From 609355dfc88e2921bfcbd879300d482a9a33378e Mon Sep 17 00:00:00 2001 From: "Christopher M. Riedl" Date: Fri, 26 Feb 2021 19:12:51 -0600 Subject: powerpc/signal: Add unsafe_copy_{vsx, fpr}_from_user() Reuse the "safe" implementation from signal.c but call unsafe_get_user() directly in a loop to avoid the intermediate copy into a local buffer. Signed-off-by: Christopher M. Riedl Reviewed-by: Daniel Axtens Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210227011259.11992-3-cmr@codefail.de --- arch/powerpc/kernel/signal.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'arch/powerpc/kernel/signal.h') diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h index 2559a681536e..d8dd76b1dc94 100644 --- a/arch/powerpc/kernel/signal.h +++ b/arch/powerpc/kernel/signal.h @@ -53,6 +53,26 @@ 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 *buf = (u64 __user *)from; \ + int i; \ + \ + for (i = 0; i < ELF_NFPREG - 1; i++) \ + unsafe_get_user(__t->thread.TS_FPR(i), &buf[i], label); \ + unsafe_get_user(__t->thread.fp_state.fpscr, &buf[i], label); \ +} while (0) + +#define unsafe_copy_vsx_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *buf = (u64 __user *)from; \ + int i; \ + \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + unsafe_get_user(__t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET], \ + &buf[i], label); \ +} while (0) + #ifdef CONFIG_PPC_TRANSACTIONAL_MEM #define unsafe_copy_ckfpr_to_user(to, task, label) do { \ struct task_struct *__t = task; \ @@ -80,6 +100,10 @@ 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 +139,8 @@ 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) { -- cgit