82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* x86_64 specific definitions for NOLIBC
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* Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu>
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*/
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#ifndef _NOLIBC_ARCH_X86_64_H
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#define _NOLIBC_ARCH_X86_64_H
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#include "compiler.h"
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#include "linux-uefi-syscalls.h"
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/* The struct returned by the stat() syscall, equivalent to stat64(). The
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* syscall returns 116 bytes and stops in the middle of __unused.
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*/
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struct sys_stat_struct {
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unsigned long st_dev;
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unsigned long st_ino;
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unsigned long st_nlink;
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unsigned int st_mode;
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unsigned int st_uid;
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unsigned int st_gid;
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unsigned int __pad0;
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unsigned long st_rdev;
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long st_size;
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long st_blksize;
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long st_blocks;
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unsigned long st_atime;
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unsigned long st_atime_nsec;
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unsigned long st_mtime;
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unsigned long st_mtime_nsec;
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unsigned long st_ctime;
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unsigned long st_ctime_nsec;
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long __unused[3];
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};
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/* Syscalls for x86_64 :
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* - registers are 64-bit
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* - syscall number is passed in rax
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* - arguments are in rdi, rsi, rdx, r10, r8, r9 respectively
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* - the system call is performed by calling the syscall instruction
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* - syscall return comes in rax
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* - rcx and r11 are clobbered, others are preserved.
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* - the arguments are cast to long and assigned into the target registers
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* which are then simply passed as registers to the asm code, so that we
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* don't have to experience issues with register constraints.
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* - the syscall number is always specified last in order to allow to force
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* some registers before (gcc refuses a %-register at the last position).
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* - see also x86-64 ABI section A.2 AMD64 Linux Kernel Conventions, A.2.1
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* Calling Conventions.
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*
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* Link x86-64 ABI: https://gitlab.com/x86-psABIs/x86-64-ABI/-/wikis/home
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*
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*/
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#define my_syscall0(num) \
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({ \
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uint64_t args[] = {0}; \
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long _ret = syscall_emu_x86_64(num, args); \
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_ret; \
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})
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#define my_syscall1(num, ...) \
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({ \
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uint64_t args[] = {__VA_ARGS__}; \
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long _ret = syscall_emu_x86_64(num, args); \
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_ret; \
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})
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#define my_syscall2 my_syscall1
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#define my_syscall3 my_syscall1
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#define my_syscall4 my_syscall1
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#define my_syscall5 my_syscall1
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#define my_syscall6 my_syscall1
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char **environ __attribute__((weak));
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const unsigned long *_auxv __attribute__((weak));
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#endif /* _NOLIBC_ARCH_X86_64_H */
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