Merge dorothy.sfbay.redhat.com:/dorothy/rth/linux/linus-2.5

into dorothy.sfbay.redhat.com:/dorothy/rth/linux/axp-2.5

arch/alpha/kernel/alpha_ksyms.c

@@ -144,7 +144,6 @@ EXPORT_SYMBOL(pci_dac_dma_to_offset);
 EXPORT_SYMBOL(dump_thread);
 EXPORT_SYMBOL(dump_fpu);
 EXPORT_SYMBOL(hwrpb);
-EXPORT_SYMBOL(wrusp);
 EXPORT_SYMBOL(start_thread);
 EXPORT_SYMBOL(alpha_read_fp_reg);
 EXPORT_SYMBOL(alpha_read_fp_reg_s);

arch/alpha/kernel/entry.S

 /*
- * alpha/entry.S
+ * arch/alpha/kernel/entry.S
  *
- * kernel entry-points
+ * Kernel entry-points.
  */
 
 #include <linux/config.h>
@@ -11,9 +11,10 @@
 #include <asm/thread_info.h>
 #include <asm/unistd.h>
 
-/*
- * stack offsets
- */
+	.text
+	.set noat
+
+/* Stack offsets.  */
 #define SP_OFF			184
 #define SWITCH_STACK_SIZE	320
 
@@ -28,145 +29,578 @@
  */
 
 #define SAVE_ALL			\
-	subq	$30,SP_OFF,$30;		\
-	stq	$0,0($30);		\
-	stq	$1,8($30);		\
-	stq	$2,16($30);		\
-	stq	$3,24($30);		\
-	stq	$4,32($30);		\
-	stq	$28,144($30);		\
-	lda	$2,alpha_mv;		\
-	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);		\
-	ldq	$2,HAE_CACHE($2);	\
-	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	$2,152($30);		\
-	stq	$16,160($30);		\
-	stq	$17,168($30);		\
-	stq	$18,176($30)
+	subq	$sp, SP_OFF, $sp;	\
+	stq	$0, 0($sp);		\
+	stq	$1, 8($sp);		\
+	stq	$2, 16($sp);		\
+	stq	$3, 24($sp);		\
+	stq	$4, 32($sp);		\
+	stq	$28, 144($sp);		\
+	lda	$2, alpha_mv;		\
+	stq	$5, 40($sp);		\
+	stq	$6, 48($sp);		\
+	stq	$7, 56($sp);		\
+	stq	$8, 64($sp);		\
+	stq	$19, 72($sp);		\
+	stq	$20, 80($sp);		\
+	stq	$21, 88($sp);		\
+	ldq	$2, HAE_CACHE($2);	\
+	stq	$22, 96($sp);		\
+	stq	$23, 104($sp);		\
+	stq	$24, 112($sp);		\
+	stq	$25, 120($sp);		\
+	stq	$26, 128($sp);		\
+	stq	$27, 136($sp);		\
+	stq	$2, 152($sp);		\
+	stq	$16, 160($sp);		\
+	stq	$17, 168($sp);		\
+	stq	$18, 176($sp)
 
 #define RESTORE_ALL			\
-	lda	$19,alpha_mv;		\
-	ldq	$0,0($30);		\
-	ldq	$1,8($30);		\
-	ldq	$2,16($30);		\
-	ldq	$3,24($30);		\
-	ldq	$21,152($30);		\
-	ldq	$20,HAE_CACHE($19);	\
-	ldq	$4,32($30);		\
-	ldq	$5,40($30);		\
-	ldq	$6,48($30);		\
-	ldq	$7,56($30);		\
-	subq	$20,$21,$20;		\
-	ldq	$8,64($30);		\
-	beq	$20,99f;		\
-	ldq	$20,HAE_REG($19);	\
-	stq	$21,HAE_CACHE($19);	\
-	stq	$21,0($20);		\
-	ldq	$0,0($30);		\
-	ldq	$1,8($30);		\
+	lda	$19, alpha_mv;		\
+	ldq	$0, 0($sp);		\
+	ldq	$1, 8($sp);		\
+	ldq	$2, 16($sp);		\
+	ldq	$3, 24($sp);		\
+	ldq	$21, 152($sp);		\
+	ldq	$20, HAE_CACHE($19);	\
+	ldq	$4, 32($sp);		\
+	ldq	$5, 40($sp);		\
+	ldq	$6, 48($sp);		\
+	ldq	$7, 56($sp);		\
+	subq	$20, $21, $20;		\
+	ldq	$8, 64($sp);		\
+	beq	$20, 99f;		\
+	ldq	$20, HAE_REG($19);	\
+	stq	$21, HAE_CACHE($19);	\
+	stq	$21, 0($20);		\
+	ldq	$0, 0($sp);		\
+	ldq	$1, 8($sp);		\
 99:;					\
-	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,SP_OFF,$30
-
-.text
-.set noat
-
-.align 3
-.globl	entInt
-.ent	entInt
+	ldq	$19, 72($sp);		\
+	ldq	$20, 80($sp);		\
+	ldq	$21, 88($sp);		\
+	ldq	$22, 96($sp);		\
+	ldq	$23, 104($sp);		\
+	ldq	$24, 112($sp);		\
+	ldq	$25, 120($sp);		\
+	ldq	$26, 128($sp);		\
+	ldq	$27, 136($sp);		\
+	ldq	$28, 144($sp);		\
+	addq	$sp, SP_OFF, $sp
+
+/*
+ * Non-syscall kernel entry points.
+ */
+
+	.align	4
+	.globl	entInt
+	.ent	entInt
 entInt:
 	SAVE_ALL
-	lda	$8,0x3fff
-	lda	$26,ret_from_sys_call
-	bic	$30,$8,$8
-	jsr	$31,do_entInt
+	lda	$8, 0x3fff
+	lda	$26, ret_from_sys_call
+	bic	$sp, $8, $8
+	mov	$sp, $19
+	jsr	$31, do_entInt
 .end entInt
 
-.align 3
-.globl	entMM
-.ent	entMM
+	.align	4
+	.globl	entArith
+	.ent	entArith
+entArith:
+	SAVE_ALL
+	lda	$8, 0x3fff
+	lda	$26, ret_from_sys_call
+	bic	$sp, $8, $8
+	mov	$sp, $18
+	jsr	$31, do_entArith
+.end entArith
+
+	.align	4
+	.globl	entMM
+	.ent	entMM
 entMM:
 	SAVE_ALL
 /* save $9 - $15 so the inline exception code can manipulate them.  */
-	subq	$30,56,$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)
-	addq	$30,56,$19
+	subq	$sp, 56, $sp
+	stq	$9, 0($sp)
+	stq	$10, 8($sp)
+	stq	$11, 16($sp)
+	stq	$12, 24($sp)
+	stq	$13, 32($sp)
+	stq	$14, 40($sp)
+	stq	$15, 48($sp)
+	addq	$sp, 56, $19
 /* handle the fault */
-	lda	$8,0x3fff
-	bic	$30,$8,$8
-	jsr	$26,do_page_fault
+	lda	$8, 0x3fff
+	bic	$sp, $8, $8
+	jsr	$26, do_page_fault
 /* reload the registers after the exception code played.  */
-	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)
-	addq	$30,56,$30
+	ldq	$9, 0($sp)
+	ldq	$10, 8($sp)
+	ldq	$11, 16($sp)
+	ldq	$12, 24($sp)
+	ldq	$13, 32($sp)
+	ldq	$14, 40($sp)
+	ldq	$15, 48($sp)
+	addq	$sp, 56, $sp
 /* finish up the syscall as normal.  */
 	br	ret_from_sys_call
 .end entMM
 
