[RT ARM] Avoid Linux include with a redefinition
To avoid depending on kernel headers, we just repeat the single define
we need, which is likely never going to change.
Patch by Joakim Sindholt
@@ -82,10 +82,6 @@ uintptr_t GetCurrentProcess(void);
#endif
#endif
-#if defined(__linux__) && defined(__arm__)
- #include <asm/unistd.h>
-#endif
-
/*
* The compiler generates calls to __clear_cache() when creating
* trampoline functions on the stack for use with nested functions.
@@ -108,6 +104,15 @@ void __clear_cache(void *start, void *end) {
sysarch(ARM_SYNC_ICACHE, &arg);
#elif defined(__linux__)
+ /*
+ * We used to include asm/unistd.h for the __ARM_NR_cacheflush define, but
+ * it also brought many other unused defines, as well as a dependency on
+ * kernel headers to be installed.
+ *
+ * This value is stable at least since Linux 3.13 and should remain so for
+ * compatibility reasons, warranting it's re-definition here.
+ */
+ #define __ARM_NR_cacheflush 0x0f0002
register int start_reg __asm("r0") = (int) (intptr_t) start;
const register int end_reg __asm("r1") = (int) (intptr_t) end;
const register int flags __asm("r2") = 0;
