diff options
| author | Pratyush Anand <panand@redhat.com> | 2016-11-02 14:40:45 +0530 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-07 18:15:21 +0000 |
| commit | 06beb72fbe23e348cc423dd9310c6fc02cd7c7da (patch) | |
| tree | 50e79c6f7ebc74763a284ca35b3275547de6a12e | |
| parent | 53d07e21854de064d9625853b8303357482b25b1 (diff) | |
| download | blackbird-op-linux-06beb72fbe23e348cc423dd9310c6fc02cd7c7da.tar.gz blackbird-op-linux-06beb72fbe23e348cc423dd9310c6fc02cd7c7da.zip | |
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>
| -rw-r--r-- | arch/arm64/include/asm/elf.h | 12 | ||||
| -rw-r--r-- | 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 a81454ad5455..47619411f0ff 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; /* |
