1 /* $OpenBSD: setjmp.h,v 1.6 2023/04/11 00:45:07 jsg Exp $ */ 2 /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */ 3 4 /* 5 * machine/setjmp.h: machine dependent setjmp-related information. 6 */ 7 8 #define _JBLEN 64 /* size, in longs, of a jmp_buf */ 9 10 /* 11 * Description of the setjmp buffer 12 * 13 * word 0 magic number (dependant on creator) 14 * 1 fpscr fpscr 15 * 2 - 17 d8 - d15 vfp registers 16 * 18 r13 register 13 (sp) XOR cookie0 17 * 19 r14 register 14 (lr) XOR cookie1 18 * 20 r4 register 4 19 * 21 r5 register 5 20 * 22 r6 register 6 21 * 23 r7 register 7 22 * 24 r8 register 8 23 * 25 r9 register 9 24 * 26 r10 register 10 (sl) 25 * 27 r11 register 11 (fp) 26 * 28 unused unused 27 * 29 signal mask (dependant on magic) 28 * 30 (con't) 29 * 31 (con't) 30 * 32 (con't) 31 * 32 * The magic number identifies the jmp_buf and 33 * how the buffer was created as well as providing 34 * a sanity check. 35 * 36 * A side note I should mention - please do not tamper 37 * with the floating point fields. While they are 38 * always saved and restored at the moment this cannot 39 * be guaranteed especially if the compiler happens 40 * to be generating soft-float code so no fp 41 * registers will be used. 42 * 43 * Whilst this can be seen an encouraging people to 44 * use the setjmp buffer in this way I think that it 45 * is for the best then if changes occur compiles will 46 * break rather than just having new builds falling over 47 * mysteriously. 48 */ 49 50 #define _JB_MAGIC__SETJMP 0x4278f500 51 #define _JB_MAGIC_SETJMP 0x4278f501 52 53 /* Valid for all jmp_buf's */ 54 55 #define _JB_MAGIC 0 56 #define _JB_REG_R4 20 57 #define _JB_REG_R5 21 58 #define _JB_REG_R6 22 59 #define _JB_REG_R7 23 60 #define _JB_REG_R8 24 61 #define _JB_REG_R9 25 62 #define _JB_REG_R10 26 63 #define _JB_REG_R11 27 64 65 /* Only valid with the _JB_MAGIC_SETJMP magic */ 66 67 #define _JB_SIGMASK 29 68