1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
>> 2 /*
>> 3 * linux/arch/m68k/kernel/process.c
>> 4 *
>> 5 * Copyright (C) 1995 Hamish Macdonald
>> 6 *
>> 7 * 68060 fixes by Jesper Skov
>> 8 */
2 9
3 /* 10 /*
4 * This file handles the architecture independ !! 11 * This file handles the architecture-dependent parts of process handling..
5 */ 12 */
6 13
7 #include <linux/compat.h> <<
8 #include <linux/errno.h> 14 #include <linux/errno.h>
9 #include <linux/kernel.h> !! 15 #include <linux/module.h>
10 #include <linux/ptrace.h> <<
11 #include <linux/sched.h> 16 #include <linux/sched.h>
>> 17 #include <linux/sched/debug.h>
12 #include <linux/sched/task.h> 18 #include <linux/sched/task.h>
13 #include <linux/sched/task_stack.h> 19 #include <linux/sched/task_stack.h>
14 #include <linux/signal.h> !! 20 #include <linux/kernel.h>
>> 21 #include <linux/mm.h>
>> 22 #include <linux/slab.h>
>> 23 #include <linux/fs.h>
>> 24 #include <linux/smp.h>
>> 25 #include <linux/stddef.h>
>> 26 #include <linux/unistd.h>
>> 27 #include <linux/ptrace.h>
>> 28 #include <linux/user.h>
>> 29 #include <linux/reboot.h>
>> 30 #include <linux/init_task.h>
>> 31 #include <linux/mqueue.h>
>> 32 #include <linux/rcupdate.h>
>> 33
>> 34 #include <linux/uaccess.h>
>> 35 #include <asm/traps.h>
>> 36 #include <asm/machdep.h>
>> 37 #include <asm/setup.h>
>> 38 #include <asm/pgtable.h>
15 39
16 #include "kernel.h" <<
17 40
18 asmlinkage long sparc_fork(struct pt_regs *reg !! 41 asmlinkage void ret_from_fork(void);
>> 42 asmlinkage void ret_from_kernel_thread(void);
>> 43
>> 44 void arch_cpu_idle(void)
19 { 45 {
20 unsigned long orig_i1 = regs->u_regs[U !! 46 #if defined(MACH_ATARI_ONLY)
21 long ret; !! 47 /* block out HSYNC on the atari (falcon) */
22 struct kernel_clone_args args = { !! 48 __asm__("stop #0x2200" : : : "cc");
23 .exit_signal = SIGCHLD, !! 49 #else
24 /* Reuse the parent's stack fo !! 50 __asm__("stop #0x2000" : : : "cc");
25 .stack = regs->u_regs !! 51 #endif
26 }; !! 52 }
27 <<
28 ret = kernel_clone(&args); <<
29 <<
30 /* If we get an error and potentially <<
31 * call, we're screwed because copy_th <<
32 * the parent's %o1. So detect that c <<
33 * here. <<
34 */ <<
35 if ((unsigned long)ret >= -ERESTART_RE <<
36 regs->u_regs[UREG_I1] = orig_i <<
37 53
38 return ret; !! 54 void machine_restart(char * __unused)
>> 55 {
>> 56 if (mach_reset)
>> 57 mach_reset();
>> 58 for (;;);
39 } 59 }
40 60
41 asmlinkage long sparc_vfork(struct pt_regs *re !! 61 void machine_halt(void)
42 { 62 {
43 unsigned long orig_i1 = regs->u_regs[U !! 63 if (mach_halt)
44 long ret; !! 64 mach_halt();
>> 65 for (;;);
>> 66 }
45 67
46 struct kernel_clone_args args = { !! 68 void machine_power_off(void)
47 .flags = CLONE_VFORK !! 69 {
48 .exit_signal = SIGCHLD, !! 70 if (mach_power_off)
49 /* Reuse the parent's stack fo !! 71 mach_power_off();
50 .stack = regs->u_regs !! 72 for (;;);
51 }; !! 73 }
52 74
53 ret = kernel_clone(&args); !! 75 void (*pm_power_off)(void) = machine_power_off;
>> 76 EXPORT_SYMBOL(pm_power_off);
>> 77
>> 78 void show_regs(struct pt_regs * regs)
>> 79 {
>> 80 pr_info("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
>> 81 regs->format, regs->vector, regs->pc, regs->sr,
>> 82 print_tainted());
>> 83 pr_info("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
>> 84 regs->orig_d0, regs->d0, regs->a2, regs->a1);
>> 85 pr_info("A0: %08lx D5: %08lx D4: %08lx\n", regs->a0, regs->d5,
>> 86 regs->d4);
>> 87 pr_info("D3: %08lx D2: %08lx D1: %08lx\n", regs->d3, regs->d2,
>> 88 regs->d1);
>> 89 if (!(regs->sr & PS_S))
>> 90 pr_info("USP: %08lx\n", rdusp());
>> 91 }
54 92
55 /* If we get an error and potentially !! 93 void flush_thread(void)
56 * call, we're screwed because copy_th !! 94 {
57 * the parent's %o1. So detect that c !! 95 current->thread.fs = __USER_DS;
58 * here. !! 96 #ifdef CONFIG_FPU
>> 97 if (!FPU_IS_EMU) {
>> 98 unsigned long zero = 0;
>> 99 asm volatile("frestore %0": :"m" (zero));
>> 100 }
>> 101 #endif
>> 102 }
>> 103
>> 104 /*
>> 105 * Why not generic sys_clone, you ask? m68k passes all arguments on stack.
