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/* $NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $ */
/* $FreeBSD$ */
/*
* machine/setjmp.h: machine dependent setjmp-related information.
*/
#ifndef _MACHINE_SETJMP_H_
#define _MACHINE_SETJMP_H_
#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 (dependent on creator)
* 13 fpscr vfp status control 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 (dependent on magic)
* 26 (con't)
* 27 (con't)
* 28 (con't)
* 32-33 d8 (vfp register d8)
* 34-35 d9 (vfp register d9)
* 36-37 d10 (vfp register d10)
* 38-39 d11 (vfp register d11)
* 40-41 d12 (vfp register d12)
* 42-43 d13 (vfp register d13)
* 44-45 d14 (vfp register d14)
* 46-47 d15 (vfp register d15)
*
* 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
#define _JB_MAGIC__SETJMP_VFP 0x4278f502
#define _JB_MAGIC_SETJMP_VFP 0x4278f503
/* Valid for all jmp_buf's */
#define _JB_MAGIC 0
#define _JB_REG_FPSCR 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
#define _JB_REG_D8 32
#define _JB_REG_D9 34
#define _JB_REG_D10 36
#define _JB_REG_D11 38
#define _JB_REG_D12 40
#define _JB_REG_D13 42
#define _JB_REG_D14 44
#define _JB_REG_D15 46
#ifndef __ASSEMBLER__
#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
#endif
typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
#endif
#endif /* !_MACHINE_SETJMP_H_ */
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