diff options
Diffstat (limited to 'src/libthread/Darwin-x86_64-swapcontext.c')
| -rw-r--r-- | src/libthread/Darwin-x86_64-swapcontext.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/libthread/Darwin-x86_64-swapcontext.c b/src/libthread/Darwin-x86_64-swapcontext.c index 27931456..c29ddb5e 100644 --- a/src/libthread/Darwin-x86_64-swapcontext.c +++ b/src/libthread/Darwin-x86_64-swapcontext.c @@ -16,6 +16,14 @@ makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...) va_end(arg); sp = (uintptr*)((char*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size); + /* + * Stack pointer at call instruction (before return address + * gets pushed) must be 16-byte aligned. + */ + if((uintptr)sp%4) + abort(); + while((uintptr)sp%16 != 0) + sp--; *--sp = 0; // fn's return address *--sp = (uintptr)fn; // return address of setcontext uc->mc.sp = (uintptr)sp; |