1*12b1df16SDavid du Colombier #include "../plan9/lib.h"
2*12b1df16SDavid du Colombier #include "../plan9/sys9.h"
3*12b1df16SDavid du Colombier #include <signal.h>
4*12b1df16SDavid du Colombier #include <setjmp.h>
5*12b1df16SDavid du Colombier
6*12b1df16SDavid du Colombier /* A stack to hold pcs when signals nest */
7*12b1df16SDavid du Colombier #define MAXSIGSTACK 20
8*12b1df16SDavid du Colombier typedef struct Pcstack Pcstack;
9*12b1df16SDavid du Colombier static struct Pcstack {
10*12b1df16SDavid du Colombier int sig;
11*12b1df16SDavid du Colombier void (*hdlr)(int, char*, Ureg*);
12*12b1df16SDavid du Colombier unsigned long restorepc;
13*12b1df16SDavid du Colombier Ureg *u;
14*12b1df16SDavid du Colombier } pcstack[MAXSIGSTACK];
15*12b1df16SDavid du Colombier static int nstack = 0;
16*12b1df16SDavid du Colombier
17*12b1df16SDavid du Colombier static void notecont(Ureg*, char*);
18*12b1df16SDavid du Colombier
19*12b1df16SDavid du Colombier void
_notetramp(int sig,void (* hdlr)(int,char *,Ureg *),Ureg * u)20*12b1df16SDavid du Colombier _notetramp(int sig, void (*hdlr)(int, char*, Ureg*), Ureg *u)
21*12b1df16SDavid du Colombier {
22*12b1df16SDavid du Colombier Pcstack *p;
23*12b1df16SDavid du Colombier
24*12b1df16SDavid du Colombier if(nstack >= MAXSIGSTACK)
25*12b1df16SDavid du Colombier _NOTED(1); /* nesting too deep; just do system default */
26*12b1df16SDavid du Colombier p = &pcstack[nstack];
27*12b1df16SDavid du Colombier p->restorepc = u->pc;
28*12b1df16SDavid du Colombier p->sig = sig;
29*12b1df16SDavid du Colombier p->hdlr = hdlr;
30*12b1df16SDavid du Colombier p->u = u;
31*12b1df16SDavid du Colombier nstack++;
32*12b1df16SDavid du Colombier u->pc = (unsigned long) notecont;
33*12b1df16SDavid du Colombier _NOTED(2); /* NSAVE: clear note but hold state */
34*12b1df16SDavid du Colombier }
35*12b1df16SDavid du Colombier
36*12b1df16SDavid du Colombier static void
notecont(Ureg * u,char * s)37*12b1df16SDavid du Colombier notecont(Ureg *u, char *s)
38*12b1df16SDavid du Colombier {
39*12b1df16SDavid du Colombier Pcstack *p;
40*12b1df16SDavid du Colombier void(*f)(int, char*, Ureg*);
41*12b1df16SDavid du Colombier
42*12b1df16SDavid du Colombier p = &pcstack[nstack-1];
43*12b1df16SDavid du Colombier f = p->hdlr;
44*12b1df16SDavid du Colombier u->pc = p->restorepc;
45*12b1df16SDavid du Colombier nstack--;
46*12b1df16SDavid du Colombier (*f)(p->sig, s, u);
47*12b1df16SDavid du Colombier _NOTED(3); /* NRSTR */
48*12b1df16SDavid du Colombier }
49*12b1df16SDavid du Colombier
50*12b1df16SDavid du Colombier #define JMPBUFPC 1
51*12b1df16SDavid du Colombier #define JMPBUFSP 0
52*12b1df16SDavid du Colombier
53*12b1df16SDavid du Colombier extern sigset_t _psigblocked;
54*12b1df16SDavid du Colombier
55*12b1df16SDavid du Colombier void
siglongjmp(sigjmp_buf j,int ret)56*12b1df16SDavid du Colombier siglongjmp(sigjmp_buf j, int ret)
57*12b1df16SDavid du Colombier {
58*12b1df16SDavid du Colombier struct Ureg *u;
59*12b1df16SDavid du Colombier
60*12b1df16SDavid du Colombier if(j[0])
61*12b1df16SDavid du Colombier _psigblocked = j[1];
62*12b1df16SDavid du Colombier if(nstack == 0 || pcstack[nstack-1].u->sp > j[2+JMPBUFSP])
63*12b1df16SDavid du Colombier longjmp(j+2, ret);
64*12b1df16SDavid du Colombier u = pcstack[nstack-1].u;
65*12b1df16SDavid du Colombier nstack--;
66*12b1df16SDavid du Colombier u->r1 = ret;
67*12b1df16SDavid du Colombier if(ret == 0)
68*12b1df16SDavid du Colombier u->r1 = 1;
69*12b1df16SDavid du Colombier u->pc = j[2+JMPBUFPC];
70*12b1df16SDavid du Colombier u->sp = j[2+JMPBUFSP];
71*12b1df16SDavid du Colombier _NOTED(3); /* NRSTR */
72*12b1df16SDavid du Colombier }
73