It's not valid to pass a pointer to a stack variable through the stack_hop() call (because the call changes the stack segment). This bug was probably not noticed before because by default (CONFIG_ENTRY_EXTRASTACK) SeaBIOS uses the extra stack on all 16bit entry points, and the internal stack_hop() with that config option is effectively a no-op.
This reverts commit d488a7683d90bf8fae7ceb8c3ad9e95fbbd92079.
Signed-off-by: Kevin O'Connor kevin@koconnor.net --- src/kbd.c | 6 +++--- src/mouse.c | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/src/kbd.c b/src/kbd.c index 3677a12..a5a1ad9 100644 --- a/src/kbd.c +++ b/src/kbd.c @@ -11,7 +11,7 @@ #include "hw/ps2port.h" // ps2_kbd_command #include "hw/usb-hid.h" // usb_kbd_command #include "output.h" // debug_enter -#include "stacks.h" // stack_hop +#include "stacks.h" // yield #include "string.h" // memset #include "util.h" // kbd_init
@@ -117,8 +117,8 @@ static int kbd_command(int command, u8 *param) { if (usb_kbd_active()) - return stack_hop(command, (u32)param, usb_kbd_command); - return stack_hop(command, (u32)param, ps2_kbd_command); + return usb_kbd_command(command, param); + return ps2_kbd_command(command, param); }
// read keyboard input diff --git a/src/mouse.c b/src/mouse.c index 83e499d..6d1f5b7 100644 --- a/src/mouse.c +++ b/src/mouse.c @@ -10,7 +10,7 @@ #include "hw/ps2port.h" // ps2_mouse_command #include "hw/usb-hid.h" // usb_mouse_command #include "output.h" // dprintf -#include "stacks.h" // stack_hop +#include "stacks.h" // stack_hop_back #include "util.h" // mouse_init
void @@ -27,8 +27,8 @@ static int mouse_command(int command, u8 *param) { if (usb_mouse_active()) - return stack_hop(command, (u32)param, usb_mouse_command); - return stack_hop(command, (u32)param, ps2_mouse_command); + return usb_mouse_command(command, param); + return ps2_mouse_command(command, param); }
#define RET_SUCCESS 0x00