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

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

Acked-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
tirimbino
Richard Henderson 14 years ago committed by Matt Turner
parent 748a76b515
commit 231b0bedf5
1 changed files with 288 additions and 111 deletions
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  1. 399
      arch/alpha/kernel/entry.S

399
arch/alpha/kernel/entry.S
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@ -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.

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