selftests/powerpc: Check that signals always get delivered

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

5 files changed, 285 insertions, 0 deletions

diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index 1cc6d64c39b7..db54a33f850f 100644
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile
@@ -19,6 +19,7 @@ SUB_DIRS = alignment		\
            dscr                 \
            mm                   \
            pmu                  \
+           signal               \
            primitives           \
            stringloops          \
            switch_endian        \
diff --git a/tools/testing/selftests/powerpc/signal/Makefile b/tools/testing/selftests/powerpc/signal/Makefile
new file mode 100644
index 000000000000..f0eef27458e2
--- /dev/null
+++ b/tools/testing/selftests/powerpc/signal/Makefile
@@ -0,0 +1,13 @@
+TEST_PROGS := signal signal_tm
+
+all: $(TEST_PROGS)
+
+$(TEST_PROGS): ../harness.c ../utils.c signal.S
+
+CFLAGS += -maltivec
+signal_tm: CFLAGS += -mhtm
+
+include ../../lib.mk
+
+clean:
+        rm -f $(TEST_PROGS) *.o
diff --git a/tools/testing/selftests/powerpc/signal/signal.S b/tools/testing/selftests/powerpc/signal/signal.S
new file mode 100644
index 000000000000..7043d521df0a
--- /dev/null
+++ b/tools/testing/selftests/powerpc/signal/signal.S
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2015, Cyril Bur, IBM Corp.
+ *
+ * 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 "../basic_asm.h"
+
+/* long signal_self(pid_t pid, int sig); */
+FUNC_START(signal_self)
+        li      r0,37 /* sys_kill */
+        /* r3 already has our pid in it */
+        /* r4 already has signal type in it */
+        sc
+        bc      4,3,1f
+        subfze  r3,r3
+1:      blr
+FUNC_END(signal_self)
+
+/* long tm_signal_self(pid_t pid, int sig, int *ret); */
+FUNC_START(tm_signal_self)
+        PUSH_BASIC_STACK(8)
+        std     r5,STACK_FRAME_PARAM(0)(sp) /* ret */
+        tbegin.
+        beq     1f
+        tsuspend.
+        li      r0,37 /* sys_kill */
+        /* r3 already has our pid in it */
+        /* r4 already has signal type in it */
+        sc
+        ld      r5,STACK_FRAME_PARAM(0)(sp) /* ret */
+        bc      4,3,2f
+        subfze  r3,r3
+2:      std     r3,0(r5)
+        tabort. 0
+        tresume. /* Be nice to some cleanup, jumps back to tbegin then to 1: */
+        /*
+         * Transaction should be proper doomed and we should never get
+         * here
+         */
+        li      r3,1
+        POP_BASIC_STACK(8)
+        blr
+1:      li      r3,0
+        POP_BASIC_STACK(8)
+        blr
+FUNC_END(tm_signal_self)
diff --git a/tools/testing/selftests/powerpc/signal/signal.c b/tools/testing/selftests/powerpc/signal/signal.c
new file mode 100644
index 000000000000..e7dedd28b3c2
--- /dev/null
+++ b/tools/testing/selftests/powerpc/signal/signal.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2016, Cyril Bur, IBM Corp.
+ *
+ * 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.
+ *
+ * Sending one self a signal should always get delivered.
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <altivec.h>
+
+#include "utils.h"
+
+#define MAX_ATTEMPT 500000
+#define TIMEOUT 5
+
+extern long signal_self(pid_t pid, int sig);
+
+static sig_atomic_t signaled;
+static sig_atomic_t fail;
+
+static void signal_handler(int sig)
+{
+        if (sig == SIGUSR1)
+                signaled = 1;
+        else
+                fail = 1;
+}
+
+static int test_signal()
+{
+        int i;
+        struct sigaction act;
+        pid_t ppid = getpid();
+        pid_t pid;
+
+        act.sa_handler = signal_handler;
+        act.sa_flags = 0;
+        sigemptyset(&act.sa_mask);
+        if (sigaction(SIGUSR1, &act, NULL) < 0) {
+                perror("sigaction SIGUSR1");
+                exit(1);
+        }
+        if (sigaction(SIGALRM, &act, NULL) < 0) {
+                perror("sigaction SIGALRM");
+                exit(1);
+        }
+
+        /* Don't do this for MAX_ATTEMPT, its simply too long */
+        for(i  = 0; i < 1000; i++) {
+                pid = fork();
+                if (pid == -1) {
+                        perror("fork");
+                        exit(1);
+                }
+                if (pid == 0) {
+                        signal_self(ppid, SIGUSR1);
+                        exit(1);
+                } else {
+                        alarm(0); /* Disable any pending */
+                        alarm(2);
+                        while (!signaled && !fail)
+                                asm volatile("": : :"memory");
+                        if (!signaled) {
+                                fprintf(stderr, "Didn't get signal from child\n");
+                                FAIL_IF(1); /* For the line number */
+                        }
+                        /* Otherwise we'll loop too fast and fork() will eventually fail */
+                        waitpid(pid, NULL, 0);
+                }
+        }
+
+        for (i = 0; i < MAX_ATTEMPT; i++) {
+                long rc;
+
+                alarm(0); /* Disable any pending */
+                signaled = 0;
+                alarm(TIMEOUT);
+                rc = signal_self(ppid, SIGUSR1);
+                if (rc) {
+                        fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx",
+                                        i, fail, rc);
+                        FAIL_IF(1); /* For the line number */
+                }
+                while (!signaled && !fail)
+                        asm volatile("": : :"memory");
+                if (!signaled) {
+                        fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx",
+                                        i, fail, rc);
+                        FAIL_IF(1); /* For the line number */
+                }
+        }
+
+        return 0;
+}
+
+int main(void)
+{
+        test_harness_set_timeout(300);
+        return test_harness(test_signal, "signal");
+}
diff --git a/tools/testing/selftests/powerpc/signal/signal_tm.c b/tools/testing/selftests/powerpc/signal/signal_tm.c
new file mode 100644
index 000000000000..2e7451a37cc6
--- /dev/nul