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authorVineet Gupta <vgupta@synopsys.com>2014-04-18 12:19:59 +0530
committerVineet Gupta <vgupta@synopsys.com>2014-05-05 14:22:12 +0530
commit2ab402dfd65d15a4b25a8756272ababe3ef76884 (patch)
tree7b8535d6b2998744c5a4136c29e3c73048d3f2e0 /arch/arc
parentd75386363ee60eb51c933c7b5e536f3a502ad7d7 (diff)
downloadlinux-2ab402dfd65d15a4b25a8756272ababe3ef76884.tar.gz
ARC: make start_thread() out-of-line
Helps move out ISA specific bits from a arch exported header Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/processor.h29
-rw-r--r--arch/arc/kernel/process.c23
2 files changed, 27 insertions, 25 deletions
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h
index 15334ab66b5..d99f9b37cd1 100644
--- a/arch/arc/include/asm/processor.h
+++ b/arch/arc/include/asm/processor.h
@@ -18,7 +18,6 @@
#ifndef __ASSEMBLY__
-#include <asm/arcregs.h> /* for STATUS_E1_MASK et all */
#include <asm/ptrace.h>
/* Arch specific stuff which needs to be saved per task.
@@ -41,15 +40,13 @@ struct thread_struct {
/* Forward declaration, a strange C thing */
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);
#define task_pt_regs(p) \
((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)
/* 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_FP(tsk) KSTK_REG(tsk, 0)
-/*
- * Do necessary setup to start up a newly executed thread.
- *
- * 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 void start_thread(struct pt_regs * regs, unsigned long pc,
+ unsigned long usp);
extern unsigned int get_wchan(struct task_struct *p);
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 07a3a968fe4..fdd89715d2d 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -151,6 +151,29 @@ int copy_thread(unsigned long clone_flags,
}
/*
+ * 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
*/
void flush_thread(void)