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Fix test_bpf_syscall_macro selftest on powerpc #8010

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Fix test_bpf_syscall_macro selftest on powerpc #8010

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Commits on Nov 4, 2024

  1. libbpf: Fix accessing the syscall argument on powerpc 

    Since commit 7e92e01 ("powerpc: Provide syscall wrapper"), powerpc
selects ARCH_HAS_SYSCALL_WRAPPER so let's use the generic implementation
of PT_REGS_SYSCALL_REGS().

Also, allow overriding PT_REGS_PARM1{_CORE}_SYSCALL for powerpc as
powerpc needs orig_gpr3, similar to s390 and arm64.

Signed-off-by: Saket Kumar Bhaskar <[email protected]>
    Saket Kumar Bhaskar authored and Kernel Patches Daemon committed Nov 4, 2024
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  2. libbpf: Remove powerpc prefix from syscall function names 

    Since commit 9474689 ("powerpc: Don't add __powerpc_ prefix to
syscall entry points") drops _powerpc prefix to syscall entry points,
even though powerpc now supports syscall wrapper, so /proc/kallsyms
have symbols for syscall entry without powerpc prefix(sys_*).

For this reason, arch specific prefix for syscall functions in powerpc
is dropped.

Signed-off-by: Saket Kumar Bhaskar <[email protected]>
    Saket Kumar Bhaskar authored and Kernel Patches Daemon committed Nov 4, 2024
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  3. selftests/bpf: Define SYS_PREFIX for powerpc 

    SYS_PREFIX was missing for a powerpc, which made a kprobe test to
sys_prctl fail.

Add missing SYS_PREFIX for powerpc.

Fixes: 7e92e01 ("powerpc: Provide syscall wrapper")
Fixes: 9474689 ("powerpc: Don't add __powerpc_ prefix to syscall entry points")
Signed-off-by: Saket Kumar Bhaskar <[email protected]>
    Saket Kumar Bhaskar authored and Kernel Patches Daemon committed Nov 4, 2024
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