1 files changed, 331 insertions, 0 deletions
diff --git a/arch/h8300/platform/h8s/entry.S b/arch/h8300/platform/h8s/entry.S
new file mode 100644
index 0000000..a7a53c8
--- /dev/null
+++ b/arch/h8300/platform/h8s/entry.S
@@ -0,0 +1,331 @@
+/* -*- mode: asm -*-
+ *
+ *  linux/arch/h8300/platform/h8s/entry.S
+ *
+ *  Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ *	fairly heavy changes to fix syscall args and signal processing
+ *	by David McCullough <davidm@snapgear.com>
+ */
+
+/*
+ *  entry.S
+ *  include exception/interrupt gateway
+ *          system call entry
+ */
+
+#include <linux/sys.h>
+#include <linux/config.h>
+#include <asm/unistd.h>
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/errno.h>
+
+	.h8300s
+
+/* CPU context save/restore macros. */
+	
+	.macro	SAVE_ALL
+	mov.l	er0,@-sp
+
+	stc	ccr,r0l				/* check kernel mode */
+	orc	#0x10,ccr
+	btst	#4,r0l
+	bne	5f
+
+	mov.l	sp,@SYMBOL_NAME(sw_usp)		/* user mode */
+	mov.l	@sp,er0
+	mov.l	@SYMBOL_NAME(sw_ksp),sp
+	sub.l	#(LRET-LORIG),sp		/* allocate LORIG - LRET */ 
+	stm.l	er0-er3,@-sp
+	mov.l	@SYMBOL_NAME(sw_usp),er0
+	mov.l	@(10:16,er0),er1		/* copy the RET addr */
+	mov.l	er1,@(LRET-LER3:16,sp)
+	mov.w	@(8:16,er0),r1
+	mov.w	r1,@(LEXR-LER3:16,sp)		/* copy EXR */
+
+	mov.w	e1,r1				/* e1 highbyte = ccr */
+	and	#0xef,r1h			/* mask mode? flag */
+	sub.w	r0,r0
+	mov.b	r1h,r0l
+	mov.w	r0,@(LCCR-LER3:16,sp)		/* copy ccr */
+	mov.l	@(LORIG-LER3:16,sp),er0
+	mov.l	er0,@(LER0-LER3:16,sp)		/* copy ER0 */
+	bra	6f
+5:
+	mov.l	@sp,er0				/* kernel mode */
+	subs	#2,sp				/* dummy ccr */
+	stm.l	er0-er3,@-sp
+	mov.w	@(LRET-LER3:16,sp),r1		/* copy old ccr */
+	mov.b	r1h,r1l
+	mov.b	#0,r1h
+	mov.w	r1,@(LCCR-LER3:16,sp)
+6:	
+	mov.l	er6,@-sp			/* syscall arg #6 */
+	mov.l	er5,@-sp			/* syscall arg #5 */
+	mov.l	er4,@-sp			/* syscall arg #4 */
+	.endm
+
+	.macro	RESTORE_ALL
+	mov.l	@sp+,er4
+	mov.l	@sp+,er5
+	mov.l	@sp+,er6
+	ldm.l	@sp+,er2-er3
+	mov.w	@(LCCR-LER1:16,sp),r0		/* check kernel mode */
+	btst	#4,r0l
+	bne	7f
+
+	orc	#0x80,ccr
+	mov.l	@SYMBOL_NAME(sw_usp),er0
+	mov.l	@(LER0-LER1:16,sp),er1		/* restore ER0 */
+	mov.l	er1,@er0
+	mov.w	@(LEXR-LER1:16,sp),r1		/* restore EXR */
+	mov.b	r1l,r1h
+	mov.w	r1,@(8:16,er0)
+	mov.w	@(LCCR-LER1:16,sp),r1		/* restore the RET addr */
+	mov.b	r1l,r1h
+	mov.b	@(LRET+1-LER1:16,sp),r1l
+	mov.w	r1,e1
+	mov.w	@(LRET+2-LER1:16,sp),r1
+	mov.l	er1,@(10:16,er0)
+
+	mov.l	@sp+,er1
+	add.l	#(LRET-LER1),sp			/* remove LORIG - LRET */ 
+	mov.l	sp,@SYMBOL_NAME(sw_ksp)
+	mov.l	er0,sp
+	bra	8f
+7:
+	mov.l	@sp+,er1
+	adds	#4,sp
+	adds	#2,sp
+8:
+	mov.l	@sp+,er0
+	adds	#4,sp				/* remove the sw created LVEC */
