WIP: BPF support for ARCv2 and ARCv3 #85
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Define appropriate uapi for the BPF_PROG_TYPE_PERF_EVENT program type by exporting the user_regs_struct structure instead of the pt_regs structure that is in-kernel only. Signed-off-by: Sergey Matyukevich <[email protected]>
Add PT_REGS macros suitable for ARCompact and ARCv2. Signed-off-by: Vladimir Isaev <[email protected]>
added 7 commits
April 12, 2022 20:36
Enable HAVE_REGS_AND_STACK_ACCESS_API feature for ARC architecture, including ARCcompact and ARCv2 flavors. Add supporting functions and defines. Signed-off-by: Sergey Matyukevich <[email protected]>
Function syscall_trace_exit expects pointer to pt_regs. However r0 is also used to keep syscall return value. Restore pointer to pt_regs before calling syscall_trace_exit. Signed-off-by: Sergey Matyukevich <[email protected]>
Implement all the bits required to support HAVE_SYSCALL_TRACEPOINTS according to Documentation/trace/ftrace-design.rst. Signed-off-by: Sergey Matyukevich <[email protected]>
Layout of pt_regs structure differs between ARCompact/ARCv2/ARCv3. Fix set_reg/get_reg functions to handle proper registers. Signed-off-by: Sergey Matyukevich <[email protected]>
All the supporting functions and defines are the same for all three ARC architecture flavors. Define missing regoffset_table for ARCv3. Signed-off-by: Sergey Matyukevich <[email protected]>
Signed-off-by: Sergey Matyukevich <[email protected]>
Fix typo in genregs_get that makes it store field address instead of its value. Signed-off-by: Sergey Matyukevich <[email protected]>
Properly handle kgdb and kprobes addresses in kernel translated memory. Update address check: throw bugs for user mappings and inconsistent vmalloc areas. Signed-off-by: Sergey Matyukevich <[email protected]>
ARC toolchains generate 'complex float' DIE entries in libgcc. At the moment such entries are not yet handled by pahole. So for now disable BTF floats. Signed-off-by: Vladimir Isaev <[email protected]>
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This PR enables a couple of features required for better BPF support on ARCompact/ARCv2/ARCv3 architectures:
Known issues with BTF generation:
With quick workaround applied BTF can be generated. So far the following examples from libbpf-tools have been tried: biopattern, softirqs, vfsstat, filetop, ksnoop, tcpconnect, execsnoop, exitsnoop, mountsnoop, opensnoop, statsnoop, syscount.