~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/sh/kernel/process_32.c

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * arch/sh/kernel/process.c
  3  *
  4  * This file handles the architecture-dependent parts of process handling..
  5  *
  6  *  Copyright (C) 1995  Linus Torvalds
  7  *
  8  *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
  9  *                   Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
 10  *                   Copyright (C) 2002 - 2008  Paul Mundt
 11  *
 12  * This file is subject to the terms and conditions of the GNU General Public
 13  * License.  See the file "COPYING" in the main directory of this archive
 14  * for more details.
 15  */
 16 #include <linux/module.h>
 17 #include <linux/mm.h>
 18 #include <linux/sched/debug.h>
 19 #include <linux/sched/task.h>
 20 #include <linux/sched/task_stack.h>
 21 #include <linux/slab.h>
 22 #include <linux/elfcore.h>
 23 #include <linux/fs.h>
 24 #include <linux/ftrace.h>
 25 #include <linux/hw_breakpoint.h>
 26 #include <linux/prefetch.h>
 27 #include <linux/stackprotector.h>
 28 #include <linux/uaccess.h>
 29 #include <asm/mmu_context.h>
 30 #include <asm/fpu.h>
 31 #include <asm/syscalls.h>
 32 #include <asm/switch_to.h>
 33 
 34 void show_regs(struct pt_regs * regs)
 35 {
 36         printk("\n");
 37         show_regs_print_info(KERN_DEFAULT);
 38 
 39         printk("PC is at %pS\n", (void *)instruction_pointer(regs));
 40         printk("PR is at %pS\n", (void *)regs->pr);
 41 
 42         printk("PC  : %08lx SP  : %08lx SR  : %08lx ",
 43                regs->pc, regs->regs[15], regs->sr);
 44 #ifdef CONFIG_MMU
 45         printk("TEA : %08x\n", __raw_readl(MMU_TEA));
 46 #else
 47         printk("\n");
 48 #endif
 49 
 50         printk("R0  : %08lx R1  : %08lx R2  : %08lx R3  : %08lx\n",
 51                regs->regs[0],regs->regs[1],
 52                regs->regs[2],regs->regs[3]);
 53         printk("R4  : %08lx R5  : %08lx R6  : %08lx R7  : %08lx\n",
 54                regs->regs[4],regs->regs[5],
 55                regs->regs[6],regs->regs[7]);
 56         printk("R8  : %08lx R9  : %08lx R10 : %08lx R11 : %08lx\n",
 57                regs->regs[8],regs->regs[9],
 58                regs->regs[10],regs->regs[11]);
 59         printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
 60                regs->regs[12],regs->regs[13],
 61                regs->regs[14]);
 62         printk("MACH: %08lx MACL: %08lx GBR : %08lx PR  : %08lx\n",
 63                regs->mach, regs->macl, regs->gbr, regs->pr);
 64 
 65         show_trace(NULL, (unsigned long *)regs->regs[15], regs);
 66         show_code(regs);
 67 }
 68 
 69 void start_thread(struct pt_regs *regs, unsigned long new_pc,
 70                   unsigned long new_sp)
 71 {
 72         regs->pr = 0;
 73         regs->sr = SR_FD;
 74         regs->pc = new_pc;
 75         regs->regs[15] = new_sp;
 76 
 77         free_thread_xstate(current);
 78 }
 79 EXPORT_SYMBOL(start_thread);
 80 
 81 void flush_thread(void)
 82 {
 83         struct task_struct *tsk = current;
 84 
 85         flush_ptrace_hw_breakpoint(tsk);
 86 
 87 #if defined(CONFIG_SH_FPU)
 88         /* Forget lazy FPU state */
 89         clear_fpu(tsk, task_pt_regs(tsk));
 90         clear_used_math();
 91 #endif
 92 }
 93 
 94 void release_thread(struct task_struct *dead_task)
 95 {
 96         /* do nothing */
 97 }
 98 
 99 /* Fill in the fpu structure for a core dump.. */
100 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
101 {
102         int fpvalid = 0;
103 
104 #if defined(CONFIG_SH_FPU)
105         struct task_struct *tsk = current;
106 
107         fpvalid = !!tsk_used_math(tsk);
108         if (fpvalid)
109                 fpvalid = !fpregs_get(tsk, NULL, 0,
110                                       sizeof(struct user_fpu_struct),
111                                       fpu, NULL);
112 #endif
113 
114         return fpvalid;
115 }
