Merge branch 'new-gcc-qemu-fix' into 'master'

Fixed compilation issues on the latest GCC and QEMU.

See merge request !10

3 files changed, 28 insertions, 4 deletions

diff --git a/src/Make.config b/src/Make.config
index 69914d8..f6e3ccf 100644
--- a/src/Make.config
+++ b/src/Make.config
@@ -48,7 +48,7 @@ WARNINGS = -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wsystem-headers
 # klaar36@ida 2015-03: -fno-omit-frame-pointer to get working backtrace
 # klaar36@ida 2016-05: -ffreestanding to assert freestanding environment
 # klaar36@ida 2016-05: -fno-inline to ease debugging
-CFLAGS = -std=gnu99 -ggdb -msoft-float -fno-omit-frame-pointer -ffreestanding -fno-inline -O $(CFLAG_STACK_PROTECTOR)
+CFLAGS = -std=gnu99 -ggdb -msoft-float -fno-omit-frame-pointer -ffreestanding -fno-inline -fno-pic -O $(CFLAG_STACK_PROTECTOR)
 CPPFLAGS = -nostdinc -I$(SRCDIR) -I$(SRCDIR)/lib
 ASFLAGS = -Wa,--gstabs
 LDFLAGS = 
diff --git a/src/threads/init.c b/src/threads/init.c
index 16be95d..ee05db1 100644
--- a/src/threads/init.c
+++ b/src/threads/init.c
@@ -410,10 +410,16 @@ hard_power_off (void)
      ACPI shutdown should use:
      outw(PM1a_CNT, SLP_TYPa | SLP_EN );
      Gathering of the corect values for the parameters is not easy.
-     This works for QEMU and Bochs. It's not portable.
+     This works for QEMU and Bochs. It's not portable (and does not work in the latest QEMU).
   */
   outw(0xB004, 0x2000);
 
+  /* Even more recent versions of QEMU needs other measures for shutdown.
+   * See: https://wiki.osdev.org/Shutdown
+   * Exit code is the value to outb * 2 + 1, so we can not exit cleanly...
+   */
+  outb(0xF4, 0x30);
+
   /* This is APM Shutdown */
   for (p = s; *p != '\0'; p++)
     outb (0x8900, *p);
diff --git a/src/utils/pintos b/src/utils/pintos
index e96bc22..2d1d7f0 100755
--- a/src/utils/pintos
+++ b/src/utils/pintos
@@ -484,10 +484,13 @@ sub run_qemu {
     my (@cmd) = ('qemu-system-i386'); # klaar@ida 2015-02-13
 
     for my $iface (0...3) {
+	# filst@ida 2018-04-18:
+	# Use -drive file=<file>,index=<index>,format=raw to avoid warnings on newer Qemu
 	my ($option) = ('-hda', '-hdb', '-hdc', '-hdd')[$iface];
-	push (@cmd, $option, $disks_by_iface[$iface]{FILE_NAME})
+	push (@cmd, '-drive', "file=" . $disks_by_iface[$iface]{FILE_NAME} . ",index=$iface,format=raw")
 	  if defined $disks_by_iface[$iface]{FILE_NAME};
     }
+
     # klaar@ida 2015-03-18:
     # '-p' is not supported on modern qemu
     # '-s' is default for '-gdb tcp:1234' on modern qemu
@@ -504,7 +507,22 @@ sub run_qemu {
 #    push (@cmd, '-s', '-S') if $debug eq 'gdb'; # replaced by above
     push (@cmd, '-monitor', 'null') if $vga eq 'none' && $debug eq 'none';
     push (@cmd, '-nographic') if $vga eq 'none';
-    run_command (@cmd);
+
+    # Insert a device that lets us shutdown Pintos. See https://wiki.osdev.org/Shutdown for details
+    push (@cmd, '-device', 'isa-debug-exit,iobase=0xf4,iosize=0x04');
+
+    # When using isa-debug-exit, we can not exit QEMU cleanly. We exit with 0x30, which will make QEMU exit
+    # with the code 0x30*2 + 1 = 97, and therefore we treat 97 as success as well.
+    my ($exit) = xsystem (@cmd);
+    if (WIFEXITED($exit)) {
+	$exit = WEXITSTATUS($exit);
+	if ($exit == 97) {
+	    # We use this code to exit cleanly from within Pintos (see https://wiki.osdev.org/Shutdown)
+	    # since we can not exit with code 0 using the debug shutdown device in QEMU.
+	    $exit = 0;
+	}
+    }
+    die "command failed\n" if $exit;
 }
 
 # player_unsup($flag)