1 #include "defs.h"
2 #include "xlat/sigaltstack_flags.h"
3
4 static void
print_stack_t(struct tcb * tcp,unsigned long addr)5 print_stack_t(struct tcb *tcp, unsigned long addr)
6 {
7 stack_t ss;
8 int r;
9
10 if (!addr) {
11 tprints("NULL");
12 return;
13 }
14
15 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
16 if (current_wordsize != sizeof(ss.ss_sp) && current_wordsize == 4) {
17 struct {
18 uint32_t ss_sp;
19 int32_t ss_flags;
20 uint32_t ss_size;
21 } ss32;
22 r = umove(tcp, addr, &ss32);
23 if (r >= 0) {
24 memset(&ss, 0, sizeof(ss));
25 ss.ss_sp = (void*)(unsigned long) ss32.ss_sp;
26 ss.ss_flags = ss32.ss_flags;
27 ss.ss_size = (unsigned long) ss32.ss_size;
28 }
29 } else
30 #endif
31 {
32 r = umove(tcp, addr, &ss);
33 }
34 if (r < 0) {
35 tprintf("%#lx", addr);
36 } else {
37 tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
38 printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
39 tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
40 }
41 }
42
SYS_FUNC(sigaltstack)43 SYS_FUNC(sigaltstack)
44 {
45 if (entering(tcp)) {
46 print_stack_t(tcp, tcp->u_arg[0]);
47 } else {
48 tprints(", ");
49 print_stack_t(tcp, tcp->u_arg[1]);
50 }
51 return 0;
52 }
53