1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*
* IA-32 ELF support.
*
* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
*
* 06/16/00 A. Mallick initialize csd/ssd/tssd/cflg for ia32_load_state
*/
#include <linux/config.h>
#include <linux/types.h>
#include <asm/signal.h>
#include <asm/ia32.h>
#define CONFIG_BINFMT_ELF32
/* Override some function names */
#undef start_thread
#define start_thread ia32_start_thread
#define elf_format elf32_format
#define init_elf_binfmt init_elf32_binfmt
#define exit_elf_binfmt exit_elf32_binfmt
#undef CONFIG_BINFMT_ELF
#ifdef CONFIG_BINFMT_ELF32
# define CONFIG_BINFMT_ELF CONFIG_BINFMT_ELF32
#endif
#undef CONFIG_BINFMT_ELF_MODULE
#ifdef CONFIG_BINFMT_ELF32_MODULE
# define CONFIG_BINFMT_ELF_MODULE CONFIG_BINFMT_ELF32_MODULE
#endif
extern void ia64_elf32_init(struct pt_regs *regs);
extern void put_dirty_page(struct task_struct * tsk, struct page *page, unsigned long address);
#define ELF_PLAT_INIT(_r) ia64_elf32_init(_r)
#define setup_arg_pages(bprm) ia32_setup_arg_pages(bprm)
#define elf_map elf_map32
/* Ugly but avoids duplication */
#include "../../../fs/binfmt_elf.c"
/* Global descriptor table */
unsigned long *ia32_gdt_table, *ia32_tss;
struct page *
put_shared_page(struct task_struct * tsk, struct page *page, unsigned long address)
{
pgd_t * pgd;
pmd_t * pmd;
pte_t * pte;
if (page_count(page) != 1)
printk("mem_map disagrees with %p at %08lx\n", (void *) page, address);
pgd = pgd_offset(tsk->mm, address);
pmd = pmd_alloc(pgd, address);
if (!pmd) {
__free_page(page);
force_sig(SIGKILL, tsk);
return 0;
}
pte = pte_alloc(pmd, address);
if (!pte) {
__free_page(page);
force_sig(SIGKILL, tsk);
return 0;
}
if (!pte_none(*pte)) {
pte_ERROR(*pte);
__free_page(page);
return 0;
}
flush_page_to_ram(page);
set_pte(pte, pte_mkwrite(mk_pte(page, PAGE_SHARED)));
/* no need for flush_tlb */
return page;
}
void ia64_elf32_init(struct pt_regs *regs)
{
int nr;
put_shared_page(current, virt_to_page(ia32_gdt_table), IA32_PAGE_OFFSET);
if (PAGE_SHIFT <= IA32_PAGE_SHIFT)
put_shared_page(current, virt_to_page(ia32_tss), IA32_PAGE_OFFSET + PAGE_SIZE);
nr = smp_processor_id();
/* Do all the IA-32 setup here */
current->thread.map_base = 0x40000000;
/* setup ia32 state for ia32_load_state */
current->thread.eflag = IA32_EFLAG;
current->thread.csd = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0xBL, 1L, 3L, 1L, 1L, 1L);
current->thread.ssd = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
current->thread.tssd = IA64_SEG_DESCRIPTOR(IA32_PAGE_OFFSET + PAGE_SIZE, 0x1FFFL, 0xBL,
1L, 3L, 1L, 1L, 1L);
/* CS descriptor */
__asm__("mov ar.csd = %0" : /* no outputs */
: "r" IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0xBL, 1L,
3L, 1L, 1L, 1L));
/* SS descriptor */
__asm__("mov ar.ssd = %0" : /* no outputs */
: "r" IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L,
3L, 1L, 1L, 1L));
/* EFLAGS */
__asm__("mov ar.eflag = %0" : /* no outputs */ : "r" (IA32_EFLAG));
/* Control registers */
__asm__("mov ar.fsr = %0"
: /* no outputs */
: "r" ((ulong)IA32_FSR_DEFAULT));
__asm__("mov ar.fcr = %0"
: /* no outputs */
: "r" ((ulong)IA32_FCR_DEFAULT));
__asm__("mov ar.fir = r0");
__asm__("mov ar.fdr = r0");
__asm__("mov %0=ar.k0 ;;" : "=r" (current->thread.old_iob));
__asm__("mov ar.k0=%0 ;;" :: "r"(IA32_IOBASE));
/* TSS */
__asm__("mov ar.k1 = %0"
: /* no outputs */
: "r" IA64_SEG_DESCRIPTOR(IA32_PAGE_OFFSET + PAGE_SIZE,
0x1FFFL, 0xBL, 1L,
3L, 1L, 1L, 1L));
/* Get the segment selectors right */
regs->r16 = (__USER_DS << 16) | (__USER_DS); /* ES == DS, GS, FS are zero */
regs->r17 = (_TSS(nr) << 48) | (_LDT(nr) << 32)
| (__USER_DS << 16) | __USER_CS;
/* Setup other segment descriptors - ESD, DSD, FSD, GSD */
regs->r24 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
regs->r27 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
regs->r28 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
regs->r29 = IA64_SEG_DESCRIPTOR(0L, 0xFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L);
/* Setup the LDT and GDT */
regs->r30 = ia32_gdt_table[_LDT(nr)];
regs->r31 = IA64_SEG_DESCRIPTOR(0xc0000000L, 0x400L, 0x3L, 1L, 3L,
1L, 1L, 1L);
/* Clear psr.ac */
regs->cr_ipsr &= ~IA64_PSR_AC;
regs->loadrs = 0;
/*
* According to the ABI %edx points to an `atexit' handler.
