Commit bb212724 authored by H. Peter Anvin's avatar H. Peter Anvin

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
......@@ -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 \
......
......@@ -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. */
......
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