tools/include/nolibc/arch-sparc.h

Source file repositories/reference/linux-study-clean/tools/include/nolibc/arch-sparc.h

File Facts

System
Linux kernel
Corpus path
tools/include/nolibc/arch-sparc.h
Extension
.h
Size
9091 bytes
Lines
210
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _NOLIBC_ARCH_SPARC_H
#define _NOLIBC_ARCH_SPARC_H

#include <linux/unistd.h>

#include "compiler.h"
#include "crt.h"

/*
 * Syscalls for SPARC:
 *   - registers are native word size
 *   - syscall number is passed in g1
 *   - arguments are in o0-o5
 *   - the system call is performed by calling a trap instruction
 *   - syscall return value is in o0
 *   - syscall error flag is in the carry bit of the processor status register
 */

#ifdef __arch64__

#define _NOLIBC_SYSCALL "t	0x6d\n"                                       \
			"bcs,a	%%xcc, 1f\n"                                  \
			"sub	%%g0, %%o0, %%o0\n"                           \
			"1:\n"

#else

#define _NOLIBC_SYSCALL "t	0x10\n"                                       \
			"bcs,a	1f\n"                                         \
			"sub	%%g0, %%o0, %%o0\n"                           \
			"1:\n"

#endif /* __arch64__ */

#define __nolibc_syscall0(num)                                                \
({                                                                            \
	register long _num  __asm__ ("g1") = (num);                           \
	register long _arg1 __asm__ ("o0");                                   \
									      \
	__asm__ volatile (                                                    \
		_NOLIBC_SYSCALL                                               \
		: "+r"(_arg1)                                                 \
		: "r"(_num)                                                   \
		: "memory", "cc"                                              \
	);                                                                    \
	_arg1;                                                                \
})

#define __nolibc_syscall1(num, arg1)                                          \
({                                                                            \
	register long _num  __asm__ ("g1") = (num);                           \
	register long _arg1 __asm__ ("o0") = (long)(arg1);                    \
									      \
	__asm__ volatile (                                                    \
		_NOLIBC_SYSCALL                                               \
		: "+r"(_arg1)                                                 \
		: "r"(_num)                                                   \
		: "memory", "cc"                                              \
	);                                                                    \
	_arg1;                                                                \
})

#define __nolibc_syscall2(num, arg1, arg2)                                    \
({                                                                            \
	register long _num  __asm__ ("g1") = (num);                           \
	register long _arg1 __asm__ ("o0") = (long)(arg1);                    \
	register long _arg2 __asm__ ("o1") = (long)(arg2);                    \
									      \
	__asm__ volatile (                                                    \
		_NOLIBC_SYSCALL                                               \
		: "+r"(_arg1)                                                 \
		: "r"(_arg2), "r"(_num)                                       \
		: "memory", "cc"                                              \
	);                                                                    \
	_arg1;                                                                \
})

#define __nolibc_syscall3(num, arg1, arg2, arg3)                              \
({                                                                            \
	register long _num  __asm__ ("g1") = (num);                           \
	register long _arg1 __asm__ ("o0") = (long)(arg1);                    \
	register long _arg2 __asm__ ("o1") = (long)(arg2);                    \
	register long _arg3 __asm__ ("o2") = (long)(arg3);                    \
									      \
	__asm__ volatile (                                                    \
		_NOLIBC_SYSCALL                                               \
		: "+r"(_arg1)                                                 \
		: "r"(_arg2), "r"(_arg3), "r"(_num)                           \
		: "memory", "cc"                                              \
	);                                                                    \

Annotation

Implementation Notes