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libbpf: Fix and complete ARC spec in bpf_tracing.h

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Add PARM6 through PARM8 definitions. Also fix frame pointer (FP)
register definition. Also leave a link to where to find ABI spec.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230120200914.3008030-9-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2023-01-20 12:08:57 -08:00 committed by Daniel Borkmann
parent b13ed8ca7f
commit 0ac0865679
1 changed files with 9 additions and 1 deletions
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10
tools/lib/bpf/bpf_tracing.h
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@ -291,6 +291,11 @@ struct pt_regs___arm64 {
#elif defined(bpf_target_arc)
/*
* Section "Function Calling Sequence" (page 24):
* 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 */
#define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x))
#define __PT_PARM1_REG scratch.r0
@ -298,8 +303,11 @@ struct pt_regs___arm64 {
#define __PT_PARM3_REG scratch.r2
#define __PT_PARM4_REG scratch.r3
#define __PT_PARM5_REG scratch.r4
#define __PT_PARM6_REG scratch.r5
#define __PT_PARM7_REG scratch.r6
#define __PT_PARM8_REG scratch.r7
#define __PT_RET_REG scratch.blink
#define __PT_FP_REG __unsupported__
#define __PT_FP_REG scratch.fp
#define __PT_RC_REG scratch.r0
#define __PT_SP_REG scratch.sp
#define __PT_IP_REG scratch.ret