sim: syscall: add getpid support

Hoist the Blackfin implementation up to the common one.

sim/bfin/ChangeLog

@@ -1,3 +1,7 @@
+2021-04-18  Mike Frysinger  <vapier@gentoo.org>
+
+	* interp.c (bfin_syscall): Delete CB_SYS_getpid handling.
+
 2021-04-12  Mike Frysinger  <vapier@gentoo.org>
 
 	* interp.c (sim_open): Delete 3rd arg to sim_cpu_alloc_all.

sim/bfin/interp.c

@@ -457,10 +457,6 @@ bfin_syscall (SIM_CPU *cpu)
       sc.result = setgid (sc.arg1);
       goto sys_finish;
 
-    case CB_SYS_getpid:
-      tbuf += sprintf (tbuf, "getpid()");
-      sc.result = getpid ();
-      goto sys_finish;
     case CB_SYS_kill:
       tbuf += sprintf (tbuf, "kill(%u, %i)", args[0], args[1]);
       /* Only let the app kill itself.  */

sim/common/ChangeLog

@@ -1,3 +1,7 @@
+2021-04-18  Mike Frysinger  <vapier@gentoo.org>
+
+	* syscall.c (cb_syscall): Implement CB_SYS_getpid.
+
 2021-04-15  John Baldwin  <jhb@FreeBSD.org>
 
 	* Make-common.in (CONFIG_CFLAGS): Remove SIM_EXTRA_CFLAGS.

sim/common/syscall.c

@@ -578,6 +578,10 @@ cb_syscall (host_callback *cb, CB_SYSCALL *sc)
       }
       break;
 
+    case CB_SYS_getpid:
+      result = getpid ();
+      break;
+
     case CB_SYS_time :
       {
 	/* FIXME: May wish to change CB_SYS_time to something else.

sim/testsuite/bfin/ChangeLog

@@ -1,3 +1,7 @@
+2021-04-18  Mike Frysinger  <vapier@gentoo.org>
+
+	* getpid.c: New test.
+
 2021-04-08  Mike Frysinger  <vapier@gentoo.org>
 
 	* allinsn.exp (arch): Delete.

sim/testsuite/bfin/getpid.c

@@ -0,0 +1,18 @@
+/* Basic getpid tests.
+# mach: bfin
+# cc: -msim
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+  pid_t pid = getpid();
+  if (pid < 0) {
+    perror("getpid failed");
+    return 1;
+  }
+  puts("pass");
+  return 0;
+}