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libbpf: Fix register in PT_REGS MIPS macros 

The o32, n32 and n64 calling conventions require the return
value to be stored in $v0 which maps to $2 register, i.e.,
the register 2.

Fixes: c1932cd ("bpf: Add MIPS support to samples/bpf.")
Signed-off-by: Jerry Crunchtime <jerry.c.t@web.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/43707d31-0210-e8f0-9226-1af140907641@web.de
This commit is contained in:
Jerry Crunchtime 2020-07-31 17:08:01 +02:00 committed by Daniel Borkmann
parent c64c9c282a
commit 1acf8f90ea
1 changed files with 2 additions and 2 deletions
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4
tools/lib/bpf/bpf_tracing.h
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@ -215,7 +215,7 @@ struct pt_regs;
#define PT_REGS_PARM5(x) ((x)->regs[8])
#define PT_REGS_RET(x) ((x)->regs[31])
#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_RC(x) ((x)->regs[1])
#define PT_REGS_RC(x) ((x)->regs[2])
#define PT_REGS_SP(x) ((x)->regs[29])
#define PT_REGS_IP(x) ((x)->cp0_epc)
@ -226,7 +226,7 @@ struct pt_regs;
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8])
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31])
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[1])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[2])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29])
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc)