diff options
| author | Ilya Leoshkevich <[email protected]> | 2022-02-09 02:17:37 +0000 |
|---|---|---|
| committer | Andrii Nakryiko <[email protected]> | 2022-02-09 05:16:14 +0000 |
| commit | c5a1ffa0da76da02afc20a0946b594830488b324 (patch) | |
| tree | 92f410beeca2af25708edf40a41051fb2c0031d3 /tools/lib/bpf/bpf_tracing.h | |
| parent | selftests/bpf: Fix an endianness issue in bpf_syscall_macro test (diff) | |
| download | kernel-c5a1ffa0da76da02afc20a0946b594830488b324.tar.gz kernel-c5a1ffa0da76da02afc20a0946b594830488b324.zip | |
libbpf: Add PT_REGS_SYSCALL_REGS macro
Architectures that select ARCH_HAS_SYSCALL_WRAPPER pass a pointer to
struct pt_regs to syscall handlers, others unpack it into individual
function parameters. Introduce a macro to describe what a particular
arch does.
Signed-off-by: Ilya Leoshkevich <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Diffstat (limited to 'tools/lib/bpf/bpf_tracing.h')
| -rw-r--r-- | tools/lib/bpf/bpf_tracing.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index 032ba809f3e5..a5e92656bfba 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -326,6 +326,16 @@ struct pt_regs; #endif /* defined(bpf_target_defined) */ +/* + * When invoked from a syscall handler kprobe, returns a pointer to a + * struct pt_regs containing syscall arguments and suitable for passing to + * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL(). + */ +#ifndef PT_REGS_SYSCALL_REGS +/* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */ +#define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx)) +#endif + #ifndef ___bpf_concat #define ___bpf_concat(a, b) a ## b #endif |