Import of Linux/MIPS 1.3.0

1 files changed, 554 insertions, 0 deletions

diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
new file mode 100644
index 000000000..b54ea220b
--- /dev/null
+++ b/arch/alpha/kernel/entry.S
@@ -0,0 +1,554 @@
+/*
+ * alpha/entry.S
+ *
+ * kernel entry-points
+ */
+
+#include <asm/system.h>
+
+#define halt	.long PAL_halt
+#define rti	.long PAL_rti
+
+#define NR_SYSCALLS 310
+#define osf_vfork sys_fork
+
+/*
+ * These offsets must match with "struct hae" in io.h:	
+ */
+#define HAE_CACHE	0
+#define HAE_REG		8
+
+/*
+ * stack offsets
+ */
+#define SP_OFF		160
+
+#define SWITCH_STACK_SIZE 320
+
+/*
+ * task structure offsets
+ */
+#define TASK_STATE	0
+#define TASK_COUNTER	8
+#define TASK_PRIORITY	16
+#define TASK_SIGNAL	24
+#define TASK_BLOCKED	32
+#define TASK_FLAGS	40
+
+/*
+ * This defines the normal kernel pt-regs layout.
+ *
+ * regs 9-15 preserved by C code
+ * regs 16-18 saved by PAL-code
+ * regs 29-30 saved and set up by PAL-code
+ */
+#define SAVE_ALL			\
+	subq	$30,160,$30;		\
+	stq	$0,0($30);		\
+	stq	$1,8($30);		\
+	stq	$2,16($30);		\
+	stq	$3,24($30);		\
+	stq	$4,32($30);		\
+	stq	$5,40($30);		\
+	stq	$6,48($30);		\
+	stq	$7,56($30);		\
+	stq	$8,64($30);		\
+	stq	$19,72($30);		\
+	stq	$20,80($30);		\
+	stq	$21,88($30);		\
+	stq	$22,96($30);		\
+	stq	$23,104($30);		\
+	stq	$24,112($30);		\
+	stq	$25,120($30);		\
+	stq	$26,128($30);		\
+	stq	$27,136($30);		\
+	stq	$28,144($30);		\
+	lda	$2,hae;			\
+	ldq	$2,HAE_CACHE($2);	\
+	stq	$2,152($30)
+
+#define RESTORE_ALL			\
+	lda	$8,hae;			\
+	ldq	$7,HAE_CACHE($8);	\
+	ldq	$6,152($30);		\
+	subq	$7,$6,$5;		\
+	beq	$5,99f;			\
+	ldq	$7,HAE_REG($8);		\
+	addq	$31,7,$16;		\
+	call_pal PAL_swpipl;		\
+	stq	$6,HAE_CACHE($8);	\
+	stq	$6,0($7);		\
+	mb;				\
+	bis	$0,$0,$16;		\
+	call_pal PAL_swpipl;		\
+99:;					\
+	ldq	$0,0($30);		\
+	ldq	$1,8($30);		\
+	ldq	$2,16($30);		\
+	ldq	$3,24($30);		\
+	ldq	$4,32($30);		\
+	ldq	$5,40($30);		\
+	ldq	$6,48($30);		\
+	ldq	$7,56($30);		\
+	ldq	$8,64($30);		\
+	ldq	$19,72($30);		\
+	ldq	$20,80($30);		\
+	ldq	$21,88($30);		\
+	ldq	$22,96($30);		\
+	ldq	$23,104($30);		\
+	ldq	$24,112($30);		\
+	ldq	$25,120($30);		\
+	ldq	$26,128($30);		\
+	ldq	$27,136($30);		\
+	ldq	$28,144($30);		\
+	addq	$30,160,$30
+
+.text
+.set noat
+
+.align 3
+.globl	entInt
+.ent	entInt
+entInt:
+	SAVE_ALL
+/* start atomic operation with respect to software interrupts */
+	lda	$0,intr_count
+	ldq	$1,0($0)
+	addq	$1,1,$1
+	stq	$1,0($0)
+/* set up the arguments to the C interrupt handler */
+	lda	$27,do_entInt
+	jsr	$26,($27),do_entInt
+/* ok, check if we need to do software interrupts */
+1:	lda	$0,intr_count
+	ldq	$1,0($0)
+	subq	$1,1,$1
+	bne	$1,2f		/* interrupt within interrupt: return now */
+	lda	$2,bh_active
+	ldq	$3,0($2)
+	lda	$2,bh_mask
+	ldq	$2,0($2)
+	and	$2,$3,$2
+	bne	$2,3f
+	stq	$1,0($0)
+	br	$31,ret_from_sys_call
+.align 3
+2:	stq	$1,0($0)
+	br	$31,restore_all
+.align 3
+3:	lda	$27,do_bottom_half
+	jsr	$26,($27),do_bottom_half
+	br	$31,1b
+.end entInt
+
+.align 3
+.globl	entMM
+.ent	entMM
+entMM:
+	SAVE_ALL
+	lda	$27,do_page_fault
+	lda	$26,ret_from_sys_call
+	jsr	$31,($27),do_page_fault
+.end entMM
+
+.align 3
+.globl	entArith
+.ent	entArith
+entArith:
+	SAVE_ALL
+	lda	$27,do_entArith
+	lda	$26,ret_from_sys_call
+	jsr	$31,($27),do_entArith
+.end entArith
+
+.align 3
+.globl	entIF
+.ent	entIF
+entIF:
+	SAVE_ALL
+	lda	$27,do_entIF
+	lda	$26,ret_from_sys_call
+	jsr	$31,($27),do_entIF
+.end entIF
+
+/*
+ * Fork() is one of the special system calls: it needs to
+ * save the callee-saved regs so that the regs can be found
+ * for the new process.. We save them in the "context switch"
+ * stack format (see arch/alpha/kernel/process.c).
