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[SPARC64]: Fix linkage of enormous kernels.

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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>
This commit is contained in:
David S. Miller 2007-10-30 21:11:28 -07:00
parent d6898556e9
commit 52eb053b71
3 changed files with 11 additions and 5 deletions
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6
include/asm-sparc64/futex.h
View File

@ -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"

4
include/asm-sparc64/system.h
View File

@ -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) \

6
include/asm-sparc64/uaccess.h
View File

@ -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" \