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setjmp.h revision 1.4 
      1 /*	$NetBSD: setjmp.h,v 1.4 2011/06/30 20:09:20 wiz 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  *       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	(dependent 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
     83