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Diffstat (limited to 'arch/powerpc/include/asm/bug.h')
| -rw-r--r-- | arch/powerpc/include/asm/bug.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h new file mode 100644 index 000000000..61a473635 --- /dev/null +++ b/arch/powerpc/include/asm/bug.h @@ -0,0 +1,175 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_BUG_H +#define _ASM_POWERPC_BUG_H +#ifdef __KERNEL__ + +#include <asm/asm-compat.h> +#include <asm/extable.h> + +#ifdef CONFIG_BUG + +#ifdef __ASSEMBLY__ +#include <asm/asm-offsets.h> +#ifdef CONFIG_DEBUG_BUGVERBOSE +.macro __EMIT_BUG_ENTRY addr,file,line,flags + .section __bug_table,"aw" +5001: .4byte \addr - . + .4byte 5002f - . + .short \line, \flags + .org 5001b+BUG_ENTRY_SIZE + .previous + .section .rodata,"a" +5002: .asciz "\file" + .previous +.endm +#else +.macro __EMIT_BUG_ENTRY addr,file,line,flags + .section __bug_table,"aw" +5001: .4byte \addr - . + .short \flags + .org 5001b+BUG_ENTRY_SIZE + .previous +.endm +#endif /* verbose */ + +.macro EMIT_WARN_ENTRY addr,file,line,flags + EX_TABLE(\addr,\addr+4) + __EMIT_BUG_ENTRY \addr,\file,\line,\flags +.endm + +.macro EMIT_BUG_ENTRY addr,file,line,flags + .if \flags & 1 /* BUGFLAG_WARNING */ + .err /* Use EMIT_WARN_ENTRY for warnings */ + .endif + __EMIT_BUG_ENTRY \addr,\file,\line,\flags +.endm + +#else /* !__ASSEMBLY__ */ +/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and + sizeof(struct bug_entry), respectively */ +#ifdef CONFIG_DEBUG_BUGVERBOSE +#define _EMIT_BUG_ENTRY \ + ".section __bug_table,\"aw\"\n" \ + "2: .4byte 1b - .\n" \ + " .4byte %0 - .\n" \ + " .short %1, %2\n" \ + ".org 2b+%3\n" \ + ".previous\n" +#else +#define _EMIT_BUG_ENTRY \ + ".section __bug_table,\"aw\"\n" \ + "2: .4byte 1b - .\n" \ + " .short %2\n" \ + ".org 2b+%3\n" \ + ".previous\n" +#endif + +#define BUG_ENTRY(insn, flags, ...) \ + __asm__ __volatile__( \ + "1: " insn "\n" \ + _EMIT_BUG_ENTRY \ + : : "i" (__FILE__), "i" (__LINE__), \ + "i" (flags), \ + "i" (sizeof(struct bug_entry)), \ + ##__VA_ARGS__) + +#define WARN_ENTRY(insn, flags, label, ...) \ + asm_volatile_goto( \ + "1: " insn "\n" \ + EX_TABLE(1b, %l[label]) \ + _EMIT_BUG_ENTRY \ + : : "i" (__FILE__), "i" (__LINE__), \ + "i" (flags), \ + "i" (sizeof(struct bug_entry)), \ + ##__VA_ARGS__ : : label) + +/* + * BUG_ON() and WARN_ON() do their best to cooperate with compile-time + * optimisations. However depending on the complexity of the condition + * some compiler versions may not produce optimal results. + */ + +#define BUG() do { \ + BUG_ENTRY("twi 31, 0, 0", 0); \ + unreachable(); \ +} while (0) +#define HAVE_ARCH_BUG + +#define __WARN_FLAGS(flags) do { \ + __label__ __label_warn_on; \ + \ + WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \ + unreachable(); \ + \ +__label_warn_on: \ + break; \ +} while (0) + +#ifdef CONFIG_PPC64 +#define BUG_ON(x) do { \ + if (__builtin_constant_p(x)) { \ + if (x) \ + BUG(); \ + } else { \ + BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \ + } \ +} while (0) + +#define WARN_ON(x) ({ \ + bool __ret_warn_on = false; \ + do { \ + if (__builtin_constant_p((x))) { \ + if (!(x)) \ + break; \ + __WARN(); \ + __ret_warn_on = true; \ + } else { \ + __label__ __label_warn_on; \ + \ + WARN_ENTRY(PPC_TLNEI " %4, 0", \ + BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ + __label_warn_on, \ + "r" ((__force long)(x))); \ + break; \ +__label_warn_on: \ + __ret_warn_on = true; \ + } \ + } while (0); \ + unlikely(__ret_warn_on); \ +}) + +#define HAVE_ARCH_BUG_ON +#define HAVE_ARCH_WARN_ON +#endif + +#endif /* __ASSEMBLY __ */ +#else +#ifdef __ASSEMBLY__ +.macro EMIT_BUG_ENTRY addr,file,line,flags +.endm +.macro EMIT_WARN_ENTRY addr,file,line,flags +.endm +#else /* !__ASSEMBLY__ */ +#define _EMIT_BUG_ENTRY +#define _EMIT_WARN_ENTRY +#endif +#endif /* CONFIG_BUG */ + +#include <asm-generic/bug.h> + +#ifndef __ASSEMBLY__ + +struct pt_regs; +void hash__do_page_fault(struct pt_regs *); +void bad_page_fault(struct pt_regs *, int); +extern void _exception(int, struct pt_regs *, int, unsigned long); +extern void _exception_pkey(struct pt_regs *, unsigned long, int); +extern void die(const char *, struct pt_regs *, long); +void die_mce(const char *str, struct pt_regs *regs, long err); +extern bool die_will_crash(void); +extern void panic_flush_kmsg_start(void); +extern void panic_flush_kmsg_end(void); +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ +#endif /* _ASM_POWERPC_BUG_H */ |