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#ifndef _MACHINE_SETJMP_H_
  8#define _MACHINE_SETJMP_H_
  9
 10#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
 11
 12/*
 13 * NOTE: The internal structure of a jmp_buf is *PRIVATE*
 14 *       This information is provided as there is software
 15 *       that fiddles with this with obtain the stack pointer
 16 *	 (yes really ! and its commercial !).
 17 *
 18 * Description of the setjmp buffer
 19 *
 20 * word  0	magic number	(dependent on creator)
 21 *	13	fpscr		vfp status control register
 22 *	14	r4		register 4
 23 *	15	r5		register 5
 24 *	16	r6		register 6
 25 *	17	r7		register 7
 26 *	18	r8		register 8
 27 *	19	r9		register 9
 28 *	20	r10		register 10 (sl)
 29 *	21	r11		register 11 (fp)
 30 *	22	r12		register 12 (ip)
 31 *	23	r13		register 13 (sp)
 32 *	24	r14		register 14 (lr)
 33 *	25	signal mask	(dependent on magic)
 34 *	26	(con't)
 35 *	27	(con't)
 36 *	28	(con't)
 37 *	32-33	d8		(vfp register d8)
 38 *	34-35	d9		(vfp register d9)
 39 *	36-37	d10		(vfp register d10)
 40 *	38-39	d11		(vfp register d11)
 41 *	40-41	d12		(vfp register d12)
 42 *	42-43	d13		(vfp register d13)
 43 *	44-45	d14		(vfp register d14)
 44 *	46-47	d15		(vfp register d15)
 45 *
 46 * The magic number identifies the jmp_buf and
 47 * how the buffer was created as well as providing
 48 * a sanity check
 49 *
 50 * A side note I should mention - Please do not tamper
 51 * with the floating point fields. While they are
 52 * always saved and restored at the moment this cannot
 53 * be garenteed especially if the compiler happens
 54 * to be generating soft-float code so no fp
 55 * registers will be used.
 56 *
 57 * Whilst this can be seen an encouraging people to
 58 * use the setjmp buffer in this way I think that it
 59 * is for the best then if changes occur compiles will
 60 * break rather than just having new builds falling over
 61 * mysteriously.
 62 */
 63
 64#define _JB_MAGIC__SETJMP	0x4278f500
 65#define _JB_MAGIC_SETJMP	0x4278f501
 66#define _JB_MAGIC__SETJMP_VFP	0x4278f502
 67#define _JB_MAGIC_SETJMP_VFP	0x4278f503
 68
 69/* Valid for all jmp_buf's */
 70
 71#define _JB_MAGIC		 0
 72#define _JB_REG_FPSCR		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
 88
 89#define	_JB_REG_D8		32
 90#define	_JB_REG_D9		34
 91#define	_JB_REG_D10		36
 92#define	_JB_REG_D11		38
 93#define	_JB_REG_D12		40
 94#define	_JB_REG_D13		42
 95#define	_JB_REG_D14		44
 96#define	_JB_REG_D15		46
 97
 98#ifndef __ASSEMBLER__
 99#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
100typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
101#endif
102
103typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
104#endif
105
106#endif /* !_MACHINE_SETJMP_H_ */