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https://github.com/edk2-porting/linux-next.git
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d35c7b0e54
This replaces the duplicated arch-specific versions of "sys_pipe()" with one unified implementation. This removes almost 250 lines of duplicated code. It's marked __weak, so that *if* an architecture wants to override the default implementation it can do so by simply having its own replacement version, since many architectures use alternate calling conventions for the 'pipe()' system call for legacy reasons (ie traditional UNIX implementations often return the two file descriptors in registers) I still haven't changed the cris version even though Linus says the BKL isn't needed. The arch maintainer can easily do it if there are really no obstacles. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* arch/sh/kernel/sys_sh64.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/SH5
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* platform.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/errno.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <linux/syscalls.h>
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#include <linux/ipc.h>
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#include <asm/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/unistd.h>
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
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register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
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register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
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register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
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__asm__ __volatile__ ("trapa %1 !\t\t\t execve(%2,%3,%4)"
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: "=r" (__sc0)
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: "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
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__asm__ __volatile__ ("!dummy %0 %1 %2 %3"
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: : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
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return __sc0;
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}
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