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Annotation of sys/arch/arm/include/setjmp.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: setjmp.h,v 1.1 2004/02/01 05:09:49 drahn Exp $        */
                      2: /*     $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
                      3:
                      4: /*
                      5:  * machine/setjmp.h: machine dependent setjmp-related information.
                      6:  */
                      7:
                      8: #ifdef __ELF__
                      9: #define        _JBLEN  64              /* size, in longs, of a jmp_buf */
                     10: #else
                     11: #define        _JBLEN  29              /* size, in longs, of a jmp_buf */
                     12: #endif
                     13:
                     14: /*
                     15:  * NOTE: The internal structure of a jmp_buf is *PRIVATE*
                     16:  *       This information is provided as there is software
                     17:  *       that fiddles with this with obtain the stack pointer
                     18:  *      (yes really ! and its commercial !).
                     19:  *
                     20:  * Description of the setjmp buffer
                     21:  *
                     22:  * word  0     magic number    (dependant on creator)
                     23:  *       1 -  3        f4              fp register 4
                     24:  *      4 -  6 f5              fp register 5
                     25:  *      7 -  9 f6              fp register 6
                     26:  *     10 - 12 f7              fp register 7
                     27:  *     13      fpsr            fp status register
                     28:  *     14      r4              register 4
                     29:  *     15      r5              register 5
                     30:  *     16      r6              register 6
                     31:  *     17      r7              register 7
                     32:  *     18      r8              register 8
                     33:  *     19      r9              register 9
                     34:  *     20      r10             register 10 (sl)
                     35:  *     21      r11             register 11 (fp)
                     36:  *     22      r12             register 12 (ip)
                     37:  *     23      r13             register 13 (sp)
                     38:  *     24      r14             register 14 (lr)
                     39:  *     25      signal mask     (dependant on magic)
                     40:  *     26      (con't)
                     41:  *     27      (con't)
                     42:  *     28      (con't)
                     43:  *
                     44:  * The magic number number identifies the jmp_buf and
                     45:  * how the buffer was created as well as providing
                     46:  * a sanity check
                     47:  *
                     48:  * A side note I should mention - Please do not tamper
                     49:  * with the floating point fields. While they are
                     50:  * always saved and restored at the moment this cannot
                     51:  * be garenteed especially if the compiler happens
                     52:  * to be generating soft-float code so no fp
                     53:  * registers will be used.
                     54:  *
                     55:  * Whilst this can be seen an encouraging people to
                     56:  * use the setjmp buffer in this way I think that it
                     57:  * is for the best then if changes occur compiles will
                     58:  * break rather than just having new builds falling over
                     59:  * mysteriously.
                     60:  */
                     61:
                     62: #define _JB_MAGIC__SETJMP      0x4278f500
                     63: #define _JB_MAGIC_SETJMP       0x4278f501
                     64:
                     65: /* Valid for all jmp_buf's */
                     66:
                     67: #define _JB_MAGIC               0
                     68: #define _JB_REG_F4              1
                     69: #define _JB_REG_F5              4
                     70: #define _JB_REG_F6              7
                     71: #define _JB_REG_F7             10
                     72: #define _JB_REG_FPSR           13
                     73: #define _JB_REG_R4             14
                     74: #define _JB_REG_R5             15
                     75: #define _JB_REG_R6             16
                     76: #define _JB_REG_R7             17
                     77: #define _JB_REG_R8             18
                     78: #define _JB_REG_R9             19
                     79: #define _JB_REG_R10            20
                     80: #define _JB_REG_R11            21
                     81: #define _JB_REG_R12            22
                     82: #define _JB_REG_R13            23
                     83: #define _JB_REG_R14            24
                     84:
                     85: /* Only valid with the _JB_MAGIC_SETJMP magic */
                     86:
                     87: #define _JB_SIGMASK            25