libbpf now has macros to access syscall arguments in an architecture-agnostic manner, but unfortunately they have a number of issues on non-Intel arches, which this series aims to fix. v1: https://lore.kernel.org/bpf/20220201234200.1836443-1-iii@xxxxxxxxxxxxx/ v1 -> v2: * Put orig_gpr2 in place of args[1] on s390 (Vasily). * Fix arm64, powerpc and riscv (Heiko). v2: https://lore.kernel.org/bpf/20220204041955.1958263-1-iii@xxxxxxxxxxxxx/ v2 -> v3: * Undo args[1] change (Andrii). * Rename PT_REGS_SYSCALL to PT_REGS_SYSCALL_REGS (Andrii). * Split the riscv patch (Andrii). v3: https://lore.kernel.org/bpf/20220204145018.1983773-1-iii@xxxxxxxxxxxxx/ v3 -> v4: * Undo arm64's and s390's user_pt_regs changes. * Use struct pt_regs when vmlinux.h is available (Andrii). * Use offsetofend for accessing orig_gpr2 and orig_x0 (Andrii). * Move libbpf's copy of offsetofend to a new header. * Fix riscv's __PT_FP_REG. * Use PT_REGS_SYSCALL_REGS in test_probe_user.c. * Test bpf_syscall_macro with userspace headers. * Use Naveen's suggestions and code in patches 5 and 6. * Add warnings to arm64's and s390's ptrace.h (Andrii). v4: https://lore.kernel.org/bpf/20220208051635.2160304-1-iii@xxxxxxxxxxxxx/ v4 -> v5: * Go back to v3. * Do not touch arch headers. * Use CO-RE struct flavors to access orig_x0 and orig_gpr2. * Fail compilation if non-CO-RE macros are used to access the first syscall parameter on arm64 and s390. * Fix accessing frame pointer on riscv. Ilya Leoshkevich (10): selftests/bpf: Fix an endianness issue in bpf_syscall_macro test libbpf: Add PT_REGS_SYSCALL_REGS macro selftests/bpf: Use PT_REGS_SYSCALL_REGS in bpf_syscall_macro libbpf: Fix accessing syscall arguments on powerpc libbpf: Fix riscv register names libbpf: Fix accessing syscall arguments on riscv selftests/bpf: Skip test_bpf_syscall_macro:syscall_arg1 on arm64 and s390 libbpf: Allow overriding PT_REGS_PARM1{_CORE}_SYSCALL libbpf: Fix accessing the first syscall argument on arm64 libbpf: Fix accessing the first syscall argument on s390 tools/lib/bpf/bpf_tracing.h | 42 ++++++++++++++++++- .../bpf/prog_tests/test_bpf_syscall_macro.c | 4 ++ .../selftests/bpf/progs/bpf_syscall_macro.c | 9 +++- 3 files changed, 51 insertions(+), 4 deletions(-) -- 2.34.1
