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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> | |
20 | #include <linux/elf.h> | |
21 | #include <asm/pgtable.h> | |
22 | #include <asm/pgalloc.h> | |
0707ad30 | 23 | #include <asm/sections.h> |
4a556f4f | 24 | #include <asm/vdso.h> |
0c1d1917 | 25 | #include <arch/sim.h> |
867e359b CM |
26 | |
27 | /* Notify a running simulator, if any, that an exec just occurred. */ | |
28 | static void sim_notify_exec(const char *binary_name) | |
29 | { | |
30 | unsigned char c; | |
31 | do { | |
32 | c = *binary_name++; | |
33 | __insn_mtspr(SPR_SIM_CONTROL, | |
34 | (SIM_CONTROL_OS_EXEC | |
35 | | (c << _SIM_CONTROL_OPERATOR_BITS))); | |
36 | ||
37 | } while (c); | |
38 | } | |
39 | ||
2dd8ad81 | 40 | static int notify_exec(struct mm_struct *mm) |
867e359b | 41 | { |
0c1d1917 CM |
42 | char *buf, *path; |
43 | struct vm_area_struct *vma; | |
2dd8ad81 | 44 | |
0c1d1917 CM |
45 | if (!sim_is_simulator()) |
46 | return 1; | |
47 | ||
48 | if (mm->exe_file == NULL) | |
49 | return 0; | |
50 | ||
51 | for (vma = current->mm->mmap; ; vma = vma->vm_next) { | |
52 | if (vma == NULL) | |
53 | return 0; | |
54 | if (vma->vm_file == mm->exe_file) | |
55 | break; | |
56 | } | |
57 | ||
58 | buf = (char *) __get_free_page(GFP_KERNEL); | |
59 | if (buf == NULL) | |
60 | return 0; | |
61 | ||
62 | path = d_path(&mm->exe_file->f_path, buf, PAGE_SIZE); | |
63 | if (IS_ERR(path)) { | |
64 | free_page((unsigned long)buf); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | /* | |
69 | * Notify simulator of an ET_DYN object so we know the load address. | |
70 | * The somewhat cryptic overuse of SIM_CONTROL_DLOPEN allows us | |
71 | * to be backward-compatible with older simulator releases. | |
72 | */ | |
73 | if (vma->vm_start == (ELF_ET_DYN_BASE & PAGE_MASK)) { | |
74 | char buf[64]; | |
75 | int i; | |
76 | ||
77 | snprintf(buf, sizeof(buf), "0x%lx:@", vma->vm_start); | |
78 | for (i = 0; ; ++i) { | |
79 | char c = buf[i]; | |
80 | __insn_mtspr(SPR_SIM_CONTROL, | |
81 | (SIM_CONTROL_DLOPEN | |
82 | | (c << _SIM_CONTROL_OPERATOR_BITS))); | |
83 | if (c == '\0') | |
84 | break; | |
867e359b CM |
85 | } |
86 | } | |
0c1d1917 CM |
87 | |
88 | sim_notify_exec(path); | |
89 | free_page((unsigned long)buf); | |
90 | return 1; | |
867e359b CM |
91 | } |
92 | ||
93 | /* Notify a running simulator, if any, that we loaded an interpreter. */ | |
94 | static void sim_notify_interp(unsigned long load_addr) | |
95 | { | |
96 | size_t i; | |
97 | for (i = 0; i < sizeof(load_addr); i++) { | |
98 | unsigned char c = load_addr >> (i * 8); | |
99 | __insn_mtspr(SPR_SIM_CONTROL, | |
100 | (SIM_CONTROL_OS_INTERP | |
101 | | (c << _SIM_CONTROL_OPERATOR_BITS))); | |
102 | } | |
103 | } | |
104 | ||
105 | ||
867e359b CM |
106 | int arch_setup_additional_pages(struct linux_binprm *bprm, |
107 | int executable_stack) | |
108 | { | |
109 | struct mm_struct *mm = current->mm; | |
867e359b CM |
110 | int retval = 0; |
111 | ||
2dd8ad81 KK |
112 | down_write(&mm->mmap_sem); |
113 | ||
867e359b CM |
114 | /* |
115 | * Notify the simulator that an exec just occurred. | |
116 | * If we can't find the filename of the mapping, just use | |
117 | * whatever was passed as the linux_binprm filename. | |
118 | */ | |
2dd8ad81 | 119 | if (!notify_exec(mm)) |
867e359b CM |
120 | sim_notify_exec(bprm->filename); |
121 | ||
4a556f4f | 122 | retval = setup_vdso_pages(); |
867e359b CM |
123 | |
124 | #ifndef __tilegx__ | |
125 | /* | |
126 | * Set up a user-interrupt mapping here; the user can't | |
127 | * create one themselves since it is above TASK_SIZE. | |
128 | * We make it unwritable by default, so the model for adding | |
129 | * interrupt vectors always involves an mprotect. | |
130 | */ | |
131 | if (!retval) { | |
132 | unsigned long addr = MEM_USER_INTRPT; | |
133 | addr = mmap_region(NULL, addr, INTRPT_SIZE, | |
867e359b CM |
134 | VM_READ|VM_EXEC| |
135 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 0); | |
136 | if (addr > (unsigned long) -PAGE_SIZE) | |
137 | retval = (int) addr; | |
138 | } | |
139 | #endif | |
140 | ||
141 | up_write(&mm->mmap_sem); | |
142 | ||
143 | return retval; | |
144 | } | |
145 | ||
146 | ||
147 | void elf_plat_init(struct pt_regs *regs, unsigned long load_addr) | |
148 | { | |
149 | /* Zero all registers. */ | |
150 | memset(regs, 0, sizeof(*regs)); | |
151 | ||
152 | /* Report the interpreter's load address. */ | |
153 | sim_notify_interp(load_addr); | |
154 | } |