1 /* process.c: FRV specific parts of process handling
3 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from arch/m68k/kernel/process.c
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/sched/debug.h>
17 #include <linux/sched/task.h>
18 #include <linux/sched/task_stack.h>
19 #include <linux/kernel.h>
21 #include <linux/smp.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/elf.h>
28 #include <linux/reboot.h>
29 #include <linux/interrupt.h>
30 #include <linux/pagemap.h>
31 #include <linux/rcupdate.h>
33 #include <asm/asm-offsets.h>
34 #include <linux/uaccess.h>
35 #include <asm/setup.h>
36 #include <asm/pgtable.h>
38 #include <asm/gdb-stub.h>
39 #include <asm/mb-regs.h>
43 asmlinkage void ret_from_fork(void);
44 asmlinkage void ret_from_kernel_thread(void);
46 #include <asm/pgalloc.h>
48 void (*pm_power_off)(void);
49 EXPORT_SYMBOL(pm_power_off);
51 static void core_sleep_idle(void)
53 #ifdef LED_DEBUG_SLEEP
54 /* Show that we're sleeping... */
58 #ifdef LED_DEBUG_SLEEP
59 /* ... and that we woke up */
65 void arch_cpu_idle(void)
67 if (!frv_dma_inprogress)
73 void machine_restart(char * __unused)
75 unsigned long reset_addr;
80 if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
81 reset_addr = 0xfefff500;
83 reset_addr = 0xfeff0500;
86 asm volatile(" dcef @(gr0,gr0),1 ! membar !"
88 " nop ! nop ! nop ! nop ! nop ! "
89 " nop ! nop ! nop ! nop ! nop ! "
90 " nop ! nop ! nop ! nop ! nop ! "
91 " nop ! nop ! nop ! nop ! nop ! "
92 : : "r" (reset_addr), "r" (1) );
98 void machine_halt(void)
100 #ifdef CONFIG_GDBSTUB
107 void machine_power_off(void)
109 #ifdef CONFIG_GDBSTUB
116 void flush_thread(void)
121 inline unsigned long user_stack(const struct pt_regs *regs)
123 while (regs->next_frame)
124 regs = regs->next_frame;
125 return user_mode(regs) ? regs->sp : 0;
129 * set up the kernel stack and exception frames for a new process
131 int copy_thread(unsigned long clone_flags,
132 unsigned long usp, unsigned long arg,
133 struct task_struct *p)
135 struct pt_regs *childregs;
137 childregs = (struct pt_regs *)
138 (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
140 /* set up the userspace frame (the only place that the USP is stored) */
141 *childregs = *current_pt_regs();
143 p->thread.frame = childregs;
145 p->thread.sp = (unsigned long) childregs;
148 p->thread.frame0 = childregs;
150 if (unlikely(p->flags & PF_KTHREAD)) {
151 childregs->gr9 = usp; /* function */
152 childregs->gr8 = arg;
153 p->thread.pc = (unsigned long) ret_from_kernel_thread;
154 save_user_regs(p->thread.user);
159 childregs->next_frame = NULL;
161 p->thread.pc = (unsigned long) ret_from_fork;
163 /* the new TLS pointer is passed in as arg #5 to sys_clone() */
164 if (clone_flags & CLONE_SETTLS)
165 childregs->gr29 = childregs->gr12;
167 save_user_regs(p->thread.user);
170 } /* end copy_thread() */
172 unsigned long get_wchan(struct task_struct *p)
174 struct pt_regs *regs0;
175 unsigned long fp, pc;
176 unsigned long stack_limit;
178 if (!p || p == current || p->state == TASK_RUNNING)
181 stack_limit = (unsigned long) (p + 1);
183 regs0 = p->thread.frame0;
186 if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
189 pc = ((unsigned long *) fp)[2];
191 /* FIXME: This depends on the order of these functions. */
192 if (!in_sched_functions(pc))
195 fp = *(unsigned long *) fp;
196 } while (count++ < 16);
201 int elf_check_arch(const struct elf32_hdr *hdr)
203 unsigned long hsr0 = __get_HSR(0);
204 unsigned long psr = __get_PSR();
206 if (hdr->e_machine != EM_FRV)
209 switch (hdr->e_flags & EF_FRV_GPR_MASK) {
211 if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
220 switch (hdr->e_flags & EF_FRV_FPR_MASK) {
222 if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
225 case EF_FRV_FPR_NONE:
232 if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
233 if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
234 PSR_IMPLE(psr) != PSR_IMPLE_FR451)
237 switch (hdr->e_flags & EF_FRV_CPU_MASK) {
238 case EF_FRV_CPU_GENERIC:
240 case EF_FRV_CPU_FR300:
241 case EF_FRV_CPU_SIMPLE:
242 case EF_FRV_CPU_TOMCAT:
245 case EF_FRV_CPU_FR400:
246 if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
247 PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
248 PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
249 PSR_IMPLE(psr) != PSR_IMPLE_FR551)
252 case EF_FRV_CPU_FR450:
253 if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
256 case EF_FRV_CPU_FR500:
257 if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
260 case EF_FRV_CPU_FR550:
261 if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
269 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
272 ¤t->thread.user->f,
273 sizeof(current->thread.user->f));