| 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 |