1 /* $NetBSD: setjmp.h,v 1.3 2008/08/29 19:08:29 matt Exp $ */ 2 3 /* 4 * machine/setjmp.h: machine dependent setjmp-related information. 5 */ 6 7 #define _JBLEN 64 /* size, in longs, of a jmp_buf */ 8 9 /* 10 * NOTE: The internal structure of a jmp_buf is *PRIVATE* 11 * This information is provided as there is software 12 * that fiddles with this with obtain the stack pointer 13 * (yes really ! and its commercial !). 14 * 15 * Description of the setjmp buffer 16 * 17 * word 0 magic number (dependant on creator) 18 * 1 - 3 f4 fp register 4 19 * 4 - 6 f5 fp register 5 20 * 7 - 9 f6 fp register 6 21 * 10 - 12 f7 fp register 7 22 * 13 fpsr fp status 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 (dependant on magic) 35 * 26 (con't) 36 * 27 (con't) 37 * 28 (con't) 38 * 39 * The magic number number identifies the jmp_buf and 40 * how the buffer was created as well as providing 41 * a sanity check 42 * 43 * A side note I should mention - Please do not tamper 44 * with the floating point fields. While they are 45 * always saved and restored at the moment this cannot 46 * be garenteed especially if the compiler happens 47 * to be generating soft-float code so no fp 48 * registers will be used. 49 * 50 * Whilst this can be seen an encouraging people to 51 * use the setjmp buffer in this way I think that it 52 * is for the best then if changes occur compiles will 53 * break rather than just having new builds falling over 54 * mysteriously. 55 */ 56 57 #define _JB_MAGIC__SETJMP 0x4278f500 58 #define _JB_MAGIC_SETJMP 0x4278f501 59 60 /* Valid for all jmp_buf's */ 61 62 #define _JB_MAGIC 0 63 #define _JB_REG_F4 1 64 #define _JB_REG_F5 4 65 #define _JB_REG_F6 7 66 #define _JB_REG_F7 10 67 #define _JB_REG_FPSR 13 68 #define _JB_REG_R4 14 69 #define _JB_REG_R5 15 70 #define _JB_REG_R6 16 71 #define _JB_REG_R7 17 72 #define _JB_REG_R8 18 73 #define _JB_REG_R9 19 74 #define _JB_REG_R10 20 75 #define _JB_REG_R11 21 76 #define _JB_REG_R12 22 77 #define _JB_REG_R13 23 78 #define _JB_REG_R14 24 79 80 /* Only valid with the _JB_MAGIC_SETJMP magic */ 81 82 #define _JB_SIGMASK 25 83