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MIPS: Switch over to generic sys_execve and kernel_execve.

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This version contains a few updates by David Daney, in particular it's
now using __builtin_frame_address() instead of asm() which depending
on personal taste, is slightly more appealing.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2012-10-09 21:16:07 +02:00 committed by Al Viro
parent 8f54bcacbc
commit baf9ff74ed
7 changed files with 19 additions and 76 deletions
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6
arch/mips/include/asm/ptrace.h
View File

@ -61,4 +61,10 @@ static inline void die_if_kernel(const char *str, struct pt_regs *regs)
die(str, regs);
}
#define current_pt_regs() \
({ \
unsigned long sp = (unsigned long)__builtin_frame_address(0); \
(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
})
#endif /* _ASM_PTRACE_H */

2
arch/mips/include/asm/unistd.h
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@ -18,8 +18,10 @@
#ifndef __ASSEMBLY__
#define __ARCH_OMIT_COMPAT_SYS_GETDENTS64
#define __ARCH_WANT_KERNEL_EXECVE
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_ALARM
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_GETHOSTNAME
#define __ARCH_WANT_SYS_IPC
#define __ARCH_WANT_SYS_PAUSE

9
arch/mips/kernel/entry.S
View File

@ -192,6 +192,15 @@ syscall_exit_work:
jal syscall_trace_leave
b resume_userspace
LEAF(ret_from_kernel_execve)
move sp, a0
ori $28, sp, _THREAD_SIZE - 1
xori $28, $28, _THREAD_SIZE - 1
li v0, 0
li a3, 0
j syscall_exit_partial
END(ret_from_kernel_execve)
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT)
/*

21
arch/mips/kernel/linux32.c
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@ -3,7 +3,6 @@
*
* Copyright (C) 2000 Silicon Graphics, Inc.
* Written by Ulf Carlsson (ulfc@engr.sgi.com)
* sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
*/
#include <linux/compiler.h>
#include <linux/mm.h>
@ -77,26 +76,6 @@ SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
return error;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname(compat_ptr(regs.regs[4]));
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename->name, compat_ptr(regs.regs[5]),
compat_ptr(regs.regs[6]), &regs);
putname(filename);
out:
return error;
}
#define RLIM_INFINITY32 0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

2
arch/mips/kernel/scall64-n32.S
View File

@ -167,7 +167,7 @@ EXPORT(sysn32_call_table)
PTR sys_getsockopt
PTR sys_clone /* 6055 */
PTR sys_fork
PTR sys32_execve
PTR compat_sys_execve
PTR sys_exit
PTR compat_sys_wait4
PTR sys_kill /* 6060 */

2
arch/mips/kernel/scall64-o32.S
View File

@ -203,7 +203,7 @@ sys_call_table:
PTR sys_creat
PTR sys_link
PTR sys_unlink /* 4010 */
PTR sys32_execve
PTR compat_sys_execve
PTR sys_chdir
PTR compat_sys_time
PTR sys_mknod

53
arch/mips/kernel/syscall.c
View File

@ -127,28 +127,6 @@ _sys_clone(nabi_no_regargs struct pt_regs regs)
parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname((const char __user *) (long)regs.regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name,
(const char __user *const __user *) (long)regs.regs[5],
(const char __user *const __user *) (long)regs.regs[6],
&regs);
putname(filename);
out:
return error;
}
SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
{
struct thread_info *ti = task_thread_info(current);
@ -313,34 +291,3 @@ asmlinkage void bad_stack(void)
{
do_exit(SIGSEGV);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register unsigned long __a0 asm("$4") = (unsigned long) filename;
register unsigned long __a1 asm("$5") = (unsigned long) argv;
register unsigned long __a2 asm("$6") = (unsigned long) envp;
register unsigned long __a3 asm("$7");
unsigned long __v0;
__asm__ volatile (" \n"
" .set noreorder \n"
" li $2, %5 # __NR_execve \n"
" syscall \n"
" move %0, $2 \n"
" .set reorder \n"
: "=&r" (__v0), "=r" (__a3)
: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
"memory");
if (__a3 == 0)
return __v0;
return -__v0;
}