Commit | Line | Data |
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867e359b CM |
1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #include <linux/mm.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/binfmts.h> | |
18 | #include <linux/compat.h> | |
19 | #include <linux/mman.h> | |
5a3b4e80 | 20 | #include <linux/file.h> |
867e359b CM |
21 | #include <linux/elf.h> |
22 | #include <asm/pgtable.h> | |
23 | #include <asm/pgalloc.h> | |
0707ad30 | 24 | #include <asm/sections.h> |
4a556f4f | 25 | #include <asm/vdso.h> |
0c1d1917 | 26 | #include <arch/sim.h> |
867e359b CM |
27 | |
28 | /* Notify a running simulator, if any, that an exec just occurred. */ | |
29 | static void sim_notify_exec(const char *binary_name) | |
30 | { | |
31 | unsigned char c; | |
32 | do { | |
33 | c = *binary_name++; | |
34 | __insn_mtspr(SPR_SIM_CONTROL, | |
35 | (SIM_CONTROL_OS_EXEC | |
36 | | (c << _SIM_CONTROL_OPERATOR_BITS))); | |
37 | ||
38 | } while (c); | |
39 | } | |
40 | ||
2dd8ad81 | 41 | static int notify_exec(struct mm_struct *mm) |
867e359b | 42 | { |
5a3b4e80 | 43 | int ret = 0; |
0c1d1917 CM |
44 | char *buf, *path; |
45 | struct vm_area_struct *vma; | |
5a3b4e80 | 46 | struct file *exe_file; |
2dd8ad81 | 47 | |
0c1d1917 CM |
48 | if (!sim_is_simulator()) |
49 | return 1; | |
50 | ||
0c1d1917 CM |
51 | buf = (char *) __get_free_page(GFP_KERNEL); |
52 | if (buf == NULL) | |
53 | return 0; | |
54 | ||
5a3b4e80 DB |
55 | exe_file = get_mm_exe_file(mm); |
56 | if (exe_file == NULL) | |
57 | goto done_free; | |
58 | ||
9bf39ab2 | 59 | path = file_path(exe_file, buf, PAGE_SIZE); |
5a3b4e80 DB |
60 | if (IS_ERR(path)) |
61 | goto done_put; | |
62 | ||
63 | down_read(&mm->mmap_sem); | |
64 | for (vma = current->mm->mmap; ; vma = vma->vm_next) { | |
65 | if (vma == NULL) { | |
66 | up_read(&mm->mmap_sem); | |
67 | goto done_put; | |
68 | } | |
69 | if (vma->vm_file == exe_file) | |
70 | break; | |
0c1d1917 CM |
71 | } |
72 | ||
73 | /* | |
74 | * Notify simulator of an ET_DYN object so we know the load address. | |
75 | * The somewhat cryptic overuse of SIM_CONTROL_DLOPEN allows us | |
76 | * to be backward-compatible with older simulator releases. | |
77 | */ | |
78 | if (vma->vm_start == (ELF_ET_DYN_BASE & PAGE_MASK)) { | |
79 | char buf[64]; | |
80 | int i; | |
81 | ||
82 | snprintf(buf, sizeof(buf), "0x%lx:@", vma->vm_start); | |
83 | for (i = 0; ; ++i) { | |
84 | char c = buf[i]; | |
85 | __insn_mtspr(SPR_SIM_CONTROL, | |
86 | (SIM_CONTROL_DLOPEN | |
87 | | (c << _SIM_CONTROL_OPERATOR_BITS))); | |
5a3b4e80 DB |
88 | if (c == '\0') { |
89 | ret = 1; /* success */ | |
0c1d1917 | 90 | break; |
5a3b4e80 | 91 | } |
867e359b CM |
92 | } |
93 | } | |
5a3b4e80 | 94 | up_read(&mm->mmap_sem); |
0c1d1917 CM |
95 | |
96 | sim_notify_exec(path); | |
5a3b4e80 DB |
97 | done_put: |
98 | fput(exe_file); | |
99 | done_free: | |
0c1d1917 | 100 | free_page((unsigned long)buf); |
5a3b4e80 | 101 | return ret; |
867e359b CM |
102 | } |
103 | ||
104 | /* Notify a running simulator, if any, that we loaded an interpreter. */ | |
105 | static void sim_notify_interp(unsigned long load_addr) | |
106 | { | |
107 | size_t i; | |
108 | for (i = 0; i < sizeof(load_addr); i++) { | |
109 | unsigned char c = load_addr >> (i * 8); | |
110 | __insn_mtspr(SPR_SIM_CONTROL, | |
111 | (SIM_CONTROL_OS_INTERP | |
112 | | (c << _SIM_CONTROL_OPERATOR_BITS))); | |
113 | } | |
114 | } | |
115 | ||
116 | ||
867e359b CM |
117 | int arch_setup_additional_pages(struct linux_binprm *bprm, |
118 | int executable_stack) | |
119 | { | |
120 | struct mm_struct *mm = current->mm; | |
867e359b CM |
121 | int retval = 0; |
122 | ||
123 | /* | |
124 | * Notify the simulator that an exec just occurred. | |
125 | * If we can't find the filename of the mapping, just use | |
126 | * whatever was passed as the linux_binprm filename. | |
127 | */ | |
2dd8ad81 | 128 | if (!notify_exec(mm)) |
867e359b CM |
129 | sim_notify_exec(bprm->filename); |
130 | ||
5a3b4e80 DB |
131 | down_write(&mm->mmap_sem); |
132 | ||
4a556f4f | 133 | retval = setup_vdso_pages(); |
867e359b CM |
134 | |
135 | #ifndef __tilegx__ | |
136 | /* | |
137 | * Set up a user-interrupt mapping here; the user can't | |
138 | * create one themselves since it is above TASK_SIZE. | |
139 | * We make it unwritable by default, so the model for adding | |
140 | * interrupt vectors always involves an mprotect. | |
141 | */ | |
142 | if (!retval) { | |
143 | unsigned long addr = MEM_USER_INTRPT; | |
144 | addr = mmap_region(NULL, addr, INTRPT_SIZE, | |
867e359b CM |
145 | VM_READ|VM_EXEC| |
146 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 0); | |
147 | if (addr > (unsigned long) -PAGE_SIZE) | |
148 | retval = (int) addr; | |
149 | } | |
150 | #endif | |
151 | ||
152 | up_write(&mm->mmap_sem); | |
153 | ||
154 | return retval; | |
155 | } | |
156 | ||
157 | ||
158 | void elf_plat_init(struct pt_regs *regs, unsigned long load_addr) | |
159 | { | |
160 | /* Zero all registers. */ | |
161 | memset(regs, 0, sizeof(*regs)); | |
162 | ||
163 | /* Report the interpreter's load address. */ | |
164 | sim_notify_interp(load_addr); | |
165 | } |