/* $NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $ */ /* * machine/setjmp.h: machine dependent setjmp-related information. */ #ifndef _MACHINE_SETJMP_H_ #define _MACHINE_SETJMP_H_ #define _JBLEN 64 /* size, in longs, of a jmp_buf */ /* * 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 (dependent on creator) * 13 fpscr vfp status control 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 (dependent on magic) * 26 (con't) * 27 (con't) * 28 (con't) * 32-33 d8 (vfp register d8) * 34-35 d9 (vfp register d9) * 36-37 d10 (vfp register d10) * 38-39 d11 (vfp register d11) * 40-41 d12 (vfp register d12) * 42-43 d13 (vfp register d13) * 44-45 d14 (vfp register d14) * 46-47 d15 (vfp register d15) * * The magic 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 #define _JB_MAGIC__SETJMP_VFP 0x4278f502 #define _JB_MAGIC_SETJMP_VFP 0x4278f503 /* Valid for all jmp_buf's */ #define _JB_MAGIC 0 #define _JB_REG_FPSCR 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 #define _JB_REG_D8 32 #define _JB_REG_D9 34 #define _JB_REG_D10 36 #define _JB_REG_D11 38 #define _JB_REG_D12 40 #define _JB_REG_D13 42 #define _JB_REG_D14 44 #define _JB_REG_D15 46 #ifndef __ASSEMBLER__ #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1]; #endif typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1]; #endif #endif /* !_MACHINE_SETJMP_H_ */
