From: AKASHI Takahiro <takahiro.akashi@linaro.org>
Date: Tue, 15 Dec 2015 08:33:40 +0000 (+0900)
Subject: UPSTREAM: arm64: pass a task parameter to unwind_frame()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6adbc95c63d8b5a2873865ee8b6a4092ac95a0e9;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git
UPSTREAM: arm64: pass a task parameter to unwind_frame()
Function graph tracer modifies a return address (LR) in a stack frame
to hook a function's return. This will result in many useless entries
(return_to_handler) showing up in a call stack list.
We will fix this problem in a later patch ("arm64: ftrace: fix a stack
tracer's output under function graph tracer"). But since real return
addresses are saved in ret_stack[] array in struct task_struct,
unwind functions need to be notified of, in addition to a stack pointer
address, which task is being traced in order to find out real return
addresses.
This patch extends unwind functions' interfaces by adding an extra
argument of a pointer to task_struct.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 30369029
Patchset: rework-pagetable
(cherry picked from commit fe13f95b720075327a761fe6ddb45b0c90cab504)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I92a9a07468c182d5abbacaa73a90984ab11ad535
---
diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index 7318f6d54aa9..6fb61c5090b4 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -16,14 +16,16 @@
#ifndef __ASM_STACKTRACE_H
#define __ASM_STACKTRACE_H
+struct task_struct;
+
struct stackframe {
unsigned long fp;
unsigned long sp;
unsigned long pc;
};
-extern int unwind_frame(struct stackframe *frame);
-extern void walk_stackframe(struct stackframe *frame,
+extern int unwind_frame(struct task_struct *tsk, struct stackframe *frame);
+extern void walk_stackframe(struct task_struct *tsk, struct stackframe *frame,
int (*fn)(struct stackframe *, void *), void *data);
#endif /* __ASM_STACKTRACE_H */
diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_callchain.c
index 3aa74830cc69..797220da912b 100644
--- a/arch/arm64/kernel/perf_callchain.c
+++ b/arch/arm64/kernel/perf_callchain.c
@@ -165,7 +165,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
frame.sp = regs->sp;
frame.pc = regs->pc;
- walk_stackframe(&frame, callchain_trace, entry);
+ walk_stackframe(current, &frame, callchain_trace, entry);
}
unsigned long perf_instruction_pointer(struct pt_regs *regs)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 62068ded1e90..51be6356fb03 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -414,7 +414,7 @@ unsigned long get_wchan(struct task_struct *p)
do {
if (frame.sp < stack_page ||
frame.sp >= stack_page + THREAD_SIZE ||
- unwind_frame(&frame))
+ unwind_frame(p, &frame))
return 0;
if (!in_sched_functions(frame.pc))
return frame.pc;
diff --git a/arch/arm64/kernel/return_address.c b/arch/arm64/kernel/return_address.c
index 6c4fd2810ecb..07b37ac05be4 100644
--- a/arch/arm64/kernel/return_address.c
+++ b/arch/arm64/kernel/return_address.c
@@ -44,7 +44,7 @@ void *return_address(unsigned int level)
frame.sp = current_stack_pointer;
frame.pc = (unsigned long)return_address; /* dummy */
- walk_stackframe(&frame, save_return_addr, &data);
+ walk_stackframe(current, &frame, save_return_addr, &data);
if (!data.level)
return data.addr;
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index b9fd3a8abfc1..f7ee597ec883 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -36,7 +36,7 @@
* ldp x29, x30, [sp]
* add sp, sp, #0x10
*/
-int notrace unwind_frame(struct stackframe *frame)
+int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
{
unsigned long high, low;
unsigned long fp = frame->fp;
@@ -99,7 +99,7 @@ int notrace unwind_frame(struct stackframe *frame)
return 0;
}
-void notrace walk_stackframe(struct stackframe *frame,
+void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame,
int (*fn)(struct stackframe *, void *), void *data)
{
while (1) {
@@ -107,7 +107,7 @@ void notrace walk_stackframe(struct stackframe *frame,
if (fn(frame, data))
break;
- ret = unwind_frame(frame);
+ ret = unwind_frame(tsk, frame);
if (ret < 0)
break;
}
@@ -159,7 +159,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
frame.pc = (unsigned long)save_stack_trace_tsk;
}
- walk_stackframe(&frame, save_trace, &data);
+ walk_stackframe(tsk, &frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
index 13339b6ffc1a..6e5c521f123a 100644
--- a/arch/arm64/kernel/time.c
+++ b/arch/arm64/kernel/time.c
@@ -53,7 +53,7 @@ unsigned long profile_pc(struct pt_regs *regs)
frame.sp = regs->sp;
frame.pc = regs->pc;
do {
- int ret = unwind_frame(&frame);
+ int ret = unwind_frame(NULL, &frame);
if (ret < 0)
return 0;
} while (in_lock_functions(frame.pc));
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 8a0084541f84..937008523fa5 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -177,7 +177,7 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
int ret;
dump_backtrace_entry(where);
- ret = unwind_frame(&frame);
+ ret = unwind_frame(tsk, &frame);
if (ret < 0)
break;
stack = frame.sp;