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Diffstat (limited to 'arch/microblaze/kernel/process.c')
-rw-r--r--arch/microblaze/kernel/process.c108
1 files changed, 36 insertions, 72 deletions
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 1944e00f07e1..fa0ea609137c 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -8,39 +8,39 @@
* for more details.
*/
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/tick.h>
#include <linux/bitops.h>
+#include <linux/ptrace.h>
#include <asm/pgalloc.h>
-#include <asm/uaccess.h> /* for USER_DS macros */
+#include <linux/uaccess.h> /* for USER_DS macros */
#include <asm/cacheflush.h>
void show_regs(struct pt_regs *regs)
{
- printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->pt_mode);
- printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
+ pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode);
+ pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
regs->r1, regs->r2, regs->r3, regs->r4);
- printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
+ pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
regs->r5, regs->r6, regs->r7, regs->r8);
- printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
+ pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
regs->r9, regs->r10, regs->r11, regs->r12);
- printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
+ pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
regs->r13, regs->r14, regs->r15, regs->r16);
- printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
+ pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
regs->r17, regs->r18, regs->r19, regs->r20);
- printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
+ pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
regs->r21, regs->r22, regs->r23, regs->r24);
- printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
+ pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
regs->r25, regs->r26, regs->r27, regs->r28);
- printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
+ pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
regs->r29, regs->r30, regs->r31, regs->pc);
- printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
+ pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
regs->msr, regs->ear, regs->esr, regs->fsr);
}
-void (*pm_idle)(void);
void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
@@ -97,15 +97,10 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- void (*idle)(void) = pm_idle;
-
- if (!idle)
- idle = default_idle;
-
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched())
- idle();
+ default_idle();
rcu_idle_exit();
tick_nohz_idle_exit();
@@ -119,46 +114,38 @@ void flush_thread(void)
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
- struct task_struct *p, struct pt_regs *regs)
+ unsigned long arg, struct task_struct *p)
{
struct pt_regs *childregs = task_pt_regs(p);
struct thread_info *ti = task_thread_info(p);
- *childregs = *regs;
- if (user_mode(regs))
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ /* if we're creating a new kernel thread then just zeroing all
+ * the registers. That's OK for a brand new thread.*/
+ memset(childregs, 0, sizeof(struct pt_regs));
+ memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
+ ti->cpu_context.r1 = (unsigned long)childregs;
+ ti->cpu_context.r20 = (unsigned long)usp; /* fn */
+ ti->cpu_context.r19 = (unsigned long)arg;
+ childregs->pt_mode = 1;
+ local_save_flags(childregs->msr);
+#ifdef CONFIG_MMU
+ ti->cpu_context.msr = childregs->msr & ~MSR_IE;
+#endif
+ ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
+ return 0;
+ }
+ *childregs = *current_pt_regs();
+ if (usp)
childregs->r1 = usp;
- else
- childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
-#ifndef CONFIG_MMU
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;
+#ifndef CONFIG_MMU
ti->cpu_context.msr = (unsigned long)childregs->msr;
#else
+ childregs->msr |= MSR_UMS;
- /* if creating a kernel thread then update the current reg (we don't
- * want to use the parent's value when restoring by POP_STATE) */
- if (kernel_mode(regs))
- /* save new current on stack to use POP_STATE */
- childregs->CURRENT_TASK = (unsigned long)p;
- /* if returning to user then use the parent's value of this register */
-
- /* if we're creating a new kernel thread then just zeroing all
- * the registers. That's OK for a brand new thread.*/
- /* Pls. note that some of them will be restored in POP_STATE */
- if (kernel_mode(regs))
- memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
- /* if this thread is created for fork/vfork/clone, then we want to
- * restore all the parent's context */
- /* in addition to the registers which will be restored by POP_STATE */
- else {
- ti->cpu_context = *(struct cpu_context *)regs;
- childregs->msr |= MSR_UMS;
- }
-
- /* FIXME STATE_SAVE_PT_OFFSET; */
- ti->cpu_context.r1 = (unsigned long)childregs;
/* we should consider the fact that childregs is a copy of the parent
* regs which were saved immediately after entering the kernel state
* before enabling VM. This MSR will be restored in switch_to and
@@ -169,7 +156,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
* excepting for VM and UMS
* don't touch UMS , CARRY and cache bits
* right now MSR is a copy of parent one */
- childregs->msr |= MSR_BIP;
childregs->msr &= ~MSR_EIP;
childregs->msr |= MSR_IE;
childregs->msr &= ~MSR_VM;
@@ -209,29 +195,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
}
#endif
-static void kernel_thread_helper(int (*fn)(void *), void *arg)
-{
- fn(arg);
- do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(&regs, 0, sizeof(regs));
- /* store them in non-volatile registers */
- regs.r5 = (unsigned long)fn;
- regs.r6 = (unsigned long)arg;
- local_save_flags(regs.msr);
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.pt_mode = 1;
-
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- &regs, 0, NULL, NULL);
-}
-EXPORT_SYMBOL_GPL(kernel_thread);
-
unsigned long get_wchan(struct task_struct *p)
{
/* TBD (used by procfs) */
@@ -246,6 +209,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
regs->pt_mode = 0;
#ifdef CONFIG_MMU
regs->msr |= MSR_UMS;
+ regs->msr &= ~MSR_VM;
#endif
}
generated by cgit v1.2.3 (git 2.0.4) at 2025-09-11 20:10:54 +0000