1 /* $NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $ */ 2 /* $FreeBSD$ */ 3 4 /* 5 * machine/setjmp.h: machine dependent setjmp-related information. 6 */ 7 8 #ifndef _MACHINE_SETJMP_H_ 9 #define _MACHINE_SETJMP_H_ 10 11 #define _JBLEN 64 /* size, in longs, of a jmp_buf */ 12 13 /* 14 * NOTE: The internal structure of a jmp_buf is *PRIVATE* 15 * This information is provided as there is software 16 * that fiddles with this with obtain the stack pointer 17 * (yes really ! and its commercial !). 18 * 19 * Description of the setjmp buffer 20 * 21 * word 0 magic number (dependent on creator) 22 * 13 fpscr vfp status control register 23 * 14 r4 register 4 24 * 15 r5 register 5 25 * 16 r6 register 6 26 * 17 r7 register 7 27 * 18 r8 register 8 28 * 19 r9 register 9 29 * 20 r10 register 10 (sl) 30 * 21 r11 register 11 (fp) 31 * 22 r12 register 12 (ip) 32 * 23 r13 register 13 (sp) 33 * 24 r14 register 14 (lr) 34 * 25 signal mask (dependent on magic) 35 * 26 (con't) 36 * 27 (con't) 37 * 28 (con't) 38 * 32-33 d8 (vfp register d8) 39 * 34-35 d9 (vfp register d9) 40 * 36-37 d10 (vfp register d10) 41 * 38-39 d11 (vfp register d11) 42 * 40-41 d12 (vfp register d12) 43 * 42-43 d13 (vfp register d13) 44 * 44-45 d14 (vfp register d14) 45 * 46-47 d15 (vfp register d15) 46 * 47 * The magic number identifies the jmp_buf and 48 * how the buffer was created as well as providing 49 * a sanity check 50 * 51 * A side note I should mention - Please do not tamper 52 * with the floating point fields. While they are 53 * always saved and restored at the moment this cannot 54 * be garenteed especially if the compiler happens 55 * to be generating soft-float code so no fp 56 * registers will be used. 57 * 58 * Whilst this can be seen an encouraging people to 59 * use the setjmp buffer in this way I think that it 60 * is for the best then if changes occur compiles will 61 * break rather than just having new builds falling over 62 * mysteriously. 63 */ 64 65 #define _JB_MAGIC__SETJMP 0x4278f500 66 #define _JB_MAGIC_SETJMP 0x4278f501 67 #define _JB_MAGIC__SETJMP_VFP 0x4278f502 68 #define _JB_MAGIC_SETJMP_VFP 0x4278f503 69 70 /* Valid for all jmp_buf's */ 71 72 #define _JB_MAGIC 0 73 #define _JB_REG_FPSCR 13 74 #define _JB_REG_R4 14 75 #define _JB_REG_R5 15 76 #define _JB_REG_R6 16 77 #define _JB_REG_R7 17 78 #define _JB_REG_R8 18 79 #define _JB_REG_R9 19 80 #define _JB_REG_R10 20 81 #define _JB_REG_R11 21 82 #define _JB_REG_R12 22 83 #define _JB_REG_R13 23 84 #define _JB_REG_R14 24 85 86 /* Only valid with the _JB_MAGIC_SETJMP magic */ 87 88 #define _JB_SIGMASK 25 89 90 #define _JB_REG_D8 32 91 #define _JB_REG_D9 34 92 #define _JB_REG_D10 36 93 #define _JB_REG_D11 38 94 #define _JB_REG_D12 40 95 #define _JB_REG_D13 42 96 #define _JB_REG_D14 44 97 #define _JB_REG_D15 46 98 99 #ifndef __ASSEMBLER__ 100 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE 101 typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1]; 102 #endif 103 104 typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1]; 105 #endif 106 107 #endif /* !_MACHINE_SETJMP_H_ */ 108