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

   1 #include "defs.h"
   2
   3 #include "xlat/kexec_load_flags.h"
   4 #include "xlat/kexec_arch_values.h"
   5
   6 #ifndef KEXEC_ARCH_MASK
   7 # define KEXEC_ARCH_MASK 0xffff0000
   8 #endif
   9 #ifndef KEXEC_SEGMENT_MAX
  10 # define KEXEC_SEGMENT_MAX 16
  11 #endif
  12
  13 static void
  14 print_seg(const unsigned long *seg)
  15 {
  16         tprints("{");
  17         printaddr(seg[0]);
  18         tprintf(", %lu, ", seg[1]);
  19         printaddr(seg[2]);
  20         tprintf(", %lu}", seg[3]);
  21 }
  22
  23 static void
  24 print_kexec_segments(struct tcb *tcp, const unsigned long addr,
  25                      const unsigned long len)
  26 {
  27         unsigned long seg[4];
  28         const size_t sizeof_seg = ARRAY_SIZE(seg) * current_wordsize;
  29         unsigned int i;
  30
  31         if (!len) {
  32                 tprints("[]");
  33                 return;
  34         }
  35
  36         if (len > KEXEC_SEGMENT_MAX) {
  37                 printaddr(addr);
  38                 return;
  39         }
  40
  41         if (umove_ulong_array_or_printaddr(tcp, addr, seg, ARRAY_SIZE(seg)))
  42                 return;
  43
  44         tprints("[");
  45         print_seg(seg);
  46
  47         for (i = 1; i < len; ++i) {
  48                 tprints(", ");
  49                 if (umove_ulong_array_or_printaddr(tcp,
  50                                                    addr + i * sizeof_seg,
  51                                                    seg, ARRAY_SIZE(seg)))
  52                         break;
  53                 print_seg(seg);
  54         }
  55
  56         tprints("]");
  57 }
  58
  59 SYS_FUNC(kexec_load)
  60 {
  61         unsigned long n;
  62
  63         /* entry, nr_segments */
  64         printaddr(tcp->u_arg[0]);
  65         tprintf(", %lu, ", tcp->u_arg[1]);
  66
  67         /* segments */
  68         print_kexec_segments(tcp, tcp->u_arg[2], tcp->u_arg[1]);
  69         tprints(", ");
  70
  71         /* flags */
  72         n = tcp->u_arg[3];
  73         printxval(kexec_arch_values, n & KEXEC_ARCH_MASK, "KEXEC_ARCH_???");
  74         n &= ~KEXEC_ARCH_MASK;
  75         if (n) {
  76                 tprints("|");
  77                 printflags(kexec_load_flags, n, "KEXEC_???");
  78         }
  79
  80         return RVAL_DECODED;
  81 }
  82
  83 #include "xlat/kexec_file_load_flags.h"
  84
  85 SYS_FUNC(kexec_file_load)
  86 {
  87         /* kernel_fd */
  88         printfd(tcp, tcp->u_arg[0]);
  89         tprints(", ");
  90         /* initrd_fd */
  91         printfd(tcp, tcp->u_arg[1]);
  92         tprints(", ");
  93         /* cmdline_len */
  94         tprintf("%lu, ", tcp->u_arg[2]);
  95         /* cmdline */
  96         printstr(tcp, tcp->u_arg[3], tcp->u_arg[2]);
  97         tprints(", ");
  98         /* flags */
  99         printflags(kexec_file_load_flags, tcp->u_arg[4], "KEXEC_FILE_???");
 100
 101         return RVAL_DECODED;
 102 }