MIPS: asm: elf: Set O32 default FPU flags

Set good default FPU flags (FR0) for O32 binaries similar to what the
kernel does for the N64/N32 ones. This also fixes a regression
introduced in commit 46490b572544 ("MIPS: kernel: elf: Improve the
overall ABI and FPU mode checks") when MIPS_O32_FP64_SUPPORT is
disabled. In that case, the mips_set_personality_fp() did not set the
FPU mode at all because it assumed that the FPU mode was already set
properly. That led to O32 userland problems.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Reported-by: Mans Rullgard <mans@mansr.com>
Fixes: 46490b572544 ("MIPS: kernel: elf: Improve the overall ABI and FPU mode checks")
Tested-by: Mans Rullgard <mans@mansr.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/9344/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h
index 535f196ffe02..694925a26924 100644
--- a/arch/mips/include/asm/elf.h
+++ b/arch/mips/include/asm/elf.h
@@ -294,6 +294,9 @@ do {									\
         if (personality(current->personality) != PER_LINUX)             \
                 set_personality(PER_LINUX);                             \
                                                                         \
+        clear_thread_flag(TIF_HYBRID_FPREGS);                           \
+        set_thread_flag(TIF_32BIT_FPREGS);                              \
+                                                                        \
         mips_set_personality_fp(state);                                 \
                                                                         \
         current->thread.abi = &mips_abi;                                \
@@ -319,6 +322,8 @@ do {									\
         do {                                                            \
                 set_thread_flag(TIF_32BIT_REGS);                        \
                 set_thread_flag(TIF_32BIT_ADDR);                        \
+                clear_thread_flag(TIF_HYBRID_FPREGS);                   \
+                set_thread_flag(TIF_32BIT_FPREGS);                      \
                                                                         \
                 mips_set_personality_fp(state);                         \
                                                                         \