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| 280 | It has the most advanced debugging features we have ever seen. To highlight some, its |
280 | It has the most advanced debugging features we have ever seen. To highlight some, its |
| 281 | memory access tracing ability has been really helpfull to us. During device driver |
281 | memory access tracing ability has been really helpfull to us. During device driver |
| 282 | development, we appreciated the possibility to turn logging of the devices to a specified |
282 | development, we appreciated the possibility to turn logging of the devices to a specified |
| 283 | verbosity. |
283 | verbosity. |
| 284 | 284 | ||
| 285 | We used it to test and develop amd64 and ia32 architectures in SMP mode and mips32 architecture in UP mode. |
285 | We used it to test and develop amd64 and ia32 architectures in SMP mode and mips32 architecture in UP mode. Simics emulates the 4Kc processor on the MIPS architecture. |
| - | 286 | Unfortunately, this processor does not have an exception Reserved Instruction, which |
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| - | 287 | makes it unusable in an environment with programs using thread local storage. |
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| 286 | 288 | ||
| 287 | Regardless of its invaluable qualities, it has still contained bugs. One of the most |
289 | Regardless of its invaluable qualities, it has still contained bugs. One of the most |
| 288 | serious was bug with ticket \#3351. {\OP} discovered that its BIOS rewrites kernel memory |
290 | serious was bug with ticket \#3351. {\OP} discovered that its BIOS rewrites kernel memory |
| 289 | during application processors start. Another bugs found were related to amd64 and mips32. |
291 | during application processors start. Another bugs found were related to amd64 and mips32. |
| 290 | As for amd64, Simics did not report general protection fault when {\tt EFER.NXE} was 0 and a non-executable |
292 | As for amd64, Simics did not report general protection fault when {\tt EFER.NXE} was 0 and a non-executable |