Messages in this thread Patch in this message | | | From | Pratyush Anand <> | Subject | [PATCH V2 5/6] arm64: introduce mm context flag to keep 32 bit task information | Date | Tue, 27 Sep 2016 13:17:59 +0530 |
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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> --- arch/arm64/include/asm/elf.h | 12 ++++++++++-- arch/arm64/include/asm/mmu.h | 1 + 2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index a55384f4a5d7..5d1700425efe 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -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, ¤t->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, ¤t->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); diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 8d9fce037b2f..d4fa21543771 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -19,6 +19,7 @@ typedef struct { atomic64_t id; void *vdso; + unsigned long flags; } mm_context_t; /* -- 2.7.4
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