1 files changed, 61 insertions, 0 deletions
diff --git a/arch/parisc/kernel/perf_regs.c b/arch/parisc/kernel/perf_regs.c
new file mode 100644
index 000000000000..68458e2f6197
--- /dev/null
+++ b/arch/parisc/kernel/perf_regs.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (C) 2025 by Helge Deller <deller@gmx.de> */
+
+#include <linux/perf_event.h>
+#include <linux/perf_regs.h>
+#include <asm/ptrace.h>
+
+u64 perf_reg_value(struct pt_regs *regs, int idx)
+{
+	switch (idx) {
+	case PERF_REG_PARISC_R0 ... PERF_REG_PARISC_R31:
+		return regs->gr[idx - PERF_REG_PARISC_R0];
+	case PERF_REG_PARISC_SR0 ... PERF_REG_PARISC_SR7:
+		return regs->sr[idx - PERF_REG_PARISC_SR0];
+	case PERF_REG_PARISC_IASQ0 ... PERF_REG_PARISC_IASQ1:
+		return regs->iasq[idx - PERF_REG_PARISC_IASQ0];
+	case PERF_REG_PARISC_IAOQ0 ... PERF_REG_PARISC_IAOQ1:
+		return regs->iasq[idx - PERF_REG_PARISC_IAOQ0];
+	case PERF_REG_PARISC_SAR:	/* CR11 */
+		return regs->sar;
+	case PERF_REG_PARISC_IIR:	/* CR19 */
+		return regs->iir;
+	case PERF_REG_PARISC_ISR:	/* CR20 */
+		return regs->isr;
+	case PERF_REG_PARISC_IOR:	/* CR21 */
+		return regs->ior;
+	case PERF_REG_PARISC_IPSW:	/* CR22 */
+		return regs->ipsw;
+	};
+	WARN_ON_ONCE((u32)idx >= PERF_REG_PARISC_MAX);
+	return 0;
+}
+
+#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))
+
+int perf_reg_validate(u64 mask)
+{
+	if (!mask || mask & REG_RESERVED)
+		return -EINVAL;
+
+	return 0;
+}
+
+u64 perf_reg_abi(struct task_struct *task)
+{
+	if (!IS_ENABLED(CONFIG_64BIT))
+		return PERF_SAMPLE_REGS_ABI_32;
+
+	if (test_tsk_thread_flag(task, TIF_32BIT))
+		return PERF_SAMPLE_REGS_ABI_32;
+
+	return PERF_SAMPLE_REGS_ABI_64;
+}
+
+void perf_get_regs_user(struct perf_regs *regs_user,
+			struct pt_regs *regs)
+{
+	regs_user->regs = task_pt_regs(current);
+	regs_user->abi = perf_reg_abi(current);
+}