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

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

Version: ~ [ linux-5.6-rc7 ] ~ [ linux-5.5.11 ] ~ [ linux-5.4.27 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.112 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ 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 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/sh/kernel/process.c
  4  *
  5  * This file handles the architecture-dependent parts of process handling..
  6  *
  7  *  Copyright (C) 1995  Linus Torvalds
  8  *
  9  *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 10  *                   Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
 11  *                   Copyright (C) 2002 - 2008  Paul Mundt
 12  */
 13 #include <linux/module.h>
 14 #include <linux/mm.h>
 15 #include <linux/sched/debug.h>
 16 #include <linux/sched/task.h>
 17 #include <linux/sched/task_stack.h>
 18 #include <linux/slab.h>
 19 #include <linux/elfcore.h>
 20 #include <linux/fs.h>
 21 #include <linux/ftrace.h>
 22 #include <linux/hw_breakpoint.h>
 23 #include <linux/prefetch.h>
 24 #include <linux/stackprotector.h>
 25 #include <linux/uaccess.h>
 26 #include <asm/mmu_context.h>
 27 #include <asm/fpu.h>
 28 #include <asm/syscalls.h>
 29 #include <asm/switch_to.h>
 30 
 31 void show_regs(struct pt_regs * regs)
 32 {
 33         printk("\n");
 34         show_regs_print_info(KERN_DEFAULT);
 35 
 36         printk("PC is at %pS\n", (void *)instruction_pointer(regs));
 37         printk("PR is at %pS\n", (void *)regs->pr);
 38 
 39         printk("PC  : %08lx SP  : %08lx SR  : %08lx ",
 40                regs->pc, regs->regs[15], regs->sr);
 41 #ifdef CONFIG_MMU
 42         printk("TEA : %08x\n", __raw_readl(MMU_TEA));
 43 #else
 44         printk("\n");
 45 #endif
 46 
 47         printk("R0  : %08lx R1  : %08lx R2  : %08lx R3  : %08lx\n",
 48                regs->regs[0],regs->regs[1],
 49                regs->regs[2],regs->regs[3]);
 50         printk("R4  : %08lx R5  : %08lx R6  : %08lx R7  : %08lx\n",
 51                regs->regs[4],regs->regs[5],
 52                regs->regs[6],regs->regs[7]);
 53         printk("R8  : %08lx R9  : %08lx R10 : %08lx R11 : %08lx\n",
 54                regs->regs[8],regs->regs[9],
 55                regs->regs[10],regs->regs[11]);
 56         printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
 57                regs->regs[12],regs->regs[13],
 58                regs->regs[14]);
 59         printk("MACH: %08lx MACL: %08lx GBR : %08lx PR  : %08lx\n",
 60                regs->mach, regs->macl, regs->gbr, regs->pr);
 61 
 62         show_trace(NULL, (unsigned long *)regs->regs[15], regs);
 63         show_code(regs);
 64 }
 65 
 66 void start_thread(struct pt_regs *regs, unsigned long new_pc,
 67                   unsigned long new_sp)
 68 {
 69         regs->pr = 0;
 70         regs->sr = SR_FD;
 71         regs->pc = new_pc;
 72         regs->regs[15] = new_sp;
 73 
 74         free_thread_xstate(current);
 75 }
 76 EXPORT_SYMBOL(start_thread);
 77 
 78 void flush_thread(void)
 79 {
 80         struct task_struct *tsk = current;
 81 
 82         flush_ptrace_hw_breakpoint(tsk);
 83 
 84 #if defined(CONFIG_SH_FPU)
 85         /* Forget lazy FPU state */
 86         clear_fpu(tsk, task_pt_regs(tsk));
 87         clear_used_math();
 88 #endif
 89 }
 90 
 91 void release_thread(struct task_struct *dead_task)
 92 {
 93         /* do nothing */
 94 }
 95 
 96 /* Fill in the fpu structure for a core dump.. */
 97 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 98 {
 99         int fpvalid = 0;
100 
101 #if defined(CONFIG_SH_FPU)
102         struct task_struct *tsk = current;
103 
104         fpvalid = !!tsk_used_math(tsk);
105         if (fpvalid)
106                 fpvalid = !fpregs_get(tsk, NULL, 0,
107                                       sizeof(struct user_fpu_struct),
108                                       fpu, NULL);
109 #endif
110 
