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/kernel.h>
19 #include <linux/smp.h>
20 #include <linux/stddef.h>
21 #include <linux/unistd.h>
22 #include <linux/ptrace.h>
23 #include <linux/slab.h>
24 #include <linux/user.h>
25 #include <linux/elf.h>
26 #include <linux/reboot.h>
27 #include <linux/interrupt.h>
28 #include <linux/pagemap.h>
29 #include <linux/rcupdate.h>
31 #include <asm/asm-offsets.h>
32 #include <linux/uaccess.h>
33 #include <asm/setup.h>
34 #include <asm/pgtable.h>
36 #include <asm/gdb-stub.h>
37 #include <asm/mb-regs.h>
41 asmlinkage void ret_from_fork(void);
42 asmlinkage void ret_from_kernel_thread(void);
44 #include <asm/pgalloc.h>
46 void (*pm_power_off)(void);
47 EXPORT_SYMBOL(pm_power_off);
49 static void core_sleep_idle(void)
51 #ifdef LED_DEBUG_SLEEP
52 /* Show that we're sleeping... */
56 #ifdef LED_DEBUG_SLEEP
57 /* ... and that we woke up */
63 void arch_cpu_idle(void)
65 if (!frv_dma_inprogress)
71 void machine_restart(char * __unused)
73 unsigned long reset_addr;
78 if (PSR_IMPLE(__get_PSR()) == PSR_IMPLE_FR551)
79 reset_addr = 0xfefff500;
81 reset_addr = 0xfeff0500;
84 asm volatile(" dcef @(gr0,gr0),1 ! membar !"
86 " nop ! nop ! nop ! nop ! nop ! "
87 " nop ! nop ! nop ! nop ! nop ! "
88 " nop ! nop ! nop ! nop ! nop ! "
89 " nop ! nop ! nop ! nop ! nop ! "
90 : : "r" (reset_addr), "r" (1) );
96 void machine_halt(void)
105 void machine_power_off(void)
107 #ifdef CONFIG_GDBSTUB
114 void flush_thread(void)
119 inline unsigned long user_stack(const struct pt_regs *regs)
121 while (regs->next_frame)
122 regs = regs->next_frame;
123 return user_mode(regs) ? regs->sp : 0;
127 * set up the kernel stack and exception frames for a new process
129 int copy_thread(unsigned long clone_flags,
130 unsigned long usp, unsigned long arg,
131 struct task_struct *p)
133 struct pt_regs *childregs;
135 childregs = (struct pt_regs *)
136 (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
138 /* set up the userspace frame (the only place that the USP is stored) */
139 *childregs = *current_pt_regs();
141 p->thread.frame = childregs;
143 p->thread.sp = (unsigned long) childregs;
146 p->thread.frame0 = childregs;
148 if (unlikely(p->flags & PF_KTHREAD)) {
149 childregs->gr9 = usp; /* function */
150 childregs->gr8 = arg;
151 p->thread.pc = (unsigned long) ret_from_kernel_thread;
152 save_user_regs(p->thread.user);
157 childregs->next_frame = NULL;
159 p->thread.pc = (unsigned long) ret_from_fork;
161 /* the new TLS pointer is passed in as arg #5 to sys_clone() */
162 if (clone_flags & CLONE_SETTLS)
163 childregs->gr29 = childregs->gr12;
165 save_user_regs(p->thread.user);
168 } /* end copy_thread() */
170 unsigned long get_wchan(struct task_struct *p)
172 struct pt_regs *regs0;
173 unsigned long fp, pc;
174 unsigned long stack_limit;
176 if (!p || p == current || p->state == TASK_RUNNING)
179 stack_limit = (unsigned long) (p + 1);
181 regs0 = p->thread.frame0;
184 if (fp < stack_limit || fp >= (unsigned long) regs0 || fp & 3)
187 pc = ((unsigned long *) fp)[2];
189 /* FIXME: This depends on the order of these functions. */
190 if (!in_sched_functions(pc))
193 fp = *(unsigned long *) fp;
194 } while (count++ < 16);
199 unsigned long thread_saved_pc(struct task_struct *tsk)
201 /* Check whether the thread is blocked in resume() */
202 if (in_sched_functions(tsk->thread.pc))
203 return ((unsigned long *)tsk->thread.fp)[2];
205 return tsk->thread.pc;
208 int elf_check_arch(const struct elf32_hdr *hdr)
210 unsigned long hsr0 = __get_HSR(0);
211 unsigned long psr = __get_PSR();
213 if (hdr->e_machine != EM_FRV)
216 switch (hdr->e_flags & EF_FRV_GPR_MASK) {
218 if ((hsr0 & HSR0_GRN) == HSR0_GRN_32)
227 switch (hdr->e_flags & EF_FRV_FPR_MASK) {
229 if ((hsr0 & HSR0_FRN) == HSR0_FRN_32)
232 case EF_FRV_FPR_NONE:
239 if ((hdr->e_flags & EF_FRV_MULADD) == EF_FRV_MULADD)
240 if (PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
241 PSR_IMPLE(psr) != PSR_IMPLE_FR451)
244 switch (hdr->e_flags & EF_FRV_CPU_MASK) {
245 case EF_FRV_CPU_GENERIC:
247 case EF_FRV_CPU_FR300:
248 case EF_FRV_CPU_SIMPLE:
249 case EF_FRV_CPU_TOMCAT:
252 case EF_FRV_CPU_FR400:
253 if (PSR_IMPLE(psr) != PSR_IMPLE_FR401 &&
254 PSR_IMPLE(psr) != PSR_IMPLE_FR405 &&
255 PSR_IMPLE(psr) != PSR_IMPLE_FR451 &&
256 PSR_IMPLE(psr) != PSR_IMPLE_FR551)
259 case EF_FRV_CPU_FR450:
260 if (PSR_IMPLE(psr) != PSR_IMPLE_FR451)
263 case EF_FRV_CPU_FR500:
264 if (PSR_IMPLE(psr) != PSR_IMPLE_FR501)
267 case EF_FRV_CPU_FR550:
268 if (PSR_IMPLE(psr) != PSR_IMPLE_FR551)
276 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
279 ¤t->thread.user->f,
280 sizeof(current->thread.user->f));