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authorH. Peter Anvin <hpa@zytor.com>2012-02-14 13:56:49 -0800
committerH. Peter Anvin <hpa@zytor.com>2012-02-20 12:48:49 -0800
commitbb2127240c5595ae4ef7115494f51e973692f64e (patch)
tree5e1318eba21d79facf436673ae682f85f0b4d978
parentd046ff8b30319d9aa38d877a0ba4206771e54346 (diff)
x32: Add a thread flag for x32 processes
An x32 process is *almost* the same thing as a 64-bit process with a 32-bit address limit, but there are a few minor differences -- in particular core dumps are 32 bits and signal handling is different. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--arch/x86/include/asm/thread_info.h2
-rw-r--r--arch/x86/kernel/process_64.c2
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index d1803a495b35..912e93511466 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -96,6 +96,7 @@ struct thread_info {
#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */
#define TIF_SYSCALL_TRACEPOINT 28 /* syscall tracepoint instrumentation */
#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */
+#define TIF_X32 30 /* 32-bit native x86-64 binary */
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
@@ -118,6 +119,7 @@ struct thread_info {
#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES)
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_ADDR32 (1 << TIF_ADDR32)
+#define _TIF_X32 (1 << TIF_X32)
/* work to do in syscall_trace_enter() */
#define _TIF_WORK_SYSCALL_ENTRY \
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 0e900d09e232..5fe2fbaa56ba 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -509,6 +509,7 @@ void set_personality_64bit(void)
/* Make sure to be in 64bit mode */
clear_thread_flag(TIF_IA32);
clear_thread_flag(TIF_ADDR32);
+ clear_thread_flag(TIF_X32);
/* Ensure the corresponding mm is not marked. */
if (current->mm)
@@ -528,6 +529,7 @@ void set_personality_ia32(void)
/* Make sure to be in 32bit mode */
set_thread_flag(TIF_IA32);
set_thread_flag(TIF_ADDR32);
+ clear_thread_flag(TIF_X32);
current->personality |= force_personality32;
/* Mark the associated mm as containing 32-bit tasks. */