From: Yury Norov ynorov@caviumnetworks.com
hulk inclusion category: feature bugzilla: NA CVE: NA ---------------------------
ILP32 tasks are needed to be distinguished from LP64 and AARCH32. This patch adds helper functions is_ilp32_compat_{task,thread} and thread flag TIF_32BIT_AARCH64 to address it. This is a preparation for following patches in ILP32 patchset.
For consistency, SET_PERSONALITY is changed here accordingly.
Signed-off-by: Andrew Pinski Andrew.Pinski@caviumnetworks.com Signed-off-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com Signed-off-by: Christoph Muellner christoph.muellner@theobroma-systems.com Signed-off-by: Yury Norov ynorov@caviumnetworks.com Reviewed-by: David Daney ddaney@caviumnetworks.com Signed-off-by: Xiongfeng Wang wangxiongfeng2@huawei.com Reviewed-by: Hanjun Guo <guohanjun@huawei.com mailto:guohanjun@huawei.com> Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/arm64/include/asm/elf.h | 2 ++ arch/arm64/include/asm/is_compat.h | 30 ++++++++++++++++++++++++++-- arch/arm64/include/asm/thread_info.h | 2 ++ 3 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 9b4823ec81430..04b70fe745f48 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -146,6 +146,7 @@ typedef struct user_fpsimd_state elf_fpregset_t;
#define SET_PERSONALITY(ex) \ ({ \ + clear_thread_flag(TIF_32BIT_AARCH64); \ clear_thread_flag(TIF_32BIT); \ current->personality &= ~READ_IMPLIES_EXEC; \ }) @@ -207,6 +208,7 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; */ #define COMPAT_SET_PERSONALITY(ex) \ ({ \ + clear_thread_flag(TIF_32BIT_AARCH64); \ set_thread_flag(TIF_32BIT); \ }) #define COMPAT_ARCH_DLINFO diff --git a/arch/arm64/include/asm/is_compat.h b/arch/arm64/include/asm/is_compat.h index 19868588fbef3..484c01def030c 100644 --- a/arch/arm64/include/asm/is_compat.h +++ b/arch/arm64/include/asm/is_compat.h @@ -33,18 +33,44 @@ static inline int is_a32_compat_thread(struct thread_info *thread)
#endif /* CONFIG_AARCH32_EL0 */
+#ifdef CONFIG_ARM64_ILP32 + +static inline int is_ilp32_compat_task(void) +{ + return test_thread_flag(TIF_32BIT_AARCH64); +} + +static inline int is_ilp32_compat_thread(struct thread_info *thread) +{ + return test_ti_thread_flag(thread, TIF_32BIT_AARCH64); +} + +#else + +static inline int is_ilp32_compat_task(void) +{ + return 0; +} + +static inline int is_ilp32_compat_thread(struct thread_info *thread) +{ + return 0; +} + +#endif /* CONFIG_ARM64_ILP32 */ + #ifdef CONFIG_COMPAT
static inline int is_compat_task(void) { - return is_a32_compat_task(); + return is_a32_compat_task() || is_ilp32_compat_task(); }
#endif /* CONFIG_COMPAT */
static inline int is_compat_thread(struct thread_info *thread) { - return is_a32_compat_thread(thread); + return is_a32_compat_thread(thread) || is_ilp32_compat_thread(thread); }
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index 534f97a63edd0..30c2bdea970ff 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -90,6 +90,7 @@ void arch_release_task_struct(struct task_struct *tsk); #define TIF_SVE 23 /* Scalable Vector Extension in use */ #define TIF_SVE_VL_INHERIT 24 /* Inherit sve_vl_onexec across exec */ #define TIF_SSBD 25 /* Wants SSB mitigation */ +#define TIF_32BIT_AARCH64 26 /* 32 bit process on AArch64(ILP32) */
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) @@ -106,6 +107,7 @@ void arch_release_task_struct(struct task_struct *tsk); #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) #define _TIF_32BIT (1 << TIF_32BIT) #define _TIF_SVE (1 << TIF_SVE) +#define _TIF_32BIT_AARCH64 (1 << TIF_32BIT_AARCH64)
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \