1 | #include <elf.h>
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2 | #include <link.h>
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3 | #include "libc.h"
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4 |
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5 | #define AUX_CNT 38
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6 |
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7 | #ifndef __c2__
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8 | __attribute__((__weak__, __visibility__("hidden")))
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9 | #endif
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10 | extern const size_t _DYNAMIC[];
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11 |
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12 | static int static_dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
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13 | {
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14 | unsigned char *p;
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15 | ElfW(Phdr) *phdr, *tls_phdr=0;
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16 | size_t base = 0;
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17 | size_t n;
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18 | struct dl_phdr_info info;
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19 | size_t i, aux[AUX_CNT] = {0};
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20 |
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21 | for (i=0; libc.auxv[i]; i+=2)
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22 | if (libc.auxv[i]<AUX_CNT) aux[libc.auxv[i]] = libc.auxv[i+1];
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23 |
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24 | for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
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25 | phdr = (void *)p;
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26 | if (phdr->p_type == PT_PHDR)
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27 | base = aux[AT_PHDR] - phdr->p_vaddr;
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28 | if (phdr->p_type == PT_DYNAMIC && _DYNAMIC)
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29 | base = (size_t)_DYNAMIC - phdr->p_vaddr;
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30 | if (phdr->p_type == PT_TLS)
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31 | tls_phdr = phdr;
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32 | }
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33 | info.dlpi_addr = base;
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34 | info.dlpi_name = "/proc/self/exe";
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35 | info.dlpi_phdr = (void *)aux[AT_PHDR];
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36 | info.dlpi_phnum = aux[AT_PHNUM];
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37 | info.dlpi_adds = 0;
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38 | info.dlpi_subs = 0;
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39 | if (tls_phdr) {
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40 | info.dlpi_tls_modid = 1;
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41 | info.dlpi_tls_data = (void *)(base + tls_phdr->p_vaddr);
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42 | } else {
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43 | info.dlpi_tls_modid = 0;
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44 | info.dlpi_tls_data = 0;
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45 | }
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46 | return (callback)(&info, sizeof (info), data);
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47 | }
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48 |
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49 | weak_alias(static_dl_iterate_phdr, dl_iterate_phdr);
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