https://bugs.kde.org/show_bug.cgi?id=379473
Bug ID: 379473
Summary: MIPS: add support for rdhwr cycle counter register
Product: valgrind
Version: 3.12.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: wishlist
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: james...@cowgill.org.uk
Target Milestone: ---
Running valgrind on an executable (n64 little endian) linked against openblas
gives:
vex mips->IR: unhandled instruction bytes: 0x3B 0x10 0x10 0x7C
==9377== valgrind: Unrecognised instruction at address 0x4aa6dd8.
==9377== at 0x4AA6DD8: ??? (in /usr/lib/libopenblas_mipsp-r0.2.19.so)
==9377== by 0x4AA6D98: ??? (in /usr/lib/libopenblas_mipsp-r0.2.19.so)
==9377== Your program just tried to execute an instruction that Valgrind
==9377== did not recognise. There are two possible reasons for this.
==9377== 1. Your program has a bug and erroneously jumped to a non-code
==9377== location. If you are running Memcheck and you just saw a
==9377== warning about a bad jump, it's probably your program's fault.
==9377== 2. The instruction is legitimate but Valgrind doesn't handle it,
==9377== i.e. it's Valgrind's fault. If you think this is the case or
==9377== you are not sure, please let us know and we'll try to fix it.
==9377== Either way, Valgrind will now raise a SIGILL signal which will
==9377== probably kill your program.
==9377==
==9377== Process terminating with default action of signal 4 (SIGILL): dumping
core
==9377== Illegal opcode at address 0x4AA6DD8
==9377== at 0x4AA6DD8: ??? (in /usr/lib/libopenblas_mipsp-r0.2.19.so)
==9377== by 0x4AA6D98: ??? (in /usr/lib/libopenblas_mipsp-r0.2.19.so)
This instruction is:
1bedd8: 7c10103b rdhwr s0,hwr_cc
I see from the sources there is no support for reading the cycle counter using
rdhwr (rd == 2). Given that there is already support for reading the Cavium
specific count register, it would seem logical to add support for reading the
generic MIPS one.
I expect you want to implement reading the ccres register to go with this (rd
== 3). The ISA manual states that all R2 processors support these registers.
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