forked from KolibriOS/kolibrios
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include "kosnet/dlfcn.h"
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#include "kosnet/kos32sys1.h"
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typedef struct {
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char *name;
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void *ptr;
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} KosExp;
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typedef struct {
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void **importNames;
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char * libraryName;
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} KosImp;
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static int __attribute__ ((stdcall)) dll_Load(KosImp *importTableEntry);
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static const char *__error;
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static int __attribute__ ((stdcall)) dll_Load(KosImp *importTableEntry) {
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for (; importTableEntry->importNames; importTableEntry++) {
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char libPath[256] = "/sys/lib/";
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KosExp *exports = NULL;
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void **libImports = importTableEntry->importNames;
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strcat(libPath, importTableEntry->libraryName);
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if (!(exports = dlopen(libPath, 0))) { return 1; }
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for (; *libImports; libImports++) {
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if (!(*libImports = dlsym(exports, *libImports))) { return 1; }
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}
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}
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/007908799/xsh/dlopen.html
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// Current implementation fully ignores "mode" parameter
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void *dlopen(const char *name, int mode) {
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KosExp *exports = NULL;
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// load library using syscall
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asm volatile ("int $0x40":"=a"(exports):"a"(68), "b"(19), "c"(name));
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if (!exports) {
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char libPath[256] = "/sys/lib/";
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strcat(libPath, name);
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asm volatile ("int $0x40":"=a"(exports):"a"(68), "b"(19), "c"(libPath));
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if (!exports) {
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__error = "Library not found in \"/sys/lib/\" nor current folder";
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return NULL;
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}
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}
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// call anything starting with "lib_"
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for (KosExp *export = exports; export->name; export++) {
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if (!memcmp(export->name, "lib_", 4)) {
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asm volatile (
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"call *%4" ::
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"a"(0),
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"b"(0),
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"c"(0),
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"d"(dll_Load),
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"r"(export->ptr));
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// was asm volatile ("call *%4" ::"a"(sysmalloc),"b"(sysfree),"c"(sysrealloc),"d"(dll_Load),"r"(export->ptr));
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}
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}
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return exports;
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}
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// https://pubs.opengroup.org/onlinepubs/007908799/xsh/dlsym.html
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void *dlsym(void *handle, const char *name) {
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KosExp *exp = handle;
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for (; exp->name; exp++) {
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if (!strcmp(exp->name, name)) {
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return exp->ptr;
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}
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}
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__error = "Symbol not found";
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return NULL;
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}
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// https://pubs.opengroup.org/onlinepubs/007908799/xsh/dlclose.html
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int dlclose(void *handle) {
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return 0;
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}
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// https://pubs.opengroup.org/onlinepubs/007908799/xsh/dlerror.html
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char *dlerror(void) {
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char *ret = __error ? strdup(__error) : NULL;
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__error = NULL;
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return ret;
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}
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