[PATCH v4 02/10] powerpc/signal: Add unsafe_copy_{vsx, fpr}_from_user()
flat view
STALE2090d
SUPERSEDED
From: Christopher M. Riedl <hidden>
Date: 2021-01-28 04:13:45
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Status: Superseded by v7 (posted 2021-02-27). [go to v7]
Revision v4 (7 revisions archived).
Revisions (7)
Reuse the "safe" implementation from signal.c except for calling unsafe_copy_from_user() to copy into a local buffer. Signed-off-by: Christopher M. Riedl <redacted> --- arch/powerpc/kernel/signal.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index 2559a681536e..c18402d625f1 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h@@ -53,6 +53,33 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); &buf[i], label);\ } while (0) +#define unsafe_copy_fpr_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *__f = (u64 __user *)from; \ + u64 buf[ELF_NFPREG]; \ + int i; \ + \ + unsafe_copy_from_user(buf, __f, ELF_NFPREG * sizeof(double), \ + label); \ + for (i = 0; i < ELF_NFPREG - 1; i++) \ + __t->thread.TS_FPR(i) = buf[i]; \ + __t->thread.fp_state.fpscr = buf[i]; \ +} while (0) + +#define unsafe_copy_vsx_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *__f = (u64 __user *)from; \ + u64 buf[ELF_NVSRHALFREG]; \ + int i; \ + \ + unsafe_copy_from_user(buf, __f, \ + ELF_NVSRHALFREG * sizeof(double), \ + label); \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + __t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; \ +} while (0) + + #ifdef CONFIG_PPC_TRANSACTIONAL_MEM #define unsafe_copy_ckfpr_to_user(to, task, label) do { \ struct task_struct *__t = task; \
@@ -80,6 +107,10 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); unsafe_copy_to_user(to, (task)->thread.fp_state.fpr, \ ELF_NFPREG * sizeof(double), label) +#define unsafe_copy_fpr_from_user(task, from, label) \ + unsafe_copy_from_user((task)->thread.fp_state.fpr, from, \ + ELF_NFPREG * sizeof(double), label) + static inline unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) {
@@ -115,6 +146,8 @@ copy_ckfpr_from_user(struct task_struct *task, void __user *from) #else #define unsafe_copy_fpr_to_user(to, task, label) do { } while (0) +#define unsafe_copy_fpr_from_user(task, from, label) do { } while (0) + static inline unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) {
--
2.26.1