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authorArnd Bergmann <arnd@arndb.de>2022-02-11 08:30:59 +0100
committerArnd Bergmann <arnd@arndb.de>2022-02-25 09:36:05 +0100
commit8afafbc955ba6fc04b1e202b21856020152d12c9 (patch)
tree73d0d5737045be24c23f6b00250b1ee1f52baf19 /arch/sparc/include/asm
parentnds32: fix access_ok() checks in get/put_user (diff)
downloadlinux-dev-8afafbc955ba6fc04b1e202b21856020152d12c9.tar.xz
linux-dev-8afafbc955ba6fc04b1e202b21856020152d12c9.zip
sparc64: add __{get,put}_kernel_nofault()
sparc64 is one of the architectures that uses separate address spaces for kernel and user addresses, so __get_kernel_nofault() can not just call into the normal __get_user() without the access_ok() check. Instead duplicate __get_user() and __put_user() into their in-kernel versions, with minor changes for the calling conventions and leaving out the address space modifier on the assembler instruction. This could surely be written more elegantly, but duplicating it gets the job done. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/sparc/include/asm')
-rw-r--r--arch/sparc/include/asm/uaccess_64.h78
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
index 30eb4c6414d1..b283798315b1 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -100,6 +100,42 @@ void __retl_efault(void);
struct __large_struct { unsigned long buf[100]; };
#define __m(x) ((struct __large_struct *)(x))
+#define __put_kernel_nofault(dst, src, type, label) \
+do { \
+ type *addr = (type __force *)(dst); \
+ type data = *(type *)src; \
+ register int __pu_ret; \
+ switch (sizeof(type)) { \
+ case 1: __put_kernel_asm(data, b, addr, __pu_ret); break; \
+ case 2: __put_kernel_asm(data, h, addr, __pu_ret); break; \
+ case 4: __put_kernel_asm(data, w, addr, __pu_ret); break; \
+ case 8: __put_kernel_asm(data, x, addr, __pu_ret); break; \
+ default: __pu_ret = __put_user_bad(); break; \
+ } \
+ if (__pu_ret) \
+ goto label; \
+} while (0)
+
+#define __put_kernel_asm(x, size, addr, ret) \
+__asm__ __volatile__( \
+ "/* Put kernel asm, inline. */\n" \
+ "1:\t" "st"#size " %1, [%2]\n\t" \
+ "clr %0\n" \
+ "2:\n\n\t" \
+ ".section .fixup,#alloc,#execinstr\n\t" \
+ ".align 4\n" \
+ "3:\n\t" \
+ "sethi %%hi(2b), %0\n\t" \
+ "jmpl %0 + %%lo(2b), %%g0\n\t" \
+ " mov %3, %0\n\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, 3b\n\t" \
+ ".previous\n\n\t" \
+ : "=r" (ret) : "r" (x), "r" (__m(addr)), \
+ "i" (-EFAULT))
+
#define __put_user_nocheck(data, addr, size) ({ \
register int __pu_ret; \
switch (size) { \
@@ -134,6 +170,48 @@ __asm__ __volatile__( \
int __put_user_bad(void);
+#define __get_kernel_nofault(dst, src, type, label) \
+do { \
+ type *addr = (type __force *)(src); \
+ register int __gu_ret; \
+ register unsigned long __gu_val; \
+ switch (sizeof(type)) { \
+ case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
+ case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
+ case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
+ case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break; \
+ default: \
+ __gu_val = 0; \
+ __gu_ret = __get_user_bad(); \
+ break; \
+ } \
+ if (__gu_ret) \
+ goto label; \
+ *(type *)dst = (__force type) __gu_val; \
+} while (0)
+#define __get_kernel_asm(x, size, addr, ret) \
+__asm__ __volatile__( \
+ "/* Get kernel asm, inline. */\n" \
+ "1:\t" "ld"#size " [%2], %1\n\t" \
+ "clr %0\n" \
+ "2:\n\n\t" \
+ ".section .fixup,#alloc,#execinstr\n\t" \
+ ".align 4\n" \
+ "3:\n\t" \
+ "sethi %%hi(2b), %0\n\t" \
+ "clr %1\n\t" \
+ "jmpl %0 + %%lo(2b), %%g0\n\t" \
+ " mov %3, %0\n\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, 3b\n\n\t" \
+ ".previous\n\t" \
+ : "=r" (ret), "=r" (x) : "r" (__m(addr)), \
+ "i" (-EFAULT))
+
+#define HAVE_GET_KERNEL_NOFAULT
+
#define __get_user_nocheck(data, addr, size, type) ({ \
register int __gu_ret; \
register unsigned long __gu_val; \