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x32: Add a thread flag for x32 processes

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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>
This commit is contained in:
H. Peter Anvin
2012-02-14 13:56:49 -08:00
parent d046ff8b30
commit bb2127240c
2 changed files with 4 additions and 0 deletions
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2
arch/x86/kernel/process_64.c
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@@ -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. */