+ *
+ * Also, for the kernel fork, we need to fake the system call
+ * stack buildup, as we can't do system calls from kernel space.
+ */
+.align 3
+.globl	kernel_fork
+.ent	kernel_fork
+kernel_fork:
+	subq $30,6*8,$30
+	stq $31,0($30)
+	stq $26,8($30)
+	stq $29,16($30)
+	stq $16,24($30)
+	stq $17,32($30)
+	stq $18,40($30)
+	SAVE_ALL
+	lda $27,sys_fork
+	jsr $26,($27),sys_fork
+	br ret_from_sys_call
+.end	kernel_fork
+
+.align 3
+.ent	do_switch_stack
+do_switch_stack:
+	lda $30,-SWITCH_STACK_SIZE($30)
+	stq  $9,0($30)
+	stq $10,8($30)
+	stq $11,16($30)
+	stq $12,24($30)
+	stq $13,32($30)
+	stq $14,40($30)
+	stq $15,48($30)
+	stq $26,56($30)
+	stt $f0,64($30)
+	stt $f1,72($30)
+	stt $f2,80($30)
+	stt $f3,88($30)
+	stt $f4,96($30)
+	stt $f5,104($30)
+	stt $f6,112($30)
+	stt $f7,120($30)
+	stt $f8,128($30)
+	stt $f9,136($30)
+	stt $f10,144($30)
+	stt $f11,152($30)
+	stt $f12,160($30)
+	stt $f13,168($30)
+	stt $f14,176($30)
+	stt $f15,184($30)
+	stt $f16,192($30)
+	stt $f17,200($30)
+	stt $f18,208($30)
+	stt $f19,216($30)
+	stt $f20,224($30)
+	stt $f21,232($30)
+	stt $f22,240($30)
+	stt $f23,248($30)
+	stt $f24,256($30)
+	stt $f25,264($30)
+	stt $f26,272($30)
+	stt $f27,280($30)
+	stt $f28,288($30)
+	stt $f29,296($30)
+	stt $f30,304($30)
+	ret $31,($0),1
+.end do_switch_stack
+
+.align 3
+.ent	undo_switch_stack
+undo_switch_stack:
+	ldq  $9,0($30)
+	ldq $10,8($30)
+	ldq $11,16($30)
+	ldq $12,24($30)
+	ldq $13,32($30)
+	ldq $14,40($30)
+	ldq $15,48($30)
+	ldq $26,56($30)
+	ldt $f0,64($30)
+	ldt $f1,72($30)
+	ldt $f2,80($30)
+	ldt $f3,88($30)
+	ldt $f4,96($30)
+	ldt $f5,104($30)
+	ldt $f6,112($30)
+	ldt $f7,120($30)
+	ldt $f8,128($30)
+	ldt $f9,136($30)
+	ldt $f10,144($30)
+	ldt $f11,152($30)
+	ldt $f12,160($30)
+	ldt $f13,168($30)
+	ldt $f14,176($30)
+	ldt $f15,184($30)
+	ldt $f16,192($30)
+	ldt $f17,200($30)
+	ldt $f18,208($30)
+	ldt $f19,216($30)
+	ldt $f20,224($30)
+	ldt $f21,232($30)
+	ldt $f22,240($30)
+	ldt $f23,248($30)
+	ldt $f24,256($30)
+	ldt $f25,264($30)
+	ldt $f26,272($30)
+	ldt $f27,280($30)
+	ldt $f28,288($30)
+	ldt $f29,296($30)
+	ldt $f30,304($30)
+	lda $30,SWITCH_STACK_SIZE($30)
+	ret $31,($0),1
+.end undo_switch_stack
+
+.align 3
+.globl	entUna
+.ent	entUna
+entUna:
+	lda $30,-256($30)
+	stq $0,0($30)
+	stq $1,8($30)
+	stq $2,16($30)
+	stq $3,24($30)
+	stq $4,32($30)
+	stq $5,40($30)
+	stq $6,48($30)
+	stq $7,56($30)
+	stq $8,64($30)
+	stq $9,72($30)
+	stq $10,80($30)
+	stq $11,88($30)
+	stq $12,96($30)
+	stq $13,104($30)
+	stq $14,112($30)
+	stq $15,120($30)
+	/* 16-18 PAL-saved */
+	stq $19,152($30)
+	stq $20,160($30)
+	stq $21,168($30)
+	stq $22,176($30)
+	stq $23,184($30)
+	stq $24,192($30)
+	stq $25,200($30)
+	stq $26,208($30)
+	stq $27,216($30)
+	stq $28,224($30)
+	stq $29,232($30)
+	stq $30,240($30)
+	stq $31,248($30)
+	lda $27,do_entUna
+	jsr $26,($27),do_entUna
+	ldq $0,0($30)
+	ldq $1,8($30)
+	ldq $2,16($30)
