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libbpf: Add 6th argument support for x86-64 in bpf_tracing.h

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Add r9 as register containing 6th argument on x86-64 architecture, as
per its ABI. Add also a link to a page describing ABI for easier future
reference.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230120200914.3008030-3-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2023-01-20 12:08:51 -08:00
committed by Andrii Nakryiko
parent c94a3fd806
commit 4759a83309
1 changed files with 6 additions and 0 deletions
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6
src/bpf_tracing.h
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@@ -78,6 +78,10 @@
#if defined(bpf_target_x86)
/*
* https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI
*/
#if defined(__KERNEL__) || defined(__VMLINUX_H__)
#define __PT_PARM1_REG di
@@ -85,6 +89,7 @@
#define __PT_PARM3_REG dx
#define __PT_PARM4_REG cx
#define __PT_PARM5_REG r8
#define __PT_PARM6_REG r9
#define __PT_RET_REG sp
#define __PT_FP_REG bp
#define __PT_RC_REG ax
@@ -115,6 +120,7 @@
#define __PT_PARM3_REG rdx
#define __PT_PARM4_REG rcx
#define __PT_PARM5_REG r8
#define __PT_PARM6_REG r9
#define __PT_RET_REG rsp
#define __PT_FP_REG rbp
#define __PT_RC_REG rax