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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> |
7c0f6ba6 | 26 | #include <linux/uaccess.h> |
1da177e4 | 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"); | |
a43cb95d | 35 | show_regs_print_info(KERN_DEFAULT); |
7d96169c | 36 | |
6b002230 | 37 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
7d96169c PM |
38 | print_symbol("PR is at %s\n", regs->pr); |
39 | ||
1da177e4 LT |
40 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
41 | regs->pc, regs->regs[15], regs->sr); | |
42 | #ifdef CONFIG_MMU | |
9d56dd3b | 43 | printk("TEA : %08x\n", __raw_readl(MMU_TEA)); |
1da177e4 | 44 | #else |
7d96169c | 45 | printk("\n"); |
1da177e4 | 46 | #endif |
1da177e4 LT |
47 | |
48 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
49 | regs->regs[0],regs->regs[1], | |
50 | regs->regs[2],regs->regs[3]); | |
51 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
52 | regs->regs[4],regs->regs[5], | |
53 | regs->regs[6],regs->regs[7]); | |
54 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
55 | regs->regs[8],regs->regs[9], | |
56 | regs->regs[10],regs->regs[11]); | |
57 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
58 | regs->regs[12],regs->regs[13], | |
59 | regs->regs[14]); | |
60 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
61 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
62 | ||
6b002230 | 63 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
9cfc9a9b | 64 | show_code(regs); |
1da177e4 LT |
65 | } |
66 | ||
70e068ee PM |
67 | void start_thread(struct pt_regs *regs, unsigned long new_pc, |
68 | unsigned long new_sp) | |
69 | { | |
70e068ee PM |
70 | regs->pr = 0; |
71 | regs->sr = SR_FD; | |
72 | regs->pc = new_pc; | |
73 | regs->regs[15] = new_sp; | |
0ea820cf PM |
74 | |
75 | free_thread_xstate(current); | |
70e068ee PM |
76 | } |
77 | EXPORT_SYMBOL(start_thread); | |
78 | ||
1da177e4 LT |
79 | void flush_thread(void) |
80 | { | |
1da177e4 | 81 | struct task_struct *tsk = current; |
09a07294 PM |
82 | |
83 | flush_ptrace_hw_breakpoint(tsk); | |
84 | ||
85 | #if defined(CONFIG_SH_FPU) | |
1da177e4 | 86 | /* Forget lazy FPU state */ |
3cf0f4ec | 87 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
88 | clear_used_math(); |
89 | #endif | |
90 | } | |
91 | ||
92 | void release_thread(struct task_struct *dead_task) | |
93 | { | |
94 | /* do nothing */ | |
95 | } | |
96 | ||
97 | /* Fill in the fpu structure for a core dump.. */ | |
98 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
99 | { | |
100 | int fpvalid = 0; | |
101 | ||
102 | #if defined(CONFIG_SH_FPU) | |
103 | struct task_struct *tsk = current; | |
104 | ||
105 | fpvalid = !!tsk_used_math(tsk); | |
e7ab3cd2 PM |
106 | if (fpvalid) |
107 | fpvalid = !fpregs_get(tsk, NULL, 0, | |
108 | sizeof(struct user_fpu_struct), | |
109 | fpu, NULL); | |
1da177e4 LT |
110 | #endif |
111 | ||
112 | return fpvalid; | |
113 | } | |
4c978ca3 | 114 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
115 | |
116 | asmlinkage void ret_from_fork(void); | |
7147e215 | 117 | asmlinkage void ret_from_kernel_thread(void); |
1da177e4 | 118 | |
6f2c55b8 | 119 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
afa86fc4 | 120 | unsigned long arg, struct task_struct *p) |
1da177e4 | 121 | { |
2991be72 | 122 | struct thread_info *ti = task_thread_info(p); |
1da177e4 | 123 | struct pt_regs *childregs; |
1da177e4 | 124 | |
d3ea9fa0 | 125 | #if defined(CONFIG_SH_DSP) |
1da177e4 LT |
126 | struct task_struct *tsk = current; |
127 | ||
01ab1039 MT |
128 | if (is_dsp_enabled(tsk)) { |
129 | /* We can use the __save_dsp or just copy the struct: | |
130 | * __save_dsp(p); | |
