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Commit 59dc67b0 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: Use generic kernel_execve() implementation 



This patch enables CONFIG_GENERIC_KERNEL_EXECVE on arm64 and removes the
arm64-specific implementation of kernel_execve().

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent c34501d2

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ config ARM64 
	select GENERIC_IOMAP

	select GENERIC_IRQ_PROBE

	select GENERIC_IRQ_SHOW

	select GENERIC_KERNEL_EXECVE

	select GENERIC_KERNEL_THREAD

	select GENERIC_SMP_IDLE_THREAD

	select GENERIC_TIME_VSYSCALL

arch/arm64/kernel/entry.S

+1 −1
Original line number Diff line number Diff line
@@ -594,7 +594,7 @@ work_resched: 
/*

 * "slow" syscall return path.

 */

ENTRY(ret_to_user)

ret_to_user:

	disable_irq				// disable interrupts

	ldr	x1, [tsk, #TI_FLAGS]

	and	x2, x1, #_TIF_WORK_MASK

arch/arm64/kernel/sys.c

+0 −43
Original line number Diff line number Diff line
@@ -62,49 +62,6 @@ out: 
	return error;

}



int kernel_execve(const char *filename,

		  const char *const argv[],

		  const char *const envp[])

{

	struct pt_regs regs;

	int ret;



	memset(&regs, 0, sizeof(struct pt_regs));

	ret = do_execve(filename,

			(const char __user *const __user *)argv,

			(const char __user *const __user *)envp, &regs);

	if (ret < 0)

		goto out;



	/*

	 * Save argc to the register structure for userspace.

	 */

	regs.regs[0] = ret;



	/*

	 * We were successful.  We won't be returning to our caller, but

	 * instead to user space by manipulating the kernel stack.

	 */

	asm(	"add	x0, %0, %1\n\t"

		"mov	x1, %2\n\t"

		"mov	x2, %3\n\t"

		"bl	memmove\n\t"	/* copy regs to top of stack */

		"mov	x27, #0\n\t"	/* not a syscall */

		"mov	x28, %0\n\t"	/* thread structure */

		"mov	sp, x0\n\t"	/* reposition stack pointer */

		"b	ret_to_user"

		:

		: "r" (current_thread_info()),

		  "Ir" (THREAD_START_SP - sizeof(regs)),

		  "r" (&regs),

		  "Ir" (sizeof(regs))

		: "x0", "x1", "x2", "x27", "x28", "x30", "memory");



 out:

	return ret;

}

EXPORT_SYMBOL(kernel_execve);



asmlinkage long sys_mmap(unsigned long addr, unsigned long len,

			 unsigned long prot, unsigned long flags,

			 unsigned long fd, off_t off)