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Commit 2ab402df authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: make start_thread() out-of-line 



Helps move out ISA specific bits from a arch exported header

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent d7538636

arch/arc/include/asm/processor.h

+4 −25
Original line number Original line Diff line number Diff line
@@ -18,7 +18,6 @@ 




#ifndef __ASSEMBLY__

#ifndef __ASSEMBLY__





#include <asm/arcregs.h>	/* for STATUS_E1_MASK et all */

#include <asm/ptrace.h>

#include <asm/ptrace.h>





/* Arch specific stuff which needs to be saved per task.

/* Arch specific stuff which needs to be saved per task.
@@ -41,15 +40,13 @@ struct thread_struct { 
/* Forward declaration, a strange C thing */

/* Forward declaration, a strange C thing */

struct task_struct;

struct task_struct;





/*

/* Return saved PC of a blocked thread  */

 * Return saved PC of a blocked thread.

 */

unsigned long thread_saved_pc(struct task_struct *t);

unsigned long thread_saved_pc(struct task_struct *t);





#define task_pt_regs(p) \

#define task_pt_regs(p) \

	((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)

	((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)





/* Free all resources held by a thread. */

/* Free all resources held by a thread */

#define release_thread(thread) do { } while (0)

#define release_thread(thread) do { } while (0)





/* Prepare to copy thread state - unlazy all lazy status */

/* Prepare to copy thread state - unlazy all lazy status */
@@ -82,26 +79,8 @@ unsigned long thread_saved_pc(struct task_struct *t); 
#define KSTK_BLINK(tsk) KSTK_REG(tsk, 4)

#define KSTK_BLINK(tsk) KSTK_REG(tsk, 4)

#define KSTK_FP(tsk)    KSTK_REG(tsk, 0)

#define KSTK_FP(tsk)    KSTK_REG(tsk, 0)





/*

extern void start_thread(struct pt_regs * regs, unsigned long pc,

 * Do necessary setup to start up a newly executed thread.

			 unsigned long usp);

 *

 * E1,E2 so that Interrupts are enabled in user mode

 * L set, so Loop inhibited to begin with

 * lp_start and lp_end seeded with bogus non-zero values so to easily catch

 * the ARC700 sr to lp_start hardware bug

 */

#define start_thread(_regs, _pc, _usp)				\

do {								\

	set_fs(USER_DS); /* reads from user space */		\

	(_regs)->ret = (_pc);					\

	/* Interrupts enabled in User Mode */			\

	(_regs)->status32 = STATUS_U_MASK | STATUS_L_MASK	\

		| STATUS_E1_MASK | STATUS_E2_MASK;		\

	(_regs)->sp = (_usp);					\

	/* bogus seed values for debugging */			\

	(_regs)->lp_start = 0x10;				\

	(_regs)->lp_end = 0x80;					\

} while (0)





extern unsigned int get_wchan(struct task_struct *p);

extern unsigned int get_wchan(struct task_struct *p);

arch/arc/kernel/process.c

+23 −0
Original line number Original line Diff line number Diff line
@@ -150,6 +150,29 @@ int copy_thread(unsigned long clone_flags, 
	return 0;

	return 0;

}

}





/*

 * Do necessary setup to start up a new user task

 */

void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp)

{

	set_fs(USER_DS); /* user space */



	regs->sp = usp;

	regs->ret = pc;



	/*

	 * [U]ser Mode bit set

	 * [L] ZOL loop inhibited to begin with - cleared by a LP insn

	 * Interrupts enabled

	 */

	regs->status32 = STATUS_U_MASK | STATUS_L_MASK |

			 STATUS_E1_MASK | STATUS_E2_MASK;



	/* bogus seed values for debugging */

	regs->lp_start = 0x10;

	regs->lp_end = 0x80;

}



/*

/*

 * Some archs flush debug and FPU info here

 * Some archs flush debug and FPU info here

 */

 */