2015-10-23 19:21:55 +00:00
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#ifndef __ASM_X8664_BUG_H
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#define __ASM_X8664_BUG_H 1
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2015-10-23 19:48:45 +00:00
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#if defined(__VMKLNX__)
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/*
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* For vmklinux, the trick below doesn't work. It works by raising a
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* ud2 exception, and then the exception handler knows the rip is
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* pointing to a struct bug_frame. However, pushq can only have a
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* 32-bit immediate, so we can't push the 64-address of __FILE__ into
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* it (this works on linux, because linux is loaded at -2Gb, and when
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* 'signed int filename' is cast to long it is sign-extended, the top
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* bits filled to 0xffff... and the address is correct. Besides this,
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* the vmkernel ud2 exception handler doesn't know anything about
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* this. So the long and the short of it is - we don't do any of this
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* arch specific BUG() stuff, and just fall back to the generic
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* panic()
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*/
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#include <asm-generic/bug.h>
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#else /* !defined(__VMKLNX__) */
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2015-10-23 19:21:55 +00:00
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#include <linux/stringify.h>
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/*
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* Tell the user there is some problem. The exception handler decodes
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* this frame.
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*/
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struct bug_frame {
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unsigned char ud2[2];
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unsigned char push;
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signed int filename;
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unsigned char ret;
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unsigned short line;
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} __attribute__((packed));
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#ifdef CONFIG_BUG
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#define HAVE_ARCH_BUG
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/* We turn the bug frame into valid instructions to not confuse
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the disassembler. Thanks to Jan Beulich & Suresh Siddha
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for nice instruction selection.
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The magic numbers generate mov $64bitimm,%eax ; ret $offset. */
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2015-10-23 19:48:45 +00:00
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2015-10-23 19:21:55 +00:00
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#define BUG() \
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asm volatile( \
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"ud2 ; pushq $%c1 ; ret $%c0" :: \
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"i"(__LINE__), "i" (__FILE__))
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void out_of_line_bug(void);
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#else
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static inline void out_of_line_bug(void) { }
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#endif
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#include <asm-generic/bug.h>
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#endif
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2015-10-23 19:48:45 +00:00
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#endif /* defined(__VMKLNX __) */
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