Commit 231b0bed authored by Richard Henderson's avatar Richard Henderson Committed by Matt Turner
Browse files

alpha: Generate dwarf2 unwind info for various kernel entry points. 



Having unwind info past the PALcode generated stack frame makes
debugging the kernel significantly easier.

Acked-by: default avatarMatt Turner <mattst88@gmail.com>
Signed-off-by: default avatarMatt Turner <mattst88@gmail.com>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 748a76b5

arch/alpha/kernel/entry.S

+288 −111
Original line number Diff line number Diff line
@@ -12,11 +12,32 @@ 


	.text

	.set noat

	.cfi_sections	.debug_frame



/* Stack offsets.  */

#define SP_OFF			184

#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.

 *
@@ -27,100 +48,158 @@ 
 * the palcode-provided values are available to the signal handler.

 */



#define SAVE_ALL			\

	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);		\

.macro	SAVE_ALL

	subq	$sp, SP_OFF, $sp

	.cfi_adjust_cfa_offset	SP_OFF

	stq	$0, 0($sp)

	stq	$1, 8($sp)

	stq	$2, 16($sp)

	stq	$3, 24($sp)

	stq	$4, 32($sp)

	stq	$28, 144($sp)

	.cfi_rel_offset	$0, 0

	.cfi_rel_offset $1, 8

	.cfi_rel_offset	$2, 16

	.cfi_rel_offset	$3, 24

	.cfi_rel_offset	$4, 32

	.cfi_rel_offset	$28, 144

	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)

	.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			\

	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);		\

99:;					\

	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);		\

.macro	RESTORE_ALL

	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)

99:	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

	.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.

 */



	.align	4

	.globl	entInt

	.ent	entInt

entInt:

CFI_START_OSF_FRAME entInt

	SAVE_ALL

	lda	$8, 0x3fff

	lda	$26, ret_from_sys_call

	bic	$sp, $8, $8

	mov	$sp, $19

	jsr	$31, do_entInt

.end entInt

CFI_END_OSF_FRAME entInt



	.align	4

	.globl	entArith

	.ent	entArith

entArith:

CFI_START_OSF_FRAME 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

CFI_END_OSF_FRAME entArith



	.align	4

	.globl	entMM

	.ent	entMM

entMM:

CFI_START_OSF_FRAME entMM

	SAVE_ALL

/* save $9 - $15 so the inline exception code can manipulate them.  */

	subq	$sp, 56, $sp

	.cfi_adjust_cfa_offset	56

	stq	$9, 0($sp)

	stq	$10, 8($sp)

	stq	$11, 16($sp)
@@ -128,6 +207,13 @@ entMM: 
	stq	$13, 32($sp)

	stq	$14, 40($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

/* handle the fault */

	lda	$8, 0x3fff
@@ -142,28 +228,33 @@ entMM: 
	ldq	$14, 40($sp)

	ldq	$15, 48($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.  */

	br	ret_from_sys_call

.end entMM

CFI_END_OSF_FRAME entMM



	.align	4

	.globl	entIF

	.ent	entIF

entIF:

CFI_START_OSF_FRAME entIF

	SAVE_ALL

	lda	$8, 0x3fff

	lda	$26, ret_from_sys_call

	bic	$sp, $8, $8

	mov	$sp, $17

	jsr	$31, do_entIF

.end entIF

CFI_END_OSF_FRAME entIF



	.align	4

	.globl	entUna

	.ent	entUna

entUna:

CFI_START_OSF_FRAME entUna

	lda	$sp, -256($sp)

	.cfi_adjust_cfa_offset	256

	stq	$0, 0($sp)

	.cfi_rel_offset	$0, 0

	.cfi_remember_state

	ldq	$0, 256($sp)	/* get PS */

	stq	$1, 8($sp)

	stq	$2, 16($sp)
@@ -195,6 +286,32 @@ entUna: 
	stq	$28, 224($sp)

	mov	$sp, $19

	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

	stq	$31, 248($sp)

	bic	$sp, $8, $8
@@ -228,16 +345,45 @@ entUna: 
	ldq	$28, 224($sp)

	ldq	$gp, 232($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

.end entUna



	.align	4

	.ent	entUnaUser

entUnaUser:

	.cfi_restore_state

	ldq	$0, 0($sp)	/* restore original $0 */

	lda	$sp, 256($sp)	/* pop entUna's stack frame */

	.cfi_restore	$0

	.cfi_adjust_cfa_offset	-256

	SAVE_ALL		/* setup normal kernel stack */

	lda	$sp, -56($sp)

	.cfi_adjust_cfa_offset	56

	stq	$9, 0($sp)

	stq	$10, 8($sp)

	stq	$11, 16($sp)
@@ -245,6 +391,13 @@ entUnaUser: 
	stq	$13, 32($sp)

	stq	$14, 40($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

	addq	$sp, 56, $19

	bic	$sp, $8, $8
@@ -257,20 +410,25 @@ entUnaUser: 
	ldq	$14, 40($sp)

	ldq	$15, 48($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

.end entUnaUser

CFI_END_OSF_FRAME entUna



	.align	4

	.globl	entDbg

	.ent	entDbg

entDbg:

