PageRenderTime 38ms CodeModel.GetById 22ms app.highlight 13ms RepoModel.GetById 1ms app.codeStats 0ms

/arch/um/os-Linux/skas/mem.c

https://gitlab.com/tiler/tiler-omap4
C | 295 lines | 232 code | 47 blank | 16 comment | 36 complexity | 182590f82fad3d5726ed2750c22d6612 MD5 | raw file
  1/*
  2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3 * Licensed under the GPL
  4 */
  5
  6#include <stddef.h>
  7#include <unistd.h>
  8#include <errno.h>
  9#include <string.h>
 10#include <sys/mman.h>
 11#include "init.h"
 12#include "kern_constants.h"
 13#include "as-layout.h"
 14#include "mm_id.h"
 15#include "os.h"
 16#include "proc_mm.h"
 17#include "ptrace_user.h"
 18#include "registers.h"
 19#include "skas.h"
 20#include "user.h"
 21#include "sysdep/ptrace.h"
 22#include "sysdep/stub.h"
 23
 24extern unsigned long batch_syscall_stub, __syscall_stub_start;
 25
 26extern void wait_stub_done(int pid);
 27
 28static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
 29					      unsigned long *stack)
 30{
 31	if (stack == NULL) {
 32		stack = (unsigned long *) mm_idp->stack + 2;
 33		*stack = 0;
 34	}
 35	return stack;
 36}
 37
 38static unsigned long syscall_regs[MAX_REG_NR];
 39
 40static int __init init_syscall_regs(void)
 41{
 42	get_safe_registers(syscall_regs);
 43	syscall_regs[REGS_IP_INDEX] = STUB_CODE +
 44		((unsigned long) &batch_syscall_stub -
 45		 (unsigned long) &__syscall_stub_start);
 46	return 0;
 47}
 48
 49__initcall(init_syscall_regs);
 50
 51extern int proc_mm;
 52
 53int single_count = 0;
 54int multi_count = 0;
 55int multi_op_count = 0;
 56
 57static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 58{
 59	int n, i;
 60	long ret, offset;
 61	unsigned long * data;
 62	unsigned long * syscall;
 63	int err, pid = mm_idp->u.pid;
 64
 65	if (proc_mm)
 66		/* FIXME: Need to look up userspace_pid by cpu */
 67		pid = userspace_pid[0];
 68
 69	multi_count++;
 70
 71	n = ptrace_setregs(pid, syscall_regs);
 72	if (n < 0) {
 73		printk(UM_KERN_ERR "Registers - \n");
 74		for (i = 0; i < MAX_REG_NR; i++)
 75			printk(UM_KERN_ERR "\t%d\t0x%lx\n", i, syscall_regs[i]);
 76		panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
 77		      -n);
 78	}
 79
 80	err = ptrace(PTRACE_CONT, pid, 0, 0);
 81	if (err)
 82		panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
 83		      errno);
 84
 85	wait_stub_done(pid);
 86
 87	/*
 88	 * When the stub stops, we find the following values on the
 89	 * beginning of the stack:
 90	 * (long )return_value
 91	 * (long )offset to failed sycall-data (0, if no error)
 92	 */
 93	ret = *((unsigned long *) mm_idp->stack);
 94	offset = *((unsigned long *) mm_idp->stack + 1);
 95	if (offset) {
 96		data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
 97		printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
 98		       "data = %p\n", ret, offset, data);
 99		syscall = (unsigned long *)((unsigned long)data + data[0]);
100		printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, "
101		       "return value = 0x%lx, expected return value = 0x%lx\n",
102		       syscall[0], ret, syscall[7]);
103		printk(UM_KERN_ERR "    syscall parameters: "
104		       "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
105		       syscall[1], syscall[2], syscall[3],
106		       syscall[4], syscall[5], syscall[6]);
107		for (n = 1; n < data[0]/sizeof(long); n++) {
108			if (n == 1)
109				printk(UM_KERN_ERR "    additional syscall "
110				       "data:");
111			if (n % 4 == 1)
112				printk("\n" UM_KERN_ERR "      ");
113			printk("  0x%lx", data[n]);
114		}
115		if (n > 1)
116			printk("\n");
117	}
118	else ret = 0;
119
120	*addr = check_init_stack(mm_idp, NULL);
121
122	return ret;
123}
124
125long run_syscall_stub(struct mm_id * mm_idp, int syscall,
126		      unsigned long *args, long expected, void **addr,
127		      int done)
128{
129	unsigned long *stack = check_init_stack(mm_idp, *addr);
130
131	if (done && *addr == NULL)
132		single_count++;
133
134	*stack += sizeof(long);
135	stack += *stack / sizeof(long);
136
137	*stack++ = syscall;
138	*stack++ = args[0];
139	*stack++ = args[1];
140	*stack++ = args[2];
141	*stack++ = args[3];
142	*stack++ = args[4];
143	*stack++ = args[5];
144	*stack++ = expected;
145	*stack = 0;
146	multi_op_count++;
147
148	if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
149		     UM_KERN_PAGE_SIZE - 10 * sizeof(long))) {
150		*addr = stack;
151		return 0;
152	}
153
154	return do_syscall_stub(mm_idp, addr);
155}
156
157long syscall_stub_data(struct mm_id * mm_idp,
158		       unsigned long *data, int data_count,
159		       void **addr, void **stub_addr)
160{
161	unsigned long *stack;
162	int ret = 0;
163
164	/*
165	 * If *addr still is uninitialized, it *must* contain NULL.
