[PATCH V10 23/28] selftests, powerpc: Add ptrace tests for TAR, PPR, DSCR in suspended TM

[Anshuman Khandual]

This patch adds ptrace interface test for TAR, PPR, DSCR
registers inside suspended TM context.

Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
---
 tools/testing/selftests/powerpc/ptrace/Makefile    |   2 +-
 .../selftests/powerpc/ptrace/ptrace-tm-spd-tar.c   | 184 +++++++++++++++++++++
 2 files changed, 185 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c

diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
index 464fa61..5703b68 100644
--- a/tools/testing/selftests/powerpc/ptrace/Makefile
+++ b/tools/testing/selftests/powerpc/ptrace/Makefile
@@ -1,5 +1,5 @@
 TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
-ptrace-tar ptrace-tm-tar
+ptrace-tar ptrace-tm-tar ptrace-tm-spd-tar
 
 all: $(TEST_PROGS)
 
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c
new file mode 100644
index 0000000..56f604b
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c
@@ -0,0 +1,184 @@
+/*
+ * Ptrace test for TAR, PPR, DSCR registers in the TM Suspend context
+ *
+ * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include "ptrace.h"
+#include "ptrace-tar.h"
+
+int shm_id;
+volatile int *cptr, *pptr;
+
+__attribute__((used)) void wait_parent(void)
+{
+	while(!cptr[1]);
+}
+
+void tm_spd_tar(void)
+{
+	unsigned long result, texasr;
+	unsigned long regs[3];
+	int ret;
+
+	cptr = (int *)shmat(shm_id, NULL, 0);
+trans:
+	asm __volatile__(
+		"li	4, %[tar_1];"
+		"mtspr %[sprn_tar],  4;"	/* TAR_1 */
+		"li	4, %[dscr_1];"
+		"mtspr %[sprn_dscr], 4;"	/* DSCR_1 */
+		"or     31,31,31;"		/* PPR_1*/
+
+		"1: ;"
+		TBEGIN
+		"beq 2f;"
+
+		"li	4, %[tar_2];"
+		"mtspr %[sprn_tar],  4;"	/* TAR_2 */
+		"li	4, %[dscr_2];"
+		"mtspr %[sprn_dscr], 4;"	/* DSCR_2 */
+		"or     1,1,1;"			/* PPR_2 */
+
+		TSUSPEND
+		"li	4, %[tar_3];"
+		"mtspr %[sprn_tar],  4;"	/* TAR_3 */
+		"li	4, %[dscr_3];"
+		"mtspr %[sprn_dscr], 4;"	/* DSCR_3 */
+		"or     6,6,6;"			/* PPR_3 */
+		"bl wait_parent;"
+		TRESUME
+
+		TEND
+		"li 0, 0;"
+		"ori %[res], 0, 0;"
+		"b 3f;"
+
+		/* Transaction abort handler */
+		"2: ;"
+		"li 0, 1;"
+		"ori %[res], 0, 0;"
+		"mfspr %[texasr], %[sprn_texasr];"
+
+		"3: ;"
+
+		:[res] "=r" (result), [texasr] "=r" (texasr)
+		:[val] "r" (cptr[1]), [sprn_dscr]"i"(SPRN_DSCR), [sprn_tar]"i"(SPRN_TAR), [sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR),
+		[tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1),
+		[tar_2]"i"(TAR_2), [dscr_2]"i"(DSCR_2),
+		[tar_3]"i"(TAR_3), [dscr_3]"i"(DSCR_3)
+		: "memory", "r0", "r1", "r3", "r4", "r5", "r6"
+		);
+
+	/* TM failed, analyse */
+	if (result) {
+		if (!cptr[0])
+			goto trans;
+
+		regs[0] = mfspr(SPRN_TAR);
+		regs[1] = mfspr(SPRN_PPR);
+		regs[2] = mfspr(SPRN_DSCR);
+
+		shmdt(&cptr);
+		printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", user_read, regs[0], regs[1], regs[2]);
+
+		ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
+		if (ret)
+			exit(1);
+		exit(0);
+	}
+	shmdt(&cptr);
+	exit(1);
+}
+
+int trace_tm_spd_tar(pid_t child)
+{
+	unsigned long regs[3];
+	int ret;
+
+	sleep(1);
+	ret = start_trace(child);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = show_tar_registers(child, regs);
+	if (ret)
+		return TEST_FAIL;
+
+	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", ptrace_read_running, regs[0], regs[1], regs[2]);
+
+	ret = validate_tar_registers(regs, TAR_3, PPR_3, DSCR_3);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = show_tm_checkpointed_state(child, regs);
+	if (ret)
+		return TEST_FAIL;
+
+	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", ptrace_read_ckpt, regs[0], regs[1], regs[2]);
+
+	ret = validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4);
+	if (ret)
+		return TEST_FAIL;
+
+	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n", ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
+
+	ret = stop_trace(child);
+	if (ret)
+		return TEST_FAIL;
+	return TEST_PASS;
+}
+
+int ptrace_tm_spd_tar(void)
+{
+	pid_t pid;
+	int ret, status;
+
+	SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM));
+	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
+	pid = fork();
+	if (pid == 0)
+		tm_spd_tar();
+
+	pptr = (int *)shmat(shm_id, NULL, 0);
+	pptr[0] = 0;
+	pptr[1] = 0;
+
+	if (pid) {
+		ret = trace_tm_spd_tar(pid);
+		if (ret) {
+			kill(pid, SIGTERM);
+			return TEST_FAIL;
+		}
+
+		pptr[0] = 1;
+		pptr[1] = 1;
+		shmdt(&pptr);
+
+		ret = wait(&status);
+		if (ret != pid) {
+			printf("Child's exit status not captured\n");
+			return TEST_FAIL;
+		}
+
+		if (WIFEXITED(status)) {
+			if(WEXITSTATUS(status))
+				return TEST_FAIL;
+		}
+		return TEST_PASS;
+	}
+	return TEST_PASS;
+}
+
+int main(int argc, char *argv[])
+{
+	return test_harness(ptrace_tm_spd_tar, "ptrace_tm_spd_tar");
+}
-- 
2.1.0