94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
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/* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
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/* $FreeBSD$ */
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/*
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* machine/setjmp.h: machine dependent setjmp-related information.
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*/
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#ifdef __ELF__
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#define _JBLEN 64 /* size, in longs, of a jmp_buf */
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#else
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#define _JBLEN 29 /* size, in longs, of a jmp_buf */
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#endif
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/*
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* NOTE: The internal structure of a jmp_buf is *PRIVATE*
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* This information is provided as there is software
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* that fiddles with this with obtain the stack pointer
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* (yes really ! and its commercial !).
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*
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* Description of the setjmp buffer
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*
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* word 0 magic number (dependant on creator)
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* 1 - 3 f4 fp register 4
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* 4 - 6 f5 fp register 5
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* 7 - 9 f6 fp register 6
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* 10 - 12 f7 fp register 7
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* 13 fpsr fp status register
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* 14 r4 register 4
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* 15 r5 register 5
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* 16 r6 register 6
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* 17 r7 register 7
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* 18 r8 register 8
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* 19 r9 register 9
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* 20 r10 register 10 (sl)
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* 21 r11 register 11 (fp)
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* 22 r12 register 12 (ip)
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* 23 r13 register 13 (sp)
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* 24 r14 register 14 (lr)
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* 25 signal mask (dependant on magic)
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* 26 (con't)
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* 27 (con't)
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* 28 (con't)
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*
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* The magic number number identifies the jmp_buf and
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* how the buffer was created as well as providing
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* a sanity check
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*
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* A side note I should mention - Please do not tamper
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* with the floating point fields. While they are
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* always saved and restored at the moment this cannot
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* be garenteed especially if the compiler happens
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* to be generating soft-float code so no fp
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* registers will be used.
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*
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* Whilst this can be seen an encouraging people to
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* use the setjmp buffer in this way I think that it
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* is for the best then if changes occur compiles will
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* break rather than just having new builds falling over
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* mysteriously.
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*/
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#define _JB_MAGIC__SETJMP 0x4278f500
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#define _JB_MAGIC_SETJMP 0x4278f501
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/* Valid for all jmp_buf's */
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#define _JB_MAGIC 0
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#define _JB_REG_F4 1
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#define _JB_REG_F5 4
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#define _JB_REG_F6 7
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#define _JB_REG_F7 10
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#define _JB_REG_FPSR 13
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#define _JB_REG_R4 14
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#define _JB_REG_R5 15
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#define _JB_REG_R6 16
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#define _JB_REG_R7 17
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#define _JB_REG_R8 18
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#define _JB_REG_R9 19
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#define _JB_REG_R10 20
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#define _JB_REG_R11 21
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#define _JB_REG_R12 22
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#define _JB_REG_R13 23
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#define _JB_REG_R14 24
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/* Only valid with the _JB_MAGIC_SETJMP magic */
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#define _JB_SIGMASK 25
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#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
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typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
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#endif
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typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
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