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TOMOYO Linux Cross Reference
Linux/arch/x86/entry/vdso/vdso2c.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * This file is included twice from vdso2c.c.  It generates code for 32-bit
  4  * and 64-bit vDSOs.  We need both for 64-bit builds, since 32-bit vDSOs
  5  * are built for 32-bit userspace.
  6  */
  7 
  8 static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
  9                          void *stripped_addr, size_t stripped_len,
 10                          FILE *outfile, const char *name)
 11 {
 12         int found_load = 0;
 13         unsigned long load_size = -1;  /* Work around bogus warning */
 14         unsigned long mapping_size;
 15         ELF(Ehdr) *hdr = (ELF(Ehdr) *)raw_addr;
 16         int i;
 17         unsigned long j;
 18         ELF(Shdr) *symtab_hdr = NULL, *strtab_hdr, *secstrings_hdr,
 19                 *alt_sec = NULL;
 20         ELF(Dyn) *dyn = 0, *dyn_end = 0;
 21         const char *secstrings;
 22         INT_BITS syms[NSYMS] = {};
 23 
 24         ELF(Phdr) *pt = (ELF(Phdr) *)(raw_addr + GET_LE(&hdr->e_phoff));
 25 
 26         if (GET_LE(&hdr->e_type) != ET_DYN)
 27                 fail("input is not a shared object\n");
 28 
 29         /* Walk the segment table. */
 30         for (i = 0; i < GET_LE(&hdr->e_phnum); i++) {
 31                 if (GET_LE(&pt[i].p_type) == PT_LOAD) {
 32                         if (found_load)
 33                                 fail("multiple PT_LOAD segs\n");
 34 
 35                         if (GET_LE(&pt[i].p_offset) != 0 ||
 36                             GET_LE(&pt[i].p_vaddr) != 0)
 37                                 fail("PT_LOAD in wrong place\n");
 38 
 39                         if (GET_LE(&pt[i].p_memsz) != GET_LE(&pt[i].p_filesz))
 40                                 fail("cannot handle memsz != filesz\n");
 41 
 42                         load_size = GET_LE(&pt[i].p_memsz);
 43                         found_load = 1;
 44                 } else if (GET_LE(&pt[i].p_type) == PT_DYNAMIC) {
 45                         dyn = raw_addr + GET_LE(&pt[i].p_offset);
 46                         dyn_end = raw_addr + GET_LE(&pt[i].p_offset) +
 47                                 GET_LE(&pt[i].p_memsz);
 48                 }
 49         }
 50         if (!found_load)
 51                 fail("no PT_LOAD seg\n");
 52 
 53         if (stripped_len < load_size)
 54                 fail("stripped input is too short\n");
 55 
 56         if (!dyn)
 57                 fail("input has no PT_DYNAMIC section -- your toolchain is buggy\n");
 58 
 59         /* Walk the dynamic table */
 60         for (i = 0; dyn + i < dyn_end &&
 61                      GET_LE(&dyn[i].d_tag) != DT_NULL; i++) {
 62                 typeof(dyn[i].d_tag) tag = GET_LE(&dyn[i].d_tag);
 63                 if (tag == DT_REL || tag == DT_RELSZ || tag == DT_RELA ||
 64                     tag == DT_RELENT || tag == DT_TEXTREL)
 65                         fail("vdso image contains dynamic relocations\n");
 66         }
 67 
 68         /* Walk the section table */
 69         secstrings_hdr = raw_addr + GET_LE(&hdr->e_shoff) +
 70                 GET_LE(&hdr->e_shentsize)*GET_LE(&hdr->e_shstrndx);
 71         secstrings = raw_addr + GET_LE(&secstrings_hdr->sh_offset);
 72         for (i = 0; i < GET_LE(&hdr->e_shnum); i++) {
 73                 ELF(Shdr) *sh = raw_addr + GET_LE(&hdr->e_shoff) +
 74                         GET_LE(&hdr->e_shentsize) * i;
 75                 if (GET_LE(&sh->sh_type) == SHT_SYMTAB)
 76                         symtab_hdr = sh;
 77 
 78                 if (!strcmp(secstrings + GET_LE(&sh->sh_name),
 79                             ".altinstructions"))
 80                         alt_sec = sh;
 81         }
 82 
 83         if (!symtab_hdr)
 84                 fail("no symbol table\n");
 85 
 86         strtab_hdr = raw_addr + GET_LE(&hdr->e_shoff) +
 87                 GET_LE(&hdr->e_shentsize) * GET_LE(&symtab_hdr->sh_link);
 88 
 89         /* Walk the symbol table */
 90         for (i = 0;
