[SPARC64]: Fix linkage of enormous kernels.

This was found by make randconfig

If the kernel .text is very large, the .fixup section branches
are too far away to be relocated correctly.

Use "sethi %hi(label), reg; jmpl reg + %lo(label); %g0" sequence
instead of the branch to fix this.

There is another case in switch_to() involving a branch, which
is fixed similarly.

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

diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h
index 876312fe82ccf9dbf894a100a26978a5f8267f10..df1097d6ffbe63258dc566924cedb9e393438d5f 100644 (file)
--- a/include/asm-sparc64/futex.h
+++ b/include/asm-sparc64/futex.h
@@ -17,7 +17,8 @@
        "3:\n"                                          \
        "       .section .fixup,#alloc,#execinstr\n"    \
        "       .align  4\n"                            \
-       "4:     ba      3b\n"                           \
+       "4:     sethi   %%hi(3b), %0\n"                 \
+       "       jmpl    %0 + %%lo(3b), %%g0\n"          \
        "        mov    %5, %0\n"                       \
        "       .previous\n"                            \
        "       .section __ex_table,\"a\"\n"            \
@@ -91,7 +92,8 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
        "2:\n"
        "       .section .fixup,#alloc,#execinstr\n"
        "       .align  4\n"
-       "3:     ba      2b\n"
+       "3:     sethi   %%hi(2b), %0\n"
+       "       jmpl    %0 + %%lo(2b), %%g0\n"
        "        mov    %4, %0\n"
        "       .previous\n"
        "       .section __ex_table,\"a\"\n"

diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h
index 159e62b51d705055b7b975ab4a4f68f21c6e429a..99a669c190c776a030ddc2be595693982a1c3fe0 100644 (file)
--- a/include/asm-sparc64/system.h
+++ b/include/asm-sparc64/system.h
@@ -178,7 +178,9 @@ do {        if (test_thread_flag(TIF_PERFCTR)) {                            \
        "ldx    [%%g6 + %9], %%g4\n\t"                                  \
        "brz,pt %%o7, 1f\n\t"                                           \
        " mov   %%g7, %0\n\t"                                           \
-       "b,a ret_from_syscall\n\t"                                      \
+       "sethi  %%hi(ret_from_syscall), %%g1\n\t"                       \
+       "jmpl   %%g1 + %%lo(ret_from_syscall), %%g0\n\t"                \
+       " nop\n\t"                                                      \
        "1:\n\t"                                                        \
        : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
          "=r" (__local_per_cpu_offset)                                 \

diff --git a/include/asm-sparc64/uaccess.h b/include/asm-sparc64/uaccess.h
index afe236ba555b97527f197079ec213e0c38ee6307..93720e7b0289250267dbc461b1defb9d4160e6e5 100644 (file)
--- a/include/asm-sparc64/uaccess.h
+++ b/include/asm-sparc64/uaccess.h
@@ -123,7 +123,8 @@ __asm__ __volatile__(                                                       \
        ".section .fixup,#alloc,#execinstr\n\t"                         \
        ".align 4\n"                                                    \
 "3:\n\t"                                                               \
-       "b      2b\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"                                 \
@@ -165,8 +166,9 @@ __asm__ __volatile__(                                                       \
        ".section .fixup,#alloc,#execinstr\n\t"                         \
        ".align 4\n"                                                    \
 "3:\n\t"                                                               \
+       "sethi  %%hi(2b), %0\n\t"                                       \
        "clr    %1\n\t"                                                 \
-       "b      2b\n\t"                                                 \
+       "jmpl   %0 + %%lo(2b), %%g0\n\t"                                \
        " mov   %3, %0\n\n\t"                                           \
        ".previous\n\t"                                                 \
        ".section __ex_table,\"a\"\n\t"                                 \