Annotation of sys/arch/arm/include/setjmp.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: setjmp.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */
! 2: /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
! 3:
! 4: /*
! 5: * machine/setjmp.h: machine dependent setjmp-related information.
! 6: */
! 7:
! 8: #ifdef __ELF__
! 9: #define _JBLEN 64 /* size, in longs, of a jmp_buf */
! 10: #else
! 11: #define _JBLEN 29 /* size, in longs, of a jmp_buf */
! 12: #endif
! 13:
! 14: /*
! 15: * NOTE: The internal structure of a jmp_buf is *PRIVATE*
! 16: * This information is provided as there is software
! 17: * that fiddles with this with obtain the stack pointer
! 18: * (yes really ! and its commercial !).
! 19: *
! 20: * Description of the setjmp buffer
! 21: *
! 22: * word 0 magic number (dependant on creator)
! 23: * 1 - 3 f4 fp register 4
! 24: * 4 - 6 f5 fp register 5
! 25: * 7 - 9 f6 fp register 6
! 26: * 10 - 12 f7 fp register 7
! 27: * 13 fpsr fp status register
! 28: * 14 r4 register 4
! 29: * 15 r5 register 5
! 30: * 16 r6 register 6
! 31: * 17 r7 register 7
! 32: * 18 r8 register 8
! 33: * 19 r9 register 9
! 34: * 20 r10 register 10 (sl)
! 35: * 21 r11 register 11 (fp)
! 36: * 22 r12 register 12 (ip)
! 37: * 23 r13 register 13 (sp)
! 38: * 24 r14 register 14 (lr)
! 39: * 25 signal mask (dependant on magic)
! 40: * 26 (con't)
! 41: * 27 (con't)
! 42: * 28 (con't)
! 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 garenteed 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 an 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:
! 65: /* Valid for all jmp_buf's */
! 66:
! 67: #define _JB_MAGIC 0
! 68: #define _JB_REG_F4 1
! 69: #define _JB_REG_F5 4
! 70: #define _JB_REG_F6 7
! 71: #define _JB_REG_F7 10
! 72: #define _JB_REG_FPSR 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
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