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acrn-kernel/arch/loongarch/include/asm/stacktrace.h

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LoongArch: Add exception/interrupt handling Add the exception and interrupt handling machanism for basic LoongArch support. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-05-31 18:04:11 +08:00
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_STACKTRACE_H
#define _ASM_STACKTRACE_H
#include <asm/asm.h>
#include <asm/ptrace.h>
#include <asm/loongarch.h>
#include <linux/stringify.h>
LoongArch: Add guess unwinder support Name "guess unwinder" comes from x86, it scans the stack and reports every kernel text address it finds. Unwinders can be used by dump_stack() and other stacktrace functions. Three stages when we do unwind, 1) unwind_start(), the prapare of unwinding, fill unwind_state. 2) unwind_done(), judge whether the unwind process is finished or not. 3) unwind_next_frame(), unwind the next frame. Add get_stack_info() to get stack info. At present we have irq stack and task stack. The next_sp is the key info between two types of stacks. Dividing unwinder helps to add new unwinders in the future. Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-08-06 16:10:02 +08:00
enum stack_type {
STACK_TYPE_UNKNOWN,
STACK_TYPE_IRQ,
STACK_TYPE_TASK,
};
struct stack_info {
enum stack_type type;
unsigned long begin, end, next_sp;
};
LoongArch: Add USER_STACKTRACE support To get the best stacktrace output, you can compile your userspace programs with frame pointers (at least glibc + the app you are tracing). 1, export "CC = gcc -fno-omit-frame-pointer"; 2, compile your programs with "CC"; 3, use uprobe to get stacktrace output. ... echo 'p:malloc /usr/lib64/libc.so.6:0x0a4704 size=%r4:u64' > uprobe_events echo 'p:free /usr/lib64/libc.so.6:0x0a4d50 ptr=%r4:x64' >> uprobe_events echo 'comm == "demo"' > ./events/uprobes/malloc/filter echo 'comm == "demo"' > ./events/uprobes/free/filter echo 1 > ./options/userstacktrace echo 1 > ./options/sym-userobj ... Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-08-06 16:10:05 +08:00
struct stack_frame {
unsigned long fp;
unsigned long ra;
};
LoongArch: Add guess unwinder support Name "guess unwinder" comes from x86, it scans the stack and reports every kernel text address it finds. Unwinders can be used by dump_stack() and other stacktrace functions. Three stages when we do unwind, 1) unwind_start(), the prapare of unwinding, fill unwind_state. 2) unwind_done(), judge whether the unwind process is finished or not. 3) unwind_next_frame(), unwind the next frame. Add get_stack_info() to get stack info. At present we have irq stack and task stack. The next_sp is the key info between two types of stacks. Dividing unwinder helps to add new unwinders in the future. Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-08-06 16:10:02 +08:00
bool in_irq_stack(unsigned long stack, struct stack_info *info);
bool in_task_stack(unsigned long stack, struct task_struct *task, struct stack_info *info);
int get_stack_info(unsigned long stack, struct task_struct *task, struct stack_info *info);
LoongArch: Add exception/interrupt handling Add the exception and interrupt handling machanism for basic LoongArch support. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-05-31 18:04:11 +08:00
#define STR_LONG_L __stringify(LONG_L)
#define STR_LONG_S __stringify(LONG_S)
#define STR_LONGSIZE __stringify(LONGSIZE)
#define STORE_ONE_REG(r) \
STR_LONG_S " $r" __stringify(r)", %1, "STR_LONGSIZE"*"__stringify(r)"\n\t"
#define CSRRD_ONE_REG(reg) \
__stringify(csrrd) " %0, "__stringify(reg)"\n\t"
static __always_inline void prepare_frametrace(struct pt_regs *regs)
{
__asm__ __volatile__(
LoongArch: Use ABI names of registers where appropriate Some of the assembly in the LoongArch port seem to come from a prehistoric time, when the assembler didn't even have support for the ABI names we all come to know and love, thus used raw register numbers which hampered readability. The usages are found with a regex match inside arch/loongarch, then manually adjusted for those non-definitions. Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-07-26 23:57:16 +08:00
/* Save $ra */
LoongArch: Add exception/interrupt handling Add the exception and interrupt handling machanism for basic LoongArch support. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-05-31 18:04:11 +08:00
STORE_ONE_REG(1)
LoongArch: Use ABI names of registers where appropriate Some of the assembly in the LoongArch port seem to come from a prehistoric time, when the assembler didn't even have support for the ABI names we all come to know and love, thus used raw register numbers which hampered readability. The usages are found with a regex match inside arch/loongarch, then manually adjusted for those non-definitions. Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-07-26 23:57:16 +08:00
/* Use $ra to save PC */
"pcaddi $ra, 0\n\t"
STR_LONG_S " $ra, %0\n\t"
/* Restore $ra */
STR_LONG_L " $ra, %1, "STR_LONGSIZE"\n\t"
LoongArch: Add exception/interrupt handling Add the exception and interrupt handling machanism for basic LoongArch support. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-05-31 18:04:11 +08:00
STORE_ONE_REG(2)
STORE_ONE_REG(3)
STORE_ONE_REG(4)
STORE_ONE_REG(5)
STORE_ONE_REG(6)
STORE_ONE_REG(7)
STORE_ONE_REG(8)
STORE_ONE_REG(9)
STORE_ONE_REG(10)
STORE_ONE_REG(11)
STORE_ONE_REG(12)
STORE_ONE_REG(13)
STORE_ONE_REG(14)
STORE_ONE_REG(15)
STORE_ONE_REG(16)
STORE_ONE_REG(17)
STORE_ONE_REG(18)
STORE_ONE_REG(19)
STORE_ONE_REG(20)
STORE_ONE_REG(21)
STORE_ONE_REG(22)
STORE_ONE_REG(23)
STORE_ONE_REG(24)
STORE_ONE_REG(25)
STORE_ONE_REG(26)
STORE_ONE_REG(27)
STORE_ONE_REG(28)
STORE_ONE_REG(29)
STORE_ONE_REG(30)
STORE_ONE_REG(31)
: "=m" (regs->csr_era)
: "r" (regs->regs)
: "memory");
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_BADV) : "=r" (regs->csr_badvaddr));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_CRMD) : "=r" (regs->csr_crmd));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_PRMD) : "=r" (regs->csr_prmd));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_EUEN) : "=r" (regs->csr_euen));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ECFG) : "=r" (regs->csr_ecfg));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ESTAT) : "=r" (regs->csr_estat));
}
#endif /* _ASM_STACKTRACE_H */