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authorJordan Niethe <jniethe5@gmail.com>2020-05-15 04:12:55 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2020-05-18 16:10:39 +0200
commit650b55b707fdfa764e9f2b81314d3eb4216fb962 (patch)
tree33027daca271c94467f02d17945afc0517929171 /arch/powerpc/include/asm/uaccess.h
parentpowerpc/optprobes: Add register argument to patch_imm64_load_insns() (diff)
downloadlinux-650b55b707fdfa764e9f2b81314d3eb4216fb962.tar.xz
linux-650b55b707fdfa764e9f2b81314d3eb4216fb962.zip
powerpc: Add prefixed instructions to instruction data type
For powerpc64, redefine the ppc_inst type so both word and prefixed instructions can be represented. On powerpc32 the type will remain the same. Update places which had assumed instructions to be 4 bytes long. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Reviewed-by: Alistair Popple <alistair@popple.id.au> [mpe: Rework the get_user_inst() macros to be parameterised, and don't assign to the dest if an error occurred. Use CONFIG_PPC64 not __powerpc64__ in a few places. Address other comments from Christophe. Fix some sparse complaints.] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200506034050.24806-24-jniethe5@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/uaccess.h')
-rw-r--r--arch/powerpc/include/asm/uaccess.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 0d2d0c3dc527..c0523efa1458 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -105,6 +105,40 @@ static inline int __access_ok(unsigned long addr, unsigned long size,
#define __put_user_inatomic(x, ptr) \
__put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
+#ifdef CONFIG_PPC64
+
+#define ___get_user_instr(gu_op, dest, ptr) \
+({ \
+ long __gui_ret = 0; \
+ unsigned long __gui_ptr = (unsigned long)ptr; \
+ struct ppc_inst __gui_inst; \
+ unsigned int __prefix, __suffix; \
+ __gui_ret = gu_op(__prefix, (unsigned int __user *)__gui_ptr); \
+ if (__gui_ret == 0) { \
+ if ((__prefix >> 26) == OP_PREFIX) { \
+ __gui_ret = gu_op(__suffix, \
+ (unsigned int __user *)__gui_ptr + 1); \
+ __gui_inst = ppc_inst_prefix(__prefix, \
+ __suffix); \
+ } else { \
+ __gui_inst = ppc_inst(__prefix); \
+ } \
+ if (__gui_ret == 0) \
+ (dest) = __gui_inst; \
+ } \
+ __gui_ret; \
+})
+
+#define get_user_instr(x, ptr) \
+ ___get_user_instr(get_user, x, ptr)
+
+#define __get_user_instr(x, ptr) \
+ ___get_user_instr(__get_user, x, ptr)
+
+#define __get_user_instr_inatomic(x, ptr) \
+ ___get_user_instr(__get_user_inatomic, x, ptr)
+
+#else /* !CONFIG_PPC64 */
#define get_user_instr(x, ptr) \
get_user((x).val, (u32 __user *)(ptr))
@@ -114,6 +148,8 @@ static inline int __access_ok(unsigned long addr, unsigned long size,
#define __get_user_instr_inatomic(x, ptr) \
__get_user_nosleep((x).val, (u32 __user *)(ptr), sizeof(u32))
+#endif /* CONFIG_PPC64 */
+
extern long __put_user_bad(void);
/*