print_pc: fix multiple personalities support

* syscall.c (print_pc): Choose instruction pointer format depending
on current_wordsize, not the size of long integer type.
* tests/pc.c: New file.
* tests/pc.test: New test.
* tests/Makefile.am (check_PROGRAMS): Add pc.
(TESTS): Add pc.test.
* tests/.gitignore: Add pc.

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/pc.c b/tests/pc.c
new file mode 100644
index 000000000..909a2ef1a
--- /dev/null
+++ b/tests/pc.c
@@ -0,0 +1,35 @@
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+
+int main(void)
+{
+	const unsigned long size = sysconf(_SC_PAGESIZE);
+	const unsigned long mask = ~(size - 1);
+
+	/* write instruction pointer length to the log */
+	if (write(-1, NULL, 2 * sizeof(void *)) >= 0)
+		return 77;
+	/* just a noticeable line in the log */
+	if (munmap(&munmap, 0) >= 0)
+		return 77;
+
+	int pid = fork();
+	if (pid < 0)
+		return 77;
+
+	if (!pid) {
+		munmap((void *) ((unsigned long) &munmap & mask), size);
+		/* SIGSEGV is expected */
+		munmap((void *) (((unsigned long) &munmap & mask) + size), size);
+		return 77;
+	}
+
+	int status;
+	if (wait(&status) != pid ||
+	    !WIFSIGNALED(status) ||
+	    WTERMSIG(status) != SIGSEGV)
+		return 77;
+
+	return 0;
+}