+	rte
+	.endm
+	
+.globl SYMBOL_NAME(system_call)
+.globl SYMBOL_NAME(ret_from_exception)
+.globl SYMBOL_NAME(ret_from_fork)
+.globl SYMBOL_NAME(ret_from_interrupt)
+.globl SYMBOL_NAME(interrupt_redirect_table)
+.globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp)
+.globl SYMBOL_NAME(resume)
+.globl SYMBOL_NAME(trace_break)
+.globl SYMBOL_NAME(interrupt_entry)
+		
+INTERRUPTS = 128
+#if defined(CONFIG_ROMKERNEL)
+	.section .int_redirect,"ax"
+SYMBOL_NAME_LABEL(interrupt_redirect_table)
+	.rept	7
+	.long	0
+	.endr
+	jsr	@SYMBOL_NAME(interrupt_entry)	/* NMI */
+	jmp	@SYMBOL_NAME(system_call)	/* TRAPA #0 (System call) */
+	.long	0
+	.long	0
+	jmp	@SYMBOL_NAME(trace_break)	/* TRAPA #3 (breakpoint) */
+	.rept	INTERRUPTS-12
+	jsr	@SYMBOL_NAME(interrupt_entry)
+	.endr
+#endif
+#if defined(CONFIG_RAMKERNEL)
+.globl SYMBOL_NAME(interrupt_redirect_table)
+	.section .bss
+SYMBOL_NAME_LABEL(interrupt_redirect_table)
+	.space	4
+#endif
+	
+	.section .text
+	.align	2
+SYMBOL_NAME_LABEL(interrupt_entry)
+	SAVE_ALL
+	mov.w	@(LCCR,sp),r0
+	btst	#4,r0l
+	bne	1f
+	mov.l	@SYMBOL_NAME(sw_usp),er0
+	mov.l	@(4:16,er0),er0
+	bra	2f
+1:
+	mov.l	@(LVEC:16,sp),er0
+2:
+#if defined(CONFIG_ROMKERNEL)
+	sub.l	#SYMBOL_NAME(interrupt_redirect_table),er0
+#endif
+#if defined(CONFIG_RAMKERNEL)
+	mov.l	@SYMBOL_NAME(interrupt_redirect_table),er1
+	sub.l	er1,er0
+#endif
+	shlr.l	#2,er0
+	dec.l	#1,er0
+	mov.l	sp,er1
+	subs	#4,er1				/* adjust ret_pc */
+	jsr	@SYMBOL_NAME(process_int)
+	mov.l	@SYMBOL_NAME(irq_stat)+CPUSTAT_SOFTIRQ_PENDING,er0
+	beq	1f
+	jsr	@SYMBOL_NAME(do_softirq)
+1:
+	jmp	@SYMBOL_NAME(ret_from_exception)
+
+SYMBOL_NAME_LABEL(system_call)
+	subs	#4,sp				/* dummy LVEC */
+	SAVE_ALL
+	mov.w	@(LCCR:16,sp),r1
+	bset	#4,r1l
+	ldc	r1l,ccr				/* restore ccr */
+	mov.l	er0,er4
+	mov.l	#-ENOSYS,er0
+	mov.l	er0,@(LER0:16,sp)
+
+	/* save top of frame */
+	mov.l	sp,er0
+	jsr	@SYMBOL_NAME(set_esp0)
+	cmp.l	#NR_syscalls,er4
+	bcc	SYMBOL_NAME(ret_from_exception):16
+	shll.l	#2,er4
+	mov.l	#SYMBOL_NAME(sys_call_table),er0
+	add.l	er4,er0
+	mov.l	@er0,er0
+	mov.l	er0,er4
+	beq	SYMBOL_NAME(ret_from_exception):16	
+	mov.l	sp,er2
+	and.w	#0xe000,r2
+	mov.b	@((TASK_FLAGS+3-(TIF_SYSCALL_TRACE >> 3)):16,er2),r2l
+	btst	#(TIF_SYSCALL_TRACE & 7),r2l
+	mov.l	@(LER1:16,sp),er0
+	mov.l	@(LER2:16,sp),er1
+	mov.l	@(LER3:16,sp),er2
+	jsr	@er4
+	mov.l	er0,@(LER0:16,sp)			/* save the return value */
+#if defined(CONFIG_SYSCALL_PRINT)
+	jsr	@SYMBOL_NAME(syscall_print)
+#endif
+	bra	SYMBOL_NAME(ret_from_exception):8
+1:
+	jsr	SYMBOL_NAME(syscall_trace)
+	mov.l	@(LER1:16,sp),er0
+	mov.l	@(LER2:16,sp),er1
+	mov.l	@(LER3:16,sp),er2
+	jsr	@er4