* Since we don't have one we'll set it to 0 and initialize
* all the other registers just to make things more deterministic,
* ala the i386 implementation.
*/
regs->r8 = 0; /* %eax */
regs->r11 = 0; /* %ebx */
regs->r9 = 0; /* %ecx */
regs->r10 = 0; /* %edx */
regs->r13 = 0; /* %ebp */
regs->r14 = 0; /* %esi */
regs->r15 = 0; /* %edi */
}
#undef STACK_TOP
#define STACK_TOP ((IA32_PAGE_OFFSET/3) * 2)
int ia32_setup_arg_pages(struct linux_binprm *bprm)
{
unsigned long stack_base;
struct vm_area_struct *mpnt;
int i;
stack_base = STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;
bprm->p += stack_base;
if (bprm->loader)
bprm->loader += stack_base;
bprm->exec += stack_base;
mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
if (!mpnt)
return -ENOMEM;
{
mpnt->vm_mm = current->mm;
mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
mpnt->vm_end = STACK_TOP;
mpnt->vm_page_prot = PAGE_COPY;
mpnt->vm_flags = VM_STACK_FLAGS;
mpnt->vm_ops = NULL;
mpnt->vm_pgoff = 0;
mpnt->vm_file = NULL;
mpnt->vm_private_data = 0;
insert_vm_struct(current->mm, mpnt);
current->mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
}
for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
if (bprm->page[i]) {
current->mm->rss++;
put_dirty_page(current,bprm->page[i],stack_base);
}
stack_base += PAGE_SIZE;
}
return 0;
}
static unsigned long
ia32_mm_addr(unsigned long addr)
{
struct vm_area_struct *vma;
if ((vma = find_vma(current->mm, addr)) == NULL)
return(ELF_PAGESTART(addr));
if (vma->vm_start > addr)
return(ELF_PAGESTART(addr));
return(ELF_PAGEALIGN(addr));
}
/*
* Normally we would do an `mmap' to map in the process's text section.
* This doesn't work with IA32 processes as the ELF file might specify
* a non page size aligned address. Instead we will just allocate
* memory and read the data in from the file. Slightly less efficient
* but it works.
*/
extern long ia32_do_mmap (struct file *filep, unsigned int len, unsigned int prot,
unsigned int flags, unsigned int fd, unsigned int offset);
static unsigned long
elf_map32 (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type)
{
unsigned long retval;
if (eppnt->p_memsz >= (1UL<<32) || addr > (1UL<<32) - eppnt->p_memsz)
return -EINVAL;
#if 1
set_brk(ia32_mm_addr(addr), addr + eppnt->p_memsz);
memset((char *) addr + eppnt->p_filesz, 0, eppnt->p_memsz - eppnt->p_filesz);
kernel_read(filep, eppnt->p_offset, (char *) addr, eppnt->p_filesz);
retval = (unsigned long) addr;
#else
/* doesn't work yet... */
# define IA32_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_EXEC_PAGESIZE-1))
# define IA32_PAGEOFFSET(_v) ((_v) & (ELF_EXEC_PAGESIZE-1))
# define IA32_PAGEALIGN(_v) (((_v) + ELF_EXEC_PAGESIZE - 1) & ~(ELF_EXEC_PAGESIZE - 1))
down(¤t->mm->mmap_sem);
retval = ia32_do_mmap(filep, IA32_PAGESTART(addr),
eppnt->p_filesz + IA32_PAGEOFFSET(eppnt->p_vaddr), prot, type,
eppnt->p_offset - IA32_PAGEOFFSET(eppnt->p_vaddr));
up(¤t->mm->mmap_sem);
#endif
return retval;
}
|
