2 * Copyright (C) 2005,2006,2007,2008,2009,2010,2011 Imagination Technologies
4 * This file contains the architecture-dependent parts of process handling.
8 #include <linux/errno.h>
9 #include <linux/export.h>
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
13 #include <linux/unistd.h>
14 #include <linux/ptrace.h>
15 #include <linux/user.h>
16 #include <linux/reboot.h>
17 #include <linux/elfcore.h>
19 #include <linux/tick.h>
20 #include <linux/slab.h>
21 #include <linux/mman.h>
23 #include <linux/syscalls.h>
24 #include <linux/uaccess.h>
25 #include <asm/core_reg.h>
26 #include <asm/user_gateway.h>
28 #include <asm/traps.h>
29 #include <asm/switch_to.h>
32 * Wait for the next interrupt and enable local interrupts
34 static inline void arch_idle(void)
39 * Quickly jump straight into the interrupt entry point without actually
40 * triggering an interrupt. When TXSTATI gets read the processor will
41 * block until an interrupt is triggered.
43 asm volatile (/* Switch into ISTAT mode */
45 /* Enable local interrupts */
48 * We can't directly "SWAP PC, PCX", so we swap via a
49 * temporary. Essentially we do:
50 * PCX_new = 1f (the place to continue execution)
53 "ADD %0, CPC0, #(1f-.)\n\t"
56 /* Continue execution here with interrupts enabled */
59 : "r" (get_trigger_mask()));
64 set_thread_flag(TIF_POLLING_NRFLAG
);
67 tick_nohz_idle_enter();
70 while (!need_resched()) {
72 * We need to disable interrupts here to ensure we don't
76 if (!need_resched()) {
77 #ifdef CONFIG_HOTPLUG_CPU
78 if (cpu_is_offline(smp_processor_id()))
88 tick_nohz_idle_exit();
89 schedule_preempt_disabled();
93 void (*pm_power_off
)(void);
94 EXPORT_SYMBOL(pm_power_off
);
96 void (*soc_restart
)(char *cmd
);
97 void (*soc_halt
)(void);
99 void machine_restart(char *cmd
)
103 hard_processor_halt(HALT_OK
);
106 void machine_halt(void)
111 hard_processor_halt(HALT_OK
);
114 void machine_power_off(void)
119 hard_processor_halt(HALT_OK
);
127 void show_regs(struct pt_regs
*regs
)
130 const char *AX0_names
[] = {"A0StP", "A0FrP"};
131 const char *AX1_names
[] = {"A1GbP", "A1LbP"};
133 const char *DX0_names
[] = {
144 const char *DX1_names
[] = {
155 pr_info(" pt_regs @ %p\n", regs
);
156 pr_info(" SaveMask = 0x%04hx\n", regs
->ctx
.SaveMask
);
157 pr_info(" Flags = 0x%04hx (%c%c%c%c)\n", regs
->ctx
.Flags
,
158 regs
->ctx
.Flags
& FLAG_Z
? 'Z' : 'z',
159 regs
->ctx
.Flags
& FLAG_N
? 'N' : 'n',
160 regs
->ctx
.Flags
& FLAG_O
? 'O' : 'o',
161 regs
->ctx
.Flags
& FLAG_C
? 'C' : 'c');
162 pr_info(" TXRPT = 0x%08x\n", regs
->ctx
.CurrRPT
);
163 pr_info(" PC = 0x%08x\n", regs
->ctx
.CurrPC
);
166 for (i
= 0; i
< 2; i
++) {
167 pr_info(" %s = 0x%08x ",
170 printk(" %s = 0x%08x\n",
175 if (regs
->ctx
.SaveMask
& TBICTX_XEXT_BIT
)
176 pr_warn(" Extended state present - AX2.[01] will be WRONG\n");
178 /* Special place with AXx.2 */
179 pr_info(" A0.2 = 0x%08x ",
180 regs
->ctx
.Ext
.AX2
.U0
);
181 printk(" A1.2 = 0x%08x\n",
182 regs
->ctx
.Ext
.AX2
.U1
);
184 /* 'extended' AX regs (nominally, just AXx.3) */
185 for (i
= 0; i
< (TBICTX_AX_REGS
- 3); i
++) {
186 pr_info(" A0.%d = 0x%08x ", i
+ 3, regs
->ctx
.AX3
[i
].U0
);
187 printk(" A1.%d = 0x%08x\n", i
+ 3, regs
->ctx
.AX3
[i
].U1
);
190 for (i
= 0; i
< 8; i
++) {
191 pr_info(" %s = 0x%08x ", DX0_names
[i
], regs
->ctx
.DX
[i
].U0
);
192 printk(" %s = 0x%08x\n", DX1_names
[i
], regs