-.align 3
-.globl	entArith
-.ent	entArith
-entArith:
-	SAVE_ALL
-	lda	$8,0x3fff
-	lda	$26,ret_from_sys_call
-	bic	$30,$8,$8
-	jsr	$31,do_entArith
-.end entArith
-
-.align 3
-.globl	entIF
-.ent	entIF
+	.align	4
+	.globl	entIF
+	.ent	entIF
 entIF:
 	SAVE_ALL
-	lda	$8,0x3fff
-	lda	$26,ret_from_sys_call
-	bic	$30,$8,$8
-	jsr	$31,do_entIF
+	lda	$8, 0x3fff
+	lda	$26, ret_from_sys_call
+	bic	$sp, $8, $8
+	mov	$sp, $17
+	jsr	$31, do_entIF
 .end entIF
 
-.align 3
-.globl	entDbg
-.ent	entDbg
+	.align	4
+	.globl	entUna
+	.ent	entUna
+entUna:
+	lda	$sp, -256($sp)
+	stq	$0, 0($sp)
+	ldq	$0, 256($sp)	/* get PS */
+	stq	$1, 8($sp)
+	stq	$2, 16($sp)
+	stq	$3, 24($sp)
+	and	$0, 8, $0		/* user mode? */
+	stq	$4, 32($sp)
+	bne	$0, entUnaUser	/* yup -> do user-level unaligned fault */
+	stq	$5, 40($sp)
+	stq	$6, 48($sp)
+	stq	$7, 56($sp)
+	stq	$8, 64($sp)
+	stq	$9, 72($sp)
+	stq	$10, 80($sp)
+	stq	$11, 88($sp)
+	stq	$12, 96($sp)
+	stq	$13, 104($sp)
+	stq	$14, 112($sp)
+	stq	$15, 120($sp)
+	/* 16-18 PAL-saved */
+	stq	$19, 152($sp)
+	stq	$20, 160($sp)
+	stq	$21, 168($sp)
+	stq	$22, 176($sp)
+	stq	$23, 184($sp)
+	stq	$24, 192($sp)
+	stq	$25, 200($sp)
+	stq	$26, 208($sp)
+	stq	$27, 216($sp)
+	stq	$28, 224($sp)
+	stq	$gp, 232($sp)
+	lda	$8, 0x3fff
+	stq	$31, 248($sp)
+	bic	$sp, $8, $8
+	jsr	$26, do_entUna
+	ldq	$0, 0($sp)
+	ldq	$1, 8($sp)
+	ldq	$2, 16($sp)
+	ldq	$3, 24($sp)
+	ldq	$4, 32($sp)
+	ldq	$5, 40($sp)
+	ldq	$6, 48($sp)
+	ldq	$7, 56($sp)
+	ldq	$8, 64($sp)
+	ldq	$9, 72($sp)
+	ldq	$10, 80($sp)
+	ldq	$11, 88($sp)
+	ldq	$12, 96($sp)
+	ldq	$13, 104($sp)
+	ldq	$14, 112($sp)
+	ldq	$15, 120($sp)
+	/* 16-18 PAL-saved */
+	ldq	$19, 152($sp)
+	ldq	$20, 160($sp)
+	ldq	$21, 168($sp)
+	ldq	$22, 176($sp)
+	ldq	$23, 184($sp)
+	ldq	$24, 192($sp)
+	ldq	$25, 200($sp)
+	ldq	$26, 208($sp)
+	ldq	$27, 216($sp)
+	ldq	$28, 224($sp)
+	ldq	$gp, 232($sp)
+	lda	$sp, 256($sp)
+	call_pal PAL_rti
+.end entUna
+
+	.align	4
+	.ent	entUnaUser
+entUnaUser:
+	ldq	$0, 0($sp)	/* restore original $0 */
+	lda	$sp, 256($sp)	/* pop entUna's stack frame */
+	SAVE_ALL		/* setup normal kernel stack */
+	lda	$sp, -56($sp)
+	stq	$9, 0($sp)
+	stq	$10, 8($sp)
+	stq	$11, 16($sp)
+	stq	$12, 24($sp)
+	stq	$13, 32($sp)
+	stq	$14, 40($sp)
+	stq	$15, 48($sp)
+	lda	$8, 0x3fff
+	addq	$sp, 56, $19
+	bic	$sp, $8, $8
+	jsr	$26, do_entUnaUser
+	ldq	$9, 0($sp)
+	ldq	$10, 8($sp)
+	ldq	$11, 16($sp)
+	ldq	$12, 24($sp)
+	ldq	$13, 32($sp)
+	ldq	$14, 40($sp)
+	ldq	$15, 48($sp)
+	lda	$sp, 56($sp)
+	br	ret_from_sys_call
+.end entUnaUser
+
+	.align	4
+	.globl	entDbg
+	.ent	entDbg
 entDbg:
 	SAVE_ALL
-	lda	$8,0x3fff
-	lda	$26,ret_from_sys_call
-	bic	$30,$8,$8
-	jsr	$31,do_entDbg
+	lda	$8, 0x3fff
+	lda	$26, ret_from_sys_call
+	bic	$sp, $8, $8
+	mov	$sp, $16
+	jsr	$31, do_entDbg
 .end entDbg
+
+/*
+ * The system call entry point is special.  Most importantly, it looks
+ * like a function call to userspace as far as clobbered registers.  We
+ * do preserve the argument registers (for syscall restarts) and $26
+ * (for leaf syscall functions).
+ *
+ * So much for theory.  We don't take advantage of this yet.
+ *
+ * Note that a0-a2 are not saved by PALcode as with the other entry points.
+ */
+
+	.align	4
+	.globl	entSys
+	.globl	ret_from_sys_call
+	.ent	entSys
+entSys:
+	SAVE_ALL
+	lda	$8, 0x3fff
+	bic	$sp, $8, $8
+	lda	$4, NR_SYSCALLS($31)
+	stq	$16, SP_OFF+24($sp)
+	lda	$5, sys_call_table
+	lda	$27, sys_ni_syscall
+	cmpult	$0, $4, $4
+	ldl	$3, TI_FLAGS($8)
+	stq	$17, SP_OFF+32($sp)
+	s8addq	$0, $5, $5
+	stq	$18, SP_OFF+40($sp)
+	blbs	$3, strace
+	beq	$4, 1f
+	ldq	$27, 0($5)
+1:	jsr	$26, ($27), alpha_ni_syscall
+	ldgp	$gp, 0($26)
+	blt	$0, $syscall_error	/* the call failed */
+	stq	$0, 0($sp)
+	stq	$31, 72($sp)		/* a3=0 => no error */
+
+	.align	4
+ret_from_sys_call:
+	cmovne	$26, 0, $19		/* $19 = 0 => non-restartable */
+	ldq	$0, SP_OFF($sp)
+	and	$0, 8, $0
+	beq	$0, restore_all
+ret_from_reschedule:
+	/* Make sure need_resched and sigpending don't change between
+		sampling and the rti.  */
+	lda	$16, 7
+	call_pal PAL_swpipl
+	ldl	$5, TI_FLAGS($8)
+	and	$5, _TIF_WORK_MASK, $2
+	bne	$5, work_pending
+restore_all:
+	RESTORE_ALL
+	call_pal PAL_rti
 
