linux-kernel - [PATCH 16/24] ARM64:ILP32 use the standard start_thread for ILP32 so the processor state is not AARCH32.

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Message-Id: <1400914939-9708-17-git-send-email-apinski@cavium.com>
Date:	Sat, 24 May 2014 00:02:11 -0700
From:	Andrew Pinski <apinski@...ium.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Pinski <apinski@...ium.com>
Subject: [PATCH 16/24] ARM64:ILP32 use the standard start_thread for ILP32 so the processor state is not AARCH32.

If we have both ILP32 and AARCH32 compiled in, we need use the non compat start thread for ILP32.  We have to use TIF_32BIT_AARCH64 explicit due to header depency issues.

Thanks,
Andrew Pinski

Signed-off-by: Andrew Pinski <apinski@...ium.com>
---
 arch/arm64/include/asm/processor.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index ee487f3..c61deaf 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -103,6 +103,15 @@ static inline void start_thread(struct pt_regs *regs, unsigned long pc,
 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
 				       unsigned long sp)
 {
+#ifdef CONFIG_ARM64_ILP32
+	/* ILP32 thread are started the same way as LP64 threads.
+	   Note we cannot use is_ilp32_compat_task here as that
+	   would introduce a header depency issue.  */
+	if (test_thread_flag(TIF_32BIT_AARCH64)) {
+		start_thread(regs, pc, sp);
+		return;
+	}
+#endif
 	start_thread_common(regs, pc);
 	regs->pstate = COMPAT_PSR_MODE_USR;
 	if (pc & 1)
-- 
1.7.2.5

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