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