Add a "fork" of musl as //fusl.

fusl/src/ldso/dl_iterate_phdr.c

+#ifndef SHARED
+
+#include <elf.h>
+#include <link.h>
+#include "libc.h"
+
+#define AUX_CNT 38
+
+int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
+{
+        unsigned char *p;
+        ElfW(Phdr) *phdr, *tls_phdr=0;
+        size_t base = 0;
+        size_t n;
+        struct dl_phdr_info info;
+        size_t i, aux[AUX_CNT];
+
+        for (i=0; libc.auxv[i]; i+=2)
+                if (libc.auxv[i]<AUX_CNT) aux[libc.auxv[i]] = libc.auxv[i+1];
+
+        for (p=(void *)aux[AT_PHDR],n=aux[AT_PHNUM]; n; n--,p+=aux[AT_PHENT]) {
+                phdr = (void *)p;
+                if (phdr->p_type == PT_PHDR)
+                        base = aux[AT_PHDR] - phdr->p_vaddr;
+                if (phdr->p_type == PT_TLS)
+                        tls_phdr = phdr;
+        }
+        info.dlpi_addr  = base;
+        info.dlpi_name  = "/proc/self/exe";
+        info.dlpi_phdr  = (void *)aux[AT_PHDR];
+        info.dlpi_phnum = aux[AT_PHNUM];
+        info.dlpi_adds  = 0;
+        info.dlpi_subs  = 0;
+        if (tls_phdr) {
+                info.dlpi_tls_modid = 1;
+                info.dlpi_tls_data = (void *)(base + tls_phdr->p_vaddr);
+        } else {
+                info.dlpi_tls_modid = 0;
+                info.dlpi_tls_data = 0;
+        }
+        return (callback)(&info, sizeof (info), data);
+}
+#endif