diff options
Diffstat (limited to 'sys/arm/include/setjmp.h')
-rw-r--r-- | sys/arm/include/setjmp.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/sys/arm/include/setjmp.h b/sys/arm/include/setjmp.h new file mode 100644 index 000000000000..2090c5d15f40 --- /dev/null +++ b/sys/arm/include/setjmp.h @@ -0,0 +1,107 @@ +/* $NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $ */ +/* $FreeBSD$ */ + +/* + * 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 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_ */ |