>> 106 * And we need all registers saved, which means a bunch of stuff pushed
>> 107 * on top of pt_regs, which means that sys_clone() arguments would be
>> 108 * buried. We could, of course, copy them, but it's too costly for no
>> 109 * good reason - generic clone() would have to copy them *again* for
>> 110 * do_fork() anyway. So in this case it's actually better to pass pt_regs *
>> 111 * and extract arguments for do_fork() from there. Eventually we might
>> 112 * go for calling do_fork() directly from the wrapper, but only after we
>> 113 * are finished with do_fork() prototype conversion.
>> 114 */
>> 115 asmlinkage int m68k_clone(struct pt_regs *regs)
>> 116 {
>> 117 /* regs will be equal to current_pt_regs() */
>> 118 return do_fork(regs->d1, regs->d2, 0,
>> 119 (int __user *)regs->d3, (int __user *)regs->d4);
>> 120 }
>> 121
>> 122 int copy_thread(unsigned long clone_flags, unsigned long usp,
>> 123 unsigned long arg, struct task_struct *p)
>> 124 {
>> 125 struct fork_frame {
>> 126 struct switch_stack sw;
>> 127 struct pt_regs regs;
>> 128 } *frame;
>> 129
>> 130 frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
>> 131
>> 132 p->thread.ksp = (unsigned long)frame;
>> 133 p->thread.esp0 = (unsigned long)&frame->regs;
>> 134
>> 135 /*
>> 136 * Must save the current SFC/DFC value, NOT the value when
>> 137 * the parent was last descheduled - RGH 10-08-96
59 */ 138 */
60 if ((unsigned long)ret >= -ERESTART_RE !! 139 p->thread.fs = get_fs().seg;
61 regs->u_regs[UREG_I1] = orig_i !! 140
>> 141 if (unlikely(p->flags & PF_KTHREAD)) {
>> 142 /* kernel thread */
>> 143 memset(frame, 0, sizeof(struct fork_frame));
>> 144 frame->regs.sr = PS_S;
>> 145 frame->sw.a3 = usp; /* function */
>> 146 frame->sw.d7 = arg;
>> 147 frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
>> 148 p->thread.usp = 0;
>> 149 return 0;
>> 150 }
>> 151 memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
>> 152 sizeof(struct fork_frame));
>> 153 frame->regs.d0 = 0;
>> 154 frame->sw.retpc = (unsigned long)ret_from_fork;
>> 155 p->thread.usp = usp ?: rdusp();
>> 156
>> 157 if (clone_flags & CLONE_SETTLS)
>> 158 task_thread_info(p)->tp_value = frame->regs.d5;
>> 159
>> 160 #ifdef CONFIG_FPU
>> 161 if (!FPU_IS_EMU) {
>> 162 /* Copy the current fpu state */
>> 163 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
>> 164
>> 165 if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
>> 166 if (CPU_IS_COLDFIRE) {
>> 167 asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
>> 168 "fmovel %/fpiar,%1\n\t"
>> 169 "fmovel %/fpcr,%2\n\t"
>> 170 "fmovel %/fpsr,%3"
>> 171 :
>> 172 : "m" (p->thread.fp[0]),
>> 173 "m" (p->thread.fpcntl[0]),
>> 174 "m" (p->thread.fpcntl[1]),
>> 175 "m" (p->thread.fpcntl[2])
>> 176 : "memory");
>> 177 } else {
>> 178 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
>> 179 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
>> 180 :
>> 181 : "m" (p->thread.fp[0]),
>> 182 "m" (p->thread.fpcntl[0])
>> 183 : "memory");
>> 184 }
>> 185 }
>> 186
>> 187 /* Restore the state in case the fpu was busy */
>> 188 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
>> 189 }
>> 190 #endif /* CONFIG_FPU */
62 191
63 return ret; !! 192 return 0;
64 } 193 }
65 194
