AcoSail/kernel_optimize_test
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alpha: introduce ret_from_kernel_execve(), switch to generic kernel_execve()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-05-31 22:22:52 -04:00
parent cba1ec7e88
commit 44f4b56b54
3 changed files with 14 additions and 19 deletions
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1
arch/alpha/include/asm/unistd.h
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@ -482,6 +482,7 @@
#define __ARCH_WANT_SYS_SIGPENDING #define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE #define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_KERNEL_EXECVE
/* "Conditional" syscalls. What we want is /* "Conditional" syscalls. What we want is

13
arch/alpha/kernel/entry.S
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@ -626,6 +626,19 @@ ret_from_kernel_thread:
jmp $31, sys_exit jmp $31, sys_exit
.end ret_from_kernel_thread .end ret_from_kernel_thread
.globl ret_from_kernel_execve
.align 4
.ent ret_from_kernel_execve
ret_from_kernel_execve:
mov $16, $sp
/* Avoid the HAE being gratuitously wrong, to avoid restoring it. */
ldq $2, alpha_mv+HAE_CACHE
stq $2, 152($sp) /* HAE */
mov $31, $19 /* to disable syscall restarts */
br $31, ret_to_user
.end ret_from_kernel_execve
/* /*
* Special system calls. Most of these are special in that they either * Special system calls. Most of these are special in that they either

19
arch/alpha/kernel/process.c
View File

@ -435,22 +435,3 @@ get_wchan(struct task_struct *p)
} }
return pc; return pc;
} }
int kernel_execve(const char *path, const char *const argv[], const char *const envp[])
{
/* Avoid the HAE being gratuitously wrong, which would cause us
to do the whole turn off interrupts thing and restore it. */
struct pt_regs regs = {.hae = alpha_mv.hae_cache};
int err = do_execve(path, argv, envp, &regs);
if (!err) {
struct pt_regs *p = current_pt_regs();
/* copy regs to normal position and off to userland we go... */
*p = regs;
__asm__ __volatile__ (
"mov %0, $sp;"
"br $31, ret_from_sys_call"
: : "r"(p));
}
return err;
}
EXPORT_SYMBOL(kernel_execve);