->ctx
.DX
[i
].U1
);
195 show_trace(NULL
, (unsigned long *)regs
->ctx
.AX
[0].U0
, regs
);
198 int copy_thread(unsigned long clone_flags
, unsigned long usp
,
199 unsigned long arg
, struct task_struct
*tsk
)
201 struct pt_regs
*childregs
= task_pt_regs(tsk
);
202 void *kernel_context
= ((void *) childregs
+
203 sizeof(struct pt_regs
));
204 unsigned long global_base
;
206 BUG_ON(((unsigned long)childregs
) & 0x7);
207 BUG_ON(((unsigned long)kernel_context
) & 0x7);
209 memset(&tsk
->thread
.kernel_context
, 0,
210 sizeof(tsk
->thread
.kernel_context
));
212 tsk
->thread
.kernel_context
= __TBISwitchInit(kernel_context
,
216 if (unlikely(tsk
->flags
& PF_KTHREAD
)) {
218 * Make sure we don't leak any kernel data to child's regs
219 * if kernel thread becomes a userspace thread in the future
221 memset(childregs
, 0 , sizeof(struct pt_regs
));
223 global_base
= __core_reg_get(A1GbP
);
224 childregs
->ctx
.AX
[0].U1
= (unsigned long) global_base
;
225 childregs
->ctx
.AX
[0].U0
= (unsigned long) kernel_context
;
226 /* Set D1Ar1=arg and D1RtP=usp (fn) */
227 childregs
->ctx
.DX
[4].U1
= usp
;
228 childregs
->ctx
.DX
[3].U1
= arg
;
229 tsk
->thread
.int_depth
= 2;
233 * Get a pointer to where the new child's register block should have
235 * The Meta's stack grows upwards, and the context is the the first
236 * thing to be pushed by TBX (phew)
238 *childregs
= *current_pt_regs();
239 /* Set the correct stack for the clone mode */
241 childregs
->ctx
.AX
[0].U0
= ALIGN(usp
, 8);
242 tsk
->thread
.int_depth
= 1;
244 /* set return value for child process */
245 childregs
->ctx
.DX
[0].U0
= 0;
247 /* The TLS pointer is passed as an argument to sys_clone. */
248 if (clone_flags
& CLONE_SETTLS
)
249 tsk
->thread
.tls_ptr
=
250 (__force
void __user
*)childregs
->ctx
.DX
[1].U1
;
252 #ifdef CONFIG_METAG_FPU
253 if (tsk
->thread
.fpu_context
) {
254 struct meta_fpu_context
*ctx
;
256 ctx
= kmemdup(tsk
->thread
.fpu_context
,
257 sizeof(struct meta_fpu_context
), GFP_ATOMIC
);
258 tsk
->thread
.fpu_context
= ctx
;
262 #ifdef CONFIG_METAG_DSP
263 if (tsk
->thread
.dsp_context
) {
264 struct meta_ext_context
*ctx
;
267 ctx
= kmemdup(tsk
->thread
.dsp_context
,
268 sizeof(struct meta_ext_context
), GFP_ATOMIC
);
269 for (i
= 0; i
< 2; i
++)
270 ctx
->ram
[i
] = kmemdup(ctx
->ram
[i
], ctx
->ram_sz
[i
],
272 tsk
->thread
.dsp_context
= ctx
;
279 #ifdef CONFIG_METAG_FPU
280 static void alloc_fpu_context(struct thread_struct
*thread
)
282 thread
->fpu_context
= kzalloc(sizeof(struct meta_fpu_context
),
286 static void clear_fpu(struct thread_struct
*thread
)
288 thread
->user_flags
&= ~TBICTX_FPAC_BIT
;
289 kfree(thread
->fpu_context
);
290 thread
->fpu_context
= NULL
;
293 static void clear_fpu(struct thread_struct
*thread
)
298 #ifdef CONFIG_METAG_DSP
299 static void clear_dsp(struct thread_struct
*thread
)
301 if (thread
->dsp_context
) {
302 kfree(thread
->dsp_context
->ram
[0]);
303 kfree(thread
->dsp_context
->ram
[1]);
305 kfree(thread
->dsp_context
);
307 thread
->dsp_context
= NULL
;
310 __core_reg_set(D0
.8
, 0);
313 static void clear_dsp(struct thread_struct
*thread
)
318 struct task_struct
*__sched
__switch_to(struct task_struct
*prev
,
319 struct task_struct
*next
)
323 to
.Switch
.pCtx
= next
->thread
.kernel_context
;
324 to
.Switch
.pPara
= prev
;
326 #ifdef CONFIG_METAG_FPU
327 if (prev
