setjmp.h (2866B) - Raw
1 /* $NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $ */ 2 3 /* 4 * machine/setjmp.h: machine dependent setjmp-related information. 5 */ 6 7 #ifndef _MACHINE_SETJMP_H_ 8 #define _MACHINE_SETJMP_H_ 9 10 #define _JBLEN 64 /* size, in longs, of a jmp_buf */ 11 12 /* 13 * NOTE: The internal structure of a jmp_buf is *PRIVATE* 14 * This information is provided as there is software 15 * that fiddles with this with obtain the stack pointer 16 * (yes really ! and its commercial !). 17 * 18 * Description of the setjmp buffer 19 * 20 * word 0 magic number (dependent on creator) 21 * 13 fpscr vfp status control register 22 * 14 r4 register 4 23 * 15 r5 register 5 24 * 16 r6 register 6 25 * 17 r7 register 7 26 * 18 r8 register 8 27 * 19 r9 register 9 28 * 20 r10 register 10 (sl) 29 * 21 r11 register 11 (fp) 30 * 22 r12 register 12 (ip) 31 * 23 r13 register 13 (sp) 32 * 24 r14 register 14 (lr) 33 * 25 signal mask (dependent on magic) 34 * 26 (con't) 35 * 27 (con't) 36 * 28 (con't) 37 * 32-33 d8 (vfp register d8) 38 * 34-35 d9 (vfp register d9) 39 * 36-37 d10 (vfp register d10) 40 * 38-39 d11 (vfp register d11) 41 * 40-41 d12 (vfp register d12) 42 * 42-43 d13 (vfp register d13) 43 * 44-45 d14 (vfp register d14) 44 * 46-47 d15 (vfp register d15) 45 * 46 * The magic number identifies the jmp_buf and 47 * how the buffer was created as well as providing 48 * a sanity check 49 * 50 * A side note I should mention - Please do not tamper 51 * with the floating point fields. While they are 52 * always saved and restored at the moment this cannot 53 * be garenteed especially if the compiler happens 54 * to be generating soft-float code so no fp 55 * registers will be used. 56 * 57 * Whilst this can be seen an encouraging people to 58 * use the setjmp buffer in this way I think that it 59 * is for the best then if changes occur compiles will 60 * break rather than just having new builds falling over 61 * mysteriously. 62 */ 63 64 #define _JB_MAGIC__SETJMP 0x4278f500 65 #define _JB_MAGIC_SETJMP 0x4278f501 66 #define _JB_MAGIC__SETJMP_VFP 0x4278f502 67 #define _JB_MAGIC_SETJMP_VFP 0x4278f503 68 69 /* Valid for all jmp_buf's */ 70 71 #define _JB_MAGIC 0 72 #define _JB_REG_FPSCR 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 88 89 #define _JB_REG_D8 32 90 #define _JB_REG_D9 34 91 #define _JB_REG_D10 36 92 #define _JB_REG_D11 38 93 #define _JB_REG_D12 40 94 #define _JB_REG_D13 42 95 #define _JB_REG_D14 44 96 #define _JB_REG_D15 46 97 98 #ifndef __ASSEMBLER__ 99 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE 100 typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1]; 101 #endif 102 103 typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1]; 104 #endif 105 106 #endif /* !_MACHINE_SETJMP_H_ */