18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci#ifndef _ASMARM_BUG_H 38c2ecf20Sopenharmony_ci#define _ASMARM_BUG_H 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ci#include <linux/linkage.h> 68c2ecf20Sopenharmony_ci#include <linux/types.h> 78c2ecf20Sopenharmony_ci#include <asm/opcodes.h> 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci/* 108c2ecf20Sopenharmony_ci * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling. 118c2ecf20Sopenharmony_ci * We need to be careful not to conflict with those used by other modules and 128c2ecf20Sopenharmony_ci * the register_undef_hook() system. 138c2ecf20Sopenharmony_ci */ 148c2ecf20Sopenharmony_ci#ifdef CONFIG_THUMB2_KERNEL 158c2ecf20Sopenharmony_ci#define BUG_INSTR_VALUE 0xde02 168c2ecf20Sopenharmony_ci#define BUG_INSTR(__value) __inst_thumb16(__value) 178c2ecf20Sopenharmony_ci#else 188c2ecf20Sopenharmony_ci#define BUG_INSTR_VALUE 0xe7f001f2 198c2ecf20Sopenharmony_ci#define BUG_INSTR(__value) __inst_arm(__value) 208c2ecf20Sopenharmony_ci#endif 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE) 248c2ecf20Sopenharmony_ci#define _BUG(file, line, value) __BUG(file, line, value) 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci#ifdef CONFIG_DEBUG_BUGVERBOSE 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ci/* 298c2ecf20Sopenharmony_ci * The extra indirection is to ensure that the __FILE__ string comes through 308c2ecf20Sopenharmony_ci * OK. Many version of gcc do not support the asm %c parameter which would be 318c2ecf20Sopenharmony_ci * preferable to this unpleasantness. We use mergeable string sections to 328c2ecf20Sopenharmony_ci * avoid multiple copies of the string appearing in the kernel image. 338c2ecf20Sopenharmony_ci */ 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci#define __BUG(__file, __line, __value) \ 368c2ecf20Sopenharmony_cido { \ 378c2ecf20Sopenharmony_ci asm volatile("1:\t" BUG_INSTR(__value) "\n" \ 388c2ecf20Sopenharmony_ci ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \ 398c2ecf20Sopenharmony_ci "2:\t.asciz " #__file "\n" \ 408c2ecf20Sopenharmony_ci ".popsection\n" \ 418c2ecf20Sopenharmony_ci ".pushsection __bug_table,\"aw\"\n" \ 428c2ecf20Sopenharmony_ci ".align 2\n" \ 438c2ecf20Sopenharmony_ci "3:\t.word 1b, 2b\n" \ 448c2ecf20Sopenharmony_ci "\t.hword " #__line ", 0\n" \ 458c2ecf20Sopenharmony_ci ".popsection"); \ 468c2ecf20Sopenharmony_ci unreachable(); \ 478c2ecf20Sopenharmony_ci} while (0) 488c2ecf20Sopenharmony_ci 498c2ecf20Sopenharmony_ci#else 508c2ecf20Sopenharmony_ci 518c2ecf20Sopenharmony_ci#define __BUG(__file, __line, __value) \ 528c2ecf20Sopenharmony_cido { \ 538c2ecf20Sopenharmony_ci asm volatile(BUG_INSTR(__value) "\n"); \ 548c2ecf20Sopenharmony_ci unreachable(); \ 558c2ecf20Sopenharmony_ci} while (0) 568c2ecf20Sopenharmony_ci#endif /* CONFIG_DEBUG_BUGVERBOSE */ 578c2ecf20Sopenharmony_ci 588c2ecf20Sopenharmony_ci#define HAVE_ARCH_BUG 598c2ecf20Sopenharmony_ci 608c2ecf20Sopenharmony_ci#include <asm-generic/bug.h> 618c2ecf20Sopenharmony_ci 628c2ecf20Sopenharmony_cistruct pt_regs; 638c2ecf20Sopenharmony_civoid die(const char *msg, struct pt_regs *regs, int err); 648c2ecf20Sopenharmony_ci 658c2ecf20Sopenharmony_civoid arm_notify_die(const char *str, struct pt_regs *regs, 668c2ecf20Sopenharmony_ci int signo, int si_code, void __user *addr, 678c2ecf20Sopenharmony_ci unsigned long err, unsigned long trap); 688c2ecf20Sopenharmony_ci 698c2ecf20Sopenharmony_ci#ifdef CONFIG_ARM_LPAE 708c2ecf20Sopenharmony_ci#define FAULT_CODE_ALIGNMENT 33 718c2ecf20Sopenharmony_ci#define FAULT_CODE_DEBUG 34 728c2ecf20Sopenharmony_ci#else 738c2ecf20Sopenharmony_ci#define FAULT_CODE_ALIGNMENT 1 748c2ecf20Sopenharmony_ci#define FAULT_CODE_DEBUG 2 758c2ecf20Sopenharmony_ci#endif 768c2ecf20Sopenharmony_ci 778c2ecf20Sopenharmony_civoid hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, 788c2ecf20Sopenharmony_ci struct pt_regs *), 798c2ecf20Sopenharmony_ci int sig, int code, const char *name); 808c2ecf20Sopenharmony_ci 818c2ecf20Sopenharmony_civoid hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, 828c2ecf20Sopenharmony_ci struct pt_regs *), 838c2ecf20Sopenharmony_ci int sig, int code, const char *name); 848c2ecf20Sopenharmony_ci 858c2ecf20Sopenharmony_ciextern asmlinkage void c_backtrace(unsigned long fp, int pmode, 868c2ecf20Sopenharmony_ci const char *loglvl); 878c2ecf20Sopenharmony_ci 888c2ecf20Sopenharmony_cistruct mm_struct; 898c2ecf20Sopenharmony_civoid show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr); 908c2ecf20Sopenharmony_ciextern void __show_regs(struct pt_regs *); 918c2ecf20Sopenharmony_ci 928c2ecf20Sopenharmony_ci#endif 93