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

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