116 EXPORT_SYMBOL(dump_fpu);
117 
118 asmlinkage void ret_from_fork(void);
119 asmlinkage void ret_from_kernel_thread(void);
120 
121 int copy_thread(unsigned long clone_flags, unsigned long usp,
122                 unsigned long arg, struct task_struct *p)
123 {
124         struct thread_info *ti = task_thread_info(p);
125         struct pt_regs *childregs;
126 
127 #if defined(CONFIG_SH_DSP)
128         struct task_struct *tsk = current;
129 
130         if (is_dsp_enabled(tsk)) {
131                 /* We can use the __save_dsp or just copy the struct:
132                  * __save_dsp(p);
133                  * p->thread.dsp_status.status |= SR_DSP
134                  */
135                 p->thread.dsp_status = tsk->thread.dsp_status;
136         }
137 #endif
138 
139         memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
140 
141         childregs = task_pt_regs(p);
142         p->thread.sp = (unsigned long) childregs;
143         if (unlikely(p->flags & PF_KTHREAD)) {
144                 memset(childregs, 0, sizeof(struct pt_regs));
145                 p->thread.pc = (unsigned long) ret_from_kernel_thread;
146                 childregs->regs[4] = arg;
147                 childregs->regs[5] = usp;
148                 childregs->sr = SR_MD;
149 #if defined(CONFIG_SH_FPU)
150                 childregs->sr |= SR_FD;
151 #endif
152                 ti->addr_limit = KERNEL_DS;
153                 ti->status &= ~TS_USEDFPU;
154                 p->thread.fpu_counter = 0;
155                 return 0;
156         }
157         *childregs = *current_pt_regs();
158 
159         if (usp)
160                 childregs->regs[15] = usp;
161         ti->addr_limit = USER_DS;
162 
163         if (clone_flags & CLONE_SETTLS)
164                 childregs->gbr = childregs->regs[0];
165 
166         childregs->regs[0] = 0; /* Set return value for child */
167         p->thread.pc = (unsigned long) ret_from_fork;
168         return 0;
169 }
170 
171 /*
172  *      switch_to(x,y) should switch tasks from x to y.
173  *
174  */
175 __notrace_funcgraph struct task_struct *
176 __switch_to(struct task_struct *prev, struct task_struct *next)
177 {
178         struct thread_struct *next_t = &next->thread;
179 
180 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
181         __stack_chk_guard = next->stack_canary;
182 #endif
183 
184         unlazy_fpu(prev, task_pt_regs(prev));
185 
186         /* we're going to use this soon, after a few expensive things */
187         if (next->thread.fpu_counter > 5)
188                 prefetch(next_t->xstate);
189 
190 #ifdef CONFIG_MMU
191         /*
192          * Restore the kernel mode register
193          *      k7 (r7_bank1)
194          */
195         asm volatile("ldc       %0, r7_bank"
196                      : /* no output */
197                      : "r" (task_thread_info(next)));
198 #endif
199 
200         /*
201          * If the task has used fpu the last 5 timeslices, just do a full
202          * restore of the math state immediately to avoid the trap; the
203          * chances of needing FPU soon are obviously high now
204          */
205         if (next->thread.fpu_counter > 5)
206                 __fpu_state_restore();
207 
208         return prev;
209 }
210 
211 unsigned long get_wchan(struct task_struct *p)
212 {
213         unsigned long pc;
214 
215         if (!p || p == current || p->state == TASK_RUNNING)
216                 return 0;
217 
218         /*
219          * The same comment as on the Alpha applies here, too ...
220          */
221         pc = thread_saved_pc(p);
222 
223 #ifdef CONFIG_FRAME_POINTER
224         if (in_sched_functions(pc)) {
225                 unsigned long schedule_frame = (unsigned long)p->thread.sp;
226                 return ((unsigned long *)schedule_frame)[21];
227         }
228 #endif
229 
230         return pc;
231 }
232 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp