mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
43f003bb74
BUG(), WARN() and friends are using a similar inline assembly to implement various traps with various flags. Lets refactor via a new BUG_ENTRY() macro. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c19a82b37677ace0eebb0dc8c2120373c29c8dd1.1566219503.git.christophe.leroy@c-s.fr
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_BUG_H
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#define _ASM_POWERPC_BUG_H
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#ifdef __KERNEL__
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#include <asm/asm-compat.h>
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#ifdef CONFIG_BUG
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#ifdef __ASSEMBLY__
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#include <asm/asm-offsets.h>
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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.macro EMIT_BUG_ENTRY addr,file,line,flags
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.section __bug_table,"aw"
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5001: PPC_LONG \addr, 5002f
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.short \line, \flags
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.org 5001b+BUG_ENTRY_SIZE
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.previous
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.section .rodata,"a"
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5002: .asciz "\file"
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.previous
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.endm
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#else
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.macro EMIT_BUG_ENTRY addr,file,line,flags
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.section __bug_table,"aw"
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5001: PPC_LONG \addr
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.short \flags
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.org 5001b+BUG_ENTRY_SIZE
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.previous
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.endm
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#endif /* verbose */
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#else /* !__ASSEMBLY__ */
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/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
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sizeof(struct bug_entry), respectively */
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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#define _EMIT_BUG_ENTRY \
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".section __bug_table,\"aw\"\n" \
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"2:\t" PPC_LONG "1b, %0\n" \
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"\t.short %1, %2\n" \
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".org 2b+%3\n" \
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".previous\n"
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#else
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#define _EMIT_BUG_ENTRY \
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".section __bug_table,\"aw\"\n" \
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"2:\t" PPC_LONG "1b\n" \
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"\t.short %2\n" \
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".org 2b+%3\n" \
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".previous\n"
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#endif
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#define BUG_ENTRY(insn, flags, ...) \
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__asm__ __volatile__( \
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"1: " insn "\n" \
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_EMIT_BUG_ENTRY \
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: : "i" (__FILE__), "i" (__LINE__), \
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"i" (flags), \
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"i" (sizeof(struct bug_entry)), \
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##__VA_ARGS__)
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/*
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* BUG_ON() and WARN_ON() do their best to cooperate with compile-time
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* optimisations. However depending on the complexity of the condition
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* some compiler versions may not produce optimal results.
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*/
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#define BUG() do { \
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BUG_ENTRY("twi 31, 0, 0", 0); \
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unreachable(); \
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} while (0)
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#define BUG_ON(x) do { \
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if (__builtin_constant_p(x)) { \
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if (x) \
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BUG(); \
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} else { \
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BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \
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} \
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} while (0)
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#define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
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#define WARN_ON(x) ({ \
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int __ret_warn_on = !!(x); \
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if (__builtin_constant_p(__ret_warn_on)) { \
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if (__ret_warn_on) \
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__WARN(); \
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} else { \
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BUG_ENTRY(PPC_TLNEI " %4, 0", \
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BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
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"r" (__ret_warn_on)); \
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} \
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unlikely(__ret_warn_on); \
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})
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#define HAVE_ARCH_BUG
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#define HAVE_ARCH_BUG_ON
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#define HAVE_ARCH_WARN_ON
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#endif /* __ASSEMBLY __ */
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#else
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#ifdef __ASSEMBLY__
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.macro EMIT_BUG_ENTRY addr,file,line,flags
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.endm
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#else /* !__ASSEMBLY__ */
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#define _EMIT_BUG_ENTRY
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#endif
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#endif /* CONFIG_BUG */
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#include <asm-generic/bug.h>
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#ifndef __ASSEMBLY__
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struct pt_regs;
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extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
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extern void bad_page_fault(struct pt_regs *, unsigned long, int);
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extern void _exception(int, struct pt_regs *, int, unsigned long);
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extern void _exception_pkey(struct pt_regs *, unsigned long, int);
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extern void die(const char *, struct pt_regs *, long);
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extern bool die_will_crash(void);
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extern void panic_flush_kmsg_start(void);
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extern void panic_flush_kmsg_end(void);
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_BUG_H */
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