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Difference between revisions of "Talk:Kernel Syscalls"
(Making sense of what i0nic tweets) |
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is a direct disassembly of libSystem. You can see that with gdb on a jb device. |
is a direct disassembly of libSystem. You can see that with gdb on a jb device. |
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| − | SVC is an ARM instruction to invoke a "supervisor call". The 0x80 is the call #, because the chip allows an interrupt vector, much like Intel's INT instruction. Then, you place the syscall # (in the above example, chown) in r12. |
+ | SVC is an ARM instruction to invoke a "supervisor call". The 0x80 is the call #, because the chip allows an interrupt vector, much like Intel's INT instruction. Then, you place the syscall # (in the above example, chown) in r12. [[User:morpheus|morpheus||3/1/2012, 20:01 EST. |
Revision as of 01:01, 2 March 2012
i dont know if its right, pls correct me if im wrong :) --Zmaster 13:58, 29 November 2011 (MST)
HTTP/i0nic: The following is hardly "bogus". 0x30d2ad54 <chown>: mov r12, #16 ; 0x10, being # of chown 0x30d2ad58 <chown+4>: svc 0x00000080 is a direct disassembly of libSystem. You can see that with gdb on a jb device.
SVC is an ARM instruction to invoke a "supervisor call". The 0x80 is the call #, because the chip allows an interrupt vector, much like Intel's INT instruction. Then, you place the syscall # (in the above example, chown) in r12. [[User:morpheus|morpheus||3/1/2012, 20:01 EST.
