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libbpf: Fix comment about arc and riscv arch in bpf_tracing.h

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To make comments about arc and riscv arch in bpf_tracing.h accurate,
this patch fixes the comment about arc and adds the comment for riscv.

Signed-off-by: Kenjiro Nakayama <nakayamakenjiro@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230504035443.427927-1-nakayamakenjiro@gmail.com
This commit is contained in:
Kenjiro Nakayama 2023-05-04 12:54:43 +09:00 committed by Andrii Nakryiko
parent fedf99200a
commit 7866fc6aa0
1 changed files with 2 additions and 1 deletions
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tools/lib/bpf/bpf_tracing.h
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@ -351,6 +351,7 @@ struct pt_regs___arm64 {
* https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc#risc-v-calling-conventions
*/
/* riscv provides struct user_regs_struct instead of struct pt_regs to userspace */
#define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x))
#define __PT_PARM1_REG a0
#define __PT_PARM2_REG a1
@ -383,7 +384,7 @@ struct pt_regs___arm64 {
* https://raw.githubusercontent.com/wiki/foss-for-synopsys-dwc-arc-processors/toolchain/files/ARCv2_ABI.pdf
*/
/* arc provides struct user_pt_regs instead of struct pt_regs to userspace */
/* arc provides struct user_regs_struct instead of struct pt_regs to userspace */
#define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x))
#define __PT_PARM1_REG scratch.r0
#define __PT_PARM2_REG scratch.r1