[PATCH v11 17/27] selftests/powerpc: Add ptrace tests for GPR/FPR registers in TM

[wei . guo . simon]

From: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>

This patch adds ptrace interface test for GPR/FPR registers
inside TM context. This adds ptrace interface based helper
functions related to checkpointed GPR/FPR access.

Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxx>
Cc: Cyril Bur <cyrilbur@xxxxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Cc: Simon Guo <wei.guo.simon@xxxxxxxxx>
Cc: Ulrich Weigand <ulrich.weigand@xxxxxxxxxx>
Cc: Michael Neuling <mikey@xxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Rashmica Gupta <rashmicy@xxxxxxxxx>
Cc: Khem Raj <raj.khem@xxxxxxxxx>
Cc: Jessica Yu <jeyu@xxxxxxxxxx>
Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Miroslav Benes <mbenes@xxxxxxx>
Cc: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx>
Cc: Chris Smart <chris@xxxxxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Simon Guo <wei.guo.simon@xxxxxxxxx>
---
 tools/testing/selftests/powerpc/ptrace/Makefile    |   3 +-
 .../selftests/powerpc/ptrace/ptrace-tm-gpr.c       | 296 +++++++++++++++++++++
 2 files changed, 298 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tm-gpr.c

diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
index 31e8e33..170683a 100644
--- a/tools/testing/selftests/powerpc/ptrace/Makefile
+++ b/tools/testing/selftests/powerpc/ptrace/Makefile
@@ -1,8 +1,9 @@
-TEST_PROGS := ptrace-ebb ptrace-gpr
+TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr
 
