Re: L4_SYSCALL_INVOKE is a negat ive PC value？
Adam Lackorzynski <[email protected]>
| Newsgroups | gmane.comp.micro-kernel.l4.devel |
|---|---|
| Message-ID | <[email protected]> |
On Sun Sep 28, 2014 at 03:26:53 +0000, Zachary wrote: > Thank you, Adam. Based on your reply, I have another question. > > As the macro defined in L4Re source code, the branch adress is: > L4_SYSCALL_INVOKE 0xFFFFFFF4 > L4_SYSCALL_MEM_OP 0xFFFFFFF0 > > This means the "L4_SYSCALL_INVOKE" is at the higher address. > > And in asm_entry.h, the syscall table is: > .macro GEN_SYSCALL_TABLE > .align 4 > .global sys_call_table > sys_call_table: > ... > .word sys_kdb_ke > .word sys_ipc_wrapper > .word sys_arm_mem_op > ... > .endm > > On the contrary, this table tells me that the "sys_ipc_wrapper" is at the > lower address, so, why this happens? The offsets into the table are just calculated so that it works. Please see the usage sites of sys_call_table in the same file. Adam -- Adam [email protected] Lackorzynski http://os.inf.tu-dresden.de/~adam/