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authorAl Viro <viro@zeniv.linux.org.uk>2012-08-31 15:48:05 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-30 23:35:51 -0400
commitbe6abfa769fa07ce89ac73273360b335ae978805 (patch)
treee6b9ba23767a93839c5e4e14f197d4781bf95cf4 /arch/powerpc
parent58254e1002a82eb383c5977ad9fd5a451b91fe29 (diff)
powerpc: switch to generic sys_execve()/kernel_execve()
the only non-obvious part is that current_pt_regs() is really needed here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace uses (the thing task_pt_regs() is intended for), but not for us. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/ptrace.h2
-rw-r--r--arch/powerpc/include/asm/syscalls.h3
-rw-r--r--arch/powerpc/include/asm/unistd.h2
-rw-r--r--arch/powerpc/kernel/entry_32.S5
-rw-r--r--arch/powerpc/kernel/entry_64.S6
-rw-r--r--arch/powerpc/kernel/misc.S7
-rw-r--r--arch/powerpc/kernel/process.c25
-rw-r--r--arch/powerpc/kernel/sys_ppc32.c22
8 files changed, 21 insertions, 51 deletions
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 9c21ed42aba6..f76b88c367d1 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -125,6 +125,8 @@ extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
extern int ptrace_put_reg(struct task_struct *task, int regno,
unsigned long data);
+#define current_pt_regs() \
+ ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
/*
* We use the least-significant bit of the trap field to indicate
* whether we have saved the full set of registers, or only a
diff --git a/arch/powerpc/include/asm/syscalls.h b/arch/powerpc/include/asm/syscalls.h
index 4084e567d28e..329db4ec12ca 100644
--- a/arch/powerpc/include/asm/syscalls.h
+++ b/arch/powerpc/include/asm/syscalls.h
@@ -17,9 +17,6 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
asmlinkage unsigned long sys_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff);
-asmlinkage int sys_execve(unsigned long a0, unsigned long a1,
- unsigned long a2, unsigned long a3, unsigned long a4,
- unsigned long a5, struct pt_regs *regs);
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long usp,
int __user *parent_tidp, void __user *child_threadptr,
int __user *child_tidp, int p6, struct pt_regs *regs);
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index bd377a368611..26a6825909b6 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -420,6 +420,8 @@
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_NEWFSTATAT
#endif
+#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
/*
* "Conditional" syscalls
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 6eb330a87c36..e6be75fc491a 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -446,6 +446,11 @@ ret_from_kernel_thread:
li r3,0
b do_exit # no return
+ .globl __ret_from_kernel_execve
+__ret_from_kernel_execve:
+ addi r1,r3,-STACK_FRAME_OVERHEAD
+ b ret_from_syscall
+
/* Traced system call support */
syscall_dotrace:
SAVE_NVGPRS(r1)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d7f4fafc7515..1ca3d9fa48c4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -380,6 +380,12 @@ _GLOBAL(ret_from_kernel_thread)
li r3,0
b .do_exit # no return
+_GLOBAL(__ret_from_kernel_execve)
+ addi r1,r3,-STACK_FRAME_OVERHEAD
+ li r10,1
+ std r10,SOFTE(r1)
+ b syscall_exit
+
.section ".toc","aw"
DSCR_DEFAULT:
.tc dscr_default[TC],dscr_default
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index ba16874fe294..7ce26d45777e 100644
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -54,13 +54,6 @@ _GLOBAL(add_reloc_offset)
.align 3
2: PPC_LONG 1b
-_GLOBAL(kernel_execve)
- li r0,__NR_execve
- sc
- bnslr
- neg r3,r3
- blr
-
_GLOBAL(setjmp)
mflr r0
PPC_STL r0,0(r3)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 3b06898fa175..6fdf044f475c 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1064,26 +1064,13 @@ int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
regs, 0, NULL, NULL);
}
-int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
- unsigned long a3, unsigned long a4, unsigned long a5,
- struct pt_regs *regs)
+void __ret_from_kernel_execve(struct pt_regs *normal)
+__noreturn;
+
+void ret_from_kernel_execve(struct pt_regs *normal)
{
- int error;
- char *filename;
-
- filename = getname((const char __user *) a0);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- flush_fp_to_thread(current);
- flush_altivec_to_thread(current);
- flush_spe_to_thread(current);
- error = do_execve(filename,
- (const char __user *const __user *) a1,
- (const char __user *const __user *) a2, regs);
- putname(filename);
-out:
- return error;
+ set_thread_flag(TIF_RESTOREALL);
+ __ret_from_kernel_execve(normal);
}
static inline int valid_irq_stack(unsigned long sp, struct task_struct *p,
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
index 81c570633ead..a1ae73a0f352 100644
--- a/arch/powerpc/kernel/sys_ppc32.c
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -187,28 +187,6 @@ asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd, compat_loff_t __user
return ret;
}
-long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
- unsigned long a3, unsigned long a4, unsigned long a5,
- struct pt_regs *regs)
-{
- int error;
- char * filename;
-
- filename = getname((char __user *) a0);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- flush_fp_to_thread(current);
- flush_altivec_to_thread(current);
-
- error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
-
- putname(filename);
-
-out:
- return error;
-}
-
/* Note: it is necessary to treat option as an unsigned int,
* with the corresponding cast to a signed int to insure that the
* proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)