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libbpf: Define x86-64 syscall regs spec in bpf_tracing.h

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Define explicit table of registers used for syscall argument passing.
Remove now unnecessary overrides of PT_REGS_PARM5_[CORE_]SYSCALL macros.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230120200914.3008030-14-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2023-01-20 12:09:02 -08:00 committed by Daniel Borkmann
parent 8ccabeef91
commit d21fbceedd
1 changed files with 19 additions and 6 deletions
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25
tools/lib/bpf/bpf_tracing.h
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@ -90,14 +90,22 @@
#define __PT_PARM4_REG cx
#define __PT_PARM5_REG r8
#define __PT_PARM6_REG r9
/*
* Syscall uses r10 for PARM4. See arch/x86/entry/entry_64.S:entry_SYSCALL_64
* comments in Linux sources. And refer to syscall(2) manpage.
*/
#define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG
#define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG
#define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG
#define __PT_PARM4_SYSCALL_REG r10
#define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG
#define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG
#define __PT_RET_REG sp
#define __PT_FP_REG bp
#define __PT_RC_REG ax
#define __PT_SP_REG sp
#define __PT_IP_REG ip
/* syscall uses r10 for PARM4 */
#define PT_REGS_PARM4_SYSCALL(x) ((x)->r10)
#define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10)
#else
@ -121,14 +129,19 @@
#define __PT_PARM4_REG rcx
#define __PT_PARM5_REG r8
#define __PT_PARM6_REG r9
#define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG
#define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG
#define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG
#define __PT_PARM4_SYSCALL_REG r10
#define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG
#define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG
#define __PT_RET_REG rsp
#define __PT_FP_REG rbp
#define __PT_RC_REG rax
#define __PT_SP_REG rsp
#define __PT_IP_REG rip
/* syscall uses r10 for PARM4 */
#define PT_REGS_PARM4_SYSCALL(x) ((x)->r10)
#define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10)
#endif /* __i386__ */