inkletblot/plan9port
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

16-byte align

Browse Source
This commit is contained in:
rsc 2006-04-22 00:50:08 +00:00
parent d9ed72433f
commit fa07e3d777
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/libthread/Darwin-386.c
View File

@ -3,10 +3,19 @@
void
makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
{
int n;
int *sp;
sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
sp -= argc;
/*
* Stack pointer at call instruction (before return address
* gets pushed) must be 16-byte aligned.
*/
if((uintptr)sp%4)
abort();
while((uintptr)sp%16)
sp--;
memmove(sp, &argc+1, argc*sizeof(int));
*--sp = 0; /* return address */
ucp->uc_mcontext.mc_eip = (long)func;