Add need_hop_back() call that determines if stack_hop_back is needed

Also, use need_hop_back() instead of on_extra_stack() in code that
determines whether or not to call stack_hop_back().

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/stacks.h b/src/stacks.h
index 9d3422f0..265b4047 100644
--- a/src/stacks.h
+++ b/src/stacks.h
@@ -9,6 +9,7 @@ u32 call32(void *func, u32 eax, u32 errret);
 extern u8 ExtraStack[], *StackPos;
 u32 stack_hop(u32 eax, u32 edx, void *func);
 u32 stack_hop_back(u32 eax, u32 edx, void *func);
+int on_extra_stack(void);
 struct bregs;
 inline void farcall16(struct bregs *callregs);
 inline void farcall16big(struct bregs *callregs);
@@ -35,4 +36,13 @@ int wait_preempt(void);
 void check_preempt(void);
 u32 call32_params(void *func, u32 eax, u32 edx, u32 ecx, u32 errret);
 
+// Inline functions
+
+// Check if a call to stack_hop_back is needed.
+static inline int
+need_hop_back(void)
+{
+    return on_extra_stack();
+}
+
 #endif // stacks.h