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csky: Fixup add zero_fp fixup perf backtrace panic

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We need set fp zero to let backtrace know the end. The patch fixup perf
callchain panic problem, because backtrace didn't know what is the end
of fp.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reported-by: Mao Han <han_mao@c-sky.com>
This commit is contained in:
Guo Ren 2019-09-25 19:56:16 +08:00
parent fdbdcddc2c
commit 48ede51fd9
2 changed files with 31 additions and 21 deletions
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50
arch/csky/kernel/entry.S
View File

@ -17,6 +17,12 @@
#define PTE_INDX_SHIFT 10
#define _PGDIR_SHIFT 22
.macro zero_fp
#ifdef CONFIG_STACKTRACE
movi r8, 0
#endif
.endm
.macro tlbop_begin name, val0, val1, val2
ENTRY(csky_\name)
mtcr a3, ss2
@ -96,6 +102,7 @@ ENTRY(csky_\name)
SAVE_ALL 0
.endm
.macro tlbop_end is_write
zero_fp
RD_MEH a2
psrset ee, ie
mov a0, sp
@ -120,6 +127,7 @@ tlbop_end 1
ENTRY(csky_systemcall)
SAVE_ALL TRAP0_SIZE
zero_fp
psrset ee, ie
@ -136,9 +144,9 @@ ENTRY(csky_systemcall)
mov r9, sp
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r8, (r9, TINFO_FLAGS)
ANDI_R3 r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
cmpnei r8, 0
ldw r12, (r9, TINFO_FLAGS)
ANDI_R3 r12, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
cmpnei r12, 0
bt csky_syscall_trace
#if defined(__CSKYABIV2__)
subi sp, 8
@ -180,7 +188,7 @@ csky_syscall_trace:
ENTRY(ret_from_kernel_thread)
jbsr schedule_tail
mov a0, r8
mov a0, r10
jsr r9
jbsr ret_from_exception
@ -189,9 +197,9 @@ ENTRY(ret_from_fork)
mov r9, sp
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r8, (r9, TINFO_FLAGS)
ANDI_R3 r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
cmpnei r8, 0
ldw r12, (r9, TINFO_FLAGS)
ANDI_R3 r12, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
cmpnei r12, 0
bf ret_from_exception
mov a0, sp /* sp = pt_regs pointer */
jbsr syscall_trace_exit
@ -209,9 +217,9 @@ ret_from_exception:
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r8, (r9, TINFO_FLAGS)
andi r8, (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED)
cmpnei r8, 0
ldw r12, (r9, TINFO_FLAGS)
andi r12, (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED)
cmpnei r12, 0
bt exit_work
1:
RESTORE_ALL
@ -220,11 +228,11 @@ exit_work:
lrw syscallid, ret_from_exception
mov lr, syscallid
btsti r8, TIF_NEED_RESCHED
btsti r12, TIF_NEED_RESCHED
bt work_resched
mov a0, sp
mov a1, r8
mov a1, r12
jmpi do_notify_resume
work_resched:
@ -232,6 +240,7 @@ work_resched:
ENTRY(csky_trap)
SAVE_ALL 0
zero_fp
psrset ee
mov a0, sp /* Push Stack pointer arg */
jbsr trap_c /* Call C-level trap handler */
@ -265,6 +274,7 @@ ENTRY(csky_get_tls)
ENTRY(csky_irq)
SAVE_ALL 0
zero_fp
psrset ee
#ifdef CONFIG_PREEMPT
@ -276,21 +286,21 @@ ENTRY(csky_irq)
* Get task_struct->stack.preempt_count for current,
* and increase 1.
*/
ldw r8, (r9, TINFO_PREEMPT)
addi r8, 1
stw r8, (r9, TINFO_PREEMPT)
ldw r12, (r9, TINFO_PREEMPT)
addi r12, 1
stw r12, (r9, TINFO_PREEMPT)
#endif
mov a0, sp
jbsr csky_do_IRQ
#ifdef CONFIG_PREEMPT
subi r8, 1
stw r8, (r9, TINFO_PREEMPT)
cmpnei r8, 0
subi r12, 1
stw r12, (r9, TINFO_PREEMPT)
cmpnei r12, 0
bt 2f
ldw r8, (r9, TINFO_FLAGS)
btsti r8, TIF_NEED_RESCHED
ldw r12, (r9, TINFO_FLAGS)
btsti r12, TIF_NEED_RESCHED
bf 2f
1:
jbsr preempt_schedule_irq /* irq en/disable is done inside */

2
arch/csky/kernel/process.c
View File

@ -55,7 +55,7 @@ int copy_thread(unsigned long clone_flags,
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
childstack->r15 = (unsigned long) ret_from_kernel_thread;
childstack->r8 = kthread_arg;
childstack->r10 = kthread_arg;
childstack->r9 = usp;
childregs->sr = mfcr("psr");
} else {