1 /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */ 2 /* $FreeBSD$ */ 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 88 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE 89 typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1]; 90 #endif 91 92 typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1]; 93 94