fixup.c File Reference

#include <fixup.h>
#include <Drivers/uart.h>

Include dependency graph for fixup.c:

Macros
#define	USER_LD(dstreg, uptr, faillabel)
#define	USER_ST(srcreg, uptr, faillabel)
#define	USER_MAX   0x0001000000000000

Functions
	__attribute__ ((section(".rdata$exA")))
	__attribute__ ((section(".rdata$exZ")))
uint64_t	__search_fixup_table (uint64_t fault_pc)
	__search_fixup_table – searches alternative address to jump when kernel hits data abort exception
bool	_validate_upointer_range (const void *p, size_t n)
long	__bordoisila_copy_from_user (void *dst, const void *usrc, size_t n)
	__bordoisila_copy_from_user – copy data from user to kernel memory
long	__bordoisila_copy_to_user (void *udst, const void *src, size_t n)
	__bordoisila_copy_to_user – copy to user memory from kernel memory
void	__bordoisila_fixup_table_check ()
	__bordoisila_fixup_table_check – could be called during kernel initialization to check fixup addresses

Macro Definition Documentation

USER_LD

#define USER_LD	(		dstreg,
			uptr,
			faillabel
	)

Value:

    __asm__ volatile goto("1: ldtrb %w0, [%1]\n"                                                   \
                          " .pushsection .rdata$exM,\"a\"\n"                                       \
                          ".align 3\n"                                                             \
                          ".quad 1b, %l[" #faillabel "]\n"                                         \
                          " .popsection\n"                                                         \
                          : "=&r"(dstreg)                                                          \
                          : "r"(uptr)                                                              \
                          : "memory"                                                               \
                          : faillabel)

USER_MAX

#define USER_MAX   0x0001000000000000

USER_ST

#define USER_ST	(		srcreg,
			uptr,
			faillabel
	)

Value:

    __asm__ volatile goto("1: sttrb %w0, [%1]\n"                                                   \
                          ".pushsection .rdata$exM,\"a\"\n"                                        \
                          ".align 3\n"                                                             \
                          ".quad 1b, %l[" #faillabel "]\n"                                         \
                          ".popsection\n" ::"r"(srcreg),                                           \
                          "r"(uptr)                                                                \
                          : "memory"                                                               \
                          : faillabel)

Function Documentation

__attribute__() [1/2]

__attribute__

(

(section(".rdata$exA"))

)

__attribute__() [2/2]

__attribute__

(

(section(".rdata$exZ"))

)

__bordoisila_copy_from_user()

long __bordoisila_copy_from_user	(	void *	dst,
		const void *	usrc,
		size_t	n
	)

__bordoisila_copy_from_user – copy data from user to kernel memory

Parameters

dst	– destination kernel memory
usrc	– user source memory
n	– number of bytes to copy

__bordoisila_copy_to_user()

long __bordoisila_copy_to_user	(	void *	udst,
		const void *	src,
		size_t	n
	)

__bordoisila_copy_to_user – copy to user memory from kernel memory

Parameters

udst	– user space destination memory
src	– kernel source memory
n	– number of bytes to copy

__bordoisila_fixup_table_check()

void __bordoisila_fixup_table_check

(

)

__bordoisila_fixup_table_check – could be called during kernel initialization to check fixup addresses

__search_fixup_table()

uint64_t __search_fixup_table

(

uint64_t

fault_pc

)

__search_fixup_table – searches alternative address to jump when kernel hits data abort exception

Parameters

fault_pc

– faulting instruction pointer

_validate_upointer_range()

bool _validate_upointer_range	(	const void *	p,
		size_t	n
	)