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author | David Daney | 2017-06-14 01:49:38 +0200 |
---|---|---|
committer | David S. Miller | 2017-06-14 21:03:23 +0200 |
commit | 4b7190e8416d9238e995da993a7fb851996654e2 (patch) | |
tree | cd9223768849c8dc218787198acdc37d4ba2dc17 /samples/bpf/syscall_nrs.c | |
parent | bpf: Add MIPS support to samples/bpf. (diff) | |
download | kernel-qcow2-linux-4b7190e8416d9238e995da993a7fb851996654e2.tar.gz kernel-qcow2-linux-4b7190e8416d9238e995da993a7fb851996654e2.tar.xz kernel-qcow2-linux-4b7190e8416d9238e995da993a7fb851996654e2.zip |
samples/bpf: Fix tracex5 to work with MIPS syscalls.
There are two problems:
1) In MIPS the __NR_* macros expand to an expression, this causes the
sections of the object file to be named like:
.
.
.
[ 5] kprobe/(5000 + 1) PROGBITS 0000000000000000 000160 ...
[ 6] kprobe/(5000 + 0) PROGBITS 0000000000000000 000258 ...
[ 7] kprobe/(5000 + 9) PROGBITS 0000000000000000 000348 ...
.
.
.
The fix here is to use the "asm_offsets" trick to evaluate the macros
in the C compiler and generate a header file with a usable form of the
macros.
2) MIPS syscall numbers start at 5000, so we need a bigger map to hold
the sub-programs.
Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/syscall_nrs.c')
-rw-r--r-- | samples/bpf/syscall_nrs.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/samples/bpf/syscall_nrs.c b/samples/bpf/syscall_nrs.c new file mode 100644 index 000000000000..ce2a30b11248 --- /dev/null +++ b/samples/bpf/syscall_nrs.c @@ -0,0 +1,12 @@ +#include <uapi/linux/unistd.h> +#include <linux/kbuild.h> + +#define SYSNR(_NR) DEFINE(SYS ## _NR, _NR) + +void syscall_defines(void) +{ + COMMENT("Linux system call numbers."); + SYSNR(__NR_write); + SYSNR(__NR_read); + SYSNR(__NR_mmap); +} |