131 | * p->thread.dsp_status.status |= SR_DSP | |
132 | */ | |
133 | p->thread.dsp_status = tsk->thread.dsp_status; | |
134 | } | |
135 | #endif | |
136 | ||
7147e215 | 137 | memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps)); |
1da177e4 | 138 | |
7147e215 AV |
139 | childregs = task_pt_regs(p); |
140 | p->thread.sp = (unsigned long) childregs; | |
141 | if (unlikely(p->flags & PF_KTHREAD)) { | |
142 | memset(childregs, 0, sizeof(struct pt_regs)); | |
143 | p->thread.pc = (unsigned long) ret_from_kernel_thread; | |
144 | childregs->regs[4] = arg; | |
145 | childregs->regs[5] = usp; | |
146 | childregs->sr = SR_MD; | |
147 | #if defined(CONFIG_SH_FPU) | |
148 | childregs->sr |= SR_FD; | |
149 | #endif | |
2991be72 | 150 | ti->addr_limit = KERNEL_DS; |
d3ea9fa0 | 151 | ti->status &= ~TS_USEDFPU; |
616c05d1 | 152 | p->thread.fpu_counter = 0; |
7147e215 | 153 | return 0; |
1da177e4 | 154 | } |
0ad9513d | 155 | *childregs = *current_pt_regs(); |
7147e215 | 156 | |
0ad9513d AV |
157 | if (usp) |
158 | childregs->regs[15] = usp; | |
7147e215 | 159 | ti->addr_limit = USER_DS; |
aec5e0e1 | 160 | |
e6bcf562 | 161 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 162 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 163 | |
1da177e4 | 164 | childregs->regs[0] = 0; /* Set return value for child */ |
1da177e4 | 165 | p->thread.pc = (unsigned long) ret_from_fork; |
1da177e4 LT |
166 | return 0; |
167 | } | |
168 | ||
1da177e4 LT |
169 | /* |
170 | * switch_to(x,y) should switch tasks from x to y. | |
171 | * | |
172 | */ | |
7816fecd MF |
173 | __notrace_funcgraph struct task_struct * |
174 | __switch_to(struct task_struct *prev, struct task_struct *next) | |
1da177e4 | 175 | { |
a0458b07 GC |
176 | struct thread_struct *next_t = &next->thread; |
177 | ||
5d920bb9 FA |
178 | #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP) |
179 | __stack_chk_guard = next->stack_canary; | |
180 | #endif | |
181 | ||
3cf0f4ec | 182 | unlazy_fpu(prev, task_pt_regs(prev)); |
a0458b07 GC |
183 | |
184 | /* we're going to use this soon, after a few expensive things */ | |
616c05d1 | 185 | if (next->thread.fpu_counter > 5) |
0ea820cf | 186 | prefetch(next_t->xstate); |
1da177e4 | 187 | |
a2d1a5fa | 188 | #ifdef CONFIG_MMU |
1da177e4 LT |
189 | /* |
190 | * Restore the kernel mode register | |
aec5e0e1 | 191 | * k7 (r7_bank1) |
1da177e4 LT |
192 | */ |
193 | asm volatile("ldc %0, r7_bank" | |
194 | : /* no output */ | |
cafcfcaa | 195 | : "r" (task_thread_info(next))); |
a2d1a5fa | 196 | #endif |
1da177e4 | 197 | |
6ba65383 PM |
198 | /* |
199 | * If the task has used fpu the last 5 timeslices, just do a full | |
a0458b07 GC |
200 | * restore of the math state immediately to avoid the trap; the |
201 | * chances of needing FPU soon are obviously high now | |
202 | */ | |
616c05d1 | 203 | if (next->thread.fpu_counter > 5) |
0ea820cf | 204 | __fpu_state_restore(); |
a0458b07 | 205 | |
1da177e4 LT |
206 | return prev; |
207 | } | |
208 | ||
1da177e4 LT |
209 | unsigned long get_wchan(struct task_struct *p) |
210 | { | |
1da177e4 LT |
211 | unsigned long pc; |
212 | ||
213 | if (!p || p == current || p->state == TASK_RUNNING) | |
214 | return 0; | |
215 | ||
216 | /* | |
217 | * The same comment as on the Alpha applies here, too ... | |
218 | */ | |
219 | pc = thread_saved_pc(p); | |
c64ac9f0 DM |
220 | |
221 | #ifdef CONFIG_FRAME_POINTER | |
1da177e4 | 222 | if (in_sched_functions(pc)) { |
c64ac9f0 | 223 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
b652c23c | 224 | return ((unsigned long *)schedule_frame)[21]; |
1da177e4 | 225 | } |
c64ac9f0 | 226 | #endif |
b652c23c | 227 | |
1da177e4 LT |
228 | return pc; |
229 | } |