nealef commented on code in PR #7202:
URL: https://github.com/apache/incubator-nuttx/pull/7202#discussion_r981863910
##########
libs/libc/modlib/modlib_bind.c:
##########
@@ -518,6 +518,228 @@ static int modlib_relocateadd(FAR struct module_s *modp,
return ret;
}
+/****************************************************************************
+ * Name: modlib_relocatedyn
+ *
+ * Description:
+ * Perform all relocations associated with a dynamic section.
+ *
+ * Returned Value:
+ * 0 (OK) is returned on success and a negated errno is returned on
+ * failure.
+ *
+ ****************************************************************************/
+
+static int modlib_relocatedyn(FAR struct module_s *modp,
+ FAR struct mod_loadinfo_s *loadinfo, int relidx)
+
+{
+ FAR Elf32_Shdr *shdr = &loadinfo->shdr[relidx];
+ FAR Elf32_Shdr *symhdr;
+ FAR Elf32_Dyn *dyn = NULL;
+ FAR Elf32_Rel *rels = NULL;
+ FAR Elf32_Rel *rel;
+ FAR Elf32_Sym *sym = NULL;
+ uintptr_t addr;
+ int ret;
+ int i, iRel, iSym;
+ struct {
+ int strOff; /* Offset to string table */
+ int symOff; /* Offset to symbol table */
+ int lSymTab; /* Size of symbol table */
+ int relEntSz; /* Size of relocation entry */
+ int relOff[2]; /* Offset to the relocation section */
+ int relSz[2]; /* Size of relocation table */
+#define I_REL 0
+#define I_PLT 1
+#define N_RELS 2
+ } relData;
+
+ dyn = lib_malloc(shdr->sh_size);
+ ret = modlib_read(loadinfo, (FAR uint8_t *) dyn, shdr->sh_size,
shdr->sh_offset);
+ if (ret < 0)
+ {
+ berr("Failed to read dynamic section header");
+ return ret;
+ }
+
+ rels = lib_malloc(CONFIG_MODLIB_RELOCATION_BUFFERCOUNT * sizeof(Elf32_Rel));
+ if (!rels)
+ {
+ berr("Failed to allocate memory for elf relocation rels\n");
+ lib_free(dyn);
+ return -ENOMEM;
+ }
+
+ memset((void *) &relData, 0, sizeof(relData));
+
+ for (i = 0; dyn[i].d_tag != DT_NULL; i++)
+ {
+ switch(dyn[i].d_tag)
+ {
+ case DT_REL :
+ relData.relOff[I_REL] = dyn[i].d_un.d_val;
+ break;
+ case DT_RELSZ :
+ relData.relSz[I_REL] = dyn[i].d_un.d_val;
+ break;
+ case DT_RELENT :
+ relData.relEntSz = dyn[i].d_un.d_val;
+ break;
+ case DT_SYMTAB :
+ relData.symOff = dyn[i].d_un.d_val;
+ break;
+ case DT_STRTAB :
+ relData.strOff = dyn[i].d_un.d_val;
+ break;
+ case DT_JMPREL :
+ relData.relOff[I_PLT] = dyn[i].d_un.d_val;
+ break;
+ case DT_PLTRELSZ :
+ relData.relSz[I_PLT] = dyn[i].d_un.d_val;
+ break;
+ }
+ }
+
+ symhdr = &loadinfo->shdr[loadinfo->dsymtabidx];
+ sym = lib_malloc(symhdr->sh_size);
+ if (!sym)
+ {
+ berr("Error obtaining storage for dynamic symbol table");
+ lib_free(rels);
+ lib_free(dyn);
+ return -ENOMEM;
+ }
+
+ ret = modlib_read(loadinfo, (uint8_t *) sym, symhdr->sh_size,
symhdr->sh_offset);
+ if (ret < 0)
+ {
+ berr("Error reading dynamic symbol table - %d", ret);
+ lib_free(sym);
+ lib_free(rels);
+ lib_free(dyn);
+ return ret;
+ }
+
+ relData.lSymTab = relData.strOff - relData.symOff;
+
+ for (iRel = 0; iRel < N_RELS; iRel++)
+ {
+ if (relData.relOff[iRel] == 0)
+ continue;
+
+ /* Examine each relocation in the .rel.* section.
