linux/arch/ppc/xmon/setjmp.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

29 lines
525 B
C

/*
* Copyright (C) 1996 Paul Mackerras.
*
* NB this file must be compiled with -O2.
*/
int
xmon_setjmp(long *buf)
{
asm ("mflr 0; stw 0,0(%0);"
"stw 1,4(%0); stw 2,8(%0);"
"mfcr 0; stw 0,12(%0);"
"stmw 13,16(%0)"
: : "r" (buf));
/* XXX should save fp regs as well */
return 0;
}
void
xmon_longjmp(long *buf, int val)
{
if (val == 0)
val = 1;
asm ("lmw 13,16(%0);"
"lwz 0,12(%0); mtcrf 0x38,0;"
"lwz 0,0(%0); lwz 1,4(%0); lwz 2,8(%0);"
"mtlr 0; mr 3,%1"
: : "r" (buf), "r" (val));
}