libmach

1 files changed, 103 insertions, 0 deletions

diff --git a/src/libmach/symelf.c b/src/libmach/symelf.c
new file mode 100644
index 00000000..7babbd49
--- /dev/null
+++ b/src/libmach/symelf.c
@@ -0,0 +1,103 @@
+#include <u.h>
+#include <libc.h>
+#include <mach.h>
+#include "elf.h"
+
+static int
+elfsyminit(Fhdr *fp)
+{
+	int i, onlyundef;
+	Elf *elf;
+	Symbol sym;
+	ElfSym esym;
+	ElfProg *p;
+
+	elf = fp->elf;
+
+	onlyundef = fp->nsym > 0;
+	for(i=0; elfsym(elf, i, &esym) >= 0; i++){
+		if(esym.name == nil)
+			continue;
+		if(onlyundef && esym.shndx != ElfSymShnNone)
+			continue;
+		if(esym.type != ElfSymTypeObject && esym.type != ElfSymTypeFunc)
+			continue;
+		if(strchr(esym.name, '@'))
+			continue;
+		memset(&sym, 0, sizeof sym);
+		sym.name = esym.name;
+		sym.loc.type = LADDR;
+		sym.loc.addr = esym.value;
+		if(esym.size){
+			sym.hiloc.type = LADDR;
+			sym.hiloc.addr = esym.value+esym.size;
+		}
+		sym.fhdr = fp;
+		if(esym.type==ElfSymTypeObject){
+			sym.class = CDATA;
+			sym.type = 'D';
+			if(&elf->sect[esym.shndx] == elf->bss)
+				sym.type = 'B';
+		}else if(esym.type==ElfSymTypeFunc){
+			sym.class = CTEXT;
+			sym.type = 'T';
+		}
+		if(esym.shndx == ElfSymShnNone)
+			sym.type = 'U';
+		if(esym.bind==ElfSymBindLocal)
+			sym.type += 'a' - 'A';
+		addsym(fp, &sym);
+	}
+
+	for(i=0; i<elf->nprog; i++){
+		p = &elf->prog[i];
+		if(p->type != ElfProgDynamic)
+			continue;
+		memset(&sym, 0, sizeof sym);
+		sym.name = "_DYNAMIC";
+		sym.loc = locaddr(p->vaddr);
+		sym.hiloc = locaddr(p->vaddr+p->filesz);
+		sym.type = 'D';
+		sym.class = CDATA;
+		addsym(fp, &sym);
+	}
+	return 0;
+}
+
+int
+symelf(Fhdr *fhdr)
+{
+	int ret;
+
+	ret = -1;
+
+	/* try dwarf */
+	if(fhdr->dwarf){
+		if(machdebug)
+			fprint(2, "dwarf symbols...\n");
+		if(symdwarf(fhdr) < 0)
+			fprint(2, "initializing dwarf: %r");
+		else
+			ret = 0;
+	}
+
+	/* try stabs */
+	if(fhdr->stabs.stabbase){
+		if(machdebug)
+			fprint(2, "stabs symbols...\n");
+		if(symstabs(fhdr) < 0)
+			fprint(2, "initializing stabs: %r");
+		else
+			ret = 0;
+	}
+
+	if(machdebug)
+		fprint(2, "elf symbols...\n");
+
+	if(elfsyminit(fhdr) < 0)
+		fprint(2, "initializing elf: %r");
+	else
+		ret = 0;
+	return ret;
+}
+