Commit | Line | Data |
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aec5e0e1 PM |
1 | /* |
2 | * arch/sh/kernel/process.c | |
1da177e4 | 3 | * |
aec5e0e1 | 4 | * This file handles the architecture-dependent parts of process handling.. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1995 Linus Torvalds | |
7 | * | |
8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
8ae91b9a | 9 | * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC |
e7ab3cd2 PM |
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. | |
1da177e4 | 15 | */ |
1da177e4 | 16 | #include <linux/module.h> |
1da177e4 | 17 | #include <linux/mm.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/elfcore.h> |
1da177e4 | 20 | #include <linux/kallsyms.h> |
e06c4e57 | 21 | #include <linux/fs.h> |
7816fecd | 22 | #include <linux/ftrace.h> |
09a07294 | 23 | #include <linux/hw_breakpoint.h> |
0f0ebd98 | 24 | #include <linux/prefetch.h> |
5d920bb9 | 25 | #include <linux/stackprotector.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/mmu_context.h> | |
9bbafce2 | 28 | #include <asm/fpu.h> |
fa43972f | 29 | #include <asm/syscalls.h> |
f03c4866 | 30 | #include <asm/switch_to.h> |
1da177e4 | 31 | |
1da177e4 LT |
32 | void show_regs(struct pt_regs * regs) |
33 | { | |
34 | printk("\n"); | |
75fd24c1 PM |
35 | printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm); |
36 | printk("CPU : %d \t\t%s (%s %.*s)\n\n", | |
7d96169c PM |
37 | smp_processor_id(), print_tainted(), init_utsname()->release, |
38 | (int)strcspn(init_utsname()->version, " "), | |
39 | init_utsname()->version); | |
40 | ||
6b002230 | 41 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
7d96169c PM |
42 | print_symbol("PR is at %s\n", regs->pr); |
43 | ||
1da177e4 LT |
44 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
45 | regs->pc, regs->regs[15], regs->sr); | |
46 | #ifdef CONFIG_MMU | |
9d56dd3b | 47 | printk("TEA : %08x\n", __raw_readl(MMU_TEA)); |
1da177e4 | 48 | #else |
7d96169c | 49 | printk("\n"); |
1da177e4 | 50 | #endif |
1da177e4 LT |
51 | |
52 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
53 | regs->regs[0],regs->regs[1], | |
54 | regs->regs[2],regs->regs[3]); | |
55 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
56 | regs->regs[4],regs->regs[5], | |
57 | regs->regs[6],regs->regs[7]); | |
58 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
59 | regs->regs[8],regs->regs[9], | |
60 | regs->regs[10],regs->regs[11]); | |
61 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
62 | regs->regs[12],regs->regs[13], | |
63 | regs->regs[14]); | |
64 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
65 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
66 | ||
6b002230 | 67 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
9cfc9a9b | 68 | show_code(regs); |
1da177e4 LT |
69 | } |
70 | ||
70e068ee PM |
71 | void start_thread(struct pt_regs *regs, unsigned long new_pc, |
72 | unsigned long new_sp) | |
73 | { | |
70e068ee PM |
74 | regs->pr = 0; |
75 | regs->sr = SR_FD; | |
76 | regs->pc = new_pc; | |
77 | regs->regs[15] = new_sp; | |
0ea820cf PM |
78 | |
79 | free_thread_xstate(current); | |
70e068ee PM |
80 | } |
81 | EXPORT_SYMBOL(start_thread); | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Free current thread data structures etc.. | |
85 | */ | |
86 | void exit_thread(void) | |
87 | { | |
1da177e4 LT |
88 | } |
89 | ||
90 | void flush_thread(void) | |
91 | { | |
1da177e4 | 92 | struct task_struct *tsk = current; |
09a07294 PM |
93 | |
94 | flush_ptrace_hw_breakpoint(tsk); | |
95 | ||
96 | #if defined(CONFIG_SH_FPU) | |
1da177e4 | 97 | /* Forget lazy FPU state */ |
3cf0f4ec | 98 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
99 | clear_used_math(); |
100 | #endif | |
101 | } | |
102 | ||
103 | void release_thread(struct task_struct *dead_task) | |
104 | { | |
105 | /* do nothing */ | |
106 | } | |
107 | ||
108 | /* Fill in the fpu structure for a core dump.. */ | |
109 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
110 | { | |
111 | int fpvalid = 0; | |
112 | ||
113 | #if defined(CONFIG_SH_FPU) | |
114 | struct task_struct *tsk = current; | |
115 | ||
116 | fpvalid = !!tsk_used_math(tsk); | |
e7ab3cd2 PM |
117 | if (fpvalid) |
118 | fpvalid = !fpregs_get(tsk, NULL, 0, | |
119 | sizeof(struct user_fpu_struct), | |
120 | fpu, NULL); | |
1da177e4 LT |
121 | #endif |
122 | ||
123 | return fpvalid; | |