CFI_START_OSF_FRAME entDbg

	SAVE_ALL

	lda	$8, 0x3fff

	lda	$26, ret_from_sys_call

	bic	$sp, $8, $8

	mov	$sp, $16

	jsr	$31, do_entDbg

.end entDbg

CFI_END_OSF_FRAME entDbg



/*

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


	.align	4

	.globl	entSys

	.globl	ret_from_sys_call

	.ent	entSys

	.type	entSys, @function

	.cfi_startproc simple

	.cfi_return_column 64

	.cfi_def_cfa	$sp, 48

	.cfi_rel_offset	64, 8

	.cfi_rel_offset	$gp, 16

entSys:

	SAVE_ALL

	lda	$8, 0x3fff
@@ -300,6 +462,9 @@ entSys: 
	stq	$17, SP_OFF+32($sp)

	s8addq	$0, $5, $5

	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

	beq	$4, 1f

	ldq	$27, 0($5)
@@ -310,6 +475,7 @@ entSys: 
	stq	$31, 72($sp)		/* a3=0 => no error */



	.align	4

	.globl	ret_from_sys_call

ret_from_sys_call:

	cmovne	$26, 0, $18		/* $18 = 0 => non-restartable */

	ldq	$0, SP_OFF($sp)
@@ -324,10 +490,12 @@ ret_to_user: 
	and	$17, _TIF_WORK_MASK, $2

	bne	$2, work_pending

restore_all:

	.cfi_remember_state

	RESTORE_ALL

	call_pal PAL_rti



ret_to_kernel:

	.cfi_restore_state

	lda	$16, 7

	call_pal PAL_swpipl

	br restore_all
@@ -356,7 +524,6 @@ $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.
@@ -370,7 +537,7 @@ $ret_success: 
 */



	.align	4

	.ent	work_pending

	.type	work_pending, @function

work_pending:

	and	$17, _TIF_NOTIFY_RESUME | _TIF_SIGPENDING, $2

	bne	$2, $work_notifysig
@@ -387,23 +554,22 @@ $work_resched: 


$work_notifysig:

	mov	$sp, $16

	bsr	$1, do_switch_stack

	DO_SWITCH_STACK

	jsr	$26, do_work_pending

	bsr	$1, undo_switch_stack

	UNDO_SWITCH_STACK

	br	restore_all

.end work_pending



/*

 * PTRACE syscall handler

 */



	.align	4

	.ent	strace

	.type	strace, @function

strace:

	/* set up signal stack, call syscall_trace */

	bsr	$1, do_switch_stack

	DO_SWITCH_STACK

	jsr	$26, syscall_trace_enter /* returns the syscall number */

	bsr	$1, undo_switch_stack

	UNDO_SWITCH_STACK



	/* get the arguments back.. */

	ldq	$16, SP_OFF+24($sp)
@@ -431,9 +597,9 @@ ret_from_straced: 
$strace_success:

	stq	$0, 0($sp)		/* save return value */



	bsr	$1, do_switch_stack

	DO_SWITCH_STACK

	jsr	$26, syscall_trace_leave

	bsr	$1, undo_switch_stack

	UNDO_SWITCH_STACK

	br	$31, ret_from_sys_call



	.align	3
@@ -447,26 +613,31 @@ $strace_error: 
	stq	$0, 0($sp)

	stq	$1, 72($sp)	/* a3 for return */



	bsr	$1, do_switch_stack

	DO_SWITCH_STACK

	mov	$18, $9		/* save old syscall number */

	mov	$19, $10	/* save old a3 */

	jsr	$26, syscall_trace_leave

	mov	$9, $18

	mov	$10, $19

	bsr	$1, undo_switch_stack

	UNDO_SWITCH_STACK



	mov	$31, $26	/* tell "ret_from_sys_call" we can restart */

	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.

 */



	.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:

	lda	$sp, -SWITCH_STACK_SIZE($sp)

	.cfi_adjust_cfa_offset	SWITCH_STACK_SIZE

	stq	$9, 0($sp)

	stq	$10, 8($sp)

	stq	$11, 16($sp)
@@ -510,10 +681,14 @@ do_switch_stack: 
	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

	.cfi_endproc

	.size	do_switch_stack, .-do_switch_stack



	.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:

	ldq	$9, 0($sp)

	ldq	$10, 8($sp)
@@ -558,7 +733,8 @@ undo_switch_stack: 
	ldt	$f30, 304($sp)

	lda	$sp, SWITCH_STACK_SIZE($sp)

	ret	$31, ($1), 1

.end undo_switch_stack

	.cfi_endproc

	.size	undo_switch_stack, .-undo_switch_stack



/*

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


	.align	4

	.globl	alpha_switch_to

	.ent	alpha_switch_to

	.type	alpha_switch_to, @function

	.cfi_startproc

alpha_switch_to:

	.prologue 0

	bsr	$1, do_switch_stack

	DO_SWITCH_STACK

	call_pal PAL_swpctx

	lda	$8, 0x3fff

	bsr	$1, undo_switch_stack

	UNDO_SWITCH_STACK

	bic	$sp, $8, $8

	mov	$17, $0

	ret

.end alpha_switch_to

	.cfi_endproc

	.size	alpha_switch_to, .-alpha_switch_to



/*

 * New processes begin life here.