| /* $OpenBSD: setjmp.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */ |
| /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */ |
| |
| /* |
| * machine/setjmp.h: machine dependent setjmp-related information. |
| */ |
| |
| #ifdef __ELF__ |
| #define _JBLEN 64 /* size, in longs, of a jmp_buf */ |
| #else |
| #define _JBLEN 29 /* size, in longs, of a jmp_buf */ |
| #endif |
| |
| /* |
| * NOTE: The internal structure of a jmp_buf is *PRIVATE* |
| * This information is provided as there is software |
| * that fiddles with this with obtain the stack pointer |
| * (yes really ! and its commercial !). |
| * |
| * Description of the setjmp buffer |
| * |
| * word 0 magic number (dependant on creator) |
| * 1 - 3 f4 fp register 4 |
| * 4 - 6 f5 fp register 5 |
| * 7 - 9 f6 fp register 6 |
| * 10 - 12 f7 fp register 7 |
| * 13 fpsr fp status register |
| * 14 r4 register 4 |
| * 15 r5 register 5 |
| * 16 r6 register 6 |
| * 17 r7 register 7 |
| * 18 r8 register 8 |
| * 19 r9 register 9 |
| * 20 r10 register 10 (sl) |
| * 21 r11 register 11 (fp) |
| * 22 r12 register 12 (ip) |
| * 23 r13 register 13 (sp) |
| * 24 r14 register 14 (lr) |
| * 25 signal mask (dependant on magic) |
| * 26 (con't) |
| * 27 (con't) |
| * 28 (con't) |
| * |
| * The magic number number identifies the jmp_buf and |
| * how the buffer was created as well as providing |
| * a sanity check |
| * |
| * A side note I should mention - Please do not tamper |
| * with the floating point fields. While they are |
| * always saved and restored at the moment this cannot |
| * be garenteed especially if the compiler happens |
| * to be generating soft-float code so no fp |
| * registers will be used. |
| * |
| * Whilst this can be seen an encouraging people to |
| * use the setjmp buffer in this way I think that it |
| * is for the best then if changes occur compiles will |
| * break rather than just having new builds falling over |
| * mysteriously. |
| */ |
| |
| #define _JB_MAGIC__SETJMP 0x4278f500 |
| #define _JB_MAGIC_SETJMP 0x4278f501 |
| |
| /* Valid for all jmp_buf's */ |
| |
| #define _JB_MAGIC 0 |
| #define _JB_REG_F4 1 |
| #define _JB_REG_F5 4 |
| #define _JB_REG_F6 7 |
| #define _JB_REG_F7 10 |
| #define _JB_REG_FPSR 13 |
| #define _JB_REG_R4 14 |
| #define _JB_REG_R5 15 |
| #define _JB_REG_R6 16 |
| #define _JB_REG_R7 17 |
| #define _JB_REG_R8 18 |
| #define _JB_REG_R9 19 |
| #define _JB_REG_R10 20 |
| #define _JB_REG_R11 21 |
| #define _JB_REG_R12 22 |
| #define _JB_REG_R13 23 |
| #define _JB_REG_R14 24 |
| |
| /* Only valid with the _JB_MAGIC_SETJMP magic */ |
| |
| #define _JB_SIGMASK 25 |