+	.align 3
+$syscall_error:
+	/*
+	 * Some system calls (e.g., ptrace) can return arbitrary
+	 * values which might normally be mistaken as error numbers.
+	 * Those functions must zero $0 (v0) directly in the stack
+	 * frame to indicate that a negative return value wasn't an
+	 * error number..
+	 */
+	ldq	$19, 0($sp)	/* old syscall nr (zero if success) */
+	beq	$19, $ret_success
+
+	ldq	$20, 72($sp)	/* .. and this a3 */
+	subq	$31, $0, $0	/* with error in v0 */
+	addq	$31, 1, $1	/* set a3 for errno return */
+	stq	$0, 0($sp)
+	mov	$31, $26	/* tell "ret_from_sys_call" we can restart */
+	stq	$1, 72($sp)	/* a3 for return */
+	br	ret_from_sys_call
+
+$ret_success:
+	stq	$0, 0($sp)
+	stq	$31, 72($sp)	/* a3=0 => no error */
+	br	ret_from_sys_call
+.end entSys
+
+/*
+ * Do all cleanup when returning from all interrupts and system calls.
+ *
+ * Arguments:
+ *       $5: TI_FLAGS.
+ *       $8: current.
+ *      $19: The old syscall number, or zero if this is not a return
+ *           from a syscall that errored and is possibly restartable.
+ *      $20: Error indication.
+ */
+
+	.align	4
+	.ent	work_pending
+work_pending:
+	and	$5, _TIF_NEED_RESCHED, $2
+	beq	$2, $work_notifysig
+
+$work_resched:
+	subq	$sp, 16, $sp
+	stq	$19, 0($sp)              /* save syscall nr */
+	stq	$20, 8($sp)              /* and error indication (a3) */
+	jsr	$26, schedule
+	ldq	$19, 0($sp)
+	ldq	$20, 8($sp)
+	addq	$sp, 16, $sp
+	/* Make sure need_resched and sigpending don't change between
+		sampling and the rti.  */
+	lda	$16, 7
+	call_pal PAL_swpipl
+	ldl	$5, TI_FLAGS($8)
+	and	$5, _TIF_WORK_MASK, $2
+	beq	$2, restore_all
+	and	$5, _TIF_NEED_RESCHED, $2
+	bne	$2, $work_resched
+
+$work_notifysig:
+	mov	$sp, $17
+	br	$1, do_switch_stack
+	mov	$5, $21
+	mov	$sp, $18
+	mov	$31, $16
+	jsr	$26, do_notify_resume
+	bsr	$1, undo_switch_stack
+	br	restore_all
+.end work_pending
+
+/*
+ * PTRACE syscall handler
+ */
+
+	.align	4
+	.ent	strace
+strace:
+	/* set up signal stack, call syscall_trace */
+	bsr	$1, do_switch_stack
+	jsr	$26, syscall_trace
+	bsr	$1, undo_switch_stack
+
+	/* get the system call number and the arguments back.. */
+	ldq	$0, 0($sp)
+	ldq	$16, SP_OFF+24($sp)
+	ldq	$17, SP_OFF+32($sp)
+	ldq	$18, SP_OFF+40($sp)
+	ldq	$19, 72($sp)
+	ldq	$20, 80($sp)
+	ldq	$21, 88($sp)
+
+	/* get the system call pointer.. */
+	lda	$1, NR_SYSCALLS($31)
+	lda	$2, sys_call_table
+	lda	$27, alpha_ni_syscall
+	cmpult	$0, $1, $1
+	s8addq	$0, $2, $2
+	beq	$1, 1f
+	ldq	$27, 0($2)
+1:	jsr	$26, ($27), sys_gettimeofday
+	ldgp	$gp, 0($26)
+
+	/* check return.. */
+	blt	$0, $strace_error	/* the call failed */
+	stq	$31, 72($sp)		/* a3=0 => no error */
+$strace_success:
+	stq	$0, 0($sp)		/* save return value */
+
+	bsr	$1, do_switch_stack
+	jsr	$26, syscall_trace
+	bsr	$1, undo_switch_stack
+	br	$31, ret_from_sys_call
+
+	.align	3
+$strace_error:
+	ldq	$19, 0($sp)	/* old syscall nr (zero if success) */
+	beq	$19, $strace_success
+	ldq	$20, 72($sp)	/* .. and this a3 */
+
+	subq	$31, $0, $0	/* with error in v0 */
+	addq	$31, 1, $1	/* set a3 for errno return */
+	stq	$0, 0($sp)
+	stq	$1, 72($sp)	/* a3 for return */
+
+	bsr	$1, do_switch_stack
+	mov	$19, $9		/* save old syscall number */
+	mov	$20, $10	/* save old a3 */
+	jsr	$26, syscall_trace
+	mov	$9, $19
+	mov	$10, $20
+	bsr	$1, undo_switch_stack
+
+	mov	$31, $26	/* tell "ret_from_sys_call" we can restart */
+	br	ret_from_sys_call
+.end strace
+
+/*
+ * Save and restore the switch stack -- aka the balance of the user context.
+ */
+
+	.align	4
+	.ent	do_switch_stack
+do_switch_stack:
+	lda	$sp, -SWITCH_STACK_SIZE($sp)
+	stq	$9, 0($sp)
+	stq	$10, 8($sp)
+	stq	$11, 16($sp)
+	stq	$12, 24($sp)
+	stq	$13, 32($sp)
+	stq	$14, 40($sp)
+	stq	$15, 48($sp)
+	stq	$26, 56($sp)
+	stt	$f0, 64($sp)
+	stt	$f1, 72($sp)
+	stt	$f2, 80($sp)
+	stt	$f3, 88($sp)
+	stt	$f4, 96($sp)
+	stt	$f5, 104($sp)
+	stt	$f6, 112($sp)
+	stt	$f7, 120($sp)
+	stt	$f8, 128($sp)
+	stt	$f9, 136($sp)
+	stt	$f10, 144($sp)
+	stt	$f11, 152($sp)
+	stt	$f12, 160($sp)
+	stt	$f13, 168($sp)
+	stt	$f14, 176($sp)
+	stt	$f15, 184($sp)
+	stt	$f16, 192($sp)
+	stt	$f17, 200($sp)
+	stt	$f18, 208($sp)
+	stt	$f19, 216($sp)
+	stt	$f20, 224($sp)
+	stt	$f21, 232($sp)
+	stt	$f22, 240($sp)
+	stt	$f23, 248($sp)
+	stt	$f24, 256($sp)
+	stt	$f25, 264($sp)
+	stt	$f26, 272($sp)
+	stt	$f27, 280($sp)
+	mf_fpcr	$f0		# get fpcr
+	stt	$f28, 288($sp)
+	stt	$f29, 296($sp)
+	stt	$f30, 304($sp)
+	stt	$f0, 312($sp)	# save fpcr in slot of $f31
+	ldt	$f0, 64($sp)	# dont let "do_switch_stack" change fp state.
+	ret	$31, ($1), 1
+.end do_switch_stack
+
+	.align	4
+	.ent	undo_switch_stack
+undo_switch_stack:
+	ldq	$9, 0($sp)
+	ldq	$10, 8($sp)
+	ldq	$11, 16($sp)
+	ldq	$12, 24($sp)
+	ldq	$13, 32($sp)
+	ldq	$14, 40($sp)
+	ldq	$15, 48($sp)
+	ldq	$26, 56($sp)
+	ldt	$f30, 312($sp)	# get saved fpcr
+	ldt	$f0, 64($sp)
+	ldt	$f1, 72($sp)
+	ldt	$f2, 80($sp)
+	ldt	$f3, 88($sp)
+	mt_fpcr	$f30		# install saved fpcr
+	ldt	$f4, 96($sp)
+	ldt	$f5, 104($sp)
+	ldt	$f6, 112($sp)
+	ldt	$f7, 120($sp)
+	ldt	$f8, 128($sp)
+	ldt	$f9, 136($sp)
+	ldt	$f10, 144($sp)
+	ldt	$f11, 152($sp)
+	ldt	$f12, 160($sp)
+	ldt	$f13, 168($sp)
+	ldt	$f14, 176($sp)
+	ldt	$f15, 184($sp)
+	ldt	$f16, 192($sp)
+	ldt	$f17, 200($sp)
+	ldt	$f18, 208($sp)
+	ldt	$f19, 216($sp)
+	ldt	$f20, 224($sp)
+	ldt	$f21, 232($sp)
+	ldt	$f22, 240($sp)
+	ldt	$f23, 248($sp)
+	ldt	$f24, 256($sp)
+	ldt	$f25, 264($sp)
+	ldt	$f26, 272($sp)
+	ldt	$f27, 280($sp)
+	ldt	$f28, 288($sp)
+	ldt	$f29, 296($sp)
+	ldt	$f30, 304($sp)
+	lda	$sp, SWITCH_STACK_SIZE($sp)
+	ret	$31, ($1), 1
+.end undo_switch_stack
+
+/*
+ * The meat of the context switch code.
+ */
+
+	.align	4
+	.globl	alpha_switch_to
+	.ent	alpha_switch_to
+alpha_switch_to:
+	.prologue 0
+	bsr	$1, do_switch_stack
+	call_pal PAL_swpctx
+	lda	$8, 0x3fff
+	bsr	$1, undo_switch_stack
+	bic	$sp, $8, $8
+	ret	$31, ($26), 1
+.end alpha_switch_to
+
+/*
+ * New processes begin life here.
+ */
+
+	.globl	ret_from_fork
+#if CONFIG_SMP || CONFIG_PREEMPT
+	.align	4
+	.ent	ret_from_fork
+ret_from_fork:
+	lda	$26, ret_from_sys_call
+	mov	$17, $16
+	jmp	$31, schedule_tail
+.end ret_from_fork
+#else
+ret_from_fork = ret_from_sys_call
+#endif
 
 /*
  * kernel_thread(fn, arg, clone_flags)
@@ -175,9 +609,9 @@ entDbg:
 	.globl	kernel_thread
 	.ent	kernel_thread
 kernel_thread:
-	ldgp	$29,0($27)	/* we can be called from a module */
+	ldgp	$gp, 0($27)	/* we can be called from a module */
 	.prologue 1
-	subq	$30,SP_OFF+6*8,$30
+	subq	$sp, SP_OFF+6*8, $sp
 	br	$1, 2f		/* load start address */
 
 	/* We've now "returned" from a fake system call.  */
@@ -186,9 +620,9 @@ kernel_thread:
 	ldi	$1, 0x3fff
 	beq	$20, 1f		/* parent or child?  */
 
-	bic	$30, $1, $8	/* in child.  */
+	bic	$sp, $1, $8	/* in child.  */
 	jsr	$26, ($27)
-	ldgp	$29, 0($26)
+	ldgp	$gp, 0($26)
 	mov	$0, $16
 	mov	$31, $26
 	jmp	$31, sys_exit
@@ -200,16 +634,16 @@ kernel_thread:
 	   from kernel space.  Note that we store FN and ARG as they
 	   need to be set up in the child for the call.  Also store $8
 	   and $26 for use in the parent.  */
-	stq	$31, SP_OFF($30)	/* ps */
-	stq	$1, SP_OFF+8($30)	/* pc */
-	stq	$29, SP_OFF+16($30)	/* gp */
-	stq	$16, 136($30)		/* $27; FN for child */
-	stq	$17, SP_OFF+24($30)	/* $16; ARG for child */
-	stq	$8, 64($30)		/* $8 */
-	stq	$26, 128($30)		/* $26 */
+	stq	$31, SP_OFF($sp)	/* ps */
+	stq	$1, SP_OFF+8($sp)	/* pc */
+	stq	$gp, SP_OFF+16($sp)	/* gp */
+	stq	$16, 136($sp)		/* $27; FN for child */
+	stq	$17, SP_OFF+24($sp)	/* $16; ARG for child */
+	stq	$8, 64($sp)		/* $8 */
+	stq	$26, 128($sp)		/* $26 */
 	/* Avoid the HAE being gratuitously wrong, to avoid restoring it.  */
 	ldq	$2, alpha_mv+HAE_CACHE
-	stq	$2, 152($30)		/* HAE */
+	stq	$2, 152($sp)		/* HAE */
 
 	/* Shuffle FLAGS to the front; add CLONE_VM.  */
 	ldi	$1, CLONE_VM|CLONE_UNTRACED
@@ -218,515 +652,126 @@ kernel_thread:
 
 	/* We don't actually care for a3 success widgetry in the kernel.
 	   Not for positive errno values.  */
-	stq	$0, 0($30)		/* $0 */
+	stq	$0, 0($sp)		/* $0 */
 	br	restore_all
 .end kernel_thread
 
 /*
  * __kernel_execve(path, argv, envp, regs)
  */
-.align 3
-.globl	__kernel_execve
-.ent	__kernel_execve
+	.align	4
+	.globl	__kernel_execve
+	.ent	__kernel_execve
 __kernel_execve:
-	ldgp	$29,0($27)	/* we can be called from modules.  */
-	subq	$30,16,$30
-	.frame	$30,16,$26,0
-	stq	$26,0($30)
-	stq	$19,8($30)
+	ldgp	$gp, 0($27)	/* we can be called from modules.  */
+	subq	$sp, 16, $sp
+	.frame	$sp, 16, $26, 0
+	stq	$26, 0($sp)
+	stq	$19, 8($sp)
 	.prologue 1
-	jsr	$26,do_execve
-	bne	$0,1f		/* error! */
-	ldq	$30,8($30)
-	br	$31,ret_from_sys_call
-1:	ldq	$26,0($30)
-	addq	$30,16,$30
+	jsr	$26, do_execve
+	bne	$0, 1f		/* error! */
+	ldq	$sp, 8($sp)
+	br	$31, ret_from_sys_call
+1:	ldq	$26, 0($sp)
+	addq	$sp, 16, $sp
 	ret
 .end __kernel_execve
 
-.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)
-	mf_fpcr	$f0		# get fpcr
-	stt	$f28,288($30)
-	stt	$f29,296($30)
-	stt	$f30,304($30)
-	stt	$f0,312($30)	# save fpcr in slot of $f31
-	ldt	$f0,64($30)	# dont let "do_switch_stack" change fp state.
-	ret	$31,($1),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	$f30,312($30)	# get saved fpcr
-	ldt	$f0,64($30)
-	ldt	$f1,72($30)
-	ldt	$f2,80($30)
-	ldt	$f3,88($30)
-	mt_fpcr	$f30		# install saved fpcr
-	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,($1),1
-.end undo_switch_stack
-
-.align 3
-.globl	entUna
-.ent	entUna
-entUna:
-	lda	$30,-256($30)
-	stq	$0,0($30)
-	ldq	$0,256($30)	/* get PS */
-	stq	$1,8($30)
-	stq	$2,16($30)
-	stq	$3,24($30)
-	and	$0,8,$0		/* user mode? */
-	stq	$4,32($30)
-	bne	$0,entUnaUser	/* yup -> do user-level unaligned fault */
-	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)
-	lda	$8,0x3fff
-	stq	$31,248($30)
-	bic	$30,$8,$8
-	jsr	$26,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)
-	lda	$30,256($30)
-	call_pal PAL_rti
-.end entUna
-
-.align 3
-.ent	entUnaUser
-entUnaUser:
-	ldq	$0,0($30)	/* restore original $0 */
-	lda	$30,256($30)	/* pop entUna's stack frame */
-	SAVE_ALL		/* setup normal kernel stack */
-	lda	$30,-56($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)
-	lda	$8,0x3fff
-	addq	$30,56,$19
-	bic	$30,$8,$8
-	jsr	$26,do_entUnaUser
-	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)
-	lda	$30,56($30)
-	br	ret_from_sys_call
-.end	entUnaUser
-
+
 /*
- * A fork is the same as clone(SIGCHLD, 0);
+ * Special system calls.  Most of these are special in that they either
+ * have to play switch_stack games or in some way use the pt_regs struct.
  */
-.align 3
-.globl	sys_fork
-.ent	sys_fork
+	.align	4
+	.globl	sys_fork
+	.ent	sys_fork
 sys_fork:
-	bsr	$1,do_switch_stack
-	bis	$31,SIGCHLD,$16
-	mov	$31,$17
-	mov	$31,$18
-	mov	$30,$19
-	jsr	$26,alpha_clone
-	bsr	$1,undo_switch_stack
-	ret	$31,($26),1
+	mov	$sp, $19
+	bsr	$1, do_switch_stack
+	/* A fork is the same as clone(SIGCHLD, 0);  */
+	bis	$31, SIGCHLD, $16
+	mov	$31, $17
+	mov	$31, $18
+	jsr	$26, alpha_clone
+	bsr	$1, undo_switch_stack
+	ret	$31, ($26), 1
 .end sys_fork
 
-.align 3
-.globl	sys_clone
-.ent	sys_clone
+	.align	4
+	.globl	sys_clone
+	.ent	sys_clone
 sys_clone:
-	bsr	$1,do_switch_stack
+	mov	$sp, $19
+	bsr	$1, do_switch_stack
 	/* $16, $17, $18, $19 come from the user; $19 is used later
 	   via pt_regs->r19.  */
-	mov	$30,$19
-	jsr	$26,alpha_clone
-	bsr	$1,undo_switch_stack
-	ret	$31,($26),1
+	jsr	$26, alpha_clone
+	bsr	$1, undo_switch_stack
+	ret	$31, ($26), 1
 .end sys_clone
 
-.align 3
-.globl	sys_vfork
-.ent	sys_vfork
+	.align	4
+	.globl	sys_vfork
+	.ent	sys_vfork
 sys_vfork:
-	bsr	$1,do_switch_stack
-	mov	$30,$16
-	jsr	$26,alpha_vfork
-	bsr	$1,undo_switch_stack
-	ret	$31,($26),1
+	bsr	$1, do_switch_stack
+	mov	$sp, $16
+	jsr	$26, alpha_vfork
+	bsr	$1, undo_switch_stack
+	ret	$31, ($26), 1
 .end sys_vfork
 
-.align 3
-.globl  alpha_switch_to
-.ent    alpha_switch_to
-alpha_switch_to:
-	.prologue 0
-	bsr	$1,do_switch_stack
-	call_pal PAL_swpctx
-	lda	$8,0x3fff
-	bsr	$1,undo_switch_stack
-	bic	$30,$8,$8
-	ret	$31,($26),1
-.end alpha_switch_to
-
-#if CONFIG_SMP || CONFIG_PREEMPT
-.globl  ret_from_fork
-.align 3
-.ent ret_from_fork
-ret_from_fork:
-	lda	$26,ret_from_sys_call
-	mov	$17,$16
-	jmp	$31,schedule_tail
-.end ret_from_fork
-#endif
-
-/*
- * 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:
-	SAVE_ALL
-	lda	$8,0x3fff
-	bic	$30,$8,$8
-	lda	$4,NR_SYSCALLS($31)
-	stq	$16,SP_OFF+24($30)
-	lda	$5,sys_call_table
-	lda	$27,sys_ni_syscall
-	cmpult	$0,$4,$4
-	ldl	$3,TI_FLAGS($8)
-	stq	$17,SP_OFF+32($30)
-	s8addq	$0,$5,$5
-	stq	$18,SP_OFF+40($30)
-	blbs	$3,strace
-	beq	$4,1f
-	ldq	$27,0($5)
-1:	jsr	$26,($27),alpha_ni_syscall
-	ldgp	$29,0($26)
-	blt	$0,syscall_error	/* the call failed */
-	stq	$0,0($30)
-	stq	$31,72($30)		/* a3=0 => no error */
-
-.align 3
-ret_from_sys_call:
-	cmovne	$26,0,$19		/* $19 = 0 => non-restartable */
-	ldq	$0,SP_OFF($30)
-	and	$0,8,$0
-	beq	$0,restore_all
-ret_from_reschedule:
-	/* Make sure need_resched and sigpending don't change between
-		sampling and the rti.  */
-	lda	$16,7
-	call_pal PAL_swpipl
-	ldl	$5,TI_FLAGS($8)
-	and	$5,_TIF_WORK_MASK,$2
-	bne	$5,work_pending
-restore_all:
-	RESTORE_ALL
-	call_pal PAL_rti
-
-work_pending:
-	and	$5,_TIF_NEED_RESCHED,$2
-	beq	$2,work_notifysig
-
-work_resched:
-	subq	$30,16,$30
-	stq	$19,0($30)              /* save syscall nr */
-	stq	$20,8($30)              /* and error indication (a3) */
-	jsr	$26,schedule
-	ldq	$19,0($30)
-	ldq	$20,8($30)
-	addq	$30,16,$30
-	/* Make sure need_resched and sigpending don't change between
-		sampling and the rti.  */
-	lda	$16,7
-	call_pal PAL_swpipl
-	ldl	$5,TI_FLAGS($8)
-	and	$5,_TIF_WORK_MASK,$2
-	beq	$2,restore_all
-	and	$5,_TIF_NEED_RESCHED,$2
-	bne	$2,work_resched
-
-work_notifysig:
-	mov	$30,$17
-	br	$1,do_switch_stack
-	mov	$5,$21
-	mov	$30,$18
-	mov	$31,$16
-	jsr	$26,do_notify_resume
-	bsr	$1,undo_switch_stack
-	br	restore_all
-
-/* PTRACE syscall handler */
-.align 3
-strace:
-	/* set up signal stack, call syscall_trace */
-	bsr	$1,do_switch_stack
-	jsr	$26,syscall_trace
-	bsr	$1,undo_switch_stack
-
-	/* get the system call number and the arguments back.. */
-	ldq	$0,0($30)
-	ldq	$16,SP_OFF+24($30)
-	ldq	$17,SP_OFF+32($30)
-	ldq	$18,SP_OFF+40($30)
-	ldq	$19,72($30)
-	ldq	$20,80($30)
-	ldq	$21,88($30)
-
-	/* get the system call pointer.. */
-	lda	$1,NR_SYSCALLS($31)
-	lda	$2,sys_call_table
-	lda	$27,alpha_ni_syscall
-	cmpult	$0,$1,$1
-	s8addq	$0,$2,$2
-	beq	$1,1f
-	ldq	$27,0($2)
-1:	jsr	$26,($27),sys_gettimeofday
-	ldgp	$29,0($26)
-
-	/* check return.. */
-	blt	$0,strace_error	/* the call failed */
-	stq	$31,72($30)		/* a3=0 => no error */
-strace_success:
-	stq	$0,0($30)		/* save return value */
-
-	bsr	$1,do_switch_stack
-	jsr	$26,syscall_trace
-	bsr	$1,undo_switch_stack
-	br	$31,ret_from_sys_call
-
-	.align	3
-strace_error:
-	ldq	$19,0($30)	/* old syscall nr (zero if success) */
-	beq	$19,strace_success
-	ldq	$20,72($30)	/* .. and this a3 */
-
-	subq	$31,$0,$0	/* with error in v0 */
-	addq	$31,1,$1	/* set a3 for errno return */
-	stq	$0,0($30)
-	stq	$1,72($30)	/* a3 for return */
-
-	bsr	$1,do_switch_stack
-	mov	$19,$9		/* save old syscall number */
-	mov	$20,$10		/* save old a3 */
-	jsr	$26,syscall_trace
-	mov	$9,$19
-	mov	$10,$20
-	bsr	$1,undo_switch_stack
-
-	mov	$31,$26		/* tell "ret_from_sys_call" we can restart */
-	br	ret_from_sys_call
-
-	.align 3
-syscall_error:
-	/*
-	 * Some system calls (e.g., ptrace) can return arbitrary
-	 * values which might normally be mistaken as error numbers.
-	 * Those functions must zero $0 (v0) directly in the stack
-	 * frame to indicate that a negative return value wasn't an
-	 * error number..
-	 */
-	ldq	$19,0($30)	/* old syscall nr (zero if success) */
-	beq	$19,ret_success
-
-	ldq	$20,72($30)	/* .. and this a3 */
-	subq	$31,$0,$0	/* with error in v0 */
-	addq	$31,1,$1	/* set a3 for errno return */
-	stq	$0,0($30)
-	mov	$31,$26		/* tell "ret_from_sys_call" we can restart */
-	stq	$1,72($30)	/* a3 for return */
-	br	ret_from_sys_call
-
-ret_success:
-	stq	$0,0($30)
-	stq	$31,72($30)	/* a3=0 => no error */
-	br	ret_from_sys_call
-.end entSys
-
-.align 3
-.globl sys_sigreturn
-.ent sys_sigreturn
+	.align	4
+	.globl	sys_sigreturn
+	.ent	sys_sigreturn
 sys_sigreturn:
-	mov	$30,$17
-	lda	$18,-SWITCH_STACK_SIZE($30)
-	lda	$30,-SWITCH_STACK_SIZE($30)
-	jsr	$26,do_sigreturn
-	br	$1,undo_switch_stack
+	mov	$sp, $17
+	lda	$18, -SWITCH_STACK_SIZE($sp)
+	lda	$sp, -SWITCH_STACK_SIZE($sp)
+	jsr	$26, do_sigreturn
+	br	$1, undo_switch_stack
 	br	ret_from_sys_call
 .end sys_sigreturn
 
-.align 3
-.globl sys_rt_sigreturn
-.ent sys_rt_sigreturn
+	.align	4
+	.globl	sys_rt_sigreturn
+	.ent	sys_rt_sigreturn
 sys_rt_sigreturn:
-	mov	$30,$17
-	lda	$18,-SWITCH_STACK_SIZE($30)
-	lda	$30,-SWITCH_STACK_SIZE($30)
-	jsr	$26,do_rt_sigreturn
-	br	$1,undo_switch_stack
+	mov	$sp, $17
+	lda	$18, -SWITCH_STACK_SIZE($sp)
+	lda	$sp, -SWITCH_STACK_SIZE($sp)
+	jsr	$26, do_rt_sigreturn
+	br	$1, undo_switch_stack
 	br	ret_from_sys_call
 .end sys_rt_sigreturn
 
-.align 3
-.globl sys_sigsuspend
-.ent sys_sigsuspend
+	.align	4
+	.globl	sys_sigsuspend
+	.ent	sys_sigsuspend
 sys_sigsuspend:
-	mov	$30,$17
-	br	$1,do_switch_stack
-	mov	$30,$18
-	subq	$30,16,$30
-	stq	$26,0($30)
-	jsr	$26,do_sigsuspend
-	ldq	$26,0($30)
-	lda	$30,SWITCH_STACK_SIZE+16($30)
-	ret	$31,($26),1
+	mov	$sp, $17
+	br	$1, do_switch_stack
+	mov	$sp, $18
+	subq	$sp, 16, $sp
+	stq	$26, 0($sp)
+	jsr	$26, do_sigsuspend
+	ldq	$26, 0($sp)
+	lda	$sp, SWITCH_STACK_SIZE+16($sp)
+	ret	$31, ($26), 1
 .end sys_sigsuspend
 
-.align 3
-.globl sys_rt_sigsuspend
-.ent sys_rt_sigsuspend
+	.align	4
+	.globl	sys_rt_sigsuspend
+	.ent	sys_rt_sigsuspend
 sys_rt_sigsuspend:
-	mov	$30,$18
-	br	$1,do_switch_stack
-	mov	$30,$19
-	subq	$30,16,$30
-	stq	$26,0($30)
-	jsr	$26,do_rt_sigsuspend
-	ldq	$26,0($30)
-	lda	$30,SWITCH_STACK_SIZE+16($30)
-	ret	$31,($26),1
+	mov	$sp, $18
+	br	$1, do_switch_stack
+	mov	$sp, $19
+	subq	$sp, 16, $sp
+	stq	$26, 0($sp)
+	jsr	$26, do_rt_sigsuspend
+	ldq	$26, 0($sp)
+	lda	$sp, SWITCH_STACK_SIZE+16($sp)
+	ret	$31, ($26), 1
 .end sys_rt_sigsuspend

arch/alpha/kernel/irq_alpha.c

@@ -37,14 +37,13 @@ void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  */
 
 asmlinkage void 
-do_entInt(unsigned long type, unsigned long vector, unsigned long la_ptr,
-	  unsigned long a3, unsigned long a4, unsigned long a5,
-	  struct pt_regs regs)
+do_entInt(unsigned long type, unsigned long vector,
+	  unsigned long la_ptr, struct pt_regs *regs)
 {
 	switch (type) {
 	case 0:
 #ifdef CONFIG_SMP
-		handle_ipi(&regs);
+		handle_ipi(regs);
 		return;
 #else
 		irq_err_count++;
@@ -56,32 +55,32 @@ do_entInt(unsigned long type, unsigned long vector, unsigned long la_ptr,
 #ifdef CONFIG_SMP
 	  {
 		long cpu;
-		smp_percpu_timer_interrupt(&regs);
+		smp_percpu_timer_interrupt(regs);
 		cpu = smp_processor_id();
 		if (cpu != boot_cpuid) {
 		        kstat_cpu(cpu).irqs[RTC_IRQ]++;
 		} else {
-			handle_irq(RTC_IRQ, &regs);
+			handle_irq(RTC_IRQ, regs);
 		}
 	  }
 #else
-		handle_irq(RTC_IRQ, &regs);
+		handle_irq(RTC_IRQ, regs);
 #endif
 		return;
 	case 2:
-		alpha_mv.machine_check(vector, la_ptr, &regs);
+		alpha_mv.machine_check(vector, la_ptr, regs);
 		return;
 	case 3:
-		alpha_mv.device_interrupt(vector, &regs);
+		alpha_mv.device_interrupt(vector, regs);
 		return;
 	case 4:
-		perf_irq(vector, &regs);
+		perf_irq(vector, regs);
 		return;
 	default:
 		printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
 		       type, vector);
 	}
-	printk("PC = %016lx PS=%04lx\n", regs.pc, regs.ps);
+	printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
 }
 
 void __init
@@ -96,10 +95,8 @@ common_init_isa_dma(void)
 void __init
 init_IRQ(void)
 {
-	/* Uh, this really MUST come first, just in case
-	 * the platform init_irq() causes interrupts/mchecks
-	 * (as is the case with RAWHIDE, at least).
-	 */
+	/* Just in case the platform init_irq() causes interrupts/mchecks
+	   (as is the case with RAWHIDE, at least).  */
 	wrent(entInt, 0);
 
 	alpha_mv.init_irq();

arch/alpha/kernel/process.c

@@ -227,6 +227,9 @@ flush_thread(void)
 	   with respect to the FPU.  This is all exceptions disabled.  */
 	current_thread_info()->ieee_state = 0;
 	wrfpcr(FPCR_DYN_NORMAL | ieee_swcr_to_fpcr(0));
+
+	/* Clean slate for TLS.  */
+	current_thread_info()->pcb.unique = 0;
 }
 
 void
@@ -244,16 +247,15 @@ release_thread(struct task_struct *dead_task)
  * with parameters (SIGCHLD, 0).
  */
 int
-alpha_clone(unsigned long clone_flags, unsigned long usp,
-	    int *user_tid, struct switch_stack * swstack)
+alpha_clone(unsigned long clone_flags, unsigned long usp, int *user_tid,
+	    struct pt_regs *regs)
 {
 	struct task_struct *p;
-	struct pt_regs *u_regs = (struct pt_regs *) (swstack+1);
 
 	if (!usp)
 		usp = rdusp();
 
-	p = do_fork(clone_flags & ~CLONE_IDLETASK, usp, u_regs, 0, user_tid);
+	p = do_fork(clone_flags & ~CLONE_IDLETASK, usp, regs, 0, user_tid);
 	return IS_ERR(p) ? PTR_ERR(p) : p->pid;
 }
 
@@ -282,7 +284,6 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	    unsigned long unused,
 	    struct task_struct * p, struct pt_regs * regs)
 {
-	extern void ret_from_sys_call(void);
 	extern void ret_from_fork(void);
 
 	struct thread_info *childti = p->thread_info;
@@ -304,11 +305,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	stack = ((struct switch_stack *) regs) - 1;
 	childstack = ((struct switch_stack *) childregs) - 1;
 	*childstack = *stack;
-#ifdef CONFIG_SMP
 	childstack->r26 = (unsigned long) ret_from_fork;
-#else
-	childstack->r26 = (unsigned long) ret_from_sys_call;
-#endif
 	childti->pcb.usp = usp;
 	childti->pcb.ksp = (unsigned long) childstack;
 	childti->pcb.flags = 1;	/* set FEN, clear everything else */

arch/alpha/kernel/traps.c

@@ -210,8 +210,7 @@ long alpha_fp_emul (unsigned long pc);
 
 asmlinkage void
 do_entArith(unsigned long summary, unsigned long write_mask,
-	    unsigned long a2, unsigned long a3, unsigned long a4,
-	    unsigned long a5, struct pt_regs regs)
+	    struct pt_regs *regs)
 {
 	long si_code = FPE_FLTINV;
 	siginfo_t info;
@@ -221,23 +220,21 @@ do_entArith(unsigned long summary, unsigned long write_mask,
 		   emulate the instruction.  If the processor supports
 		   precise exceptions, we don't have to search.  */
 		if (!amask(AMASK_PRECISE_TRAP))
-			si_code = alpha_fp_emul(regs.pc - 4);
+			si_code = alpha_fp_emul(regs->pc - 4);
 		else
-			si_code = alpha_fp_emul_imprecise(&regs, write_mask);
+			si_code = alpha_fp_emul_imprecise(regs, write_mask);
 	}
-	die_if_kernel("Arithmetic fault", &regs, 0, 0);
+	die_if_kernel("Arithmetic fault", regs, 0, 0);
 
 	info.si_signo = SIGFPE;
 	info.si_errno = 0;
 	info.si_code = si_code;
-	info.si_addr = (void *) regs.pc;
+	info.si_addr = (void *) regs->pc;
 	send_sig_info(SIGFPE, &info, current);
 }
 
 asmlinkage void
-do_entIF(unsigned long type, unsigned long a1,
-	 unsigned long a2, unsigned long a3, unsigned long a4,
-	 unsigned long a5, struct pt_regs regs)
+do_entIF(unsigned long type, struct pt_regs *regs)
 {
 	siginfo_t info;
 	int signo, code;
@@ -245,13 +242,13 @@ do_entIF(unsigned long type, unsigned long a1,
 	if (!opDEC_testing || type != 4) {
 		if (type == 1) {
 			const unsigned int *data
-			  = (const unsigned int *) regs.pc;
+			  = (const unsigned int *) regs->pc;
 			printk("Kernel bug at %s:%d\n",
 			       (const char *)(data[1] | (long)data[2] << 32), 
 			       data[0]);
 		}
 		die_if_kernel((type == 1 ? "Kernel Bug" : "Instruction fault"),
-		      &regs, type, 0);
+			      regs, type, 0);
 	}
 
 	switch (type) {
@@ -260,10 +257,10 @@ do_entIF(unsigned long type, unsigned long a1,
 		info.si_errno = 0;
 		info.si_code = TRAP_BRKPT;
 		info.si_trapno = 0;
-		info.si_addr = (void *) regs.pc;
+		info.si_addr = (void *) regs->pc;
 
 		if (ptrace_cancel_bpt(current)) {
-			regs.pc -= 4;	/* make pc point to former bpt */
+			regs->pc -= 4;	/* make pc point to former bpt */
 		}
 
 		send_sig_info(SIGTRAP, &info, current);
@@ -273,15 +270,15 @@ do_entIF(unsigned long type, unsigned long a1,
 		info.si_signo = SIGTRAP;
 		info.si_errno = 0;
 		info.si_code = __SI_FAULT;
-		info.si_addr = (void *) regs.pc;
+		info.si_addr = (void *) regs->pc;
 		info.si_trapno = 0;
 		send_sig_info(SIGTRAP, &info, current);
 		return;
 		
 	      case 2: /* gentrap */
-		info.si_addr = (void *) regs.pc;
-		info.si_trapno = regs.r16;
-		switch ((long) regs.r16) {
+		info.si_addr = (void *) regs->pc;
+		info.si_trapno = regs->r16;
+		switch ((long) regs->r16) {
 		case GEN_INTOVF:
 			signo = SIGFPE;
 			code = FPE_INTOVF;
@@ -341,7 +338,7 @@ do_entIF(unsigned long type, unsigned long a1,
 		info.si_signo = signo;
 		info.si_errno = 0;
 		info.si_code = code;
-		info.si_addr = (void *) regs.pc;
+		info.si_addr = (void *) regs->pc;
 		send_sig_info(signo, &info, current);
 		return;
 
@@ -358,26 +355,26 @@ do_entIF(unsigned long type, unsigned long a1,
 			   we get the correct PC.  If not, we set a flag
 			   to correct it every time through.  */
 			if (opDEC_testing) {
-				if (regs.pc == opDEC_test_pc) {
+				if (regs->pc == opDEC_test_pc) {
 					opDEC_fix = 4;
-					regs.pc += 4;
+					regs->pc += 4;
 					printk("opDEC fixup enabled.\n");
 				}
 				return;
 			}
-			regs.pc += opDEC_fix; 
+			regs->pc += opDEC_fix; 
 			
 			/* EV4 does not implement anything except normal
 			   rounding.  Everything else will come here as
 			   an illegal instruction.  Emulate them.  */
-			si_code = alpha_fp_emul(regs.pc - 4);
+			si_code = alpha_fp_emul(regs->pc - 4);
 			if (si_code == 0)
 				return;
 			if (si_code > 0) {
 				info.si_signo = SIGFPE;
 				info.si_errno = 0;
 				info.si_code = si_code;
-				info.si_addr = (void *) regs.pc;
+				info.si_addr = (void *) regs->pc;
 				send_sig_info(SIGFPE, &info, current);
 				return;
 			}
@@ -406,7 +403,7 @@ do_entIF(unsigned long type, unsigned long a1,
 	info.si_signo = SIGILL;
 	info.si_errno = 0;
 	info.si_code = ILL_ILLOPC;
-	info.si_addr = regs.pc;
+	info.si_addr = (void *) regs->pc;
 	send_sig_info(SIGILL, &info, current);
 }
 
@@ -418,18 +415,16 @@ do_entIF(unsigned long type, unsigned long a1,
    and if we don't put something on the entry point we'll oops.  */
 
 asmlinkage void
-do_entDbg(unsigned long type, unsigned long a1,
-	  unsigned long a2, unsigned long a3, unsigned long a4,
-	  unsigned long a5, struct pt_regs regs)
+do_entDbg(struct pt_regs *regs)
 {
 	siginfo_t info;
 
-	die_if_kernel("Instruction fault", &regs, type, 0);
+	die_if_kernel("Instruction fault", regs, 0, 0);
 
 	info.si_signo = SIGILL;
 	info.si_errno = 0;
 	info.si_code = ILL_ILLOPC;
-	info.si_addr = regs.pc;
+	info.si_addr = (void *) regs->pc;
 	force_sig_info(SIGILL, &info, current);
 }
 
@@ -1114,9 +1109,7 @@ trap_init(void)
 	wrent(entDbg, 6);
 
 	/* Hack for Multia (UDB) and JENSEN: some of their SRMs have
-	 * a bug in the handling of the opDEC fault.  Fix it up if so.
-	 */
-	if (implver() == IMPLVER_EV4) {
+	   a bug in the handling of the opDEC fault.  Fix it up if so.  */
+	if (implver() == IMPLVER_EV4)
 		opDEC_check();
-	}
 }