1 /* $NetBSD: setjmp.h,v 1.6 2024/05/06 07:29:30 skrll 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 it's commercial !). 14 * 15 * Description of the setjmp buffer 16 * 17 * Word Field Comment 18 * 0 magic number (dependent on creator) 19 * 13 fpscr vfp status control register 20 * 14 r4 register 4 21 * 15 r5 register 5 22 * 16 r6 register 6 23 * 17 r7 register 7 24 * 18 r8 register 8 25 * 19 r9 register 9 26 * 20 r10 register 10 (sl) 27 * 21 r11 register 11 (fp) 28 * 22 r12 register 12 (ip) 29 * 23 r13 register 13 (sp) 30 * 24 r14 register 14 (lr) 31 * 25 signal mask (dependent on magic) 32 * 26 (con't) 33 * 27 (con't) 34 * 28 (con't) 35 * 32-33 d8 (vfp register d8) 36 * 34-35 d9 (vfp register d9) 37 * 36-37 d10 (vfp register d10) 38 * 38-39 d11 (vfp register d11) 39 * 40-41 d12 (vfp register d12) 40 * 42-43 d13 (vfp register d13) 41 * 44-45 d14 (vfp register d14) 42 * 46-47 d15 (vfp register d15) 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 guaranteed 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 as 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 #define _JB_MAGIC__SETJMP_VFP 0x4278f502 65 #define _JB_MAGIC_SETJMP_VFP 0x4278f503 66 67 /* Valid for all jmp_buf's */ 68 69 #define _JB_MAGIC 0 70 #define _JB_REG_FPSCR 13 71 #define _JB_REG_R4 14 72 #define _JB_REG_R5 15 73 #define _JB_REG_R6 16 74 #define _JB_REG_R7 17 75 #define _JB_REG_R8 18 76 #define _JB_REG_R9 19 77 #define _JB_REG_R10 20 78 #define _JB_REG_R11 21 79 #define _JB_REG_R12 22 80 #define _JB_REG_R13 23 81 #define _JB_REG_R14 24 82 83 /* Only valid with the _JB_MAGIC_SETJMP magic */ 84 85 #define _JB_SIGMASK 25 86 87 #define _JB_REG_D8 32 88 #define _JB_REG_D9 34 89 #define _JB_REG_D10 36 90 #define _JB_REG_D11 38 91 #define _JB_REG_D12 40 92 #define _JB_REG_D13 42 93 #define _JB_REG_D14 44 94 #define _JB_REG_D15 46 95