1 /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */ 2 3 /* 4 * machine/setjmp.h: machine dependent setjmp-related information. 5 */ 6 7 #ifdef __ELF__ 8 #define _JBLEN 64 /* size, in longs, of a jmp_buf */ 9 #else 10 #define _JBLEN 29 /* size, in longs, of a jmp_buf */ 11 #endif 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 (dependant on creator) 22 * 1 - 3 f4 fp register 4 23 * 4 - 6 f5 fp register 5 24 * 7 - 9 f6 fp register 6 25 * 10 - 12 f7 fp register 7 26 * 13 fpsr fp status register 27 * 14 r4 register 4 28 * 15 r5 register 5 29 * 16 r6 register 6 30 * 17 r7 register 7 31 * 18 r8 register 8 32 * 19 r9 register 9 33 * 20 r10 register 10 (sl) 34 * 21 r11 register 11 (fp) 35 * 22 r12 register 12 (ip) 36 * 23 r13 register 13 (sp) 37 * 24 r14 register 14 (lr) 38 * 25 signal mask (dependant on magic) 39 * 26 (con't) 40 * 27 (con't) 41 * 28 (con't) 42 * 43 * The magic number number identifies the jmp_buf and 44 * how the buffer was created as well as providing 45 * a sanity check 46 * 47 * A side note I should mention - Please do not tamper 48 * with the floating point fields. While they are 49 * always saved and restored at the moment this cannot 50 * be garenteed especially if the compiler happens 51 * to be generating soft-float code so no fp 52 * registers will be used. 53 * 54 * Whilst this can be seen an encouraging people to 55 * use the setjmp buffer in this way I think that it 56 * is for the best then if changes occur compiles will 57 * break rather than just having new builds falling over 58 * mysteriously. 59 */ 60 61 #define _JB_MAGIC__SETJMP 0x4278f500 62 #define _JB_MAGIC_SETJMP 0x4278f501 63 64 /* Valid for all jmp_buf's */ 65 66 #define _JB_MAGIC 0 67 #define _JB_REG_F4 1 68 #define _JB_REG_F5 4 69 #define _JB_REG_F6 7 70 #define _JB_REG_F7 10 71 #define _JB_REG_FPSR 13 72 #define _JB_REG_R4 14 73 #define _JB_REG_R5 15 74 #define _JB_REG_R6 16 75 #define _JB_REG_R7 17 76 #define _JB_REG_R8 18 77 #define _JB_REG_R9 19 78 #define _JB_REG_R10 20 79 #define _JB_REG_R11 21 80 #define _JB_REG_R12 22 81 #define _JB_REG_R13 23 82 #define _JB_REG_R14 24 83 84 /* Only valid with the _JB_MAGIC_SETJMP magic */ 85 86 #define _JB_SIGMASK 25 87