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arm64: introduce mm context flag to keep 32 bit task information 

We need to decide in some cases like uprobe instruction analysis that
whether the current mm context belongs to a 32 bit task or 64 bit.

This patch has introduced an unsigned flag variable in mm_context_t.
Currently, we set and clear TIF_32BIT depending on the condition that
whether an elf binary load sets personality for 32 bit or 64 bit
respectively.

Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Pratyush Anand 2016-11-02 14:40:45 +05:30 committed by Catalin Marinas
parent 53d07e2185
commit 06beb72fbe
2 changed files with 11 additions and 2 deletions
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12
arch/arm64/include/asm/elf.h
View File

@ -138,7 +138,11 @@ typedef struct user_fpsimd_state elf_fpregset_t;
*/
#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
#define SET_PERSONALITY(ex) clear_thread_flag(TIF_32BIT);
#define SET_PERSONALITY(ex) \
({ \
clear_bit(TIF_32BIT, &current->mm->context.flags); \
clear_thread_flag(TIF_32BIT); \
})
/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
#define ARCH_DLINFO \
@ -183,7 +187,11 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
((x)->e_flags & EF_ARM_EABI_MASK))
#define compat_start_thread compat_start_thread
#define COMPAT_SET_PERSONALITY(ex) set_thread_flag(TIF_32BIT);
#define COMPAT_SET_PERSONALITY(ex) \
({ \
set_bit(TIF_32BIT, &current->mm->context.flags); \
set_thread_flag(TIF_32BIT); \
})
#define COMPAT_ARCH_DLINFO
extern int aarch32_setup_vectors_page(struct linux_binprm *bprm,
int uses_interp);

1
arch/arm64/include/asm/mmu.h
View File

@ -19,6 +19,7 @@
typedef struct {
atomic64_t id;
void *vdso;
unsigned long flags;
} mm_context_t;
/*