sys/arch/arm/include/setjmp.h

   1 /*      $NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt 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    (dependent on creator)
  18  *      13      fpscr           vfp status control register
  19  *      14      r4              register 4
  20  *      15      r5              register 5
  21  *      16      r6              register 6
  22  *      17      r7              register 7
  23  *      18      r8              register 8
  24  *      19      r9              register 9
  25  *      20      r10             register 10 (sl)
  26  *      21      r11             register 11 (fp)
  27  *      22      r12             register 12 (ip)
  28  *      23      r13             register 13 (sp)
  29  *      24      r14             register 14 (lr)
  30  *      25      signal mask     (dependent on magic)
  31  *      26      (con't)
  32  *      27      (con't)
  33  *      28      (con't)
  34  *      32-33   d8              (vfp register d8)
  35  *      34-35   d9              (vfp register d9)
  36  *      36-37   d10             (vfp register d10)
  37  *      38-39   d11             (vfp register d11)
  38  *      40-41   d12             (vfp register d12)
  39  *      42-43   d13             (vfp register d13)
  40  *      44-45   d14             (vfp register d14)
  41  *      46-47   d15             (vfp register d15)
  42  *
  43  * The magic number number identifies the jmp_buf and
  44  * how the buffer was created as well as providing
  45  * a sanity check
  46  *
  47  * A side note I should mention - Please do not tamper
  48  * with the floating point fields. While they are
  49  * always saved and restored at the moment this cannot
  50  * be garenteed especially if the compiler happens
  51  * to be generating soft-float code so no fp
  52  * registers will be used.
  53  *
  54  * Whilst this can be seen an encouraging people to
  55  * use the setjmp buffer in this way I think that it
  56  * is for the best then if changes occur compiles will
  57  * break rather than just having new builds falling over
  58  * mysteriously.
  59  */
  60
  61 #define _JB_MAGIC__SETJMP       0x4278f500
  62 #define _JB_MAGIC_SETJMP        0x4278f501
  63 #define _JB_MAGIC__SETJMP_VFP   0x4278f502
  64 #define _JB_MAGIC_SETJMP_VFP    0x4278f503
  65
  66 /* Valid for all jmp_buf's */
  67
  68 #define _JB_MAGIC                0
  69 #define _JB_REG_FPSCR           13
  70 #define _JB_REG_R4              14
  71 #define _JB_REG_R5              15
  72 #define _JB_REG_R6              16
  73 #define _JB_REG_R7              17
  74 #define _JB_REG_R8              18
  75 #define _JB_REG_R9              19
  76 #define _JB_REG_R10             20
  77 #define _JB_REG_R11             21
  78 #define _JB_REG_R12             22
  79 #define _JB_REG_R13             23
  80 #define _JB_REG_R14             24
  81
  82 /* Only valid with the _JB_MAGIC_SETJMP magic */
  83
  84 #define _JB_SIGMASK             25
  85
  86 #define _JB_REG_D8              32
  87 #define _JB_REG_D9              34
  88 #define _JB_REG_D10             36
  89 #define _JB_REG_D11             38
  90 #define _JB_REG_D12             40
  91 #define _JB_REG_D13             42
  92 #define _JB_REG_D14             44
  93 #define _JB_REG_D15             46