111         return fpvalid;
112 }
113 EXPORT_SYMBOL(dump_fpu);
114 
115 asmlinkage void ret_from_fork(void);
116 asmlinkage void ret_from_kernel_thread(void);
117 
118 int copy_thread(unsigned long clone_flags, unsigned long usp,
119                 unsigned long arg, struct task_struct *p)
120 {
121         struct thread_info *ti = task_thread_info(p);
122         struct pt_regs *childregs;
123 
124 #if defined(CONFIG_SH_DSP)
125         struct task_struct *tsk = current;
126 
127         if (is_dsp_enabled(tsk)) {
128                 /* We can use the __save_dsp or just copy the struct:
129                  * __save_dsp(p);
130                  * p->thread.dsp_status.status |= SR_DSP
131                  */
132                 p->thread.dsp_status = tsk->thread.dsp_status;
133         }
134 #endif
135 
136         memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
137 
138         childregs = task_pt_regs(p);
139         p->thread.sp = (unsigned long) childregs;
140         if (unlikely(p->flags & PF_KTHREAD)) {
141                 memset(childregs, 0, sizeof(struct pt_regs));
142                 p->thread.pc = (unsigned long) ret_from_kernel_thread;
143                 childregs->regs[4] = arg;
144                 childregs->regs[5] = usp;
145                 childregs->sr = SR_MD;
146 #if defined(CONFIG_SH_FPU)
147                 childregs->sr |= SR_FD;
148 #endif
149                 ti->addr_limit = KERNEL_DS;
150                 ti->status &= ~TS_USEDFPU;
151                 p->thread.fpu_counter = 0;
152                 return 0;
153         }
154         *childregs = *current_pt_regs();
155 
156         if (usp)
157                 childregs->regs[15] = usp;
158         ti->addr_limit = USER_DS;
159 
160         if (clone_flags & CLONE_SETTLS)
161                 childregs->gbr = childregs->regs[0];
162 
163         childregs->regs[0] = 0; /* Set return value for child */
164         p->thread.pc = (unsigned long) ret_from_fork;
165         return 0;
166 }
167 
168 /*
169  *      switch_to(x,y) should switch tasks from x to y.
170  *
171  */
172 __notrace_funcgraph struct task_struct *
173 __switch_to(struct task_struct *prev, struct task_struct *next)
174 {
175         struct thread_struct *next_t = &next->thread;
176 
177 #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
178         __stack_chk_guard = next->stack_canary;
179 #endif
180 
181         unlazy_fpu(prev, task_pt_regs(prev));
182 
183         /* we're going to use this soon, after a few expensive things */
184         if (next->thread.fpu_counter > 5)
185                 prefetch(next_t->xstate);
186 
187 #ifdef CONFIG_MMU
188         /*
189          * Restore the kernel mode register
190          *      k7 (r7_bank1)
191          */
192         asm volatile("ldc       %0, r7_bank"
193                      : /* no output */
194                      : "r" (task_thread_info(next)));
195 #endif
196 
197         /*
198          * If the task has used fpu the last 5 timeslices, just do a full
199          * restore of the math state immediately to avoid the trap; the
200          * chances of needing FPU soon are obviously high now
201          */
202         if (next->thread.fpu_counter > 5)
203                 __fpu_state_restore();
204 
205         return prev;
206 }
207 
208 unsigned long get_wchan(struct task_struct *p)
209 {
210         unsigned long pc;
211 
212         if (!p || p == current || p->state == TASK_RUNNING)
213                 return 0;
214 
215         /*
216          * The same comment as on the Alpha applies here, too ...
217          */
218         pc = thread_saved_pc(p);
219 
220 #ifdef CONFIG_FRAME_POINTER
221         if (in_sched_functions(pc)) {
222                 unsigned long schedule_frame = (unsigned long)p->thread.sp;
223                 return ((unsigned long *)schedule_frame)[21];
224         }
225 #endif
226 
227         return pc;
228 }
229 

~ [ 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