+ */
Review Comment:
Fixed
##########
libs/libc/modlib/modlib_bind.c:
##########
@@ -518,6 +518,228 @@ static int modlib_relocateadd(FAR struct module_s *modp,
return ret;
}
+/****************************************************************************
+ * Name: modlib_relocatedyn
+ *
+ * Description:
+ * Perform all relocations associated with a dynamic section.
+ *
+ * Returned Value:
+ * 0 (OK) is returned on success and a negated errno is returned on
+ * failure.
+ *
+ ****************************************************************************/
+
+static int modlib_relocatedyn(FAR struct module_s *modp,
+ FAR struct mod_loadinfo_s *loadinfo, int relidx)
+
+{
+ FAR Elf32_Shdr *shdr = &loadinfo->shdr[relidx];
+ FAR Elf32_Shdr *symhdr;
+ FAR Elf32_Dyn *dyn = NULL;
+ FAR Elf32_Rel *rels = NULL;
+ FAR Elf32_Rel *rel;
+ FAR Elf32_Sym *sym = NULL;
+ uintptr_t addr;
+ int ret;
+ int i, iRel, iSym;
+ struct {
+ int strOff; /* Offset to string table */
+ int symOff; /* Offset to symbol table */
+ int lSymTab; /* Size of symbol table */
+ int relEntSz; /* Size of relocation entry */
+ int relOff[2]; /* Offset to the relocation section */
+ int relSz[2]; /* Size of relocation table */
+#define I_REL 0
+#define I_PLT 1
+#define N_RELS 2
+ } relData;
+
+ dyn = lib_malloc(shdr->sh_size);
+ ret = modlib_read(loadinfo, (FAR uint8_t *) dyn, shdr->sh_size,
shdr->sh_offset);
+ if (ret < 0)
+ {
+ berr("Failed to read dynamic section header");
+ return ret;
+ }
+
+ rels = lib_malloc(CONFIG_MODLIB_RELOCATION_BUFFERCOUNT * sizeof(Elf32_Rel));
+ if (!rels)
+ {
+ berr("Failed to allocate memory for elf relocation rels\n");
+ lib_free(dyn);
+ return -ENOMEM;
+ }
+
+ memset((void *) &relData, 0, sizeof(relData));
+
+ for (i = 0; dyn[i].d_tag != DT_NULL; i++)
+ {
+ switch(dyn[i].d_tag)
+ {
+ case DT_REL :
+ relData.relOff[I_REL] = dyn[i].d_un.d_val;
+ break;
+ case DT_RELSZ :
+ relData.relSz[I_REL] = dyn[i].d_un.d_val;
+ break;
+ case DT_RELENT :
+ relData.relEntSz = dyn[i].d_un.d_val;
+ break;
+ case DT_SYMTAB :
+ relData.symOff = dyn[i].d_un.d_val;
+ break;
+ case DT_STRTAB :
+ relData.strOff = dyn[i].d_un.d_val;
+ break;
+ case DT_JMPREL :
+ relData.relOff[I_PLT] = dyn[i].d_un.d_val;
+ break;
+ case DT_PLTRELSZ :
+ relData.relSz[I_PLT] = dyn[i].d_un.d_val;
+ break;
+ }
+ }
+
+ symhdr = &loadinfo->shdr[loadinfo->dsymtabidx];
+ sym = lib_malloc(symhdr->sh_size);
+ if (!sym)
+ {
+ berr("Error obtaining storage for dynamic symbol table");
+ lib_free(rels);
+ lib_free(dyn);
+ return -ENOMEM;
+ }
+
+ ret = modlib_read(loadinfo, (uint8_t *) sym, symhdr->sh_size,
symhdr->sh_offset);
+ if (ret < 0)
+ {
+ berr("Error reading dynamic symbol table - %d", ret);
+ lib_free(sym);
+ lib_free(rels);
+ lib_free(dyn);
+ return ret;
+ }
+
+ relData.lSymTab = relData.strOff - relData.symOff;
+
+ for (iRel = 0; iRel < N_RELS; iRel++)
+ {
+ if (relData.relOff[iRel] == 0)
+ continue;
Review Comment:
Fixed
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