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Commit 28d353d9 authored by Al Viro's avatar Al Viro Committed by Linus Torvalds
Browse files

alpha: take kernel_execve() out of entry.S 



Signed-off-by: default avatarAl Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: default avatarMichael Cree <mcree@orcon.net.nz>
Acked-by: default avatarMatt Turner <mattst88@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent be53db6e

arch/alpha/kernel/alpha_ksyms.c

+0 −1
Original line number Diff line number Diff line
@@ -52,7 +52,6 @@ EXPORT_SYMBOL(alpha_write_fp_reg_s); 


/* entry.S */

EXPORT_SYMBOL(kernel_thread);

EXPORT_SYMBOL(kernel_execve);



/* Networking helper routines. */

EXPORT_SYMBOL(csum_tcpudp_magic);

arch/alpha/kernel/entry.S

+0 −52
Original line number Diff line number Diff line
@@ -663,58 +663,6 @@ kernel_thread: 
	br	ret_to_kernel

.end kernel_thread



/*

 * kernel_execve(path, argv, envp)

 */

	.align	4

	.globl	kernel_execve

	.ent	kernel_execve

kernel_execve:

	/* We can be called from a module.  */

	ldgp	$gp, 0($27)

	lda	$sp, -(32+SIZEOF_PT_REGS+8)($sp)

	.frame	$sp, 32+SIZEOF_PT_REGS+8, $26, 0

	stq	$26, 0($sp)

	stq	$16, 8($sp)

	stq	$17, 16($sp)

	stq	$18, 24($sp)

	.prologue 1



	lda	$16, 32($sp)

	lda	$17, 0

	lda	$18, SIZEOF_PT_REGS

	bsr	$26, memset		!samegp



	/* Avoid the HAE being gratuitously wrong, which would cause us

	   to do the whole turn off interrupts thing and restore it.  */

	ldq	$2, alpha_mv+HAE_CACHE

	stq	$2, 152+32($sp)



	ldq	$16, 8($sp)

	ldq	$17, 16($sp)

	ldq	$18, 24($sp)

	lda	$19, 32($sp)

	bsr	$26, do_execve		!samegp



	ldq	$26, 0($sp)

	bne	$0, 1f			/* error! */



	/* Move the temporary pt_regs struct from its current location

	   to the top of the kernel stack frame.  See copy_thread for

	   details for a normal process.  */

	lda	$16, 0x4000 - SIZEOF_PT_REGS($8)

	lda	$17, 32($sp)

	lda	$18, SIZEOF_PT_REGS

	bsr	$26, memmove		!samegp



	/* Take that over as our new stack frame and visit userland!  */

	lda	$sp, 0x4000 - SIZEOF_PT_REGS($8)

	br	$31, ret_from_sys_call



1:	lda	$sp, 32+SIZEOF_PT_REGS+8($sp)

	ret

.end kernel_execve





/*

 * Special system calls.  Most of these are special in that they either

arch/alpha/kernel/process.c

+19 −0
Original line number Diff line number Diff line
@@ -455,3 +455,22 @@ get_wchan(struct task_struct *p) 
	}

	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);