/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_BUG_H
#define _ASM_RISCV_BUG_H

#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/types.h>

#include <asm/asm.h>

#define __INSN_LENGTH_MASK  _UL(0x3)
#define __INSN_LENGTH_32    _UL(0x3)
#define __COMPRESSED_INSN_MASK  _UL(0xffff)

#define __BUG_INSN_32   _UL(0x00100073) /* ebreak */
#define __BUG_INSN_16   _UL(0x9002) /* c.ebreak */

#define GET_INSN_LENGTH(insn)                                           \
({                                                                      \
        unsigned long __len;                                            \
        __len = ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ?     \
                4UL : 2UL;                                              \
        __len;                                                          \
})

typedef u32 bug_insn_t;

#ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
#define __BUG_ENTRY_ADDR        RISCV_INT " 1b - ."
#define __BUG_ENTRY_FILE(file)  RISCV_INT " " file " - ."
#else
#define __BUG_ENTRY_ADDR        RISCV_PTR " 1b"
#define __BUG_ENTRY_FILE(file)  RISCV_PTR " " file
#endif

#ifdef CONFIG_DEBUG_BUGVERBOSE
#define __BUG_ENTRY(file, line, flags)  \
        __BUG_ENTRY_ADDR "\n\t"         \
        __BUG_ENTRY_FILE(file) "\n\t"   \
        RISCV_SHORT " " line "\n\t"     \
        RISCV_SHORT " " flags
#else
#define __BUG_ENTRY(file, line, flags)          \
        __BUG_ENTRY_ADDR "\n\t"                 \
        RISCV_SHORT " " flags
#endif

#ifdef CONFIG_GENERIC_BUG

#define ARCH_WARN_ASM(file, line, flags, size)                  \
                "1:\n\t"                                        \
                        "ebreak\n"                              \
                        ".pushsection __bug_table,\"aw\"\n\t"   \
                "2:\n\t"                                        \
                __BUG_ENTRY(file, line, flags) "\n\t"           \
                        ".org 2b + " size "\n\t"                \
                        ".popsection"                           \

#define __BUG_FLAGS(cond_str, flags)                            \
do {                                                            \
        __asm__ __volatile__ (                                  \
                ARCH_WARN_ASM("%0", "%1", "%2", "%3")           \
                :                                               \
                : "i" (WARN_CONDITION_STR(cond_str) __FILE__), "i" (__LINE__),  \
                  "i" (flags),                                  \
                  "i" (sizeof(struct bug_entry)));              \
} while (0)

#else /* CONFIG_GENERIC_BUG */
#define __BUG_FLAGS(cond_str, flags) do {                       \
        __asm__ __volatile__ ("ebreak\n");                      \
} while (0)
#endif /* CONFIG_GENERIC_BUG */

#define BUG() do {                                              \
        __BUG_FLAGS("", 0);                                     \
        unreachable();                                          \
} while (0)

#define __WARN_FLAGS(cond_str, flags) __BUG_FLAGS(cond_str, BUGFLAG_WARNING|(flags))

#define ARCH_WARN_REACHABLE

#define HAVE_ARCH_BUG

#include <asm-generic/bug.h>

struct pt_regs;
struct task_struct;

void __show_regs(struct pt_regs *regs);
void die(struct pt_regs *regs, const char *str);
void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr);

#endif /* _ASM_RISCV_BUG_H */