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e9c38ceba8
Following (a long time after) a4b5d580e0 ("bug: Make BUG() always stop
the machine"), this adapts the ARM architecture to no longer rely
on the sub-optimal BUG() definition that has a silent endless loop
but instead use the same trapping instruction that we have for
the full BUG() support.
This avoids hundreds of warnings like
arch/arm/include/asm/xen/page.h: In function 'arbitrary_virt_to_machine':
arch/arm/include/asm/xen/page.h:85:1: warning: no return statement in function returning non-void [-Wreturn-type]
and also makes the code size slightly smaller. The behavior changes
from silently stopping the kernel to an oops, and follows what x86
does these days.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
#ifndef _ASMARM_BUG_H
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#define _ASMARM_BUG_H
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#include <linux/linkage.h>
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#include <linux/types.h>
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#include <asm/opcodes.h>
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/*
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* Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
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* We need to be careful not to conflict with those used by other modules and
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* the register_undef_hook() system.
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*/
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#ifdef CONFIG_THUMB2_KERNEL
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#define BUG_INSTR_VALUE 0xde02
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#define BUG_INSTR(__value) __inst_thumb16(__value)
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#else
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#define BUG_INSTR_VALUE 0xe7f001f2
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#define BUG_INSTR(__value) __inst_arm(__value)
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#endif
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#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
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#define _BUG(file, line, value) __BUG(file, line, value)
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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/*
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* The extra indirection is to ensure that the __FILE__ string comes through
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* OK. Many version of gcc do not support the asm %c parameter which would be
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* preferable to this unpleasantness. We use mergeable string sections to
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* avoid multiple copies of the string appearing in the kernel image.
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*/
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#define __BUG(__file, __line, __value) \
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do { \
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asm volatile("1:\t" BUG_INSTR(__value) "\n" \
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".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
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"2:\t.asciz " #__file "\n" \
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".popsection\n" \
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".pushsection __bug_table,\"a\"\n" \
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".align 2\n" \
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"3:\t.word 1b, 2b\n" \
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"\t.hword " #__line ", 0\n" \
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".popsection"); \
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unreachable(); \
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} while (0)
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#else
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#define __BUG(__file, __line, __value) \
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do { \
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asm volatile(BUG_INSTR(__value) "\n"); \
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unreachable(); \
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} while (0)
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#endif /* CONFIG_DEBUG_BUGVERBOSE */
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#define HAVE_ARCH_BUG
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#include <asm-generic/bug.h>
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struct pt_regs;
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void die(const char *msg, struct pt_regs *regs, int err);
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struct siginfo;
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void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
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unsigned long err, unsigned long trap);
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#ifdef CONFIG_ARM_LPAE
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#define FAULT_CODE_ALIGNMENT 33
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#define FAULT_CODE_DEBUG 34
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#else
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#define FAULT_CODE_ALIGNMENT 1
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#define FAULT_CODE_DEBUG 2
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#endif
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void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
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struct pt_regs *),
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int sig, int code, const char *name);
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void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
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struct pt_regs *),
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int sig, int code, const char *name);
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extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
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struct mm_struct;
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extern void show_pte(struct mm_struct *mm, unsigned long addr);
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extern void __show_regs(struct pt_regs *);
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#endif
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