From 52eb053b7191f1d3017a56e921753e3097876c47 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 30 Oct 2007 21:11:28 -0700 Subject: [PATCH] [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 --- include/asm-sparc64/futex.h | 6 ++++-- include/asm-sparc64/system.h | 4 +++- include/asm-sparc64/uaccess.h | 6 ++++-- 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h index 876312fe82..df1097d6ff 100644 --- 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 159e62b51d..99a669c190 100644 --- 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 afe236ba55..93720e7b02 100644 --- 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" \ -- 2.39.5