_STRIDE() }
+        { addi r0, r0, CHIP_INV_STRIDE(); bnzt r1, 1b }
+2:      { move r0, r1; jrp lr }
+        STD_ENDPROC(inv_user_asm)
+        .pushsection __ex_table,"a"
+        .word 1b, 2b
+        .popsection
+
+/*
+ * finv_user_asm takes the user target address in r0 and the
+ * number of bytes to flush-invalidate in r1.
+ * It returns the number of not finv'able bytes (hopefully zero) in r0.
+ */
+STD_ENTRY(finv_user_asm)
+        bz r1, 2f
+        { movei r2, L2_CACHE_BYTES; add r1, r0, r1 }
+        { sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 }
+        { and r0, r0, r2; and r1, r1, r2 }
+        { sub r1, r1, r0 }
+1:      { finv r0; addi r1, r1, -CHIP_FINV_STRIDE() }
+        { addi r0, r0, CHIP_FINV_STRIDE(); bnzt r1, 1b }
+2:      { move r0, r1; jrp lr }
+        STD_ENDPROC(finv_user_asm)
+        .pushsection __ex_table,"a"
+        .word 1b, 2b
+        .popsection