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Difference between revisions of "Talk:Kernel Syscalls"
(Created page with "i dont know if its right, pls correct me if im wrong :) --~~~~") |
(Making sense of what i0nic tweets) |
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i dont know if its right, pls correct me if im wrong :) --[[User:Zmaster|Zmaster]] 13:58, 29 November 2011 (MST) |
i dont know if its right, pls correct me if im wrong :) --[[User:Zmaster|Zmaster]] 13:58, 29 November 2011 (MST) |
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| + | HTTP/i0nic: |
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| + | The following is hardly "bogus". |
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| + | 0x30d2ad54 <chown>: mov r12, #16 ; 0x10, being # of chown |
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| + | 0x30d2ad58 <chown+4>: svc 0x00000080 |
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| + | 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. |
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Revision as of 01:00, 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.
