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ARC: make start_thread() out-of-line

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Helps move out ISA specific bits from a arch exported header

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2014-04-18 12:19:59 +05:30
parent d75386363e
commit 2ab402dfd6
2 changed files with 27 additions and 25 deletions
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29
arch/arc/include/asm/processor.h
View File

@ -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);

23
arch/arc/kernel/process.c
View File

@ -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
*/ */