| Message ID | 20220204041955.1958263-8-iii@linux.ibm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | BPF |
| Headers | show |
| Series | libbpf: Fix accessing syscall arguments | expand |
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index 400a4f002f77..4a990111d9a8 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -145,6 +145,7 @@ /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) #define __PT_PARM1_REG regs[0] +#define __PT_PARM1_REG_SYSCALL orig_x0 #define __PT_PARM2_REG regs[1] #define __PT_PARM3_REG regs[2] #define __PT_PARM4_REG regs[3]
On arm64, the first syscall argument should be accessed via orig_x0 (see arch/arm64/include/asm/syscall.h). Currently regs[0] is used instead, leading to bpf_syscall_macro test failure. Fixes: d084df3b7a4c ("libbpf: Fix the incorrect register read for syscalls on x86_64") Reported-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- tools/lib/bpf/bpf_tracing.h | 1 + 1 file changed, 1 insertion(+)