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Diffstat (limited to 'arch/m68k/kernel/process.c')
-rw-r--r--arch/m68k/kernel/process.c161
1 files changed, 85 insertions, 76 deletions
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index c55ff719fa72..f5a07a70e938 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/m68k/kernel/process.c
*
@@ -13,6 +14,9 @@
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
@@ -26,31 +30,19 @@
#include <linux/init_task.h>
#include <linux/mqueue.h>
#include <linux/rcupdate.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/elfcore.h>
-#include <asm/uaccess.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/setup.h>
-#include <asm/pgtable.h>
+#include "process.h"
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
-
-/*
- * Return saved PC from a blocked thread
- */
-unsigned long thread_saved_pc(struct task_struct *tsk)
-{
- struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
- /* Check whether the thread is blocked in resume() */
- if (in_sched_functions(sw->retpc))
- return ((unsigned long *)sw->a6)[1];
- else
- return sw->retpc;
-}
-
void arch_cpu_idle(void)
{
#if defined(MACH_ATARI_ONLY)
@@ -77,32 +69,31 @@ void machine_halt(void)
void machine_power_off(void)
{
- if (mach_power_off)
- mach_power_off();
+ do_kernel_power_off();
for (;;);
}
-void (*pm_power_off)(void) = machine_power_off;
+void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
void show_regs(struct pt_regs * regs)
{
- printk("\n");
- printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
- regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
- printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
- regs->orig_d0, regs->d0, regs->a2, regs->a1);
- printk("A0: %08lx D5: %08lx D4: %08lx\n",
- regs->a0, regs->d5, regs->d4);
- printk("D3: %08lx D2: %08lx D1: %08lx\n",
- regs->d3, regs->d2, regs->d1);
+ pr_info("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
+ regs->format, regs->vector, regs->pc, regs->sr,
+ print_tainted());
+ pr_info("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
+ regs->orig_d0, regs->d0, regs->a2, regs->a1);
+ pr_info("A0: %08lx D5: %08lx D4: %08lx\n", regs->a0, regs->d5,
+ regs->d4);
+ pr_info("D3: %08lx D2: %08lx D1: %08lx\n", regs->d3, regs->d2,
+ regs->d1);
if (!(regs->sr & PS_S))
- printk("USP: %08lx\n", rdusp());
+ pr_info("USP: %08lx\n", rdusp());
}
void flush_thread(void)
{
- current->thread.fs = __USER_DS;
+ current->thread.fc = USER_DATA;
#ifdef CONFIG_FPU
if (!FPU_IS_EMU) {
unsigned long zero = 0;
@@ -117,21 +108,42 @@ void flush_thread(void)
* on top of pt_regs, which means that sys_clone() arguments would be
* buried. We could, of course, copy them, but it's too costly for no
* good reason - generic clone() would have to copy them *again* for
- * do_fork() anyway. So in this case it's actually better to pass pt_regs *
- * and extract arguments for do_fork() from there. Eventually we might
- * go for calling do_fork() directly from the wrapper, but only after we
- * are finished with do_fork() prototype conversion.
+ * kernel_clone() anyway. So in this case it's actually better to pass pt_regs *
+ * and extract arguments for kernel_clone() from there. Eventually we might
+ * go for calling kernel_clone() directly from the wrapper, but only after we
+ * are finished with kernel_clone() prototype conversion.
*/
asmlinkage int m68k_clone(struct pt_regs *regs)
{
/* regs will be equal to current_pt_regs() */
- return do_fork(regs->d1, regs->d2, 0,
- (int __user *)regs->d3, (int __user *)regs->d4);
+ struct kernel_clone_args args = {
+ .flags = (u32)(regs->d1) & ~CSIGNAL,
+ .pidfd = (int __user *)regs->d3,
+ .child_tid = (int __user *)regs->d4,
+ .parent_tid = (int __user *)regs->d3,
+ .exit_signal = regs->d1 & CSIGNAL,
+ .stack = regs->d2,
+ .tls = regs->d5,
+ };
+
+ return kernel_clone(&args);
}
-int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long arg, struct task_struct *p)
+/*
+ * Because extra registers are saved on the stack after the sys_clone3()
+ * arguments, this C wrapper extracts them from pt_regs * and then calls the
+ * generic sys_clone3() implementation.
