sys/arch/arm/include/setjmp.h

   1 /*      $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
   2
   3 /*
   4  * machine/setjmp.h: machine dependent setjmp-related information.
   5  */
   6
   7 #define _JBLEN  64              /* size, in longs, of a jmp_buf */
   8
   9 /*
  10  * NOTE: The internal structure of a jmp_buf is *PRIVATE*
  11  *       This information is provided as there is software
  12  *       that fiddles with this with obtain the stack pointer
  13  *       (yes really ! and its commercial !).
  14  *
  15  * Description of the setjmp buffer
  16  *
  17  * word  0      magic number    (dependant on creator)
  18  *       1 -  3 f4              fp register 4
  19  *       4 -  6 f5              fp register 5
  20  *       7 -  9 f6              fp register 6
  21  *      10 - 12 f7              fp register 7
  22  *      13      fpsr            fp status register
  23  *      14      r4              register 4
  24  *      15      r5              register 5
  25  *      16      r6              register 6
  26  *      17      r7              register 7
  27  *      18      r8              register 8
  28  *      19      r9              register 9
  29  *      20      r10             register 10 (sl)
  30  *      21      r11             register 11 (fp)
  31  *      22      r12             register 12 (ip)
  32  *      23      r13             register 13 (sp)
  33  *      24      r14             register 14 (lr)
  34  *      25      signal mask     (dependant on magic)
  35  *      26      (con't)
  36  *      27      (con't)
  37  *      28      (con't)
  38  *
  39  * The magic number number identifies the jmp_buf and
  40  * how the buffer was created as well as providing
  41  * a sanity check
  42  *
  43  * A side note I should mention - Please do not tamper
  44  * with the floating point fields. While they are
  45  * always saved and restored at the moment this cannot
  46  * be garenteed especially if the compiler happens
  47  * to be generating soft-float code so no fp
  48  * registers will be used.
  49  *
  50  * Whilst this can be seen an encouraging people to
  51  * use the setjmp buffer in this way I think that it
  52  * is for the best then if changes occur compiles will
  53  * break rather than just having new builds falling over
  54  * mysteriously.
  55  */
  56
  57 #define _JB_MAGIC__SETJMP       0x4278f500
  58 #define _JB_MAGIC_SETJMP        0x4278f501
  59
  60 /* Valid for all jmp_buf's */
  61
  62 #define _JB_MAGIC                0
  63 #define _JB_REG_F4               1
  64 #define _JB_REG_F5               4
  65 #define _JB_REG_F6               7
  66 #define _JB_REG_F7              10
  67 #define _JB_REG_FPSR            13
  68 #define _JB_REG_R4              14
  69 #define _JB_REG_R5              15
  70 #define _JB_REG_R6              16
  71 #define _JB_REG_R7              17
  72 #define _JB_REG_R8              18
  73 #define _JB_REG_R9              19
  74 #define _JB_REG_R10             20
  75 #define _JB_REG_R11             21
  76 #define _JB_REG_R12             22
  77 #define _JB_REG_R13             23
  78 #define _JB_REG_R14             24
  79
  80 /* Only valid with the _JB_MAGIC_SETJMP magic */
  81
  82 #define _JB_SIGMASK             25