tools/testing/selftests/vDSO/vdso_call.h
Source file repositories/reference/linux-study-clean/tools/testing/selftests/vDSO/vdso_call.h
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/vDSO/vdso_call.h- Extension
.h- Size
- 1679 bytes
- Lines
- 70
- Domain
- Support Tooling And Documentation
- Bucket
- tools
- Inferred role
- Support Tooling And Documentation: implementation source
- Status
- source implementation candidate
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
#ifndef __VDSO_CALL_H__
#define __VDSO_CALL_H__
#ifdef __powerpc__
#define LOADARGS_1(fn, __arg1) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
} while (0)
#define LOADARGS_2(fn, __arg1, __arg2) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
_r4 = (long)__arg2; \
} while (0)
#define LOADARGS_3(fn, __arg1, __arg2, __arg3) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
_r4 = (long)__arg2; \
_r5 = (long)__arg3; \
} while (0)
#define LOADARGS_5(fn, __arg1, __arg2, __arg3, __arg4, __arg5) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
_r4 = (long)__arg2; \
_r5 = (long)__arg3; \
_r6 = (long)__arg4; \
_r7 = (long)__arg5; \
} while (0)
#define VDSO_CALL(fn, nr, args...) ({ \
register void *_r0 asm ("r0"); \
register long _r3 asm ("r3"); \
register long _r4 asm ("r4"); \
register long _r5 asm ("r5"); \
register long _r6 asm ("r6"); \
register long _r7 asm ("r7"); \
register long _r8 asm ("r8"); \
\
LOADARGS_##nr(fn, args); \
\
asm volatile( \
" mtctr %0\n" \
" bctrl\n" \
" bns+ 1f\n" \
" neg 3, 3\n" \
"1:" \
: "+r" (_r0), "+r" (_r3), "+r" (_r4), "+r" (_r5), \
"+r" (_r6), "+r" (_r7), "+r" (_r8) \
: \
: "r9", "r10", "r11", "r12", "cr0", "cr1", "cr5", \
"cr6", "cr7", "xer", "lr", "ctr", "memory" \
); \
_r3; \
})
#else
#define VDSO_CALL(fn, nr, args...) fn(args)
#endif
#endif
Annotation
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.