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setjmp.h revision 1.2 
      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 #ifdef __ELF__
      8 #define	_JBLEN	64		/* size, in longs, of a jmp_buf */
      9 #else
     10 #define	_JBLEN	29		/* size, in longs, of a jmp_buf */
     11 #endif
     12 
     13 /*
     14  * NOTE: The internal structure of a jmp_buf is *PRIVATE*
     15  *       This information is provided as there is software
     16  *       that fiddles with this with obtain the stack pointer
     17  *	 (yes really ! and its commercial !).
     18  *
     19  * Description of the setjmp buffer
     20  *
     21  * word  0	magic number	(dependant on creator)
     22  *       1 -  3	f4		fp register 4
     23  *	 4 -  6	f5		fp register 5
     24  *	 7 -  9 f6		fp register 6
     25  *	10 - 12	f7		fp register 7
     26  *	13	fpsr		fp status register
     27  *	14	r4		register 4
     28  *	15	r5		register 5
     29  *	16	r6		register 6
     30  *	17	r7		register 7
     31  *	18	r8		register 8
     32  *	19	r9		register 9
     33  *	20	r10		register 10 (sl)
     34  *	21	r11		register 11 (fp)
     35  *	22	r12		register 12 (ip)
     36  *	23	r13		register 13 (sp)
     37  *	24	r14		register 14 (lr)
     38  *	25	signal mask	(dependant on magic)
     39  *	26	(con't)
     40  *	27	(con't)
     41  *	28	(con't)
     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 
     64 /* Valid for all jmp_buf's */
     65 
     66 #define _JB_MAGIC		 0
     67 #define _JB_REG_F4		 1
     68 #define _JB_REG_F5		 4
     69 #define _JB_REG_F6		 7
     70 #define _JB_REG_F7		10
     71 #define _JB_REG_FPSR		13
     72 #define _JB_REG_R4		14
     73 #define _JB_REG_R5		15
     74 #define _JB_REG_R6		16
     75 #define _JB_REG_R7		17
     76 #define _JB_REG_R8		18
     77 #define _JB_REG_R9		19
     78 #define _JB_REG_R10		20
     79 #define _JB_REG_R11		21
     80 #define _JB_REG_R12		22
     81 #define _JB_REG_R13		23
     82 #define _JB_REG_R14		24
     83 
     84 /* Only valid with the _JB_MAGIC_SETJMP magic */
     85 
     86 #define _JB_SIGMASK		25
     87