implement symbol parsing

src/relf/relf.c

@@ -253,6 +253,61 @@ relf_value_t relf_open(relf_t* relf, const char* path)
         }
     }
 
+    // load symbol info
+    relf->symbol_num = symtab->f_size / symtab->entsize;
+    relf->symbols = (relf_symbol_t*)calloc(sizeof(relf_symbol_t), relf->symbol_num);
+
+    if (relf->type == RELF_64BIT)
+    {
+        for (unsigned i = 0; i < relf->symbol_num; i++)
+        {
+            const Elf64_Sym* hdr = (const Elf64_Sym*)((char*)relf->image
+                + symtab->f_offset + i*symtab->entsize);
+            relf_symbol_t* symbol = &relf->symbols[i];
+
+            if (hdr->st_name)
+                symbol->name = (const char*)relf->image + strtab->f_offset + hdr->st_name;
+            else symbol->name = NULL;
+
+            symbol->value = hdr->st_value;
+            symbol->size = hdr->st_size;
+
+            symbol->info = hdr->st_info;
+            symbol->other = hdr->st_other;
+
+            if (hdr->st_shndx < relf->section_num)
+                symbol->section = &relf->sections[hdr->st_shndx];
+            else symbol->section = NULL;
+
+            TRACE_SYMBOL(symbol);
+        }
+    }
+    else
+    {
+        for (unsigned i = 0; i < relf->symbol_num; i++)
+        {
+            const Elf32_Sym* hdr = (const Elf32_Sym*)((char*)relf->image
+                + symtab->f_offset + i*symtab->entsize);
+            relf_symbol_t* symbol = &relf->symbols[i];
+
+            if (hdr->st_name)
+                symbol->name = (const char*)relf->image + strtab->f_offset + hdr->st_name;
+            else symbol->name = NULL;
+
+            symbol->value = hdr->st_value;
+            symbol->size = hdr->st_size;
+
+            symbol->info = hdr->st_info;
+            symbol->other = hdr->st_other;
+
+            if (hdr->st_shndx < relf->section_num)
+                symbol->section = &relf->sections[hdr->st_shndx];
+            else symbol->section = NULL;
+
+            TRACE_SYMBOL(symbol);
+        }
+    }
+    
     return RELF_ERROR(RELF_OK);
 }
 
@@ -261,4 +316,5 @@ void relf_close(relf_t* relf)
     relf_unmap(relf);
     free(relf->segments);
     free(relf->sections);
+    free(relf->symbols);
 }

src/relf/relf.h

@@ -75,6 +75,19 @@ typedef struct {
     uint64_t entsize;
 } relf_section_t;
 
+// ELF symbol
+typedef struct {
+    const char* name;
+    
+    uint64_t value;
+    uint64_t size;
+
+    unsigned info;
+    unsigned other;
+
+    const relf_section_t* section;
+} relf_symbol_t;
+
 // relf instance
 typedef struct {
     void* image;
@@ -88,6 +101,9 @@ typedef struct {
 
     relf_section_t* sections;
     unsigned section_num;
+
+    relf_symbol_t* symbols;
+    unsigned symbol_num;
 } relf_t;
 
 // opens ELF file, checks ELF magic and maps it into memory

src/relf/relf_debug.h

@@ -20,9 +20,17 @@
         section->link, section->info,                                                                               \
         section->entsize                                                                                            \
     )
+
+#define TRACE_SYMBOL(symbol)                                                                                        \
+    TRACE("symbol name %s value 0x%lx size %lu info %x other %x\n",                                                 \
+        symbol->name,                                                                                               \
+        symbol->value, symbol->size,                                                                                \
+        symbol->info, symbol->other                                                                                 \
+    )
 #else
 #define TRACE_SEGMENT(segment)
 #define TRACE_SECTION(section)
+#define TRACE_SYMBOL(symbol)
 #endif
 
 #endif