granicus.if.org Git - strace/blob - sigaltstack.c

   1 #include "defs.h"
   2 #include "xlat/sigaltstack_flags.h"
   3
   4 static void
   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
  43 int
  44 sys_sigaltstack(struct tcb *tcp)
  45 {
  46         if (entering(tcp)) {
  47                 print_stack_t(tcp, tcp->u_arg[0]);
  48         } else {
  49                 tprints(", ");
  50                 print_stack_t(tcp, tcp->u_arg[1]);
  51         }
  52         return 0;
  53 }