->thread
.user_flags
& TBICTX_FPAC_BIT
) {
328 struct pt_regs
*regs
= task_pt_regs(prev
);
331 state
.Sig
.SaveMask
= prev
->thread
.user_flags
;
332 state
.Sig
.pCtx
= ®s
->ctx
;
334 if (!prev
->thread
.fpu_context
)
335 alloc_fpu_context(&prev
->thread
);
336 if (prev
->thread
.fpu_context
)
337 __TBICtxFPUSave(state
, prev
->thread
.fpu_context
);
340 * Force a restore of the FPU context next time this process is
343 if (prev
->thread
.fpu_context
)
344 prev
->thread
.fpu_context
->needs_restore
= true;
348 from
= __TBISwitch(to
, &prev
->thread
.kernel_context
);
350 /* Restore TLS pointer for this process. */
351 set_gateway_tls(current
->thread
.tls_ptr
);
353 return (struct task_struct
*) from
.Switch
.pPara
;
356 void flush_thread(void)
358 clear_fpu(¤t
->thread
);
359 clear_dsp(¤t
->thread
);
363 * Free current thread data structures etc.
365 void exit_thread(void)
367 clear_fpu(¤t
->thread
);
368 clear_dsp(¤t
->thread
);
371 /* TODO: figure out how to unwind the kernel stack here to figure out
372 * where we went to sleep. */
373 unsigned long get_wchan(struct task_struct
*p
)
378 int dump_fpu(struct pt_regs
*regs
, elf_fpregset_t
*fpu
)
380 /* Returning 0 indicates that the FPU state was not stored (as it was
385 #ifdef CONFIG_METAG_USER_TCM
387 #define ELF_MIN_ALIGN PAGE_SIZE
389 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
390 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
391 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
393 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
395 unsigned long __metag_elf_map(struct file
*filep
, unsigned long addr
,
396 struct elf_phdr
*eppnt
, int prot
, int type
,
397 unsigned long total_size
)
399 unsigned long map_addr
, size
;
400 unsigned long page_off
= ELF_PAGEOFFSET(eppnt
->p_vaddr
);
401 unsigned long raw_size
= eppnt
->p_filesz
+ page_off
;
402 unsigned long off
= eppnt
->p_offset
- page_off
;
403 unsigned int tcm_tag
;
404 addr
= ELF_PAGESTART(addr
);
405 size
= ELF_PAGEALIGN(raw_size
);
407 /* mmap() will return -EINVAL if given a zero size, but a
408 * segment with zero filesize is perfectly valid */
412 tcm_tag
= tcm_lookup_tag(addr
);
414 if (tcm_tag
!= TCM_INVALID_TAG
)
418 * total_size is the size of the ELF (interpreter) image.
419 * The _first_ mmap needs to know the full size, otherwise
420 * randomization might put this image into an overlapping
421 * position with the ELF binary image. (since size < total_size)
422 * So we first map the 'big' image - and unmap the remainder at
423 * the end. (which unmap is needed for ELF images with holes.)
426 total_size
= ELF_PAGEALIGN(total_size
);
427 map_addr
= vm_mmap(filep
, addr
, total_size
, prot
, type
, off
);
428 if (!BAD_ADDR(map_addr
))
429 vm_munmap(map_addr
+size
, total_size
-size
);
431 map_addr
= vm_mmap(filep
, addr
, size
, prot
, type
, off
);
433 if (!BAD_ADDR(map_addr
) && tcm_tag
!= TCM_INVALID_TAG
) {
434 struct tcm_allocation
*tcm
;
435 unsigned long tcm_addr
;
437 tcm
= kmalloc(sizeof(*tcm
), GFP_KERNEL
);
441 tcm_addr
= tcm_alloc(tcm_tag
, raw_size
);
442 if (tcm_addr
!= addr
) {
448 tcm
->addr
= tcm_addr
;
449 tcm
->size
= raw_size
;
451 list_add(&tcm
->list
, ¤t
->mm
->context
.tcm
);
453 eppnt
->p_vaddr
= map_addr
;
454 if (copy_from_user((void *) addr
, (void __user
*) map_addr
,
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