+	ldq $3,24($30)
+	ldq $4,32($30)
+	ldq $5,40($30)
+	ldq $6,48($30)
+	ldq $7,56($30)
+	ldq $8,64($30)
+	ldq $9,72($30)
+	ldq $10,80($30)
+	ldq $11,88($30)
+	ldq $12,96($30)
+	ldq $13,104($30)
+	ldq $14,112($30)
+	ldq $15,120($30)
+	/* 16-18 PAL-saved */
+	ldq $19,152($30)
+	ldq $20,160($30)
+	ldq $21,168($30)
+	ldq $22,176($30)
+	ldq $23,184($30)
+	ldq $24,192($30)
+	ldq $25,200($30)
+	ldq $26,208($30)
+	ldq $27,216($30)
+	ldq $28,224($30)
+	ldq $29,232($30)
+	ldq $30,240($30)
+	lda $30,256($30)
+	rti
+.end entUna
+
+.align 3
+.globl	sys_fork
+.ent	sys_fork
+sys_fork:
+	br $0,do_switch_stack
+	bis $30,$30,$16
+	lda $27,alpha_fork
+	jsr $26,($27),alpha_fork
+	br $0,undo_switch_stack
+	ldq $0,0($30)
+	ret $31,($26),1
+.end	sys_fork
+
+.align 3
+.globl  alpha_switch_to
+.ent    alpha_switch_to
+alpha_switch_to:
+	br $0,do_switch_stack
+	call_pal PAL_swpctx
+	br $0,undo_switch_stack
+	ret $31,($26),1
+.end alpha_switch_to
+
+/*
+ * Oh, well.. Disassembling OSF/1 binaries to find out how the
+ * system calls work isn't much fun.
+ *
+ * entSys is special in that the PAL-code doesn't save a0-a2, so
+ * we start off by doing that by hand.
+ */
+.align 3
+.globl	entSys
+.globl	ret_from_sys_call
+.ent	entSys
+entSys:
+	stq	$16,24($30)
+	stq	$17,32($30)
+	stq	$18,40($30)
+	SAVE_ALL
+	lda	$1,NR_SYSCALLS($31)
+	lda	$2,sys_call_table
+	lda	$27,do_entSys
+	cmpult	$0,$1,$1
+	s8addq	$0,$2,$2
+	beq	$1,1f
+	ldq	$27,0($2)
+1:	jsr	$26,($27),do_entSys
+	bis	$31,$31,$1
+	bge	$0,2f
+	bis	$31,$31,$26	/* tell "ret_from_sys_call" that we can restart */
+	ldq	$19,0($30)	/* .. with this syscall nr */
+	ldq	$20,72($30)	/* .. and this a3 */
+	addq	$31,1,$1	/* set a3 for errno return */
+	subq	$31,$0,$0	/* with error in v0 */
+2:	stq	$0,0($30)
+	stq	$1,72($30)	/* a3 for return */
+.align 3
+ret_from_sys_call:
+	ldq	$0,SP_OFF($30)
+	cmovne	$26,0,$19
+	and	$0,8,$0
+	beq	$0,restore_all
+ret_from_reschedule:
+	lda	$0,need_resched
+	lda	$1,current
+	ldl	$2,0($0)
+	lda	$4,init_task
+	ldq	$3,0($1)
+	bne	$2,reschedule
+	subq	$4,$3,$4
+	beq	$4,restore_all
+	ldq	$4,TASK_SIGNAL($3)
+	ldq	$16,TASK_BLOCKED($3)
+	bic	$4,$16,$4
+	bne	$4,signal_return
+restore_all:
+	RESTORE_ALL
+	rti
+.align 3
+signal_return:
+	bis	$30,$30,$17
+	br	$0,do_switch_stack
+	bis	$30,$30,$18
+	lda	$27,do_signal
+	jsr	$26,($27),do_signal
+	lda	$30,SWITCH_STACK_SIZE($30)
+	br	$31,restore_all
+.end entSys
+
+.align 3
+.ent reschedule
+reschedule:
+	subq	$30,16,$30
+	stq	$19,0($30)
+	stq	$20,8($30)
+	lda	$27,schedule
+	jsr	$26,($27),schedule
+	ldq	$19,0($30)
+	ldq	$20,8($30)
+	addq	$30,16,$30
+	br	$31,ret_from_reschedule
+.end reschedule
+
+.align 3
+.ent sys_sigreturn
+sys_sigreturn:
+	bis	$30,$30,$17
+	lda	$30,-SWITCH_STACK_SIZE($30)
+	bis	$30,$30,$18
+	lda	$27,do_sigreturn
+	jsr	$26,($27),do_sigreturn
+	br	$0,undo_switch_stack
+	br	$31,ret_from_sys_call
+.end sys_sigreturn
+
+.align 3
+.ent sys_sigsuspend