166	 * Thus in this case do_syscall_stub correctly won't be called.
167	 */
168	if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
169	   UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
170		ret = do_syscall_stub(mm_idp, addr);
171		/* in case of error, don't overwrite data on stack */
172		if (ret)
173			return ret;
174	}
175
176	stack = check_init_stack(mm_idp, *addr);
177	*addr = stack;
178
179	*stack = data_count * sizeof(long);
180
181	memcpy(stack + 1, data, data_count * sizeof(long));
182
183	*stub_addr = (void *)(((unsigned long)(stack + 1) &
184			       ~UM_KERN_PAGE_MASK) + STUB_DATA);
185
186	return 0;
187}
188
189int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
190	int phys_fd, unsigned long long offset, int done, void **data)
191{
192	int ret;
193
194	if (proc_mm) {
195		struct proc_mm_op map;
196		int fd = mm_idp->u.mm_fd;
197
198		map = ((struct proc_mm_op) { .op	= MM_MMAP,
199				       .u		=
200				       { .mmap	=
201					 { .addr	= virt,
202					   .len	= len,
203					   .prot	= prot,
204					   .flags	= MAP_SHARED |
205					   MAP_FIXED,
206					   .fd	= phys_fd,
207					   .offset= offset
208					 } } } );
209		CATCH_EINTR(ret = write(fd, &map, sizeof(map)));
210		if (ret != sizeof(map)) {
211			ret = -errno;
212			printk(UM_KERN_ERR "map : /proc/mm map failed, "
213			       "err = %d\n", -ret);
214		}
215		else ret = 0;
216	}
217	else {
218		unsigned long args[] = { virt, len, prot,
219					 MAP_SHARED | MAP_FIXED, phys_fd,
220					 MMAP_OFFSET(offset) };
221
222		ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
223				       data, done);
224	}
225
226	return ret;
227}
228
229int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
230	  int done, void **data)
231{
232	int ret;
233
234	if (proc_mm) {
235		struct proc_mm_op unmap;
236		int fd = mm_idp->u.mm_fd;
237
238		unmap = ((struct proc_mm_op) { .op	= MM_MUNMAP,
239					 .u	=
240					 { .munmap	=
241					   { .addr	=
242					     (unsigned long) addr,
243					     .len		= len } } } );
244		CATCH_EINTR(ret = write(fd, &unmap, sizeof(unmap)));
245		if (ret != sizeof(unmap)) {
246			ret = -errno;
247			printk(UM_KERN_ERR "unmap - proc_mm write returned "
248			       "%d\n", ret);
249		}
250		else ret = 0;
251	}
252	else {
253		unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
254					 0 };
255
256		ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
257				       data, done);
258	}
259
260	return ret;
261}
262
263int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
264	    unsigned int prot, int done, void **data)
265{
266	struct proc_mm_op protect;
267	int ret;
268
269	if (proc_mm) {
270		int fd = mm_idp->u.mm_fd;
271
272		protect = ((struct proc_mm_op) { .op	= MM_MPROTECT,
273					   .u	=
274					   { .mprotect	=
275					     { .addr	=
276					       (unsigned long) addr,
277					       .len	= len,
278					       .prot	= prot } } } );
279
280		CATCH_EINTR(ret = write(fd, &protect, sizeof(protect)));
281		if (ret != sizeof(protect)) {
282			ret = -errno;
283			printk(UM_KERN_ERR "protect failed, err = %d", -ret);
284		}
285		else ret = 0;
286	}
287	else {
288		unsigned long args[] = { addr, len, prot, 0, 0, 0 };
289
290		ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
291				       data, done);
292	}
293
294	return ret;
295}