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-rw-r--r--tools/testing/selftests/powerpc/ptrace/ptrace-gpr.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.S b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.S
new file mode 100644
index 000000000..070e8443e
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-gpr.S
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * test helper assembly functions
+ *
+ * Copyright (C) 2016 Simon Guo, IBM Corporation.
+ * Copyright 2022 Michael Ellerman, IBM Corporation.
+ */
+#include "basic_asm.h"
+
+#define GPR_SIZE __SIZEOF_LONG__
+#define FIRST_GPR 14
+#define NUM_GPRS (32 - FIRST_GPR)
+#define STACK_SIZE (NUM_GPRS * GPR_SIZE)
+
+// gpr_child_loop(int *read_flag, int *write_flag,
+// unsigned long *gpr_buf, double *fpr_buf);
+FUNC_START(gpr_child_loop)
+ // r3 = read_flag
+ // r4 = write_flag
+ // r5 = gpr_buf
+ // r6 = fpr_buf
+ PUSH_BASIC_STACK(STACK_SIZE)
+
+ // Save non-volatile GPRs
+ OP_REGS PPC_STL, GPR_SIZE, FIRST_GPR, 31, %r1, STACK_FRAME_LOCAL(0, 0), FIRST_GPR
+
+ // Load GPRs with expected values
+ OP_REGS PPC_LL, GPR_SIZE, FIRST_GPR, 31, r5, 0, FIRST_GPR
+
+ // Load FPRs with expected values
+ OP_REGS lfd, 8, 0, 31, r6
+
+ // Signal to parent that we're ready
+ li r0, 1
+ stw r0, 0(r4)
+
+ // Wait for parent to finish
+1: lwz r0, 0(r3)
+ cmpwi r0, 0
+ beq 1b // Loop while flag is zero
+
+ // Save GPRs back to caller buffer
+ OP_REGS PPC_STL, GPR_SIZE, FIRST_GPR, 31, r5, 0, FIRST_GPR
+
+ // Save FPRs
+ OP_REGS stfd, 8, 0, 31, r6
+
+ // Reload non-volatile GPRs
+ OP_REGS PPC_LL, GPR_SIZE, FIRST_GPR, 31, %r1, STACK_FRAME_LOCAL(0, 0), FIRST_GPR
+
+ POP_BASIC_STACK(STACK_SIZE)
+ blr