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typedef struct ucontext ucontext_t;
struct ucontext
{
ulong pc; /* lr */
ulong cr; /* mfcr */
ulong ctr; /* mfcr */
ulong xer; /* mfcr */
ulong sp; /* callee saved: r1 */
ulong toc; /* callee saved: r2 */
ulong r3; /* first arg to function, return register: r3 */
ulong gpr[19]; /* callee saved: r13-r31 */
// XXX: currently do not save vector registers or floating-point state
// ulong pad;
// uvlong fpr[18]; /* callee saved: f14-f31 */
// ulong vr[4*12]; /* callee saved: v20-v31, 256-bits each */
};
void makecontext(ucontext_t*, void(*)(void), int, ...);
void getcontext(ucontext_t*);
int setcontext(ucontext_t*);
int swapcontext(ucontext_t*, ucontext_t*);
int __setlabel(ucontext_t*);
void __gotolabel(ucontext_t*);
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