selftests/powerpc: Add ptrace tests for GPR/FPR registers in suspended TM

This patch adds ptrace interface test for GPR/FPR registers
inside suspended TM context.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tools/testing/selftests/powerpc/ptrace/.gitignore

@@ -1,2 +1,3 @@
 ptrace-gpr
-ptrace-tm-gpr
+ptrace-tm-gpr
+ptrace-tm-spd-gpr

tools/testing/selftests/powerpc/ptrace/Makefile

@@ -1,4 +1,4 @@
-TEST_PROGS := ptrace-gpr ptrace-tm-gpr
+TEST_PROGS := ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr
 
 include ../../lib.mk
 

tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-gpr.c

@@ -0,0 +1,169 @@
+/*
+ * Ptrace test for GPR/FPR registers in 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-gpr.h"
+#include "tm.h"
+
+/* Tracer and Tracee Shared Data */
+int shm_id;
+int *cptr, *pptr;
+
+float a = FPR_1;
+float b = FPR_2;
+float c = FPR_3;
+float d = FPR_4;
+
+__attribute__((used)) void wait_parent(void)
+{
+	cptr[2] = 1;
+	while (!cptr[1])
+		asm volatile("" : : : "memory");
+}
+
+void tm_spd_gpr(void)
+{
+	unsigned long gpr_buf[18];
+	unsigned long result, texasr;
+	float fpr_buf[32];
+
+	cptr = (int *)shmat(shm_id, NULL, 0);
+
+trans:
+	cptr[2] = 0;
+	asm __volatile__(
+		ASM_LOAD_GPR_IMMED(gpr_1)
+		ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
+
+		"1: ;"
+		"tbegin.;"
+		"beq 2f;"
+
+		ASM_LOAD_GPR_IMMED(gpr_2)
+		"tsuspend.;"
+		ASM_LOAD_GPR_IMMED(gpr_4)
+		ASM_LOAD_FPR_SINGLE_PRECISION(flt_4)
+
+		"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)
+		: [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), [gpr_4]"i"(GPR_4),
+		[sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "r" (&a),
+		[flt_2] "r" (&b), [flt_4] "r" (&d)
+		: "memory", "r5", "r6", "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;
+
+		shmdt((void *)cptr);
+		store_gpr(gpr_buf);
+		store_fpr_single_precision(fpr_buf);
+
+		if (validate_gpr(gpr_buf, GPR_3))
+			exit(1);
+
+		if (validate_fpr_float(fpr_buf, c))
+			exit(1);
+		exit(0);
+	}
+	shmdt((void *)cptr);
+	exit(1);
+}
+
+int trace_tm_spd_gpr(pid_t child)
+{
+	unsigned long gpr[18];
+	unsigned long fpr[32];
+
+	FAIL_IF(start_trace(child));
+	FAIL_IF(show_gpr(child, gpr));
+	FAIL_IF(validate_gpr(gpr, GPR_4));
+	FAIL_IF(show_fpr(child, fpr));
+	FAIL_IF(validate_fpr(fpr, FPR_4_REP));
+	FAIL_IF(show_ckpt_fpr(child, fpr));
+	FAIL_IF(validate_fpr(fpr, FPR_1_REP));
+	FAIL_IF(show_ckpt_gpr(child, gpr));
+	FAIL_IF(validate_gpr(gpr, GPR_1));
+	FAIL_IF(write_ckpt_gpr(child, GPR_3));
+	FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
+
+	pptr[0] = 1;
+	pptr[1] = 1;
+	FAIL_IF(stop_trace(child));
+	return TEST_PASS;
+}
+
+int ptrace_tm_spd_gpr(void)
+{
+	pid_t pid;
+	int ret, status;
+
+	SKIP_IF(!have_htm());
+	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
+	pid = fork();
+	if (pid < 0) {
+		perror("fork() failed");
+		return TEST_FAIL;
+	}
+
+	if (pid == 0)
+		tm_spd_gpr();
+
+	if (pid) {
+		pptr = (int *)shmat(shm_id, NULL, 0);
+		pptr[0] = 0;
+		pptr[1] = 0;
+
+		while (!pptr[2])
+			asm volatile("" : : : "memory");
+		ret = trace_tm_spd_gpr(pid);
+		if (ret) {
+			kill(pid, SIGTERM);
+			shmdt((void *)pptr);
+			shmctl(shm_id, IPC_RMID, NULL);
+			return TEST_FAIL;
+		}
+
+		shmdt((void *)pptr);
+
+		ret = wait(&status);
+		shmctl(shm_id, IPC_RMID, NULL);
+		if (ret != pid) {
+			printf("Child's exit status not captured\n");
+			return TEST_FAIL;
+		}
+
+		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
+			TEST_PASS;
+	}
+	return TEST_PASS;
+}
+
+int main(int argc, char *argv[])
+{
+	return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
+}