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-rw-r--r--arch/loongarch/include/asm/stacktrace.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/stacktrace.h b/arch/loongarch/include/asm/stacktrace.h
new file mode 100644
index 000000000..f23adb15f
--- /dev/null
+++ b/arch/loongarch/include/asm/stacktrace.h
@@ -0,0 +1,94 @@
+/* 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>
+
+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;
+};
+
+struct stack_frame {
+ unsigned long fp;
+ unsigned long ra;
+};
+
+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);
+
+#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__(
+ /* Save $ra */
+ STORE_ONE_REG(1)
+ /* 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"
+ 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 */