[SPARC64]: Fix fault handling in unaligned trap handler.

We were not calling kernel_mna_trap_fault() correctly.
Instead of being fancy, just return 0 vs. -EFAULT from
the assembler stubs, and handle that return value as
appropriate.

Create an "__retl_efault" stub for assembler exception
table entries and use it where possible.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 34 insertions, 23 deletions

diff --git a/arch/sparc64/kernel/sys32.S b/arch/sparc64/kernel/sys32.S
index 4fb99e0bc7c3..9cd272ac3ac1 100644
--- a/arch/sparc64/kernel/sys32.S
+++ b/arch/sparc64/kernel/sys32.S
@@ -157,6 +157,9 @@ sys32_socketcall:	/* %o0=call, %o1=args */
         or              %g2, %lo(__socketcall_table_begin), %g2
         jmpl            %g2 + %o0, %g0
          nop
+do_einval:
+        retl
+         mov            -EINVAL, %o0
 
         .align          32
 __socketcall_table_begin:
@@ -316,29 +319,37 @@ do_sys_recvmsg: /* compat_sys_recvmsg(int, struct compat_msghdr *, unsigned int)
         nop
         nop
 
-do_einval:
-        retl
-         mov            -EINVAL, %o0
-do_efault:
-        retl
-         mov            -EFAULT, %o0
-
         .section        __ex_table
         .align          4
-        .word   1b, do_efault, 2b, do_efault, 3b, do_efault, 4b, do_efault
-        .word   5b, do_efault, 6b, do_efault, 7b, do_efault, 8b, do_efault
-        .word   9b, do_efault, 10b, do_efault, 11b, do_efault, 12b, do_efault
-        .word   13b, do_efault, 14b, do_efault, 15b, do_efault, 16b, do_efault
-        .word   17b, do_efault, 18b, do_efault, 19b, do_efault, 20b, do_efault
-        .word   21b, do_efault, 22b, do_efault, 23b, do_efault, 24b, do_efault
-        .word   25b, do_efault, 26b, do_efault, 27b, do_efault, 28b, do_efault
-        .word   29b, do_efault, 30b, do_efault, 31b, do_efault, 32b, do_efault
-        .word   33b, do_efault, 34b, do_efault, 35b, do_efault, 36b, do_efault
-        .word   37b, do_efault, 38b, do_efault, 39b, do_efault, 40b, do_efault
-        .word   41b, do_efault, 42b, do_efault, 43b, do_efault, 44b, do_efault
-        .word   45b, do_efault, 46b, do_efault, 47b, do_efault, 48b, do_efault
-        .word   49b, do_efault, 50b, do_efault, 51b, do_efault, 52b, do_efault
-        .word   53b, do_efault, 54b, do_efault, 55b, do_efault, 56b, do_efault
-        .word   57b, do_efault, 58b, do_efault, 59b, do_efault, 60b, do_efault
-        .word   61b, do_efault, 62b, do_efault
+        .word           1b, __retl_efault, 2b, __retl_efault
+        .word           3b, __retl_efault, 4b, __retl_efault
+        .word           5b, __retl_efault, 6b, __retl_efault
+        .word           7b, __retl_efault, 8b, __retl_efault
+        .word           9b, __retl_efault, 10b, __retl_efault
+        .word           11b, __retl_efault, 12b, __retl_efault
+        .word           13b, __retl_efault, 14b, __retl_efault
+        .word           15b, __retl_efault, 16b, __retl_efault
+        .word           17b, __retl_efault, 18b, __retl_efault
+        .word           19b, __retl_efault, 20b, __retl_efault
+        .word           21b, __retl_efault, 22b, __retl_efault
+        .word           23b, __retl_efault, 24b, __retl_efault
+        .word           25b, __retl_efault, 26b, __retl_efault
+        .word           27b, __retl_efault, 28b, __retl_efault
+        .word           29b, __retl_efault, 30b, __retl_efault
+        .word           31b, __retl_efault, 32b, __retl_efault
+        .word           33b, __retl_efault, 34b, __retl_efault
+        .word           35b, __retl_efault, 36b, __retl_efault
+        .word           37b, __retl_efault, 38b, __retl_efault
+        .word           39b, __retl_efault, 40b, __retl_efault
+        .word           41b, __retl_efault, 42b, __retl_efault
+        .word           43b, __retl_efault, 44b, __retl_efault
+        .word           45b, __retl_efault, 46b, __retl_efault
+        .word           47b, __retl_efault, 48b, __retl_efault
+        .word           49b, __retl_efault, 50b, __retl_efault
+        .word           51b, __retl_efault, 52b, __retl_efault
+        .word           53b, __retl_efault, 54b, __retl_efault
+        .word           55b, __retl_efault, 56b, __retl_efault
+        .word           57b, __retl_efault, 58b, __retl_efault
+        .word           59b, __retl_efault, 60b, __retl_efault
+        .word           61b, __retl_efault, 62b, __retl_efault
         .previous