 91              i < GET_LE(&symtab_hdr->sh_size) / GET_LE(&symtab_hdr->sh_entsize);
 92              i++) {
 93                 int k;
 94                 ELF(Sym) *sym = raw_addr + GET_LE(&symtab_hdr->sh_offset) +
 95                         GET_LE(&symtab_hdr->sh_entsize) * i;
 96                 const char *name = raw_addr + GET_LE(&strtab_hdr->sh_offset) +
 97                         GET_LE(&sym->st_name);
 98 
 99                 for (k = 0; k < NSYMS; k++) {
100                         if (!strcmp(name, required_syms[k].name)) {
101                                 if (syms[k]) {
102                                         fail("duplicate symbol %s\n",
103                                              required_syms[k].name);
104                                 }
105 
106                                 /*
107                                  * Careful: we use negative addresses, but
108                                  * st_value is unsigned, so we rely
109                                  * on syms[k] being a signed type of the
110                                  * correct width.
111                                  */
112                                 syms[k] = GET_LE(&sym->st_value);
113                         }
114                 }
115         }
116 
117         /* Validate mapping addresses. */
118         for (i = 0; i < sizeof(special_pages) / sizeof(special_pages[0]); i++) {
119                 INT_BITS symval = syms[special_pages[i]];
120 
121                 if (!symval)
122                         continue;  /* The mapping isn't used; ignore it. */
123 
124                 if (symval % 4096)
125                         fail("%s must be a multiple of 4096\n",
126                              required_syms[i].name);
127                 if (symval + 4096 < syms[sym_vvar_start])
128                         fail("%s underruns vvar_start\n",
129                              required_syms[i].name);
130                 if (symval + 4096 > 0)
131                         fail("%s is on the wrong side of the vdso text\n",
132                              required_syms[i].name);
133         }
134         if (syms[sym_vvar_start] % 4096)
135                 fail("vvar_begin must be a multiple of 4096\n");
136 
137         if (!name) {
138                 fwrite(stripped_addr, stripped_len, 1, outfile);
139                 return;
140         }
141 
142         mapping_size = (stripped_len + 4095) / 4096 * 4096;
143 
144         fprintf(outfile, "/* AUTOMATICALLY GENERATED -- DO NOT EDIT */\n\n");
145         fprintf(outfile, "#include <linux/linkage.h>\n");
146         fprintf(outfile, "#include <asm/page_types.h>\n");
147         fprintf(outfile, "#include <asm/vdso.h>\n");
148         fprintf(outfile, "\n");
149         fprintf(outfile,
150                 "static unsigned char raw_data[%lu] __ro_after_init __aligned(PAGE_SIZE) = {",
151                 mapping_size);
152         for (j = 0; j < stripped_len; j++) {
153                 if (j % 10 == 0)
154                         fprintf(outfile, "\n\t");
155                 fprintf(outfile, "0x%02X, ",
156                         (int)((unsigned char *)stripped_addr)[j]);
157         }
158         fprintf(outfile, "\n};\n\n");
159 
160         fprintf(outfile, "const struct vdso_image %s = {\n", name);
161         fprintf(outfile, "\t.data = raw_data,\n");
162         fprintf(outfile, "\t.size = %lu,\n", mapping_size);
163         if (alt_sec) {
164                 fprintf(outfile, "\t.alt = %lu,\n",
165                         (unsigned long)GET_LE(&alt_sec->sh_offset));
166                 fprintf(outfile, "\t.alt_len = %lu,\n",
167                         (unsigned long)GET_LE(&alt_sec->sh_size));
168         }
169         for (i = 0; i < NSYMS; i++) {
170                 if (required_syms[i].export && syms[i])
171                         fprintf(outfile, "\t.sym_%s = %" PRIi64 ",\n",
172                                 required_syms[i].name, (int64_t)syms[i]);
173         }
174         fprintf(outfile, "};\n");
175 }
176 

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