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

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

diff --git a/kernel/arch/arm64/lib/copy_from_user.S b/kernel/arch/arm64/lib/copy_from_user.S
index 5e27add..4699cd7 100644 (file)
--- a/kernel/arch/arm64/lib/copy_from_user.S
+++ b/kernel/arch/arm64/lib/copy_from_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 from user space to a kernel buffer (alignment handled by the hardware)
@@ -27,40 +32,58 @@
  * Returns:
  *     x0 - bytes not copied
  */
+
+       .macro ldrb1 ptr, regB, val
+       USER(9998f, ldrb  \ptr, [\regB], \val)
+       .endm
+
+       .macro strb1 ptr, regB, val
+       strb \ptr, [\regB], \val
+       .endm
+
+       .macro ldrh1 ptr, regB, val
+       USER(9998f, ldrh  \ptr, [\regB], \val)
+       .endm
+
+       .macro strh1 ptr, regB, val
+       strh \ptr, [\regB], \val
+       .endm
+
+       .macro ldr1 ptr, regB, val
+       USER(9998f, ldr \ptr, [\regB], \val)
+       .endm
+
+       .macro str1 ptr, regB, val
+       str \ptr, [\regB], \val
+       .endm
+
+       .macro ldp1 ptr, regB, regC, val
+       USER(9998f, ldp \ptr, \regB, [\regC], \val)
+       .endm
+
+       .macro stp1 ptr, regB, regC, val
+       stp \ptr, \regB, [\regC], \val
+       .endm
+
+end    .req    x5
 ENTRY(__copy_from_user)
-       add     x4, x1, x2                      // upper user buffer boundary
-       subs    x2, x2, #8
-       b.mi    2f
-1:
-USER(9f, ldr   x3, [x1], #8    )
-       subs    x2, x2, #8
-       str     x3, [x0], #8
-       b.pl    1b
-2:     adds    x2, x2, #4
-       b.mi    3f
-USER(9f, ldr   w3, [x1], #4    )
-       sub     x2, x2, #4
-       str     w3, [x0], #4
-3:     adds    x2, x2, #2
-       b.mi    4f
-USER(9f, ldrh  w3, [x1], #2    )
-       sub     x2, x2, #2
-       strh    w3, [x0], #2
-4:     adds    x2, x2, #1
-       b.mi    5f
-USER(9f, ldrb  w3, [x1]        )
-       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                          // Nothing to copy
        ret
 ENDPROC(__copy_from_user)
 
        .section .fixup,"ax"
        .align  2
-9:     sub     x2, x4, x1
-       mov     x3, x2
-10:    strb    wzr, [x0], #1                   // zero remaining buffer space
-       subs    x3, x3, #1
-       b.ne    10b
-       mov     x0, x2                          // bytes not copied
+9998:
+       sub     x0, end, dst
+9999:
+       strb    wzr, [dst], #1                  // zero remaining buffer space
+       cmp     dst, end
+       b.lo    9999b
        ret
        .previous