diff options
Diffstat (limited to 'arch/powerpc/kernel/ptrace/ptrace-novsx.c')
-rw-r--r-- | arch/powerpc/kernel/ptrace/ptrace-novsx.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace/ptrace-novsx.c b/arch/powerpc/kernel/ptrace/ptrace-novsx.c new file mode 100644 index 0000000000..7433f3db97 --- /dev/null +++ b/arch/powerpc/kernel/ptrace/ptrace-novsx.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <linux/regset.h> + +#include <asm/switch_to.h> + +#include "ptrace-decl.h" + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last checkpointed + * value of all FPR registers for the current transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + * }; + */ +int fpr_get(struct task_struct *target, const struct user_regset *regset, + struct membuf to) +{ +#ifdef CONFIG_PPC_FPU_REGS + BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) != + offsetof(struct thread_fp_state, fpr[32])); + + flush_fp_to_thread(target); + + return membuf_write(&to, &target->thread.fp_state, 33 * sizeof(u64)); +#else + return membuf_write(&to, &empty_zero_page, 33 * sizeof(u64)); +#endif +} + +/* + * Regardless of transactions, 'fp_state' holds the current running + * value of all FPR registers and 'ckfp_state' holds the last checkpointed + * value of all FPR registers for the current transaction. + * + * Userspace interface buffer layout: + * + * struct data { + * u64 fpr[32]; + * u64 fpscr; + * }; + * + */ +int fpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ +#ifdef CONFIG_PPC_FPU_REGS + BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) != + offsetof(struct thread_fp_state, fpr[32])); + + flush_fp_to_thread(target); + + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &target->thread.fp_state, 0, -1); +#else + return 0; +#endif +} |