Hexagon: Add syscalls (b9398a84) · Commits · e / devices / android_kernel_xiaomi_markw

arch/hexagon/include/asm/syscall.h

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			/*
			* Syscall support for the Hexagon architecture
			*
			* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 and
			* only version 2 as published by the Free Software Foundation.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
			* 02110-1301, USA.
			*/

			#ifndef _ASM_HEXAGON_SYSCALL_H
			#define _ASM_HEXAGON_SYSCALL_H

			typedef long (*syscall_fn)(unsigned long, unsigned long,
			unsigned long, unsigned long,
			unsigned long, unsigned long);

			asmlinkage int sys_execve(char __user ufilename, char __user __user *argv,
			char __user * __user *envp);
			asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
			unsigned long parent_tidp, unsigned long child_tidp);

			#define sys_execve sys_execve
			#define sys_clone sys_clone

			#include <asm-generic/syscalls.h>

			extern void *sys_call_table[];

			static inline long syscall_get_nr(struct task_struct *task,
			struct pt_regs *regs)
			{
			return regs->r06;
			}

			static inline void syscall_get_arguments(struct task_struct *task,
			struct pt_regs *regs,
			unsigned int i, unsigned int n,
			unsigned long *args)
			{
			BUG_ON(i + n > 6);
			memcpy(args, &(&regs->r00)[i], n * sizeof(args[0]));
			}
			#endif

arch/hexagon/include/asm/unistd.h

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			/*
			* Syscall support for Hexagon
			*
			* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 and
			* only version 2 as published by the Free Software Foundation.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
			* 02110-1301, USA.
			*/

			#if !defined(_ASM_HEXAGON_UNISTD_H) \|\| defined(__SYSCALL)
			#define _ASM_HEXAGON_UNISTD_H

			/*
			* The kernel pulls this unistd.h in three different ways:
			* 1. the "normal" way which gets all the __NR defines
			* 2. with __SYSCALL defined to produce function declarations
			* 3. with __SYSCALL defined to produce syscall table initialization
			* See also: syscalltab.c
			*/

			#define sys_mmap2 sys_mmap_pgoff

			#include <asm-generic/unistd.h>

			#endif

arch/hexagon/kernel/syscall.c

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			/*
			* Hexagon system calls
			*
			* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 and
			* only version 2 as published by the Free Software Foundation.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
			* 02110-1301, USA.
			*/

			#include <linux/file.h>
			#include <linux/fs.h>
			#include <linux/linkage.h>
			#include <linux/mm.h>
			#include <linux/module.h>
			#include <linux/sched.h>
			#include <linux/slab.h>
			#include <linux/syscalls.h>
			#include <linux/unistd.h>
			#include <asm/mman.h>
			#include <asm/registers.h>

			/*
			* System calls with architecture-specific wrappers.
			* See signal.c for signal-related system call wrappers.
			*/

			asmlinkage int sys_execve(char __user *ufilename,
			const char __user const __user argv,
			const char __user const __user envp)
			{
			struct pt_regs *pregs = current_thread_info()->regs;
			char *filename;
			int retval;

			filename = getname(ufilename);
			retval = PTR_ERR(filename);
			if (IS_ERR(filename))
			return retval;

			retval = do_execve(filename, argv, envp, pregs);
			putname(filename);

			return retval;
			}

			asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
			unsigned long parent_tidp, unsigned long child_tidp)
			{
			struct pt_regs *pregs = current_thread_info()->regs;

			if (!newsp)
			newsp = pregs->SP;
			return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
			(int __user *)child_tidp);
			}

			/*
			* Do a system call from the kernel, so as to have a proper pt_regs
			* and recycle the sys_execvpe infrustructure.
			*/
			int kernel_execve(const char *filename,
			const char const argv[], const char const envp[])
			{
			register unsigned long __a0 asm("r0") = (unsigned long) filename;
			register unsigned long __a1 asm("r1") = (unsigned long) argv;
			register unsigned long __a2 asm("r2") = (unsigned long) envp;
			int retval;

			__asm__ volatile(
			" R6 = #%4;\n"
			" trap0(#1);\n"
			" %0 = R0;\n"
			: "=r" (retval)
			: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
			);

			return retval;
			}
			EXPORT_SYMBOL(kernel_execve);

arch/hexagon/kernel/syscalltab.c

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			/*
			* System call table for Hexagon
			*
			* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 and
			* only version 2 as published by the Free Software Foundation.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
			* 02110-1301, USA.
			*/

			#include <linux/syscalls.h>
			#include <linux/signal.h>
			#include <linux/unistd.h>

			#include <asm/syscall.h>

			#undef __SYSCALL
			#define __SYSCALL(nr, call) [nr] = (call),

			void *sys_call_table[__NR_syscalls] = {
			#include <asm/unistd.h>
			};