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-rw-r--r--arch/powerpc/kernel/ptrace/ptrace-fpu.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace/ptrace-fpu.c b/arch/powerpc/kernel/ptrace/ptrace-fpu.c
new file mode 100644
index 000000000..09c49632b
--- /dev/null
+++ b/arch/powerpc/kernel/ptrace/ptrace-fpu.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/regset.h>
+
+#include <asm/switch_to.h>
+
+#include "ptrace-decl.h"
+
+int ptrace_get_fpr(struct task_struct *child, int index, unsigned long *data)
+{
+#ifdef CONFIG_PPC_FPU_REGS
+ unsigned int fpidx = index - PT_FPR0;
+#endif
+
+ if (index > PT_FPSCR)
+ return -EIO;
+
+#ifdef CONFIG_PPC_FPU_REGS
+ flush_fp_to_thread(child);
+ if (fpidx < (PT_FPSCR - PT_FPR0)) {
+ if (IS_ENABLED(CONFIG_PPC32))
+ // On 32-bit the index we are passed refers to 32-bit words
+ *data = ((u32 *)child->thread.fp_state.fpr)[fpidx];
+ else
+ memcpy(data, &child->thread.TS_FPR(fpidx), sizeof(long));
+ } else
+ *data = child->thread.fp_state.fpscr;
+#else
+ *data = 0;
+#endif
+
+ return 0;
+}
+
+int ptrace_put_fpr(struct task_struct *child, int index, unsigned long data)
+{
+#ifdef CONFIG_PPC_FPU_REGS
+ unsigned int fpidx = index - PT_FPR0;
+#endif
+
+ if (index > PT_FPSCR)
+ return -EIO;
+
+#ifdef CONFIG_PPC_FPU_REGS
+ flush_fp_to_thread(child);
+ if (fpidx < (PT_FPSCR - PT_FPR0)) {
+ if (IS_ENABLED(CONFIG_PPC32))
+ // On 32-bit the index we are passed refers to 32-bit words
+ ((u32 *)child->thread.fp_state.fpr)[fpidx] = data;
+ else
+ memcpy(&child->thread.TS_FPR(fpidx), &data, sizeof(long));
+ } else
+ child->thread.fp_state.fpscr = data;
+#endif
+
+ return 0;
+}
+