extable.h File Reference

Exception table support. More...

#include <xtf/types.h>
#include <xtf/asm_macros.h>
#include <xtf/macro_magic.h>
#include <arch/extable.h>

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Data Structures
struct	extable_entry
	Exception table entry. More...

Macros
#define	_ASM_EXTABLE_HANDLER(fault, fixup, handler)
	Create an exception table entry with custom handler. More...
#define	_ASM_EXTABLE(fault, fixup)   _ASM_EXTABLE_HANDLER(fault, fixup, 0)
	Create an exception table entry. More...
#define	_ASM_TRAP_OK(loc)   _ASM_EXTABLE(loc, loc)
	Create an exception table entry, whitelisting a trap as being ok at loc. More...

Functions
void	sort_extable (void)
	Sort the exception table. More...
const struct extable_entry *	search_extable (unsigned long addr)
	Search the exception table to find the entry associated with a specific faulting address. More...

Detailed Description

Exception table support.

Allows code to tag an instruction which might fault, and where to jump to in order to recover. For more complicated recovery, a custom handler can be registered.

Definition in file extable.h.

Macro Definition Documentation

_ASM_EXTABLE_HANDLER

#define _ASM_EXTABLE_HANDLER	(		fault,
			fixup,
			handler
	)

Value:

".pushsection .ex_table, \"a\";\n"                          \
    _WORD STR(fault) ", " STR(fixup) ", " STR(handler) ";\n"    \
    ".popsection;\n"

Create an exception table entry with custom handler.

Parameters

fault	Faulting address.
fixup	Fixup address.
handler	Handler to call.

Definition at line 38 of file extable.h.

_ASM_EXTABLE

#define _ASM_EXTABLE	(		fault,
			fixup
	)		_ASM_EXTABLE_HANDLER(fault, fixup, 0)

Create an exception table entry.

Parameters

fault	Faulting address.
fixup	Fixup address.

Definition at line 50 of file extable.h.

_ASM_TRAP_OK

#define _ASM_TRAP_OK

(

loc

)

_ASM_EXTABLE(loc, loc)

Create an exception table entry, whitelisting a trap as being ok at loc.

(ab)uses the fault fixup logic to fixup to its current position.

Parameters

loc	Location of the trap.

Definition at line 57 of file extable.h.

Function Documentation

sort_extable()

void sort_extable

(

void

)

Sort the exception table.

Required to be called once on boot to make searching efficient.

Definition at line 52 of file extable.c.

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search_extable()

const struct extable_entry* search_extable

(

unsigned long

addr

)

Search the exception table to find the entry associated with a specific faulting address.

Parameters

addr	Faulting address.

Returns

Appropriate extable_entry, or NULL if no entry.

Definition at line 11 of file extable.c.

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