mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-01 08:54:25 +08:00
93a4fa622e
1. Use common arch_stack_walk() infrastructure to avoid duplicated code and avoid taking care of the stack storage and filtering. 2. Add sched_ra (means sched return address) and sched_cfa (means sched call frame address) to thread_info, and store them in switch_to(). 3. Add __get_wchan() implementation. Now we can print the process stack and wait channel by cat /proc/*/stack and /proc/*/wchan. Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
38 lines
844 B
ArmAsm
38 lines
844 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
|
|
*/
|
|
#include <asm/asm.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/loongarch.h>
|
|
#include <asm/regdef.h>
|
|
#include <asm/stackframe.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
/*
|
|
* task_struct *__switch_to(task_struct *prev, task_struct *next,
|
|
* struct thread_info *next_ti)
|
|
*/
|
|
.align 5
|
|
SYM_FUNC_START(__switch_to)
|
|
csrrd t1, LOONGARCH_CSR_PRMD
|
|
stptr.d t1, a0, THREAD_CSRPRMD
|
|
|
|
cpu_save_nonscratch a0
|
|
stptr.d ra, a0, THREAD_REG01
|
|
stptr.d a3, a0, THREAD_SCHED_RA
|
|
stptr.d a4, a0, THREAD_SCHED_CFA
|
|
move tp, a2
|
|
cpu_restore_nonscratch a1
|
|
|
|
li.w t0, _THREAD_SIZE - 32
|
|
PTR_ADD t0, t0, tp
|
|
set_saved_sp t0, t1, t2
|
|
|
|
ldptr.d t1, a1, THREAD_CSRPRMD
|
|
csrwr t1, LOONGARCH_CSR_PRMD
|
|
|
|
jr ra
|
|
SYM_FUNC_END(__switch_to)
|