66 asmlinkage long sparc_clone(struct pt_regs *re !! 195 /* Fill in the fpu structure for a core dump. */
>> 196 int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
67 { 197 {
68 unsigned long orig_i1 = regs->u_regs[U !! 198 if (FPU_IS_EMU) {
69 unsigned int flags = lower_32_bits(reg !! 199 int i;
70 long ret; !! 200
71 !! 201 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
72 struct kernel_clone_args args = { !! 202 memcpy(fpu->fpregs, current->thread.fp, 96);
73 .flags = (flags & ~CS !! 203 /* Convert internal fpu reg representation
74 .exit_signal = (flags & CSI !! 204 * into long double format
75 .tls = regs->u_regs !! 205 */
76 }; !! 206 for (i = 0; i < 24; i += 3)
77 !! 207 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
78 #ifdef CONFIG_COMPAT !! 208 ((fpu->fpregs[i] & 0x0000ffff) << 16);
79 if (test_thread_flag(TIF_32BIT)) { !! 209 return 1;
80 args.pidfd = compat_ptr(r <<
81 args.child_tid = compat_ptr(r <<
82 args.parent_tid = compat_ptr(r <<
83 } else <<
84 #endif <<
85 { <<
86 args.pidfd = (int __user <<
87 args.child_tid = (int __user <<
88 args.parent_tid = (int __user <<
89 } 210 }
90 211
91 /* Did userspace give setup a separate !! 212 if (IS_ENABLED(CONFIG_FPU)) {
92 * reusing the parent's? !! 213 char fpustate[216];
93 */ <<
94 if (regs->u_regs[UREG_I1]) <<
95 args.stack = regs->u_regs[UREG <<
96 else <<
97 args.stack = regs->u_regs[UREG <<
98 <<
99 ret = kernel_clone(&args); <<
100 <<
101 /* If we get an error and potentially <<
102 * call, we're screwed because copy_th <<
103 * the parent's %o1. So detect that c <<
104 * here. <<
105 */ <<
106 if ((unsigned long)ret >= -ERESTART_RE <<
107 regs->u_regs[UREG_I1] = orig_i <<
108 214
109 return ret; !! 215 /* First dump the fpu context to avoid protocol violation. */
>> 216 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
>> 217 if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
>> 218 return 0;
>> 219
>> 220 if (CPU_IS_COLDFIRE) {
>> 221 asm volatile ("fmovel %/fpiar,%0\n\t"
>> 222 "fmovel %/fpcr,%1\n\t"
>> 223 "fmovel %/fpsr,%2\n\t"
>> 224 "fmovemd %/fp0-%/fp7,%3"
>> 225 :
>> 226 : "m" (fpu->fpcntl[0]),
>> 227 "m" (fpu->fpcntl[1]),
>> 228 "m" (fpu->fpcntl[2]),
>> 229 "m" (fpu->fpregs[0])
>> 230 : "memory");
>> 231 } else {
>> 232 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
>> 233 :
>> 234 : "m" (fpu->fpcntl[0])
>> 235 : "memory");
>> 236 asm volatile ("fmovemx %/fp0-%/fp7,%0"
>> 237 :
>> 238 : "m" (fpu->fpregs[0])
>> 239 : "memory");
>> 240 }
>> 241 }
>> 242
>> 243 return 1;
>> 244 }
>> 245 EXPORT_SYMBOL(dump_fpu);
>> 246
>> 247 unsigned long get_wchan(struct task_struct *p)
>> 248 {
>> 249 unsigned long fp, pc;
>> 250 unsigned long stack_page;
>> 251 int count = 0;
>> 252 if (!p || p == current || p->state == TASK_RUNNING)
>> 253 return 0;
>> 254
>> 255 stack_page = (unsigned long)task_stack_page(p);
>> 256 fp = ((struct switch_stack *)p->thread.ksp)->a6;
>> 257 do {
>> 258 if (fp < stack_page+sizeof(struct thread_info) ||
>> 259 fp >= 8184+stack_page)
>> 260 return 0;
>> 261 pc = ((unsigned long *)fp)[1];
>> 262 if (!in_sched_functions(pc))
>> 263 return pc;
>> 264 fp = *(unsigned long *) fp;
>> 265 } while (count++ < 16);
>> 266 return 0;
110 } 267 }
111 268
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