Andrew Burgess
6abf2eeffa
I was seeing some failures in gdb.threads/omp-par-scope.exp when run on a riscv64 target. It turns out the cause of the problem is that I didn't have debug information installed for libgomp.so, which this test makes use of. The test requires GDB to backtrace through a libgomp function, and the riscv prologue unwinder was failing to unwind this particular stack frame. The reason for the failure to unwind was that the function prologue includes a c.li (compressed load immediate) instruction, and the riscv prologue scanning unwinder doesn't know what to do with this instruction, though the unwinder does understand c.lui (compressed load unsigned immediate). This commit adds support for c.li. After this GDB is able to unwind through libgomp, and I no longer see any unexpected failures in gdb.threads/omp-par-scope.exp. I've also included a new test in gdb.arch/ which specifically checks for our c.li support.
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