hello everyone,
In cache.h file(..\l4\pkg\l4sys\include\ARCH-arm\cache.h), a piece of code
is as follows：
l4_cache_op_arm_call(unsigned long op,
unsigned long start,
unsigned long end)
{
...
__asm__ __volatile__
("@ l4_cache_op_arm_call(start) \n\t"
"mov lr, pc \n\t"
"mov pc, %[sc] \n\t"
"@ l4_cache_op_arm_call(end) \n\t"
:
"=r" (_op),
"=r" (_start),
"=r" (_end)
:
[sc] "i" (L4_SYSCALL_MEM_OP),
"0" (_op),
"1" (_start),
"2" (_end)
:
"cc", "memory", "lr"
);
}
My question is whether the code means that PC jumps to the address of
L4_SYSCALL_MEM_OP(actual value is -0x00000010)? If it is true, then it means
the address is 0xFFFFFFF0 ?
My second question is whether the address 0xFFFFFFF0 corresponds to the
sys_arm_mem_op in the following definition?
(..\kernel\fiasco\src\kern\arm\asm_entry.h)
/*********************************************************************/
/* The syscall table stuff */
/*********************************************************************/
.macro GEN_SYSCALL_TABLE
.align 4
.global sys_call_table
sys_call_table:
.word sys_kdb_ke
.word sys_kdb_ke
.word sys_ipc_wrapper
.word sys_arm_mem_op
.word sys_invoke_debug_wrapper
.word sys_kdb_ke
.word sys_kdb_ke
.word sys_kdb_ke
.word sys_kdb_ke
.word sys_kdb_ke
.word sys_kdb_ke
.endm
Thank you so much.
Best,
Zachary
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