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

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.

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>

3 files changed, 162 insertions, 3 deletions

diff --git a/tools/testing/selftests/powerpc/ptrace/.gitignore b/tools/testing/selftests/powerpc/ptrace/.gitignore
index 6e060041d7c8..4756bcdddc8a 100644
--- a/tools/testing/selftests/powerpc/ptrace/.gitignore
+++ b/tools/testing/selftests/powerpc/ptrace/.gitignore
@@ -1 +1,2 @@
-ptrace-gpr
\ No newline at end of file
+ptrace-gpr
+ptrace-tm-gpr
\ No newline at end of file
diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
index 110377268f6d..84f5de9a1b13 100644
--- a/tools/testing/selftests/powerpc/ptrace/Makefile
+++ b/tools/testing/selftests/powerpc/ptrace/Makefile
@@ -1,10 +1,10 @@
-TEST_PROGS := ptrace-gpr
+TEST_PROGS := ptrace-gpr ptrace-tm-gpr
 
 include ../../lib.mk
 
 all: $(TEST_PROGS)
 
-CFLAGS += -m64 -I../../../../../usr/include
+CFLAGS += -m64 -I../../../../../usr/include -I../tm -mhtm
 
 $(TEST_PROGS): ../harness.c ../utils.c ../lib/reg.S ptrace.h
 
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 000000000000..59206b96e98a
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-gpr.c
@@ -0,0 +1,158 @@
+/*
+ * 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"
+#include "tm.h"
+
+/* Tracer and Tracee Shared Data */
+int shm_id;
+unsigned long *cptr, *pptr;
+
+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__(
+                ASM_LOAD_GPR_IMMED(gpr_1)
+                ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
+                "1: ;"
+                "tbegin.;"
+                "beq 2f;"
+                ASM_LOAD_GPR_IMMED(gpr_2)
+                ASM_LOAD_FPR_SINGLE_PRECISION(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;
+
+                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_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_2));
+        FAIL_IF(show_fpr(child, fpr));
+        FAIL_IF(validate_fpr(fpr, FPR_2_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;
+        FAIL_IF(stop_trace(child));
+
+        return TEST_PASS;
+}
+
+int ptrace_tm_gpr(void)
+{
+        pid_t pid;
+        int ret, status;
+
+        SKIP_IF(!have_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])
+                        asm volatile("" : : : "memory");
+                ret = trace_tm_gpr(pid);
+                if (ret) {
+                        kill(pid, SIGTERM);
+                        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_gpr, "ptrace_tm_gpr");
+}