+ */
+asmlinkage int m68k_clone3(struct pt_regs *regs)
{
+ return sys_clone3((struct clone_args __user *)regs->d1, regs->d2);
+}
+
+int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+ u64 clone_flags = args->flags;
+ unsigned long usp = args->stack;
+ unsigned long tls = args->tls;
struct fork_frame {
struct switch_stack sw;
struct pt_regs regs;
@@ -146,14 +158,14 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
* Must save the current SFC/DFC value, NOT the value when
* the parent was last descheduled - RGH 10-08-96
*/
- p->thread.fs = get_fs().seg;
+ p->thread.fc = USER_DATA;
- if (unlikely(p->flags & PF_KTHREAD)) {
+ if (unlikely(args->fn)) {
/* kernel thread */
memset(frame, 0, sizeof(struct fork_frame));
frame->regs.sr = PS_S;
- frame->sw.a3 = usp; /* function */
- frame->sw.d7 = arg;
+ frame->sw.a3 = (unsigned long)args->fn;
+ frame->sw.d7 = (unsigned long)args->fn_arg;
frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
p->thread.usp = 0;
return 0;
@@ -165,7 +177,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
p->thread.usp = usp ?: rdusp();
if (clone_flags & CLONE_SETTLS)
- task_thread_info(p)->tp_value = frame->regs.d5;
+ task_thread_info(p)->tp_value = tls;
#ifdef CONFIG_FPU
if (!FPU_IS_EMU) {
@@ -203,11 +215,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
}
/* Fill in the fpu structure for a core dump. */
-#ifdef CONFIG_FPU
-int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
+int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
{
- char fpustate[216];
-
if (FPU_IS_EMU) {
int i;
@@ -222,45 +231,45 @@ int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
return 1;
}
- /* First dump the fpu context to avoid protocol violation. */
- asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
- if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
- return 0;
+ if (IS_ENABLED(CONFIG_FPU)) {
+ char fpustate[216];
- if (CPU_IS_COLDFIRE) {
- asm volatile ("fmovel %/fpiar,%0\n\t"
- "fmovel %/fpcr,%1\n\t"
- "fmovel %/fpsr,%2\n\t"
- "fmovemd %/fp0-%/fp7,%3"
- :
- : "m" (fpu->fpcntl[0]),
- "m" (fpu->fpcntl[1]),
- "m" (fpu->fpcntl[2]),
- "m" (fpu->fpregs[0])
- : "memory");
- } else {
- asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
- :
- : "m" (fpu->fpcntl[0])
- : "memory");
- asm volatile ("fmovemx %/fp0-%/fp7,%0"
- :
- : "m" (fpu->fpregs[0])
- : "memory");
+ /* First dump the fpu context to avoid protocol violation. */
+ asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
+ if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
+ return 0;
+
+ if (CPU_IS_COLDFIRE) {
+ asm volatile ("fmovel %/fpiar,%0\n\t"
+ "fmovel %/fpcr,%1\n\t"
+ "fmovel %/fpsr,%2\n\t"
+ "fmovemd %/fp0-%/fp7,%3"
+ :
+ : "m" (fpu->fpcntl[0]),
+ "m" (fpu->fpcntl[1]),
+ "m" (fpu->fpcntl[2]),
+ "m" (fpu->fpregs[0])
+ : "memory");
+ } else {
+ asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
+ :
+ : "m" (fpu->fpcntl[0])
+ : "memory");
+ asm volatile ("fmovemx %/fp0-%/fp7,%0"
+ :
+ : "m" (fpu->fpregs[0])
+ : "memory");
+ }
}
return 1;
}
-EXPORT_SYMBOL(dump_fpu);
-#endif /* CONFIG_FPU */
-unsigned long get_wchan(struct task_struct *p)
+unsigned long __get_wchan(struct task_struct *p)
{
unsigned long fp, pc;
unsigned long stack_page;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
- return 0;
stack_page = (unsigned long)task_stack_page(p);
fp = ((struct switch_stack *)p->thread.ksp)->a6;
generated by cgit (git 2.34.1) at 2025-12-21 23:48:33 +0000