+sys_sigsuspend:
+	bis	$30,$30,$17
+	br	$0,do_switch_stack
+	bis	$30,$30,$18
+	lda	$27,do_sigsuspend
+	jsr	$26,($27),do_sigsuspend
+	lda	$30,SWITCH_STACK_SIZE($30)
+	br	$31,ret_from_sys_call
+.end sys_sigreturn
+
+	.align 3
+	.globl sys_call_table
+sys_call_table:
+/*0*/	.quad do_entSys, sys_exit, sys_fork, sys_read, sys_write
+	.quad do_entSys, sys_close, sys_wait4, do_entSys, sys_link
+	.quad sys_unlink, do_entSys, sys_chdir, sys_fchdir, sys_mknod
+	.quad sys_chmod, sys_chown, sys_brk, do_entSys, sys_lseek
+	.quad sys_getxpid, osf_mount, osf_umount, sys_setuid, sys_getxuid
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, sys_access, do_entSys
+	.quad do_entSys, sys_sync, sys_kill, do_entSys, sys_setpgid
+	.quad do_entSys, sys_dup, sys_pipe, do_entSys, do_entSys
+	.quad sys_open, do_entSys, sys_getxgid, osf_sigprocmask, do_entSys
+/*50*/	.quad do_entSys, do_entSys, do_entSys, do_entSys, sys_ioctl
+	.quad do_entSys, do_entSys, sys_symlink, sys_readlink, sys_execve
+	.quad sys_umask, do_entSys, do_entSys, sys_getpgrp, sys_getpagesize
+	.quad do_entSys, osf_vfork, sys_newstat, sys_newlstat, do_entSys
+	.quad do_entSys, osf_mmap, do_entSys, sys_munmap, sys_mprotect
+	.quad sys_madvise, do_entSys, do_entSys, do_entSys, sys_getgroups
+	.quad do_entSys, do_entSys, do_entSys, sys_setitimer, do_entSys
+	.quad do_entSys, sys_getitimer, sys_gethostname, do_entSys, sys_getdtablesize
+	.quad sys_dup2, sys_newfstat, sys_fcntl, sys_select, do_entSys
+	.quad sys_fsync, do_entSys, sys_socket, do_entSys, do_entSys
+/*100*/	.quad do_entSys, do_entSys, do_entSys, sys_sigreturn, sys_bind
+	.quad do_entSys, sys_listen, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, sys_sigsuspend, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, sys_gettimeofday, sys_getrusage, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, sys_settimeofday, sys_fchown, sys_fchmod
+	.quad do_entSys, sys_setreuid, sys_setregid, sys_rename, sys_truncate
+	.quad sys_ftruncate, do_entSys, sys_setgid, do_entSys, do_entSys
+	.quad do_entSys, sys_mkdir, sys_rmdir, sys_utimes, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, sys_getrlimit
+	.quad sys_setrlimit, do_entSys, sys_setsid, do_entSys, do_entSys
+/*150*/	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, sys_sigaction, do_entSys, do_entSys, osf_getdirentries
+	.quad osf_statfs, osf_fstatfs, do_entSys, do_entSys, do_entSys
+	.quad osf_getdomainname, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, osf_swapon
+/*200*/	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, osf_utsname, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+/*250*/	.quad do_entSys, osf_usleep_thread, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys
+/* linux-specific system calls start at 300 */
+/*300*/	.quad sys_bdflush, sys_sethae, do_entSys, do_entSys, do_entSys
+	.quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys