alpha: Generate dwarf2 unwind info for various kernel entry points. (231b0bed) · Commits · e / devices / android_kernel_samsung_universal8895

arch/alpha/kernel/entry.S

+288 −111

Original line number	Original line	Diff line number	Diff line
	@@ -12,11 +12,32 @@

	.text		.text
	.set noat		.set noat
			.cfi_sections .debug_frame

	/* Stack offsets. */		/* Stack offsets. */
	#define SP_OFF 184		#define SP_OFF 184
	#define SWITCH_STACK_SIZE 320		#define SWITCH_STACK_SIZE 320

			.macro CFI_START_OSF_FRAME func
			.align 4
			.globl \func
			.type \func,@function
			\func:
			.cfi_startproc simple
			.cfi_return_column 64
			.cfi_def_cfa $sp, 48
			.cfi_rel_offset 64, 8
			.cfi_rel_offset $gp, 16
			.cfi_rel_offset $16, 24
			.cfi_rel_offset $17, 32
			.cfi_rel_offset $18, 40
			.endm

			.macro CFI_END_OSF_FRAME func
			.cfi_endproc
			.size \func, . - \func
			.endm

	/*		/*
	* This defines the normal kernel pt-regs layout.		* This defines the normal kernel pt-regs layout.
	*		*
	@@ -27,100 +48,158 @@
	* the palcode-provided values are available to the signal handler.		* the palcode-provided values are available to the signal handler.
	*/		*/

	#define SAVE_ALL \		.macro SAVE_ALL
	subq $sp, SP_OFF, $sp; \		subq $sp, SP_OFF, $sp
	stq $0, 0($sp); \		.cfi_adjust_cfa_offset SP_OFF
	stq $1, 8($sp); \		stq $0, 0($sp)
	stq $2, 16($sp); \		stq $1, 8($sp)
	stq $3, 24($sp); \		stq $2, 16($sp)
	stq $4, 32($sp); \		stq $3, 24($sp)
	stq $28, 144($sp); \		stq $4, 32($sp)
	lda $2, alpha_mv; \		stq $28, 144($sp)
	stq $5, 40($sp); \		.cfi_rel_offset $0, 0
	stq $6, 48($sp); \		.cfi_rel_offset $1, 8
	stq $7, 56($sp); \		.cfi_rel_offset $2, 16
	stq $8, 64($sp); \		.cfi_rel_offset $3, 24
	stq $19, 72($sp); \		.cfi_rel_offset $4, 32
	stq $20, 80($sp); \		.cfi_rel_offset $28, 144
	stq $21, 88($sp); \		lda $2, alpha_mv
	ldq $2, HAE_CACHE($2); \		stq $5, 40($sp)
	stq $22, 96($sp); \		stq $6, 48($sp)
	stq $23, 104($sp); \		stq $7, 56($sp)
	stq $24, 112($sp); \		stq $8, 64($sp)
	stq $25, 120($sp); \		stq $19, 72($sp)
	stq $26, 128($sp); \		stq $20, 80($sp)
	stq $27, 136($sp); \		stq $21, 88($sp)
	stq $2, 152($sp); \		ldq $2, HAE_CACHE($2)
	stq $16, 160($sp); \		stq $22, 96($sp)
	stq $17, 168($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)		stq $18, 176($sp)
			.cfi_rel_offset $5, 40
			.cfi_rel_offset $6, 48
			.cfi_rel_offset $7, 56
			.cfi_rel_offset $8, 64
			.cfi_rel_offset $19, 72
			.cfi_rel_offset $20, 80
			.cfi_rel_offset $21, 88
			.cfi_rel_offset $22, 96
			.cfi_rel_offset $23, 104
			.cfi_rel_offset $24, 112
			.cfi_rel_offset $25, 120
			.cfi_rel_offset $26, 128
			.cfi_rel_offset $27, 136
			.endm

	#define RESTORE_ALL \		.macro RESTORE_ALL
	lda $19, alpha_mv; \		lda $19, alpha_mv
	ldq $0, 0($sp); \		ldq $0, 0($sp)
	ldq $1, 8($sp); \		ldq $1, 8($sp)
	ldq $2, 16($sp); \		ldq $2, 16($sp)
	ldq $3, 24($sp); \		ldq $3, 24($sp)
	ldq $21, 152($sp); \		ldq $21, 152($sp)
	ldq $20, HAE_CACHE($19); \		ldq $20, HAE_CACHE($19)
	ldq $4, 32($sp); \		ldq $4, 32($sp)
	ldq $5, 40($sp); \		ldq $5, 40($sp)
	ldq $6, 48($sp); \		ldq $6, 48($sp)
	ldq $7, 56($sp); \		ldq $7, 56($sp)
	subq $20, $21, $20; \		subq $20, $21, $20
	ldq $8, 64($sp); \		ldq $8, 64($sp)
	beq $20, 99f; \		beq $20, 99f
	ldq $20, HAE_REG($19); \		ldq $20, HAE_REG($19)
	stq $21, HAE_CACHE($19); \		stq $21, HAE_CACHE($19)
	stq $21, 0($20); \		stq $21, 0($20)
	99:; \		99: ldq $19, 72($sp)
	ldq $19, 72($sp); \		ldq $20, 80($sp)
	ldq $20, 80($sp); \		ldq $21, 88($sp)
	ldq $21, 88($sp); \		ldq $22, 96($sp)
	ldq $22, 96($sp); \		ldq $23, 104($sp)
	ldq $23, 104($sp); \		ldq $24, 112($sp)
	ldq $24, 112($sp); \		ldq $25, 120($sp)
	ldq $25, 120($sp); \		ldq $26, 128($sp)
	ldq $26, 128($sp); \		ldq $27, 136($sp)
	ldq $27, 136($sp); \		ldq $28, 144($sp)
	ldq $28, 144($sp); \
	addq $sp, SP_OFF, $sp		addq $sp, SP_OFF, $sp
			.cfi_restore $0
			.cfi_restore $1
			.cfi_restore $2
			.cfi_restore $3
			.cfi_restore $4
			.cfi_restore $5
			.cfi_restore $6
			.cfi_restore $7
			.cfi_restore $8
			.cfi_restore $19
			.cfi_restore $20
			.cfi_restore $21
			.cfi_restore $22
			.cfi_restore $23
			.cfi_restore $24
			.cfi_restore $25
			.cfi_restore $26
			.cfi_restore $27
			.cfi_restore $28
			.cfi_adjust_cfa_offset -SP_OFF
			.endm

			.macro DO_SWITCH_STACK
			bsr $1, do_switch_stack
			.cfi_adjust_cfa_offset SWITCH_STACK_SIZE
			.cfi_rel_offset $9, 0
			.cfi_rel_offset $10, 8
			.cfi_rel_offset $11, 16
			.cfi_rel_offset $12, 24
			.cfi_rel_offset $13, 32
			.cfi_rel_offset $14, 40
			.cfi_rel_offset $15, 48
			/* We don't really care about the FP registers for debugging. */
			.endm

			.macro UNDO_SWITCH_STACK
			bsr $1, undo_switch_stack
			.cfi_restore $9
			.cfi_restore $10
			.cfi_restore $11
			.cfi_restore $12
			.cfi_restore $13
			.cfi_restore $14
			.cfi_restore $15
			.cfi_adjust_cfa_offset -SWITCH_STACK_SIZE
			.endm

	/*		/*
	* Non-syscall kernel entry points.		* Non-syscall kernel entry points.
	*/		*/

	.align 4		CFI_START_OSF_FRAME entInt
	.globl entInt
	.ent entInt
	entInt:
	SAVE_ALL		SAVE_ALL
	lda $8, 0x3fff		lda $8, 0x3fff
	lda $26, ret_from_sys_call		lda $26, ret_from_sys_call
	bic $sp, $8, $8		bic $sp, $8, $8
	mov $sp, $19		mov $sp, $19
	jsr $31, do_entInt		jsr $31, do_entInt
	.end entInt		CFI_END_OSF_FRAME entInt

	.align 4		CFI_START_OSF_FRAME entArith
	.globl entArith
	.ent entArith
	entArith:
	SAVE_ALL		SAVE_ALL
	lda $8, 0x3fff		lda $8, 0x3fff
	lda $26, ret_from_sys_call		lda $26, ret_from_sys_call
	bic $sp, $8, $8		bic $sp, $8, $8
	mov $sp, $18		mov $sp, $18
	jsr $31, do_entArith		jsr $31, do_entArith
	.end entArith		CFI_END_OSF_FRAME entArith

	.align 4		CFI_START_OSF_FRAME entMM
	.globl entMM
	.ent entMM
	entMM:
	SAVE_ALL		SAVE_ALL
	/* save $9 - $15 so the inline exception code can manipulate them. */		/* save $9 - $15 so the inline exception code can manipulate them. */
	subq $sp, 56, $sp		subq $sp, 56, $sp
			.cfi_adjust_cfa_offset 56
	stq $9, 0($sp)		stq $9, 0($sp)
	stq $10, 8($sp)		stq $10, 8($sp)
	stq $11, 16($sp)		stq $11, 16($sp)
	@@ -128,6 +207,13 @@ entMM:
	stq $13, 32($sp)		stq $13, 32($sp)
	stq $14, 40($sp)		stq $14, 40($sp)
	stq $15, 48($sp)		stq $15, 48($sp)
			.cfi_rel_offset $9, 0
			.cfi_rel_offset $10, 8
			.cfi_rel_offset $11, 16
			.cfi_rel_offset $12, 24
			.cfi_rel_offset $13, 32
			.cfi_rel_offset $14, 40
			.cfi_rel_offset $15, 48
	addq $sp, 56, $19		addq $sp, 56, $19
	/* handle the fault */		/* handle the fault */
	lda $8, 0x3fff		lda $8, 0x3fff
	@@ -142,28 +228,33 @@ entMM:
	ldq $14, 40($sp)		ldq $14, 40($sp)
	ldq $15, 48($sp)		ldq $15, 48($sp)
	addq $sp, 56, $sp		addq $sp, 56, $sp
			.cfi_restore $9
			.cfi_restore $10
			.cfi_restore $11
			.cfi_restore $12
			.cfi_restore $13
			.cfi_restore $14
			.cfi_restore $15
			.cfi_adjust_cfa_offset -56
	/* finish up the syscall as normal. */		/* finish up the syscall as normal. */
	br ret_from_sys_call		br ret_from_sys_call
	.end entMM		CFI_END_OSF_FRAME entMM

	.align 4		CFI_START_OSF_FRAME entIF
	.globl entIF
	.ent entIF
	entIF:
	SAVE_ALL		SAVE_ALL
	lda $8, 0x3fff		lda $8, 0x3fff
	lda $26, ret_from_sys_call		lda $26, ret_from_sys_call
	bic $sp, $8, $8		bic $sp, $8, $8
	mov $sp, $17		mov $sp, $17
	jsr $31, do_entIF		jsr $31, do_entIF
	.end entIF		CFI_END_OSF_FRAME entIF

	.align 4		CFI_START_OSF_FRAME entUna
	.globl entUna
	.ent entUna
	entUna:
	lda $sp, -256($sp)		lda $sp, -256($sp)
			.cfi_adjust_cfa_offset 256
	stq $0, 0($sp)		stq $0, 0($sp)
			.cfi_rel_offset $0, 0
			.cfi_remember_state
	ldq $0, 256($sp) /* get PS */		ldq $0, 256($sp) /* get PS */
	stq $1, 8($sp)		stq $1, 8($sp)
	stq $2, 16($sp)		stq $2, 16($sp)
	@@ -195,6 +286,32 @@ entUna:
	stq $28, 224($sp)		stq $28, 224($sp)
	mov $sp, $19		mov $sp, $19
	stq $gp, 232($sp)		stq $gp, 232($sp)
			.cfi_rel_offset $1, 1*8
			.cfi_rel_offset $2, 2*8
			.cfi_rel_offset $3, 3*8
			.cfi_rel_offset $4, 4*8
			.cfi_rel_offset $5, 5*8
			.cfi_rel_offset $6, 6*8
			.cfi_rel_offset $7, 7*8
			.cfi_rel_offset $8, 8*8
			.cfi_rel_offset $9, 9*8
			.cfi_rel_offset $10, 10*8
			.cfi_rel_offset $11, 11*8
			.cfi_rel_offset $12, 12*8
			.cfi_rel_offset $13, 13*8
			.cfi_rel_offset $14, 14*8
			.cfi_rel_offset $15, 15*8
			.cfi_rel_offset $19, 19*8
			.cfi_rel_offset $20, 20*8
			.cfi_rel_offset $21, 21*8
			.cfi_rel_offset $22, 22*8
			.cfi_rel_offset $23, 23*8
			.cfi_rel_offset $24, 24*8
			.cfi_rel_offset $25, 25*8
			.cfi_rel_offset $26, 26*8
			.cfi_rel_offset $27, 27*8
			.cfi_rel_offset $28, 28*8
			.cfi_rel_offset $29, 29*8
	lda $8, 0x3fff		lda $8, 0x3fff
	stq $31, 248($sp)		stq $31, 248($sp)
	bic $sp, $8, $8		bic $sp, $8, $8
	@@ -228,16 +345,45 @@ entUna:
	ldq $28, 224($sp)		ldq $28, 224($sp)
	ldq $gp, 232($sp)		ldq $gp, 232($sp)
	lda $sp, 256($sp)		lda $sp, 256($sp)
			.cfi_restore $1
			.cfi_restore $2
			.cfi_restore $3
			.cfi_restore $4
			.cfi_restore $5
			.cfi_restore $6
			.cfi_restore $7
			.cfi_restore $8
			.cfi_restore $9
			.cfi_restore $10
			.cfi_restore $11
			.cfi_restore $12
			.cfi_restore $13
			.cfi_restore $14
			.cfi_restore $15
			.cfi_restore $19
			.cfi_restore $20
			.cfi_restore $21
			.cfi_restore $22
			.cfi_restore $23
			.cfi_restore $24
			.cfi_restore $25
			.cfi_restore $26
			.cfi_restore $27
			.cfi_restore $28
			.cfi_restore $29
			.cfi_adjust_cfa_offset -256
	call_pal PAL_rti		call_pal PAL_rti
	.end entUna

	.align 4		.align 4
	.ent entUnaUser
	entUnaUser:		entUnaUser:
			.cfi_restore_state
	ldq $0, 0($sp) /* restore original $0 */		ldq $0, 0($sp) /* restore original $0 */
	lda $sp, 256($sp) /* pop entUna's stack frame */		lda $sp, 256($sp) /* pop entUna's stack frame */
			.cfi_restore $0
			.cfi_adjust_cfa_offset -256
	SAVE_ALL /* setup normal kernel stack */		SAVE_ALL /* setup normal kernel stack */
	lda $sp, -56($sp)		lda $sp, -56($sp)
			.cfi_adjust_cfa_offset 56
	stq $9, 0($sp)		stq $9, 0($sp)
	stq $10, 8($sp)		stq $10, 8($sp)
	stq $11, 16($sp)		stq $11, 16($sp)
	@@ -245,6 +391,13 @@ entUnaUser:
	stq $13, 32($sp)		stq $13, 32($sp)
	stq $14, 40($sp)		stq $14, 40($sp)
	stq $15, 48($sp)		stq $15, 48($sp)
			.cfi_rel_offset $9, 0
			.cfi_rel_offset $10, 8
			.cfi_rel_offset $11, 16
			.cfi_rel_offset $12, 24
			.cfi_rel_offset $13, 32
			.cfi_rel_offset $14, 40
			.cfi_rel_offset $15, 48
	lda $8, 0x3fff		lda $8, 0x3fff
	addq $sp, 56, $19		addq $sp, 56, $19
	bic $sp, $8, $8		bic $sp, $8, $8
	@@ -257,20 +410,25 @@ entUnaUser:
	ldq $14, 40($sp)		ldq $14, 40($sp)
	ldq $15, 48($sp)		ldq $15, 48($sp)
	lda $sp, 56($sp)		lda $sp, 56($sp)
			.cfi_restore $9
			.cfi_restore $10
			.cfi_restore $11
			.cfi_restore $12
			.cfi_restore $13
			.cfi_restore $14
			.cfi_restore $15
			.cfi_adjust_cfa_offset -56
	br ret_from_sys_call		br ret_from_sys_call
	.end entUnaUser		CFI_END_OSF_FRAME entUna

	.align 4		CFI_START_OSF_FRAME entDbg
	.globl entDbg
	.ent entDbg
	entDbg:
	SAVE_ALL		SAVE_ALL
	lda $8, 0x3fff		lda $8, 0x3fff
	lda $26, ret_from_sys_call		lda $26, ret_from_sys_call
	bic $sp, $8, $8		bic $sp, $8, $8
	mov $sp, $16		mov $sp, $16
	jsr $31, do_entDbg		jsr $31, do_entDbg
	.end entDbg		CFI_END_OSF_FRAME entDbg

	/*		/*
	* The system call entry point is special. Most importantly, it looks		* The system call entry point is special. Most importantly, it looks
	@@ -285,8 +443,12 @@ entDbg:

	.align 4		.align 4
	.globl entSys		.globl entSys
	.globl ret_from_sys_call		.type entSys, @function
	.ent entSys		.cfi_startproc simple
			.cfi_return_column 64
			.cfi_def_cfa $sp, 48
			.cfi_rel_offset 64, 8
			.cfi_rel_offset $gp, 16
	entSys:		entSys:
	SAVE_ALL		SAVE_ALL
	lda $8, 0x3fff		lda $8, 0x3fff
	@@ -300,6 +462,9 @@ entSys:
	stq $17, SP_OFF+32($sp)		stq $17, SP_OFF+32($sp)
	s8addq $0, $5, $5		s8addq $0, $5, $5
	stq $18, SP_OFF+40($sp)		stq $18, SP_OFF+40($sp)
			.cfi_rel_offset $16, SP_OFF+24
			.cfi_rel_offset $17, SP_OFF+32
			.cfi_rel_offset $18, SP_OFF+40
	blbs $3, strace		blbs $3, strace
	beq $4, 1f		beq $4, 1f
	ldq $27, 0($5)		ldq $27, 0($5)
	@@ -310,6 +475,7 @@ entSys:
	stq $31, 72($sp) /* a3=0 => no error */		stq $31, 72($sp) /* a3=0 => no error */

	.align 4		.align 4
			.globl ret_from_sys_call
	ret_from_sys_call:		ret_from_sys_call:
	cmovne $26, 0, $18 /* $18 = 0 => non-restartable */		cmovne $26, 0, $18 /* $18 = 0 => non-restartable */
	ldq $0, SP_OFF($sp)		ldq $0, SP_OFF($sp)
	@@ -324,10 +490,12 @@ ret_to_user:
	and $17, _TIF_WORK_MASK, $2		and $17, _TIF_WORK_MASK, $2
	bne $2, work_pending		bne $2, work_pending
	restore_all:		restore_all:
			.cfi_remember_state
	RESTORE_ALL		RESTORE_ALL
	call_pal PAL_rti		call_pal PAL_rti

	ret_to_kernel:		ret_to_kernel:
			.cfi_restore_state
	lda $16, 7		lda $16, 7
	call_pal PAL_swpipl		call_pal PAL_swpipl
	br restore_all		br restore_all
	@@ -356,7 +524,6 @@ $ret_success:
	stq $0, 0($sp)		stq $0, 0($sp)
	stq $31, 72($sp) /* a3=0 => no error */		stq $31, 72($sp) /* a3=0 => no error */
	br ret_from_sys_call		br ret_from_sys_call
	.end entSys

	/*		/*
	* Do all cleanup when returning from all interrupts and system calls.		* Do all cleanup when returning from all interrupts and system calls.
	@@ -370,7 +537,7 @@ $ret_success:
	*/		*/

	.align 4		.align 4
	.ent work_pending		.type work_pending, @function
	work_pending:		work_pending:
	and $17, _TIF_NOTIFY_RESUME \| _TIF_SIGPENDING, $2		and $17, _TIF_NOTIFY_RESUME \| _TIF_SIGPENDING, $2
	bne $2, $work_notifysig		bne $2, $work_notifysig
	@@ -387,23 +554,22 @@ $work_resched:

	$work_notifysig:		$work_notifysig:
	mov $sp, $16		mov $sp, $16
	bsr $1, do_switch_stack		DO_SWITCH_STACK
	jsr $26, do_work_pending		jsr $26, do_work_pending
	bsr $1, undo_switch_stack		UNDO_SWITCH_STACK
	br restore_all		br restore_all
	.end work_pending

	/*		/*
	* PTRACE syscall handler		* PTRACE syscall handler
	*/		*/

	.align 4		.align 4
	.ent strace		.type strace, @function
	strace:		strace:
	/* set up signal stack, call syscall_trace */		/* set up signal stack, call syscall_trace */
	bsr $1, do_switch_stack		DO_SWITCH_STACK
	jsr $26, syscall_trace_enter /* returns the syscall number */		jsr $26, syscall_trace_enter /* returns the syscall number */
	bsr $1, undo_switch_stack		UNDO_SWITCH_STACK

	/* get the arguments back.. */		/* get the arguments back.. */
	ldq $16, SP_OFF+24($sp)		ldq $16, SP_OFF+24($sp)
	@@ -431,9 +597,9 @@ ret_from_straced:
	$strace_success:		$strace_success:
	stq $0, 0($sp) /* save return value */		stq $0, 0($sp) /* save return value */

	bsr $1, do_switch_stack		DO_SWITCH_STACK
	jsr $26, syscall_trace_leave		jsr $26, syscall_trace_leave
	bsr $1, undo_switch_stack		UNDO_SWITCH_STACK
	br $31, ret_from_sys_call		br $31, ret_from_sys_call

	.align 3		.align 3
	@@ -447,26 +613,31 @@ $strace_error:
	stq $0, 0($sp)		stq $0, 0($sp)
	stq $1, 72($sp) /* a3 for return */		stq $1, 72($sp) /* a3 for return */

	bsr $1, do_switch_stack		DO_SWITCH_STACK
	mov $18, $9 /* save old syscall number */		mov $18, $9 /* save old syscall number */
	mov $19, $10 /* save old a3 */		mov $19, $10 /* save old a3 */
	jsr $26, syscall_trace_leave		jsr $26, syscall_trace_leave
	mov $9, $18		mov $9, $18
	mov $10, $19		mov $10, $19
	bsr $1, undo_switch_stack		UNDO_SWITCH_STACK

	mov $31, $26 /* tell "ret_from_sys_call" we can restart */		mov $31, $26 /* tell "ret_from_sys_call" we can restart */
	br ret_from_sys_call		br ret_from_sys_call
	.end strace		CFI_END_OSF_FRAME entSys

	/*		/*
	* Save and restore the switch stack -- aka the balance of the user context.		* Save and restore the switch stack -- aka the balance of the user context.
	*/		*/

	.align 4		.align 4
	.ent do_switch_stack		.type do_switch_stack, @function
			.cfi_startproc simple
			.cfi_return_column 64
			.cfi_def_cfa $sp, 0
			.cfi_register 64, $1
	do_switch_stack:		do_switch_stack:
	lda $sp, -SWITCH_STACK_SIZE($sp)		lda $sp, -SWITCH_STACK_SIZE($sp)
			.cfi_adjust_cfa_offset SWITCH_STACK_SIZE
	stq $9, 0($sp)		stq $9, 0($sp)
	stq $10, 8($sp)		stq $10, 8($sp)
	stq $11, 16($sp)		stq $11, 16($sp)
	@@ -510,10 +681,14 @@ do_switch_stack:
	stt $f0, 312($sp) # save fpcr in slot of $f31		stt $f0, 312($sp) # save fpcr in slot of $f31
	ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state.		ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state.
	ret $31, ($1), 1		ret $31, ($1), 1
	.end do_switch_stack		.cfi_endproc
			.size do_switch_stack, .-do_switch_stack

	.align 4		.align 4
	.ent undo_switch_stack		.type undo_switch_stack, @function
			.cfi_startproc simple
			.cfi_def_cfa $sp, 0
			.cfi_register 64, $1
	undo_switch_stack:		undo_switch_stack:
	ldq $9, 0($sp)		ldq $9, 0($sp)
	ldq $10, 8($sp)		ldq $10, 8($sp)
	@@ -558,7 +733,8 @@ undo_switch_stack:
	ldt $f30, 304($sp)		ldt $f30, 304($sp)
	lda $sp, SWITCH_STACK_SIZE($sp)		lda $sp, SWITCH_STACK_SIZE($sp)
	ret $31, ($1), 1		ret $31, ($1), 1
	.end undo_switch_stack		.cfi_endproc
			.size undo_switch_stack, .-undo_switch_stack

	/*		/*
	* The meat of the context switch code.		* The meat of the context switch code.
	@@ -566,17 +742,18 @@ undo_switch_stack:

	.align 4		.align 4
	.globl alpha_switch_to		.globl alpha_switch_to
	.ent alpha_switch_to		.type alpha_switch_to, @function
			.cfi_startproc
	alpha_switch_to:		alpha_switch_to:
	.prologue 0		DO_SWITCH_STACK
	bsr $1, do_switch_stack
	call_pal PAL_swpctx		call_pal PAL_swpctx
	lda $8, 0x3fff		lda $8, 0x3fff
	bsr $1, undo_switch_stack		UNDO_SWITCH_STACK
	bic $sp, $8, $8		bic $sp, $8, $8
	mov $17, $0		mov $17, $0
	ret		ret
	.end alpha_switch_to		.cfi_endproc
			.size alpha_switch_to, .-alpha_switch_to

	/*		/*
	* New processes begin life here.		* New processes begin life here.