From: H. Peter Anvin Date: Tue, 14 Feb 2012 21:56:49 +0000 (-0800) Subject: x32: Add a thread flag for x32 processes X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=bb2127240c5595ae4ef7115494f51e973692f64e;p=deliverable%2Flinux.git 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 --- 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. */