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authorRich Felker <dalias@aerifal.cx>2012-11-16 22:22:34 -0500
committerRich Felker <dalias@aerifal.cx>2012-11-16 22:22:34 -0500
commita4db94ab78db29eddc957879251f3e0bc7ffb571 (patch)
tree400b05bdf99da781434c588eb56e40baef733ad6 /arch/powerpc
parent7718e7cce5730265f2707fe378ec263b4c35624d (diff)
downloadmusl-a4db94ab78db29eddc957879251f3e0bc7ffb571.tar.gz
musl-a4db94ab78db29eddc957879251f3e0bc7ffb571.tar.xz
musl-a4db94ab78db29eddc957879251f3e0bc7ffb571.zip
dynamic linking support for powerpc
incomplete but at least partly working. requires all files to be
compiled in the new "secure" plt model, not the old one that put plt
code in the data segment. TLS is untested but may work. invoking the
dynamic linker explicitly to load a program does not yet handle argv
correctly.
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/reloc.h35
1 files changed, 27 insertions, 8 deletions
diff --git a/arch/powerpc/reloc.h b/arch/powerpc/reloc.h
index 58e482d6..113dfa15 100644
--- a/arch/powerpc/reloc.h
+++ b/arch/powerpc/reloc.h
@@ -16,21 +16,40 @@ static inline void do_single_reloc(
 	switch(type) {
 	case R_PPC_GLOB_DAT:
 	case R_PPC_JMP_SLOT:
-		*reloc_addr = sym_val;
-		break;
-	case R_PPC_REL32:
-		if (sym_val) *reloc_addr += sym_val;
-		else *reloc_addr += (size_t)base_addr;
+	case R_PPC_ADDR32:
+		*reloc_addr = sym_val + addend;
 		break;
 	case R_PPC_COPY:
 		memcpy(reloc_addr, (void *)sym_val, sym_size);
 		break;
 	case R_PPC_RELATIVE:
-		*reloc_addr += (size_t)base_addr;
+		*reloc_addr = (size_t)base_addr + addend;
 		break;
-	//case R_PPC64_DTPMOD64:  //R_X86_64_DTPMOD64:
-	case R_PPC_DTPMOD32:  //R_386_TLS_DTPMOD32:
+	case R_PPC_DTPMOD32:
 		*reloc_addr = def.dso ? def.dso->tls_id : self->tls_id;
 		break;
+	case R_PPC_DTPREL32:
+		*reloc_addr = def.sym->st_value + addend;
+		break;
+	case R_PPC_TPREL32:
+		*reloc_addr += def.sym
+			? def.sym->st_value + def.dso->tls_offset - 0x7000
+			: self->tls_offset - 0x7000;
+		break;
 	}
 }
+
+void __reloc_self(int c, size_t *a, size_t *dynv)
+{
+	char *base;
+	size_t t[20], n;
+	for (a+=c+1; *a; a++);
+	for (a++; *a; a+=2) if (*a<20) t[*a] = a[1];
+	base = (char *)t[AT_BASE];
+	if (!base) base = (char *)(t[AT_PHDR] & -4096);
+	for (a=dynv; *a; a+=2) if (*a<20) t[*a] = a[1];
+	n = t[DT_RELASZ];
+	for (a=(void *)(base+t[DT_RELA]); n; a+=3, n-=12)
+		if (a[1]%256 == R_PPC_RELATIVE)
+			*(size_t *)(base+a[0]) = (size_t)base + a[2];
+}