124 | } | |
4c978ca3 | 125 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
126 | |
127 | asmlinkage void ret_from_fork(void); | |
7147e215 | 128 | asmlinkage void ret_from_kernel_thread(void); |
1da177e4 | 129 | |
6f2c55b8 | 130 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
afa86fc4 | 131 | unsigned long arg, struct task_struct *p) |
1da177e4 | 132 | { |
2991be72 | 133 | struct thread_info *ti = task_thread_info(p); |
1da177e4 | 134 | struct pt_regs *childregs; |
1da177e4 | 135 | |
d3ea9fa0 | 136 | #if defined(CONFIG_SH_DSP) |
1da177e4 LT |
137 | struct task_struct *tsk = current; |
138 | ||
01ab1039 MT |
139 | if (is_dsp_enabled(tsk)) { |
140 | /* We can use the __save_dsp or just copy the struct: | |
141 | * __save_dsp(p); | |
142 | * p->thread.dsp_status.status |= SR_DSP | |
143 | */ | |
144 | p->thread.dsp_status = tsk->thread.dsp_status; | |
145 | } | |
146 | #endif | |
147 | ||
7147e215 | 148 | memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); |
1da177e4 | 149 | |
7147e215 AV |
150 | childregs = task_pt_regs(p); |
151 | p->thread.sp = (unsigned long) childregs; | |
152 | if (unlikely(p->flags & PF_KTHREAD)) { | |
153 | memset(childregs, 0, sizeof(struct pt_regs)); | |
154 | p->thread.pc = (unsigned long) ret_from_kernel_thread; | |
155 | childregs->regs[4] = arg; | |
156 | childregs->regs[5] = usp; | |
157 | childregs->sr = SR_MD; | |
158 | #if defined(CONFIG_SH_FPU) | |
159 | childregs->sr |= SR_FD; | |
160 | #endif | |
2991be72 | 161 | ti->addr_limit = KERNEL_DS; |
d3ea9fa0 SM |
162 | ti->status &= ~TS_USEDFPU; |
163 | p->fpu_counter = 0; | |
7147e215 | 164 | return 0; |
1da177e4 | 165 | } |
0ad9513d | 166 | *childregs = *current_pt_regs(); |
7147e215 | 167 | |
0ad9513d AV |
168 | if (usp) |
169 | childregs->regs[15] = usp; | |
7147e215 | 170 | ti->addr_limit = USER_DS; |
aec5e0e1 | 171 | |
e6bcf562 | 172 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 173 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 174 | |
1da177e4 | 175 | childregs->regs[0] = 0; /* Set return value for child */ |
1da177e4 | 176 | p->thread.pc = (unsigned long) ret_from_fork; |
1da177e4 LT |
177 | return 0; |
178 | } | |
179 | ||
1da177e4 LT |
180 | /* |
181 | * switch_to(x,y) should switch tasks from x to y. | |
182 | * | |
183 | */ | |
7816fecd MF |
184 | __notrace_funcgraph struct task_struct * |
185 | __switch_to(struct task_struct *prev, struct task_struct *next) | |
1da177e4 | 186 | { |
a0458b07 GC |
187 | struct thread_struct *next_t = &next->thread; |
188 | ||
5d920bb9 FA |
189 | #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP) |
190 | __stack_chk_guard = next->stack_canary; | |
191 | #endif | |
192 | ||
3cf0f4ec | 193 | unlazy_fpu(prev, task_pt_regs(prev)); |
a0458b07 GC |
194 | |
195 | /* we're going to use this soon, after a few expensive things */ | |
196 | if (next->fpu_counter > 5) | |
0ea820cf | 197 | prefetch(next_t->xstate); |
1da177e4 | 198 | |
a2d1a5fa | 199 | #ifdef CONFIG_MMU |
1da177e4 LT |
200 | /* |
201 | * Restore the kernel mode register | |
aec5e0e1 | 202 | * k7 (r7_bank1) |
1da177e4 LT |
203 | */ |
204 | asm volatile("ldc %0, r7_bank" | |
205 | : /* no output */ | |
cafcfcaa | 206 | : "r" (task_thread_info(next))); |
a2d1a5fa | 207 | #endif |
1da177e4 | 208 | |
6ba65383 PM |
209 | /* |
210 | * If the task has used fpu the last 5 timeslices, just do a full | |
a0458b07 GC |
211 | * restore of the math state immediately to avoid the trap; the |
212 | * chances of needing FPU soon are obviously high now | |
213 | */ | |
6ba65383 | 214 | if (next->fpu_counter > 5) |
0ea820cf | 215 | __fpu_state_restore(); |
a0458b07 | 216 | |
1da177e4 LT |
217 | return prev; |
218 | } | |
219 | ||
1da177e4 LT |
220 | unsigned long get_wchan(struct task_struct *p) |
221 | { | |
1da177e4 LT |
222 | unsigned long pc; |
223 | ||
224 | if (!p || p == current || p->state == TASK_RUNNING) | |
225 | return 0; | |
226 | ||
227 | /* | |
228 | * The same comment as on the Alpha applies here, too ... | |
229 | */ | |
230 | pc = thread_saved_pc(p); | |
c64ac9f0 DM |
231 | |
232 | #ifdef CONFIG_FRAME_POINTER | |
1da177e4 | 233 | if (in_sched_functions(pc)) { |
c64ac9f0 | 234 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
b652c23c | 235 | return ((unsigned long *)schedule_frame)[21]; |
1da177e4 | 236 | } |
c64ac9f0 | 237 | #endif |
b652c23c | 238 | |
1da177e4 LT |
239 | return pc; |
240 | } |