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/* $OpenBSD: setjmp.h,v 1.2 2011/09/20 22:02:13 miod Exp $ */
/* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
/*
* machine/setjmp.h: machine dependent setjmp-related information.
*/
#define _JBLEN 64 /* size, in longs, of a jmp_buf */
/*
* NOTE: The internal structure of a jmp_buf is *PRIVATE*
* This information is provided as there is software
* that fiddles with this with obtain the stack pointer
* (yes really ! and its commercial !).
*
* Description of the setjmp buffer
*
* word 0 magic number (dependant on creator)
* 1 - 3 f4 fp register 4
* 4 - 6 f5 fp register 5
* 7 - 9 f6 fp register 6
* 10 - 12 f7 fp register 7
* 13 fpsr fp status register
* 14 r4 register 4
* 15 r5 register 5
* 16 r6 register 6
* 17 r7 register 7
* 18 r8 register 8
* 19 r9 register 9
* 20 r10 register 10 (sl)
* 21 r11 register 11 (fp)
* 22 r12 register 12 (ip)
* 23 r13 register 13 (sp)
* 24 r14 register 14 (lr)
* 25 signal mask (dependant on magic)
* 26 (con't)
* 27 (con't)
* 28 (con't)
*
* The magic number number identifies the jmp_buf and
* how the buffer was created as well as providing
* a sanity check
*
* A side note I should mention - Please do not tamper
* with the floating point fields. While they are
* always saved and restored at the moment this cannot
* be garenteed especially if the compiler happens
* to be generating soft-float code so no fp
* registers will be used.
*
* Whilst this can be seen an encouraging people to
* use the setjmp buffer in this way I think that it
* is for the best then if changes occur compiles will
* break rather than just having new builds falling over
* mysteriously.
*/
#define _JB_MAGIC__SETJMP 0x4278f500
#define _JB_MAGIC_SETJMP 0x4278f501
/* Valid for all jmp_buf's */
#define _JB_MAGIC 0
#define _JB_REG_F4 1
#define _JB_REG_F5 4
#define _JB_REG_F6 7
#define _JB_REG_F7 10
#define _JB_REG_FPSR 13
#define _JB_REG_R4 14
#define _JB_REG_R5 15
#define _JB_REG_R6 16
#define _JB_REG_R7 17
#define _JB_REG_R8 18
#define _JB_REG_R9 19
#define _JB_REG_R10 20
#define _JB_REG_R11 21
#define _JB_REG_R12 22
#define _JB_REG_R13 23
#define _JB_REG_R14 24
/* Only valid with the _JB_MAGIC_SETJMP magic */
#define _JB_SIGMASK 25
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