These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / arm64 / lib / copy_to_user.S

diff --git a/kernel/arch/arm64/lib/copy_to_user.S b/kernel/arch/arm64/lib/copy_to_user.S
index a0aeeb9..7512bbb 100644 (file)
--- a/kernel/arch/arm64/lib/copy_to_user.S
+++ b/kernel/arch/arm64/lib/copy_to_user.S
@@ -15,7 +15,12 @@
  */
 
 #include <linux/linkage.h>
+
+#include <asm/alternative.h>
 #include <asm/assembler.h>
+#include <asm/cache.h>
+#include <asm/cpufeature.h>
+#include <asm/sysreg.h>
 
 /*
  * Copy to user space from a kernel buffer (alignment handled by the hardware)
@@ -27,35 +32,52 @@
  * Returns:
  *     x0 - bytes not copied
  */
+       .macro ldrb1 ptr, regB, val
+       ldrb  \ptr, [\regB], \val
+       .endm
+
+       .macro strb1 ptr, regB, val
+       USER(9998f, strb \ptr, [\regB], \val)
+       .endm
+
+       .macro ldrh1 ptr, regB, val
+       ldrh  \ptr, [\regB], \val
+       .endm
+
+       .macro strh1 ptr, regB, val
+       USER(9998f, strh \ptr, [\regB], \val)
+       .endm
+
+       .macro ldr1 ptr, regB, val
+       ldr \ptr, [\regB], \val
+       .endm
+
+       .macro str1 ptr, regB, val
+       USER(9998f, str \ptr, [\regB], \val)
+       .endm
+
+       .macro ldp1 ptr, regB, regC, val
+       ldp \ptr, \regB, [\regC], \val
+       .endm
+
+       .macro stp1 ptr, regB, regC, val
+       USER(9998f, stp \ptr, \regB, [\regC], \val)
+       .endm
+
+end    .req    x5
 ENTRY(__copy_to_user)
-       add     x4, x0, x2                      // upper user buffer boundary
-       subs    x2, x2, #8
-       b.mi    2f
-1:
-       ldr     x3, [x1], #8
-       subs    x2, x2, #8
-USER(9f, str   x3, [x0], #8    )
-       b.pl    1b
-2:     adds    x2, x2, #4
-       b.mi    3f
-       ldr     w3, [x1], #4
-       sub     x2, x2, #4
-USER(9f, str   w3, [x0], #4    )
-3:     adds    x2, x2, #2
-       b.mi    4f
-       ldrh    w3, [x1], #2
-       sub     x2, x2, #2
-USER(9f, strh  w3, [x0], #2    )
-4:     adds    x2, x2, #1
-       b.mi    5f
-       ldrb    w3, [x1]
-USER(9f, strb  w3, [x0]        )
-5:     mov     x0, #0
+ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
+           CONFIG_ARM64_PAN)
+       add     end, x0, x2
+#include "copy_template.S"
+ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \
+           CONFIG_ARM64_PAN)
+       mov     x0, #0
        ret
 ENDPROC(__copy_to_user)
 
        .section .fixup,"ax"
        .align  2
-9:     sub     x0, x4, x0                      // bytes not copied
+9998:  sub     x0, end, dst                    // bytes not copied
        ret
        .previous