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Commit bb212724 authored by H. Peter Anvin's avatar H. Peter Anvin
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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: default avatarH. Peter Anvin <hpa@zytor.com>
parent d046ff8b

arch/x86/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -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	\

arch/x86/kernel/process_64.c

+2 −0
Original line number Diff line number Diff line
@@ -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. */