patch-2.1.43 linux/include/asm-m68k/entry.h

• Lines: 177
• Date: Thu Jun 12 16:22:10 1997
• Orig file: v2.1.42/linux/include/asm-m68k/entry.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.42/linux/include/asm-m68k/entry.h linux/include/asm-m68k/entry.h
@@ -0,0 +1,176 @@
+#ifndef __M68K_ENTRY_H
+#define __M68K_ENTRY_H
+
+#include <linux/config.h>
+#include <asm/setup.h>
+#ifdef CONFIG_KGDB
+#include <asm/kgdb.h>
+#endif
+
+/*
+ * Stack layout in 'ret_from_exception':
+ *
+ *	This allows access to the syscall arguments in registers d1-d5
+ *
+ *	 0(sp) - d1
+ *	 4(sp) - d2
+ *	 8(sp) - d3
+ *	 C(sp) - d4
+ *	10(sp) - d5
+ *	14(sp) - a0
+ *	18(sp) - a1
+ *	1C(sp) - a2
+ *	20(sp) - d0
+ *	24(sp) - orig_d0
+ *	28(sp) - stack adjustment
+ *	2C(sp) - sr
+ *	2E(sp) - pc
+ *	32(sp) - format & vector
+ */
+
+/*
+ * 97/05/14 Andreas: Register %a2 is now set to the current task throughout
+ *		     the whole kernel.
+ */
+
+#ifdef __ASSEMBLY__
+
+#define curptr a2
+
+/*
+ * these are offsets into the task-struct
+ */
+LTASK_STATE	=  0
+LTASK_COUNTER	=  4
+LTASK_PRIORITY	=  8
+LTASK_SIGNAL	= 12
+LTASK_BLOCKED	= 16
+LTASK_FLAGS	= 20
+
+LTSS_KSP	= 0
+LTSS_USP	= 4
+LTSS_SR		= 8
+LTSS_FS		= 10
+LTSS_CRP	= 12
+LTSS_FPCTXT	= 24
+
+/* the following macro is used when enabling interrupts */
+#if defined(MACH_ATARI_ONLY)
+	/* block out HSYNC on the atari */
+#define ALLOWINT 0xfbff
+#define	MAX_NOINT_IPL	3
+#else
+	/* portable version */
+#define ALLOWINT 0xf8ff
+#define	MAX_NOINT_IPL	0
+#endif /* machine compilation types */ 
+
+LPT_OFF_D0	  = 0x20
+LPT_OFF_ORIG_D0	  = 0x24
+LPT_OFF_SR	  = 0x2C
+LPT_OFF_FORMATVEC = 0x32
+
+LFLUSH_I_AND_D = 0x00000808
+LENOSYS = 38
+LSIGTRAP = 5
+
+LPF_TRACESYS_OFF = 3
+LPF_TRACESYS_BIT = 5
+LPF_PTRACED_OFF = 3
+LPF_PTRACED_BIT = 4
+LPF_DTRACE_OFF = 1
+LPF_DTRACE_BIT = 5
+
+/*
+ * This defines the normal kernel pt-regs layout.
+ *
+ * regs a3-a6 and d6-d7 are preserved by C code
+ * the kernel doesn't mess with usp unless it needs to
+ */
+#ifndef CONFIG_KGDB
+/*
+ * a -1 in the orig_d0 field signifies
+ * that the stack frame is NOT for syscall
+ */
+#define SAVE_ALL_INT				\
+	clrl	%sp@-;		/* stk_adj */	\
+	pea	-1:w;		/* orig d0 */	\
+	movel	%d0,%sp@-;	/* d0 */	\
+	moveml	%d1-%d5/%a0-%a1/%curptr,%sp@-
+
+#define SAVE_ALL_SYS				\
+	clrl	%sp@-;		/* stk_adj */	\
+	movel	%d0,%sp@-;	/* orig d0 */	\
+	movel	%d0,%sp@-;	/* d0 */	\
+	moveml  %d1-%d5/%a0-%a1/%curptr,%sp@-
+#else
+/* Need to save the "missing" registers for kgdb...
+ */
+#define SAVE_ALL_INT					\
+	clrl	%sp@-;		/* stk_adj */		\
+	pea	-1:w;		/* orig d0 */		\
+	movel	%d0,%sp@-;	/* d0 */		\
+	moveml	%d1-%d5/%a0-%a1/%curptr,%sp@-;		\
+	moveml	%d6-%d7,kgdb_registers+GDBOFFA_D6;	\
+	moveml	%a3-%a6,kgdb_registers+GDBOFFA_A3
+
+#define SAVE_ALL_SYS					\
+	clrl	%sp@-;		/* stk_adj */		\
+	movel	%d0,%sp@-;	/* orig d0 */		\
+	movel	%d0,%sp@-;	/* d0 */		\
+	moveml	%d1-%d5/%a0-%a1/%curptr,%sp@-;		\
+	moveml	%d6-%d7,kgdb_registers+GDBOFFA_D6;	\
+	moveml	%a3-%a6,kgdb_registers+GDBOFFA_A3
+#endif
+
+#define RESTORE_ALL			\
+	moveml	%sp@+,%a0-%a1/%curptr/%d1-%d5;	\
+	movel	%sp@+,%d0;		\
+	addql	#4,%sp;	 /* orig d0 */	\
+	addl	%sp@+,%sp; /* stk adj */	\
+	rte
+
+#define SWITCH_STACK_SIZE (6*4+4)	/* includes return address */
+
+#define SAVE_SWITCH_STACK \
+	moveml	%a3-%a6/%d6-%d7,%sp@-
+
+#define RESTORE_SWITCH_STACK \
+	moveml	%sp@+,%a3-%a6/%d6-%d7
+
+#define GET_CURRENT(tmp) \
+	movel	%sp,tmp; \
+	andw	&-8192,tmp; \
+	movel	tmp,%curptr;
+
+#else /* C source */
+
+#define STR(X) STR1(X)
+#define STR1(X) #X
+
+#define PT_OFF_ORIG_D0	 0x24
+#define PT_OFF_FORMATVEC 0x32
+#define PT_OFF_SR	 0x2C
+#ifndef CONFIG_KGDB
+#define SAVE_ALL_INT				\
+	"clrl	%%sp@-;"    /* stk_adj */	\
+	"pea	-1:w;"	    /* orig d0 = -1 */	\
+	"movel	%%d0,%%sp@-;" /* d0 */		\
+	"moveml	%%d1-%%d5/%%a0-%%a2,%%sp@-"
+#else
+#define SAVE_ALL_INT				\
+	"clrl	%%sp@-\n\t" /* stk_adj */	\
+	"pea	-1:w\n\t"   /* orig d0 = -1 */	\
+	"movel	%%d0,%%sp@-\n\t" /* d0 */	\
+	"moveml	%%d1-%%d5/%%a0-%%a2,%%sp@-\n\t"	\
+	"moveml	%%d6-%%d7,kgdb_registers+"STR(GDBOFFA_D6)"\n\t" \
+	"moveml	%%a3-%%a6,kgdb_registers+"STR(GDBOFFA_A3)
+#endif
+#define GET_CURRENT(tmp) \
+	"movel	%%sp,"#tmp"\n\t" \
+	"andw	#-8192,"#tmp"\n\t" \
+	"movel	"#tmp",%%a2"
+
+#endif
+
+#endif /* __M68K_ENTRY_H */