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View Code? Open in Web Editor NEWReverse engineering Rosetta 2 on M1 Mac
Home Page: https://ffri.github.io/ProjectChampollion/
License: Apache License 2.0
Reverse engineering Rosetta 2 on M1 Mac
Home Page: https://ffri.github.io/ProjectChampollion/
License: Apache License 2.0
When we follow https://ffri.github.io/ProjectChampollion/appendix/ to debug at arm64 instruction-level debug, there are many strange issues, such as:
lisa@jjl bt % lldb -- ./runner ./float
(lldb) target create "./runner"
Current executable set to '/Users/lisa/bt/runner' (arm64).
(lldb) settings set -- target.run-args "./float"
(lldb) r
Process 9182 launched: '/Users/lisa/bt/runner' (arm64)
Process 9182 stopped
* thread #2, stop reason = exec
frame #0: 0x00007ffdfffbc3ec runtime`_mh_execute_header + 17388
runtime`_mh_execute_header:
-> 0x7ffdfffbc3ec <+17388>: mov x19, sp
0x7ffdfffbc3f0 <+17392>: and sp, x19, #0xfffffffffffffff0
0x7ffdfffbc3f4 <+17396>: mov x29, sp
0x7ffdfffbc3f8 <+17400>: ldr x20, [x19, #0x20]
Target 0: (runtime) stopped.
(lldb) watchpoint set expression 0x7ffdfffbc3f0 ====> set a watchpoint that won't hit
Watchpoint created: Watchpoint 1: addr = 0x7ffdfffbc3f0 size = 8 state = enabled ...
new value: -7998388550590730625
(lldb) c
Process 9182 resuming
rosetta error: failed to allocate vm space for aot =========> will cause such failure
Process 9182 stopped
* thread #2, stop reason = signal SIGTRAP
frame #0: 0x00007ffdfffd4d38 runtime`_mh_execute_header + 118072
runtime`_mh_execute_header:
-> 0x7ffdfffd4d38 <+118072>: brk #0x1
0x7ffdfffd4d3c <+118076>: stp x20, x19, [sp, #-0x20]!
0x7ffdfffd4d40 <+118080>: stp x29, x30, [sp, #0x10]
0x7ffdfffd4d44 <+118084>: add x29, sp, #0x10 ; =0x10
Target 0: (runtime) stopped.
(lldb)
isa@jjl bt % lldb -- ./runner ./lazy ===> lazy has a dead loop in main()
(lldb) target create "./runner"
Current executable set to '/Users/lisa/bt/runner' (arm64).
(lldb) settings set -- target.run-args "./lazy"
(lldb) r
Process 9235 launched: '/Users/lisa/bt/runner' (arm64)
Process 9235 stopped
* thread #2, stop reason = exec
frame #0: 0x00007ffdfffbc3ec runtime`_mh_execute_header + 17388
runtime`_mh_execute_header:
-> 0x7ffdfffbc3ec <+17388>: mov x19, sp
0x7ffdfffbc3f0 <+17392>: and sp, x19, #0xfffffffffffffff0
0x7ffdfffbc3f4 <+17396>: mov x29, sp
0x7ffdfffbc3f8 <+17400>: ldr x20, [x19, #0x20]
Target 0: (runtime) stopped.
(lldb) c
Process 9235 resuming
Process 9235 stopped ====> type ctrl+c to stop in the main function of lazy
* thread #2, stop reason = signal SIGSTOP
frame #0: 0x0000000100011018
-> 0x100011018: ldur w0, [x5, #-0x8]
0x10001101c: cmp w0, #0x0 ; =0x0
0x100011020: b.eq 0x100011028
0x100011024: b 0x100011018
Target 0: (runtime) stopped.
(lldb) si ========> stuck here
and so on.
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