+	mov.l	er0,@(LER0:16,sp)		/* save the return value */
+	jsr	@SYMBOL_NAME(syscall_trace)
+	bra	SYMBOL_NAME(ret_from_exception):8
+
+SYMBOL_NAME_LABEL(ret_from_fork)
+	mov.l	er2,er0
+	jsr	@SYMBOL_NAME(schedule_tail)
+	bra	SYMBOL_NAME(ret_from_exception):8
+
+SYMBOL_NAME_LABEL(reschedule)
+	/* save top of frame */
+	mov.l	sp,er0
+	jsr	@SYMBOL_NAME(set_esp0)
+	jsr	@SYMBOL_NAME(schedule)
+
+SYMBOL_NAME_LABEL(ret_from_exception)
+#if defined(CONFIG_PREEMPT)
+	orc	#0x80,ccr
+#endif
+SYMBOL_NAME_LABEL(ret_from_interrupt)
+	mov.b	@(LCCR+1:16,sp),r0l
+	btst	#4,r0l			/* check if returning to kernel */
+	bne	done:8			/* if so, skip resched, signals */
+	andc	#0x7f,ccr
+	mov.l	sp,er4
+	and.w	#0xe000,r4
+	mov.l	@(TI_FLAGS:16,er4),er1
+	and.l	#_TIF_WORK_MASK,er1
+	beq	done:8
+1:
+	mov.l	@(TI_FLAGS:16,er4),er1
+	btst	#TIF_NEED_RESCHED,r1l
+	bne	SYMBOL_NAME(reschedule):16
+	mov.l	sp,er0
+	subs	#4,er0			/* adjust retpc */
+	mov.l	er2,er1
+	jsr	@SYMBOL_NAME(do_signal)
+#if defined(CONFIG_PREEMPT)
+	bra	done:8			/* userspace thoru */
+3:
+	btst	#4,r0l
+	beq	done:8			/* userspace thoru */
+4:
+	mov.l	@(TI_PRE_COUNT:16,er4),er1
+	bne	done:8
+	mov.l	@(TI_FLAGS:16,er4),er1
+	btst	#TIF_NEED_RESCHED,r1l
+	beq	done:8
+	mov.b	r0l,r0l
+	bpl	done:8			/* interrupt off (exception path?) */
+	mov.l	#PREEMPT_ACTIVE,er1
+	mov.l	er1,@(TI_PRE_COUNT:16,er4)
+	andc	#0x7f,ccr
+	jsr	@SYMBOL_NAME(schedule)
+	sub.l	er1,er1
+	mov.l	er1,@(TI_PRE_COUNT:16,er4)
+	orc	#0x80,ccr
+	bra	4b:8
+#endif
+done:
+	RESTORE_ALL			/* Does RTE */
+
+SYMBOL_NAME_LABEL(resume)
+	/*
+	 *	er0 = prev
+	 *	er1 = next
+	 *	return last in er2
+	 */
+
+	/* save sr */
+	sub.w	r3,r3
+	stc	ccr,r3l
+	stc	exr,r3h
+	mov.w	r3,@(THREAD_CCR+2:16,er0)
+
+	/* disable interrupts */
+	orc	#0x80,ccr
+	mov.l	@SYMBOL_NAME(sw_usp),er3
+	mov.l	er3,@(THREAD_USP:16,er0)
+	mov.l	sp,@(THREAD_KSP:16,er0)
+	
+	/* Skip address space switching if they are the same. */
+	/* FIXME: what did we hack out of here, this does nothing! */
+
+	mov.l	@(THREAD_USP:16,er1),er0
+	mov.l	er0,@SYMBOL_NAME(sw_usp)
+	mov.l	@(THREAD_KSP:16,er1),sp
+			
+	/* restore status register */
+	mov.w	@(THREAD_CCR+2:16,er1),r3
+
+	ldc	r3l,ccr
+	ldc	r3h,exr
+
+	rts
+
+SYMBOL_NAME_LABEL(trace_break)
+	subs	#4,sp			/* dummy LVEC */
+	SAVE_ALL
+	sub.l	er1,er1
+	dec.l	#1,er1
+	mov.l	er1,@(LORIG,sp)	
+	mov.l	sp,er0
+	jsr	@SYMBOL_NAME(set_esp0)
+	mov.l	@SYMBOL_NAME(sw_usp),er0
+	mov.l	@er0,er1
+	subs	#2,er1
+	mov.l	er1,@er0	
+	and.w	#0xff,e1
+	mov.l	er1,er0
+	jsr	@SYMBOL_NAME(trace_trap)
+	jmp	@SYMBOL_NAME(ret_from_exception)	
+
+	.section	.bss
+SYMBOL_NAME_LABEL(sw_ksp)
+	.space	4	
+SYMBOL_NAME_LABEL(sw_usp)
+	.space	4