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      1 /*	$NetBSD: setjmp.h,v 1.6 2024/05/06 07:29:30 skrll 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 it's commercial !).
     14  *
     15  * Description of the setjmp buffer
     16  *
     17  * Word		Field		Comment
     18  * 	0	magic number	(dependent on creator)
     19  *	13	fpscr		vfp status control register
     20  *	14	r4		register 4
     21  *	15	r5		register 5
     22  *	16	r6		register 6
     23  *	17	r7		register 7
     24  *	18	r8		register 8
     25  *	19	r9		register 9
     26  *	20	r10		register 10 (sl)
     27  *	21	r11		register 11 (fp)
     28  *	22	r12		register 12 (ip)
     29  *	23	r13		register 13 (sp)
     30  *	24	r14		register 14 (lr)
     31  *	25	signal mask	(dependent on magic)
     32  *	26	(con't)
     33  *	27	(con't)
     34  *	28	(con't)
     35  *	32-33	d8		(vfp register d8)
     36  *	34-35	d9		(vfp register d9)
     37  *	36-37	d10		(vfp register d10)
     38  *	38-39	d11		(vfp register d11)
     39  *	40-41	d12		(vfp register d12)
     40  *	42-43	d13		(vfp register d13)
     41  *	44-45	d14		(vfp register d14)
     42  *	46-47	d15		(vfp register d15)
     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 guaranteed 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 as 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 #define _JB_MAGIC__SETJMP_VFP	0x4278f502
     65 #define _JB_MAGIC_SETJMP_VFP	0x4278f503
     66 
     67 /* Valid for all jmp_buf's */
     68 
     69 #define _JB_MAGIC		 0
     70 #define _JB_REG_FPSCR		13
     71 #define _JB_REG_R4		14
     72 #define _JB_REG_R5		15
     73 #define _JB_REG_R6		16
     74 #define _JB_REG_R7		17
     75 #define _JB_REG_R8		18
     76 #define _JB_REG_R9		19
     77 #define _JB_REG_R10		20
     78 #define _JB_REG_R11		21
     79 #define _JB_REG_R12		22
     80 #define _JB_REG_R13		23
     81 #define _JB_REG_R14		24
     82 
     83 /* Only valid with the _JB_MAGIC_SETJMP magic */
     84 
     85 #define _JB_SIGMASK		25
     86 
     87 #define	_JB_REG_D8		32
     88 #define	_JB_REG_D9		34
     89 #define	_JB_REG_D10		36
     90 #define	_JB_REG_D11		38
     91 #define	_JB_REG_D12		40
     92 #define	_JB_REG_D13		42
     93 #define	_JB_REG_D14		44
     94 #define	_JB_REG_D15		46
     95