 all: $(TEST_PROGS)
 CFLAGS += -m64
 $(TEST_PROGS): ../harness.c ptrace.S ../utils.c ptrace.h
 ptrace-ebb: ../pmu/event.c ../pmu/lib.c ../pmu/ebb/ebb_handler.S ../pmu/ebb/busy_loop.S
+
 clean:
 	rm -f $(TEST_PROGS) *.o
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-gpr.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-gpr.c
new file mode 100644
index 0000000..0329457
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-gpr.c
@@ -0,0 +1,296 @@
+/*
+ * Ptrace test for GPR/FPR registers in TM 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-gpr.h"
+
+/* Tracer and Tracee Shared Data */
+int shm_id;
+volatile unsigned long *cptr, *pptr;
+
+void store_gpr(unsigned long *addr);
+void store_fpr(float *addr);
+
+float a = FPR_1;
+float b = FPR_2;
+float c = FPR_3;
+
+void tm_gpr(void)
+{
+	unsigned long gpr_buf[18];
+	unsigned long result, texasr;
+	float fpr_buf[32];
+
+	printf("Starting the child\n");
+	cptr = (unsigned long *)shmat(shm_id, NULL, 0);
+
+trans:
+	cptr[1] = 0;
+	asm __volatile__(
+
+		"li 14, %[gpr_1];"
+		"li 15, %[gpr_1];"
+		"li 16, %[gpr_1];"
+		"li 17, %[gpr_1];"
+		"li 18, %[gpr_1];"
+		"li 19, %[gpr_1];"
+		"li 20, %[gpr_1];"
+		"li 21, %[gpr_1];"
+		"li 22, %[gpr_1];"
+		"li 23, %[gpr_1];"
+		"li 24, %[gpr_1];"
+		"li 25, %[gpr_1];"
+		"li 26, %[gpr_1];"
+		"li 27, %[gpr_1];"
+		"li 28, %[gpr_1];"
+		"li 29, %[gpr_1];"
+		"li 30, %[gpr_1];"
+		"li 31, %[gpr_1];"
+
+		"lfs 0, 0(%[flt_1]);"
+		"lfs 1, 0(%[flt_1]);"
+		"lfs 2, 0(%[flt_1]);"
+		"lfs 3, 0(%[flt_1]);"
+		"lfs 4, 0(%[flt_1]);"
+		"lfs 5, 0(%[flt_1]);"
+		"lfs 6, 0(%[flt_1]);"
+		"lfs 7, 0(%[flt_1]);"
+		"lfs 8, 0(%[flt_1]);"
+		"lfs 9, 0(%[flt_1]);"
+		"lfs 10, 0(%[flt_1]);"
+		"lfs 11, 0(%[flt_1]);"
+		"lfs 12, 0(%[flt_1]);"
+		"lfs 13, 0(%[flt_1]);"
+		"lfs 14, 0(%[flt_1]);"
+		"lfs 15, 0(%[flt_1]);"
+		"lfs 16, 0(%[flt_1]);"
+		"lfs 17, 0(%[flt_1]);"
+		"lfs 18, 0(%[flt_1]);"
+		"lfs 19, 0(%[flt_1]);"
+		"lfs 20, 0(%[flt_1]);"
+		"lfs 21, 0(%[flt_1]);"
+		"lfs 22, 0(%[flt_1]);"
+		"lfs 23, 0(%[flt_1]);"
+		"lfs 24, 0(%[flt_1]);"
+		"lfs 25, 0(%[flt_1]);"
+		"lfs 26, 0(%[flt_1]);"
+		"lfs 27, 0(%[flt_1]);"
+		"lfs 28, 0(%[flt_1]);"
+		"lfs 29, 0(%[flt_1]);"
+		"lfs 30, 0(%[flt_1]);"
+		"lfs 31, 0(%[flt_1]);"
+
+		"1: ;"
+		TBEGIN
+		"beq 2f;"
+
+		"li 14, %[gpr_2];"
+		"li 15, %[gpr_2];"
+		"li 16, %[gpr_2];"
+		"li 17, %[gpr_2];"
+		"li 18, %[gpr_2];"
+		"li 19, %[gpr_2];"
+		"li 20, %[gpr_2];"
+		"li 21, %[gpr_2];"
+		"li 22, %[gpr_2];"
+		"li 23, %[gpr_2];"
+		"li 24, %[gpr_2];"
+		"li 25, %[gpr_2];"
+		"li 26, %[gpr_2];"
+		"li 27, %[gpr_2];"
+		"li 28, %[gpr_2];"
+		"li 29, %[gpr_2];"
+		"li 30, %[gpr_2];"
+		"li 31, %[gpr_2];"
+
+
+		"lfs 0, 0(%[flt_2]);"
+		"lfs 1, 0(%[flt_2]);"
+		"lfs 2, 0(%[flt_2]);"
+		"lfs 3, 0(%[flt_2]);"
+		"lfs 4, 0(%[flt_2]);"
+		"lfs 5, 0(%[flt_2]);"
+		"lfs 6, 0(%[flt_2]);"
+		"lfs 7, 0(%[flt_2]);"
+		"lfs 8, 0(%[flt_2]);"
+		"lfs 9, 0(%[flt_2]);"
+		"lfs 10, 0(%[flt_2]);"
+		"lfs 11, 0(%[flt_2]);"
+		"lfs 12, 0(%[flt_2]);"
+		"lfs 13, 0(%[flt_2]);"
+		"lfs 14, 0(%[flt_2]);"
+		"lfs 15, 0(%[flt_2]);"
+		"lfs 16, 0(%[flt_2]);"
+		"lfs 17, 0(%[flt_2]);"
+		"lfs 18, 0(%[flt_2]);"
+		"lfs 19, 0(%[flt_2]);"
+		"lfs 20, 0(%[flt_2]);"
+		"lfs 21, 0(%[flt_2]);"
+		"lfs 22, 0(%[flt_2]);"
+		"lfs 23, 0(%[flt_2]);"
+		"lfs 24, 0(%[flt_2]);"
+		"lfs 25, 0(%[flt_2]);"
+		"lfs 26, 0(%[flt_2]);"
+		"lfs 27, 0(%[flt_2]);"
+		"lfs 28, 0(%[flt_2]);"
+		"lfs 29, 0(%[flt_2]);"
+		"lfs 30, 0(%[flt_2]);"
+		"lfs 31, 0(%[flt_2]);"
+		TSUSPEND
+		"li 7, 1;"
+		"stw 7, 0(%[cptr1]);"
+		TRESUME
+		"b .;"
+
+		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)
+		: [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
+		[sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "r" (&a),
+		[flt_2] "r" (&b), [cptr1] "r" (&cptr[1])
+		: "memory", "r7", "r8", "r9", "r10",
+		"r11", "r12", "r13", "r14", "r15", "r16",
+		"r17", "r18", "r19", "r20", "r21", "r22",
+		"r23", "r24", "r25", "r26", "r27", "r28",
+		"r29", "r30", "r31"
+		);
+
+	if (result) {
+		if (!cptr[0])
+			goto trans;
+
+		store_gpr(gpr_buf);
+		store_fpr(fpr_buf);
+
+		if (validate_gpr(gpr_buf, GPR_3))
+			exit(1);
+
+		if (validate_fpr_float(fpr_buf, c))
+			exit(1);
+
+		exit(0);
+	}
+	exit(1);
+}
+
+int trace_tm_gpr(pid_t child)
+{
+	unsigned long gpr[18];
+	unsigned long fpr[32];
+	int ret;
+
+	ret = start_trace(child);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = show_gpr(child, gpr);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = validate_gpr(gpr, GPR_2);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = show_fpr(child, fpr);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = validate_fpr(fpr, FPR_2_REP);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = show_ckpt_fpr(child, fpr);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = validate_fpr(fpr, FPR_1_REP);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = show_ckpt_gpr(child, gpr);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = validate_gpr(gpr, GPR_1);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = write_ckpt_gpr(child, GPR_3);
+	if (ret)
+		return TEST_FAIL;
+
+	ret = write_ckpt_fpr(child, FPR_3_REP);
+	if (ret)
+		return TEST_FAIL;
+
+	pptr[0] = 1;
+	ret = stop_trace(child);
+	if (ret)
+		return TEST_FAIL;
+
+	return TEST_PASS;
+}
+
+int ptrace_tm_gpr(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) {
+		perror("fork() failed");
+		return TEST_FAIL;
+	}
+	if (pid == 0)
+		tm_gpr();
+
+	if (pid) {
+		pptr = (unsigned long *)shmat(shm_id, NULL, 0);
+
+		while (!pptr[1]);
+		ret = trace_tm_gpr(pid);
+		if (ret) {
+			kill(pid, SIGTERM);
+			return TEST_FAIL;
+		}
+
+		shmdt((void *)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_gpr, "ptrace_tm_gpr");
+}
-- 
1.8.3.1